US Pat. No. 9,273,433

METHOD AND APPARATUS FOR CONTROLLING DUST EMISSIONS WITH TEMPERATURE CONTROL

Roadtec, Inc., Chattanoo...

1. A method for operating a working machine which includes:
(a) a drive engine that produces engine exhaust gases;
(b) a milling drum that is mounted for rotation against a road surface thereby generating milled material including dust from
the road surface;

(c) an enclosed space within which said milled material is contained;
(d) a spray assembly for directing water in such a manner that, during a period of rotation of the milling drum against the
surface of the road, at least a portion of the water is converted to a vapor which is contained within the enclosed space;

(e) an exhaust stack for engine exhaust gases;
(f) a conduit for conducting at least a portion of the engine exhaust gases into the enclosed space;
(g) an exhaust metering valve that is adapted to selectively direct the engine exhaust gases into the conduit for conducting
at least a portion of the engine exhaust gases into the enclosed space and/or to the exhaust stack;

(h) a controller that is adapted to operate the exhaust metering valve to control the flow of engine exhaust gases into the
enclosed space;

said method comprising:
(i) operating the controller to conduct at least a portion of the engine exhaust gases into the enclosed space to heat the
gas stream therein containing vapor and dust from the milled material to a temperature above its dew point.

US Pat. No. 9,109,333

HOPPER INSERT FOR ASPHALT PAVING MACHINE

Roadtec, Inc., Chattanoo...

1. A hopper insert that is adapted to be installed in the hopper of a paving machine above a hopper conveyor that conveys
asphalt material in a hopper conveying direction, said hopper insert:
(a) having a front end and a rear end;
(b) comprising:
(i) an upper portion that includes a plurality of generally vertically oriented upper walls;
(ii) a generally funnel-shaped lower portion which includes a plurality of lower walls, each of which is associated with and
extends downwardly from an upper wall, wherein a plurality of the lower walls are angled with respect to their associated
upper walls;

wherein the upper walls and the lower walls together define an opening into the hopper conveyor therebelow, said opening increasing
in width from the front end of the hopper insert to the rear end.

US Pat. No. 9,506,204

HOPPER BAFFLE ASSEMBLY FOR ASPHALT PAVING MACHINE

Roadtec, Inc., Chattanoo...

1. An asphalt receiving hopper for an asphalt paving machine comprising:
(a) a left sidewall;
(b) a right sidewall;
(c) a front wall;
(d) a left baffle panel that is resiliently attached to the left sidewall and adapted to extend into the asphalt receiving
hopper;

(e) a right baffle panel that is resiliently attached to the right sidewall and adapted to extend into the asphalt receiving
hopper wherein said baffle panels are configured to contact a dump body of a dump truck when asphalt material is added into
the hopper.

US Pat. No. 9,505,567

AUTOMATIC BAFFLE CONTROL FOR TRUCK-RECEIVING HOPPER OF MATERIAL TRANSFER VEHICLE

Roadtec, Inc., Chattanoo...

1. A material transfer vehicle comprising:
(a) a truck-receiving hopper that is adapted to receive asphalt material from a truck;
(b) a truck-unloading conveyor that is adapted to receive asphalt material from the truck-receiving hopper, said truck-unloading
conveyor having an entry end that includes a hopper opening adjacent to the truck-receiving hopper;

(c) a drive system for the truck-unloading conveyor that includes an engine and a hydraulic circuit;
(d) a system for automatically controlling the flow of asphalt material from the truck-receiving hopper into the entry end
of the truck-unloading conveyor in order to optimize at least one vehicle operating parameter selected from the group consisting
of the hydraulic pressure in the hydraulic circuit of the drive system and the speed of the engine in the drive system, said
system comprising:

(i) a baffle that is mounted to the truck-receiving hopper adjacent to the entry end of the truck-unloading conveyor and adapted
to increase or decrease the hopper opening into the truck-unloading conveyor;

(ii) a controller that is operatively connected to the baffle and adapted to cause the baffle to increase or decrease the
hopper opening into the truck-unloading conveyor;

(iii) a sensor for directly detecting the at least one vehicle operating parameter, said sensor being operatively connected
to the controller so that changes in the at least one vehicle operating parameter can be communicated to the controller;

wherein the controller is adapted to control the flow rate of asphalt material into the hopper opening of the truck-unloading
conveyor in order to optimize the at least one vehicle operating parameter.

US Pat. No. 10,017,905

SCREED ASSEMBLY FOR ASPHALT PAVING MACHINE

Roadtec, Inc., Chattanoo...

1. A screed assembly for an asphalt paving machine comprising:(a) a lower screed plate;
(b) an upper screed plate;
(c) a heating element that is in contact with the lower screed plate;
(d) a compression bolt assembly comprising:
(i) a primary bolt having a primary bolt through hole;
(ii) a compression bolt that is adapted to be inserted through the primary bolt through hole;
(iii) a compression spring that is adapted to be placed over the lower end of the primary bolt;
wherein said compression bolt assembly is adapted to cooperate with the upper screed plate to apply a compression force to the heating element on the lower screed plate.

US Pat. No. 9,956,917

ACCESS STAIRWAY FOR MATERIAL TRANSFER VEHICLE

Roadtec, Inc., Chattanoo...

1. A material transfer vehicle comprising:(a) a frame having a frame longitudinal axis;
(b) an operator's platform that is mounted on the frame;
(c) a conveyor:
(i) having an upper side and a conveyor longitudinal axis;
(ii) which is mounted on the frame;
(iii) which is located adjacent to and below the operator's platform;
(iv) which is adapted to be moved between a working position in which the conveyor longitudinal axis forms a working angle with the frame longitudinal axis and a travel position in which the conveyor longitudinal axis forms a travel angle with the frame longitudinal axis;
(d) an access stairway to the operator's station comprising:
(i) a side stair portion; and
(ii) a conveyor step that is mounted on the upper side of the conveyor, said conveyor step being mounted so as to be generally horizontal when the conveyor is in its working position.

US Pat. No. 9,708,779

MATERIAL TRANSFER VEHICLE HAVING AN EXPANDABLE TRUCK-RECEIVING HOPPER

Roadtec, Inc., Chattanoo...

1. A material transfer vehicle comprising a truck-receiving hopper that is adapted to receive asphalt material from a truck,
said truck-receiving hopper including:
(a) an expandable front portion comprising:
(i) a right expandable sidewall assembly having a right outer front sidewall panel and means for moving the right outer front
sidewall panel between an inner right position and an outer right position;

(ii) a left expandable sidewall assembly having a left outer front sidewall panel and means for moving the left outer front
sidewall panel between an inner left position and an outer left position;

(b) a rear portion having a right sidewall panel and a left sidewall panel, which right and left sidewall panels are fixed
against movement with respect to each other.

US Pat. No. 9,507,348

AUTO-CALIBRATION OF AUTOMATIC GRADE CONTROL SYSTEM IN A WORKING MACHINE

Roadtec, Inc., Chattanoo...

1. A calibration system for an automatic attitude control system for a working machine having a frame, a left side linear
actuator that is actuated by a left side electrically operated valve for adjusting the attitude of the frame of the machine,
and a right side linear actuator that is actuated by a right side electrically operated valve for adjusting the attitude of
the frame of the machine, said automatic control system comprising a controller for automatically actuating the left side
linear actuator and/or the right side linear actuator of the working machine to maintain a predetermined attitude of the frame,
said calibration system comprising:
(a) at least one sensor that is adapted to determine if the actuation of either the left side linear actuator or the right
side linear actuator has caused a change in the attitude of the frame of the machine;

(b) a calibrating controller that is:
(i) operatively connected to the at least one sensor;
(ii) operatively connected to the left side electrically operated valve;
(iii) adapted to cause one or more sequential electrical currents to be sent to the left side electrically operated valve,
to determine based on input from the at least one sensor if any such electrical current has caused a change in the attitude
of the frame of the machine, and to determine a left side sequence count of the number of times that an electrical current
that was caused to be sent to the left side electrically operated valve failed to cause a change in the attitude of the frame
of the machine;

(iv) adapted to initiate a left side calibration sequence by causing a predetermined minimum electrical current to be sent
to the left side electrically operated valve;

(v) adapted to continue the left side calibration sequence, if the previous electrical current sent to the left side electrically
operated valve in the left side calibration sequence did not cause a change in the attitude of the frame of the machine, by
causing a subsequent electrical current that is larger than the predetermined minimum electrical current by an increment that
is equal to a predetermined incremental electrical current value multiplied by the left side sequence count to be sent to
the left side electrically operated valve;

(vi) adapted to communicate to the automatic attitude control system a left side electrical current set point equal to the
amount of electrical current that was sent to the left side electrically operated valve which was determined by input from
the at least one sensor to cause a change in the attitude of the frame of the machine;

(vii) operatively connected to the right side electrically operated valve;
(viii) adapted to cause one or more sequential electrical currents to be sent to the right side electrically operated valve,
to determine based on input from the at least one sensor if any such electrical current has caused a change in the attitude
of the frame of the machine, and to determine a right side sequence count of the number of times that an electrical current
that was caused to be sent to the right side electrically operated valve failed to cause a change in the attitude of the frame
of the machine;

(ix) adapted to initiate a right side calibration sequence by causing a predetermined minimum electrical current to be sent
to the right side electrically operated valve;

(x) adapted to continue the right side calibration sequence, if the previous electrical current sent to the right side electrically
operated valve in the right side calibration sequence did not cause a change in the attitude of the frame of the machine,
by causing a subsequent electrical current that is larger than the predetermined minimum electrical current by an increment
that is equal to a predetermined incremental electrical current value multiplied by the right side sequence count to be sent
to the right side electrically operated valve;

(xi) adapted to communicate to the automatic attitude control system a right side electrical current set point equal to the
amount of electrical current that was sent to the right side electrically operated valve which was determined by input from
the at least one sensor to cause a change in the attitude of the frame of the machine.

US Pat. No. 10,060,085

SPRAY ASSEMBLY FOR A WORKING MACHINE EMPLOYING DIRECT ACTING VALVES

Roadtec, Inc., Chattanoo...

1. A spray assembly for a working machine that includes a fluid storage tank and is adapted for operation on a roadway, said spray assembly being in fluid communication with the fluid storage tank and further comprising:(a) a plurality of nozzle assemblies, each of which comprises a direct acting valve;
(b) a controller that is operatively connected to each of the direct acting valves for controlling the opening and closing thereof;
(c) a selector that is operatively connected to the controller, which selector may be employed by an operator of the working machine to selectively operate one or more of the direct acting valves in order to provide a desired spray pattern of fluid from the fluid storage tank onto the roadway;
wherein each of the direct acting valves is a direct acting poppet valve that is enabled by a linear solenoid;
(d) which includes a support beam that is attached to a frame of the working machine;
(e) which includes a power source for the controller;
(f) wherein each of the nozzle assemblies:
(i) is mounted on the support beam;
(ii) includes a solenoid switch assembly and a valve assembly;
(g) wherein the controller comprises:
(i) a spray control;
(ii) an input module that is operatively connected to the solenoid switch assembly of each nozzle assembly and to the spray control, said input module being adapted to determine if the valve assembly of each nozzle assembly is open or closed;
(iii) an output module that is operatively connected to the spray assembly and to the power source, said output module being adapted to energize the solenoid switch assembly of each nozzle assembly in the spray assembly.

US Pat. No. 9,951,484

POSITIONING ASSEMBLY FOR PLACING STEERABLE DRIVE IN MULTIPLE POSITIONS WITH RESPECT TO MILLING MACHINE HOUSING

Roadtec, Inc., Chattanoo...

1. A milling machine for milling a surface of a roadway, said milling machine comprising:(A) a frame;
(B) a housing;
(C) a milling drum mounted on the frame within the housing;
(D) a drive assembly comprising a drive mechanism;
(E) a positioning assembly for moving the drive assembly between a first drive assembly position which is laterally outside the housing and a second drive assembly position which is laterally inside the housing, said positioning assembly comprising:
(1) a frame portion that is attached to the frame, said frame portion comprising:
(a) a first frame locking component that is associated with the first drive assembly position for the drive assembly;
(b) a second frame locking component that is associated with the second drive assembly position for the drive assembly;
(c) a vertical pivot pin;
(2) a pivot assembly that is pivotally mounted on the pivot pin of the frame portion and is adapted to move vertically on the pivot pin, said pivot assembly further comprising:
(a) an elevating actuator that is adapted to move the drive mechanism, between a contact position on the surface on which the machine is placed for operation and a non-contact position that is off the surface on which the machine is placed for operation;
(b) a pivot locking component that is adapted to cooperate with the first frame locking component of the frame portion and alternatively with the second frame locking component of the frame portion;
(c) a locking actuator that is adapted to move the pivot assembly vertically on the pivot pin of the frame portion between a locking elevation and an unlocking elevation;
(3) a positioning actuator that is adapted to pivot the pivot assembly on the pivot pin with respect to the frame portion between a first pivot position in which the first frame locking component of the frame portion is aligned with the pivot locking component and a second pivot position in which the second frame locking component is aligned with the pivot locking component;
wherein the positioning assembly is configured and arranged so that:
(F) the drive assembly is in the first drive assembly position when the first frame locking component is aligned with the pivot locking component; and
(G) actuation of the locking actuator to move the pivot assembly from the unlocking elevation to the locking elevation when the first frame locking component is aligned with the pivot locking component will lock the pivot assembly to the frame portion with the drive assembly in the first drive assembly position; and
(H) actuation of the locking actuator to move the pivot assembly from the locking elevation to the unlocking elevation when the first frame locking component is aligned with the pivot locking component will unlock the pivot assembly from the frame portion with the drive assembly in the first drive assembly position; and
(I) the drive assembly is in the second drive assembly position when the second frame locking component is aligned with the pivot locking component; and
(J) actuation of the locking actuator to move the pivot assembly from the unlocking elevation to the locking elevation when the second frame locking component is aligned with the pivot locking component will lock the pivot assembly to the frame portion with the drive assembly in the second drive assembly position; and
(K) actuation of the locking actuator to move the pivot assembly from the locking elevation to the unlocking elevation when the second frame locking component is aligned with the pivot locking component will unlock the pivot assembly from the frame portion with the drive assembly in the second drive assembly position.

US Pat. No. 10,329,724

SWEEPING MACHINE WITH SIDE LOADING BROOM

Roadtec, Inc., Chattanoo...

1. A vehicular sweeping machine comprising:(a) a frame;
(b) means for driving the vehicular sweeping machine in a forward sweeping direction;
(c) a broom assembly that is mounted to the frame, said broom assembly comprising:
(i) a broom enclosure;
(ii) a left hub mount arm having a left hub mounted thereto, said left hub having an inner broom engaging portion on the inside of the left hub mount arm;
(iii) a right hub mount arm having a right hub mounted thereto, said right hub having an inner broom engaging portion on the inside of the right hub mount arm;
(iv) a broom that is mounted between the inner broom engaging portion of the left hub and the inner broom engaging portion of the right hub, said broom comprising a generally cylindrical tube with attached bristles that is adapted to rotate about a generally horizontal axis;
(v) an outer tube that is attached to the rear of the broom enclosure and to one of the left and right hub mount arms;
(vi) an inner tube having a fixed end that is attached to the left or right hub mount arm to which the outer tube is not attached, said inner tube also having a free end that is adapted to slide within the outer tube;
(vii) a linear actuator that is attached between the broom enclosure and the left or right hub mount arm to which the fixed end of the inner tube is attached, said linear actuator being adapted to move the hub mount arm to which it is attached between an inner position in which the broom is engaged with the inner broom engaging portion of the left hub and the inner broom engaging portion of the right hub and an outer position in which the broom is disengaged from one or both of the inner broom engaging portion of the left hub and the inner broom engaging portion of the right hub;
(d) a broom conveyor having a lower end that is disposed within the broom enclosure.

US Pat. No. 10,246,836

COLD IN-PLACE RECYCLING WITH IN-LINE HEATER FOR ASPHALT CEMENT

Roadtec, Inc., Chattanoo...

1. A CIR train that is adapted to traverse a roadway of asphalt pavement in order to recycle and repair the asphalt paving material comprising the asphalt pavement, said CIR train comprising:(a) a milling machine for milling the asphalt paving material and removing said asphalt paving material from the roadway;
(b) a vehicle comprising an asphalt cement supply tank;
(c) a mechanism for dispensing asphalt cement onto asphalt paving material that has been removed from the roadway;
(d) a heater that is in fluid communication with the asphalt cement supply tank and the mechanism for dispensing asphalt cement on the asphalt paving material that has been removed from the roadway, said heater:
(i) being adapted to heat the asphalt cement from the asphalt cement supply tank prior to said asphalt cement being dispensed on the asphalt paving material that has been removed from the roadway;
(ii) comprising a burner assembly that burns fuel in air to create hot gases of combustion;
(iii) including a first heating chamber that includes a plurality of fluid passages through which asphalt cement may pass, which fluid passages are contacted by the hot gases of combustion from the burner assembly;
(iv) including a second heating chamber that is disposed around the first heating chamber.

US Pat. No. 10,113,276

COLD IN-PLACE RECYCLING MACHINE WITH SURGE TANK

Roadtec, Inc., Chattanoo...

1. A CIR-modified milling machine comprising:(a) a milling drum that is adapted to mill material from a roadway;
(b) a milling drum housing that contains the milling drum;
(c) an additive spray assembly that is located within the milling drum housing and adapted to dispense an asphalt additive therein;
(d) an additive flow system:
(i) which includes an inlet pipe that is adapted to be operatively connected to an external supply line;
(ii) comprising a surge tank for asphalt additive that is in fluid communication with the additive spray assembly;
(iii) comprising an additive pump for pumping asphalt additive from the surge tank to the additive spray assembly;
wherein the additive flow system includes piping and associated valves that permit operation of the additive flow system in a first mode in which the additive pump is adapted to draw asphalt additive from an external supply into the surge tank by means of the external supply line, and to pump the asphalt additive out of the surge tank to the additive spray assembly, and alternatively in a second mode in which the additive pump is adapted to draw asphalt additive from an external supply by means of the external supply line and to pump the asphalt additive out to the additive spray assembly while bypassing the surge tank.

US Pat. No. 10,246,833

ASPHALT PAVING MACHINE OPERATIONAL REPORTING SYSTEM

Roadtec, Inc., Chattanoo...

1. An asphalt paving machine comprising:(a) a drive system that is operated to move the paving machine across a surface to be paved;
(b) an asphalt receiving hopper which is adapted to receive asphalt paving material;
(c) a distributing auger;
(d) a hopper conveyor that is adapted to transport the asphalt paving material from the asphalt receiving hopper to the distributing auger, said hopper conveyor comprising:
(i) a hopper conveyor motor;
(ii) a speed sensor that is associated with the hopper conveyor motor and adapted to measure the rate of rotation of the hopper conveyor motor;
(e) a vertically-adjustable flow gate that is associated with the hopper conveyor and adapted to define the size of the gate opening from the asphalt receiving hopper to the distributing auger, said flow gate further comprising a flow gate position sensor that is adapted to determine the vertical position of the flow gate;
(f) a controller including a timer, said controller being:
(i) operatively connected to the drive system for moving the paving machine across the surface to be paved and adapted to receive a machine speed signal indicating the speed at which the paving machine is moving across the surface to be paved;
(ii) operatively connected to the speed sensor that is associated with the hopper conveyor motor and adapted to receive a conveyor speed signal indicating the speed of the hopper conveyor;
(iii) operatively connected to the flow gate position sensor and adapted to receive a flow gate signal indicating the vertical position of the flow gate;
(iv) adapted to use the machine speed signal, the conveyor speed signal and the flow gate signal to measure the amount of asphalt paving material delivered to the distributing auger per unit of time;
(g) a material sensor that is attached to the vertically-adjustable flow gate, said material sensor:
(i) being operatively connected to the controller and adapted to signal to the controller if asphalt paving material is passing under the flow gate;
(ii) having an arm that extends below the bottom of the flow gate, said arm being adapted to pivot upwardly when asphalt paving material is struck off by the flow gate;
(iii) having a switch that is configured to be actuated when the arm of the material sensor pivots upwardly in order to signal the controller that asphalt paving material is passing under the flow gate.

US Pat. No. 10,214,364

SYSTEM FOR TRACKING OPERATING TIME FOR CONVEYOR OF WORKING MACHINE

Roadtec, Inc., Chattanoo...

1. A working machine for conducting a roadworking operation, said machine comprising:(a) a conveyor that is adapted to move roadworking material as a part of a roadworking operation;
(b) a sensor which is adapted to determine if a condition exists that is indicative of the conveyor's operating under a load;
(c) a controller which:
(i) is adapted to receive input information including a predetermined operating run-time for a wear part that is associated with the conveyor;
(ii) is adapted to receive a signal from the sensor that a condition exists which is indicative of the conveyor's operating under load;
(iii) includes a timer that is adapted to use the signal received from the sensor to measure a period of time during which the conveyor is operating under load;
(iv) is adapted to compare the measured period of time that the conveyor is operating under load with the predetermined operating run-time for the wear part, and if the measured time matches the predetermined operating run-time, to signal the operator that the wear part should be inspected for possible replacement, or replaced.

US Pat. No. 10,487,462

METHOD AND APPARATUS FOR SPREADING CHIPS ON ROADWAY

Roadtec, Inc., Chattanoo...

1. A chip sealing train for use in carrying out a chip sealing operation on a roadway, said chip sealing train comprising:a) a chip supply dump truck having a front end and a rear end, and further comprising a dump bed that is adapted to carry stone chips, said dump bed being adapted to be raised so that stone chips carried therein will slide out of the dump bed;
b) an asphalt composition supply truck that is adapted to carry an asphalt composition, said asphalt composition supply truck having a front end, a rear end, and an outlet line through which the asphalt composition may be discharged;
c) a self-propelled modified chip spreader which:
i. has a front end;
ii. has a rear end;
iii. is adapted to be driven along the roadway with the front end leading in a chip spreading direction;
iv. includes a receiving hopper on the front end for receiving the stone chips from the raised dump bed of the chip supply dump truck;
v. includes a spreader assembly comprising a spreader hopper on the rear end, which spreader assembly is adapted to dispense the stone chips through the spreader hopper onto the roadway;
vi. includes a conveyor assembly for conveying the stone chips from the receiving hopper to the spreader assembly;
vii. includes a spray assembly that is in fluid communication with the outlet line of the asphalt composition supply truck and is adapted to dispense the asphalt composition received from the asphalt composition supply truck onto the surface of the roadway in front of the spreader assembly.

US Pat. No. 10,655,286

SYSTEM FOR ANTICIPATING A KICK-BACK EVENT DURING OPERATION OF MILLING MACHINE

Roadtec, Inc., Chattanoo...

1. A milling machine for milling a roadway surface, said milling machine having a milling machine weight and further comprising:(a) a frame;
(b) a milling assembly comprising:
(i) a drum housing that is attached to the frame;
(ii) a milling drum that is mounted within the milling drum housing and adapted for rotation about a substantially horizontal axis;
(iii) a primary drum drive assembly that is operatively attached to the milling drum and adapted to rotate the milling drum;
(c) a ground-engaging drive assembly that is adapted to drive the milling machine along the roadway surface;
(d) a lifting column that is attached at its upper end to the frame and at its lower end to the ground-engaging drive assembly, said lifting column including:
(i) an outer leg tube which is fixed to the frame and which has a top bracket with an upper surface;
(ii) a linear actuator which can be operated to raise and lower the frame of the machine with respect to the roadway surface;
(e) a load cell sensor that is:
(i) mounted to a bracket on the upper surface of the top bracket of the outer leg tube of the lifting column in such a manner that the load cell sensor is spaced away from the upper surface of the top bracket of the outer leg tube and does not rotate or otherwise move with respect to the frame as the lifting column or the ground-engaging drive assembly is operated;
(ii) adapted to determine if the lifting column is not supporting at least a predetermined portion of the weight of the milling machine;
(iii) adapted to generate a signal indicating that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine;
(f) a controller that is:
(i) operatively attached to the primary drum drive assembly;
(ii) adapted to control the primary drum drive assembly in order to stop the rotation of the milling drum;
(iii) operatively attached to the load cell sensor;
(iv) adapted to receive the signal indicating that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine;
(v) adapted to stop the rotation of the milling drum when the signal received from the sensor indicates that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine.

US Pat. No. 10,480,135

COLD IN-PLACE RECYCLING WITH HEATING ASSEMBLY INCLUDING A HEATER FOR ASPHALT CEMENT AND A HEAT-MODIFYING COMPONENT

Roadtec, Inc., Chattanoo...

1. A CIR train that is adapted to traverse a roadway of pavement in order to remove paving material from the pavement and recycle such paving material by mixing it with asphalt cement, said CIR train comprising:(A) a milling machine for milling the pavement and removing milled paving material from the roadway;
(B) an asphalt cement supply tank that is separate from the milling machine;
(C) a mechanism for dispensing asphalt cement onto paving material that has been removed from the roadway by the milling machine;
(D) an asphalt cement flow circuit that provides for the flow of asphalt cement from the asphalt cement supply tank to the mechanism for dispensing asphalt cement onto the paving material that has been removed from the roadway, said asphalt cement flow circuit including an asphalt cement pump for pumping asphalt cement from the asphalt cement supply tank into and through the asphalt cement flow circuit;
(E) a heating assembly that is interposed in the asphalt cement flow circuit between the asphalt cement supply tank and the mechanism for dispensing asphalt cement onto paving material that has been removed from the roadway, said heating assembly comprising:
(i) a heater comprising:
(a) an asphalt cement coil that is in the asphalt cement flow circuit;
(b) a burner that is adapted to direct hot gases of combustion across the asphalt cement coil through which asphalt cement is being pumped;
(ii) a heat modifying component that is adapted to modulate the amount of heat transfer from the hot gases of combustion to the asphalt cement in the coil in order to control the temperature of the asphalt cement in the asphalt cement flow circuit downstream of the heating assembly, wherein the heat modifying component modulates the amount of heat transfer from the hot gases of combustion to the asphalt cement in the coil by modifying the flow of asphalt cement through the asphalt cement coil or by modifying the flow of hot gases of combustion from the burner of the heater across the asphalt cement coil.

US Pat. No. 10,407,846

COMBINATION DOOR/PLATFORM FOR MAINTENANCE ACCESS FOR CONVEYOR OF MATERIAL TRANSFER VEHICLE

Roadtec, Inc., Chattanoo...

1. A material transfer vehicle comprising:(a) a material receiving device that is adapted to receive asphalt paving material;
(b) a receiving conveyor that is operatively attached to the material receiving device, said receiving conveyor:
(i) comprising a chain drive assembly that includes a chain tension adjustment assembly;
(ii) being pivotable about a substantially horizontal axis so that it can be moved between a transport configuration in which the material receiving device is raised, an intermediate adjustment configuration, and a working configuration in which the material receiving device is lowered;
(c) a housing structure that encloses protected components and includes an opening adjacent to the protected components;
(d) a combination door and platform that is attached to the housing structure and is adapted to be moved between a closed configuration that covers the opening and an open configuration that provides:
(i) access to the protected components;
(ii) a platform on which an operator can stand to access the chain tension adjustment assembly.

US Pat. No. 10,337,153

QUICK-CHANGE ATTACHMENT FOR MATERIAL TRANSFER VEHICLE

Roadtec, Inc., Chattanoo...

1. A material transfer vehicle comprising:(a) a loading conveyor including:
(i) a lower end with a right side and a left side;
(ii) a transverse auger at the lower end of the loading conveyor, said transverse auger having a right end and a left end;
(iii) a right guide plate on the right side of the lower end, said right guide plate supporting the right end of the transverse auger;
(iv) a left guide plate on the left side of the lower end, said left guide plate supporting the left end of the transverse auger;
(b) a loading component that is adapted to be removably attached to the lower end of the loading conveyor, said loading component including:
(i) a right guide bracket that is adapted to align with and engage the right guide plate of the loading conveyor;
(ii) a left guide bracket that is adapted to align with and engage the left guide plate of the loading conveyor.

US Pat. No. 10,633,809

ADJUSTABLE-WIDTH MODULAR BROOM ASSEMBLY FOR SWEEPING MACHINE

Roadtec, Inc., Chattanoo...

1. A modular broom assembly for a vehicular sweeping machine that is adapted to rotate a broom about a substantially horizontal axis to sweep material into a broom conveyor of fixed width, said modular broom assembly being adapted to accommodate a broom of a first length and a broom of a second length that is longer than the first length, said modular broom assembly further comprising:(a) a primary broom enclosure that is adapted to accommodate the broom of the first length;
(b) an extension assembly that includes broom extension components that are adapted to be installed on the primary broom enclosure:
(i) to increase the width of the primary broom enclosure to accommodate the broom of the second length; and
(ii) to direct material swept by the broom of the second length into the broom conveyor.

US Pat. No. 10,246,835

METHOD AND APPARATUS FOR SPREADING CHIPS ON ROADWAY USING FOAMED ASPHALT CEMENT

Roadtec, Inc., Chattanoo...

1. A chip sealing train for use in carrying out a chip sealing operation on a roadway, said chip sealing train comprising:(a) a chip supply dump truck having a front end and a rear end, and further comprising a dump bed that is adapted to carry stone chips, said dump bed being adapted to be raised so that stone chips carried therein will slide out of the dump bed;
(b) an asphalt cement supply truck that is adapted to carry liquid asphalt cement, said asphalt cement supply truck comprising an asphalt cement supply tank;
(c) a chip spreader which:
(i) includes a receiving hopper for receiving the stone chips from the raised dump bed of the chip supply dump truck;
(ii) includes a spreader assembly which is adapted to dispense the stone chips onto the roadway;
(iii) includes a conveyor assembly for conveying the stone chips from the receiving hopper to the spreader assembly;
(d) a water tank;
(e) a foam dispersal assembly comprising:
(i) a foaming chamber;
(ii) an asphalt cement supply line that is in fluid communication with the asphalt cement supply tank and the foaming chamber;
(iii) an asphalt cement pump for pumping asphalt cement from the asphalt cement supply tank into the foaming chamber;
(iv) a water supply line that is in fluid communication with the water tank and the foaming chamber;
(v) a water pump for pumping water from the water tank into the foaming chamber;
(vi) a spray bar that is adapted to dispense foamed asphalt cement from the foaming chamber onto the surface of the roadway in front of the spreader assembly.

US Pat. No. 10,640,933

MILLING MACHINE HAVING AUTOMATIC GRADE CONTROL SYSTEM

Roadtec, Inc., Chattanoo...

6. A method for operating a milling machine comprising:(a) a frame;
(b) a milling assembly comprising a drum housing having a right side and a left side and being attached to the frame, said housing including:
(i) a right end gate having a front end and a rear end and being attached to the right side of the housing, said right end gate being adapted to be moved vertically with respect to the housing;
(ii) a right front elevation sensor that is attached to the right end gate and is adapted to determine an elevation of the front end of the right end gate with respect to the frame of the milling machine;
(iii) a right rear elevation sensor that is attached to the right end gate and is adapted to determine an elevation of the rear end of the right end gate with respect to the frame of the milling machine;
(iv) a left end gate having a front end and a rear end and being attached to the left side of the housing, said left end gate being adapted to be moved vertically with respect to the housing;
(v) a left front elevation sensor that is attached to the left end gate and is adapted to determine an elevation of the front end of the left end gate with respect to the frame of the milling machine;
(vi) a left rear elevation sensor that is attached to the left end gate and is adapted to determine an elevation of the rear end of the left end gate with respect to the frame of the milling machine;
(c) a right front lifting column that is attached at its upper end to the frame and at its lower end to a right front drive assembly, said right front lifting column including a right front linear actuator which can be operated to raise and lower the frame of the machine with respect to the roadway surface;
(d) a left front lifting column that is attached at its upper end to the frame and at its lower end to a left front drive assembly, said left front lifting column including a left front linear actuator which can be operated to raise and lower the frame with respect to the roadway surface;
(e) a rear lifting column that is attached at its upper end to the frame and at its lower end to a rear drive assembly, said rear lifting column including a rear linear actuator which can be operated to raise and lower the frame of the machine with respect to the roadway surface;
(f) a controller that is:
(i) operatively attached to the right front elevation sensor and is adapted to receive a right front end gate signal indicative of the elevation of the front end of the right end gate with respect to the roadway surface;
(ii) operatively attached to the right rear elevation sensor and is adapted to receive a right rear end gate signal indicative of the elevation of the rear end of the right end gate with respect to the roadway surface;
(iii) operatively attached to the left front elevation sensor and is adapted to receive a left front end gate signal indicative of the elevation of the front end of the left end gate with respect to the roadway surface;
(iv) operatively attached to the left rear elevation sensor and is adapted to receive a left rear end gate signal indicative of the elevation of the rear end of the left end gate with respect to the roadway surface;
(v) operatively attached to the right front linear actuator of the right front lifting column and is adapted to control the elevation of the right front lifting column with respect to the roadway surface;
(vi) operatively attached to the left front linear actuator of the left front lifting column and is adapted to control the elevation of the left front lifting column with respect to the roadway surface;
(vii) operatively attached to the rear linear actuator of the rear lifting column and is adapted to control the elevation of the rear lifting column with respect to the roadway surface;
(viii) adapted to receive a side selection signal from the operator selecting either the left side or the right side of the milling machine;
(ix) adapted to receive a cut depth signal from the operator selecting a desired cut depth;
(x) adapted to determine an actual right front cut depth on the right side of the milling machine using the right front end gate signal;
(xi) adapted to determine an actual right rear cut depth on the right side of the milling machine using the right rear end gate signal;
(xii) adapted to determine an actual left front cut depth on the left side of the milling machine using the left front end gate signal;
(xiii) adapted to determine an actual left rear cut depth on the left side of the milling machine using the left rear end gate signal;
(xiv) adapted to control the linear actuator in the front lifting column on the side that is not selected by the operator by averaging the actual front cut depth and the actual rear cut depth on the un-selected side of the machine and using this average to adjust the elevation of the front lifting column on the un-selected side to maintain the desired cut depth;
(xv) adapted to control the linear actuator in the front lifting column on the selected side by using the actual front cut depth of the selected side of the machine to adjust the elevation of the front lifting column on the selected side to maintain the desired cut depth;
(xvi) adapted to control the linear actuator in the rear lifting column by using the actual rear cut depth of the selected side of the machine to adjust the elevation of the rear lifting column to maintain the desired cut depth;
said method comprising:
(g) selecting a desired cut depth and communicating the desired cut depth to the controller;
(h) selecting either the right side of the milling machine or the left side of the milling machine;
(i) operating the controller to control the linear actuator in the front lifting column on the side that is not selected by the operator by averaging the actual front cut depth and the actual rear cut depth on the un-selected side of the machine and using this average to adjust the elevation of the front lifting column on the un-selected side to maintain the desired cut depth;
(j) operating the controller to control the linear actuator in the front lifting column on the selected side by using the actual front cut depth of the selected side of the machine to adjust the elevation of the front lifting column on the selected side to maintain the desired cut depth;
(k) operating the controller to control the linear actuator in the rear lifting column by using the actual rear cut depth of the selected side of the machine to adjust the elevation of the rear lifting column to maintain the desired cut depth.

US Pat. No. 10,577,759

DRIVE BELT DISENGAGEMENT FOR CUTTER DRUM OF MILLING MACHINE AND AUXILIARY DRUM DRIVE ASSEMBLY

Roadtec, Inc., Chattanoo...

1. A milling machine for milling a surface of a roadway, said milling machine comprising:(a) a frame;
(b) a milling assembly comprising a cutter drum that is mounted for rotation with respect to the frame, said cutter drum having a drive shaft on which a sheave is mounted;
(c) a primary drum drive assembly that is adapted to rotate the cutter drum with respect to the frame, said primary drum drive assembly including a drive belt that cooperates with the sheave on the drive shaft for the cutter drum to rotate the cutter drum;
(d) a belt lift assembly that may be operated to selectively disengage the drive belt from the sheave of the drive shaft for the cutter drum by interposing a belt lifter between the sheave of the drive shaft for the cutter drum and the drive belt.