US Patent No. 9,883,609

FILTER FAN WITH A QUICK FIXING DEVICE


Patent No. 9,883,609
Issue Date January 30, 2018
Title Filter Fan With A Quick Fixing Device
Inventorship Andreas Pfannenberg, Hamburg (DE)
Assignee PFANNENBERG GMBH, Hamburg (DE)

Claim of US Patent No. 9,883,609

1. A filter fan, comprising a basic casing with a rectangular frame having four side walls, wherein the frame is provided
with quick fixing devices formed by elastic snap-in elements provided as spring-elastic brackets for removable fixing of the
filter fan on a peripheral mounting edge of a cut out in a mounting wall of a switch cupboard, wherein said four side walls
are connected with each other so as to form the rectangular frame, wherein the four side walls are not disposed within a common
plane, wherein contact surfaces for contacting the mounting wall when the filter fan is fixed on the peripheral mounting edge
of the cut out in the mounting wall protrude from each side wall outwards at an angle of substantially 90°, wherein the contact
surface of each side wall is connected with a neighboring contact surface so as to form a continuous collar protruding from
said frame, wherein said four side walls of the frame and said collar each have a continuously closed outer peripheral surface,
wherein several plate-shaped blanks which form the snap-in elements are configured on the outer peripheral surface of the
side walls of the frame, each of said plate-shaped blanks being molded directly onto the outer peripheral surface of the side
walls of the frame and wherein each of the plate-shaped blanks is provided with a plurality of substantially parallel slits
for constituting a number of parallel spring-elastic snap-in tongues so that a snap-in connection to the peripheral mounting
edge of the cut out in the mounting wall can be established.