US Patent No. 9,093,843

ELECTRIC HAND-HELD POWER TOOL WITH A SHUT-OFF DELAY DEVICE


Patent No. 9,093,843
Issue Date July 28, 2015
Title Electric Hand-held Power Tool With A Shut-off Delay Device
Inventorship Bernd Wirnitzer, Friolzheim (DE)
Rainer Glauning, Aichtal-Groetzingen (DE)
Assignee Robert Bosch GmbH, Stuttgart (DE)

Claim of US Patent No. 9,093,843

1. An electric hand-held power tool comprising
at least one electrical drive,
at least one electrical device that requires electrical energy in order to operate, said at least one electrical device configured
as control electronics of said electric hand-held power tool,

a shut-off delay device for the electrical drive and/or the electrical device,
at least one rechargeable battery for supplying electrical energy to the drive and the electrical device, and
an exhaustive-discharge safeguard device (8), which, above a critical state of charge threshold, specifies the delay time (?t) of the shut-off delay device (3) as a function of the state of charge of the rechargeable battery (9) it has determined, and below a critical state of charge threshold, specifies the delay time (?t) to be zero.