Switch-brake interlock for chain saw

B - Operations – Transporting – 27 – G

Patent

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Details

143/7, 306/9

B27G 19/06 (2006.01) B27B 17/00 (2006.01) F16D 59/00 (2006.01)

Patent

CA 1139197

Title of the Invention SWITCH-BRAKE INTERLOCK FOR CHAIN SAW Abstract of the Disclosure A shut-off device (104) controlling the operation of the motive means such as an electric motor which powers a tool such as a chain saw (12) having a housing (14) with a brake (34) therein operative to stop the chain saw (12). The shut-off device (104) includes a switch (54) biased off and shiftable on. A pivotable or shiftable trigger (72) is shifted toward but remains out of contact with the switch (54). A link (92) is caused to shift responsive to the brake (34) when the brake becomes operative, but the link is otherwise disposed intermediate the switch (54) and the trigger (72) to permit the trigger (72) movement to actuate the switch (54). However, on brake actuation the link is removed from a path of motion between the switch (54) and trigger (72) thereby to restore the switch (54) to "off" position. Once the link (92) is removed from the path of motion it cannot be reinserted therein until after the trigger (72) is released. The housing (14) may include a fulcrum (66) and/or a post (68) to guide the link (92) movement. The link (92) may include a bend (102) to permit limited deflection thereof, or have a second link or holding member (112) positioning the link (92) responsive to the brake (34).

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