Abstract A safety arrangement for a power tool having a tool holding chuck and a key with transversely disposed pinion and handle portions for tightening and loosening the chuck and having a control switch and an operating member therefor that is shifted between spaced positions corresponding to the on and off conditions respectively of the power tool, the combination of the tool casing having a slot adjacent the switch which slot is adapted to receive the key handle portion with the pinion portion then being exposed, a casing wall located adjacent the slot allowing rotation of the inserted key in one direction only, a leaf spring supported by the casing with a cantilevered portion located adjacent the positioned key handle portion and further having a tab formed on the spring and located adjacent the operation member, the spring tab operating under the normal bias of the spring when no key is in the unit to interfer with the operating member thereby precluding shifting of same from the off position to the on position, and the key handle portion operating when positioned in the slot and upon key rotation to displace the spring tab from interference with the operating member thereby allowing shifting of the operating member for desired operation of the power tool.
A safety arrangement for a power tool having a control switch and an operating member therefor that is shifted between spaced positions corresponding to the on and off conditions respectively of the power tool, the combination of a key member and the tool casing having a slot adjacent the switch which slot is adapted to receive a portion of the key member, casing wall means located adjacent the slot allowing rotation of the inserted key member in one direction only, a leaf spring supported by the casing with a cantilevered portion located adjacent the positioned key portion and further having a tab formed on the spring and located adjacent the operation member, the spring tab operating under the normal bias of the spring when no key is in the unit to interfere with the operating member thereby precluding shifting of same from the off position to the on position, and the key portion operating when positioned in the slot and upon keY rotation to displace the spring tab from interference with the operating member thereby allowing shifting of the operating member for desired operation of the power tool.
Claim 2
Dependent Claim
188 words
A safety arrangement for a power tool having a control switch and an operating member therefor that is shifted between spaced positions corresponding to the on and off conditions respectively of the power tool, the combination of a key member and the tool casing having a slot adjacent the switch which slot is adapted to receive a portion of the key member, casing wall means located adjacent the slot allowing rotation of the inserted key member in one direction only, a leaf spring supported by the casing with a cantilevered portion located adjacent the positioned key portion and further having a tab formed on the spring and located adjacent the operation member, the spring tab operating under the normal bias of the spring when no key is in the unit to interfere with the operating member thereby precluding shifting of same from the off position to the on position, and the key portion operating when positioned in the slot and upon keY rotation to displace the spring tab from interference with the operating member thereby allowing shifting of the operating member for desired operation of the power tool.
Claim 3
Dependent Claim
63 words
A power tool safety arrangement according to claim 1, wherein the tool member has a tool holding chuck and wherein the key member has transversely disposed pinion and handle portions for tightening and loosening the chuck, and wherein the key handle portion is adapted to be inserted into the slot with the key pinion portion then yet being exposed outside of the casing.
Claim 4
Dependent Claim
48 words
A power tool safety arrangement according to claim 1, further including additional casing wall means located adjacent the slot requiring a slight canting of the key member relative to the direction of insertion into the slot before the inserted key member can be rotated in the one direction.
Claim 5
Dependent Claim
46 words
A power tool safety arrangement according to claim 3, further including still additional casing wall means located adjacent the slot serving the dual purpose of slightly return canting the inserted and rotated key member and of detenting the inserted and rotated key member in said position.