Power tool with device for preventing unintentional turn-on of d

Details Power tool with device for preventing unintentional turn-on of d Power tool with device for preventing unintentional turn-on of d

1975-11-12

1977-04-19

Purser, Ernest R.

Tool driving or impacting

Drive control operable by hand engaging manipulating handle

251109, B23B 4500

Patent

active

040182924

ABSTRACT:
The power tool has a drive motor and a turn-on switch device activatable for turning on the drive motor. A manual activator is mounted for swinging movement in a predetermined plane of motion and in a predetermined direction from a normal position to an activating position in which it activates the turn-on switch device. The manual activator is so arranged and configurated as to be depressible in the predetermined direction by a hand of the user of the power tool. A safety device prevents unintentional activator depression and includes a blocking structure. The blocking structure is mounted for swinging movement relative to the manual activator in generally the predetermined plane and in the predetermined direction from a blocking position in which it prevents activator depression to an unblocking position in which it permits such depression. The blocking structure is comprised of one or more cooperating levers and is so configurated and located relative to the manual activator as to be depressible by a finger of the same hand which depresses the manual activator.

REFERENCES:
patent: 1101464 (1914-06-01), McDonald
patent: 1205237 (1916-11-01), Maliha
patent: 1318120 (1919-10-01), Wheaton
patent: 1483467 (1924-02-01), Meden
patent: 1681044 (1928-08-01), Malik

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