Power tool safety mechanism

Details Power tool safety mechanism Power tool safety mechanism

1976-05-05

1977-12-20

Hafer, Robert A.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

310 50, 310 68B, B23Q 5027

Patent

active

040636003

ABSTRACT:
In a portable motor driven tool such as a drill, a handle is connected to the housing in a manner permitting limited relative movement, in particular pivotal movement, between housing and handle. Biasing springs maintain the handle in a first position, and a normally-closed switch in series with the tool motor has an operator element engaging the handle. If the tool becomes stuck in a workpiece during operation, the sudden reverse force acting between the handle and housing overcomes the spring bias force causing relative movement between handle and housing to open the switch and break the motor electric circuit thereby preventing safety hazards and damage.

REFERENCES:
patent: 1751781 (1930-03-01), Weiss
patent: 3173417 (1965-03-01), Horner
patent: 3221192 (1965-11-01), Franklin
patent: 3854020 (1974-12-01), Glover et al.

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