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US 4,223,744 AGranted
Reversing hammer drill
AssigneeThe Singer Company
InventorJames L. Lovingood
Life of this patent
Estimating the term…
Abstract
A hammer drill having a bypass switch which is activated by the selector ring to prevent the drill from operating in the hammer mode by shunting the reversing switch. This is a precaution to prevent damage to the clutch teeth which are designed for ratchet action when the tool is operated in the forward direction, but will lock down in reverse to stall tool or damage the mechanism. In the drill mode, the bypass switch connects the reversing switch in circuit with the on-off switch.
Claims5
A bypass switch assembly for a reversing hammer drill comprising:
- a. a housing,
- b. a motor journaled in the housing,
- c. a hammer drill mechanism selectively operable as a drill or as a hammer drill,
- d. a trigger switch in circuit with the motor to turn the motor on and off,
- e. a reversing switch adapted to set the motor for rotation in the forward or reverse direction, and
- f. a bypass switch in circuit between the motor and the trigger switch selectively to connect the reversing switch in circuit with the motor or to shunt the reversing switch.
3 more elements
Dependencies are inferred from the claim text.