Power hand tool switch torque controller apparatus
OwnerDaniel D. Wittinventor
Life of this patent
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Abstract
This invention is for a trigger switch apparatus for a hand held electric drill and includes a control of the electric power to a drill for fast or slow rotation of the drill bit by moving a rheostat contact bridge over a rheostat coil section for control of the rotation speed of the drill bit, and further a leaf spring holds the trigger carriage stop shoulder onto the carriage, and on seizure, kick back or sudden torque of the drill bit there is a cut off of power and the switch reverts to an “off” or “open” position, which then requires re-setting of the switch to a “closed” or “on” position for re-actuating operation of the hand held electric drill.
Claims1
A power hand tool switch torque control apparatus in a hand held electric power drill, said switch torque control apparatus consisting of:
- a—trigger and a trigger extension rod attached to said trigger,
- b—a trigger extension rod extending into a carriage, and said carriage to reciprocate in a trigger housing,
- c—a coiled spring in said trigger housing and said coiled spring contacts a closed end of said trigger housing and the end of said carriage,
- d—a coiled trigger spring in said carriage, and said coiled trigger spring in said carriage extends from inner end of said carriage to a trigger spring stop on a trigger shaft,
- e—electric power line enters the electric power drill via one line to control current lead rheostat coil and another line of common current lead to electric motor drive,
- f—a rheostat contact bridge mounted on said carriage to contact said rheostat coil,
- g—a carriage extension catch mounted on said carriage and a carriage extension stop mounted on said trigger housing,
- h—a trigger carriage stop shoulder on a shaft from said trigger,
- i—a leaf spring mounted on said shaft from said trigger, and said leaf spring in contact with said carriage.
Dependencies are inferred from the claim text.