Patent Model - Improvement in Screw-Drivers

Maker and role
George Loomis, Patentee
Production date
Feb 03 1874
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Object detail

Wood, iron
12 x 4 1/4 x 5 1/2" (30.5 x 10.8 x 14cm)
"In using this screw driver, the handle is at all times held firmly in the hand. A tooth of the pawl, catching in one of the recesses of the disk, turns the blade with a forward motion of the handle. With the backward movement of the handle the pawl slips over the projection on the disk, so that with the alternate forward and backward motions of the handle, the blade has only a forward movement. To turn the blade the other way, the projecting arm of the pawl is thrown to the other end of the slot, which brings the opposite tooth of the pawl in contact with the disk, and turns the blade with the backward motion of the hand." (Patent Number 147,059)
Object number
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