Power-driven drill and screwdriver

Details Power-driven drill and screwdriver Power-driven drill and screwdriver

1977-06-15

1979-07-17

Herrmann, Allan D.

192 clutches and power-stop control

Clutches

Automatic

144 32R, 192 67R, 192 93R, 192114R, B23B 2100, F16D 1100

Patent

active

041612426

ABSTRACT:
A power-driven drill and screwdriver includes a housing and a drive motor mounted in the housing. A case is attached to the housing and has a spindle bearing mounted therein. A first clutch is rotatably mounted in the case axially of the bearing and is operatively connected to the drive motor. An output spindle is journalled in the bearing and has a flange formed thereon. A second clutch is formed on the flange so as to be adjacent the first clutch. The output spindle is slideably mounted in the bearing so as to cause the second clutch to be movable relative to the first clutch between a first location whereat the second clutch firmly engages the first clutch and a second location whereat second clutch is disengaged from the first clutch. A spring resiliently biases the second clutch into the second location. An eccentric member is journalled in the case and is rotatable from one position corresponding to the screwdriving mode of the tool to another position corresponding to the drill mode of the tool. The eccentric member is arranged in the case with respect to the second clutch to counteract the urging force of the spring and to displace the second clutch into the first location when the eccentric member is rotated from one position to the other position. A handle is attached to the eccentric member at the outside wall surface of the case for manually rotating the eccentric member between the two positions. A first detent and a second detent coact with a detent member in the handle for defining the respective positions of the handle. The handle is connected to the eccentric member so as to cause the first detent to correspond to one of the positions and the second detent to correspond to the other one of the positions.

REFERENCES:
patent: 1865022 (1932-06-01), Larson
patent: 2485878 (1949-10-01), Hanlon
patent: 2857997 (1958-10-01), Graybill
patent: 3178955 (1965-04-01), Enders et al.
patent: 3396557 (1968-08-01), Moores, Jr.
patent: 3934688 (1976-01-01), Sides et al.

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