Dual mode rotary power tool with adjustable output torque

Details Dual mode rotary power tool with adjustable output torque Dual mode rotary power tool with adjustable output torque

1990-01-09

1991-06-25

Lorence, Richard

192 clutches and power-stop control

Clutches

Operators

192 34, 192 56R, 192 93A, 192 67R, 173 13, 173 29, 81475, B23B 4500, B25B 23159, F16D 1114

Patent

active

050259032

ABSTRACT:
In an electrically powered combination screwdriver/drill opposing halves of a ratchet type torque tranmsitting clutch are normally biased axially apart by a compression spring. The output half of the clutch is fixed on the output spindle of the tool which is free to move axially within limits. For screwdriving operation, operator bias of the tool against the workpiece overcomes the spring, retracting the output spindle and bringing the clutch halves into engagement. An adjustable stop in the nose of the tool limits axially rearward movement of the output spindle and hence depth of engagement of the clutch teeth, thus providing a variable limit on torque transmitted. For the drilling mode, the rearward half of the clutch is cammed forward so that the clutch is firmly engaged for continuous rotation of the output spindle without specific torque limitation. An operator may switch from drilling mode to screwdriving mode and back without disturbing the torque limit adjustment of the screwdriving mode.

REFERENCES:
patent: 1699870 (1929-01-01), Black et al.
patent: 2857997 (1958-10-01), Graybill
patent: 2884103 (1959-04-01), Connell
patent: 2950626 (1960-08-01), Short
patent: 3454143 (1969-07-01), Beam et al.
patent: 3834252 (1974-09-01), Abell et al.
patent: 3955628 (1976-05-01), Grozinger et al.
patent: 4158970 (1979-06-01), Laughon
patent: 4159050 (1979-06-01), Hopkins, Sr. et al.
patent: 4161242 (1979-07-01), Moores, Jr. et al.
patent: 4823885 (1989-04-01), Okumura
Black and Decker Power Tools Catalog (1984), p. 7.

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