Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1975-11-12
1977-02-08
Purser, Ernest R.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
192150, B25B 2314
Patent
active
040067858
ABSTRACT:
A clutch connects the drive motor to the rotatable tool holder. The driven part of the clutch has a plurality of clutch recesses bounded by sloping clutch ridges, with clutch balls received in the recesses. An annular pressure body surrounds the driving part and is pressed by a threshold-torque-determining spring against the clutch balls to hold them in their recesses. When the clutch torque exceeds the threshold value, the clutch balls rise out of the clutch recesses and slip over the respective clutch ridges into the respective adjoining clutch recesses. In so doing, they briefly push back the annular pressure body. This causes the annular pressure body to drive locking balls radially inward through registering radial openings in the driving part and in a locking bolt interior to the latter. When the inner locking ball moves completely into the locking bolt, locking between the driving part and locking bolt terminates. Then, a locking spring which previously participated in the locking action by urging the locking balls radially outward can shift the locking bolt axially relative to the driving part in a sence causing a release valve device to close and terminate energization of the power tool drive motor.
REFERENCES:
patent: 3288258 (1966-11-01), Taylor
patent: 3289715 (1966-12-01), Groff et al.
patent: 3515251 (1970-06-01), Clapp
patent: 3693381 (1972-09-01), McGee
patent: 3811513 (1974-05-01), Wezel et al.
Fritschi Klaus-Peter
Roll Karl
Pate III William F.
Purser Ernest R.
Robert Bosch G.m.b.H.
Striker Michael J.
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