Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1985-09-03
1986-12-23
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
81429, B25B 23157
Patent
active
046305122
ABSTRACT:
In a motor-driven screw driving device, a drive unit and a drive member are located within a housing and are interconnected by a torque-limiting coupling. The coupling is adjustable by changing the force applied to a spring element. The spring element is supported within a stop sleeve located within the housing and the stop sleeve is axially displaceable relative to the housing. A depth stop on the drive spindle is adjustable relative to the stop sleeve. An actuating sleeve accessible on the exterior of the screw driving device affords the adjustment of the stop sleeve and the depth stop. A connecting element is secured to the actuating sleeve and is in engagement with the depth stop so that the actuating sleeve and depth stop can be rotated as a unit. The connecting element is selectively engageable with the stop sleeve so that the actuating sleeve and stop sleeve can be rotated as a unit for adjusting the torque-limiting coupling.
REFERENCES:
patent: 2796161 (1957-06-01), Graybill
patent: 3454059 (1969-07-01), Sindelar
patent: 3527273 (1970-09-01), Falter
patent: 3869942 (1975-03-01), De Caro
patent: 3934629 (1976-01-01), Boman
patent: 3943800 (1976-03-01), Lesner
Hilti Aktiengesellschaft
Meislin Debra S.
Schmidt Frederick R.
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