Automatic stud driver having thread relief for high torque appli

Details Automatic stud driver having thread relief for high torque appli Automatic stud driver having thread relief for high torque appli

1988-02-02

1989-04-11

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Stud-removal and implacement

B25B 1900

Patent

active

048195197

ABSTRACT:
A stud driver has threaded jaws with thread relief provided on a leading edge area of the jaws to reduce thread marking or deformation of the thread on the stud when the stud is driven under high torque conditions. The thread relief in the leading edge area of the jaws creates a shallower angle and increases contact area. If the stud driver is subjected to unusually high torques, the increased contact area prevents shearing of the thread on the stud.

REFERENCES:
patent: 3161090 (1964-12-01), Mclellan
patent: 3793912 (1974-02-01), Bilz
patent: 4371354 (1983-02-01), McKean
patent: 4470329 (1984-09-01), McKean
patent: 4476749 (1984-10-01), McKean
patent: 4513643 (1985-04-01), McKean
patent: 4590826 (1986-05-01), McKean
patent: 4688315 (1987-08-01), Jannke
patent: 4724730 (1988-02-01), Mader
Robert O. Parmley, P.E., Standard Handbook of Fastening and Joining, "Threaded Fasteners--Descriptions and Standards", pp. 22-27, 1977.

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