Dental tool with shear pin handle

Details Dental tool with shear pin handle Dental tool with shear pin handle

2006-12-05

2006-12-05

Wilson, John J (Department: 3732)

Dentistry

Apparatus

Hand manipulatable implement

C433S173000, C081S471000

Reexamination Certificate

active

07144252

ABSTRACT:
A tool is used to limit the torque applied to tighten the threaded connection of prosthesis components placed in skeletal bones, for example dental implants. The device had a handle, a retaining screw, a single use torque limiting shear pin and a drive shaft. The handle has a tapered counter sunk cross bore with left handed threads to allow installation of a drive shaft which engages a torque limiting shear pin which, in turn, engages a left hand threaded retaining screw. The drive shaft extends from the handle to engage any threaded fastener that has a head that corresponds to the drive shaft end. The drive shaft and the shear zone of the shear pin are completely isolated within the wrench handle so that all rotational force is utilized in the actual shearing of the shear pin to a torque accuracy of ±0.3 Ncm, approximately.

REFERENCES:
patent: 3753625 (1973-08-01), Fabrizio et al.
patent: 5030096 (1991-07-01), Hurson et al.
patent: 5295831 (1994-03-01), Patterson et al.
patent: 5347894 (1994-09-01), Fischer
patent: 6162053 (2000-12-01), Hollander
patent: 6186785 (2001-02-01), Rogers et al.
patent: 6206696 (2001-03-01), Day
patent: 6308598 (2001-10-01), O'Neil

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