Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1993-05-28
1994-09-20
Apley, Richard J.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
81467, 606104, B25B 23153
Patent
active
053478940
ABSTRACT:
The present invention relates to a torque limiting device for use in the affixation of a halo-type traction tool to the skull of a person. The torque limiting device has a shaft or shank embedded in a handle member which rotatably engages a skull pin during the fixation of a halo-type traction device to an individual. The torque limiting device has a first shear point at a reduced shank intermediate portion which prevents rotational torque forces in excess of a predetermined level from being applied to a skull pin during the attachment procedure of a medical cervical traction brace or tool. The present invention also includes a second shear point at the shank-handle interface which acts as a second safety mechanism to ensure that excessive pressure is not applied, and undesirable skull penetration does not occur, during the attachment procedure of a skull pin and halo to an individual's skull. The torque limiting device further includes a skull pin engaging end. The handle encapsulates a substantial portion of the shank, including the first and second shear points, and a handle-shank interface retaining collar and groove arrangement from which the pin engaging end extends also from the handle. Upon release of the first shear point or the second shear point, the handle and skull pin engaging end may rotate free of each other without separation of the handle from the skull pin engaging end, thereby keeping the device in one piece for easy handling, loss prevention and protecting an individual from risk of injury.
REFERENCES:
patent: 1398842 (1921-11-01), Cruse
patent: 2740315 (1956-03-01), Gouverneur II
patent: 3072118 (1963-01-01), Standerwick et al.
patent: 3331267 (1967-07-01), Tietge
patent: 3391693 (1968-07-01), Georgiade et al.
patent: 3604412 (1971-09-01), Gardner
patent: 3669102 (1972-06-01), Harris
patent: 3923046 (1975-12-01), Heifetz
patent: 4215680 (1980-08-01), Kesselman
patent: 4251600 (1980-08-01), Kesselman
patent: 4612930 (1986-09-01), Bremer
patent: 4667660 (1987-05-01), Eingorn
patent: 4833951 (1989-05-01), Karcher et al.
patent: 4838264 (1989-06-01), Bremer et al.
patent: 5158458 (1992-10-01), Perry
patent: 5176050 (1993-01-01), Sauer et al.
Guard-Nut Torque Limiter; May 1980 Pamphlet; 20450 Broadway, Drawer 299, Sonoma, Calif. 95476.
Apley Richard J.
Dvorak Linda C. M.
PMT Corporation
LandOfFree
Torque limiting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torque limiting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torque limiting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2428701