Torque wrench

Details Torque wrench Torque wrench

1978-04-14

1980-06-17

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

B25B 2314

Patent

active

042077834

ABSTRACT:
An adjustable torque wrench including an elongate tubular lever arm, a work-engaging head at the front end of the arm, an elongate adjustable screw within and accessible at the rear end of the arm, a polygonal driver carried by the screw within the arm, a hand grip with a front section fixed about the arm and a rear section normally adjacent the rear end of said front section and rear end of the arm, an elongate drive sleeve on and projecting forwardly from the rear section into the arm and about the driver; said sleeve has a cylindrical opening in its rear portion to normally freely accommodate the driver and a polygonal opening in its front portion to establish driving engagement with said driver when the rear section is moved rearwardly; said rear section has a forwardly projecting annular skirt with circumferentially spaced axially extending grooves; said front section has a rear extension with circumferentially spaced axially extending ribs normally engaged in the skirt and the grooves; the rear end of the arm projects rearward from the front section to define an annular reference edge and carries circumferentially spaced calibrations; said sleeve has a portion which is exposed and visible adjacent the rear end of the arm when it is moved rearwardly from its normal position, said visible portion of the sleeve carries a longitudinal reference line and longitudinally spaced circumferential calibrations which cooperate with the rear end of the arm to indicate the longitudinal position of the screw relative to the arm when the rear section is in its rearmost position.

REFERENCES:
patent: 3581606 (1971-06-01), Grabovac
patent: 3772942 (1973-11-01), Grabovac
patent: 3890859 (1975-06-01), Grabovac et al.

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