Micro-torque limiting, shock limiting production tool

Details Micro-torque limiting, shock limiting production tool Micro-torque limiting, shock limiting production tool

1995-09-25

1997-08-12

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81476, 192 663, B25B 23157

Patent

active

056554214

ABSTRACT:
A micro-torque limiting production tool comprises a hollow cylindrically shaped handle in which a combination bit retainer clutch mechanism is supported. The combination bit retainer-clutch mechanism includes a pair of cylindrical clutch plates of a plastic composite composed of teflon fluorocarbon and acetal resin, having bulbous regions of diameter D1 in axially broad contact with each other within the central cavity of the handle to define a primary braking surface of area .pi.(D1/2).sup.2. Reduced regions of the clutch plates face in opposite directions, from a shoulder region to a remote end segment, the remote end segment of one of the reduced regions, extending through a secondary braking plate also of a plastic composite as described above, to define a secondary annular braking surface equal to .pi.[(D1-D2)/2].sup.2 (where D1 and D2 are exterior and interior diameters of such plate). Such primary and secondary braking surfaces are provided with a highly accurate, longitudinally acting composite friction force that establishes a set point value for such braking surfaces, above which such surfaces do not act as cohesive unit but separate into individual elements that are not permitted to cohesively rotate. Result: only a torque value at or below the set point level can be applied to an exterior fastener by the bit retainer-clutch mechanism of the invention.

REFERENCES:
patent: 1697595 (1929-01-01), Henderson
patent: 1876990 (1932-09-01), Lormor
patent: 2398330 (1946-04-01), Rueb

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