US Patent: 3,763,724
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| Automatic Torque Release Wrench of the Preset Type
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Patentee:
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| Talmage O. Green (exact or similar names) - Schaumburg, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 26, 1971 |
| Granted: |
Oct. 09, 1973 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Harry C. Alberts - patent attorney
Abstract
The structure embodies an elongated tubular handle member with a work engaging member projecting therefrom at one end thereof to provide a transverse shank to which detachable sockets of various standard sizes are applied to turn fasteners to a predetermined torque load. Confronting primary and secondary flex beams are disposed in the tubular handle member for engagement with each other and the work engaging member. A spring urged trigger release is movably mounted on one flex beam to cooperate with the other flex beam in the region of its maximum flex responsive to resisting the torque load, and this trigger release is in the path of the other flex beam end to normally engage therewith until the trigger moves with the flex of both beams to engage the internal wall of the tubular handle member, thereby mechanically releasing its connection therewith so that the load in the primary beam momentarily equals the combined bending load originally sustained by both primary and secondary beams. A calibrated multiple scale slide fitted with a pivotal ramp cooperates with the spring urged primary beam end to preset the release of the secondary beam relative to the trigger latch connection therebetween at any applied turning load within the capacity range of the torque wrench as preset on any scale of the calibrated slide which is viewed through openings on both sides of the tubular handle member serving also as a housing for the instrumentalities. When the applied load equals the preset value on the calibrated scale, the trigger latch engages the inside wall of the housing, thereby releasing the secondary beam which causes an audible signal and also a sudden relaxation of part of the applied force or torque to create a momentary interruption which effects a mild vaibratory shock and an audible click due to the trigger latch disconnect between the beams to notify the user that the preset load has been reached. The user then stops applying any further turning load, and this momentary release will permit the spring urged trigger latch and the primary beam to re-connect the parts for further application of the wrench to another fastener.
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