Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1998-07-20
2000-06-06
Scherbel, David A.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
73862143, 7386208, 81478, B25B 2314
Patent
active
06070506&
ABSTRACT:
A ratcheting electronic torque wrench has an input beam in the form of a hollow housing with a handle end and a work end, a ratchet head disposed within the work end of the housing and rotatable relative thereto and a reaction beam disposed within the housing and having one end fixed to the ratchet head for pivoting therewith about the axis thereof and an input end resiliently urged to a neutral position relative to the housing by two bias springs respectively engaging opposite sides of the reaction beam. A Hall-effect sensor carried by the input end of the reaction beam is disposed between two permanent magnets and is powered by a battery for producing an output indicative of reaction beam movement, which is proportional to applied torque. A display circuit can display the applied torque or a predetermined torque level set by a preset circuit. An alarm signal is generated when the applied torque reaches the predetermined level.
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P. 45 of CDI catalog for Micrometer Adjustable Rubber Gripp Down Handle, Model 2000MF. (Feb. 1997).
P. 47 of CDI catalog for Pre-Set "Clicker" Interchangeable Head Wrenches. (Feb. 1997).
Ojini Anthony
Scherbel David A.
Snap-on Tools Company
LandOfFree
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