Torque wrench testing devices and the like
AssigneePrecision Instruments, Inc.
InventorTalmage O. Green
Life of this patent
Estimating the term…
Abstract
Multiple range calibrating apparatus for checking the accuracy of torque wrenches and other force measuring instruments comprising a mechanism for applying torque to a torque receiving element connected between the instrument being checked and a force measuring device or instrumentality. The torque receiving element is connected to the measuring device by a novel linkage that is adjustable to vary the ratio of input torque to the force applied to the measuring device so that instruments of varying capacity or calibrated in different multiple measuring scales may be tested therewith. The multiple scales on the measuring device are related to the linkage ratios so that different units of torque may be indicated. This greatly enlarges the utilization range of such testers.
Claims12
A self-contained measuring and testing device comprising a frame, a calibrated measuring instrumentality with multiple scales to register the load applied by a single scale calibrated work engaging device under test, said work engaging device being calibrated to correspond with one of said multiple scales on said measuring instrumentality, loadable means on said frame to receive said calibrated work engaging device for applying a load to a selected scale on said calibrated measuring instrumentality, fixed multiple sets of fulcrums on said frame, displaceable fulcrum complements on said frame to confront different sets of sid fixed fulcrums, and moveable linkage connected to said displaceable fulcrum complements to effect the shifting thereof to confront different sets of fixed fulcrums to vary the ratio of input load applied by said calibrated work engaging device to said multiple calibrated measuring instrumentality so that calibrated work engaging devices of varying calibrations may be tested against a corresponding scale on said multiple scale calibrated measuring instrumentality to check the accuracy of said calibrated work engaging device.
In a measuring and testing device, the combination with a frame, of a calibrated measuring instrumentality having multiple scales thereon to register the turning load applied by a single scale calibrated work engaging device under test, said work engaging device being calibrated to correspond with one of said multiple scales on said measuring instrumentality, rotary loadable means on said frame to receive said calibrated work engaging device for applying a load to register on a selected scale on said calibrated measuring instrumentality, fixed and moveable contacts operatively effective between said loadable means and said calibrated multiple scale measuring instrumentality to transmit the applied load of said calibrated work engaging device to register on said multiple scale calibrated measuring instrumentality, and control means for selectively matching said fixed and moveable contacts to properly transmit the applied rotary load impressed by said calibrated work engaging device to a corresponding scale on said multiple scale calibrated measuring instrumentality so that differently calibrated work engaging devices with calibrations corresponding to one of said multiple scales on said calibrated measuring instrumentality may be tested thereon for accuracy.
Dependencies are inferred from the claim text.