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US 3,965,778 AGranted
Multi-stage tightening system
AssigneeStandard Pressed Steel Co.
InventorsArthur J. Aspers, Robert J. Finkelston
Life of this patent
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AssigneeStandard Pressed Steel Co.
InventorsArthur J. Aspers, Robert J. Finkelston
Estimating the term…
A sequential tightening system is disclosed in this application for tightening a plurality of fasteners to a final predetermined condition and includes a plurality of wrenches for tightening the fasteners and a control system operatively associated with each of said wrenches for tightening the fasteners to a first predetermined condition, preferably their seated condition and at a relatively high output speed of the wrenches, and temporarily discontinuing the tightening procedure. When the tightening procedure of all of the wrenches has been temporarily discontinued, the control means restarts the tightening procedure of each wrench simultaneously or, if desired, sequentially, and, preferably at a lower output speed of the wrenches. As each wrench tightens its operatively engaged fastener to the final predetermined condition, the control means discontinues the tightening procedure of that wrench.
A multi-stage tightening system including a plurality of wrenches each adapted to tighten a fastener, means for discontinuing the output of each of said wrenches at an initial predetermined condition, control means operatively associated with each of said wrenches for shutting off said wrenches at a final predetermined condition, and interface means operatively associated with said control means for determining when all of said wrenches have discontinued their output, including checking means for determining if all of said wrenches have provided an output, and for thereafter reactivating said wrenches if each of said wrenches maintains some minimum output, whereby said control means can shut off said wrenches at said final predetermined condition.
A multi-stage tightening system including a plurality of wrenches each adapted to tighten an individual fastener, means operatively associated with said wrenches for discontinuing the rotational output of said wrenches at a predetermined seated condition of said fasteners, control means operatively associated with each of said wrenches for determining the yield point of the fastener being tightened by its associated wrench and for shutting off said wrench, interface means operatively associated with all of said control means for determining when all of said wrenches have discontinued their rotational output and for reactivating said wrenches whereby said control means can shut off said wrenches.
A multi-stage tightening system comprising a plurality of wrenches each adapted to tighten an individual fastener in an individual joint assembly, means operatively associated with said wrenches for discontinuing the rotational output thereof at a predetermined seated condition of said fasteners in said joint assemblies, control means operatively associated with each of said wrenches for determining the yield point of each said joint assembly as measured by the fastener being tightened by its associated wrench and for shutting off said wrench, and interface means operatively associated with all of said control means for determining when all of said wrenches have discontinued their rotational output and for reactivating said wrenches, whereby said control means can shut off said wrenches.
Dependencies are inferred from the claim text.