Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Including gauge means
Patent
1991-02-25
1992-04-07
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
With means to indicate application of predetermined...
Including gauge means
411916, 73761, 116212, 116DIG34, F16B 3102, G01L 500
Patent
active
051022737
ABSTRACT:
A bolt for attaching a first member to a second with a desired compressive force. The bolt has a cylindrical body with a threaded section on a first end and a head on a second end. The cylindrical body had a longitudinal bore which extends to a cross bore in the head. A pin located in the cross bore has a first flat surface separated from as second flat surface by a shoulder. A rod located in the longitudinal bore has a first end fixed to the cylindrical body and a second end that is located on the first flat surface. A spring acts on the pin to hold the shoulder against the rod. An input torque applied to the head causes the threads to move into threads on the second body. When the head engages the first body, further torque results in expansion or elongation of the cylindrical body. The rod freely moves in the longitudinal bore and when a predetermined elongation occurs corresponding to the depth of the shoulder on the pin, the spring moves the pin to align the second flat surface over the rod. With the second flat surface in alignment with the rod, a portion of the pin extends past the head to provide a visual indication that a desired compressive force has been developed between the first and second members.
REFERENCES:
patent: 3589234 (1971-06-01), Trigg
patent: 3908508 (1975-09-01), Payne
patent: 4041776 (1977-08-01), Payne
Allied-Signal Inc.
McCormick Jr. Leo H.
Palguta Larry J.
Walsh Robert A.
Wilson Neill R.
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