Pin and process for its manufacture
First Claim
Patent Images
1. In combination, a pin and a collar comprising:
- (a) the collar having;
an internally threaded axial bore and external, longitudinally extending lobes on its outer surface, the lobes being capable of failing plastically in radial compression upon the application of a predetermined load onto them, the load being effected by a driving tool and at least one reacting sheet while threading the collar onto the pin to plastically displace collar material radially inward into the axial bore and into locking relationship with the pin;
(b) the pin having;
(i) a manufactured head at one end of the pin for applying a clamp-up load on the sheet;
(ii) a shank extending longitudinally from the head to the other end of the pin;
(iii) a plurality of regularly placed flutes extending longitudinally along the shank from the end of the pin opposite the head and ending at points spaced from the head, each flute being substantially concave outward in cross-section;
(iv) external roll-formed threads on the shank extending from the end of the pin opposite the head past the ends of the flutes and crossing over the flutes for threaded receipt by the threads of the collar, the depth of the flutes being substantially equal to the root diameter of the external threads in the flutes;
(v) a ridge crest on each side of the flutes and extending circumferentially at the major diameter of the threads, each of the ridge crests spanning a circumferential distance on the order of the distance across each flute at the major diameter; and
(vi) means to restrain the pin from rotating while threading the collar onto the pin and developing the predetermined load;
whereby, displaced collar material flows into the flutes to lock the collar to the pin upon application of the predetermined load onto the lobes.
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0 Petitions
Accused Products
Abstract
A threaded pin has flutes along the threads formed by roll-forming threads over a preformed section having either flat sides or dished sides. The major diameter of the threads lies along ridge crests bordering the flutes, and the minor diameter of the threads lies at the base of the flutes. The threads extend along the major diameter in each of the ridge crests for a distance on an order of magnitude of the distance across the mouth of each flute. The preformed section is formed by extrusion. The flutes provide space for material from a threaded collar forced into them to provide a thread lock.
70 Citations
9 Claims
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1. In combination, a pin and a collar comprising:
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(a) the collar having; an internally threaded axial bore and external, longitudinally extending lobes on its outer surface, the lobes being capable of failing plastically in radial compression upon the application of a predetermined load onto them, the load being effected by a driving tool and at least one reacting sheet while threading the collar onto the pin to plastically displace collar material radially inward into the axial bore and into locking relationship with the pin; (b) the pin having; (i) a manufactured head at one end of the pin for applying a clamp-up load on the sheet; (ii) a shank extending longitudinally from the head to the other end of the pin; (iii) a plurality of regularly placed flutes extending longitudinally along the shank from the end of the pin opposite the head and ending at points spaced from the head, each flute being substantially concave outward in cross-section; (iv) external roll-formed threads on the shank extending from the end of the pin opposite the head past the ends of the flutes and crossing over the flutes for threaded receipt by the threads of the collar, the depth of the flutes being substantially equal to the root diameter of the external threads in the flutes; (v) a ridge crest on each side of the flutes and extending circumferentially at the major diameter of the threads, each of the ridge crests spanning a circumferential distance on the order of the distance across each flute at the major diameter; and (vi) means to restrain the pin from rotating while threading the collar onto the pin and developing the predetermined load; whereby, displaced collar material flows into the flutes to lock the collar to the pin upon application of the predetermined load onto the lobes. - View Dependent Claims (2, 3, 4, 5)
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6. A combination of an improved pin and a collar for use with the pin comprising:
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(a) the collar having an internally threaded axial bore and a plurality of plastically deformable lobes on the outer surface of the collar that fail in radial compression upon the application of a load onto them by a driver and a sheet that corresponds to a predetermined clamp-up load on the sheet, and, with the failure, material of the lobes forces collar material ahead of it into the axial bore of the collar to lock the collar and the pin together; (b) the pin having; (i) a manufactured head at one end of the pin for applying a clamp-up load onto the sheet; (ii) a shank extending longitudinally from the head to the other end of the pin; (iii) a plurality of flutes extending longitudinally along the shank to end points spaced from the head, each flute having a substantially concave outward curvature, a mouth and a base; (iv) roll-formed external threads on the shank and flutes for engaging the threads of the collar, the threads extending past the end points of the flutes; (v) ridge crests defining the boundaries of the mouths of the flutes, the ridge crests being formed of radially outwardly displaced shank material from the roll forming, each crest being at the major diameter of this external thread and extending at the major diameter for a distance of on the order of the width of each flute mouth; (vi) the base of the flutes being formed of radially inwardly displaced shank material from the roll forming and having a diameter substantially equal to the minor diameter of the threads; and (vii) wrenching means to restrain the pin from rotation during threading of the collar onto the pin and the development of the predetermined load; whereby displaced collar material flows into the flutes to lock the collar to the pin upon application of the predetermined load onto the lobes, the flanks of the threads in the crest carry considerable load, and the displaced collar material in the flutes is positively retained there by the concavely curved walls of the flutes. - View Dependent Claims (7, 8, 9)
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Specification