Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Design of fastener or substructure restricts rotation
Patent
1979-04-04
1981-06-16
Foss, J. Franklin
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Design of fastener or substructure restricts rotation
411310, F16B 3902
Patent
active
042731755
ABSTRACT:
An improved thread convolution cooperates with a mating thread convolution to prevent reverse rotation between the thread convolutions in a direction tending to loosen a fastener. In order to prevent reverse rotation between the two thread convolutions while enabling them to be rotated in a forward direction to tighten the fastener, the improved thread convolution has a resiliently deflectable spring portion which forms part of a flank of the thread convolution. During relative rotation between the two thread convolutions in a direction tending to tighten the fastener, the spring portion is deflected from an extended position to a retracted position under the influence of a flank of the mating thread convolution. This enables relative rotation to occur between the two thread convolutions without gouging or excessive scratching of the flank of either of the two thread convolutions. Upon initiation of reverse rotation between the two thread convolutions, the spring portion moves outwardly and penetrates the flank of the mating thread convolution to prevent continued rotation in the reverse of loosening direction between the two thread convolutions.
REFERENCES:
patent: Re27678 (1973-06-01), Orlomoski
patent: 113557 (1871-04-01), Pearson
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patent: 3972361 (1976-08-01), Ollis
patent: 3982575 (1976-09-01), Ollis et al.
Foss J. Franklin
The Lamson & Sessions Co.
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