Sleeve for increasing retention value of a screw

Details Sleeve for increasing retention value of a screw Sleeve for increasing retention value of a screw

1992-12-08

1994-07-26

Huppert, Michael S.

Railways: surface track

Fastenings

Spikes

411 42, 411 55, 411 72, 411178, 238377, F16B 1306

Patent

active

053321537

ABSTRACT:
The retention value of a screw previously inserted into a wooden railroad tie is increased by an axially extending sleeve ( 20 ) having an external thread ( 24 ) and an internal thread (25). The thread revolutions of the internal thread (25) are offset axially by half (h) the thread pitch (H) of the external thread (24). Due to this offset of the threads, the screw is positioned in the sleeve so that its threads are located between the external thread revolutions affording a new retention, while the external thread (24) seats within the thread previously formed in the wooden railroad tie by the screw.

REFERENCES:
patent: 730585 (1903-06-01), Thiollier
patent: 843713 (1907-02-01), Stucki
patent: 4439078 (1984-03-01), Dessouroux
patent: 5160225 (1992-11-01), Chern

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