Key-lock spike

Details Key-lock spike Key-lock spike

1994-01-12

1995-07-04

Oberleitner, Robert J.

Railways: surface track

Fastenings

Spikes

238375, 411469, 411511, E01B 912

Patent

active

054293006

ABSTRACT:
A two-piece locking spike which includes a first shaft having a longitudinal groove extending from the top of the shaft approximately one third of the way down along one side to a tapered bottom. A second shaft is also provided which fits into said longitudinal groove and which includes a tapered point at the bottom which corresponds to the tapered bottom of said groove. After the first shaft is inserted into a medium, the second shaft (which is longer than the groove) is inserted into the groove so that when fully inserted, the bottom of the second shaft protrudes into the medium at a different angle than the first shaft. This interaction helps lock the first shaft more snugly in place in the medium. Several alternative embodiments are available including rounded and squared spikes, nails, and screws.

REFERENCES:
patent: 2182 (1841-07-01), Ballard
patent: 82900 (1868-10-01), Walton
patent: 971308 (1910-09-01), Radoman
patent: 1409403 (1922-03-01), Plump
patent: 1444271 (1923-02-01), Plump
patent: 2016845 (1935-10-01), Turner
patent: 2389464 (1945-11-01), Snyder
patent: 2677298 (1954-05-01), Hebenstreit
patent: 3865307 (1975-02-01), Schiro

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