Positive lock mechanism for moving board

Details Positive lock mechanism for moving board Positive lock mechanism for moving board

1986-02-10

1987-01-27

Mitchell, David M.

Land vehicles

Step or abutment ascending type vehicle

With skid or rollerway

188 5, 280 12M, B62B 504

Patent

active

046390030

ABSTRACT:
Disclosed is a positive lock mechanism for use with a moving board to move an object up or down stairs by sliding such moving board over the crests of the stairs. The positive lock mechanism comprises a shaft, spade element and torsion spring. The moving board freely mounts the shaft which carries the spade element and torsion spring. The torsion spring biases the spade element to a retractable positive lock position for engagement with a stair tread whereby the moving board and its load can remain in a free standing position of rest on the stairs. The moving board may be slid up or down over the crests of several steps before the spade element is allowed to engage a stair tread in positive lock position, or the movers may take one step at a time by allowing the spade element to engage each step successively.

REFERENCES:
patent: 1714352 (1929-05-01), Echola
patent: 2347441 (1944-04-01), Snow
patent: 2456002 (1948-12-01), Jonette
patent: 3015123 (1962-01-01), Descarries
patent: 4130291 (1978-12-01), Salthre et al.
patent: 4504071 (1985-03-01), Drummond

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