Actuation of semi-trailer support legs

Supports – Props and braces – Automobile

Patent

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Details

2481885, 248651, 248688, A47F 500

Patent

active

057093628

ABSTRACT:
The present invention relates to semi-trailer support legs. In order to avoid damage to trailer support legs by failure to raise the legs when the trailer is coupled to a towing unit for movement, the present invention provides a pivotal foot at the end of the support leg and an actuator for controlling pivotal movement of the foot between a raised position providing sufficient clearance for normal operation and a deployed position for supporting the trailer on uncoupling of the towing unit. More particularly raising and lowering of the pivotal foot is controlled automatically on coupling and uncoupling respectively of the towing unit and trailer.
A particularly convenient arrangement results where actuation of the foot is responsive to the connection and disconnection of a control line between the towing and trailer units. More particularly still, the control line is the emergency brake line which would be connected as a matter of course. The actuator is supplied from a branch off said emergency brake line.

REFERENCES:
patent: 3454251 (1969-07-01), Dye
patent: 3563567 (1971-02-01), Harp
patent: 3874696 (1975-04-01), Gardner
patent: 4268066 (1981-05-01), Davis
patent: 4312520 (1982-01-01), Burman
patent: 4466637 (1984-08-01), Nelson
patent: 5054805 (1991-10-01), Hungerink
patent: 5141197 (1992-08-01), Mackaay
patent: 5348258 (1994-09-01), Rasmussen
patent: 5451080 (1995-09-01), Kneile

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