Land vehicles: dumping – Tilting – Operating mechanism
Reexamination Certificate
2000-08-08
2001-07-03
Gordon, Stephen T. (Department: 3612)
Land vehicles: dumping
Tilting
Operating mechanism
C298S01900R
Reexamination Certificate
active
06254192
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a dump trailer having a bed raising mechanism.
It is known to provide large trailers and trucks with mechanisms for raising or tilting the bed in order to dump the contents contained therein. Such mechanisms are typically hydraulically operated and are expensive and complex.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a trailer with a dumping mechanism that is simple to construct and relatively inexpensive.
The trailer of the present invention is comprised of a trailer frame formed of hollow members adapted to receive and store compressed air. Wheels are rotatably attached to the bottom of the trailer frame. A tongue extends from the front end of the trailer end for hitching the trailer to a towing vehicle.
The rear end of a trailer bed is rotatably mounted to the rear end of the trailer frame. A trailer lifting mechanism for raising the front end of the trailer bed is comprised of an inflatable air bag assembly attached at its lower end to the trailer frame and at its upper end to the bottom of the trailer bed.
An air compressor is mounted on the axle of the trailer wheels adjacent one of the wheels. The air compressor is operated by rotation of the adjacent wheel and pumps air into the hollow frame members until a maximum air pressure is achieved. Air from the hollow frame members can be communicated to the air bag assembly for inflation thereof by means of a two way valve. Air can be released from the air bag by means of the two way valve.
The trailer bed is connected to the trailer frame in a manner such that the rear end of the floor of the bed is higher than the front end of the floor, thereby preventing material from inadvertently spilling from the trailer during transport and alleviating the need for a tailgate.
REFERENCES:
patent: 3659899 (1972-05-01), Phillips et al.
patent: 3784255 (1974-01-01), Smock
patent: 4145085 (1979-03-01), Taber et al.
patent: 4572579 (1986-02-01), Saito
patent: 4968210 (1990-11-01), Friedrich
patent: 5067774 (1991-11-01), Trowland
patent: 5560684 (1996-10-01), Gilmore
patent: 5975643 (1999-11-01), Smith et al.
Gordon Stephen T.
Howard Robert E.
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