Land vehicles: dumping – Miscellaneous – Vibrator means to facilitate removal of material
Reexamination Certificate
1999-07-21
2001-02-20
Dayoan, D. Glenn (Department: 3612)
Land vehicles: dumping
Miscellaneous
Vibrator means to facilitate removal of material
C298S007000, C298S02200C, C298S0230MD
Reexamination Certificate
active
06189976
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the field of gravity discharge trucks and trailers, commonly referred to as dump trucks, wherein the front end of the box is raised and the load slides out by gravity through an opening in the rear wall of the truck or trailer box. In particular, the invention relates to a rotatable extension member or spreader pan adjacent the rear of the truck box which can be rotated into co-planar relationship with the box floor to provide a longitudinal extension which more evenly spreads the contents during unloading, and which can be rotated downwardly after unloading to avoid violating length restrictions that would be applicable if the extension member remained in its longitudinally extended position during travel on the public highways.
BACKGROUND OF THE INVENTION
Prior art dump trucks and trailers have a problem when discharging their loads by raising the front end of the box to slide the contents out the rear by gravity. An extension is needed to carry the discharging material farther from the rear edge of the truck or trailer box but that means either shortening the truck or trailer box itself to stay within the highway length restrictions or doing without such extension from the rear edge of the box. The solution is the rotatable spreader pan or extension member in accordance with this invention, which can be pivoted to its extension position for unloading and then pivoted downward out of the way after unloading so the overall length of the truck or trailer is no greater than without an extension and is still within the highway limits.
SUMMARY OF THE INVENTION
This invention comprises a spreader pan having a longitudinal dimension of about six inches and a lateral dimension of about eighty-nine inches, with partially sloping side walls along each opposite edge about two inches high at the forward edge and about one inch high at the rearmost edge. The spreader pan is pivotally mounted on a lateral shaft secured to the trailer or truck box adjacent to the rear edge of the box floor, and pivotable between an operating position where the pan is substantially co-planar with the floor of the truck or trailer box and a non-operating position where the spreader pan is pivoted downward to a position that is substantially normal to the box floor and which does not extend beyond the rear edge of the truck or trailer box. An operating lever is provided on the lateral shaft with the free end of the lever connected to the plunger of a pneumatic cylinder controlled from the cab of the truck. When the plunger is extended the shaft and spreader pan is rotated or pivoted upwardly into its operating position, co-planar with the floor of the box. When the plunger is retracted the shaft and spreader pan is rotated downwardly into its out of the way, non-operating position.
REFERENCES:
patent: 165632 (1875-07-01), Thompson
patent: 701320 (1902-06-01), Fisher
patent: 3977718 (1976-08-01), Nordberg
patent: 4699428 (1987-10-01), Vick
patent: 4989918 (1991-02-01), Biddy
patent: 5823630 (1998-10-01), Graham
Carpenter Scott
Dayoan D. Glenn
Kettelson Ernest
L&M Manufacturing, Inc.
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