Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System

This invention serves as a truck unloader system that helps reduce the work necessary to unload debris, sand, gravel, etc. from pick-up trucks. This unloader system with its dual pull open bottom feature is adaptable to various vehicles for easy unloading. It was primarily invented to help unload construction debris from pickup trucks, but can be adapted to unload material from larger trucks and trailers.

U.S. Pat. Nos. 3,630,571; 4,084,851; 3,740,097; 3,659,899; 3,871,706; 4,030,751; 3,446,534; 5,447,361; 4,572,579; 4,126,357; 4,681,371 all utilize a solid bottom cargo box that is mechanically lifted or slid into a tilt position to remove cargo or debris from a solid bottom cargo box that fits on or in a truck or trailer. These inventions are vastly different form the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System that slides cargo or debris on the bottom of the vehicle to the back of the vehicle where it is unloaded or falls through the open bottom directly onto the ground.

U.S. Pat. Nos. 3,904,049; 5,340,266; 4,842,471; 4,784,563; 4,629,390; 5,156,518; 3,978,996 all utilize a temporary or permanently mounted conveyer belt on which cargo is placed directly on top and that, when in motion, transports cargo or debris to the back of the vehicle where it is unloaded or falls directly onto the ground. These inventions are vastly different from the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System that slides cargo or debris on the bottom of the vehicle to the back of the vehicle where it is unloaded or falls through the open bottom directly onto the ground.

U.S. Pat. Nos. 4,082,136; 4,113,122; and 4,111,318 all utilize a plurality of cables which are laid on the floor of the vehicle and which support loads placed thereon. The cables can be moved whereby loads supported on the cables are moved along the vehicle floor. These inventions are vastly different from the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System that slides cargo or debris on the bottom of the vehicle to the back of the vehicle where it is unloaded or falls through the open bottom directly onto the ground.

U.S. Pat. No. 5,143,508 titled Cargo Conveying Vehicle Having a Moveable Bulkhead Located Therein claims (1) A cargo carrying vehicle comprising a body having an interior, an internal floor, a left internal sidewall having an upper edge and a lower edge, a right internal side wall having an upper edge and a lower edge, a longitudinal axis, a front end and a rear end and (2) a moveable bulkhead mounted in said interior. The claims clearly present a box vehicle with permanent sides and floor with a permanently mounted bulkhead that moves forward and backwards through the use of cables and pulleys that stabilize and move the bulkhead from the four comers of the bulkhead utilizing a multitude of pulleys, attachments, motors or pistons. Claim 30 cites a cargo carrying vehicle as cited in claim 17 wherein said internal floor is reciprocating. The 38 claims defining this invention describe a vehicle with a cargo compartment that has a permanently mounted moveable bulkhead therein that is designed to function with a reciprocating floor. This invention is different from the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System. The primary difference is that it is portable from vehicle to vehicle. The second difference is that only two tension straps, cables, chains or ropes provide force to the cargo box. The third difference is that the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System is a unit that has two side boards and a back board that fit inside a pickup truck or trailer. The portable pickup truck unloader system is vastly different from the permanently mounted moving bulkhead inside a box vehicle.

It is an objective of this invention to provide a mechanical device for the easy unloading of pickup trucks. A second objective of this invention is to produce a mechanical device for the unloading of vehicles that is an economical alternative to expensive tilt dump methods of material removal from vehicles. It is a third objective of this invention to produce a mechanical device that can be hand operated or motor operated depending upon application. It is a fourth objective of this invention to create a mechanical apparatus that can be custom fit to specific applications. The dual pull cable, strap (nylon or other), chain, or rope feature provides this versatility for specific design needs and applications.

The present invention will be more fully understood by reference to the following description of the attached drawing.

FIG. 1 is a side view of the unloader system in a pickup truck with the debris or cargo falling through the open bottom onto the ground as the unloader box is moved towards the back of the pickup truck.

FIG. 2 is a 3/4 view of the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System with hand operated winch and optional motor drive.

FIG. 1 is a side view of the unloader system in a pickup truck halfway deployed with debris cargo falling through the open bottom onto the ground. A hand winch (4) connecting both cables, straps, chains, or ropes synchronizes torque when operated (figure shows right cable, strap, chain or rope (7)). The cables, straps, chains, or ropes are attached to the back of the pickup truck (3) and are winched in, thereby pulling the unloader box towards the back of the vehicle. The unloader box comprises two side boards and a back board (right side board shown (6)). The cargo or debris (2) falls through the open bottom onto the ground as the unloader box is moved towards the back of the pickup truck. The unloader box is placed in the bed of a standard pickup truck (1).

FIG. 2 is a 3/4 view of the Dual Pull Open Bottom Portable Pickup Truck Trailer Unloader System with hand operated winch and optional motor drive. The portable unloader system disassembles into components for easy installation and storage. Adjacent to the left side board (8) is the left cable, strap, chain, or rope (9) and adjacent to the right side board (6) is the right cable, strap, chain, or rope (7), both of which serve as the dual pull tension mechanisms. The side boards are attached to the back board (5). A torque winch system can be synchronized by use of a connected bar winch (4) that turns both cables, straps, chains or ropes simultaneously. An optional motor attachment (10) serves as one method of driving the synchronized torque connecting bar. The open bottom of the cargo compartment (11) permits debris or cargo to fall through the open bottom onto the ground.

A dual pull open bottom portable pickup truck trailer unloader system can be a solid back board, a set of two side boards connected to said back board creating the open bottom cargo space and means for connecting synchronized torque that evenly pulls two chains, cables, ropes or straps that run outside the side boards where the mechanical apparatus is connected to the truck or trailer and the ends of the two chains, cables, ropes, or straps connect to said back board and side boards.

A dual pull open bottom portable pickup truck trailer unloader system can also be a solid back board, a set of two side boards connected to said back board forming a U-shaped open ended open bottom cargo space that permits the cargo to slide on the bottom of the truck or trailer when synchronized mechanical pull is applied to two chains, cables, ropes or straps that connect between said back board and side boards and the back of the vehicle.

A dual pull open bottom portable pickup truck trailer unloader system can be mechanically driven by hand, winch, electrical, or hydraulic motor or motors attached to said back board and side-board cargo container either directly mounted to said back board and side boards on the vehicle, whereby connecting the cables, straps, chains or ropes between said back board and side boards and the back of the vehicle provides mechanical tension to move the unloader box toward the back of the vehicle.

A dual pull open bottom portable pickup truck trailer unloader system can include a closed end on the U-shaped back board side board cargo compartment making an open bottom box unloader.

A dual pull open bottom portable pickup truck trailer unloader system can be disassembled for easy storage into components of a back board and two side boards.