Truck hoist
OwnerEldon D. Jonesinventor
Life of this patent
Estimating the term…
Abstract
A hoist for raising and lowering a truck bed to and from a truck frame is provided which utilizes a lever to accomplish initial lift and to further position the hydraulic cylinder at a more efficient angle for completion of the lift process. The hoist further provides a locking device to immobilize the lever and one end of the hydraulic cylinder during certain phases of the raising and lowering cycle, improving safety and stability in the dump bed raising and lowering process.
Claims20
A hoist for raising or lowering a truck bed to and from a truck frame which is capable of being located between said bed and said frame, said hoist comprising:
- an extendible and retractable cylinder connected at one end to a lever mechanism and at the other end connectable to the underside of said bed, said lever mechanism comprising at least a first pivot, a first pivot centerline, a second pivot, and an elongated arm, said first pivot being attachable to said truck frame and said second pivot being rotatably attached to said cylinder, said second pivot being located at a first offset distance from said first pivot centerline, and being rotatable about said first pivot when said cylinder is extended or retracted, said elongated arm being pivotally connected to said first pivot at one end and comprising a first roller mechanism for engagement with said truck bed at the other end, said elongated arm extending and angling upwardly from said first pivot;
- said lever mechanism being so located that when said cylinder is caused to extend, said cylinder pushes against said lever mechanism causing said lever mechanism to rotate about said first pivot, and causing said elongated arm to raise said bed from said frame;
- said hoist further including a stop mechanism so located at a second selected offset distance from said first pivot centerline opposite the side of said first pivot centerline of said first offset distance, such that when said second pivot is caused to rotate into contact with said stop mechanism said second pivot is located proximal said second offset distance;
- and further extension of said cylinder causes said cylinder to raise said bed further from said frame.
A hoist for raising or lowering a truck bed to and from a truck frame which is capable of being located between said bed and said frame, said hoist comprising:
- an extendible and retractable cylinder connected at one end to a lever mechanism and at the other end connectable to the underside of said bed, said lever mechanism comprising at least a first pivot, a first pivot centerline, a second pivot, and an elongated arm, said first pivot being attachable to said truck frame and said second pivot being rotatably attached to said cylinder, said second pivot being located at a first offset distance from said first pivot centerline, and being rotatable about said first pivot when said cylinder is extended or retracted, said elongated arm being pivotally connected to said first pivot at one end and comprising a first roller mechanism for engagement with said truck bed at the other end, said elongated arm extending from said first pivot;
- said lever mechanism being so located that when said cylinder is caused to extend, said cylinder pushes against said lever mechanism causing said lever mechanism to rotate about said first pivot, and causing said elongated arm to raise said bed from said frame;
- said hoist further including a stop mechanism so located at a selected offset distance from said first pivot centerline opposite the side of said first pivot centerline of said first offset distance, such that when said second pivot is caused to rotate into contact with said stop mechanism, further extension of said cylinder causes said cylinder to raise said bed further from said frame;
- said hoist further comprising a locking device to lock said second pivot at a point of rotation about said first pivot.
Dependencies are inferred from the claim text.