Lift for truck gate
First Claim
1. A mechanism for lifting the hinged gate of a truck or trailer body and the like, comprising:
- an actuator means carried underneath the body of the truck alongside the gate;
a lift arm pivotally mounted upon said actuator means below the hinge area of said gate, to be pivoted upwardly by the actuator means to move said gate from a lower open position to an upper closed position;
said actuator means including;
a smaller sprocket means connected to the pivotal mounting of said lift arm;
a larger sprocket means connected with the smaller sprocket means having a greater pitch diameter than said smaller sprocket means; and
thrust means for pivoting said larger sprocket means through a predetermined arc, thereby moving said smaller sprocket through a greater arc which is sufficient to move said lift arm from underneath the body of the truck into engagement with said gate and thence moving said gate upwardly to an upper closed position.
1 Assignment
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Accused Products
Abstract
The invention is a lift for the gate of a truck, and especially a gate at the side of the truck. An L-shaped lift arm has base bars pivotally connected to an actuator mechanism beneath the bed of a truck. These arms swing to the side of the truck when extended and a lift bar on the base bars extends therefrom to engage the outside of a truck gate and the lift bar is angled from the base bars to push the gate upwardly to its closed position when the base bars are rotated to their extended position. The actuator mechanism includes two chain connected sprockets: a smaller sprocket at the base bar pivot and a larger sprocket connecting with the piston of a cylinder. The sprocket pitch diameter ratios are such that rotation of approximately 90° by the larger sprocket will effect an 180° rotation of the smaller sprocket, permitting the lift arm to swing from a fully retracted position underneath the body of the truck to a fully extended position where the lift bar closes the gate.
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Citations
13 Claims
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1. A mechanism for lifting the hinged gate of a truck or trailer body and the like, comprising:
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an actuator means carried underneath the body of the truck alongside the gate; a lift arm pivotally mounted upon said actuator means below the hinge area of said gate, to be pivoted upwardly by the actuator means to move said gate from a lower open position to an upper closed position; said actuator means including; a smaller sprocket means connected to the pivotal mounting of said lift arm; a larger sprocket means connected with the smaller sprocket means having a greater pitch diameter than said smaller sprocket means; and thrust means for pivoting said larger sprocket means through a predetermined arc, thereby moving said smaller sprocket through a greater arc which is sufficient to move said lift arm from underneath the body of the truck into engagement with said gate and thence moving said gate upwardly to an upper closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification