Coupler for coupling an accessory to a dipper arm and a control system for such a coupler
First Claim
1. A quick hitch coupler for coupling an accessory to a dipper arm of a back actor, the quick hitch coupler comprising a body member adapted for coupling to the dipper arm, a fixed engaging means mounted on the body member for engaging a first one of a pair of coupling pins mounted on the accessory, a moveable engaging means mounted on the body member for engaging a second one of the pair of coupling pins of the accessory, the moveable engaging means being moveable between an engaged state with the moveable engaging means engaging the second coupling pin while the fixed engaging means engages the first coupling pin for coupling the accessory to the coupler, and a disengaged state for disengaging the second coupling pin, a latch co-operable with the fixed engaging means for retaining the first coupling pin of the accessory engaged in the fixed engaging means the latch being alternately operable in a latched state co-operating with the fixed engaging means for retaining the first coupling pin in the fixed engaging means, and an unlatched state for releasing the first coupling pin from the fixed engaging means, an urging means for urging the latch into the latched state, and a drive means acting between the moveable engaging means and the latch for urging the moveable engaging means between the engaged state and the disengaged state, and for urging the latch from the latched state to the unlatched state against the urging action of the urging means when the moveable engaging means is in the disengaged state.
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Accused Products
Abstract
A coupler for coupling an accessory to a dipper arm and a control system for such a coupler. The invention concerns a quick hitch coupler for coupling an accessory to a dipper arm of a back actor such as may be used by an earth working apparatus. The quick hitch coupler comprises a body member adapted for coupling to the dipper arm, a fixed engaging means mounted on the body member for engaging a first one of a pair of coupling pins mounted on the accessory, and a moveable engaging means mounted on the body member for engaging a second one of the pair of coupling pins of the accessory. The invention also relates to a control system for controlling the release of an accessory from any quick hitch coupler coupling the accessory to a hydraulically operable arm of a machine, operated by a pressurized hydraulic system.
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Citations
21 Claims
- 1. A quick hitch coupler for coupling an accessory to a dipper arm of a back actor, the quick hitch coupler comprising a body member adapted for coupling to the dipper arm, a fixed engaging means mounted on the body member for engaging a first one of a pair of coupling pins mounted on the accessory, a moveable engaging means mounted on the body member for engaging a second one of the pair of coupling pins of the accessory, the moveable engaging means being moveable between an engaged state with the moveable engaging means engaging the second coupling pin while the fixed engaging means engages the first coupling pin for coupling the accessory to the coupler, and a disengaged state for disengaging the second coupling pin, a latch co-operable with the fixed engaging means for retaining the first coupling pin of the accessory engaged in the fixed engaging means the latch being alternately operable in a latched state co-operating with the fixed engaging means for retaining the first coupling pin in the fixed engaging means, and an unlatched state for releasing the first coupling pin from the fixed engaging means, an urging means for urging the latch into the latched state, and a drive means acting between the moveable engaging means and the latch for urging the moveable engaging means between the engaged state and the disengaged state, and for urging the latch from the latched state to the unlatched state against the urging action of the urging means when the moveable engaging means is in the disengaged state.
Specification