Earth working – With means to facilitate mounting of implement on motor vehicle
Patent
1995-10-25
1997-07-01
Melius, Terry Lee
Earth working
With means to facilitate mounting of implement on motor vehicle
172273, 172275, 414723, A01B 7100, E02F 300, E02F 396
Patent
active
056427859
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an implement coupling for excavators or loaders.
2. Description of the Prior Art
Implement couplings of this type are used to shift quickly and easily between different implements, for instance between excavator buckets with different widths or between excavator and loader buckets. The implement coupling may comprise an either manually operated shift mechanism requiring that the operator leaves the vehicle cabin, or a remote controlled shift mechanism, which may be operated from the cabin, for instance by means of a hydraulic hand pump.
At both manually and hydraulically operated implement couplings good security is required against failure and/or mis-operating of the locking function of the shift mechanism of the implement coupling.
SUMMARY OF THE INVENTION
The invention provides loaders and which by simple provisions makes it possible to obtain extraordinarily good security against unintended disengagement of the implement.
The implement coupling according to the invention is distinctive in that the swing arm mechanism, opposite the locking splice, comprises a basic joint pivotally arranged on a central, fixed pivot axle, and the basic joint via a bent axle at a distance from the pivot axle being pivotally connected with the locking splice by means of an intermediate arm. The basic joint has a projecting arm part, which swings into a position mainly parallel with the intermediate arm, so that an end part of the projecting arm part is placed behind the locking splice, when in locked engagement with the hook-shaped locking part of the implement, and when the bent axle is placed in a dead center position at the opposite side of the connecting line between the locking splice. The pivot axle, and that the basic joint for operating of the shift mechanism furthermore are connected with a manual operating handle and/or a hydraulic activiation cylinder. By simple technical provisions extraordinarily good security against unintended disengagememt of the implement by releasing the locking function of the coupling is hereby obtained. Appropriately the implement coupling according to the invention is such provided with a pressure cylinder with a piston rod, a piston and a powerful pressure spring inserted in the intermediate arm.
When the implement coupling according to invention manually operated, it appropriately may be such provided with the operating handle being connected with the projected arm part at the side opposite the intermediate arm, and the operating handle has a pivoting locking pawl for locking the operating handle, when it is swung in parallel with the intermediate arm, in the locking position of the implement coupling.
The implement coupling according to the invention, when hydraulically operated, advantageously may be provided with a piston rod of the hydraulic activation cylinder connected with an activiation arm part of the basic joint projecting from the latter opposite the projecting arm part. That side opposite of the intermediate arm by means of the end part engages behind the locking splice when the activation arm part is led to the rear by the piston rod. The hydraulic activation cylinder is provided with an internal pressure spring affecting the piston rod in the direction towards the activation arm part that is maintaining the locking function of the implement coupling if the hydraulic pressure should disappear.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail in the following with reference to the drawing, in which:
FIG. 1 shows a plane partial view, seen from above of an embodiment for an implement coupling according to the invention; while
FIG. 2 shows a side view, partly in section of the implement coupling shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The implement coupling 2, as illustrated in FIGS. 1 and 2, comprises two parallel bearing plates 4 with bearings 6 and 8 by means of which the implement coupling 2 is intended to be mounted at an outer
REFERENCES:
patent: 3985249 (1976-10-01), Aker et al.
patent: 4067467 (1978-01-01), Datta et al.
patent: 4203238 (1980-05-01), Bangert et al.
patent: 5332353 (1994-07-01), Arnold
patent: 5382110 (1995-01-01), Perotto et al.
patent: 5415235 (1995-05-01), Gebauer
Melius Terry Lee
Pezzuto Robert
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