Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1980-07-10
1982-08-10
Kazenske, Edward R.
Material or article handling
Vertically swinging load support
Shovel or fork type
91358A, 74519, 172466, E02F 386
Patent
active
043435882
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to a linkage means for transferring a mechanical signal across a pivot axis connecting a first member to a second member and more particularly to a linkage means for a bucket positioner system for a loader vehicle.
BACKGROUND ART
Conventional loader vehicles are adapted to perform various digging, loading and carrying operations during a cycle of loader operation. During certain phases of the loading operation, such as rack-back of the bucket after it has been loaded, it is desirable to provide means to continue the rack-back action, once such action is initiated by the operator, and to stop such action automatically when the bucket arrives at a predetermined position. Such automatic operations are generated typically by devices called, respectively, detent means and detent release means. They allow an operator to be free to direct his attention elsewhere, as needed. Release means have included various cable coupling schemes for transferring a detected degree of extension of a tilt cylinder rod to a detent release control means. Such coupling structures generally include flexible control cables that couple, either hydraulically or mechanically, control signals to the detent release control means. Flexibility is required because the tilt cylinder pivots with respect to the loader vehicle operator controls.
One particular linkage means for transferring a signal across the pivot axis between the tilt cylinder and the frame which does not utilize a flexible control cable is set out in U.S. Pat. No. 4,020,963, issued May 3, 1977 to Carl W. Carter. In the linkage means of that patent, a circular cam, having a centerline generally in line with the pivot axis between the cylinder and the frame, is carried by a first lever which is pivotally mounted relative to the cylinder, with the cam surface bearing against a coacting surface on a second lever which is pivotally mounted relative to the frame. In such apparatus, the adjustment of the linkage is provided by a bolt which extends through a tapped hole in the first lever. The sliding contact between the bolt and the lever can cause the linkage to bind. Also, since the kickout occurs at the maximum movement of the roller, sufficient force is not always provided to overcome such binding and to transmit movement to the second lever. Further, the location of the bolt is such that adjustment is not easily made.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, an improvement is provided in an apparatus having first and second members which are pivotally mounted relative to one another about a pivot axis, the first member having first and second operating conditions. The apparatus has linkage means for transmitting a mechanical signal across the pivot axis, which linkage means has a first link structure pivotally mounted relative to the first member and defining a generally circular cam surface, the first link structure being pivotable to first and second positions relative to the first member. The apparatus also has a second link structure having first and second positions and being pivotally mounted relative to the second member, the second link structure defining a coacting surface which the cam surface contacts with the first link structure in its first position to define the first position of the second link structure. Means are provided for moving the second link structure to its second position in response to movement of the first link structure to its second position. Mechanical signal originating means serves for moving the first link structure to its first and second positions in response to the first member being respectively in its first and second operating conditions. The improvement of the present invention comprises a roller having a center and being mounted at its center to the first link structure, the roller defining the circular cam surface; a generally U-shaped member having a pair of
REFERENCES:
patent: 4020963 (1977-05-01), Carter
patent: 4024974 (1977-05-01), Hodge
Caterpillar Tractor Co.
Kazenske Edward R.
Siemens Terrance L.
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