Scraper bail stop assembly

Land vehicles – Wheeled – Articulated vehicle

Patent

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Details

B60D 1004

Patent

active

043503632

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to a bail stop assembly useful with vehicles of the type adapted for interconnection by a pivotal bail, such as the bail of a push-pull scraper.
2. Background Art
Vehicles such as scrapers may include pivotally mounted bails for use in "push-pull" operations. A bail mounted on the front of one scraper is lowered about a hook on the rear of another scraper. The paired scrapers assist each other in loading operations. After loading, the bail is raised, the scrapers separate, and each may proceed with hauling or spreading operations.
Such bails are normally raised and lowered by power means such as fluid cylinders. It is usual to have a stop assembly for the bail which stops the bail in a raised position. If the bail did not have a stop assembly, it could be possible to further raise the bail.
Further raising of the bail, when a fluid cylinder is in association therewith, may lead to bottoming out of the fluid cylinder. Also, as an individual scraper is operated, for example with the bail in a raised position during travel to and fro, obstacles are occasionally encountered which snag, or unevenly load, the bail. If such an uneven load is imposed upon the fluid cylinder, rather than upon the cylinder frame, the cylinder rod of the fluid cylinder could be damaged.
The prior art stop assemblies have been found unsatisfactory. For example, stop assemblies have been known which have included a pair of rearwardly inclined stops each welded to end portions of the bail near the pivotal mounting points thereof, and which stop the bail from further raising when the stops engage the scraper frame. Welding of these stops has frequently led to distortion of the assembly, which has made the timing for bail stopping difficult. That is, the stops have tended not to engage the scraper frame simultaneously.
Also, the prior art stop assemblies have frequently presented pinch-points between the bail stop and the vehicle frame. It has thus been possible for objects such as tools or the like which are accidentally interposed between the bail stop and the vehicle frame to be caught therebetween during raising of the bail.


DISCLOSURE OF THE INVENTION

The present invention is directed to overcoming one or more of the problems as set forth above.
In one aspect of this invention, a vehicle has a bail pivotally mounted in an upper portion of a vertical pocket of a bifurcated bracket for movement between lowered and raised positions. The bail has a surface defined thereon that varies the horizontal dimension of an open top of the pocket upon pivoting of the bail. Means are provided on the bail for engaging a stop member mounted in the bracket to stop the bail at its raised position.
In another aspect of this invention, the engaging means is composed of a softer material than the pin which will wear into conformation with the pin through repeated engagements therewith.
Thus, engagement of the fixed pin with the means for engaging provides a positive, shielded stop for the bail. This protects a fluid cylinder or the like, used to raise and lower the bail, from damage. The means for engaging preferably wears into conforming engagement with the pin. Accordingly, a pair of the stop assemblies (at each end of the bail) substantially overcome the timing problems previously encountered.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevational view, partially broken away and sectioned, of portions of paired push-pull scapers, which illustrates an embodiment of the present invention;
FIG. 2 is a plan view of a bail of one of the paired push-pull scrapers; and
FIG. 3 is an enlarged cross sectional view, taken along line III--III of FIG. 2.


BEST MODE FOR CARRYING OUT THE INVENTION

Referring to FIG. 1, a rear portion 10 of a push-pull scraper 12 has a pulling hook 14. A front portion 16 of another push-pull scraper 18 includes a bail 20. The bail 20 is pivotally mounted at eye portions 22 and 24 thereof to the front portion 16 of scraper 18. (FIG. 1 illustrates only the eye portion

REFERENCES:
patent: 1329048 (1920-01-01), Hoover
patent: 3048934 (1960-09-01), Hancock
patent: 3307578 (1967-03-01), Chaloka
patent: 3314341 (1967-04-01), Schulin
patent: 3474548 (1969-10-01), Miller
patent: 3847416 (1974-11-01), Hicks
patent: 3861736 (1975-01-01), Rossler
patent: 3867750 (1975-02-01), Bleyker
patent: 3977699 (1976-08-01), Wagatsuma
patent: 4018452 (1977-04-01), Wagatsuma
patent: 4088340 (1978-05-01), Joyce
patent: 4109547 (1978-08-01), Jacobson
"Special Instruction", of Caterpillar Tractor Co., 5-1978.

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