Excavating – Railway graders – Side former
Patent
1988-09-23
1989-09-12
Eickholt, Eugene H.
Excavating
Railway graders
Side former
37108R, 37DIG20, E02F 500
Patent
active
048647462
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus for compensating a stop position of a bucket of a loader such as a tractor shovel and the like, and more particularly to an apparatus for compensating a stop position of a bucket in a bucket leveler device for the loader such as the tractor shovel and the like, through which apparatus the stop position of the bucket of the loader is automatically compensated so that the bucket is kept substantially horizontal even when an engine of the tractor shovel and the like is operated in any condition (or at any engine speed).
BACKGROUND OF THE INVENTION
In loading operation of the loader such as the tractor shovel and the like, the earth and sand are loaded into a dump trucks, hoppers and the like. Namely, the earth and sand shoveled by a bucket of such loader are discharged into the dump truck, hopper and the like. In case that the loader is a tractr shovel, after completion of discharging of the earth and sand, an operator of the tractor shovel backs the tractor shovel. At this time, in order to efficiently perform shoveling of the earth and sand in a minimum of time in the next cycle, the operator moves a boom of the tractor shovel downward, while he so changes the direction of the bucket that the bucket having been tilted downward for discharging the earth and sand is tilted back to be kept horizontal so as to facilitate the shoveling operation of the bucket conducted along the ground in the next cycle.
Namely, after completion of discharging of the earth and sand, the operator must confirm a rearward safety of the tractor shovel when he backs the tractor shovel. In addition to such confirmation of the rearward safety of the tractor shovel, the operator must confirm a frontward safety of the tractor shovel in an operation in which the bucket is tilted back to be kept horizontal at a time when the bucket is brought into contact with the ground. Consequently, at this time, the operator of the tractor shovel must perform simultaneously a plurality of actions such as: a steering action of the tractor shovel; controlling actions of levers for lowering a boom; and controlling actions for stopping a tilting operation of the bucket so as to keep the bucket horizontal. Therefore, the operator of the tractor shovel must be a skilled one. In addition, in the above tilting operation of the bucket, since the bucket is tilted back to be kept horizontal through visual observation of the operator, the horizontal position of the bucket varies in each cycle to make an operational accuracy of the shoveling of the bucket poor. This is disadvantageous to the tractor shovel.
As is already well known, in order to eliminate such disadvantage, a bucket leveler device has been employed in the tractor shovel.
Such conventional bucket leveler device is constructed of: a signal issuring portion "A" shown in FIGS. 1 and 2 of the accompanying drawings; and a bucket control lever return mechanism portion "B" shown in FIG. 1.
As shown in FIGS. 1 and 2, in the signal issuing portion "A" of the bucket leveler device: a limit switch 33 is mounted on a side portion of a cylinder 31 of a bucket cylinder unit 27 for controlling the position of a bucket 23 with respect to a boom 22; and a position detecting element 34 is so mounted on a piston rod 29 of the bucket cylinder unit 27 as to turn on the limit switch 33 at a time when the bucket cylinder unit 27 is extended by a predetermined length, whereby the limit switch 33 having been turned on issues a signal.
On the other hand, as shown in FIGS. 1 and 3, in the bucket control lever return mechanism portion "B" of the bucket leveler device a guide plate 44 is mounted on a bucket control lever 43. The bucket control lever return mechanism portion "B" is also provided with a lever detent mechanism "C" in which: a roller 50 is pressed against the guide plate 44 under the influence of a resilient force exerted by a tension spring 49; the guide plate 44 in its contour and the tension spring 49 in its stiffness are so determined as to
REFERENCES:
patent: 3712404 (1973-01-01), Walquist
patent: 3786871 (1974-01-01), Long et al.
patent: 4045893 (1977-09-01), Feinzilber
patent: 4081033 (1978-03-01), Bulger et al.
Eickholt Eugene H.
Kabushiki Kaisha Komatsu Seisakusho
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