Fastening of the buckets and possibly also the skim cutters on c

Details Fastening of the buckets and possibly also the skim cutters on c Fastening of the buckets and possibly also the skim cutters on c

1992-08-24

1994-08-02

Reese, Randolph A.

Excavating

Digging edge

Tooth or adaptor

37452, 37446, 37189, 37 94, E02F 928, E02F 508

Patent

active

053333993

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to the fastening of the buckets and possibly also the skim cutters to cutting wheels, such as bucket wheels or under water cutting wheels, wherein the buckets and possibly also the skim cutters are exchangeably attached by way of connecting elements to the outer circumference of the cutting wheels. The buckets and skim cutters will also be generally referred to as digging tool components and the bucket wheels and cutting wheels will also be generally referred to as supporting wheels. The entire rotary structure will also be referred to as digging wheel assembly.
German Unexamined Published Patent Application 3,822,235 discloses a bucket wheel body, particularly for surface mining apparatus, which is composed of a supporting body that is rotatably mounted on the axis of the bucket wheel and is provided with a plurality of buckets that are connected with the carrier body by means of at least one ring carrier. The ring carrier is disk-shaped and, seen in the circumferential direction, is provided with two superposed approximately horizontally extending flanges that are connected with the ring carrier outside of the bucket wheel body. By means of connecting elements, the front and rear regions of the buckets provided at the ring carriers are releasably connected with the bucket wheel body.
German Unexamined Published Patent Application 3,737,893 discloses a bucket wheel bucket which has at its rear a device for preventing the buckets from being loaded with larger chunks of material (rock deflector), with the device being composed like a cage of a plurality of rods extending in the conveying direction of the bucket wheel and being disposed between the back of the preceding bucket and the next following bucket. The buckets as well as the rock deflector are fastened by way of connecting elements so that exchangeability when worn is ensured.
The drawbacks of the prior art are essentially that complicated structures must be provided on the circumference of the bucket wheel so that the buckets can be connected with it by means of the connecting elements. Such connecting elements are often formed by sleeves and pins cooperating therewith which, under certain circumstances, require much mechanical working and may deform if under certain conditions the digging forces are high so that ultimately problems arise again during the removal of the buckets. In the past, it has also been found that the reaction forces generated by the digging forces often caused the connecting elements, on the one hand, and the fastening elements, on the other hand, to break off.


SUMMARY OF THE INVENTION

It is the object of the invention to provide an improved fastening of digging tool components to the cutting (digging) wheels so that it is possible, without greater mechanical working of the fastening and/or connecting elements for the buckets and the skim cutters, to provide a simple, economical and primarily secure manner of fastening, with it being ensured that an exchange in the operating state can be effected without problems. The number of connecting elements, such as pins, sleeves or the like, should here be reduced to a minimum.
This is accomplished according to the invention in that the buckets and possibly also the skim cutters, when seen in the cutting direction, are clampable in their forward regions and supportable in their rearward region and are there arrestable by means of connecting elements.
With the combination, according to the invention, of a receiving device (socket pocket) for the forward fastening of the buckets and skim cutters with an integrated wedge fastening for the rear portion of the buckets and the skim cutters, a manner of fastening has been developed which is simple in configuration and is able to take advantage of prefabricated components which require no further working. The front, profiled regions of the buckets and of the skim cutters thus, in the course of the assembly of the buckets and skim cutters, respectively, engage in the receiving devices confi

REFERENCES:
patent: 3481057 (1969-12-01), Zink
patent: 3498677 (1970-03-01), Morrow
patent: 3509648 (1970-05-01), Smith
patent: 3913979 (1975-10-01), Strauss et al.
patent: 3968580 (1976-07-01), Lombardi et al.
patent: 4197662 (1980-04-01), McAulay et al.
patent: 4445608 (1984-05-01), Evans et al.
patent: 4768297 (1988-09-01), Rivard

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