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1. (WO1980000088) RELEASABLE CORNER TOOTH ASSEMBLY
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters
Description

Releasable Corner Tooth Assembly

Technical Field
The. present invention is related to an earth-moving implement, and more particularly to a releasable corner tooth assembly therefor.

Background Art
Each corner of a work implement, such as a
loader bucket, often has a hardened earthworking adapter and tip assembly thereat in order to increase the work
capabilities of the implement and to also prolong the
service life of the implement at the' corners. As can
be expected, relatively large working forces are generated upon the releasable tip, and the adapter conven-tionally transmits these forces rearwardly into the
sidewall member and the cutting edge. Exemplifying the art in this area are the following patents: U.S. Patent
No. 3,621,594 issued November 23, 1971 to F.C. Hahn,
et al; U.S. Patent No. 3,812,608 issued May 28, 1974 to
T.A. Ratkowski; U.S. Patent No. 4,007,550 issued Febru- ' ary 15, 1977 to V.A. Stepe; and U.S. Patent No. 4,071,967 issued February 7, 1978 to R. Klett.
Such tip supporting adapters are usually re-leasably secured to the implement by one or more bolts , and in order to relieve the shearing forces on the
bolts it has been heretofore deemed necessary in many
cases to provide shear blocks or the like integrated
into the corner constructions of the implement. These
shear- blocks, shown for example in the- forementioned--------—-U.S. Patent 4,071,967, require additional costly manufacturing steps and are in the way when the earth-working adapters and tips are not needed on the implement.

Another problem that has been experienced with such constructions is that downward working forces of relatively high magnitude on the adapter and the tip are often transmitted directly upon the cutting edge.
This has resulted in shortening the desired service life of the cutting edge.
Frequently, in order to minimize some of the aforementioned problems, the construction of the adapter and associated retaining devices becomes so complex so that not only is the cost undesirably high, but also the service time required for field replacement is excessive.
The present invention is directed to overcoming one or more of the problems as set forth above.

Disclosure of Invention
In accordance with one aspect of the present invention, the releasable corner tooth assembly includes an implement having a sidewall member, a step defined in the sidewall member, and a cutting edge connected to the sidewall member. The assembly further includes an adapter having a pair of inner and outer mounting portions defining a first slot therebetween, a bottom portion connected to the outer mounting portion and defining a second slot with the inner mounting portion. With this construction the first slot straddles the sidewall member and the second slot straddles the cutting edge. Advantageously, a projection defined on the adapter transmits a portion of a working force on the adapter into the step of the sidewall member, and a fastening device releasably connects the adapter to the implement and transmits another portion of the working force into the sidewall member.
In another aspect of the invention, the adapter has an elongate body having a forward nose portion and

OM a rear leg portion. A pair of laterally spaced outer and inner mounting portions are formed on the leg portion and define a first slot. A bottom portion formed on the leg portion extends laterally inwardly to define a second slot with the inner mounting portion. The adapter further defines a pair of laterally aligned openings in the outer and inner mounting portions, and a projection having first and second connected surfaces is located forwardly of the first slot.

Brief Description of Drawings
FIG. 1 is an exploded and diagrammatic isometric view of a releasable corner tooth assembly constructed in accordance with an embodiment of the present invention, including a fragmentary inside portion of a front corner of a loader bucket.
FIG. 2 is a diagrammatic, side elevational view of the corner tooth assembly shown in FIG. 1, with portions broken open and sectioned in order to better illustrate details of construction thereof.
FIG. 3 is a diagrammatic vertical cross sectional view through the corner tooth assembly as taken alqng line III-III of FIG. 2.
FIG. 4 is a diagrammatic top plan view of the corner tooth assembly illustrated in FIGS. 1-3.

Best Mode for Carrying out the Invention
FIG. 1 illustrates a corner tooth assembly 8 constructed in accordance with the present invention and including a portion of one of the front corners of an earthmoving implement such as a loader bucket 10 having a normal forward longitudinal direction of.
working movement. The implement has an upright side-wall member 12 and a horizontally disposed cutting edge 14 connected to the lower edge of the sidewall as by inner and outer weld joints 16. Advantageously, the sidewall member 12 has a fastener-receiving cylindrical opening 18 laterally therethrough and a forwardly and upwardly facing step 20. Preferably, the step 20 has a substantially upright or vertical face

22 and an intersecting, forwardly descending or inclined face 24.
In general, the corner tooth assembly 8 includes an adapter 26 having a flat bottom skid surface 27, fastener means or a fastening device 28 for releas-ably connecting the adapter to the implement 10, and a conventional hardened earth penetrating tip 29 which is releasably connected to the adapter by a standard pin assembly 30.
More specifically, as shown in FIGS. 1 and

2, the adapter 26 has an elongate body 31 having a longitudinal axis 32 that is inclined or that descends in the forward direction relative to the bottom surface 27. A forward nose portion 33 and a rear leg portion 34 are formed integrally with the body. A pair of laterally spaced outer and inner mounting portions "35, 36 are formed on the rear leg portion and define a first slot 38 between them as is shown best in FIG. 4. A bottom portion 40 is integrally con-nected to the bottom of the outer mounting portion 35 and extends laterally inwardly to define a second slot 42 with the inner mounting portion 36 as shown best in FIG. 3. In this way it is clear that the. first slot 38 relatively closely straddles the sidewall member 12, for example, having only about 1 mm clearance, and the second slot 42 relatively loosely straddles the cutting edge 14.
Referring to FIG. 3, the adapter 26 has first and second laterally aligned openings 44 and 46 through the outer and inner mounting portions 35, 36 respectively for receiving the fastener means 28. The first opening 44 includes an outer annular conical surface 48, that connects with an inner surface 50 of polygonal cross section, and the second opening 46 includes an inner cylindrical bore 52, an outer enlarged counter-bore 54, and an intermediate annular conical surface 56 therebetween. Preferably, the fastener means 28 includes a single plow bolt 58 which extends laterally inwardly through the openings 44, 18 and 46, and a nut 60 is screw threadably installed on the inner end
thereof. A polygonal portion 62 of the bolt is advan-tageously received in the corresponding polygonal inner surface 50 to prevent rotation of the bolt during assembly or disassembly of the nut 60 and the adapter 26 to the implement 10. Moreover, conically tapered portions 64, 6-6 on the bolt and nut respectively contact the surfaces 48, 56 to permit relatively positive anchoring of first force transmitting means or a cylindrical bearing surface 68 of the bolt on the outer and inner mounting portions 35, 36 of the adapter. In this regard, the diametral clearance between the bearing surface 68 and the opening 18 is relatively tight, for example, 1.6 mm.
As shown in FIGS. 2 and 3, the adapter 26 has second force transmitting means 70 for transferring certain external working forces upwardly into a bottom surface 72 of the cutting edge 14. Preferably, the second force transmitting means, includes an upstanding bearing surface or pad 74 formed on the upper inside part of the bottom portion 40 of the adapter. As shown in FIG. 2, a third force transmitting means 76 is
preferably provided for transferring certain external working forces upwardly into the bottom surface of the cutting edge at a spaced location rearwardly of "the " second force transmitting means 70. The third force transmitting means - 76 preferably includes an upstanding bearing surface or pad 78 spaced rearwardly from the bearing pad 74.

In accordance with a major aspect of the invention, the corner tooth assembly 8 includes a fourth force transmitting means or projection means 80 for transmitting certain working forces on the adapter 26 primarily into the step 20 of the sidewall member 12. As shown best in FIG. 2, the projection means 80
preferably includes a substantially upright or vertical surface 82 and an intersecting, forwardly descending inclined surface 84, which surfaces are located gen-erally forwardly of the first slot 38 or at the base of the first slot in the adapter. Thus, in use, the surface 82 is contiguous with the corresponding face 22 of the step, and the surface 84 is contiguous with the corresponding face 24 of the step. Moreover, as shown best in FIGS. 2 and 4, an embossment 86 extends integrally outwardly from the side of the adapter to provide increased sectional strength of the outer mounting portion 35 at the base of the first slot 38.

Industrial Applicability
Horizontal rearward forces F, imposed on the tip 29 from the usual earthmoving operations, as shown in FIG. 2, are transmitted to the adapter 26 and primarily directly against the sidewall member 12 of the implement 10 by the fourth force transmitting means 80. Particularly, as depicted by reaction force arrow F. ' , such forces are transmitted substantially fully by the abutment of upright surface 82 against the upright face 22. However, some relatively minor degree of force transmitting reaction can also be experienced by the first force transmitting means 68 at the bolt 58.
Upwardly directly forces F„ imposed on the tip 30 and tending to rotate the adapter 26 in a
counterclockwise direction when viewing FIG. 2 are transmitted from the adapter 26 to the implement 10 primarily by the second force transmitting means 70, and secondarily to a relatively limited degree by

O the first force transmitting means 68. Specifically, as depicted by the respective reaction force indicating arrows F_ ' and F_ ' ' , such forces are transmitted primarily by the bearing pad 74 into the bottom 72 of
the cutting edge 14, and secondarily by the reaction of the bolt 58 against the sidewall member 12. In
this regard, it is to be appreciated that the central bearing surface 68 of the bolt is relatively closely received in the opening 18 in the sidewall member 12 to better transmit such reaction forces into the implement.
Furthermore, downwardly directed forces F_ imposed on the tip 30 and tending to rotate the adapter in a clockwise direction when viewing FIG. 2 are
transmitted from the adapter 26 to the implement 10
primarily by the fourth force transmitting means 80, and secondarily by the first force transmitting means
68. More particularly, as depicted by the reaction
force indicating arrows F ' and F '*, such forces are transmitted primarily by the abutment of the inclined surface 84 with the inclined face 24 and secondarily by the reaction of the bolt 58 against the sidewall
membέr 12. It is of major importance to note that
downward forces upon the adapter are not transmitted to the cutting edge 14 so that its service life is
significantly extended. Reference is made, for example, to the vertical clearance provided between the cutting edge 14 and the inner mounting portion 36 as designated by the identifying letter C in FIG. 3 which prevents the transmission of such undesirable loading.
The third force transmitting means 76 can
be useful, for example, should upward forces F. be -experienced at the rear of the adapter 26. In that
case, the bearing pad 78 can abut the bottom surface
72 of the cutting edge 14 to simultaneously share the reaction of the first force transmitting means 68 against the sidewall member 12 and the second force transmitting means 70 against the bottom surface of the cutting edge. Hence, the third force transmitting means 76 can serve to protect the bolt 58 from un-desirably high loads.
While in the instant example a separate
tip 29 is releasably connected to the adapter 26 by the quick-release pin assembly 30, we contemplate that the nose portion 33 can be enlarged to provide an
integral, forwardly extending hardened tip on the
adapter for earth penetrating purposes without de-parting from the spirit of the present invention.
Other aspects, objects and advantages will become apparent from a study of the specification, drawings and appended claims.

OMPI