US3678605A

US3678605A - Tooth mounting means for earth working implements

Info

Publication number: US3678605A
Application number: US8236A
Authority: US
Inventors: Derek Arthur Prime
Original assignee: JC Bamford Excavators Ltd
Current assignee: JC Bamford Excavators Ltd
Priority date: 1969-02-13
Filing date: 1970-02-03
Publication date: 1972-07-25
Anticipated expiration: 1989-07-25
Also published as: IL33809A; DE2004922A1; AU1126670A; GB1292612A; FR2035325A5; IL33809A0

Abstract

An excavator bucket or similar earth working implement having an earth engaging blade, a tooth removably mounted on the blade and there being releasable clamping means such as a wedge or engageable pin engaged between the tooth and the blade at a position spaced inwardly from the edge to secure the tooth to the blade or other implement.

Description

United States Patent Prime [4 1 July 25, 1972 s41 TOOTH MOUNTING MEANS FOR 1,620,132 3/1921 Psilander ..37/142 R EARTH WORKING [MPLENIENTS 2,259,456 10/ 194i Crawford .....37/ I42 R 3,006,089 10/1961 Johnson .....37/l42 R [721 England 2,904,908 9/1959 Ratkowski ..37/|42 R 73 Assignee; Bunion] Baum" u n d 2,092,311 9/ i937 l-losmer et al ..37ll42 X Rocester, Uttoxeter, England 3,426,459 2/1969 Petersen ..37/l42 R 2,846,79l 8/1958 Hosmer et al. ..37/l42 R [221 Fm 3,509,648 5/1970 Smith ..37/142 R 211 App. 3,236 2,568,075 9/]951 Launder ..37/l42 A 2,472,892 6/l949 George ..37/i42 R [30] Foreign Application Priority Data Primary Examiner sdgax Feb. 3, 1970 Great Britain ..7,743/69 Attorney-Owen. h m & Eri ks n 52 us. c|..... '1, 37/142 A AB TRAC [51] Int. Cl. ..E02i 9/28 An excavator bucket or similar emh workin g Implement hav- [58] Field of Search ..37/14l, 142, 299/91 ing an an engaging blade a moth mmovably mounud on the blade and there being releasable clamping means such as a References Cm wedge or engageable pin engaged between the tooth and the n- STATES PATENTS blade at a position spaced inwardly from the edge to secure the tooth to the blade or other implement. 2,403,078 7/ 1946 Hettelsater ..299/9l X 1,220,186 3/1917 Chambers ..37/l42 R 12 Claims, 6 Drawing Figures is 6 le '5 Patented July 25, 1972 .3 Sheets-Shout 1 INVENTOR DEREK ARTHUR PRME ATTORNEYS Patented July 25, 1972 2 Sheets-Sheet 2 F/GlL INVENTER DEREK ARTHUR PRIME ATTORNEYS TOOTH MOUNTING MEANS FOR EARTH WORKING IMPLEMENTS BACKGROUND OF THE INVENTION I Field of the Invention 2. Description of Prior Art This invention relates to earth working implements having at least one earth working tooth provided thereon. For example, the bucket of a backhoe type excavator may have a row of outwardly projecting teeth provided along one edge of its open mouth, such teeth being secured in spaced apart relationship along a front edge of the bucket. In addition, other earth working implements such as scrapers or loader buckets may have similar teeth provided therealong. Also, certain specialized tools may have a single large size tooth provided thereon.

The tooth or teeth above referred to encounter very ardous conditions when in use and are subject to a great deal of wear which can lead to the necessity for frequent replacement of the tooth or teeth which become worn and damaged and thus provision must be made for replacement of the tooth or teeth.

An object of the invention is to provide a new or improved means for removably securing such a tooth or teeth to an earth working implement. A further object of the invention is to provide a new or improved means for removably securing such a tooth or teeth to an earth working implement in which the position of the tooth or teeth may be adjusted.

SUMMARY OF THE INVENTION According to the present invention we provide an earth working implement having an earth engaging blade bounded by an earth engaging edge and a tooth removably mounted on said blade and there being releasable clamping means urging a part of the tooth into engagement with said blade at a position spaced inwardly from said edge to secure the tooth to the implement.

The clamping means may act directly on, and be positioned in between, a part of the blade and a part of the tooth.

The clamping means for the tooth may comprise a wedge member.

The infpiement may be a bucket and the blade part may be provided in the form of a toe plate on one side of the mount of the bucket.

Alternatively, the implement may be a scraper member, such as a scraper or bulldozer blade, said earth engaging blade being provided by a portion of said scraper member which, in use, engages the ground.

A plurality of teeth may be removably mounted on the blade.

BRIEF DESCRIPTION OF THE DRAWINGS Two embodiments of the present invention will now be described in more detail by way of example with reference to the accompanying drawings wherein FIG. I is a perspective view of part of an earth working implement and tooth according to the invention,

FIG. 2 is a cross-sectional view on the line 2-2 of FIG. 1,

FIG. 3 is a plan view of part of an earth working implement and tooth according to another embodiment of the invention,

FIG. 4 is a side elevation, partly in section, of the implement of FIG. 3, and,

FIG. 5 is a transverse cross-section through two alternative pin members, and,

FIG. 6 is a diagrammatic perspective view, to a reduced scale, of an earth working implement according to the invention.

DESCRIPTION OF THE PREFERRED EMBODiMENTS In the present example a bucket for a backhoe type excavator is described as the earth working implement but it should be appreciated that the present invention may be applied to other earth working implements such as buckets for front loaders or scraper blades or bulldozer blades or the like as well as for certain specialized tools in which a single tooth of relatively large dimensions is present in cooperation with an earth engaging blade.

in the case of a backhoe type excavator bucket the bucket is in the form of a steel box of, generally rectangular cross-section, closed at one end and having an open mouth at the other end. One side of the box at the open end constitutes an earth engaging blade which, in use, digs into the earth to be moved. This blade may be formed integrally with the remainder of the bucket or may be in the form of a toe plate secured, for example, by welding or bolting, to the above mentioned side of the box.

The earth engaging blade, however it is formed, is usually provided with a tapered portion at its outer end, which terminates in an earth engaging edge.

It will be appreciated that in practice a truly geometrical edge is not always achieved and the word "edge" as used herein should be construed to cover not only a geometrical edge but also a surface of relatively narrow width.

The bucket of a backhoe excavator is normally provided with a number, for example four or five, of teeth which project outwardly from the above discussed earth engaging edge of the blade part.

These teeth are subject to considerable wear in use and thus it is necessary to provide a facility whereby they may be relatively easily removed and replaced.

It is also advantageous to be able to position the teeth where desired along the length of the blade part. Similar desiderata are present in connection with the other earth working implements discussed above.

In the embodiment illustrated in FIGS. 1 and 2, only part of an earth working bucket 9 is illustrated, illustrating part of the hereinbefore described earth engaging blade which, in this case, is constructed as a toe plate. The blade is illustrated generally at 10 and a tooth, to be removably secured thereto, is illustrated generally at II. The tooth I1 is of tapered configuration, terminating in a chisel shaped point l2 and is made of hardened steel. A slot 13 is formed in the tooth ll of a configuration to provide a socket part to receive the front edge portion of the blade 10. The slot or socket part 13 has a front tapered portion 14 to receive the tapered edge of the blade ID.

A passage 15 is formed in the tooth 11 and, as best shown in FIG. 2, extends into the slot 13 to form a portion 16 of the slot 13 of greater height than the remainder of the slot.

A steel wedge member 17 is provided and is insertable through the passage 15 into the portion 16 of the slot I3 so as to engage between the upper surface 18 of the portion 16, which surface 18 is inclined to the lower surface 20 of the slot 13, and the upper surface I9 of the blade 10, thereby urging the lower surface 20 of the tooth 11 against the lower surface 21 of the blade 10, thereby securing the tooth ll to the blade 10.

A recess 22 is formed in the lower surface 21 of the blade and extends longitudinally thereof parallel to the front edge 23 of the blade 10. The tooth 1] is formed with a correspondingly shaped projecting portion 24 which engages within the recess 22 and prevents movement of the tooth it away from the blade [0 in a direction normal to the front edge 23 of the blade.

in the present example the recess 22 extends along the whole length of the blade 10 and so the tooth ll may be secured to the blade 10 at any position therealong. If desired, however, the recess 22 may only extend for a part of the length of the blade 10 and in this case the tooth ll could only be secured to the blade 10 at any desired position along this length.

It should be appreciated that if it is not required to provide a facility to secure the tooth 11 at any desired position along the blade 10 the groove 22 could be provided merely at the position at which it is desired to secure the tooth or teeth to the blade.

If desired, upstanding ribs 30 may be provided on one or both surfaces of the blade 10 at positions where it is desired to secure the tooth or teeth to prevent lateral movement of the teeth. The upstanding ribs may be in the form of projections of weld and may be of relatively small height.

If desired, an alternative form of clamping means may be provided.

Referring now particularly to FIGS. 3 and 4, this embodiment is very similar to the embodiment described above, except for the clamping means to secure the tooth 111 to the blade 110. The tooth 111 is again of tapered configuration, having a chisel shaped point 112. A slot 113 is formed in the tooth 111 of a configuration to provide a socket part to receive a front portion of the blade 110. The slot or socket part 113 again has a tapered front portion 114 to receive the tapered end of the blade I Ill.

The blade 110 has a front edge portion 115 of greater thickness than the remainder of the blade 110 so as to provide a shoulder 116 therebetween. The shoulder 116 is of arcuate form.

A recess 117 of a shape to accommodate a pin member 119 is provided in the upper surface 118 of the slot 113 in the tooth 111. A pin member I19 comprising two semicircular metal portions 120 secured together by bonding to a resilient member 111, for example rubber, is engaged in the recess 117 and abuts against the arcuate shoulder I16 and thus urges the lower surface 121 of the slot I13 against the lower surface 122 of the blade 110 and also urges the tapered part 123 of the blade I 10 into the tapered portion I14 of the slot I13, thereby clamping the tooth 111 to the blade 110.

Again the shoulder 116 may be provided to extend along either the whole length of the blade 110 or over an extended but lesser portion of the length of the blade, or merely in localized portions if no adjustment of the position of attachment of the teeth 11 I to the blade 110 is required.

In the present example the pin 119 is made of two dissimilar parts 120, the one part 120 which engages the shoulder 116 is of the same half cylindrical configuration over the whole of its length, as best shown in FIG. 3. The other half 120 of the pin 119, however, is of reduced cross-section intermediate its end, as indicated at 124 so that outwardly projecting shoulders 125 are provided which engage the side surfaces 126 of a reduced width portion 127 of the tooth 111, thereby preventing lateral movement of the pin 119 in use.

in order to facilitate insertion of the pin 119 the end portions of the half of the pin of reduced cross-section intermediate its end are tapered, as indicated at 128.

Although in this example a shoulder 116 has been described as the part of the blade H engaged by the pin 117, ifdesired, instead of a shoulder 116, the blade 110 could be provided with a recess of a similar configuration to the recess 117 provided in the tooth l I 1.

Instead of the two part pin shown at 119 any other form of resiliently expandable member may be used, for example a tension pin such as the pin shown at A in P16. 5, which is of circular cross-section and has an axially extending slot A, or a spiral pin such as the pin shown at B in FIG. which is of spiral form.

in all cases the pin may be provided with shoulders similar to that described in connection with the pin 119 but this may not be essential in practice because the inherent resilience of the pins may be sufficient to prevent lateral movement of the pins out of engagement with the blade and tooth.

it will be appreciated that both embodiments described hereinbefore provide a very convenient way of removably securing a pin to an earth working implement and that, if desired, the means may be utilized to enable securing of the tooth at any position longitudinally of the blade of the earth working implement merely by providing the shoulder 116 or groove 22 along that portion of the blade in which adjustment is required.

What I claim then is I. An earth working implement comprising,

an elongated imperforate earth-engaging blade bounded by an earth-engaging edge,

at least one tooth mounted on said blade, said tooth having a rear bifurcated portion forming a socket to receive the edge portion of the blade therein,

said tooth having a forwardly facing wall formed with an opening therethough leading into the socket,

clamping means in the opening and in bearing contact with a wall of the socket and an adjacent surface of the blade to clamp said tooth to said blade,

said blade being of constant cross section substantially along its entire length and forming an elongated toothreceiving portion whose length is greater than the width of said tooth,

said socket being of constant cross section corresponding to that of the edge portion of the blade,

said clamping means being inset-table through said opening to bear directly against said blade at any position throughout said blade length, whereby said tooth may be clamped to said blade at any desired position throughout said tooth receiving length of said blade when said clamping means is retained within said recess.

2. An earth working implement according to claim 1 in which the clamping means comprises a wedge member.

3. An earth working implement according to claim 1 wherein said blade and the opposite wall of the socket are pro vided with cooperating means for further securing the tooth against withdrawal thereof from the blade.

4. An earth working implement in accordance with claim 3 wherein said cooperating means of said wall and blade comprise projecting means on one end and a depressed portion presenting a shoulder on the other against which the projecting means abuts when within the depressed portion.

5. An earth-working implement according to claim 1, wherein said blade is provided with projections at spaced positions along said tooth receiving length on one face of the blade, said projections providing locating means to help restrain lateral movement of a tooth relative to said blade.

6. An earth-working implement according to claim I, wherein the implement is a bucket and said blade is provided in the form of a toe plate on one side of the mouth of the bucket.

7. An earth-working implement according to claim 1, wherein the implement is a blade member, said earth-engaging blade being provided by a portion of said blade member which, in use, engages the ground.

8. An earth working implement comprising: an elongated earth-engaging blade bounded by an imperforate earth-engag ing edge,

at least one tooth mounted on said blade said tooth having a rear bifurcated portion forming a socket to receive the edge portion of a blade therein,

a wall of the socket and the opposed surface of the blade each being formed with a depressed portion in opposed relation to each other,

the depressed portion of the wall presenting a forwardly facing shoulder,

the depressed portion of the blade presenting a rearwardly facing shoulder spaced forwardly of the shoulder formed on the wall and extending the entire length of said blade so that the tooth can be mounted at any position along the length of the blade,

said depressed portions extending in a direction providing a side entrance to the space between the shoulders,

and clamping means extending through the entrance in the depressed portions of the wall and blade between the shoulders, to secure the tooth on the blade.

9. An earth-working implement according to claim 8 wherein the clamping means comprises a pin member which is resiliently compressible inwardly.

10. An earth-working implement according to claim 8, wherein said blade is provided with projections at spaced positions along said blade receiving length on one face of the blade, adjacent projections providing locating means to help 12. An earth-working implement according to claim 8 restrain lateral movement of a tooth relative to said blade. wherein the implement is a blade member said anbensaaing II. An earth-working implement according to claim 8 wherein the implement is a bucket and said blade is provided :TQ ZSJZ ggg of said blade member in the form of a toe plate on one side of the mouth of the 5 g g gr I l l i i bucket.

Patent NO. 3,678,605 Dated July 25, 1972 Inventor(g) DEREK ARTHUR PRIME It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 10, line 3, cancel "receiving length".

Signed and sealed this 13th day of February 1973.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCI-[ALK Attesting Officer Commissioner of Patents FORM PC1-1050 (10-69) USCOMM-DC 60376-P69 Q U 5 GOVERNMENT PRINYVNG OFFlCE (9'9 0-365-334

Claims

1. An earth working implement comprising, an elongated imperforate earth-engaging blade bounded by an earth-engaging edge, at least one tooth mounted on said blade, said tooth having a rear bifurcated portion forming a socket to receive the edge portion of the blade therein, said tooth having a forwardly facing wall formed with an opening therethough leading into the socket, clamping means in the opening and in bearing contact with a wall of the socket and an adjacent surface of the blade to clamp said tooth to said blade, said blade being of constant cross section substantially along its entire length and forming an elongated tooth-receiving portion whose length is greater than the width of said tooth, said socket being of constant cross section corresponding to that of the edge portion of the blade, said clamping means being insertable through said opening to bear directly against said blade at any position throughout said blade length, whereby said tooth may be clamped to said blade at any desired position throughout said tooth receiving length of said blade when said clamping means is retained within said recess.

3. An earth working implement according to claim 1 wherein said blade and the opposite wall of the socket are provided with cooperating means for further securing the tooth against withdrawal thereof from the blade.

6. An earth-working implement according to claim 1, wherein the implement is a bucket and said blade is provided in the form of a toe plate on one side of the mouth of the bucket.

8. An earth working implement comprising: an elongated earth-engaging blade bounded by an imperforate earth-engaging edge, at least one tooth mounted on said blade said tooth having a rear bifurcated portion forming a socket to receive the edge portion of a blade therein, a wall of the socket and the opposed surface of the blade each being formed with a depressed portion in opposed relation to each other, the depressed portion of the wall presenting a forwardly facing shoulder, the depressed portion of the blade presenting a rearwardly facing shoulder spaced forwardly of the shoulder formed on the wall and extending the entire length of said blade so that the tooth can be mounted at any position along the length of the blade, said depressed portions extending in a direction providing a side entrance to the space between the shoulders, and clamping means extending through the entrance in the depressed portioNs of the wall and blade between the shoulders, to secure the tooth on the blade.

10. An earth-working implement according to claim 8, wherein said blade is provided with projections at spaced positions along said blade receiving length on one face of the blade, adjacent projections providing locating means to help restrain lateral movement of a tooth relative to said blade.

11. An earth-working implement according to claim 8 wherein the implement is a bucket and said blade is provided in the form of a toe plate on one side of the mouth of the bucket.

12. An earth-working implement according to claim 8 wherein the implement is a blade member, said earth-engaging blade being provided by a portion of said blade member which, in use, engages the ground.