CA1069961A - Insert for attaching a tip of an excavator tooth - Google Patents
Insert for attaching a tip of an excavator toothInfo
- Publication number
- CA1069961A CA1069961A CA286,078A CA286078A CA1069961A CA 1069961 A CA1069961 A CA 1069961A CA 286078 A CA286078 A CA 286078A CA 1069961 A CA1069961 A CA 1069961A
- Authority
- CA
- Canada
- Prior art keywords
- insert
- holder
- tip
- sleeve
- cutting edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2808—Teeth
- E02F9/2816—Mountings therefor
- E02F9/2833—Retaining means, e.g. pins
- E02F9/2841—Retaining means, e.g. pins resilient
Abstract
Abstract of the Disclosure The present invention relates to an insert for removably attaching an excavator tooth tip, wherein the tip includes a sleeve adapted to fit on a holder secured to the digging edge of an excavator bucket. Apertures are provided in opposed portions of the sleeve and adapted to be aligned with a bore in the holder running parallel with the digging edge of the tooth tip and along a plane containing the centerline of the tooth. The insert comprises a first and second metal member having a resilient element sandwiched between them which is loaded in compression. One surface of the insert is adapted to bear against the surfaces of the digging edges of the apertures in the sleeve portions while the other surface of the insert bears against the surfaces facing away from the digging edge.
The first metal part is U-shaped longitudinally with the legs of the U shaped first metal part extending away from the digging edge of the tip and overlapping the ends of the second metal part. The gap between the end of the U-shaped legs and the surface of the respective apertures in the sleeve is less than the allowable resilient travel of the resilient member within the fatigue limits of the resilient member.
The first metal part is U-shaped longitudinally with the legs of the U shaped first metal part extending away from the digging edge of the tip and overlapping the ends of the second metal part. The gap between the end of the U-shaped legs and the surface of the respective apertures in the sleeve is less than the allowable resilient travel of the resilient member within the fatigue limits of the resilient member.
Description
`
g6~
The invention relates to a removable excavator tooth tip on a holder fixed to an excavator bucket, and more particu-larly, to an insert for connecting the tip to the holder.
In one known tip attachment of this kind, as described in French Patent 22 6~ 140, the apertures in the holder are of a somewhat oval cross-section. The surfaces, facing the rubber element, sandwiched between two shaped metal parts, are uniforrnly flat so that the said element may be compressed to any desired degree. This means that under the dynamic loading arising in excavating, the rubber element soon reaches the limit of its load-carrying capacity, since the rubber no longer regenerates but loses its resiliency. ~ ~
In the case of another known tooth attachment, as ~i described in German AS 1,960,411, the holder engages the trans-verse bolts constituting the connection engaged through an intermediate resilient layer, leaving between themselves a gap, the width of which, in the longitudinal direction of the exca-vator tooth, is less than the thickness of the resilient inter-mediate layer. This is intended to prevent the resilient intermediate layer from being overloaded by the dynamic qtresses arising during excavating. On the other hand, the intermediate layer must be highly resilient if it is to keep the connecting element in place. In the case of the known attachment, this is impossible since dynamic stressing of the resilient intermediate layer must be taken into account, and the width of the gap, therefore, does not permit variable compression. Thus, the -~
possible resilient travel of the intermediate layer will be used only partly when the connecting element is being driven out. If the gap in this known arrangement were to be enlarged, thus allowing the resilient intermediate layer to be cornpressed to a greater degree, then, as in the case of the other tooth attach- ;
ment outlined above, the dynamic loading would soon cause the ~6~g6~
rubber to reach the limit of fatigue in its load-carrying capacity. The rubber would then no Longer function as a resilient element. Furthermore, in the case of the known arrangement, the resilient intermediate layer is compressed only on one side while the connecting element is being drlven out, since the said connecting element is driven out on each side only by means of a cam. As a result of this design, and since the full resilient travel cannot be utilized while the insert is being driven out, in the known tooth attachment only a portion ~ ' of the force of the resilient intermediate element is made use of. Thus, the resistance of the insert to lateral forces is ;~
relatively low, and the tooth tip cannot be secured optimally to the holder by means of the insert.
It is the purpose of the invention to provide an ~ ~, attachment for an excavator tooth in which, on the one hand, the ', rubber element is loaded to its elastic limit while the insert is being statically driven out and, on the other han~, the resilisnt rubber element remains resistant to fatigue under the ~, continuous dynamic loading arising from excavating operations.
In addition to this, when the connecting element is being driven out, the rubber element is to be stressed uniformly over its ~' entire length in order to achieve an optimal resilient action, and the rubber element itself is not to be stressed in shear while it is being driven out.,' ~' A construction in accordance with the present invention includes an insert for removably attaching an excavator tooth tip, wherein the tip includes a sleeve adapted to fit on a holder secured to the digging edge of an excavator bucketO
Apertures are provided in opposed portions of the sleeve and '~
adapted to be aligned with a bore in -the holder running parallel ', with the digging edge of the tooth tip and along a plane containing the centerline of the tooth. The insert comprises .
.. .. ., ~ - - ., a first and second metal member having a resilient element sandwiched between them which i9 loaded in compression. One surface of the insert is adapted to bear against the surfaces facing the cutting edge while the other surface of the insert is adapted to bear against the surface~ facing away from the digging edge. The first metal part is U-shaped longitudinally with the legs of the U-shaped first metal part extending away from the digging edge of the ~ip and overlapping the ends of the second metal part. The gap between the end of the U-shaped legs and the surface of the respective apertures inthe sleeve i9 less than the allowable resilient travel or tolerable compression travel of the resilient member within the fatigue limits of the resilient member~ ;
In a more specific embodiment thereof, the metal parts, and particularly the second metal part, are provided with projections having camminy surfaces, and the transverse dimension of the insert in the area of the projections is greater than the diameter of the aperture in the sleeve portion but is such that when a force is applied to an end of the insert, the camming surfaces on the projection will force the second metal part to compress the re~ilient ~ember again~t the first metal part beyond the fatigue limit of the resilient member, thus reducing the transvexse dimension-of the in~ert in th~ area of the projection, thereby allowing the in~ert to pa~s through the apertures in the sleeve. In a further embodim~nt, the first metal part is provided wlth ~loping surfaces ~uch that when the insert is being driven out, the re~ilient memker is compressed to its elastic limit by the sloping surfaces in addition to the camming surfaces.
The advantage of such an attachment is that when B ~ the insert is being driven out in order to release the tooth ~ tip from the holder, the rubber element is more heavily compressed ~69~
by the cams and the sloping surfaces of the shaped metal parts until its elastic limit is reached, which is not possible when it is in operation. The cams and the sloping surfaces of the ~ -insert and the matching surfaces of the holder and of the tooth tip, are arranged in such a manner that, when the connecting element is being driven out. the rubber element is compressed substantially uniforrnly over its entire length. This ensures that the spring force of the rubber element is used to its full advantage for the purpose of locking the cormecting element and that, even under the heaviest loads, the tooth tips are securely held in the holdexs.
An example of the emb~diment of the inventiorl i~
described hereinafter in conjunction with the drawings attached hereto, wherein~
Figure 1 i~ a fragmentary, longitudi~al cross-~ection taken throu~h an excavator tooth, and Figure 2 i9 a fragmentary, transverse cross-section taken along the line II-II in Figure 1~
Tip 20 of the excavator tooth consists of a cutting or digging edge 21 and a sleeve 22 by means of which the said tip is slipped over the holder 23~ Holder 23 defi~es an aperture 24 extending along the centerline parallel with digging edge 21.
The kore 24 is aligned with apertures 25 in sleeve 22 and accom modates insert 26. ~
The insert comprises U-shaped metal part 27, rubber ' element 28, and shaped metal part 29.
On its outer side, facing the base of holder 23, shaped rnetal part 29 is fitted with projections 30 having camming surfaces 30b and 30c respectively. The side of these projections facing sleeve 22 ri3e more steeply than the side facing holder 23. The latter ha~ corr~sponding sloping surface 31 cooperating _,.. , .., .1 . , . ., ., . ~, , .: . .
;9~
,,.'~ .
with sloping ~urfaces 30b of projections 30~
Arranged upon U-~haped metal part 27 are sloping .:
surfaces 27a which cooperate with corresponding sloping surfaces 23a on holder 23. The surface of part 27 facing towards the digging edge 21, is provided with a reces~ 32 ~:
for the better definition of sloping surface 23a of holder 23.
The procedure for driving out insert 26 is as follows: A blow with a heavy hammer on end face 27b of U-shaped metal part 27 causes shaped metal part 29 to be carried along by leg 27c of shaped metal part 27. This causes increasing compression of rubber element 28, on the :
one hand, by sloping surface 27a of U-shaped metal part 27 and sloping surface 23a of holder 23 and, on the other hand, by cam surfaces 30b and 30c of shaped metal part 29, sloping surface 31 of holder 23, and qurfaca 33 of sleeve 22~ As the insert 26 is driven further out, the compression applied to rùbber element 28 is greater than that applied by the loads arising during excavating. - :
:
, :';
:' .
~r ., ' ~6 ~
s..,r.~
U~
_ 5 _
g6~
The invention relates to a removable excavator tooth tip on a holder fixed to an excavator bucket, and more particu-larly, to an insert for connecting the tip to the holder.
In one known tip attachment of this kind, as described in French Patent 22 6~ 140, the apertures in the holder are of a somewhat oval cross-section. The surfaces, facing the rubber element, sandwiched between two shaped metal parts, are uniforrnly flat so that the said element may be compressed to any desired degree. This means that under the dynamic loading arising in excavating, the rubber element soon reaches the limit of its load-carrying capacity, since the rubber no longer regenerates but loses its resiliency. ~ ~
In the case of another known tooth attachment, as ~i described in German AS 1,960,411, the holder engages the trans-verse bolts constituting the connection engaged through an intermediate resilient layer, leaving between themselves a gap, the width of which, in the longitudinal direction of the exca-vator tooth, is less than the thickness of the resilient inter-mediate layer. This is intended to prevent the resilient intermediate layer from being overloaded by the dynamic qtresses arising during excavating. On the other hand, the intermediate layer must be highly resilient if it is to keep the connecting element in place. In the case of the known attachment, this is impossible since dynamic stressing of the resilient intermediate layer must be taken into account, and the width of the gap, therefore, does not permit variable compression. Thus, the -~
possible resilient travel of the intermediate layer will be used only partly when the connecting element is being driven out. If the gap in this known arrangement were to be enlarged, thus allowing the resilient intermediate layer to be cornpressed to a greater degree, then, as in the case of the other tooth attach- ;
ment outlined above, the dynamic loading would soon cause the ~6~g6~
rubber to reach the limit of fatigue in its load-carrying capacity. The rubber would then no Longer function as a resilient element. Furthermore, in the case of the known arrangement, the resilient intermediate layer is compressed only on one side while the connecting element is being drlven out, since the said connecting element is driven out on each side only by means of a cam. As a result of this design, and since the full resilient travel cannot be utilized while the insert is being driven out, in the known tooth attachment only a portion ~ ' of the force of the resilient intermediate element is made use of. Thus, the resistance of the insert to lateral forces is ;~
relatively low, and the tooth tip cannot be secured optimally to the holder by means of the insert.
It is the purpose of the invention to provide an ~ ~, attachment for an excavator tooth in which, on the one hand, the ', rubber element is loaded to its elastic limit while the insert is being statically driven out and, on the other han~, the resilisnt rubber element remains resistant to fatigue under the ~, continuous dynamic loading arising from excavating operations.
In addition to this, when the connecting element is being driven out, the rubber element is to be stressed uniformly over its ~' entire length in order to achieve an optimal resilient action, and the rubber element itself is not to be stressed in shear while it is being driven out.,' ~' A construction in accordance with the present invention includes an insert for removably attaching an excavator tooth tip, wherein the tip includes a sleeve adapted to fit on a holder secured to the digging edge of an excavator bucketO
Apertures are provided in opposed portions of the sleeve and '~
adapted to be aligned with a bore in -the holder running parallel ', with the digging edge of the tooth tip and along a plane containing the centerline of the tooth. The insert comprises .
.. .. ., ~ - - ., a first and second metal member having a resilient element sandwiched between them which i9 loaded in compression. One surface of the insert is adapted to bear against the surfaces facing the cutting edge while the other surface of the insert is adapted to bear against the surface~ facing away from the digging edge. The first metal part is U-shaped longitudinally with the legs of the U-shaped first metal part extending away from the digging edge of the ~ip and overlapping the ends of the second metal part. The gap between the end of the U-shaped legs and the surface of the respective apertures inthe sleeve i9 less than the allowable resilient travel or tolerable compression travel of the resilient member within the fatigue limits of the resilient member~ ;
In a more specific embodiment thereof, the metal parts, and particularly the second metal part, are provided with projections having camminy surfaces, and the transverse dimension of the insert in the area of the projections is greater than the diameter of the aperture in the sleeve portion but is such that when a force is applied to an end of the insert, the camming surfaces on the projection will force the second metal part to compress the re~ilient ~ember again~t the first metal part beyond the fatigue limit of the resilient member, thus reducing the transvexse dimension-of the in~ert in th~ area of the projection, thereby allowing the in~ert to pa~s through the apertures in the sleeve. In a further embodim~nt, the first metal part is provided wlth ~loping surfaces ~uch that when the insert is being driven out, the re~ilient memker is compressed to its elastic limit by the sloping surfaces in addition to the camming surfaces.
The advantage of such an attachment is that when B ~ the insert is being driven out in order to release the tooth ~ tip from the holder, the rubber element is more heavily compressed ~69~
by the cams and the sloping surfaces of the shaped metal parts until its elastic limit is reached, which is not possible when it is in operation. The cams and the sloping surfaces of the ~ -insert and the matching surfaces of the holder and of the tooth tip, are arranged in such a manner that, when the connecting element is being driven out. the rubber element is compressed substantially uniforrnly over its entire length. This ensures that the spring force of the rubber element is used to its full advantage for the purpose of locking the cormecting element and that, even under the heaviest loads, the tooth tips are securely held in the holdexs.
An example of the emb~diment of the inventiorl i~
described hereinafter in conjunction with the drawings attached hereto, wherein~
Figure 1 i~ a fragmentary, longitudi~al cross-~ection taken throu~h an excavator tooth, and Figure 2 i9 a fragmentary, transverse cross-section taken along the line II-II in Figure 1~
Tip 20 of the excavator tooth consists of a cutting or digging edge 21 and a sleeve 22 by means of which the said tip is slipped over the holder 23~ Holder 23 defi~es an aperture 24 extending along the centerline parallel with digging edge 21.
The kore 24 is aligned with apertures 25 in sleeve 22 and accom modates insert 26. ~
The insert comprises U-shaped metal part 27, rubber ' element 28, and shaped metal part 29.
On its outer side, facing the base of holder 23, shaped rnetal part 29 is fitted with projections 30 having camming surfaces 30b and 30c respectively. The side of these projections facing sleeve 22 ri3e more steeply than the side facing holder 23. The latter ha~ corr~sponding sloping surface 31 cooperating _,.. , .., .1 . , . ., ., . ~, , .: . .
;9~
,,.'~ .
with sloping ~urfaces 30b of projections 30~
Arranged upon U-~haped metal part 27 are sloping .:
surfaces 27a which cooperate with corresponding sloping surfaces 23a on holder 23. The surface of part 27 facing towards the digging edge 21, is provided with a reces~ 32 ~:
for the better definition of sloping surface 23a of holder 23.
The procedure for driving out insert 26 is as follows: A blow with a heavy hammer on end face 27b of U-shaped metal part 27 causes shaped metal part 29 to be carried along by leg 27c of shaped metal part 27. This causes increasing compression of rubber element 28, on the :
one hand, by sloping surface 27a of U-shaped metal part 27 and sloping surface 23a of holder 23 and, on the other hand, by cam surfaces 30b and 30c of shaped metal part 29, sloping surface 31 of holder 23, and qurfaca 33 of sleeve 22~ As the insert 26 is driven further out, the compression applied to rùbber element 28 is greater than that applied by the loads arising during excavating. - :
:
, :';
:' .
~r ., ' ~6 ~
s..,r.~
U~
_ 5 _
Claims (4)
1. An insert for removably attaching an excavator tooth tip having a cutting edge to fit to a holder secured to the digging edge of an excavator bucket, said tip including a sleeve adapted to fit on the holder, and apertures provided in opposed portions of the sleeve and adapted to be aligned with a bore in said holder for receiving the insert, said bore running parallel with the cutting edge of the tooth tip and along a plane containing the centerline of the tooth, said insert comprising first and second metal members having a resilient member sandwiched between them which is loaded in compression, said resilient member having an elastic limit, a fatigue limit and a tolerable compression travel, a first surface of the insert adapted to bear against the surfaces facing towards the cutting edge, and a second surface of the insert adapted to bear against the surfaces facing away from the cutting edge, the first metal member being U-shaped longitudinally, each leg of the U-shaped first metal member being adapted to be located within a respective sleeve aperture with the legs extending away from the cutting edge of the tip and overlapping the ends of the second metal member, the ends of the legs defining a gap with faces of said apertures, said gap being less than said tolerable compression travel within the fatigue limit of the resilient member.
2. An insert according to claim 1, wherein projections with camping surfaces are provided on the second metal member facing away from the resilient member, the insert having a transverse dimension at the projections greater than the transverse dimension of the apertures, but being such that when a force is applied to an end of the insert, the camming surfaces on the projections act on the bore surfaces of the holder and force the second metal member to compress the resilient member against the first metal member beyond the fatigue limit of the resilient member, thus reducing said transverse dimension of the insert, such that the insert passes through the apertures.
3. An insert according to claim 2, wherein the holder is provided with sloping surfaces adapted to be in opposed relation with said camming surfaces, such that, as the insert is being driven out, the resilient member is compressed to its elastic limit as the sloping surfaces engage the camming surfaces of the second metal member.
4. An assembly comprising an excavator tooth tip mounted on a holder adapted to be secured to the digging edge of an excavator bucket, the tip having a sleeve adapted to fit on the holder to mount it thereon, apertures provided in-opposed portions of the sleeve for alignment with a bore in the holder, said bore running parallel with a cutting edge of the tooth tip and along a plane containing the cutting edge, and an insert as defined in claim 1, 2 and 3 disposed in said bore and apertures with a first surface of said insert bearing against a surface facing towards said cutting edge and a second surface of said insert bearing against a surface facing away from said cutting edge.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762639989 DE2639989C2 (en) | 1976-09-04 | 1976-09-04 | Detachable fastening of an excavator tooth provided with a sleeve at the rear on a tooth holder engaging in the sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069961A true CA1069961A (en) | 1980-01-15 |
Family
ID=5987212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA286,078A Expired CA1069961A (en) | 1976-09-04 | 1977-09-02 | Insert for attaching a tip of an excavator tooth |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5927806B2 (en) |
| AT (1) | AT352640B (en) |
| AU (1) | AU507527B2 (en) |
| BE (1) | BE858281A (en) |
| BR (1) | BR7705873A (en) |
| CA (1) | CA1069961A (en) |
| DE (1) | DE2639989C2 (en) |
| FR (1) | FR2363669A1 (en) |
| GB (1) | GB1576535A (en) |
| IT (1) | IT1079829B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881331A (en) * | 1985-04-03 | 1989-11-21 | Gamma Lock (Proprietary) Limited | Teeth for use with earth moving equipment |
| US4663867A (en) * | 1985-10-02 | 1987-05-12 | Esco Corporation | Locking device for whisler type adapter |
| US5852888A (en) * | 1996-11-08 | 1998-12-29 | Caterpillar Inc. | Apparatus for protecting a base of a bucket of an earth working machine |
| US5909962A (en) * | 1997-11-26 | 1999-06-08 | Caterpillar Inc. | Tip assembly for an edge of an implement of a work machine |
| WO2003004782A2 (en) * | 2001-07-06 | 2003-01-16 | Esco Corporation | Coupling for excavating wear part |
| US10400427B2 (en) * | 2017-05-31 | 2019-09-03 | Srj, Inc. | Flex pin |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2772492A (en) * | 1953-02-12 | 1956-12-04 | American Brake Shoe Co | Retainer pins for dipper teeth |
| SE333551B (en) * | 1968-12-04 | 1971-03-15 | Bofors Ab | |
| US3520224A (en) * | 1969-02-12 | 1970-07-14 | Hensley Equipment Co Inc | Retaining pin |
| BR6308410D0 (en) * | 1972-10-31 | 1974-09-05 | Poclain Sa | REPLACEMENT TOOTH FOR PUBLIC WORKS INSTRUMENT, ADMITTING A PRIVATE KEY |
| FR2264140A1 (en) * | 1974-03-15 | 1975-10-10 | Garcia Roger | Tooth support for an excavator bucket - has tooth point and adaptor abutting on only three faces |
-
1976
- 1976-09-04 DE DE19762639989 patent/DE2639989C2/en not_active Expired
-
1977
- 1977-07-28 AT AT555877A patent/AT352640B/en not_active IP Right Cessation
- 1977-08-16 IT IT5068977A patent/IT1079829B/en active
- 1977-08-30 AU AU28369/77A patent/AU507527B2/en not_active Expired
- 1977-08-31 BE BE180576A patent/BE858281A/en not_active IP Right Cessation
- 1977-08-31 FR FR7726408A patent/FR2363669A1/en active Granted
- 1977-09-01 GB GB3652877A patent/GB1576535A/en not_active Expired
- 1977-09-02 BR BR7705873A patent/BR7705873A/en unknown
- 1977-09-02 CA CA286,078A patent/CA1069961A/en not_active Expired
- 1977-09-02 JP JP52105048A patent/JPS5927806B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5927806B2 (en) | 1984-07-09 |
| IT1079829B (en) | 1985-05-13 |
| JPS5332901A (en) | 1978-03-28 |
| ATA555877A (en) | 1979-02-15 |
| AU2836977A (en) | 1979-03-08 |
| DE2639989C2 (en) | 1982-04-29 |
| BR7705873A (en) | 1978-09-05 |
| AT352640B (en) | 1979-09-25 |
| FR2363669B1 (en) | 1980-12-05 |
| AU507527B2 (en) | 1980-02-21 |
| GB1576535A (en) | 1980-10-08 |
| FR2363669A1 (en) | 1978-03-31 |
| DE2639989A1 (en) | 1978-03-09 |
| BE858281A (en) | 1977-12-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |