Excavating lip-mounted adapter and associated connection and shielding apparatus
Various embodiments of an excavating bucket are provided in which a spaced series of excavating tooth adapters are secured to a front edge of a lip portion of the bucket by welding opposite side ear portions of the adapters into complementarily shaped front edge recesses in the lip to thereby substantially strengthen the adapter/lip weld joints. Each adapter is configured in a manner such that no portion thereof extends rearwardly along the bottom side of the lip, thereby desirably reducing the vertical thickness of each adapter. Front lip edge protectors may be interdigitated with the adapters and suitably secured to the lip in a variety of manners, and replaceable tooth points are removably secured to front nose portions of the adapters.
The present invention generally relates to excavating apparatus and, in representative embodiments thereof, more particularly provides improved excavating tooth adapters and associated techniques for operatively mounting them on the forward lower lip portion of an excavating device such as an excavating bucket.
Large excavating buckets, dippers or the like are typically provided with a spaced series of earth-cutting teeth which are each formed from two primary parts—a relatively large adapter and a relatively small replaceable point. The adapter has a rear base portion which is welded to a front portion of the excavating lip, and a forwardly projecting nose portion onto which the replaceable tooth point is removably secured by a suitable connecting pin or other connecting structure. Additionally, a series of replaceable lip protectors or shields may be interdigitated with the adapters, and suitably secured to the lip, to shield front edge portions of the lip between the adapters from operational abrasion wear.
One conventional type of bucket lip adapter is generally C-shaped and has upper and lower leg portions which respectively extend rearwardly along, and are welded along opposite side edge portions thereof to, top and bottom side portions of the lip. The interdigitated lip protectors extend beneath and shield the rearwardly extending lower adapter leg portions of the spaced adapters. In this conventional adapter/lip protector construction the positioning of portions of the lip protectors beneath the bottom adapter legs thickens the vertical dimension of the toothed excavating lip assembly in a manner undesirably lessening its earth penetration efficiency.
It is also known in the excavating art to utilize a lip adapter configuration in which the lower adapter leg portion is eliminated so that only an upper leg portion of the adapter extends rearwardly along the lip (i.e., an upper side portion thereof) and is surface welded thereto along the edge periphery of the upper adapter leg. While this reduces the vertical thickness of the toothed excavating lip assembly, it undesirably weakens the adapter/lip attachment strength. This is due to the fact that the weld area between the upper adapter leg and the top side of the lip (which provides substantially the entire adapter/lip attachment strength) is oriented in a manner such that the weld area is disposed in an exposed position above the top side of the lip and may be undesirably subjected to high tensile stresses during use of the excavating bucket.
As can readily be seen from the foregoing, a need exists for improved techniques and structures for operatively connecting adapters and associated lip protectors to an excavating lip structure. It is to this need that the present invention is directed.
SUMMARY OF THE INVENTIONIn carrying out principles of the present invention, in accordance with illustrated embodiments thereof, specially designed excavating apparatus is provided which is representatively in the form of an excavating bucket having a blade or lip portion to which a series of wear members are secured in a mutually spaced relationship along the length of the lip. The lip has a top side, a bottom side and a front edge, and the wear members are representatively adapters having forwardly projecting nose portions to which replaceable tooth points may be removably secured, and lip protectors may be secured to the lip in various manners in an interdigitated relationship with the adapters to shield front lip edge portions between the adapters from operational abrasion wear. The adapters have bodies longitudinally extending transversely to the front edge of the lip and top portions extending rearwardly along the top side of the lip.
According to one aspect of the invention, each adapter is secured to the lip by cooperating mounting portions on the lip and the adapter disposed laterally outwardly of the adapter body and between the top and bottom sides of the lip, the cooperating mounting portions overlapping in a front-to-rear direction and being fixedly secured to one another, illustratively by welding. Preferably, the cooperating mounting portions are opposite side projections formed on each adapter and front side edge notches formed in the lip. The side projections or ears on the adapters are complementarily received and welded within the lip notches, which are preferably of semicircular shapes.
These front weld areas which secure the adapters to the lip do not appreciably project above the top side of the lip and, for the most part, are positioned laterally outwardly of their associated adapters. Accordingly, compared to conventional techniques for welding adapters to excavating lips, the present invention provides a stronger weld joint due to the fact that the front weld joints, during use of the bucket, are subjected primarily to shear stress instead of tensile stress, and also provide enhanced attachment strength due to their positioning in a laterally offset relationship with their associated adapters. According to further features of the invention, forwardly facing portions of these front weld areas may be shielded by portions of the adapter connector ears or (if lip protectors are installed) by portions of the lip protectors.
Preferably, no portion of any of the adapters extends rearwardly along the bottom side of the lip. Accordingly, the overall heights of the adapters are reduced, thereby desirably increasing the overall earth penetration efficiency of the bucket. Lip protectors installed between the adapters are illustratively configured to extend directly along the bottom side of the lip. Since the installed lip protectors are extended directly beneath the bottom side of the lip, without any adapter portion being interposed between the underside of the lip and associated lip protectors, the lip protectors may be vertically thicker and are thus desirably provided with longer operating lives since they may be permitted to wear away clear to the underside of the lip before having to be replaced.
According to another aspect of the invention, the lip protectors (if utilized) are operatively installed on the lip in a variety of representative novel manners. Utilizing one lip protector connection technique, telescoped connection portions are formed on the lip and lip protectors and have aligned fastening openings formed therein. A fastening structure extends through these aligned openings and removably intersecures these telescoped connection portions. In a second representative lip protector connection technique embodying principles of the present invention, the lip protectors extend along the bottom side of the lip and have openings therein which are aligned with openings in the lip. The lip protectors are captively retained on the lip by a fastening structure extending through these aligned openings.
In a third representative lip protector connection technique embodying principles of the present invention, the lip protectors extend along bottom sides of the lip and are supportingly interlocked with bottom side weldment structures on the bottom side of the lip. In a fourth representative lip protector connection technique embodying principles of the present invention, the adapters have underside recesses therein with upper walls having first fastening openings extending upwardly therethrough. The lip protectors have opposite ends with upturned tab portions with outer side recesses therein. Tab portions of lip protectors on facing ends of adjacent pairs of lip protectors project upwardly into the adapter underside recesses with the facing outer side recesses of each adjacent tab pair forming second fastening openings within the underside recesses in the adapters. Fastening structures extend through the first and second fastening openings and secure the lip protectors to the adapters.
BRIEF DESCRIPTION OF THE DRAWINGS
In one embodiment thereof, the present invention provides excavation apparatus representatively in the form of an excavating bucket 10, a portion of which is shown in simplified, partially exploded perspective form in
According to key aspects thereof, the present invention provides novel attachment structure and apparatus for securing the interdigitated adapters 16 and lip protectors 22 to the lip 14. Portions of five representative embodiments of the bucket 10 are shown—(1) a first embodiment 10 shown in
Referring initially to
While ear portions 26 on the adapters 16 are representatively shown as being received and welded within corresponding notches or recesses 24 in the front edge surface of the lip 14, other forms of cooperating mounting portions on the lip 14 and adapters 16 (disposed laterally outwardly of the adapters and between the top and bottom sides of the lip, interlocked in a forward-to rearward direction and fixedly secured to one another) could be utilized if desired in any of the representatively illustrated bucket embodiments 10-10d. As but one example of this alternative cooperating mounting portion structure embodying principles of the present invention, instead of having portions of the adapters 16 received and welded within notches 24 on the front edge of the lip 14, the front edge of the lip 14 could have horizontally spaced apart front projections which are received and welded within corresponding recesses or notches suitably formed in the adapters.
With continuing reference to the bucket embodiment 10 shown in
Next, the hollow tooth points 20 are telescoped onto their associated adapter noses 18 and captives retained thereon by suitable connector pins 42 (see
As can best be seen in
In the second representative bucket embodiment 10a shown in
In the third representative bucket embodiment 10b shown in
In the fourth representative bucket embodiment 10c shown in FIGS; 18-21, the previously described bottom lip side support weldments 36 and associated lip protector side edge recesses 40 are eliminated. The forwardly projecting adapter ear extensions 38c, which are received in the lip protector recesses 40c, are widened in a manner such that they extend horizontally across front side surfaces of the lip weld areas 28c.
Each adapter 16c, rearwardly of its nose portion 18c, has an underside cavity 74 (see
The opposite ends of each lip protector 22c have forwardly facing, generally planar abutment surfaces 82 which, in the assembled bucket structure 10c cross-sectionally depicted in
With the adapters 16c operatively installed on the lip 14C, the lip protectors 22c interdigitated therewith are installed by positioning their body portions 30c (see
To captively and removably retain the installed lip protectors 22c on the lip 14c, at each adapter 16c a bolt 96 (see
The fifth representative bucket embodiment 10d shown in
Compared to conventional adapter-to-lip construction techniques, the connection of the previously described adapters to their associated lip structures using transverse adapter ears complementarily received and welded in corresponding front lip edge notches provides substantially greater adapter weld strength at the front edge of the lip since the front adapter weld portions are laterally offset from their associated adapters. Additionally, since these front weld areas do not project upwardly beyond the top side of the lip, and (in bucket embodiments 10-10c) have forwardly facing front surface areas which are shielded by either portions of their associated adapters or by adjacent lip protectors, they are subjected to a desirably lesser degree of abrasion wear during use of their associated excavating buckets. Moreover, these front adapter weld areas are primarily exposed to shear stresses instead of tensile stresses which they are less capable of withstanding.
Further, since the adapters shown in the representatively illustrated bucket embodiments 10-10d are devoid of bottom legs which extend rearwardly along bottom sides of their associated lips, the lip protectors (when used) may upwardly extend clear to the bottom side of the lip in stead of being spaced downwardly apart therefrom by a bottom adapter leg interposed between the lip protector and the bottom side of the lip. For the end user, this advantageously results in a longer operating life for the lip protectors, since they can wear away clear up to the bottom side of excavator lip which they shield from operational excavation abrasion and wear before they need to be replaced.
The foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims.
Claims
1. Excavating apparatus comprising:
- a lip having a top side, a bottom side and a front edge;
- a wear member having a body longitudinally extending transversely to said front edge and having a top portion extending rearwardly along said top side, and a front portion extending forwardly beyond said front edge; and
- cooperating mounting portions on said lip and said wear member disposed laterally outwardly of said wear member body and between said top and bottom sides of said lip, said cooperating mounting portions overlapping in a front-to-rear direction and being fixedly secured to one another.
2. The excavating apparatus of claim 1 wherein:
- said cooperating mounting portions comprise a side projection formed on said wear member, and a recess extending rearwardly through said front edge of said lip and receiving said side projection.
3. The excavating apparatus of claim 1 wherein:
- said cooperating mounting portions are welded to one another along a front weld area.
4. The excavating apparatus of claim 3 wherein:
- no portion of said front weld area appreciably projects upwardly past said top side of said lip.
5. The excavating apparatus of claim 3 wherein:
- said cooperating mounting portions include a side projection formed on said wear member, and
- said front weld area has a forwardly facing surface portion shielded by a portion of said side projection.
6. The excavating apparatus of claim 3 wherein:
- said front weld area has a forwardly facing surface portion, and
- said excavating apparatus further comprises a lip protector secured to said front edge of said lip laterally adjacent said wear member and shielding said forwardly facing surface portion of said weld area.
7. The excavating apparatus of claim 1 wherein:
- said cooperating mounting portions are welded to one another along a front weld area extending laterally outwardly from said wear member adjacent said front edge of said lip.
8. The excavating apparatus of claim 1 wherein:
- said excavating apparatus is an excavating bucket.
9. The excavating apparatus of claim 1 wherein:
- said wear member is an adapter, and
- said front portion of said wear member is an adapter nose.
10. The excavating apparatus of claim 9 further comprising:
- a replaceable tooth point captively retained on said adapter nose.
11. The excavating apparatus of claim 1 wherein:
- no appreciable portion of said wear member extends rearwardly beneath said bottom side of said lip.
12. The excavating apparatus of claim 11 further comprising:
- a lip protector secured to said front edge of said lip laterally adjacent said wear member and rearwardly extending along said bottom side of said lip beneath said top portion of said wear member.
13. The excavating apparatus of claim 2 wherein:
- said front edge of said lip has a downwardly and forwardly sloped top side portion, and
- said cooperating mounting portions are welded to one another along a weld area which extends forwardly along said downwardly and forwardly sloped top side portion of said front edge of said lip.
14. Excavating apparatus comprising:
- an excavating lip structure having a top side and a front edge portion with a notched area extending rearwardly therethrough; and
- a wear member projecting forwardly beyond said front edge portion, said wear member having a top portion extending rearwardly along said top side of said lip structure, and a pair of opposite side projections complementarily received and welded within said notched area.
15. The excavating apparatus of claim 14 wherein:
- said notched area has a generally semicircular configuration.
16. The excavating apparatus of claim 14 wherein;
- said notched area and said opposite side projections are welded to one another along a weld area disposed between said top and bottom sides of said lip and laterally offset from opposite sides of said wear member.
17. The excavating apparatus of claim 16 wherein:
- said wear member is an adapter having a nose portion projecting forwardly beyond said front edge portion of said lip, and
- said excavating apparatus further comprises a replaceable tooth point captively retained on said adapter nose.
18. The excavating apparatus of claim 14 wherein:
- said excavating apparatus is an excavating bucket.
19. The excavating apparatus of claim 14 wherein:
- no appreciable portion of said wear member extends rearwardly beneath said bottom side of said lip.
20. The excavating apparatus of claim 19 further comprising:
- first and second lip protectors secured to said front edge of said lip laterally adjacent opposite sides of said wear member and rearwardly extending along said bottom side of said lip.
21. A wear member for an excavating bucket or the like, comprising:
- an elongated body having a nose portion from which only a top leg rearwardly extends in a longitudinal direction; and
- a pair of mounting ears extending laterally outwardly from a lower side portion of said top leg adjacent its juncture with said nose portion.
22. The wear member of claim 21 wherein:
- said wear member is an adapter.
23. The wear member of claim 21 wherein:
- said mounting ears have arcuate rear side surfaces.
24. The wear member of claim 21 wherein:
- said mounting ears having downwardly and forwardly sloped top side surfaces on front portions thereof.
25. The wear member of claim 21 wherein:
- said mounting ears have generally planar top side surfaces and generally planar front side surfaces transverse to said top side surfaces.
26. The wear member of claim 21 wherein:
- each mounting ear has a forwardly projecting front portion that laterally outwardly projects past the balance of such mounting ear.
27. The wear member of claim 21 wherein:
- each mounting ear has laterally outwardly and downwardly sloped laterally outer side surface portions.
28. Excavating apparatus comprising:
- a lip having a top side, a bottom side and a front edge having a length;
- a plurality of wear members spaced apart along the length of said front edge, each wear member having a body longitudinally extending transversely to said front edge and having a top portion extending rearwardly along said top side, and a front portion extending forwardly beyond said front edge;
- cooperating mounting portions on said lip and said wear members disposed laterally outwardly of opposite sides of each wear member body and between said top and bottom sides of said lip, the cooperating mounting portions at each wear member overlapping in a front-to-rear direction and being fixedly secured to one another;
- a plurality of lip protectors inderdigitated with said wear members along said front edge of said lip; and
- mounting apparatus securing said lip protectors to said lip.
29. The excavating apparatus of claim 28 wherein:
- for each wear member said cooperating mounting portions comprise a pair of opposite side projections formed on the wear member and a recess extending rearwardly through said front edge of said lip and complementarily receiving said side projections.
30. The excavating apparatus of claim 28 wherein:
- at each wear member the associated cooperating mounting portions are welded to one another along a front weld area.
31. The excavating apparatus of claim 30 wherein:
- at each wear member no portion of its associated front weld area appreciably projects upwardly past said top side of said lip.
32. The excavating apparatus of claim 30 wherein:
- at each wear member its associated front weld area has a forwardly facing surface portion shielded by portions of said side projections.
33. The excavating apparatus of claim 30 wherein:
- each of said front weld areas has a forwardly facing surface portion, and
- the lip protectors on opposite sides of each wear member shield the front weld area.
34. The excavating apparatus of claim 28 wherein:
- at each wear member said cooperating mounting portions are welded to one another along a front weld area extending laterally outwardly from the wear member adjacent said front edge of said lip.
35. The excavating apparatus of claim 28 wherein:
- said excavating apparatus is an excavating bucket.
36. The excavating apparatus of claim 28 wherein:
- said wear members are adapters, and
- said front portions of said wear members are adapter noses.
37. The excavating apparatus of claim 28 wherein:
- no appreciable portions of said wear members extend rearwardly along said bottom side of said lip.
38. The excavating apparatus of claim 37 wherein:
- said lip protectors rearwardly extend directly along said bottom side of said lip.
39. The excavating apparatus of claim 28 wherein:
- said mounting apparatus includes weldments secured to said bottom side of said lip and interlocked with rear portions of said lip protectors.
40. The excavating apparatus of claim 28 wherein:
- said mounting apparatus includes telescoped connection portions formed on said lip and said lip protectors and having aligned fastening openings formed therein, and a fastening structure extending through said aligned fastening openings and removably intersecuring said connection portions.
41. The excavating apparatus of claim 28 wherein:
- said lip protectors extend along said bottom side of said lip and having openings therein,
- said lip has openings aligned with said openings in said lip protectors, and
- said lip protectors are captively retained on said lip by fastening structures extending upwardly through said aligned lip and lip protector openings.
42. The excavating apparatus of claim 28 wherein:
- said wear members have underside recesses therein with upper walls with first fastening openings extending upwardly therethrough,
- said lip protectors have opposite ends with upturned tab portions with outer side recesses therein, tab portions of lip protectors on facing ends of adjacent pairs of lip protectors projecting upwardly into said underside recesses with the facing outer side recesses of each adjacent tab pair forming second fastening openings within the underside recesses in said wear members, and
- fastening structures extending through said first and second fastening openings and securing said lip protectors to said wear members.
Type: Application
Filed: Dec 23, 2003
Publication Date: Jun 23, 2005
Inventor: Howard Robinson (Grapevine, TX)
Application Number: 10/744,124