RELATION TO OTHER PATENT APPLICATION This application is a continuation-in-part of Ser. No. 10/924,393, filed Aug. 24, 2004, with the same title, now U.S. patent Ser. No. ______.
TECHNICAL FIELD The present disclosure relates generally to bucket assemblies used with machines, and more specifically to edge protector assemblies for the bucket assemblies.
BACKGROUND Machine implements, such as bucket assemblies for mining equipment, are subjected to high wear due to the harsh environment in which they operate. Specifically, portions of the bucket assembly, such as side bars, that penetrate the ground and/or material which is to be moved are subjected to the greatest amount of wear. A worn side bar can be relatively expensive and time consuming to replace. Because the side bars are generally made from steel and are welded to the bucket assembly, a worn portion of the side bar must be cut out of the bucket assembly and a new portion welded into place. Thus, many bucket assemblies include side bar protectors that are attached to an edge of the side bar that penetrates the material. The side bar protectors are much more economical and less time consuming to replace than the side bar, itself.
Often, side bar protectors are removeably attached to the edges of the side bars by connectors, such as brackets, that are welded or bolted to the side bars. For instance, a side bar protector assembly set forth in U.S. Pat. No. 5,016,365, issued to Robinson, on May 21, 1991, includes side bar protectors with U-shaped cross sections that are attached to mounts welded to a bucket assembly. The mounts fits inside of the side bar protectors and are secured by pins extending through aligned apertures of the mount and side bar protector. The U-shaped cross-section allows the side protectors to wrap around the bucket edge.
Although side bar protectors, such as the Robinson protector, protect the side bar edge from wear, many side bar protector assemblies are substantially wider than the side bar, and thus, create an overhang into the bucket assembly. The overhang of the protector can trap material between the protector and the side bar wall. The material trapped in the bucket is commonly referred to as carry back, and reduces the productivity of the work machine.
Moreover, although side bar protectors are more economical to replace than the side bar, the side bar protectors are also subjected to wear. During operation of the bucket assembly, the side bar protector will be repeatedly subjected to various loads and impacts. If the loads are not adequately transferred to the bucket assembly through the brackets, the loads can cause a fastener assembly, often consisting of a nut threaded to a bolt, to shear and fail. For instance, an interface between the mount and the Robinson side bar protector may not provide sufficient contact surface in order to adequately transfer the loads to the bucket assembly, rather than through the pin securing the assembly.
Further, due to wear, the side bar protectors must be periodically replaced or repositioned. The detachment and reattachment of the protectors can consume valuable time in which that the work machine could be operating. In addition, at least two tools are often required; one to hold a nut from rotating while another is used to rotate the bolt.
SUMMARY OF THE DISCLOSURE In one aspect, an edge protector for use with a bucket includes an edge protector with a wear surface contiguous with a back surface, a front surface, a lower surface, and an upper surface. The edge protector includes a tapered male mating segment with a fastener receiving bore therethrough. The lower and upper surfaces of the edge protector are parallel to each other.
In another aspect, an edge protector assembly includes an edge protector with a wear surface contiguous with a back surface, a front surface, a lower surface and an upper surface. The edge protector includes a tapered male mating segment with a fastener receiving bore therethrough. A connector bracket includes a bucket contact surface, a tapered female mating segment with a fastener receiving bore therethrough and sized for mating to the tapered male mating segment of the edge protector. A fastener assembly that includes a nut and a bolt clamps the mating portions together.
In still another aspect, a method of protecting an edge of a bucket includes attaching a connector bracket to a side of the bucket. The edge protector is positioned on the connector bracket by mating a tapered female segment to a tapered male segment. A bolt is advanced through the male and female tapered segments. The tapered segments are clamped together by attaching a nut to the bolt.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic representation of a bucket assembly, according to the present disclosure;
FIG. 2a is a partial perspective diagrammatic view of an outer surface of an edge protector assembly attached to the bucket assembly of FIG. 1;
FIG. 2b is a partial perspective diagrammatic view of an inner surface of the edge protector assembly attached to the bucket assembly of FIG. 1;
FIG. 3 is a cross-sectional top diagrammatic representation of the edge protector assembly attached to the bucket assembly of FIG. 2;
FIG. 4 is a cross-sectional side diagrammatic representation of the edge protector assembly, according to a first embodiment of the present disclosure;
FIG. 5 is an exploded diagrammatic view of a connector and fastener assembly of the edge protector assembly of FIG. 4;
FIG. 6 is an exploded diagrammatic view of a connector and fastener assembly of an edge protector assembly, according to a second embodiment of the present disclosure;
FIG. 7a is an isometric diagrammatic view of an edge protector included within an edge protector assembly, according to a third embodiment of the present disclosure;
FIG. 7b is an isometric cross-sectional view of the edge protector of FIG. 7a mated to a connector;
FIG. 8 is an isometric diagrammatic view of the connector of FIG. 7b;
FIG. 9 is an isometric diagrammatic view of a fastener assembly mated to a connector, according to the third embodiment of the present disclosure;
FIG. 10 is an isometric diagrammatic view of a bucket assembly according to still another embodiment of the present disclosure; and
FIG. 11 is a sectioned view of the edge protector assembly of FIG. 10.
DETAILED DESCRIPTION Referring to FIG. 1, there is shown a diagrammatic representation of a bucket assembly 10, according to the present disclosure. The bucket assembly 10 is designed as a machine implement for use with various machines, including, but not limited to, mining shovels, excavators and wheel loaders. Thus, although an excavator type bucket is shown, this disclosure contemplates other bucket types, such as loader buckets. As used in this document the term “bucket” also encompasses bulldozer blades that include side walls with edges for protecting from wear. The bucket assembly 10 includes a bucket 11 that is defined, in part, by two identical sides 47 separated from one another by a middle section 13. Identical side bars 12 are attached to both sides 47. The middle section 13 may be formed from one piece of material or several pieces welded to one another. The side bars 12 and middle section 13 are generally made from a relatively strong material, such as steel plate. Teeth can be attached across a front of the middle section 13 and the side bars 12 in order to help penetrate the material being loaded and moved. Each side bar 12 includes a width 12a. The present disclosure contemplates side bars 12 of various widths, including, but not limited to, side bars up to and exceeding three inches thick. Each side bar 12 includes an inner side wall surface 14 with an edge 15. Identical edge protector assemblies 16 are attached to each edge 15 of the side wall surfaces 14 by at least two connector brackets 17. Each edge protector assembly 16 is attached to the edge 15 at a position where the bucket 11 repeatedly penetrates material and debris, and can be made from the same or different material than the side bars 12.
Referring to FIG. 2a, there is shown a side view of an outer surface 16a of the edge protector assembly 16 attached to the bucket assembly 10 of FIG. 1. Although the present disclosure will be discussed for one edge protector assembly 16, it should be appreciated that the discussion can apply to both edge protector assemblies. The edge protector assemblies 16 are identical to one another, and thus, can be switched between the two side bars 12. The edge protector assembly 16 includes an edge protector 18 secured to the connector brackets 17 via fastener assemblies 19. The connector brackets 17 can be attached to the side bars 12 in various ways, but preferably are welded to an outside surface of the side bars 12 via the single flange 20. Although the present disclosure contemplates any number of connectors 17 per edge protector 18, preferably there may be at least two connectors 17 in order to limit the movement of the edge protector 18 relative to the connectors 17. The connectors 17 are illustrated as brackets. Although the brackets 17 are illustrated as including a single flange 20 and protective shield 21, the present disclosure contemplates brackets without flanges or protective shields. The protective shield 21 is designed to protect from wear a portion of the fastener assembly 19 that extends past the edge protector assembly 16. Although the edge protector 18 is illustrated as straight for use with bucket assemblies for work machines, such as relatively large wheel loaders, it should be appreciated that the present disclosure contemplates edge protectors with various other shapes, such as a curved shape (as shown in FIG. 7a).
Referring to FIG. 2b, there is shown a side view of an inner surface 16b of the edge protector assembly 16 attached to the bucket assembly 10 of FIG. 1. In the illustrated embodiment, the side bar 12 includes a corner 48 attached to the front of the bucket assembly 10 that includes the teeth. It is known in the art to attach a corner protector 49 onto the edge 15 of the corner 48 in order to protect the corner 48 when penetrating material and debris. In the illustrated embodiment, the edge 15 includes a front portion 50 that is serrated and mates with a corresponding serrated surface 51 of the protector 49, and a top portion 53. The edge protector assembly 16 preferably includes a tooth 52 that mates under a protrusion 54 of the corner protector 49 that extends over and protects the top portion 53 of the edge 15. Because the tooth 52 fits against the protrusion 54 of the corner protector 49, the corner protector 49 can share a side load with the edge protector assembly 16. The load can be transferred between the edge protector assembly 16 and the corner protector 49. It should be appreciated that the present invention contemplates the use of the tooth 52 with straight edge protector assemblies as shown in FIGS. 2a and 2b.
Referring to FIG. 3, there is shown a partial cross-sectional top diagrammatic representation of the edge protector assembly 16 attached to the bucket assembly 10 of FIG. 2. The edge protector assembly 16 includes an overhang area 22 extending from the side wall surface 14 into the bucket 11, a protection portion (not shown) covering a protection area 25 of the edge 15, and an outer area 24 extending from an outer surface of the side bar 12 away from the bucket 11. In all embodiments, the inner overhang area 22 is between zero (flush) and one half of the protection area 25 of the edge 15. Although the inner overhang area 22 is illustrated as being one half of the protection area 25, preferably, the inner overhang area of the edge protector assembly 16 is zero percent of the protection area 25, meaning that the edge protector assembly 16 is flush with the surface side wall 14 and there is no inner overhang. Although the outer area 24 is also illustrated as one half of the protection area 25, the present disclosure contemplates the edge protector assembly with an outer area being of various sizes, or no outer area. It should be appreciated that the greater the width 12a of the side bar 12, the more likely the edge protector assembly 16 will be flush with the side wall surface 14. The greater width can provide more room for the brackets 17 that must be sufficiently thick to mate with and support the edge protector 18. For instance, the present disclosure contemplates the edge protector assembly (as shown in FIGS. 7-9) being flush with the side wall surface 14 when attached to a three-inch wide side bar, like the side bars used in relatively large mining loaders, shovels and excavators. However, when used to protect one inch side bars 12, similar to the side bars of wheel loaders, the edge protector assembly 18 (illustrated in FIG. 3) can include up to the inner overhang area 22 that is one half of the protection area 25.
Referring to FIG. 4, there is shown a cross-sectional side diagrammatic representation of the edge protector assembly 16, according to a first embodiment of the present disclosure. Although the section is through one bracket 17, it should be appreciated that the section through all of the brackets 17 mated to the edge protector 18 are identical. The bracket 17 includes a first or female mating portion 26 that is mated to a second or male mating portion 27 of the edge protector 18. In the illustrated embodiment, there are as many second mating portions 27 as there are brackets 17. However, it should be appreciated that the edge protector could include only one second mating portion extending between brackets. Although the first mating portion 26 of the bracket 17 includes a tapered cavity 29 and the second mating portion 27 includes a protrusion 30 with a tapered section 31 corresponding to the tapered cavity 29, it should be appreciated that the present disclosure contemplates the brackets including protrusions or male mating portion(s) and the edge protector including the tapered cavity or female mating portion(s) for receiving the protrusion. The tapered cavity 29 of the bracket 17 and the tapered section 31 of the protrusion 30 preferably include identical taper angles 32. The identical taper angles 32 provide an increased contact surface area at an interface 28 between the bracket 17 and the edge protector 18, thereby reducing stress at the interface 28 caused by loads acting on the assembly 16 during operation by spreading loads over a larger contact area. Because of the close fit between the bracket 17 and the edge protector 18, a side load (as illustrated by the arrow) acting on the edge protector 18 can transfer to the brackets 17 without shearing the fastener assembly 19.
The fastener assembly 19 includes a fastener 33 extending through a bore 34 defend by the first and second mating portions 26 and 27, and a barrel member 35 mated to the fastener 33. The fastener 33 preferably includes a bolt that is mated to the barrel member 35, which preferably includes a nut. An inner wall 36 of the bore 35 and an outer surface 37 of the bolt 33 define an annular clearance 38. Thus, the bolt 33 is not in contact with the edge protector 18, thereby avoiding sheer loads on the bolt 33. A load acting on a top of the edge protector 18 can be transferred to the side bar 12 through the brackets 12, and not to the bolt 33. Thus, the protector 16 and the bracket 17, and not the bolt 33, will wear. When secured, the fastener assembly 19 acts to clamp the protrusion 27 in the cavity 29.
Referring to FIG. 5, there is shown an exploded view of the bracket 17 and the fastener assembly 19 of FIG. 4. Although the disclosure is described for one bracket 17 and fastener assembly 19, it should be appreciated that the following description applies to all of the brackets and fastener assemblies. Further, it should be appreciated that when the bracket 17 is mated to the edge protector 18, the protrusion 27 of the edge protector 18 is aligned in the tapered cavity 29 of the bracket 17. The fastener assembly 19 includes a rotational locking feature 39 that is operable to prohibit rotation of one of the bolt 33 and the nut 35 relative to the brackets 17. According to the first embodiment, the rotational locking feature 39 prohibits the rotation of the bolt 33 via an interaction between the bolt 33 and the bracket 17. The portion of the bore 34 defined by the bracket 17 includes a receiving bore 40 and a counter bore 41. The receiving bore 40 includes a square receiving portion 43 with a rotation stopping surface 42 and that accepts a correspondingly square shaped shoulder 44 of the bolt 33. The bolt 33 is illustrated a conventional plow bolt which includes the square shaped shoulder 44 below a head 45 of the bolt 33. A contact surface 46 of the square shoulder 44 of the plow bolt 33 mates with the rotation stopping surface 42 within the receiving bore 40. Thus, one individual can mate the nut 35 to the bolt 33 with the use of a single tightening tool to rotate nut 35 while bolt 33 remains stationary. A second tool used to prevent the bolt 33 from rotating is not necessary. The plow bolt head 45 is flush with the edge protector 18 and bracket 17 when secured.
Referring to FIG. 6, there is shown an exploded view of the bracket 17 and a fastener assembly 119. It should be appreciated that when the bracket 17 is mated to the edge protector 18, the protrusion 30 of the edge protector 18 is aligned in the tapered cavity 29 of the bracket 17. The fastener assembly 119 of the second embodiment is similar to the fastener assembly 19 of the first embodiment in that a plow bolt 133 with the square shaped shoulder 44 is received into the receiving bore 40. However, a nut of the fastener assembly 119 is not a conventional nut, but includes a threaded retainer 135 that includes a threaded bore 135a. The threaded retainer 135 is received into the counter bore 41 defined by the bracket 17, and a head 135b rests on a retainer shoulder within the bore 41. The head 135b of the retainer 135 is flush with the edge protector 18 and defines a drive feature (not shown) to enable the flush retainer 135 to be rotated via a suitable tool. Thus, the fastener assembly 119 is flush with both sides of the bracket 17 when secured. The retainer 135 extends partially through the portion of the bore 34 defined by the edge protector 18 (not shown). A threaded portion 149 of the plow bolt 133 is operable to mate with the threaded bore 135a of the retainer 135 within the portion of the bore 34 defined by the edge protector 18 (not shown) in order to secure the edge protector 18 to the bracket 17. Just as in the first embodiment, the contact surface 46 of the bolt shoulder 44 mates with the rotation stopping surface 42 within the receiving bore 40 in order to stop the rotation of the bolt 133. A tool is used to rotate retainer 135 relative to bolt 133 to secure the same.
Referring to FIGS. 7a and 7b, there are shown a side view of the edge protector 218, and a cross-sectional view of an edge protector 218 mated to bracket 217, respectively, according to a third embodiment of the present disclosure. Whereas the second mating portion 27 of the edge protector 18 in the first and second embodiments includes the protrusion 30 with the tapered section 31, a second mating portion 227 of the edge protector 218 in the third embodiment includes a tapered cavity 229 for each bracket 217. The portion of the bore 233 defined by the edge protector 218 includes a receiving bore 240 and a counter bore 241. The edge protector 218 is illustrated as curved and symmetrical with a first end 218a and a second end 218b. Because both ends 218a and 218b of the edge protector 218 are identical, the edge protector 218 is reversible between a first end wear position orientation and a second end wear position orientation with the bucket. In the first end wear position orientation, the first end 218a is positioned nearest the ground. In the second end wear position orientation, the second end 218b is positioned nearest the ground. During operation of the bucket assembly, it has been found that the end 218a or 218b nearest the ground is subjected to more wear than the end 218a or 218b farther from the ground. Thus, due to the symmetry of the edge protector 218, when the end 218 or 218b nearest the ground wears, the edge protector 218 can be rotated rather than replaced. Moreover, due to the symmetry, the edge protectors 218 can be switched between side bars 12. Not only does the symmetry extend the life of the edge protector 218, it ensures proper attachment of the edge protectors 218 to the bucket assembly 10. The curved edge protectors 218 are typically designed for use with relatively large shovels and excavators. Although not illustrated, it should be appreciated that the present disclosure contemplates the curved protectors including the tapered protrusions mating with tapered cavities of the brackets.
Referring to FIG. 8, there is shown an isometric view of the bracket 217, according to the third embodiment of the present disclosure. A first mating portion 226 of the bracket 217 includes a protrusion 230 with a tapered section 231 corresponding to the tapered cavities 229 of the edge protector 218 of FIGS. 7a and 7b. Both the tapered section 231 of the protrusion 230 and the tapered cavities 229 include identical taper angles 232, providing an increase contact surface area at an interface between the bracket 217 and the edge protector 218. Although the bracket 217 is illustrated without a flange the bracket could include a flange. Without the flange, the edge protector 218 is flush with the bucket 11.
Referring to FIG. 9, there is shown an isometric view of a fastener assembly 219 extending through the bracket 217, according to the third embodiment of the present disclosure. It should be appreciated that when the edge protector 218 is mated to the bracket 217, the protrusion 230 is surrounded by the edge protector 218. The fastener assembly 219 includes a retainer system thoroughly described in U.S. Pat. No. 6,712,551 B2, issued to Livesay et al., on Mar. 30, 2004. The nut of the fastener assembly 219 is not a convention nut, but rather a threaded retainer 235 that defines a threaded bore 235a. The retainer 235 is positioned within the portion of the bore 234 defined by the bracket 217, and partially into the receiving bore 241 of the edge protector 218. Thus, the retainer 235 is hidden in the assembled edge protector assembly 216. The retainer 235 includes a contact surface 246 operable to mate with a rotation stopping surface of an inner surface of the edge protector (not shown). A head 245 of the bolt 233 includes a drive feature 245a that mates with a suitable tool that is operable to rotate the bolt 233. Thus, a conventional bolt 233 can be threaded into the threaded bore 235a of the retainer 235 with a suitable tool as the retainer 235 is held stationary by the interaction between the contact surface 246 of the retainer 235 and the rotation stopping surface of the edge protector 218. The fastener assembly 219 is flush with the edge protector 218 on both the sides of the edge protector 218.
Referring to FIG. 10, a bucket assembly 310 according to another embodiment of the present disclosure includes an edge protector assembly 316 that is connected to the side 312 of bucket 311 via a single bracket connector 317, rather than two connector brackets as in the previous embodiments. This embodiment recognizes that a majority of the wear occurs in the vicinity of corner protector 341 near the bottom of bucket 311. However, by shaping the edge protector 319 to have a parallelogram shape, any number of edge protectors 319 can be mounted on one side 312 of bucket 311 to provide whatever length of wear protection is called for. In FIG. 10, a second edge protector assembly 350 is shown in shadow stacked on the first edge protector assembly 316. The edge protector assembly 316 of FIGS. 10 and 11 also differs from the previous embodiments in that the edge protector 319 includes a shield or eye brow 321 that protects the nut end of fastener assembly 342 from potential destructive collision with rocks or other material when the bucket is pushed through material during conventional operation. In other words, eye brow 321 deflects material away from collision with nut 344 and bolt 343. As best shown in FIG. 11, edge protector 319 includes a wear surface 322 that is slanted across its width to urge material into bucket 311, which also differentiates it from the symmetrical wear surfaces shown in the previous embodiments.
The wear surface 322 of edge protector 319 is contiguous with a lower surface 324, and upper surface 323, a front surface 326 and a back surface 325. In order to better facilitate stacking of more than one edge protector assembly 316, the lower and upper surfaces 324 and 323 are parallel to one another. This angle is also preferably such that it matches the angle of the corner of the upper surface of corner protector 341 as best shown in FIG. 10. Thus, the edge protector assembly 316 of FIGS. 10 and 11 has versatility of its own and different features from that described earlier, but does not include the symmetry features described earlier so that the left and right edge protector assemblies would have mirror image shapes to one another, and are thus not interchangeable between sides as in the previous embodiments.
As with the previous embodiments, the edge protector 319 is attached to the bucket 311 by first positioning connector bracket 317 at a suitable location, such as at a location where the edge protector 319 will abut the upper surface of corner protector 341 as shown in FIG. 10. Next, the single flange, 331 of the bracket connector 317 is welded to the outer surface 312 of bucket 311. Next, the male mating protrusion 330 is mated to the female mating cavity 338 to seat the tapered protrusion in the tapered cavity as in the previous embodiments. Next, a bolt of a fastener assembly 342, which is preferably a plow bolt 343 with a square rotational locking feature is advanced through the fastener receiving bores 334 and 318 of the bracket 317 and edge protector 319, respectively. A nut 344 is then mated to bolt 343 and clamps the mating portions 330 and 338 together as shown in FIG. 1. As in the previous embodiments, the fastener receiving bore 318 may be sufficiently large as to define a clearance area between the edge protector 319 and the fastener assembly 343 so that the two do not touch, thus avoiding the transfer of shear loads from the edge protector 319 to the fastener assembly 342. Although not necessary, the front surface 326 as well as the inner surface of bracket connector 317, head of bolt 343 are all flush with the inner surface 313 of bucket 311.
INDUSTRIAL APPLICABILITY Referring to FIGS. 1-9, the operation of the present disclosure will be discussed for bucket assembly 10. It should be appreciated that the present disclosure contemplates the bucket assembly being attached to various types of machines, including, but not limited to, wheel loaders, mining shovels, excavators, and bulldozer blades with side edges. The present disclosure is also applicable to smaller buckets, including but not limited to skid steer loader buckets. Although a method of protecting the edges 15 of bucket assembly 10 will be discussed for only one edge 15, it should be appreciated that the method is the same for protecting both edges 15.
In order to protect the edge 15 of the bucket assembly 10, the edge protector assembly 16, 116, 216 is attached to the edge 15. The edge protector 18, 218 can be attached to the brackets 17, 217 by the work machine operator in the field, if necessary. The brackets 17, 217 are welded onto the side bar 12, and the edge protector 18, 218 is mated to the brackets 17, 217. In order to secure the edge protector 18, 218 to the brackets 17, 217, the fastener assembly 19, 119, 219 extends through the bore 34, 234. In the first and second embodiments in which the brackets 17 define the receiving bore 40 and the counter bore 41, the plow bolt 33, 113 is inserted in the receiving bore 40, and the nut, being either the conventional nut 35 in the first embodiment or the threaded retainer 135 in the second embodiment, is threaded onto the threaded portion 49, 149 of the plow bolt 33, 133. Referring specifically to FIG. 5, the plow bolt 33 in the first embodiment extends through both the receiving bore 40 and the counter bore 41, and the nut 35 is threaded to the plow bolt 33 in the outer area 24 of the edge protector assembly 16. The rotational locking feature 39 prevents the rotation of the bolt 33 via the interaction between the contact surface 46 on the square shaped shoulder 44 of the bolt 33 and the rotation stopping surface 42 of the receiving bore 40. Thus, the nut 35 can be secured to the stationary bolt 33 using a suitable tool, such as a wrench, to rotate the nut 35. When the nut 35 is securely fastened to the bolt 33, the fastener assembly 19 is flush with the inner surface of the edge protector 18, but not the outer surface of the edge protector 18.
Referring specifically to FIG. 6, in the second embodiment, the plow bolt 133 extends through the receiving bore 40 and the portion of the bore 34 defined by the protrusion 30 of the edge protector 18. Within the bore 34, the threaded bore 135a of the retainer 135 is linked with the threaded portion 149 of the bolt 133 by rotating the retainer 135 with a suitable tool, such as an allen wrench, mated to the drive feature. Similar to the first embodiment, only one tool is needed to link the threaded retainer 135 with the bolt 133 because the contact surface 46 of the square shaped shoulder 44 of the bolt 133 mates with the rotation stopping surface 42 within the receiving bore 40. Thus, the rotational locking feature 39 prohibits the rotation of the bolt 33 via the interaction between the bolt 133 and the bracket 17 when the retainer 135 is being tightened. Both sides of the fastener assembly 119 are flush with the edge protector 18.
Referring specifically to FIG. 9, according to the third embodiment, the operator can secure the edge protector 218 to the brackets 217 similarly to the first and second embodiments except that the receiving bore 240 and the counter bore 241 are defined by the edge protector 218 rather than the brackets 217. The threaded retainer 235 is positioned within the portion of the bore 234 that is defined by the bracket 217, and the bolt 233 is threaded into the threaded bore 235a of the retainer 235. The threaded retainer 235 is prevented from rotating by the interaction between the contact surface 246 defined by the edge protector 218 and the rotation stopping surface 242 of the threaded retainer 235. Thus, the fastener assembly 219 can be linked by rotating the bolt 233 with one suitable tool while the rotational locking feature 239 prevents the threaded retainer 235 from rotating. The fastener assembly 219 is flush with both sides of the edge protector 218.
In all embodiments of FIGS. 1-9, the edge 15 of the bucket assembly 10 is also preferably protected by avoiding shear loads on the fastener assembly 19, 119, 219, at least in part, by positioning the bolt 33, 133, 233 out of contact with either the edge protector 19, 219 or the brackets 17, 217. Referring specifically to FIG. 4, the annular clearance 38 defined the inner surface of the bore 34 and the outer surface of the bolt 33 allows the loads acting on the edge protector assembly 16 to be transferred to the brackets 17 rather than the fastener assembly 19. Loads acting on top of the edge protector assembly 16 will be transferred to the bucket side bar 12, and will avoid the fastener assembly 19 due to the annular clearance 38. Thus, the loads acting on the edge protector assembly 19 can be transferred to bucket assembly 10 through the edge protector 18 and not the fastener assembly 19. Although the method of avoiding shear loads on the fastener assembly 19 is described and illustrated for the first embodiment, it should be appreciated that the method operates similarly in all embodiments. However, according to the third embodiment (as shown in FIGS. 7-9), the edge protector 218 defines the receiving and counter bores 240 and 241, respectively, and thus, an annular clearance 238 is defined by the fastener assembly 219 and the brackets 217. The fastener assembly 219 is preferably separated from the brackets 217 via the annular clearance 238. In all embodiments, because shear loads on the fastener assembly 19, 119, 219 are avoided, the likelihood of premature failure of the fastener assembly 19, 119, 219 is reduced.
In all embodiments of FIGS. 1-9, the edge 15 of the bucket assembly 10 is preferably protected by reducing stress at the interface 28 between the brackets 17, 217 and the edge protector 18, 218. The stress is reduced by contacting at the interface 28 identical taper angles 32, 232 of the corresponding mating portions 26, 226 and 27, 227 of the brackets 17, 217 and edge protector 18, 218, respectively. Regardless of whether the mating portion 27, 227 includes the protrusion 30 or the tapered cavity 229, the edge protector 18, 218 can be mated with the brackets 17, 217. The identical taper angles 32, 232 increase the contact surface area at the interface 28, thereby allowing the loads to transfer from the edge protector 18, 218 to the brackets 17, 217 welded to the bucket assembly 10. Thus, a load acting along the length of the edge protector assembly 16, 216 can also be transferred to the brackets 17, 217 and avoid the fastener assembly 19, 119, 219 due to the close fit between the bracket 17, 217 and the edge protector 18, 218. Moreover, in the embodiments including the straight edge protectors 18, the tooth 52 that mates with the protrusion 54 of the corner protector 49 allows a load acting along the length of the assembly 16 to also be transferred to the corner protector 49.
Referring specifically to FIG. 3, the edge protector assembly 16, 116, 216 protects the edge 15 of the bucket assembly 10 while also reducing carry back by limiting the inner overhang area 22 of the edge protector assembly 16, 116, 216. Although preferably the edge protector assembly 16, 116, 216 does not include the inner overhang area 22, and thus, is flush with the side wall surface 14 of the bucket assembly 10, the present disclosure contemplates and is illustrated in FIG. 2 as including the inner overhang area 22 that is up to one half of the protected area 25 of the edge 15. Regardless of whether the inner overhang area is zero or half of the protected area 25 of the edge 15, the inner overhang area 22 is sufficiently small that its extension into the bucket 11 does not trap a significant amount of material in the bucket 11. Rather, the material can slide down the side surface wall 14 and the edge protector assembly 16, 116, 216, and out the bucket assembly 10. Because all the material being transported can be ejected from the bucket 11, the productivity of the work machine having bucket assembly 10 is increased.
The present disclosure is advantageous because the edge protector assembly 16, 116, 216 not only protects the edge 15 of the bucket assembly 10, but also can be replaced by one man with relative ease, absorbs the loads that may act on the assembly 16, 116, 216 during operation, and limits carry back. Because the edge protector assembly 16, 116, 216 is attached to the edge 15 at a position where the bucket assembly 10 engages material, the edge protector 18, 218 protects the edge 15 from rocks and debris that could damage the side bars 12. Thus, over time, the edge protector assembly 16, 116, 216, rather than the side bars 12, will wear. It is more economical and less time consuming to replace the edge protector assemblies 16, 116, 216 than the side bars 12. In fact, the curved edge protectors 218 can be rotated such that the end 218a or 218b that was receiving less wear can be placed in the position in which it will receive the most wear.
The present disclosure further allows the work machine operator in the field to rotate the position, or replace, the edge protectors 18, 218. Because each embodiment includes the rotational locking feature 39, 239 that prevents the rotation of either the nut 235 or the bolt 33, 133, a second tool to hold the nut 235 or bolt 33, 133 stationary when linking the fastener assembly 19, 119, 219 is unnecessary. Thus, only one suitable tool used by one individual is needed. The fact that the edge protector assembly 16, 116, 216 can be replaced or rotated with relative ease by one person further reduces the amount of maintenance time and costs associated with the edge protector assemblies 16, 116, 216.
Moreover, the edge protector assembly 16, 116, 216 does not adversely affect the productivity of the bucket assembly 10. Because the edge protector assembly 16, 116, 216 is preferably flush with the side wall surface 14 and, at most, slightly extended into the bucket 11, material that is being shoveled can be ejected from the bucket 11 without a portion being trapped between the inner overhang 22 and the side wall surface 14. Thus, the present disclosure limits carry back of material and allows use of the maximum capacity of the bucket 11, thereby increasing the productivity of the work machine having bucket assembly 10.
The present disclosure also increases the life of the edge protector assembly 16 by avoiding shear loads on the fastener assembly 19, 119, 219 and reducing stress at the interface 28 between the brackets 17, 217 and the edge protector 18, 218. The fastener assembly 19, 119, 219 is not designed to withstand the loads that the edge protector 18, 218, the brackets 17, 217, and the bucket assembly 10 can withstand. If the fastener assembly 19, 119, 219 fails, the edge protector assembly 16, 116, 216 will fail to protect the edge 15. Thus, the present disclosure reduces the risk of premature failure of the fastener assembly 19, 119, 219 by separating the fastener assembly 19, 119, 219 from either the bracket 17, 217 or the edge protector 18, 218 by the annular clearance 38, 238, thereby reducing the loads transferred to the fastener assembly 19, 119, 219. Moreover, the present disclosure reduces the stress concentrated at the interface 28 between the bracket 17, 217 and the edge protector 18, 218 by increasing the contact between the tapered cavity 29, 229 and the tapered section 31, 231 of the protrusion 30, 230. Regardless of whether the bracket 17, 217 or the edge protector 18, 218 includes the tapered cavity 29, 229, the side loads acting on the edge protector 18, 218 can be transferred to the brackets 17, 217 rather than the bolt 33, 133, 233. Thus, the present disclosure extends the life of the edge protector assembly 16, 116, 216, thereby reducing costs.
Referring now specifically to FIGS. 10 and 11, its attachment and protection strategy of the bucket edge is somewhat similar to the previously described embodiments. For instance, the edge 315 of a bucket is protected by first attaching a connector bracket 317 to the outside surface of the bucket side 312, preferably by welding the single flange 331 of bracket connector 317 to the outer surface of bucket side 312 at weld 335. Next, the male and female mating surfaces 330, 338 are mated as shown in FIG. 11, in the preferred embodiment, these mating features include identically angled tapered male portion 330 for the edge protector 319 an identical tapered cavity or female mating portion 338 formed as part of bracket connector 317. A bolt 343 is then advanced through the fastener receiving bores 334 and 318 of the female and male tapered portions 330, 338, respectively. The male and female portions 330, 338 are then clamped together by attaching a nut 344 to the bolt 343. The attachment of the nut 344 to the bolt 343 is better facilitated in the illustrated embodiment by holding the bolt 343 against rotation via an interaction between the connector bracket 317 and the bolt 343, such as by utilizing a plow bolt and a counterpart surface as described earlier. The nut 344 and exposed end, if any, of bolt 343 are protected by a shield 321 formed on edge protector 319, that causes debris to be deflected away from collision with the fastener assembly 342.
If an extended length of protection is desired for the bucket assembly 310, two or more identical edge protector assemblies 316, 350 can be stacked atop one another as shown in shadow in FIG. 10. As in the previous embodiment, the fastener receiving bore 318 through the edge protector 319 may be sufficiently large to avoid contact with the fastener assembly 342, so as to avoid shear loads on the bolt 343 by maintaining the fastener assembly 342 out of contact with the edge protector 319. The edge protector assembly 316 of FIGS. 10 and 11 also provides for a slight increase to productivity by forming the wear surface 322 in a way to urge material into the bucket, rather than a symmetrical wear surface as shown in the previous embodiments. In order to better reduce carry back and ease of operation, the head of bolt 343, the inner surface of bracket connector 317 and the front surface 326 of edge protector 319 may all be flush with the inner surface 313 of the bucket 311.
It should be understood that the above description is intended for illustrative purposes only, and is not intended to limit the scope of the present disclosure in any way. In addition, of the edge protector and the connector bracket may be reversed in any of the embodiments without department from the intended scope of the present disclosure. For instance, a taper according to the present disclosure could include one side parallel with the side of the bucket. Thus, those skilled in the art will appreciate that other aspects, objects, and advantages of the disclosure can be obtained from a study of the drawings, the disclosure and the appended claims.
