Patent Application
20160160476
The present disclosure relates generally to a shroud for a work implement and, more particularly, to a shroud that can be quickly and easily replaced when worn.
Earth-working machines, such as wheel loaders, cable shovels, excavators, and front shovels, include implements generally used for digging into, ripping, or otherwise moving earthen material. These implements are subjected to abrasion and impacts that cause them to wear. To prolong the useful life of the implements, various shrouds can be connected to the earth-working implements at areas experiencing the wear. These shrouds are replaceably connected to the implements using a retention system.
An exemplary shroud is disclosed in U.S. Patent Publication 2004/0098887 of Livesay that published on May 27, 2004 (“the '887 publication”). Specifically, the '887 publication discloses a protector for a sidebar of a bucket. The protector has a V-shaped cross-section and extends in a linear direction along an edge of the sidebar. A mounting element having “T” or “dovetail” configuration is welded to the edge of the bucket sidebar, and the protector is then slid into place over the mounting element such that a vertex of the V-shape is oriented away from the mounting element. A fastener passes through the vertex at a lengthwise center of the protector to engage the mounting element, thereby inhibiting undesired sliding of the protector that would decouple the protector from the mounting element.
Although acceptable for some applications, the protector of the '887 publication may not have broad applicability. Specifically, the protector may not be compatible with a bucket having a curved sidebar. In addition, locating the mounting element on the edge of the sidebar may not be sufficiently durable and/or accessible in some instances.
The disclosed shroud is directed to overcoming one or more of the problems set forth above.
According to one exemplary aspect, the present disclosure is directed to a shroud for use with a work implement. The shroud may include an elongated body configured to straddle an edge of the work implement, and a mounting portion extending from a side of the elongated body. The mounting portion may have a back defining an opening, a first side connected to the back, and a second side connected to the back opposite the first side. The mounting portion may also have at least one tab extending inwardly from the back of the mounting portion at a location adjacent the opening and between the first and second sides. The at least one tab may be configured to removably couple the shroud to a mounting base attached to the work implement.
According to another exemplary aspect, the present disclosure is directed to a side shroud. The side shroud may include an elongated body being arcuate along its length, and having a vertex and spaced apart first and second legs that are connected to the vertex. The side shroud may also include a first protrusion extending inward at a first end of the elongated body, a second protrusion extending inward at a second end of the elongated body, and a mounting portion extending from the first leg. The mounting portion may have be formed from a back, a first side, and a second side. The mounting portion may include a first tab located at a first end of the mounting portion proximate the first leg of the elongated body, a second tab located at a second end of the mounting portion distal from the first leg, and a window formed in the back between the first and second tabs.
According to yet another exemplary aspect, the present disclosure is directed to a side shroud assembly for a work implement having a floor and first and second curved sides connected to the floor. The side shroud assembly may also include a base weldable to an external surface of the first curved side, and a shroud having an elongated body. The elongated body may be arcuate along its length, and have a vertex and spaced apart first and second legs that are connected to the vertex. The shroud may also have a first protrusion extending inward at a first end of the elongated body, a second protrusion extending inward at a second end of the elongated body, and a mounting portion extending from the first leg and having a window. The shroud assembly may further include a locking mechanism configured to pass through the window of the mounting portion and engage the base, thereby locking the shroud to the first curved side of the work implement.
Work implement 12 may embody any device used to perform the task assigned to machine 10. For example, work implement 12 may be a loading bucket (shown in
During use of machine 10, work implement 12 may be driven forward into a pile 22 of material, with floor 14 generally parallel with a ground surface 24. The operator may then lift work implement 12, causing additional material to spill into the enclosed space, and begin racking work implement 12 backward to a carry position. When this happens, the material loaded onto the front edge of floor 14 may fall further into work implement 12 and spread towards left and right side walls 18, 20. It has been found that, in some applications, curving an outer edge 26 of left and right side walls 18, 20 outward increases an amount of the spreading material retained inside work implement 12 (i.e., decreases an amount of material that spills over left and right side walls 18, 20). For this reason, outer edges 26 of left and right side walls 18, 20 may be generally convex.
Work implement 12 may be equipped with a shroud 28 that is located at each edge 26 to increase longevity of work implement 12. In particular, during engagement of work implement 12 with pile 22, edges 26 may come into abrasive contact with the material. Unless accounted for, this contact may cause premature wear of edges 26, thereby reducing the effectiveness of the convex shape and the life of work implement 12. Shrouds 28 may be replaceable, and configured to protect edges 26 from wear.
In some embodiments, a length of shroud 28 may be selected so that only a single shroud 28 may be coupled to each of left and right side walls 18, 20. Specifically, a length of shroud 28 may be selected to be just larger than one-half of a length of edge 26. In this way, a machine owner may be inhibited from installing two shrouds 28 in an end-to-end arrangement on each side wall 18, 20.
In general, wear along edge 26 may be greater near floor 14. Specifically, material engaged by work implement 12 may more often be positioned lower along edges 26 due to the effects of gravity and/or the difficulty of always fully loading work implement 12. For this reason, a lower end of shroud 28 may generally experience more wear than an upper end. Shroud 28 may be generally symmetric, relative to a lengthwise center (i.e., relative to a plane of symmetry 30), such that, after a period of wear, the shroud 28 originally mounted to left side wall 18 may be switched with the shroud 28 originally mounted to right side wall 20, thereby increasing a useful life of shrouds 28. In particular, at a time when the lower ends of shrouds 28 are worn out, the positions of shrouds 28 may be switched so that the upper ends thereof that are not nearly so worn may be moved to the lower positions that experience the higher rates of wear.
As shown in
Shroud 28 may be a single integral component fabricated through a casting process from an alloy material (e.g., from steel). Shroud 28 may have an elongated body 38 with a length L and consisting of spaced-apart first and second legs 40, 42 that are connected to each other at a vertex 44 to form a cross-section having a general V-shape. Body 38 may be arcuate, having a radius r of curvature substantially matching the radius of curvature of edge 26 (referring to
A mounting portion 48 may extend from first leg 40 inward relative to the curvature of body 38. Mounting portion 48 may be generally three-sided structure, with a raised back 50 and first and second ends 52, 54. A fillet 56 may be positioned at an inside corner between first leg 40 and each of first and second ends 52, 54 to increase a rigidity of mounting portion 48. Two tabs or projections 58, 60 may protrude inward from back 50 to engage base 34. In the disclosed embodiment, each of tabs 58, 60 have a dovetail cross section (i.e., a cross-section with opposing diverging side surfaces) such that tabs 58, 60 can be slid into corresponding notches 62, 64 of base 34. It is contemplated, however, that one or both of tabs 58, 60 could alternatively have a T-shaped cross-section or another cross-section, if desired. Tab 60 may be smaller and located closer to first leg 40 than tab 58, and tabs 58 and 60 may be generally aligned with each other and with plane 30 (referring to
The dimensions of shroud 28 may be selected to ensure adequate strength, security, durability, and longevity. For example, the radius of curvature and length of body 38 may be selected such that a ratio of these values (r/L) is about 2.75-3.0 (e.g., +/−10%). This ratio may provide for a desired engagement of a common shroud 28 with a range of different work implements 12 having different edge lengths and curvatures. In particular, a different curvature formed within a body 38 having a different length could decrease the engagement of shroud 28 with edge 26.
In another example, the height of protrusions 46 and the height of legs 40, 42, may be selected to allow for manufacturing variations of work implement 12 and to provide a desired breakout strength. In particular, h2 may be selected to be about 1/10th (e.g., +/−10%) of h1, and the thickness t may be about 2/3 (e.g., +/−10%) of the distance d1. These ratios may facilitate large tolerance stackups, while still providing adequate strength.
In yet another example, the distance d of protrusions 46 from the ends of body 38 may be about equal to 10% (e.g., +/−10%) of the length L. As described above, this relationship may facilitate the casting of shroud 28 while accounting for some warping.
Base 34 may be a three-sided lattice structure that is weldable to work implement 12 (i.e., to first and second side walls 18, 20). Specifically, base 34 may have first and second rails 70, 72 that extend in a length direction, and a plurality of crossbars 74 that bridge rails 70, 72 to form recess 68. A raised load pad 75 may be formed at each corner of base 34 to transfer loading from body 38 of shroud 28 to side walls 18, 20 of work implement 12 (referring to
Retainer 36 may embody a generally flat rectangular locking mechanism, for example a type of spring clip, Which is configured to compress during installation and decompress thereafter. For example, one end of retainer 36 may be inserted through window 66 into recess 68, and then force may be applied at an opposing end to cause retainer 36 to compress somewhat. Once retainer 36 has been compressed, the opposing end may be pushed through window 66 into recess 68 and released, thereby allowing retainer 36 to decompress and expand back to its free length. When retainer 36 is fitted inside recess 68, retainer 36 may not be removed without first using a pry bar to compress retainer 36. In this condition, retainer 36 may protrude out of recess 68 to mechanically interfere with tab 58, thereby inhibiting shroud 28 from being unintentionally slid out of engagement with base 34.
The disclosed shroud and shroud assembly may be applicable to various earth-working machines, such as wheel loaders, skidsteer loaders, excavators, front shovels, and draglines. Specifically, the disclosed shroud may be used to protect curved work implements of these machines against wear. Installation of shroud assembly 32 will now be described.
To connect shroud assembly 32 to work implement 12 for the first time, shroud 28 may first be connected to base 34. In particular, tabs 58 and 60 may be aligned with notches 62 and 64, respectively, and shroud 28 pushed toward base 34 until tabs 58, 60 are fully engaged. Retainer 36 may then be placed through window 66 of shroud 28 and engaged with base 34. This assembly may then be placed at a desired location on work implement 12, and base 34 may be tack-welded. The desired location of shroud 28 may include a lower end of shroud 28 located adjacent floor 14 (referring to
Once base 34 is tack-welded, retainer 36 may be removed, and shroud 28 slide out of engagement with base 34. Base 34 may then be hilly welded into position. Thereafter, shroud 28 may be slid back into engagement with base 34 and retainer 36 reinserted. By allowing some variability in the mounting location of shroud assembly 32 on work implement 12, different configurations, sizes, shapes, and conditions of work implement 12 may be accommodated.
After initial installation of shroud assembly 32 on a particular work implement 12, shrouds 28 may be more easily installed, replaced, and/or reoriented, as desired. For example, after a period of use, when the lower ends of shrouds 28 are worn beyond a threshold amount, retainer 36 may be removed and shrouds 28 slid out of engagement with bases 34. Shrouds 28 may then be inverted and reinstalled on opposite sides of work implement 12 from where they were removed. The same or new retainers 36 may then be reinstalled.
It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed shroud. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed shroud. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents.
This application is based on and claims priority to U.S. Provisional Application No. 62/088,171 filed on Dec. 5, 2014, the contents of which are expressly incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62088171 | Dec 2014 | US |
