# Patent

## Title
Fill and compaction roller using replaceable cleat assemblies with extended service life

## Abstract

A compaction roller for mounting on a driven compaction vehicle is equipped with both destructive and tractive, highly wear-resistant cleat assemblies. These include readily removable wear caps and supporting bases which have continuous side walls across the parting lines between the parts. Inset in the outer sidewalls are exposed mortise and tenon Jock joints serving to reduce relative movements between the parts under sever working forces. Pins extending radially between the wear caps and supporting bases further enhance the anti-twist resistance between the parts.

## Background
This application is a continuation-in-part of application Ser. No. 09/846,082, filed Apr. 30, 2001 now U.S. Pat. No. 6,682,262, which is a continuation-in-part of application Ser. No. 09/565,824, filed May 5, 2000, abandoned.


FIELD OF THE INVENTION
This invention generally concerns compaction machinery such as a roller or wheel for mounting upon a driven compactor vehicle or tractor, the roller having both destructive and tractive characteristics adapted to break up, crush, grind and compact throwaway materials commonly delivered to a sanitary land fill operations. More particularly this invention is characterized by cleat assemblies including removable wear caps configured for a long service life.
BACKGROUND OF THE INVENTION
Compaction rollers and wheels used on landfill operations and particularly sanitary landfill operations are equipped generally with cleats or feet of the type for grinding and crushing materials to reduce the size and bulk of the material. As shown in the assignee's prior patents, U.S. Pat. Nos. 3,922,106 and 4,919,566, an earth and sanitary fill compaction roller has been shown employing two different types of feet having a replaceable wear cap as a part of the cleat assemblies. The wear caps are welded to a base portion of the assembly, which in turn is welded to the roller as shown in U.S. Pat. No. 3,922,106. The wear caps in U.S. Pat. No. 4,919,566 are readily removable from the base portion of the assembly using common tools available at the job site. It has been observed that due in large degree to manufacturing tolerances that the use of removable wear caps coupled to a fixed base, in severe service exposes the assembly to twisting forces which in time materially reduce the service life of the wear cap and cleat assembly. In the '566 patent, a cleat assembly was disclosed including means for restraining twisting of the wear cap relative to the base, which function entirely satisfactory with compaction equipment then operating in the 70,000 lbs. gross weight class. Improvements in the cleat assembly are desired for use on compaction rollers mounted on compaction machines now furnished in the 100,000 to 120,000 lbs gross vehicular weight class.
More particularly, the compaction vehicles of the higher operating weights now coming into service apply substantially more torque to the compaction rollers via their larger engines and transmissions than was the case with compactors that were 30,000 to 50,000 lbs. lighter in gross vehicle weight. Moreover, landfill operators expect very long service life of the compaction rollers and cleat assemblies, some required assurances that these components will render a service life on the order of 20,000 hours. Thus, it is highly desirable to accommodate in the cleat assemblies on the compaction rollers the higher torque than tractive forces applied by the extra heavy duty compaction machinery now entering into service.
SUMMARY OF THE INVENTION AND OBJECTS
In general, an improved compaction roller carries cleat assemblies comprising a rigid mounting pad assembly to be welded to a rigid cylindrical body and a bracket integral to the base portion protruding generally outwardly therefrom. At least one coupling opening extends transversely through the bracket. A detachable wear cap unit is releaseably coupled to the base, the cap having a generally hollow body, including radially outwardly converging outer sidewalls and having broad tractive faces with enlarged end portions. At least one pair of aligned openings is formed through the sidewalls and align able with the coupling openings for receiving coupling means there through. Coupling means are disposed acting between the bracket and the wear cap unit. The cleat assembly being characterized by means restraining twisting of the wear cap unit with respect to said base portion, and including a plurality of apertures and complementary projections such as mortise and tenon-like elements arranged on said base portion and said wear cap unit and positioned outwardly on said base portion on said bracket. The wear cap including transverse end walls extending between the end portions of said side walls and merging therewith into enlarged corner portions protruding outwardly for substantially their full height from the general plane of the sidewalls thereby defining a broad tractive working face.
In general it is an object of the present. invention to provide an improved fill and compaction roller having readily replaceable cleat assemblies compatible with extra heavy duty compaction equipment utilizing high horsepower and torque forces.
It is another object of the present invention to provide an improved cleat assembly in which the wear cap can be readily replaced so as to avoid the wearing away the mounting base carrying such wear cap.
Another object of the invention is to provide a cleat assembly of the type described having broad tractive working faces.
It is a further object of the invention to provide an improved cleat assembly for fill and compaction roller characterized by means restraining twisting between the wear cap and base.
It is yet an additional object of the invention to provide a cleat assembly for a fill and compaction roller including readily removable cap units or shoes serving to provide to the roller traction and demolition functions.
An additional object of the invention is to provide a cleat assembly having a readily removable cap unit serving to engage upon a base in secure mortise and tenon joints thereby inhibiting twisting of the cap unit with respect to the base.
The foregoing and other objects of the invention will become more readily evident from the following detailed description of preferred embodiments when considered in conjunction with the drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the rear of a sanitary landfill trash compactor equipped with compaction rollers having mounted thereon the cleat assemblies, all made in accordance with the principles of the present invention;
FIG. 2 is a perspective view on an enlarged scale of a contour type wear cap having broad tractive working end faces;
FIG. 3 is a view on the scale of FIG. 2 showing the contour cleat base;
FIG. 4 is a plan view from above of the contour cleat shown in FIGS. 2 and 3;
FIG. 5 is an enlarged perspective view, like FIG. 2, showing the wear cap of a traction foot of the present invention having broad tractive working faces;
FIG. 6 is a perspective view of the adapter base accommodating the wear cap of FIG. 5;
FIG. 7 is a plan view from above of the traction cleat shown in FIGS. 5 and 6;
FIG. 8 is a perspective exploded view of the contour cap base assembly equipped with anti-twist pintles;
FIG. 9 is a perspective view from above of the adaptor base as shown in FIG. 8;
FIG. 10 is an exploded perspective view of the traction foot of the present invention equipped with the pintle anti-twist elements;
FIG. 11 is an enlarged perspective view from above of the adaptor base for the traction foot as shown in FIG. 10;
FIGS. 12 and 13 are perspective views of still another embodiment of the invention showing dowels and recesses on the base adaptor and wear cap, respectively, for anti-twist purposes;
FIGS. 14 and 15 show yet another embodiment of the invention with recesses on the base adaptor and protruding elements on the wear cap for anti-twist purposes;
FIG. 16 is an exploded perspective view of the wear cap and adaptor for the contour foot showing another preferred embodiment of the anti-twist provisions;
FIG. 17 is an enlarged perspective view from above of the adaptor base shown in FIG. 16;
FIG. 18 is a perspective exploded view of the traction foot assembly showing another preferred embodiment of the anti-twist means in the environment of a traction foot;
FIG. 19 is an enlarged perspective view from above of the adaptor base of the embodiment shown in FIG. 18;
FIG. 20 is an exploded lavational view of a contour foot showing insertable pins or dowels serving as anti-twist means;
FIG. 21 is a view like FIG. 20 but showing still another form of traction cleat of the present invention;
FIG. 22 is a view like FIG. 10 but rotated to view from below, an exploded perspective view, of the traction foot of the present invention equipped with the mortise and tenon lock, each lock being equipped with a pintle;
FIG. 23 is an exploded perspective view of the contour foot equipped with the mortise and tenon lock and with pintle anti-twist elements;
FIG. 24 is a view like FIG. 23 showing a wear cap configuration employed in bio-mass landfill applications.



DESCRIPTION OF THE PREFERRED FORMS OF THE INVENTION
A compaction roller 10 constructed according to the present invention is illustrated in FIG. 1 mounted upon a power-driven trash compaction vehicle 11 of high gross vehicular weight, the roller 10 normally being deployed in sets of four as shown. The compaction roller 10 includes a rigid cylindrical body or rim 12 connected to a centrally disposed conical web 13 which in turn is rigidly secured to central wheels structure 14 shown diagrammatically but may be constructed according to U.S. Pat. No. 3,724,342 assigned to Caron Compactor Company to incorporate cushioning elements and the like.
The wheel or roller 10 is shown mounted upon a very heavy duty compactor. vehicle, one in the gross vehicle weight range of 70,000–120,000 lbs. The high vehicular weights are desirable to achieve high compaction densities in the sanitary land fill thereby to increase the capacity life of the landfill.
The cylindrical rim 12 of each of the four wheels shown in FIG. 1 is equipped with cleat assemblies 16–17 as described more fully below which are arranged in rows as shown. For ease of reference the cleat assemblies 16 referred to as traction cleats being that the cleat are provided with broad flat faces presented to the direction of wheel rotation. The cleat assemblies 17 may be referred to as contour cleats being that they are oriented on the rim 12 with the long dimension of the cleat assembly extending in the direction of travel and their configuration follows the contour of the wheel rim. Both the contour cleats 17 and the traction cleats 16 have broad faces oriented in the direction of travel, and thus, both provide substantial traction effect for the wheel or if viewed in another way, the driving force applied by the transmission and a motor of the compactor are distributed onto both the traction and contour cleats which together serve to crush and grind materials normally deposited in a landfill.
As shown in FIGS. 2 and 3, the contour cleat assembly 17 includes a rigid mounting pad unit 18 having a base portion 19 curved to conform to the curvature of cylindrical rim 12 so as to be welded to the rigid body formed by the rim. It will be understood that the metallurgical composition of the cast steel mounting pad 18 is such as to facilitate welding to the steel rim. On the other hand, the metallurgical composition of the cast steel wear cap 21 is substantially harder and cast from a steel formulation selected to resist abrasion over a long service life. This material is not conducive to welding and for this reason, a mechanical connection is highly desirably so that a very hard wear cap may be coupled to a relatively softer, readily weldable, supporting base 18. Serving to maintain the wear cap 21 releaseably secured to the mounting pad 18, faster means including a pin 22 and a coil spring member 23 are mountable in the associated apertures 24 and 26, respectively, as taught in the assignee's U.S. Pat. No. 4,919,566, FIGS. 26–33. Although but a single pin 21 and capture spring 23 are shown in FIGS. 2 and 3, it is apparent that a pair may be usefully received in the contour cleat 17 to promote a good fit between the parts. It will be seen that the central bracket 25 is cast integral with the base portion 19 and protrudes generally radially outwardly therefrom.
The wear cap unit 21 has a generally hollow body including sloping upwardly converging outer side walls 27 and end walls 28 which at the edges bulge outwardly so that the end walls 28 taper from a narrow portion adjacent the base mounting pad 19 to a wider top end portion 29 as shown in FIG. 4. This configuration presents broad traction faces 28 to the contour cleat 17 and further provides bulbous metal masses along the end faces 28 to resist abrasion and wear over the desired along service life of the wear cap. The top wall 29 of the wear cap 21 is thus configured to have its narrowest dimension near the cleat center portion with the widest dimensions near the juncture with the end walls 28 providing substantial masses of steel in an ideal position to resist abrasive wear.
Referring now specifically to FIGS. 5, 6 and 7, the traction cleat 16 includes a wear cap 31 and a rigid mounting pad unit 32 having a base portion 33 curved to conform to the curvature of the cylindrical rim 12 to as to be welded to the rigid body formed by the rim. The metallurgical composition of the wear cap 31 and adaptor base 32 is the same as that referred to in connection with the corresponding component parts of the contour cleat 17. The pad 33 includes integrally formed bracket 35 which extends generally outwardly from the pad 33 and is mounted generally centrally of the pad. At its edges the pad is recessed as indicated at 34 along two parallel sides so as to receive skirt-like extensions 35 of the side wall of the wear cap to thus protect the mounting pad unit 32. A plurality of anti-twist gussets 36, triangular in shape are formed between the pad 33 and central bracket 32, three being indicated on each side of the bracket. Complimentary gusset receiving recesses 37, 38 are formed in the wear cap 31 so as to enclose the gussets 36 in a snug fit. A central recess 40 is configured to receive the central bracket 35.
The wear cap 31 includes sloping, upwardly converging side walls 39, 42 and end walls 41. The end walls 41 converge with the side walls 39, 42 in enlarged outwardly protruding, bulbous corner portions 44 and thus the top wall 43 has its broadest portions arranged adjacent the end walls 41 and the narrower portion centrally located. This configuration preserves the desired tractive effect of the cleat 16 while permitting a long service life by positioning substantial metal masses at the four corners of the wear cap which has been found in use to abrade more rapidly than the central portions of the wear cap. It will be apparent that the complimentary recesses and anti-twist elements 36 between the wear cap and adaptor provide for a snug and highly twist-resistant fit being that the elements 36 that are disposed adjacent to the end portions of the bracket 32.
Fastener means 22, and 23 as shown are provided to releaseably secure the adaptor base to the wear cap in the manner already described.
Referring to FIG. 8, another embodiment of contour cleat 47 is shown and for the reason that it comprises elements previously described, the same reference numbers will be used but with the prime symbol. As shown, the contour cleat assembly 47 includes the rigid mounting pad 18′ having a base portion 19′ and a central bracket 25′ cast integral with the base portion to protrude generally radially outwardly therefrom.
The contour cleat 47 includes the wear cap unit 21′ configured as previously described and is provided with apertures 24′ to receive the holding pin 22′ whereas the adaptor base 18′ is provided with the aperture 26′ to receive the coil retaining spring 23′. A plurality of anti-twist elements having a general configuration of tapered billets are positioned on the base 19′ two on each side of the central bracket 25′. The billets or pintles 48 may be tapered upwardly as shown in FIGS. 8 and 9 or may be substantially cylindrical and of uniform diameter according to foundry practice. Their height may be on the order of 3⁄4′′ to 11⁄2′′ in length. Although four anti-twist billets 48 are illustrated, this number may be varied so that two billets will be positioned on one side of the bracket 25′ and but a single billet on the opposite side. Further, it is practical to use two billets 48 with one positioned on either side of the bracket 25′ or both on the same side of the bracket 25′.
Complementing the billets or pintles 48 the wear cap 21′ is equipped with receiving cavities configured to fit closely with the billet elements 48. Thus, when the wear cap 21′ is mounted on the adaptor 18′ the billets 48 are received in their complementary recesses and the coupling elements 22, 23 connected thereto serve to unite the parts together in a tight relationship resisting twisting of the wear cap 21′ with respect to the adaptor 18′.
Referring now specifically to FIGS. 10 and 11, another preferred form of traction cleat 46 is illustrated and includes parts previously described, thus designated with the reference numerals primed. The traction cleat 46 includes a wear cap 31′ and a rigid mounting pad unit 32′ having a base portion 33′ for welding to the wheel rim. The pad 33′ includes the integrally formed central bracket 35′ which extends generally outwardly from the pad 33′ as shown. At its edges the pad is recessed as indicated at 34′ to receive skirt-like extensions 35′ of the sidewalls 39′, 42′. A plurality of anti-twist billets or pintles 48 are formed on the pad 33′ and project generally upwardly on both sides of the central bracket 35′. Complementary shaped recesses are formed in the wear cap 31′ so as to receive the billets or pintles 48 therein. A central recesses 37′ is provided for receiving the gusset antitwist elements 36′. On the traction cleat 46, the billet elements 48 are indicated as being deployed in pairs on either side of the central bracket, but it is practical to achieve substantially the same anti-twist effect by using three integral elements and as the application dictates or two elements, one each side of a central bracket. The wear cap is provided with apertures or recesses for receiving the pintle elements.
Still another preferred form of the traction cleat 56 is shown in FIGS. 12 and 13. As was the practice above, similar parts have been designated with similar reference numerals accompanied by a prime symbol. Similar parts previously described and contained in the traction cleat 56 include the wear cap 31′, mounting pad unit 32′, base portion 33′, central bracket 35′, recesses 34′, wall extensions 35′, and sidewalls 39′ and 42′. The recesses 30′ and 40′ are also present in the wear cap 56. A plurality of anti-twist stub posts or bosses 57 and complementary recesses 58 are disposed respectively on the adaptor pad 33′ and in the under side of the wear cap 41′. It will be apparent that the complementary recesses and anti-twist elements 58 and 57 when fitted together interact to permit the wear cap 31′ and adaptor base 33′ to achieve a highly twist-resistant fit between the elements. Faster means (not shown) are provided as in the instance of the embodiments illustrated in FIGS. 5, 6, and 10 to releaseably secure the adaptor base to the wear cap in the manner already described. Although four anti-twist stub posts or bosses 57 are illustrated together with the associated recesses 58, this number may be varied so that either 3 or 2 stub posts may be disposed on the adaptor pad 33′ as the need dictates. It is to be understood that the receiving cavities 58 and the wear cap are configured to fit closely with the stub post or boss elements 57 so that the parts may unite in a tight relationship resisting twisting of the wear cap with respect to the adaptor 33′. The stub post or boss 57 configuration with the associated recesses 58 can be applied to the contour cleat, e.g., applied to the embodiment shown in FIGS. 8 and 9. In that instance the stub post 57 would exist in place of the billets or pintles 48 and their associated recesses.
Referring now specifically to FIGS. 14 and 15, yet another preferred form of traction cleat 66 is disclosed. Parts previously described above are enumerated in FIGS. 14 and 15 with the reference numerals primed, as practiced above. These will not be further described. A plurality of anti-twist wedges 67 are formed on the wear cap 31′, the wedges 67 being disposed on the undersurface so as to project outwardly therefrom. Triangular recesses 68 are disposed in the pad surface 33′ to receive the wedge elements. When the wear cap 31′ is drawn tightly into the adaptor pad 32′, the wedge protrusion 67 seat snugly within the recesses 68 to provide for the substantial anti-twist resistance within the two piece cleat unit 66. Although an exemplary four anti-twist elements are illustrated, actual practice may dictate few than four will serve satisfactory the desired purposes.
Referring to FIGS. 16 and 17, another embodiment of contour cleat 77 is shown and for the reason that it comprises elements previously described, the same reference numbers will be used with the prime symbol. A plurality of anti-twist elements 79 having a general configuration of a greatly enlarged saw tooth are positioned on the central outer edge of the mounting base or pad 19′ and correspondingly on the lower portion 79 of the walls 27′ of the wear cap 21′. Whereas when formed integrally with the pad 19′, the saw tooth antitwist element 78 protrude upwardly and are shown as comprising four projections. On the wear cap 21′, the bottom or skirt portions of the sidewalls 27′ are recessed so as to receive the four projections from the adaptor pad 19′. It will be apparent that when the wear cap and adaptor pad are drawn together, the saw tooth elements 78,79 interfit and provide the desired highly twist-resistant interconnection between the parts.
Referring now to FIGS. 18 and 19, still another preferred form of traction cleat 86 is disclosed. Parts previously described above are enumerated in FIGS. 18 and 19 with reference numerals prime, as practiced above. These will not be further described. A plurality of anti-twist, enlarged saw tooth like elements 87 and 88 are arranged on the wear cap 31′ and the adaptor base 32′. The anti-twist, saw tooth like elements 87, 88 are provided respectively on the sidewalls of the pad 33′ and the enwalls 41′ of the wear cap 31′. As mounted on the compaction roller 10 the saw teeth are disposed or aligned in the direction of rotation or are aligned in the direction of rotation. When the wear cap 31′ and base 32′ of unit 86 are pulled together, the tooth-like elements fit into mutual complementary recesses. Fastener means as mentioned above are received within the apertures 26′ and thus enable the parts to nest tightly together for resisting twisting forces applied between the wear cap 31′ and base 32′ of the cleat 86.
Referring now specifically to FIG. 20, another preferred form of contour cleat 97 is shown and comprises elements previously described as signified by reference numerals carrying primes. On the cleat 97 there is provided a plurality of anti-twist elements 98, each having a general configuration of a cylindrical pintle and a complimentary recess 99. These are arranged such that the recesses 99 are provided both in the base 19′ of the mounting pad 18′ as well as in the bottom surface of the wear cap 21′, as shown. The pintle elements 98 during cleat assembly are positioned in the holes or apertures 99 and extend above the upper surface of the pad 19′ so as to project into corresponding apertures or holes 99 within the wear cap. One of the advantages of this configuration is that in the foundry casting process it is necessary only to cast the recesses 99 in the two cleat parts. The pintle elements 98 may be cut from cylindrical or other shape bar stock to the desired lengths on the order 3⁄4′′ to 13⁄4′′. The length is selected so that the parts of the wear cap base and pintle 98 will all nest securely together for resisting twisting actions imparted to the wear cap and adaptor. Although two anti-twist elements are illustrated in FIG. 20, as the need dictates, three or four such elements may be provided simply by the addition of more complimentary, in registration recesses in the pad 18′ and wear cap 21′ of the contour cleat 97.
The pintle element 98, as an alternative to being formed from steel bar stock, may be a fabricated “flex-pin” wherein two curved metal side portions define a sandwich with a compressible somewhat elastic central member. The flex-pins when driven into the apertures 99 compress the elastic central portion, and thus establish a snug fit within the aperture 99.
On the other hand, it has been found advantageous to employ cylindrical slugs 98 which are somewhat smaller in diameter than the inside diameter of the aperture so as to accommodate easily the tolerances in general foundry casting practice. This is especially useful when two or more slug elements 98 are employed and the foundry general casting tolerance accommodates the dimensional allowance furnished by the undersized slugs or pins 98. Although it is indicated in FIGS. 20 and 21 that the anti twist means are arranged to straddle the medial axis of the traction cleats 97, 106, it is appropriate in some applications to locate the anti twist element substantially on the medial axis, especially with regard to the cleat element 97.
Referring to FIG. 21, another preferred form of traction cleat 106 is illustrated and includes parts previously described, thus designated with reference numerals primed. The traction cleat 106 includes a wear cap 31′ and a rigid mounting pad unit 32′ having a base portion 31′ for welding to the wheel rim 12. A plurality of recesses 99 are formed in registry in both the cap 31′ and adaptor base 32′, as shown. These serve with the pintle or slug elements 98 as anti-twist means. The “flex-pins” are useful in this application as described above. The wear cap 106 is adapted to receive the connection means 22, 23 (not shown), and thus when the pins or slugs 98 are positioned in the holes or recesses 99, the wear cap 31′ and adaptor 32′ can be assembled in a tight fit resisting twisting forces applied to the wear cap and adaptor of the traction cleat 106 in severe usage over a long service life.
It will be further understood that in use of the compaction cleats 97, 106, normally in a sanitary land fill site, fine materials usually migrate into the interior of the cleat and wear-cap assembly such that although the pintle or slug 98 and recess 99 may initially be somewhat of a loose fit in a very short period of operational time, the interstices accumulate these fine materials which come to act as a cement uniting the pintles or pins in the recesses in both the wear cap and base. This furnishes a rigid connection. As is apparent, the antitwist means when the cleat assembly is in use are concealed. Disassembly of the two part unit exposes the pintles for removal if necessary. A strong blow with a sledge hammer or the like will loosen the part sufficiently for removal or replacement.
Referring to FIG. 22, another preferred form of traction cleat 110 is illustrated and includes parts previously described, thus are designated with reference numerals primed or in certain instances double primed. The traction cleat 110 includes a wear cap 31′′ and a rigid mounting pad unit or adaptor 32′′ having a base portion for welding to the wheel rim 12 (not shown but previously described). To protect the attachment weld from abrading during the service life of the cleat 110 an undercut or bevel 115 is disposed on the longer sides of the base or adaptor 32′′ as seen in the view from below of FIG. 22. When the adaptor 32′′ is welded to the wheel rim along the bevel 115 the attachment weld is protected. Furthermore, the wear cap 31′′ is configured with depending skirts 117 at the lower margins of the walls 110 and these skirts 117 overlie substantially the attachment welds when the parts are assembled for working use. The end walls 111 of the traction cleat 110 are substantially enlarged curves bulging outwardly into a rotund and bulbous configuration for substantially their full height. This configuration provides an arrangement of substantial masses of metal for both strength, weight and wear purposes. The traction faces 112 of the wear cap 31′ merge into the end walls 111 at enlarged corner bulbous portions extending the full height of the wear cap, thus enhancing the mass and weight of the wear cap. The two apertures 24′ which extend through the side walls 112 and are adapted to receive the pins 22′ and retainer springs 23′ are at each side wall furnished with counter bores 109 so that the pins 22′ may penetrate the cleat assembly and reside in a recessed position beyond the bevel or counter bore 109. This configuration shields the pin ends from being abraded from long service and to preserve the pin ends in their original squared off condition for easier removal when changing wear caps 31′′.
At its lower periphery, as clearly shown in FIG. 22, the wear cap 31′ in each end wall 111 is provided with a generally rectilinear shaped recess or mortise 113a which complements an upstanding, generally rectilinear tenon 113b on each end of the base 32′′. Thus it will be understood that mortise and tenon lock joint 113a, b is present on each end wall 111 of the traction cleat 110. The base or pad 32′′, is equipped with a substantial thickness of metal to the effect that its upper surfaces extend a substantial vertical distance from the wheel rim (not shown). Thus the tenon element 113b is elevated above the wheel rim.
Complementing the mortise and tenon lock configuration 113a, b is the pintle and hole arrangement extending into the mortise and tenon joint, pintle 98′, hole 99′. The mortise and tenon lock act together with the pintle 98′ and the associated recess 99′ to insure a rigid, torque resistive interconnection between the wear cap and adapter. This configuration serves to resist and oppose the high traction and twisting forces imparted to the traction cleats by the high horsepower compaction equipment used on sanitary landfill sites today.
Referring to FIG. 23, another preferred form of contour cleat 116 is illustrated and includes parts previously described, thus being designated with reference numerals primed. The contour cleat 116 includes the wear cap unit 21′ and supportive adaptor base 19′ which are configured to interconnect together with a mortise and tenon lock arrangement 117a , b on opposite side walls. In this instance the generally rectilinear mortises or recesses 117a are arranged along a medial portion of opposite sides of the base 19′. The generally rectilinear tenon elements 118b project downwardly from the opposite sides of the wear cap 21′ and constitute its lower extremities. A plurality of holes or recesses 99′ are formed in a registry relationship within both the wear cap 21′ and the base 19′. Although the holes 99′ in the wear cap 21′ are not visible in FIG. 23, it will be understood that they are present to effect the locking interaction with the pintles or slugs 98′′. Thus, the pintles or billets 98′′ are adapted for reception into the holes 99′ and interact together to secure the wear cap 21′ from twisting forces with respect to the base 19′. This feature is further enhanced by the lock supplied by the mortise 117a and tenon 117b elements.
As may be perceived from FIG. 23, it will be understood that the wear cap 21′ has a generally hollow body including sloping, upwardly converging sidewalls 27′′ and end walls 28′′. The upwardly sloping converging sidewalls 27′′ and end walls 28′′ merge along edges portions that bulge outwardly over substantially the entire height of the wear cap, as illustrated in FIG. 23. This provides a substantial mass of material for enhancement of both strength, wear and weight of the contour cleat 116. This provides steel in optimum locations to resist abrasive wear and to establish an ideal joint between the wear cap and adaptor that will resist twisting and torsion from the powerful modern compactors employed today at sanitary landfill sites. Shielding the two apertures 24′ for the retainer springs 23′ and and protecting the ends of the pins 22′ on each side wall 27′ there is provided a ledge of metal 119. This configuration protects the ends of the pins 22′ and maintains them in a substantially unabraided condition for the time for their removal so as to furnish a planar face for engagement by the removal tools. Moreover at a time after a long service life, the wear cap may be dismounted from the adaptor with the use of common tools available to workmen in the field.
Referring to FIG. 24, another preferred form of traction cleat 121 is illustrated and includes parts previously described, designated with reference numerals primed or double primed. The cleat 121 is especially adapted for work on bio-mass applications at sanitary landfills and provided with a cross-like configuration at its working tip face. The action of this cleat serves to induce improved penetration of air into the landfill materials to encourage good bacterial action analogous to fermentation within the landfill materials. The bio-mass cleat 121 resembles generally the contour cleat 116 and includes a generally similar adapter base. The cleat 121 is equipped with the mortise and tenon lock arrangement including the recess 117 in the base and the tenon 118′ in the sidewalls of the wear cap. The pins 98′ and holes 99′ are provided for the anti-twist locational functions mentioned above. The sidewalls 122 are each further equipped with a vertically extending spur 123 which extends vertically over one half of the length or height of the wear cap. The spurs on each side acting with the top or tip working face and the ends of the sidewalls provide the cross-configuration for enhanced punching action into the landfill bio-mass applications.
From the foregoing, it will be readily evident that there have been provided improved cleat assemblies for fill and compaction rollers whereby the wear cap and associated adaptors have a long service life being that the wear caps are equipped with bulbous metal portions protruding from their plane surfaces for presenting metal in optimum locations to achieve a long wear life, as much as 20,000 useful working wear life. It will be further evident that anti-twist means are provided acting between the wear cap and adaptor to resist twisting moments there between. This further enhances the extends the service life of the cleats by substantially reducing the “working” or vibration between the wear caps and the adaptors which wears down the softer steel adapters from rubbing against the harder steel wear caps.
The embodiments disclosed herein where chosen to best explain and describe the principles of the invention and its practical application to thereby enable any others skilled in the art to best utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto.

## Claims

1. A very heavy duty replaceable wear cap assembly for mounting on a compaction roller configured for operation on a landfill compactor having a gross vehicle weight in the 70,000 to 120,000 pounds range, said roller having a cylindrical rim adapted for mounting and rotation upon an axle of said compactor, each heavy duty assembly comprising
a base mounting pad configured from cast steel in a mass to achieve a 20,000 hour service life and including perimeter edge portions serving to receive weld metal to secure said mounting pad fixedly upon said cylindrical rim and
a wear cap configured from cast steel and mounted upon said base mounting pad in a tight fit,
said wear cap having fore and aft compaction faces configured when mounted on said mounting pad to be oriented in the direction of the compaction roller's rotation on the axle,
said base mounting pad and said wear cap including substantially continuous exterior side walls disposed generally normal to the axle and the compaction faces, tightly engaged, exposed mortise and tenon lock joints in said exterior side walls configured so that the exposed tenon extends between said wear cap and said mounting pad in a tight fit connection that resists torsion forces acting on said assembly and resists twisting and rocking forces, and
a spaced apart pair of fastener assembly means extending completely through the wear cap and mounting pad serving to fixedly secure together said wear cap and mounting pad,
the engaged fit between the assembled wear cap and mounting pad being designed to be very tight such that the fit precludes, during said long service life, relative twisting and rocking movements between the wear cap and mounting pad, the fastener assembly means permitting later dismounting of the wear cap from the base mounting pad.

2. The replaceable wear cap assembly of claim 1 wherein the mortise and tenon lock joints are configured in the sidewalls with the tenon elements projecting downwardly from the wear cap and the mortises comprise complementary recesses in the base mounting pad.

3. The replaceable wear cap assembly of claim 1 wherein the mortise and tenon lock joints are configured in the sidewalls with the tenon elements projecting upwardly from the base mounting pad and the mortises comprise complementary recesses in the wear cap.

4. The roller replaceable wear cap assembly of claim 1 wherein each mortise and tenon lock joint includes aligned cylindrical recesses and complementary concealed cylindrical slug means fitted within the recesses and extending from the recess in the mounting pad into the recess in the wear cap.

5. The replaceable wear cap assembly of claim 1 wherein the mortise and tenon lock joint elements are formed in a substantially rectangular configuration.