WO2006100583A1

WO2006100583A1 - Wear part assembly

Info

Publication number: WO2006100583A1
Application number: PCT/IB2006/000670
Authority: WO
Inventors: Daniel Paul Silcock
Original assignee: Daniel Paul Silcock
Priority date: 2005-03-24
Filing date: 2006-03-24
Publication date: 2006-09-28

Abstract

A wear part assembly is provided which includes a wear part and lug over which the wear part is securable. The lug and wear part have apertures therethrough for receiving a bolt. The aperture through the lug is beveled at either end and accepts a complementarily tapered washer.

Description

WEAR PART ASSEMBLY

FIELD OF THE INVENTION

This invention relates to a wear part assembly, more particularly, but not exclusively, to a cleat assembly for use on refuse compaction equipment.

BACKGROUND TO THE INVENTION

Replaceable wear parts are widely used on equipment used for excavating, construction and the like. In refuse compacting equipment, rollers or wheels having replaceable cleats are often used to cause shearing and tearing of refuse material as well as compaction thereof. One such roller is described in PCT patent application number PCT/IB2003/03147. The wear parts are typically fitted to lugs using roll-pins or bolts which pass through aligned apertures in the lug and wear part. This arrangement is seldom satisfactory as it is necessary to have some degree of play between the wear part and the surface from which the lug extends in order to be able to align the apertures in the respective parts. This play results in relative movement of the wear part on the lug and in this turn leads to rapid wear of the wear part and also of the lug. This can also result in the pin or bolt shearing or breaking. In an attempt to avoid this happening roll-pins or double roll-pins are often used which provide such a tight fit as to be difficult to remove without a large degree of force. This often causes the pins to fly out at high velocity when eventually dislodged posing a serious threat of injury to bystanders.

As a result of these difficulties, operators often resort to simply cutting off wear parts and then welding further wear parts directly onto equipment. This is generally time consuming, inefficient and destructive of the equipment.

OBJECT OF THE INVENTION

It is an object of this invention to provide a wear part assembly which will at least partially alleviate some of the abovementioned problems.

SUMMARY OF THE INVENTION

According to this invention there is provided a wear part assembly which includes a wear part and lug over which the wear part is securable, the lug and wear part having apertures therethrough for receiving a bolt and wherein the aperture through the lug is beveled at either end and accepts a complementarily tapered washer.

Further features of the invention provide for each tapered washer to be of a metal, preferably a high tensile steel; for the bolt to accept a nut, preferably a Nyloc™ nut; and for the bolt and nut to be metal, preferably high tensile steel. Still further features of the invention provide for the wear part to be cast from a wear resistant material; and for the wear part assembly to form a cleat for a refuse compactor.

The invention also provides a lug for receiving a wear part substantially as defined above.

The invention further provides a method of securing a wear part to a lug wherein the wear part and lug have apertures therethrough for receiving a bolt, which method includes beveling the lug aperture at each end thereof, fitting the wear part over the lug, inserting tapered washers into the wear part aperture on either side of the lug, inserting a bolt through the washers, and fastening a nut to the bolt.

BRIEF DESCRIPTION OF THE DRAWINGS

One embodiment of the invention will be described, by way of example only, with reference to the accompanying drawings in which:

Figure 1 is a side elevation of one embodiment of a replaceable cleat assembly for a refuse compactor;

Figure 2 is a part sectional front view of the replaceable cleat assembly in Figure 1 ; and

Figure 3 is a perspective view of the replaceable cleat assembly in Figure 1.

DETAILED DESCRIPTION OF THE DRAWINGS

A replaceable wear part assembly (1) is shown in Figures 1 to 3. In this embodiment the wear part assembly (1 ) forms a cleat for a refuse compactor (not shown) wherein a plurality of cleats are arranged about the surface of a roller (not shown) to project radially therefrom.

Each cleat has two halves (3), each of which has an elongate rectangular shape and the ends (5) of which taper inwardly partway along the length thereof towards a flat top. The halves (3) are offset from each other such that their tops (7) are diagonally aligned. Each half has a base (10) with a wear part (12), in this embodiment a wear cap, at the free end thereof.

As shown more clearly in Inset A, each base (10) has a first end (14) which is firmly secured to the roller and a second end (15) which terminates in a central lug (17). The lugs (17) are rectangular with tapered ends and a central aperture (19) through the width thereof and which is beveled at each end (20).

As shown more clearly in Inset B, each wear cap (12) has a central socket (30) in the bottom (32) thereof which is complementary to the lug (17). An aperture (35) extends through the wear cap (12) near the bottom (32) and centrally transverse to the socket (30).

In use, with a wear cap (12) seated on a lug (17) the respective apertures (35, 19) are not completely coaxial, the axis of the wear cap aperture (35) being displaced slightly towards the free end of the lug (17). In this embodiment, the distance from the centre of the aperture (19) to the base (10) is 14mm while that of the aperture (35) to the bottom (32) of the wear cap (12) is 15,5mm. To align the axes and secure the wear cap (12) to the lug (17), tapered high tensile steel washers (40) are inserted into each end of the aperture (35). The taper on each washer (40) is complementary to that of the bevel on the aperture (19). However, the washers (40) do not seat properly in the beveled ends (20) as the apertures

(19, 35) are not co-axial as indicated above. A 10mm diameter bolt (42) is inserted through the washers (40) and a nut (44), preferably a Nyloc™ nut, fastened over the threaded end. Tightening of the nut (44) on the bolt (42) forces the washers (40) to seat fully in the beveled ends (20) of the aperture (19). This in turn causes the apertures (19, 35) to become co-axially aligned and has the effect that the wear cap (12) is drawn downwardly onto the second end (15) of the base (10). The result is that the wear cap (12) is positively located on the base (10) and is not able to move relative thereto. By the wear cap (12) being pulled down onto the base (10), the problems of rapid wear and bolt shear in prior art assemblies are eliminated.

Also, the tapered matching sections of the washers and beveled ends of the apertures incorporate locating lands (not shown) that minimize transmission of loads to the bolt. This avoids damage to the bolt and nut and also ensures that they can be easily unfastened. Furthermore, the positioning of the bolt and nut within the aperture in the wear cap prevents any impact damage occurring thus allowing for easy removal and replacement in a relatively short period of time using a socket spanner and a power drill or torque wrench.

The wear caps will be investment cast in a range of abrasive and impact resistant materials and to any desired level of hardness, including in steels normally used in the manufacture of rock drill bits. The bases can be manufactured from lower hardness material, including cheaper grades of weldable steel.

A simple yet highly effective wear part assembly is thus provided which not only prolongs the product life but also greatly improves operator safety.

Claims

1. A wear part assembly which includes a wear part and lug over which the wear part is securable, the lug and wear part having apertures therethrough for receiving a bolt and wherein the aperture through the lug is beveled at either end and accepts a complementarily tapered washer.

2. A wear part assembly as claimed in claim 1 wherein each tapered washer is made of a metal.

3. A wear part assembly as claimed in claim 2 wherein the metal is a high tensile steel.

4. A wear part assembly as claimed in any one of the preceding claims wherein the bolt accepts a nut.

5. A wear part assembly as claimed in claim 4 wherein the nut is a Nyloc™ nut.

6. A wear part assembly as claimed in claim 4 or claim 5 wherein the bolt and nut are made from a metal.

7. A wear part assembly as claimed in claim 6 wherein the metal is a high tensile steel.

8. A wear part assembly as claimed in any one of the preceding claims wherein the wear part is cast from a wear resistant material.

9. A wear part assembly as claimed in any one of the preceding claims wherein the wear part assembly forms a cleat for a refuse compactor.

10. A lug for receiving a wear part characterised in that it has an aperture therethrough for receiving a bolt and wherein the aperture is beveled at either end and accepts a complementarily tapered washer.

11. A method of securing a wear part to a lug wherein the wear part and lug have apertures therethrough for receiving a bolt, which method includes beveling the lug aperture at each end thereof, fitting the wear part over the lug, inserting tapered washers into the wear part aperture on either side of the lug, inserting a bolt through the washers, and fastening a nut to the bolt.

12. A wear part assembly substantially as herein described and as illustrated with reference to Figures 1 to 3.

13. A lug for receiving a wear part substantially as herein described and as illustrated with reference to Figure 2.

14. A method of securing a wear part to a lug substantially as herein described and as illustrated with reference to Figures 1 to 3.