GB1604100A

GB1604100A - Mineral cutter pick arrangement

Info

Publication number: GB1604100A
Application number: GB23129/78A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-05-26
Filing date: 1978-05-26
Publication date: 1981-12-02
Also published as: AU4737579A; FR2434924B2; ZA792505B; DE2921240A1; JPS54158303A; PL215858A3; ES243572U; ES243572Y; FR2434924A2

Description

(54) MINERAL CUTTER PICK ARRANGEMENT (71) I, SIDNEY ERNEST PROCTOR, a British Subject of Orchard End, Shortway, Amersham, Buckinghamshire HP6 6AQ, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to arrangements of mineral cutter picks, more particularly the invention is concerned with improvements in or modifications to the cutter pick arrangements described in my copending Patent Application No. 30908/76. Serial no 1590825 Known arrangements of mineral cutter picks, for example coal cutter picks, generally provide a cutter pick located in a pick block, for example a cutter chain link, shearer drum or pin-on block.These known arrangements are costly to produce and, moreover, are difficult and expensive to replace.

In Patent Application No. 30908/76 Serial no 1590825 there is described a mineral cutter pick arrangement comprising a cutter pick holder having an elongated leading surface and an upper surface, and a mineral cutter pick comprising a body member with a leading edge and a rear surface, wherein the body member is formed with a cutter tip at one end of said leading edge and with a top member extending rearwardly of said rear surface, the bottom surface of said top member and the upper surface of said holder being provided with interengaging means enabling the pick to be located on the holder with the rear surface of the pick in abutment with the leading surface of the holder.

According to an aspect of the present invention there is provided a cutter pick holder having an elongated leading surface and an upper surface and a mineral cutter pick comprising a body member with a leading edge and a rear surface, wherein the body member is formed with a cutter tip at one end of said leading edge and with a top member extending rearwardly of said rear surface, the bottom surface of said top member and the upper surface of said holder being provided with interengaging means enabling the pick to be located on the holder, wherein the widest dimension of the cutter pick transverse to the forward direction of movement of the cutter pick adjacent the cutter tip is greater than the corresponding dimension of the cutter pick holder, and wherein the rearmost surface of the top member of the cutter pick extends from the under-surface of said top member at an angle which diverges from the normal to the undersurface of the said top member which rearmost surface bears, in use, against a surface of the pick holder which conforms to said rearmost surface.

Embodiments of the invention will now be described with reference to the accompanying drawings in which: Figure 1 is a side view of a coal cutter pick arrangement embodying the present invention; Figure 2 is a sectional side elevation of the arrangement of Figure 1; and Figure 3 is a sectional view drawn on the lines III--III of Figure 1; Figure 4 is a partial plan view of the arrangement of Figure 1.

Figure 5 is a sectional side elevation of another arrangement embodying the invention.

With reference to the Figures, it will be seen that a coal cutter pick arrangement includes a body member 20, formed integrally with a top member 21 which extends rearwardly therefrom.

The uppermost end of the leading edge of the cutter pick is provided with a cutter tip 22 which may be of tungsten carbide or other suitable hard metal deposit. This tip is preferably brazed or welded into a recess formed into the leading uppermost portion of the cutter pick.

Various modifications may be made to the arrangement of cutter pick. The uppermost portion of the cutter pick may be formed as a separate unit welded directly on to the top of the body member 20. The cutter tip 22 may be welded or brazed into position on the top of the cutter pick. The cutter tip 22 may be formed as a single unit with the top member and fixed with the top member into position on the top of the cutter body.

The lowermost surface 23 of the-top member 21 is formed with a cylindrical bar 25 which, when the pick is in position on a holder 26, extends into a hole 27 formed therein. The bar 25 is preferably circular in cross-section, although the other shapes, in cross-section, may be used. The bar is provided with a cut-out as shown formed by a first surface 28 extending generally normally of the axis of the bar and the second surface 29 which slopes from the innermost end of the surface 28 to the rearmost surface of the bar.

The bottom end of bar 25 is cut away shown at 30.

A recess 31 in the pick holder carries a neoprene or other elastomeric material, plug 32 which is formed on a steel pin 33 as shown. Plug 32 just into the aperture 27 and; in use, extends into the cut-out formed by the surfaces of 28 and 29 in the bar 25.

The rearmost surface 34 of the top member 21 is angled, by preferably 10 to the normal extending from the lowermost surface 23 as shown and, bears, in use, against a surface 35 of the pick holder which conforms to it.

The leading edge 37 of the pick holder 26 is shaped to conform to the arcuate surface.rrt the rear of body member 20.

The rearmost surface 34 of the top member 21 is provided with a land 37a which is received in a slot 38 formed in surface 35. It will be appreciated that the arrangement of land 37a in slot 38 prevents movement of the pick relative to the pick holder in a direction transverse to the direction movement of the pick in use.

To locate the cutter pick on a pick holder the bar 25 is located in the upper part of hole 27 and the pick pushed onto the pick holder.

The arcuate rear surface of the body member 20 aligns itself with the conforming leading edge 37 of the holder 26 and the bar 25 slides down the hole 27 until its bottom end reaches the plug 31. The cutter pick may then be hammered down such that the neoprene plug 31 is pushed aside, passing up surface 30 and along the side of the bar 25 until it enters the cut-out formed by the surfaces 28 and 29.

Desirably the bar 25 extends below the top member by an amount which is equal to or more than the amount by which the body member extends below the top member. At the same time the rearmost surface of 34 of the top member 21 is forced into engagement with the surface of 35 of the pick holder, the land 37a entering the slot 38 in surface 35.

This particular arrangement tends to wedge the pick firmly on the holder, the camming surfaces 34 and 35 acting to push the bar 25 against the leading edge of the hole 27.

To enable release of the pick from the pick holder, for example, when it is desired to replace the cutter piçk the pick holder is provided with an aperture 39 as shown which opens into aperture 27 through which is possible to insert a tool to bear against the bottom surface of the bar 25 and force the bar upwardly. When this is done the neoprene plug 31 rises up surface 29 and enables the pick to be removed from the pick holder.

Figure 5 shows an embodiment of the invention in which the pick 40 is located on a holder 41 the body 42 of the pick being reentrant, preferably V-shaped and being located on the leading edge 43 of the pick holder which is shaped to conform to it.

As in the arrangements of Figures 1 to 4 the top member of the pick has a rear surface which extends at an angle of approximately 10' to the normal from its under surface and has a land 46 engaging in a slot 47 formed in the surface 48 of the holder 41 (in a manner similar to that of Fig. 4).

The lower end of pick body 42 may, as described in my Co-pending application no: 30908/76 serial no 1590825 be bifurcated and held in position by a resilient member carried by the pick holder.

In the arrangement of Figure 5 the top member of the pick has an aperture 49 in which a pin 50 is a friction fit. In use pin 50 enters and is held in a resilient steel bush 51 in a hole 52 in the holder.

It will be seen that, as in the arrangement of Figures 1 to 4, when the pick is hammered down on the holder the camming action of the surfaces 45 and 48 forces the pin 50 to wedge it against the front of the hole 52.

It will be appreciated that the described arrangements provide cutter picks and cutter pick arrangements in which all the cutting forces encountered under normal cutting conditions are absorbed by the cutter pick and in fact because of its particular shape and the shape of the leading edge of the holder most of these forces encountered by the cutting pick are transmitted directly through it to the cutter pick holder where they act to compress the material of the holder. This feature provides that the life of the pick holder may be considerably extended compared with known forms of pick holder in which such forces act to elongate or expand the holder.

With the above described arrangement the cutting tip is as wide as possible whilst at the same time the overall dimensions of the arrangement are relatively small with the result that the arrangement is economical to manufacture.

The simplicity of the design has the result that the holder is economical to make. The width of the holder is such that it does not extend on either side of the vane of the shearer drum or other carrier on which it is mounted and it is an important advantage of the design now described that the pick holder is not wider than the width of the cutter pick which it supports (at least in the region where the cutter pick cuts into a mineral) with the result that the holder is not scrubbed by any mineral being cut.

In addition to the above arrangement described in this application has the advantages of providing secure location of the pick on the holder. In particular the substantial size of the bar 25 which is located within the body of the pick holder acts to hold the cutter pick on the holder securely. Again, the angled rearmost surface 34 which abuts surface 35 of the pick holder provides security of the pick on the pick holder when, in use, it is moved in the direction of the arrow X.

WHAT I CLAIM IS: 1. A mineral cutter pick arrangement comprising a cutter pick holder having an elongated leading surface and an upper surface, and a mineral cutter pick comprising a body member with a leading edge and a rear surface, wherein the body member is formed with a cutter tip at one end of said leading edge and with a top member extending rearwardly of said rear surface, the bottom surface of said top member and the upper surface of said holder being provided with interengaging means enabling the pick to be located on the holder, wherein the widest dimension of the cutter pick transverse to forward direction of movement of the cutter pick adjacent the cutter tip is greater than the corresponding dimension of the cutter pick holder, and wherein the rearmost surface of the top member of the cutter pick extends from the under-surface of said top member at an angle which diverges from the normal to the under-surface of the said top member which rearmost surface bears, in use, against a surface of the pick holder which conforms to said rearmost surface.

2. An arrangement according to Claim 1, wherein the rearmost surface of the top member extends at an angle diverging from the normal to the under-surface of the top member of approximately 10 degrees.

3. An arrangement according to Claim I or Claim 2, wherein said rearmost surface of the top member is provided with means for engaging said conforming surface of the pick holder.

4. An arrangement as claimed in Claim 3, wherein the said means comprises a land formed on the rearmost surface of the top member for engaging a slot formed in the conforming surface of the pick holder.

5. A mineral cutter pick arrangement according to any of Claims 1 to 4, wherein said interengaging means locating the pick on the holder comprises a cylindrical bar projecting from the under-surface of the top member and engaging a corresponding aperture formed in the pick holder.

6. An arrangement according to Claim 5, wherein the bar is circular in cross-section.

7. An arrangement according to Claim 5 or Claim 6, wherein said bar extends from said top member at least as far as does said body member.

8. An arrangement according to any one of Claims 5 to 7 and including interengaging means ensuring the location of said bar in said aperture.

9. An arrangement according to Claim 8, wherein said interengaging means comprises of a resilient member located in the pick holder engaging a cut-out portion of said bar.

10. An arrangement according to any one of Claims 5 to 9 and including means enabling release of the cutter pick from the holder, said means comprising an aperture formed in the pick holder to intersect said first-mentioned aperture to allow the insertion of a tool therein to force said bar from said firstmentioned aperture.

11. An arrangement according to any of Claims 1 to 4 wherein said interengaging means locating the pick on the holder comprises a pin fitted in a blind aperture in the top member to extend from the undersurface thereof and engagable in an aperture formed in the top surface of the pick holder.

12. An arrangement according to Claim 11, wherein said pin is located in a bush in the blind aperture formed in the top surface of the pick holder.

13. An arrangement according to any one of Claims 1 to 12, wherein the rear surface of the body member is shaped to conform to the leading edge of the pick holder.

14. An arrangement according to Claim 13, wherein the rear surface of the body member is re-entrant.

15. An arrangement as claimed in Claim 14, wherein the rear surface of the body member is arcuate.

16. A mineral cutter pick arrangement substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. which it supports (at least in the region where the cutter pick cuts into a mineral) with the result that the holder is not scrubbed by any mineral being cut. In addition to the above arrangement described in this application has the advantages of providing secure location of the pick on the holder. In particular the substantial size of the bar 25 which is located within the body of the pick holder acts to hold the cutter pick on the holder securely. Again, the angled rearmost surface 34 which abuts surface 35 of the pick holder provides security of the pick on the pick holder when, in use, it is moved in the direction of the arrow X. WHAT I CLAIM IS:

1. A mineral cutter pick arrangement comprising a cutter pick holder having an elongated leading surface and an upper surface, and a mineral cutter pick comprising a body member with a leading edge and a rear surface, wherein the body member is formed with a cutter tip at one end of said leading edge and with a top member extending rearwardly of said rear surface, the bottom surface of said top member and the upper surface of said holder being provided with interengaging means enabling the pick to be located on the holder, wherein the widest dimension of the cutter pick transverse to forward direction of movement of the cutter pick adjacent the cutter tip is greater than the corresponding dimension of the cutter pick holder, and wherein the rearmost surface of the top member of the cutter pick extends from the under-surface of said top member at an angle which diverges from the normal to the under-surface of the said top member which rearmost surface bears, in use, against a surface of the pick holder which conforms to said rearmost surface.