GB1579105A

GB1579105A - Mineral cutting picks

Info

Publication number: GB1579105A
Application number: GB22278/78A
Authority: GB
Original assignee: Hall and Pickles Ltd
Current assignee: Hall and Pickles Ltd
Priority date: 1978-05-25
Filing date: 1978-05-25
Publication date: 1980-11-12
Also published as: DE2835410A1; AU3823178A; ZA784087B; ES475586A2; AU528733B2

Description

(54) IMPROVEMENTS IN OR RELATING TO MINERAL CUTTING PICKS (71) We, HALL & PICKLES LIMITED, a British Company of Hydra Works, Ecclesfield, Sheffield S30 3AF, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to mineral cutting picks and is concerned with a modification of the type of mineral cutting pick as defined in Claim 2 of Patent Specification No. 1 557 398 (Application No. 13824/77).

According to the present invention, a mineral cutting pick has a non-circular shank extending from a body for fitting nonrotatably in a socket in the pick box on a cutter drum or head, with its shank recessed at a distance from the body and housing therein a resilient member with a projection extending from at least one side of the shank, the projection being provided with a multiple toothed or multiple stepped surface following on from a lead-in surface adjacent the end of the shank remote from the body, whereby when the end of the shank remote from the body is pushed into the socket in a pick box the teeth or steps of the projection are depressed sufficiently to enable the shank to be inserted fully into the box.

The projection may secure the shank in the socket solely by frictional grip of the multiple-toothed or multiple-stepped surface against the socket under the urge of the resilient member; or the pick may be used in a pick box having either a cutaway or recess extending from the socket at the end remote from the body of the pick or a recess or hold extending from the socket intermediate its ends, by springing of part of the projection into the cutaway or recess or hole.

The resilient member may be housed in a recess in one side only of the shank, in which case the pick will be "handed" by the position of a cutaway or recess or hole in a pick box, unless the cutaway or recess or hole extends from both sides of the socket. Alternatively, the resilient member may be slidable in a lateral recess through the shank and be provided with a projection with a multiple-toothed or multiple-stepped surface at each end following on from a lead-in surface at each end, so that either (or both) projections can project from the shank, so that the pick will not be "handed" by reason of a cutaway or recess hole extending to one side only from the socket of a pick box.

The resilient member preferably consists of resilient plastics material (e.g., of polyurethane) with the or each projection forming an integral part thereof and having the or each multiple-toothed or multiplestepped surface and lead-in surface moulded therein.

Two embodiments of the invention will now 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 mineral cutting pick in accordance with the invention; Figure 2 is a front elevation of the pick partially in section on the line 2-2 of Figure 1; Figure 3 is a section on the line 3-3 of Figure 2; Figure 4 is a section through a pick box showing the shank of the pick of Figures 1 to 3 in place; and Figures 5 to 7 correspond respectively to the bottom of Figure 2 and to Figures 3 and 4, but relate to another embodiment of mineral cutting pick in accordance with the invention.

In Figures 1 to 3, a mineral cutting pick 1 has a rectangular shank 2 extending from a body 3 for fitting non-rotatably in a socket 4 in a pick box 5 (Figure 4), which would be welded or otherwise secured on a cutter drum or head (not shown), with a recess 6 in one side 7 of the shank housing therein a resilient member 8 with a projection 9 provided with a multiple-toothed surface 10 following on from a lead-in surface 11 adjacent the end 12 of the shank remote from the body, whereby when that end of the shank is pushed into the socket 4 in the pick box 5 the teeth of the projection 9 are depressed sufficiently to enable the shank 2 to be fully inserted into the box.

Although the projection 9 could secure the shank 2 in the socket 4 solely by frictional grip of the multiple-toothed surface 10 against the socket under the urge of the resilient member 8, the provision of the resilient member adjacent the end 12 of the shank enables the pick 1 to take advantage of a cutaway 13 extending from the socket at the end remote from the body 3 (which cutaway facilitates extraction of broken shanks) by springing of part of the projection 9 into the cutaway, with at least one tooth of the surface 10 engaging with the intersection of the cutaway 13 and the socket 4.

The arrangement shown in Figure 4 causes the pick 1 to be "handed". This would not be the case if the cutaway 13 were to extend to both sides of the socket, as indicated by broken line in Figure 4. This disadvantage does not arisc, however, if the arrangement of Figures 5 to 7 is adopted and in which the recess 6 extends laterally through the shank 2, the resilient member 8 bcing slidable in the recess and being provided with a projection 9 with a multiple-toothed surface 10 at each end following on from a Icad-in surface 11 at each end, so that either (or both) projections can project from the shank, so that the pick will not be "handed" by rcason of the cutaway 12 extending to one side only from the socket 4.

The recess 6 and resilient member 8 may alternatively, be provided anywhere along the shank 2, c.g.. ncarer to the body 3 than the end 12, to suit a recess or hole in the socket intermediate its ends.

WHAT WE CLAIM IS: 1. A mineral cutting pick having a noncircular shank extending from a body for fitting non-rotatably in a socket in a pick box on a cutter drum or hcad, with its shank recessed at a distance from the body and housing therein a resilient member with a projection extending from at Icast one side of the shank, the projection being provided with a multiple-toothcd or multiple-stepped surface following on from a Icad-in surface adjacent the end of the shank remote from the body whereby when the end of the shank remote from the body is pushed into the socket in a pick box the teeth or stcps of the projection are depressed sufficiently to enable the shank to be inserted fully into the box.

2. A pick as in Claim 1, wherein the resi- licnt member is housed in a recess in one side only of the shank.

3. A pick as in Claim 1, wherein the resilient member is slidable in a lateral recess through the shank and provided with a projection with a multiple-toothed or multiplestepped surface at each end following on from a lead-in surface at each end.

4. A pick as in any one of the preceding Claims wherein the resilient member consists of resilient plastics material with the or each projection forming an integral part thereof and having the or each multiple-toothed or multiple-steeped surface and lead-in surface moulded therein.

5. A mineral cutting pick substantially as hereinbefore described with reference to Figures 1 to 3 of the accompanying drawings.

6. A mineral cutting pick substantially as hereinbefore described with reference to Figures 5 and 6 of the accompanying drawings.

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. resilient member 8 with a projection 9 provided with a multiple-toothed surface 10 following on from a lead-in surface 11 adjacent the end 12 of the shank remote from the body, whereby when that end of the shank is pushed into the socket 4 in the pick box 5 the teeth of the projection 9 are depressed sufficiently to enable the shank 2 to be fully inserted into the box. Although the projection 9 could secure the shank 2 in the socket 4 solely by frictional grip of the multiple-toothed surface 10 against the socket under the urge of the resilient member 8, the provision of the resilient member adjacent the end 12 of the shank enables the pick 1 to take advantage of a cutaway 13 extending from the socket at the end remote from the body 3 (which cutaway facilitates extraction of broken shanks) by springing of part of the projection 9 into the cutaway, with at least one tooth of the surface 10 engaging with the intersection of the cutaway 13 and the socket 4. The arrangement shown in Figure 4 causes the pick 1 to be "handed". This would not be the case if the cutaway 13 were to extend to both sides of the socket, as indicated by broken line in Figure 4. This disadvantage does not arisc, however, if the arrangement of Figures 5 to 7 is adopted and in which the recess 6 extends laterally through the shank 2, the resilient member 8 bcing slidable in the recess and being provided with a projection 9 with a multiple-toothed surface 10 at each end following on from a Icad-in surface 11 at each end, so that either (or both) projections can project from the shank, so that the pick will not be "handed" by rcason of the cutaway 12 extending to one side only from the socket 4. The recess 6 and resilient member 8 may alternatively, be provided anywhere along the shank 2, c.g.. ncarer to the body 3 than the end 12, to suit a recess or hole in the socket intermediate its ends. WHAT WE CLAIM IS:

1. A mineral cutting pick having a noncircular shank extending from a body for fitting non-rotatably in a socket in a pick box on a cutter drum or hcad, with its shank recessed at a distance from the body and housing therein a resilient member with a projection extending from at Icast one side of the shank, the projection being provided with a multiple-toothcd or multiple-stepped surface following on from a Icad-in surface adjacent the end of the shank remote from the body whereby when the end of the shank remote from the body is pushed into the socket in a pick box the teeth or stcps of the projection are depressed sufficiently to enable the shank to be inserted fully into the box.