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Patent Searching and Data


Title:
CLIP FOR PICK IN A PICK HOLDER
Document Type and Number:
WIPO Patent Application WO/2004/036063
Kind Code:
A1
Abstract:
A clip (10) includes a yoke (12) and a locking member (16) secured to the yoke (12), the locking member (16) being moveable between an open position in which the yoke can be located in its operative position, and a locked position in which the yoke is locked in its operative position. In use the clip (10) is used to secure a pick (32) to a pick holder (28). The yoke of the clip locates in a groove (36) in a tail of the pick and the locking member is clipped around the tail of the pick.

Inventors:
Wheeler, Charles James (1 Steele Street, 2197 Steeledale, ZA)
Engelbrecht, Willem Carel (1 Steele Street, 2197 Steeledale, ZA)
Da Sousa, Joaquim Antonio Soares (1 Steele Street, 2197 Steeledale, ZA)
Application Number:
PCT/IB2003/004515
Publication Date:
April 29, 2004
Filing Date:
October 14, 2003
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
GENESIS MINING TECHNOLOGIES (PROPRIETARY) LIMITED (Ground Floor, Serenade Park Serenade Road, 1600 Elandsfontein, ZA)
JOY GLOBAL (SOUTH AFRICA) (PTY) LTD (T/A Joy Mining Machinery, 1 Steele Street, 2197 Steeledale, ZA)
Wheeler, Charles James (1 Steele Street, 2197 Steeledale, ZA)
Engelbrecht, Willem Carel (1 Steele Street, 2197 Steeledale, ZA)
Da Sousa, Joaquim Antonio Soares (1 Steele Street, 2197 Steeledale, ZA)
International Classes:
E21C35/197; F16B21/18; (IPC1-7): F16B21/16; E21C35/19; E21C35/197; F16B21/12; F16B21/18
Foreign References:
US2402693A1946-06-25
US3926089A1975-12-16
US4553891A1985-11-19
US5518332A1996-05-21
US5704100A1998-01-06
US6070945A2000-06-06
Attorney, Agent or Firm:
Donald, Heather June (Spoor & Fisher, PO Box, 2024 Craighall, 41312, ZA)
Download PDF:
Claims:
CLAIMS
1. A clip including a yoke and a locking member secured to the yoke, the locking member being moveable between an open position in which the yoke can be located in its operative position, and a locked position in which the yoke is locked in its operative position.
2. The clip of claim 1 wherein the locking member is secured to the yoke via a head having two apertures.
3. The clip of claim 2 wherein the locking member is a loop or ring having two ends located one in either aperture so that the loop has a spiral shape and so that a force is required to move the loop between its open and locked positions.
4. The clip of claim 2 or claim 3 wherein the head has a front surface, a rear surface and two opposed side surfaces with the apertures being located in the side surfaces.
5. The clip of claim 4 wherein one of the apertures is located above the other of the apertures.
6. A clip including a loop or ring having two spaced ends with a leg extending from each end into the loop or ring to define a relatively narrow entrance to a relatively wide object receiving zone so that in the use the relatively narrow entrance can be resiliently flexibly deformed as the clip is forced onto an object which is to be retained in the relatively wide object receiving zone.
7. The clip of claim 6 wherein the clip is made of a single piece of wire.
8. A clip substantially as herein described and illustrated with reference to the accompanying drawings.
9. A cutting arrangement including a pick retained within a pick holder by a clip as claimed in any one of claims 1 to 8, the pick having a tail with a groove engaged by the clip.
10. The cutting arrangement of claim 9, insofar as it is dependant on any one of claims 1 to 5, wherein fhe clip is in its locked position with the locking member clipped around the free end of the tail and with the yoke located in the groove.
11. A cutting arrangement substantially as herein described and illustrated with reference to the accompanying drawings.
Description:
CLIP FOR PICK IN A PICK HOLDER FIELD OF THE INVENTION This invention relates to a clip. More specifically, but not exclusively, this invention relates to a clip for retaining a pick within a pick holder.

BACKGROUND TO THE INVENTION A pick holder is fixed to a rotatable cutting drum of a continuous miner. The pick holder holds a pick, which is removably secured to the pick holder by a clip. The prior art clip has proved difficult to remove and a special tool is sometimes used to remove the clip. Since the pick needs to be replaced on a regular basis, costly production time is lost in changing the pick.

SUMMARY OF THE INVENTION According to the invention a clip includes a yoke and a locking member secured to the yoke, the locking member being moveable between an open position in which the yoke can be located in its operative position, and a locked position in which the yoke is locked in its operative position.

The locking member is preferably secured to the yoke via a head having two apertures. The locking member is preferably a loop or ring having two ends located one in either aperture so that the loop has a spiral shape and so that a force is required to move the loop between its open and locked positions. The head preferably has a front surface, a rear surface and two opposed side surfaces with the apertures being located in the side surfaces. The width of the head between the front and rear surfaces may be greater than the width of the yoke. One of the apertures is preferably located rearwardly of the other of the apertures. One of the apertures is preferably located above the other of the apertures. The loop is preferably made of spring steel.

The clip is preferably used to retain a pick within a pick holder, the pick having a tail with a groove therein, with the yoke in use engaging the groove and the loop, in its locked position, being located around the free end of the tail thereby preventing the yoke from being removed from the groove.

According to another aspect of the invention a cutting arrangement includes a pick retained within a pick holder by a clip, the pick having a tail with a groove engaged by the clip.

In the preferred form of the invention when the clip is in its locked position the locking member is clipped around the free end of the tail and the yoke is located in the groove.

According to another aspect of the invention a clip includes a loop or ring having two spaced ends with a leg extending from each end into the loop or ring to define a relatively narrow entrance to a relatively wide object receiving zone so that in the use the relatively narrow entrance can be resiliently flexibly deformed as the clip is forced onto an object which is to be retained in the relatively wide object receiving zone.

The clip is preferably made of a single piece of wire which is preferably made of spring steel.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a clip according to a first embodiment of the invention in its closed position; Figure 2 is a perspective view of the clip in its open position; Figure 3 is a side view of the clip ; Figure 4 is a cut-away perspective view of a pick and pick holder fitted with the clip ; Figure 5 is a perspective view of the tail of the pick with the pick holder removed for the sake of clarity; Figure 6 is a plan view of a clip according to a second embodiment of the invention; Figure 7 is a cut-away perspective view of a pick and pick holder fitted with the clip of figure 6; Figures 8 and 9 are perspective views of the tail of the pick fitted with the clip of figure 6 with the pick holder removed for the sake of clarity ; Figure 10 is a perspective view of a clip according to another embodiment of the invention in its open position; and Figure 11 is a perspective view of the clip of figure 10 in its closed position.

DETAILED DESCRIPTION OF THE DRAWINGS Referring firstly to figures 1 to 3, a quick release clip 10 has a U-shaped member or yoke 12 with a head 14 to which a spring steel loop 16 is pivotally mounted.

The head 14 has two side surfaces 18, a flat front surface 20 and a rear surface 22. Offset apertures 24 are located one in either of the side surfaces 18. The free ends 26 of the loop 16 locate within the apertures 24 and the loop 16 has a spiral shape imparted to it which allows it to clip or spring between its open and locked positions.

Referring now to figures 4 and 5, a cutting arrangement 27 includes a pick holder 28 which contains a sleeve 30 into which a pick 32 is located. The pick 32 has a tail 34 which projects from the pick holder 28. The tail 34 of the pick 32 has a circumferentially extending groove 36. The flat front surface 20 of the head 14 of the clip 10 abuts a flat surface 38 of the pick holder 28. The rear surface 22 of the head 14 overhangs the groove 36.

In use, the yoke 12 is located in the groove 36 whilst the clip 10 is in its open position. The clip 10 is then locked by clipping the loop 16 around the free end of the tail 34 thereby preventing the yoke 12 from being removed from the groove 36. When it is necessary to replace the picks 32, the clip 10 is opened and the yoke 12 removed from the groove 36 so that the pick 32 can be withdrawn from the pick holder.

The clip 10 can easily be fitted to and removed from the pick 32. Thus the clip can be removably locked to the pick 32. Whilst in its locked position, the clip 10 permits the pick 32 and the sleeve 30 to rotate relative to one another and relative to the pick holder 28.

Referring now to figures 6 to 8, a clip 40 includes a loop 42 with two spaced ends 44 from which legs 46 extend into the loop 42. The legs 46 define a relatively narrow entrance 48 to a relatively wide pick receiving zone 50 which in use locates around the groove 36 of the pick 32. The free ends 52 of the legs 46 are bent outwardly.

The clip 40 is made of spring steel so that the entrance 48 can be deformed outwardly in a resiliently flexible fashion when the clip 40 is pushed around the groove 36. The loop 42 locates around the free end 52 of the tail 34.

Referring now to figures 10 and 11, a clip 10.1 is similar to clip 10, but its yoke 12.1 and head 14.1 are the same thickness and are formed by a blanking process. The head 14.1 is bent towards the yoke 12.1, and the head 14.1 has a lower aperture 24.1 and an upper aperture 24.2 located above the lower aperture 24. 1. The loop 16.1 has a semi-circular section 16.2, two long linear sections 16.3 connected to the semi-circular section 16.2, and two short linear sections 16.4 which locate one within the lower aperture 24.1 and one within the upper aperture 24.2.

The loop 16.1 is made of spring steel and has a spiral shape imparted to it which allows it to clip or spring between its open and locked positions.

It will be appreciated that many modifications or variation of the invention are possible without departing from the spirit or scope of the invention.