ZA200506063B

ZA200506063B - Clamp for mining rotating cutting insert

Info

Publication number: ZA200506063B
Application number: ZA200506063A
Authority: ZA
Inventors: Wasyleczko Zenon
Original assignee: Wasyleczko Zenon
Priority date: 2003-07-14
Filing date: 2004-07-05
Publication date: 2007-12-27
Also published as: WO2005005780A1; PL361247A1; PL202818B1

Description

3 R

CLAMP FOR MINING ROTATING CUTTING INSERT.

The object of this invention is a clamp for rotating cutting insert made from wire. The clamp is designed to prevent the cutting insert from falling out of the holder mounted on the winning machine and simultaneously to allow the cutting insert placed in the holder to rotate round its own axis.

There have been known similar safety devices made from wire. The designs assumed that the device is mounted in a special groove on the top of the holder so, as the rotating cutting insert could not get out of the holder when the winning machine is in operation. For example, the German patent number 37 04 650 is a shackle made from wire consisting of two lengthways, parallel to each other arms which from the closed side are bent so as to form an inside . loop while from the open side they are first narrowed and then parted outside.

Points formed between tops of the lobes and narrowings are so matched that a circle can be inscribed between them. The diameter of the circle will be equal to the diameter of the bottom of the groove on which the shackle is mounted. Another example is the Polish patent number 172654 which is a clamp for rotating cutting insert made from wire shaped into three evenly distributed arms of which the arm opposite to the opening is hooked outward in relation to the other arms. The narrowings between arms are symmetrical and a circle can be inscribed between them. The diameter of the circle will be equal to the diameter of the bottom of the groove of the rotating cutting insert. A similar solution as above is also known from the application number

PCT/US99/13642, however in this case the arms are located in one plane.

The disadvantage of the devices described above is that the mining output moved along the cutting insert often opens the arms or pulls them out from the groove getting the cutting insert out of the holder. The invented clamp for the rotating cutting insert is made from wire with random section, though most often the section is circular of square. The wire is shaped in several loops alternatively joint with recesses while the tops of the wire arc brought closer together and hooked up towards the centre of the flat figure shaped by the wire. Points of curves mostly projecting towards the flat figure and tops of the wire are so matched and distributed that a circle of a diameter equal to the diameter of bottom of the groove of the rotating cutting msert holder can be inscribed. The loops can be symmetrical or non-symmetric but it is always more advantageous if a circle can be inscribed into the tops. The diameter of the circle must be bigger than the diameter of the rotating cutting insert holder to form an eye between the edges of the cutting insert holder and loops of the clamp. This solutions securcs the cutting insert in the holder, in case of loops with a gap between tops, this solution ease opening of the gap when the clamp is mounted or removed from the groove of the rotating cutting insert holder.

The invention provides a clamp as set forth in the appended claims.

This device is clearly described by a drawing; figure 1 shows a clamp with four loops evenly distnbuted /in a view, figure 2 shows a clamp with 4 loops distributed evenly / pairs in view, figure 3 shows a clamp with three loops and arms in curvy line, figure 4 shows a clamp with three loops and arms in arcuate line. Figurc 5 shows a rotating cutting insert before it is mounted in the holder and locked by a clamp / axenometric projection.

A clamp made from round wire contains arms 1 forming a loop 2 turning into recesses 3 which subsequently make loops with ends 5 hooked out towards the centre of a figure crcated by arms 1. Points s on the tops of recesses 3 on the inner side of the figure and the face 6 of the ends 5 are so distributed that a circle of the diameter d equal to the diameter of the bottom 7 of the groove 8 on the holder 9 of the cutting insert 12 can be inscribed. It is favourable to locate the ends 5 convergently to each other and to keep the closest distance a of the gap between them smaller than the diameter d of the inscribed circle.

AMENDED SHEET DATED 15 DECEMBER 2005

-» i WO 2005/005780 PCT/PL2004/000052

The tops of the loops 2 and 4 are distributed symmetrically and a circle of diameter D can be inscribed between them. The loops 2 and 4 protrude above the edge K of the holder 9 of the rotating cutting insert 12 forming eyes 10 which prevents the cutting insert from falling out. Furthermore, in case of the loops 4 designed for placing and removing the clamp from the holder of the cutting insert 11, the arm tips of the tool designed for opening the ends are inserted into the eyes 10. It is beneficial that the distance A between the inner tops w of loops 4 is bigger than the distance formed between points s of the tops of the recesses 3 and is approximately equal to the diameter d which is at least two thicknesses of the wire from which the clamp was made.

In a modified version (fig. 2) the shape of the clamp is slightly elongated, though preserving all features of the above-described design. The difference is that the loops 2 and 4 are distributed to each other uniformly in pairs and the recess 3 located opposite the ends S is narrower than other curves /recesses 3.

In successive designs (fig/ 3 and 4) the clamp consists of three loops: one loop 2 and two loops 4 with ends 5. The arms 1 joining the loop 2 with loops 4 are curvy or arcuate.

Claims

CLAIMS A clamp for retaining a rotatable cutting insert relative to a holder, the clamp comprising a length of wire bent to form a plurality of outwardly protruding loops Joined by inwardly extending recesses, the wire having ends which are inwardly re- entrant, end loops extending to the said ends and opposed recesses having inner surfaces (s) defining between them a clear distance which is less than the distance (A) defined between inner surfaces (w) of the end loops.
2. A clamp according to claim 1 wherein the distance (A) between the inner surfaces (w) of the end loops of the wire 1s greater than the clear distance defined between inner surfaces (s) of the opposed recesses by at least twice the thickness of the wire.
3. A clamp according to claim 1 or claim 2 wherein the ends of the wire converge : inwardly towards one another.
4. A clamp according to any one of the preceding claims wherein inner surfaces of the recesses (s) and the ends of the wire lie on a circle. AMENDED SHEET DATED 15 DECEMBER 2005

Ld *
5. A clamp according to claim 4 wherein the ends of the wire define between them a clear distance (a) which is less than the diameter of the circle.
6. A clamp according to any one of the preceding claims wherein the loops are arranged symmetrically and have outer extremities lying on a circle.
7. A clamp according to any one of claims 1 to 5 wherein the loops are arranged non- symmetrically and have outer surfaces lying on a circle.
8. A clamp according to claim 7 and including a pair of end loops adjacent the ends of the wire and a single intermediate loop between the end loops.
9. A clamp as herein described with reference to any one of Figures 1 to 4 of the accompanying drawings. AMENDED SHEET DATED 15 DECEMBER 2005