AU623804B2 - Chisel holder for machines for excavating rock and mineral substances - Google Patents

Description

NS E GURNE. SYEDNEY PERTH

AUSTRALIA

PATENTS ACT 1952 Form COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Short Title: Int. Cl: Application Number: Lodged: Complete Specification-Lodged: Accepted: Lapsed: Published: SPriority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: FIRMA MICHAEL KOMOTZKI Address of Applicant: GERNOTSTR. 4 D 4600 DORTMUND 13

GERMANY

Actual Inventor: Address for Service: GRIFFITH HACK CO., 601 St. Kilda Road, Melbourne, Victoria 3004, Australia.

Complete Specification for the invention entitledt CHISEL HOLDER FOR MACHINES FOR EXCAVATING ROCK AND MINERAL SUBSTANCES.

The following statement is a full description of this invention including the best method of performing it known to me:- 2 The present invention relates to a chisel holder for machines for excavating rock and mineral substances ir accordance with the preamble to the main Patent Claim.

This type of holder, which has become established in practice, is described in the German DE-GM 88 05 961.

The problem underlying the present invention is how to improve the known holder in such a manner that complete fixing of the actual holding device is effected in such a manner that, despite the different forces acting upon it, a deflection of the various components of the holder cannot occur.

According to the present invention there is provided a chisel holder for machines for excavation of rock and mineral substances having a base body carried by the oo 15 machine, with a holding device which is detachable from the o base body on which it is held in position by fixing means inserted into a drilled hole, ard which has a receiving cavity for the chisel, where the b.ise body has an upwardly S* protruding anchor body which is essentially square in ot aa 20 cross-section and the holding device has a matching a receiving cavity which covers the anchor body on all sides like a hood, the holding device and the base body possessing support surfaces which act in conjunction, wherein: a) the base body possesses a receiving cavity disposed at right angles to the axis of the chisel and located in front of said chisel when seen in the direction of rotation of said chisel, and the holding device possesses a push-in component, the shape of which matches that of the receiving cavity, b) the anchor body projects out at right angles to the axis of the chisel in the direction opposed to the LIdirection of rotation of the chisel and the holding device q 2A has an angle flange into which a hood is machined on the inside, which extends parallel to the axis of the chisel towards the underside of the base body, c) the fastening means is in the form of a plain stud which is inserted into a blind hole which extends parallel to the axis of the chisel through the upper part of the base body, through the push-in component in the receiving cavity and finally ends in the lower part of the base body, d) there is also a receiving cavity provided in the holding device and the base body to accommodate the shaft of the chisel.

Expressed in other words, the complete fixing of the holding device is effected by the acting together of 15 interlocking elements, namely the anchor body and the hood on the one hand and the receiving cavity and the push-in component on the other hand. The only degree of freedom which this holder still possesses is a movement opposed to S' the push-in direction of the push-in component into the receiving cavity, and this movement, in the case of the new inventive device, is not only suppressed by the actual *0 fastening device, namely a shearing bolt, but, at the same time, the actual shaft of the chisel also contributes to s" the fixing effect.

In the case of the new device, no use is made of screw-threaded elements for fixing the holding device onto the base body, and the shearing bolt utilised can be easily secured because it is not subjected to any force components which could push it out.

An example of embodiment of the invention will be described in greater detail in what follows, with reference to the accompanying drawings.

M' I- Depicted in the drawings is a base body 1 which serves to carry a holding device 2. Both structural components have a receiving cavity 3 for a chisel. The holding device 2 is configured as an angular component having an angle flange 30 into which a hood 8 is machined on the inside. In the other shank of the holding device 2 there is a receiving cavity 3 for the chisel and also a drilled hole 20 for accommodation of a fastening means.

An anchor body 9 is provided on the base body 1 and it extends in the direction opposite to the direction of rotation of the chisel and it can act in conjunctionwith the hood 8 because its size is adapted to the size of said hood 8.

0) 640, 0 4 4 00 4 4O 4 105 4 4 In addition, a receiving cavity 6 is provided in the base body 1, said cavity being configured in such a manner that the free end portion of the long shank of the holding device 2 can be inserted into it. This end portion is thus push-in component 7.

A blind hole 20 is drilled through the base body 1 on both sides of the receiving cavity 6 to accommodate a fastening means which is a plain stud 21.

When the holding device 2 is placed ona, or inserted into, the base body 1 in such a manner that the anchor body 9 engages in the hood 8 and the push-in component 7 engages in the receiving cavity 6, this results in the formation of support surfaces which act in conjunction in such a way that the underside of the push-in component 7 is seated as the support surface 4 on the upper side of the lower wall of the receiving cavity 6, that is to say, on the support surface 5 which it provides, the free end of the push-in component 7 forms a support surface and the internal end wall of the receiving cavity forms a support surface 11, the upper side of the anchor body 9 forms a support surface 12 which acts in conjunction with the inner surface of the hood 8 which forms a support surface 13.

i I ~1 4 The peripheral borders of the anchor body 9 provide support surfaces 15 and the peripheral borders of the hood cavity 8 form support surfaces 14, so that said surfaces act in conjunction.

The border regions around the hood 8 form a flat U-shaped support surface 16 and the border regions around the anchor body 9 form a support surface 17.

Lastly the lateral regions of the push-in component 7 form the support surfaces 18 which act in conjunction with the inner side walls of the receiving cavity 6 which are configured as support surfaces 19.

S The stud 21 is inserted into the drilled hole 20 when the holding device 2 has been nested into the base body 1 and is thus exposed a to double shearing forces.

aor At the same time, the chisel is inserted into the receiving cavity 3 provided for this purpose, the result of this being that the force acting in the opposite direction to the -ush-in direction (arrow 22) on the holding device 2 is taken up torque- 1lIt l- free by chisel and stud, thus ensuring a good and enduring fixing thereof.

With the use of this device, there is a complete fixing of the holding device by means of structural components which act as interlocking elements, namely the receiving cavity 6 and the push-in component 7 on the one hand, and the anchor body 9 and the hood 8 on the other hand. The only possible degree of freedom is directed against the push-in direction 22, and this remaining degree of freedom of movement is blocked by the stud 21 and the shaft of the chisel.

Claims (2)

1. Chisel holder for machines for excavation of rock and mineral substances having a base body carried by the machine, with a holding device which is detachable from the base body on which it is held in position by fixing means inserted into a drilled hole, and which has a receiving cavity for the chisel, where the base body has an upwardly protruding anchor body which is essentially square in cross-section and the holding device has a matching receiving cavity which covers the anchor body on all sides like a hood, the holding device and the base body possessing support surfaces which act in conjunction, wherein: a) the base body possesses a receiving cavity disposed at right angles to the axis of the chisel and 15 located in front of said chisel when seen in the direction of rotation of said chisel, and the holding device .that of the receiving cavity, b) the anchor body projects out at right angles to the axis of the chisel in the direction opposed to the direction of rotation of the chisel and the holding device has an angle flange into which a hood is machined on the inside, which extends parallel to the axis of the chisel towards the underside of the base body, c) the fastening means is in the form of a plain stud which is inserted into a blind hole which extends parallel to the axis of the chisel through the upper part of the base body, through the push-in component in the receiving cavity and finally ends in the lower part of the base body, d) there is also a receiving cavity provided in the holding device and the base body to accommodate the shaft of the chisel. TE 6

2. A chisel holder for machines for excavation of rock and mineral substances substantially as described herein with reference to and as illustrated in the accompanying drawings. DATED this 26th day of February, 1992. FIRMA MICHAEL KOMOTZKI By Its Patent Attorneys GRIFFITH HACK CO. Fellows Institute of Patent Attorneys of Australia. 00 0 0 0