DE29710357U1 - Chisel holder with abutment for an extraction tool - Google Patents

Description

Company Michael Komotzki, Gernotstr. 4, 44319 Dortmund "Chisel holder with abutment for an extraction tool"

The innovation concerns a chisel holder according to the generic term

of claim 1.

Such a chisel holder is known from DE 94 02 242 U1.

In the known chisel holder, the chisel sleeve has a length that corresponds to the chisel shaft that is to be accommodated by the chisel sleeve. The hole provided in the chisel sleeve therefore represents only a receiving hole for accommodating the chisel shaft. Within this

A circumferential groove is provided in the mounting hole, into which a clip ring of the chisel engages in order to ensure that the chisel is securely seated.

The well-known chisel holder is equipped with an extraction tool for the

Chisel bushing is provided, which is designed as an expandable tool and engages in this groove. The disadvantage is that the groove wears out due to the constant action of the clip ring. When changing the chisel bushing, it can therefore happen that the groove does not provide a reliable support for the

Extraction tool.

The innovation is therefore based on the task of improving a generic chisel holder in such a way that an abutment for an extraction tool is created, which

This means that it is not subject to wear when the chisel is in use and therefore forms a reliable contact surface for the extraction tool.

This task underlying the innovation is carried out by a

a chisel holder with the features of claim 1.

In other words, the innovation proposes to move the abutment for the extraction tool from the area of influence of the chisel or the chisel shaft to a section of the chisel sleeve that is not designed to accommodate the chisel shaft.

For this purpose, the innovation proposes to lengthen the chisel bushing compared to the standard chisel bushings, so that in addition to the section of the bore serving as a receiving bore for the chisel shaft, an additional bore is provided in the chisel bushing, which is used during operation of the

Chisel is not subjected to pressure by the chisel or its chisel shaft. This additional hole in the chisel bushing has a projection that can serve as a support for an extraction tool and ensures that the extraction tool works reliably.

The projection can basically be achieved in two different ways: Firstly, by reducing the cross-section of the bore, whereby a shoulder protruding into the bore is provided, or secondly, by increasing the cross-section

the bore so that an undercut is created into which an extraction tool can engage.

A particularly simple manufacture of the chisel sleeve is possible if both holes are connected to each other, i.e.

A continuous bore must be created which then has two different sections: the receiving section for the chisel shaft and the additional section with the abutment for the extraction tool.
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An example of the innovation is explained in more detail below using the drawing.

Fig. 1 schematically shows a cross section through a

Chisel holder with a purely schematic

indicated, inserted chisels,

Fig. 2 a chisel for use with a chisel

holder according to Fig. 1 and
Fig. 3 is a view similar to Fig. 1, but with a

the extraction tool inserted into the chisel sleeve. 5

In Fig. 1, 1 generally designates a chisel holder, whereby the chisel holder 1 has a cavity 2 into which a chisel sleeve 3 is inserted. A schematically indicated chisel 4 can be inserted into the chisel sleeve 3, the chisel shaft end of which is marked with 5. The chisel 4 is, as

as can be seen from Fig. 2, is provided with a clip ring 6, wherein a circumferential groove 7 in the chisel bushing 3 serves to accommodate this clip ring 6, so that the chisel 4 is secured in the chisel bushing 3.

The chisel bushing 3 has a continuous bore 8, which is designed in a first section 9 as a receiving bore for the chisel shaft and has the groove 7 there and which also has an additional section 10 which extends beyond the chisel shaft end 5. In this

An inwardly projecting, circumferential shoulder 11 is provided in the additional section 10, which reduces the clear width of the bore 8 and forms an abutment for an extraction tool 12, as can be seen in particular from Fig. 3.

The extraction tool 12 is easier and cheaper to manufacture than expandable extraction tools and it enables the transmission of very high forces. It has a shaft 14, a pressure piece 15 and a lock nut 16, which secures the pressure piece 15 on the shaft 14.

The pressure piece 15 rests against the shoulder 11, whereby the shoulder 11 in normal operation of the chisel holder 1, i.e. with the chisel 4 inserted, is not influenced by the chisel or its chisel shaft so that for changing the chisel bushing 3, the

This paragraph 11 serves as a support for the extraction tool 12

is available undamaged. Wear of the groove 7, which may be caused by the clip ring 6, does not affect the function of the abutment and ensures that the chisel bushing 3 can be easily replaced.
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Deviating from the embodiment shown, an abutment can be provided in the additional section 10 of the chisel bushing by providing a groove similar to the groove 7 or by providing individual recesses in the wall of the chisel bushing 3 instead of such a circumferential groove

are provided, into which, for example, a hook-like or expandable extraction tool can engage.

Claims (4)

HABBEL &HABBEU.'-' :-~..vipl?-cnq. h.-q. habbel PATENT ATTORNEYS DIPL.-INQ. LUTZ HABBEL EUROPEAN PATENT ATTORNEYS PO Box 3429 ♦ 48019 Münster DIPL.-QEOQR. PETER HABBEL TELEPHONE (0251) 535 780 ♦ FAX (0251) 531 996 VNS £RE ACTS: {please specifyj K92/19903 Iu/SC Münster, 12 June 1997 Company Michael Komotzki, Gernotstr. 4, 44319 Dortmund "Chisel holder with abutment for an extraction tool" Protection claims: 1. Chisel holder, with a chisel sleeve that is detachably secured in a cavity and has a receiving bore for receiving the chisel shaft, characterized , that the chisel bushing (3) is longer than the chisel shaft to be accommodated in the chisel bushing (3), and that the chisel bushing (3) has, in addition to the receiving bore for the chisel shaft, a bore which creates a starting surface for an extraction tool (12). * 2. Chisel holder according to claim 1, characterized in that the Receiving bore and the additional bore in the chisel bushing (3) are designed as a single bore (8) which has a first section (9) designed as a receiving bore for the chisel shaft and a closing additional section (10) which creates the attachment surface for an extraction tool (12). 3. Chisel holder according to claim 1 or 2, characterized in that the chisel bushing (3) has a recess in the additional bore or paragraph (11) extending into the additional section (10). 4. Chisel holder according to claim 1 or 2, characterized in that the chisel bushing (3) in the additional bore or in the additional section (10) has a recess which widens the clear cross-section of the bore (8).