DE7010555U - CHISEL AND BRACKET FOR THE SAME. - Google Patents

Description

G 70 10 555.4 May 27, 1970

Ualter Becker KG IiIMWCSi Dia * (J.

(Tum

Cutting chisel and holder for the same

The innovation concerns a reversible, symmetrical one that can be inserted into the mounting seat of a chisel holder Cutting chisel with several cutting edges and one suitable Neissei holder.

To an economical replacement of the rapid wear and tear To ensure underlying cutting chisels in mining, it is already known to make the cutting chisels reversible in order to avoid the need for wear the cutting point to replace the whole chisel. A known chisel of this type therefore consists of one annäl ernd conically formed at both ends Shank, the middle part of an oppositely beveled ring shoulder running around the surface of the fuselage possesses that protrudes from the chisel surface and with each

one beveled side fits into a correspondingly shaped seat in the mounting block. At both symmetrical At the ends there is also a rounded locking groove running around the circumference of the shaft for receiving a locking pin (DAS 1 224 237). The production of this Meisseis is relatively expensive and cumbersome, since a large number of machining operations with cutting machines is required before the different shape of the shaft ends, ring shoulder and locking groove is achieved. In addition, the locking groove for the unused chisel point is severely affected by the rock while the other chisel point is in use, so that when repositioning the chisel there is no snug fit is more guaranteed in the bracket block. The same disadvantage also occurs with another known cutting chisel of the type mentioned at the beginning, the one used for locking is provided in the mounting block on its side surfaces with a set of tooth-like webs, which in appropriately shaped Grooves can be clamped in the mounting block (USA patent 1 078 082).

The invention is based on the object of creating a reversible cutting chisel which, compared to the known chisels, is simple and cheap to manufacture and independent of | from the wear of its outer surfaces can always be reliably determined in the chisel holder.

According to the innovation, the cutting chisel is used for this purpose a rhombic basic shape and openings for receiving a locking device that can be inserted through a hole in the pin holder

Such a shaped chisel requires only a few operations after its basic rhombic shape has been produced, whereby its production is considerably more economical than that conventional chisel can be designed. Furthermore, according to the innovation, it is ensured that the locking device does not prematurely restrict the reversibility of the Neissel due to wear, breakage or other wear and tear.

The openings in the chisel are preferably larger than the hole in the chisel holder and for receiving a locking cam of a bow spring serving as a locking element educated.

In addition, a chisel consists of an oblique Profile bar section cut off from the free bar end to the bar longitudinal axis of approximately rectangular cross-section, the length of which in the longitudinal direction of the rod is equal to the longer diagonal of the rhombus before the further processing of the chisel.

In the case of such a cutting chisel, the mounting block with a thickness corresponding to the thickness of the chisel is advantageous Milled recess into which a piece of steel forming the second side of the acute-angled fleissel seat is welded.

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The innovation is shown below with the aid of the drawings explained in more detail, and to illustrate:

FIG. 1 shows a schematic view of a cutting chisel locked in a chisel holder the innovation,

Figure 2 is a plan view of the cutting chisel in Figure 1,

FIG. 3 shows a section through a chisel holder with a cutting chisel,

FIG. 4 a further section through the Neissel holder, representing the locking device and

Figures 5 and 6 plan view and cross section of a profile bar as a material for producing a cutting chisel according to the innovation.

As can be seen from FIGS. 1 to 4, the cutting chisel 1 according to the invention consists of an approximately one elongated rhombic basic shape having iron piece with beveled at the edges surfaces 2 and into the Cutting edges 3, 4 made of sintered UoIframkarbid, Uidia iron or another suitable one used longitudinal ends Material. Notwithstanding, each chisel point can be used instead of only

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one also have two cutting edges inserted on opposite sides of a point, so that each chisel in a total of four working positions in the chisel holder can be built in, by either only having is rotated about its longitudinal axis or about its transverse axis by 180 °.

The chisel 1 also has two symmetrical slots 5 for locking the chisel in a chisel holder 6. -Dar chisel holder 6 consists of a holding block 7 provided with a wedge-shaped recess 8, into which the acute-angled parts of the cutting chisel 1 corresponding to the wedge-shaped recess can be inserted approximately up to its longitudinal center. A slot bore 9 in the mounting block 7 coincides with one of the narrow sides of the slots 5 in the chisel 1 when this is inserted. The slotted hole 9 is smaller than the slots 5 in the chisel 1. At one end of the chisel holder 6, the slotted hole 9 has an enlarged recess 10 for the purpose of easier insertion of a locking element: the bow spring 11 with a locking cam 12 in the slotted, · ..'-. ■■ ^ hole 9 of the chisel holder 6 and in one of the slots of the cutting chisel 1. In this way, the chisel 1 can be removed from the holder seat 8 in the shortest possible time and V in a working position rotated by 180 ° again in the., »Chisel holder 6. _t . , [^

The basic rhombic shape of the chisel tool according to the invention allows particularly economical mass production of the chisel blanks. The blanks can be made from
a suitable profile bar *?. <ίκί ± -j through one of the sides
length of the rhombus corresponding, and at the distance of this
Side length bevel cut are made,
with the beveled surfaces and recesses for opening
would take the cutting edges and the locking elements beforehand in one continuous operation on the
Profile bar can be generated.

The hot tool holder 6 is expediently produced by |

ΐ First a slot corresponding to the chisel thickness in |

the mounting block 7 milled and then a J

the other side of the wedge-shaped recess 8 forming - is welded% \ steel piece in the slot. jl

Claims (4)

G 70 Π 555.4 27th Hai 1970 UaI. Becker KG claims for protection 1. Reversible, insertable into the mounting seat of a chisel hatcher, symmetrical chisel with several cutting f edges, characterized in that the cutting chisel (1) has a rhombic basic shape and openings (5) for receiving having a locking element (11). 2. Skiving chisel according to claim 1, characterized in that the openings (5) in the skiving chisel (1) are larger than the bore (9) in the Reisseihalter (6) and for receiving a locking cam (12) of a bow spring serving as a locking element (11) are formed. 3. Schrämchisel according to claim 1 or 2, characterized in that it is worn from a free by obliquely to the rod longitudinal axis Rod end cut profile rod piece consists of approximately rectangular cross-section, the length of which is in the longitudinal direction of the rod before the further processing of the Meisseis is equal to the longer diagonal of the rhombus. 4. Holder for a chisel according to one of the claims 1 to 3, characterized in that the mounting block is provided with a milled cut corresponding to the thickness of the Meisseis, into which the second side of the acute-angled Chisel seat forming piece of steel is poured in.