US1995235A - Cutting bit for mining machines - Google Patents

Description

March 19, 1935. J. H. WENZLICK 1,995,235

CUTTING BIT FOR MINING MACHINES Original Filed July 18, 1952 Patented Mar. 19, 1935 7 1,995,235 CUTTING BIT Foa MINING MACHINES John H. Wenzlick, Wheeling, W; Va., assignor to Warwood'Tool Company, Wheeling, W. Va., a ccrporationof West Virginia Original application July 18,v 1932, Serial N0. 1

Divided and this application September 21, 1933, Serial No. 690,481

' 1 Claim.

The invention relates to new and useful improvements in cutting bits for mining machines.

An object of the invention is to provide a cutting bit for mining machines wherein the grain of the stock in the finished bit is in layers parallel with the cutting face of the bit so as to prevent splitting of the metal under cutting strains thereon.

A further object of the invention is to provide mining bits of the above character which are joinedin pairs by an integral web of metal that is readily fracturable when it is desired to put the bit in use and wherein the connecting web of metal is the resultant action of the forming and shaping of the cutting ends of the bits. I

In the drawing, which shows by way of illustration one embodiment of the invention,

Figure l is a side view of a mining bit embodying the improvements and showing in broken lines the grain of the metal forming the bit. a

Figure 2 is a perspective view of the finished mining bit.

Figure 3 is a sectional view in line 33 of Fig. 2. V

Figure 4 is a section of bar stock from which a pair of mining bits are made embodying the improvements.

Figure 5 shows the first step in bending the metal so as to provide inclined cutting faces of the bits with the grain of the metal parallel therewith.

Figure 6 is a view showing the blank after the cutting ends of the bits have been shaped by swaging action thereon.

Figure '7 is a plan view of the same. i

The construction of the mining bit embodying my improvements will probably be better understood bythe method of making the same. The bit for mining machines embodying the improvements consists of a shank or body portion 1 which is longitudinal in cross-section. Said'body portion is offset so as to provide a connecting end 2 having a lip face 3 leading to a cutting point 4. This lip face 3 inclines upwardly and away from the upper edge face 5 of the body portion. The cutting end of the bit is also provided with a clearance face 6 leading from the point 4 to the under edge face .7 of the body portion. This clearance face 6 inclines inwardly away from the cutting point so that the cutting point 4 overhangs said clearance space 6. The grain of the metal forming my improved mining bit is parallel with the edge portions 5 and '7 of the shankor body portion of the bit. It is also parallel with the inclined lip face 3 of the bit. The grain of the metal is indicated by the broken lines in Fig.

l. The lip face 3 of the cutting bit is preferably Artur bit will be better understood by a description of f In Fig. 4 of the drawing, there is shown'a, section of bar'stock at 9 which is rectangular in cross-section. This bar stock is of suitable steel for producing a cutting tool which may be used for cutting clay, coal, stone and the like. The bar stock is subjected to die pressure for offsetting the section 9a relative to the section 911. Intermediate these sections the metal is bodily displaced without disturbing the grain of the metal. In other words, the grain of the metal is substantially parallel with the line .r-a: of Fig. 5

which lies parallel to the upper and lower faces of the bar stock after it has been offset to provide the connecting portion 90. This central section 9c is utilized for forming the cutting ends of two bits which are in reverse position so that the one edge portion of this intermediate section will form the cutting lip face of one bit, while the other edge portion of this intermediate section will form the cutting lip face of the other bit. The blank is then subjectedto die pressure for shaping the. side faces of thecutting ends of the two bits and also for shaping, if desired, the lip faces of the two bits so that they will be substantially flat although inclined relative tothe edge face of the body portion into which these lip faces merge. During this shaping of the two bit faces by die pressure, the metal is reduced to a thin web along the line yy. (Fig. 6). This connecting web is indicated at 10 in the drawing. The two bits are in finished condition so that if the metal be fractured along this line y-y, or at this thin web '10, then-the two bits will be 'in' finished. condition ready 'foruse. v

It is noted that when one section of the bar stock is offset relative to the other, so as to be shaped into said cutting ends.

ting bit. Applicant has also produced a new 'article in the two bits which are joinedtogether by a thin Web of metal along their clearance faces, which web can be readily ruptured so as to render the same. ready for use. The connecting web is an incident in themethod of making the bits and it serves as a bond for the two bits so that they may be handled and stored as a unit in pairs.

The method of forming the bits as described above is described in greater detail and claimed in my copending application Serial No. 623,211, filed July 18, 1932, and of which application this present application is a division.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

As an article of manufacture, a coal mining machine cutting bit comprising a single homogeneous piece of metal providing a shankterminating in a cutting end ofiset from the shank to provide a cutting lip face inclining upwardly away from the upper longitudinal face of the shank, and wherein the grain of the metal in said cutting end is parallel to said inclined face, said cutting end having an inclined clearance face extending inwardly from the cutting point of the lip face to the lowerlongitudinal face of the body portion.

JOHN H. WENZLICIL' 20

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