US1088032A - Pick. - Google Patents

Description

M. MADDEN.

PICK.

APPLIGATION FILED DEC. 7, 1912.

Patented Feb. 24, 1914.

WITNESSES ATTORNEY MICHAEL MADDEN, OF WEST FRANKFORT, ILLINOIS.

PICK.

Specification of Letters Patent.

Patented Feb. 24, 191 4;.

Application filed December 7, 1912. Serial No. 735,496.

To all whom it may concern Be it known that I, MICHAEL MADDEN, a citizen of the United States, residing at West Frankfort, in the county of Franklin and State of Illinois, have invented a new and useful Pick, of which the following is a specification.

This invention has reference to improvements in picks designed for use in connection with coal mining machinery, particularly of the type known as punching machines which are used for the purpose of undermining coal..

The present invention has to do with the type of picks in which the active end of the pick terminates in divergent points suitably spaced apart and lying in a plane to one side of the longitudinal axis of the pick, and the present invention is designed to overcome certain objectionable features of such type of pick, such as the liability of the formation of pockets in the cutting operation and the consequent loss of time required for cutting such pockets out.

In accordance with the present invention the pick of the type named is provided at the crotch end of the pick points with a cutter or chisel rising from the crotch at one side of the longitudinal center line of the pick in substantially perpendicular relation thereto and extending to about the plane of the other side of the pick.

The invention will be best understood from a consideration of the following de tailed description, taken in connection with the accompanying drawings forming a part of this specification, with the further understanding that while the drawings show a practical form of the improved pick, the invention is not confined to any exact c011- formity with the showing of the drawings but may be changed and modified so long as such changes and modifications mark no material departure from the salient features of the invention.

In the drawings :Figure l is a view of a pick constructed in accordance with the present invention and also illustrating an extension holder for the pick. Fig. 2 is a section on the line 22 of Fig. l but drawn to a larger scale. Fig. 3 is a perspective view of the improved pick.

Referring to the drawings, there is shown a pick comprising a shank 1 expanded at one end into two pick points 22, the active ends of which may be more separated than any other part of the tool, and the active ends of the points may be in a plane corresponding to one face of the tool. These points gradually approach until they join in approximately the plane of the points in a crotch 3, while the points thicken toward the other face of the tool in the form of ridges 4: slowly approaching and merging into the shank portion of the tool at some distance back of the crotch 3. The face of the tool with which the active ends of the points 2 are substantially coincident, may be practically plane, as indicated at 5 in Fig. 2, while the opposite face of the tool may be rounded as indicated at 6 in Fig. 2, and projecting into the space between the ridges 4: where they merge into the face 6 of the tool is a tongue 7 having its upper edge or face in substantially the plane of the corresponding portion of the face 6 of the tool and continuin g to the crotch 8, the tongue 7 being at the same time narrowed until it forms a chisel edge 8 substantially perpendicular to the face 5 of the tool, and rising to the full height of the tongue 7.

Vith such a pick it is almost impossible to produce pockets in the cutting as the chisel edge 8 of the tongue 7 and constituting what may be termed the chisel point of the pick, cuts out what the points 2 of the pick fail to cut, so that the improved pick clears the way as it progresses and the only manner in which pockets could be produced by the pick of the present invention is where the machine runner purposely operates the machine to such an end.

Experience has shown that with the pick of the present invention more work is possible than with a pick where the chisel point 8 is omitted. It has also been found in actual experience that the chisel point" or bit located on the ick at about the crotch of the main points w1ll operate in hard coal to undermine it with a less number of picks for a certain amount of coal than can be undermined with the prevailing type of picks under the same conditions. Furthermore, extended experience is not necessary for the use of the picks of the present invention as is required for the use of the prevailing type of picks, for the improved pick cuts the coal from the time it strikes it.

There is an operation in coal mining called shearing the coal which has reference substantially perpendicular to the plane of the picking points With that end of the cutting edge remote from the crotch extending 15 to the side of the pick remote from the plane of the cutting points and there free.

In testimony, that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

MICHAEL MADDEN. Vitnesses J. T. HARRIS, EVAN PRICE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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