US502426A

US502426A - Coal-mining machine

Info

Publication number: US502426A
Authority: US
Publication date: 1893-08-01
Anticipated expiration: 1910-08-01

Description

(No Model.)

B. F. WILSON. COAL MINING MACHINE.

Patented Aug. I

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UNITED STATES PATENT OFFICE.

BENJAMIN F. WVILSON, OF PITTSBURG, PENNSYLVANIA.

COAL-MINING MACHINE.

SPECIFICATION forming part of Letters Patent No. 502,426, dated August 1, 1893.

Application filed August 30, 1892. Serial No. 444,567. (No model.)

To a/ZZ whom t may concern.-

Be it known that I, BENJAMIN F. WILSON, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Coal Mining Machines; and4 I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to an improved coal mining machine and consists in certain details of construction, and combination of parts as will be fully described hereinafter.

In the accompanying drawings, Figure 1 is a plan view of myimproved mining machine, having a portion of the top removed the better to show the lower working parts. Fig. 2 is a sectional side elevation of the same, and Fig. 3 is afragmentary face View of the driving mechanism.

To put my invention into practice, I provide a frame 1, and mount in suitable bearings 3, a threaded shaft 2 which extends the entire length of the said frame. Operating on the top of this frame 1, and capable of Inoving in the direction of the length of the same is a carriage 23, having mounted therein a threaded shaft 17, arranged at right angles to the shaft 2 of the other frame. Attached to one end of this shaft 17, is a cross-head 8, mounted on slides 9 attached to the carriage 23. Secured to a downward extension of this cross-head is an arm 18, having a socket in which a cutting tool 19 is attached. This threaded shaft passes through a stationary nut 10, formed on the carriage, and through a sleeve 11, on which a loose toothed wheel13 is mounted. This wheel 13, has a clutch formed on one side of the hub which is adapted to engage with a fixed clutch l2, operated by a hand-lever 27. This clutch may be also engaged with a large gear Wheel 15, mounted on a feather in a manner that will permit the shaft 17 to move freely through the said wheel. Meshing with this gear Wheel 15 is a pinion 16 mounted on a shaft attached to an extension 23X of the frame of the carriage 23. This pinion 16 is operated by

sprocket wheels

25, and 26 connected to a motor 24, mounted on the top of the carriage 23. The toothed wheel 13 being loose meshes with another toothed wheel 14 of the same size connected to the same shaft as the sprocket wheel 2G, and the said wheels 13-14, serve to operate the screw shaft in an opposite direction to the motion given the same when connected by the clutch 12, to the large gear wheel 15, which is also loosely collar-ed on screw 17 and pinion 16 on the counter-shaft. Operating on the threaded shaft 2, which remains stationary, is a ratchet wheel 4 adapted to be slightly rotated at every backward movement of the crosshead S. This rotation of the ratchet 4 is accomplished by means of a pawl 5, pivoted to a weighted lever 6, coming in contact with an inclined surface 7, attached to the cross-head 8.

The cutting tool 19 having a chisel point is moved backward by throwing the clutch in gear with the wheel 13, which rotates the same to operate the screw shaft 17. A small hole which will permit the cutting tool 19 to enter, is first drilled in the coal, at the left hand end of the room, and at a point close to the floor. This hole will give the cutting tool a starting place, and by engaging the clutch 12, with the gear wheel 15 the said tool cuts a thin strip from the edge of the said hole, and when entered the full depth of the same the clutch is shifted to engage with the reversing gearing 13--14. On the backward movement of the cross head 8 the lever 6 engages with the inclined surface 7; elevating the said lever, which operates the pawl 5, and wheel 4 to move the carriage slightly forward to cut another thin strip from the side of the opening, and the operation as described continued until the coal is undermined across the entire room.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The herein described coal mining machine, consisting of the frame 1, the threaded shaft 2 mounted thereon, the carriage 23, operating along said frame, the shaft 17 having athreaded portion and attached to the cross-head 8, the gearing 15--16 for operating said shaft to drive the tool forward, the gearing 13-14 to reverse the movement of the said shaft 17,

IOO

the clutch 12 to engage with the hubs of said hereunto affix my signature this 27th day of gearing, a motor 24 mounted ou the top of August, A. D. 1892. the carriage and means substantially as del scribed for feeding the carriage evenly along BENJAMIN F' WILSON' [L' S'] 5 the frame, all arranged for service substan- In presence 0ftially as set forth. JOHN S. KENNEDY,

In testimony that I claim the foregoing I M. E. HARRISON.