US838469A - Coal-mining machinery. - Google Patents

Description

PATENTED DEC. 11, 1906.

D. V. SIGKMAN. GOAL MINING MACHINERY.

APPLICATION FILED NOV. 23, 1903-.

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D. V. SIGKMAN. GOAL MINING MACHINERY.

APPLICATION FILED NOV. 23, 1903.

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UNITED STATES PATENT OFFICE.

COAL-MINING MACHINERY.

Specification of Letters Patent.

Patented Dec. 1 1, 1906.

1- Application filed November 23,1903. Serial no. 182.307.

To all whom it may concern:

Be it known that I, DAVY VANCE SICKMAN, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Coal-Mining Machinery; I

and 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 appertains to makeand use vide suitable mechanism for engaging andautomatically releasing the ram or piston carrying the pick, whereby to render more effective the motive power in compressing the' ram-driving springs.

Another object of the invention is to so construct and arrange the several parts of the machine that the same may be economically produced and operated and durable and effective in use.

WVith these objects in view my invention consists in the details of construction and combinations of parts hereinafter described and claimed, particular reference being had to the accompanying drawings, in which- Figure 1 is a central longitudinal section, partly in elevation, of my improved. miningmachine. Fig. 2 is a plan, partly in section, of the same. Fig. 3 is a section on line a; m, Fig. 2. Fig. 4 is a sectional view on line y y, Fig. 1, showing in plan the cam-plates for operating the releasing mechanism, the leverrollers being shown in normal positions in full lines and in operative positions in dotted lines. Fig. 5 is a horizontal sectional view taken through the cross-head and ram, the parts being in disengaged position. Fig. 6 is an enlarged sectional view showing the ramdriving springs and the guide-rods for the ram-head. Fig. 7 is a vertical sectional view taken through the cross-head, the ram being in place and the operating-levers being shown in elevation.

The machine is supported from a metal frame comprising castings of definite form having covers to inclose the working parts. As the form of the frame will differ to suit different requirements, no particular descripis, toward the opening 16.

tion of such is necessary herein, it being simplynoted as a frame 1.

An electric motor 2 is suitably mounted at the rear end of the frame, to the armatureshaft of which is fixed a bevel-pinion 3. A bevel-gear 4, centrally fixed on a shaft 5, mounted in bearings 6, rising from frame 1, is suitably driven by pinion 3. The ends of shaft 5 beyond the frame carry spur-pinions 7, arranged to mesh with and drive spurgears 8, fixed on a transverse shaft 9, supported in suitable bearings 10, as shown.

Each of the gears 8 is provided with a crank-pin 11, to which is secured one end of a connecting-rod 12, the opposite end of which is secured to a cross-head 13. The crosshead, preferably in two equal vertical sections'bolted together, is mounted to reciprocate in the main frame between guides 14. The remote face of each cross-head section is provided with'a wrist-pin 15, projecting beyond the frame 1 and receiving the end of the connecting-rod 12. The cross-head is formed with a central longitudinal opening 16 and with horizontally-arranged transverse passages 17, communicatingwith opening 16, a vertical opening 18 extending through the cross-head on each side the opening 16, said vertical openings communicating with the passages 17 as clearly-shown in Fig. 7.

A toothed dog 19 is mounted for movement in each of the passages 17 the teeth of the dogs being on the proximate facesthat Springs 20, seated in recesses 21 in each of the dogs and bear in against the walls of passages 17, tend to hod the dogs normally at the limit of inward movement. 'Levers 22, pivotally supported at their upper ends in ears 23, projecting from each cross-head section, extend downward loosely through the openings 18 of the cross-head, passing through suitable openings 24 in the dogs 19. The lower ends of the levers extend below the cross-head and are provided with rollers '25, as shown.

An auxiliary frame 26 is secured to the main frame 1, being longitudinally slit at its free end, as at 27, a clamping-bolt 28 serving to compress the slitted end when desired. A bushing 29, preferably slitted, is held in the free end of frame 26, the wear inwhich is compensated for by a tightening of the clampingbolt 28. The piston or ram 30 is operative through the bushing 29, extending rearward through opening 16 of the cross-head, being supported in suitable bearings.

Contiguous the bushing 29 the ram is formed with longitudinal grooves 31, arranged to receive projecting ribs 32, formed interiorly of the bushing, with the result to prevent the rotation of j the ram in operation. The ram at its point of passage through the cross-head is provided with toothed segments 35, one at each side of the ram and positioned to be engaged by the dogs 19. The cut of the teeth of the seg ments and dogs is such as to present the effective working plane toward the rear, so that the dogs will engage and hold the segments when the dogs are moving in a rearward direction, but will slip over the teeth of the segj ments without holding engagement when moving in a forward direction. A collar 36 is secured on the ram immediately forward of the segments 35, and encircling the ram and held between the collar and an inward extension 37 of frame 26 is a recoil-spring 38. The

rear end of the. ram is provided with a rec-l tangular head 39, preferably screwed onto a reduced end of the ram. A bearing-head 40 is securely fastened to the main frame directly beneath the motor 2 and in horizontal alinement with the ram-head 39. Guide-rods 41 secured in head 40 and passing loosely through openings 42 in the ram-head, are encircled by springs 43, which latter are compressed between the ram-head and the-bearing-head in the operation of the machineand serve to drive the ram forward to its work.

To operate the releasing mechanismthat I is, to disengage the dogs 19 and segments 35- I provide camlates 44, pivoted to frame 1 at the limit 0 cross-head, each cam-plate serving to operate one of the dogs through the medium of its lever 22. The cam-plates, two innumber, have divergent outer cam edges 45 and contiguous parallel edges 46, between the latter of which a wedge-plate 47 is arranged to enter, with the result to force said edges apart and alter the angle and distance from a fixed point of the outer or cam edge 45 of the plates 44.

wedge-plate is slidingly held to frame 1 by a bolt 48, whereby to adjust the wedge-plate 1tlo T e The hold the cams in a desired position. rear ends of the cam-plates are to be locked in adjusted position by screw-bolts 49, asv seen in Fig. 4. The frame is mounted upon{ wheels 50 and moved by handles 51, pivotally secured to the sides of the frame contiguous the motor 2 and adjustable as to height through a slot 52 and bolt 53, as shown in Fig. 1.

rearward movement of the justment of the cam edges of the cam-plates thro'uglh operation of the wedge-plate 45 permits t e disengagement of the dogs and segments at various points in the travel of the cross-head, as will be evident, thus giving the operator control of the strength of the stroke of the ram, as a quick disengagement of the dogs and segments will of course operate the ram under a less tension of the springs 43 than if the disengagement took place only at the limit of movement of the cross-head. If the machine should be so placed that the operative surface will not receive the full strength of the force of the ram, the recoilspring 38 will receive and absorb the shock, thereby preventing damage or strain to the machine.

In devices of the character heretofore known the operating-springs are compressed by direct movement of cams or cranks, thereby limiting the length of stroke, as a large sweep cam or crank would take up the power of the motor and but little power would be available to compress the springs. A distinction is to be noted in this construction in favor of my device, in that I use the full power of the motor in compressing the springs, dispensing with the use of large cams or cranks. It will be further noted that as the crank connection approaches a line drawn through its axis its throw is gradually diminished, the completion of the compression of the springs being about complete,

giving the crank-arm greater power just as it v is needed. I

The above description and the drawings herewith are illustrative of the preferred embodiment of my invention, and I desire it understood that I consider all mechanical changes and variations as fully within the scope of my invention.

What I claim as new is- 1. In a coal-mining machine, a ram carrying a tool, springs for driving the ram forward, an electric motor,.means continuously operated by the motor in the direction of movement of the ram, and independentlyoperated clutches to engage the ram at diametrically opposite points and moving the ram to compress the springs.

2. In a coal-mining machine, a frame, a motor mounted thereon, a ram carrying a tool, springs for driving the ram, a cross-head reciprocated by the motor, independentlyoperated toothed dogs carried by the crosshead, toothed segments carried by the ram and arranged to be engaged by the dogs to move the ram, levers operable to disengage the dogs and segments, and means to automatically operate the levers.

3. In a coal-mining machine, a frame, a motor mounted thereon, a ram carrying a tool, springs for driving the ram, a cross-head reciprocated by the motor, independentlyoperated toothed dogs carried by the crosshead, toothed segments carried by the ram and arranged to be engaged by the dogs to move the ram, levers connected to the dogs, cams to operate the levers to disengage the dogs and segments, and means for spreading the cams to adjust them,

4, In a coalmining machine, a frame, a motor mounted thereon, a ram carrying a tool, springs for driving the ram, a cross-head reciprocated by the motor, toothed dogs carried by the cross-head, toothed segments carried by the ram and arranged to be engaged by the dogs to move the ram, levers connected to the dogs, cams to operate the levers to disengage the dogs and segments, and a wedge-plate to adjust the cams.

5. In a coal-mining machine, a reciprocating cross-head, a ram movable through the cross-head, means interiorly of the crosshead operative at its forward limit of movement to engage the ram, means to disengage the ram and cross-head at a predetermined point in the rearward movement of the latter, and means to project the ram forward when released from the crosshead.

6. In a coal-mining machine, the combination with a motor, a continuously-operated cross-head connected with and receiving power from the motor, a ram carrying a tool, means connecting the cross-head and ram for moving the latter in one direction, means operated by the ram when the latter is connected to the cross-head for storing the power to drive the tool in reverse direction, and means disconnecting the ram and cross-head.

7. In a coal-mining machine, a ram carrying a tool, means for driving the ram and tool forward, a continuously-operated cross-head having mechanism for engaging the ram when the cross-head is at its forward stroke, the return movement of the cross-heade and ram compressing the means for driving the ram and tool forward, and means disconnecting the rame and cross-head.

8. In a coal-mining machine, a ram carrying a tool, springs for driving the ram forward, a motor, means continuously operated by the motor in the direction of movement of the ram, said means engaging and moving the ram to compress the springs, and means disengaging the continuously-operated means and the ram.

9. In a coal-mining machine, a movable ram carrying a tool, a cross-head continuously reciprocated under power, means connecting the ram and cross-head, automatically-operated means for disengaging the ram and cross-head, and a power-spring placed under tension by the ram when the latter is connected with the cross-head and acting on the ram to drive the latter forward when released from the cross-head.

In testimony whereof I have signed my name to this specification in the presence of v two subscribing witnesses.

DAVY VANCE SICKMAN.

Witnesses:

A. MAEULEN, C. O. PooLE.

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