US574402A - Dorff - Google Patents

Description

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H. B. DIERDORFP.

MINING MAGHINB. No. 574,402. Patented Jan. 5, 1897.

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'- H. B. DIBRDORFF.

MINING MAGHINE; l

No. 574,402. Patented Jan. 5, 1.897.

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UNITED STATES vPATENT OFFICE.

'HENRY B. DIERDORFF, OF COLUMBUS, OHIO, ASSIGNOR TO JOSEPH A. JEFFREY, OF SAME PLACE.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 574,402, dated January 5, 1897.

Application filed March 8, 1892. Serial No. 424,153. (No model.)

To all whom it muy concern:

Be it known that I, lHENRY BEECHERDIER- DORFF, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain newand useful Improvements in Mining-Machines, of which the following is a specificatiomreference being had therein to the accompanying drawings.

Figure l is a plan view of a machine embodying my improvements. Fig. 2 is a longitudinal section on the line az' as', Fig. 1 Fig. 3 is a View, partly in rear elevation and partly in cross-section, on the line fy'y, Fig. 1. Figs. 4 and 5 are similar sections of the modified form of the machine.

The object of this invention is to provide an improvement in machines for mining coal wherein use is made of a bed, a carriage moving to and fro onr the bed, a cutting apparatus on the carriage, and shafting and gearing on the carriage for actuating the cutting mechanism and for moving the carriage. Considerable trouble and inconvenience have been experienced in moving the carriages of these machines, particularly in receding the cutter and the carriage after a cut has been made, the mechanism for this being ordinarily called the pull-back.

Prior to my invention use had been made of an intermittingly-acting mechanism as a pull-back, comprising a ratchet and dog actuated by an eccentric and connecting-rod, as is shown in Patent No. 299,655 to B. A. Legg, dated June 3, 1884, and use had also been made of sprocket-Wheels and a chain, as is also shown and described in the said patent, and, again, use has been made of a train of gear-Wheels extending back from the intermediate shaft to the carriage-moving shaft. Serious objections were found to be incident to each of these constructions, the ratchetand-dog mechanism having arr intermittent jerking action, the chain-and-sprocket mechanism acting too rapidly, it not being practical :in these machines as ordinarily made to get the room for a large sprocket-wheel Wherewith to properly reduce the speed, and the train of gear-wheels being liable to clog or choke With slack and occupying considerable of the restricted room.

One of the objects of the presentinvention is to provide a con tinnously-moving pull-back mechanism in conjunction with a continuously-moving advancing mechanism, which pull-back mechanism shall comprise parts 0f such nature and so related to the other parts that any desired speed can be obtained in receding the carriage without multiplying the number of the parts to such an extent as to seriously take up the limited space which is available.

The invention also relates to other matters of construction and arrangement, which will be readily understood from the drawings and the description given below.

The invention is applicable to machines of any of the numerous sorts, although particularly so to one of the class illustrated in the said Patent No. 299,655, to which reference is herein made, and having selected one of that class for purposes of illustration it is not necessary to here give a detailed description of the machine as a Whole, but I will mention a number of them, so that the essential parts of thepresent invention will be clearly understood.

A A represent the side bars of the bed; B B, the sliding side bars of the carriage fitted to the bed 5 B' B', the carriage-plate fitted to bars B B; O C, the engines; D D, the engine plates or supports; E, the crank-shaft; F, the intermediate shaft; G, the rear chainshaft, shafts E F G being geared together in the usual way; G', the cutter-bar, connected by chains to shaft G; H, the rear transverse carriage-moving shaft, having pinions fitted in the rack H'; J, the longitudinally-arranged carriage-advancing shaft, having the wormwheelj engaging With worm j' on intermediate shaft F and having worm L at its rear end engaging with worin-Wheel N, loose on shaft H, and N', a clutch splined to shaft H and adapted to engage with Worm-wheel N.

Referring to Figs. l, 2, and 3, the improved mechanism for withdrawing or pulling vback the carriage is shown as being constructed and arranged as follows: Upon the shaft J and at a short distance from the Worm thereon is a bevel-wheel p', which meshes with a bevelwheel p, keyed upon the end 0f a shaft P, which is mounted in bearings and arranged parallel to the transverse carriage -moving shaft H. Upon the said carriage-moving shaft H is a straight spur-wheel Q, loose thereon and continuously rotated by a similar wheel P, fast upon the said shaft P. Although the said wheel Q is loose upon the shaft I-I, yet it is adapted to be rigidly connected thereto by the clutch N. Then the clutch is in engagement with the wheel N, the carriage advances slowly, and when it is in engagement with the wheel Q the carriage is moved in the opposite direction at a higher speed, proportional to the relative sizes of the wheels p, p, P, and Q. By varying the relative dimensions of any of these wheels any necessary variations in the speed in this pull-back mechanism can be attained, such variation being necessary in order to properly work upon different materials. By taking the power from the bevel-wheel p' on the lower end of shaft J the pull-back mechanism is arranged low down and its parts are compact and take but little room. It is continuously in operation, and I therefore avoid the serious trouble met with in using an intermittingly-acting mechanism, such as a ratchet and pawl. Prolonged and extensive experience has demonstrated that machines of this class must have their parts arranged within restricted limits in' order that the machine may be easily portable, the power properly applied to the cutters, the parts be of small number, and the energy of the engines economically transmitted. Thus the wheels at N and Q cannot well be over a foot in diameter or thereabout. The wheel N should make anywhere from one to three revolutions while the crank-shaft is making six hundred to one thousand and the intermediate shaft from three hundred to fivehundred, the shaft J revolving at about the rate of thirty revolutions a minute. Then the wheel Q in the pull-back should at the same time make from eight to ten revolutions a minute. .As the chain-shaft makes from one hundred and fifty to two hundred and fifty revolutions a minute and the wheel Q being of such small diameter, the difficulty in reducing the speed by such devices by a chain and sprocket-wheels will be readily appreciated, it being remembered that the shaft G is the slowest of t-he three power-shafts, revolving from seven to ten times as fast as the shaft H should revolve, the shaft F revolving from fteen to twenty times as fast; hence the employment of the bevel-gearing actuated by the shaft J and suitable gearing driven thereby and actuating thc carriage-moving shaft, the latter being of great importance in these machines.

In Figs. 7 and S is shown a modification in which use is made of a chain and sprocketwheel instead of the spur-gearings Pl Q, there being incident to such an arrangement many of the advantages incident to that in Figs. 2 and 3.

The positions of the bevel-gearing, or the directions of the threads atjj, will of course be properly related to get the right direction of rotation of the sprocket-wheels and thc shaft H.

lfVhat I claim isl. In a mining-machine the combination with the stationary frame and the sliding frame, of the transverse carriage-moving shaf t II, the relatively fast-moving power-shaft, the intermediate shaft, the carriage-advancing mechanism consisting of the shaft J, the worm-wheel thereon engaging with a worm on the intermediate shaft, a worm-wheel on the carriage-moving shaft and a worm on said shaft J for driving it, and the carriage-withdrawing mechanismhaving the continuouslyrotating pinion-Wheel on said shaft H, a shaft P having a bevel-wheel driven by a bevelwheel on the shaft J, and gearing connecting said shaftP with the wheel Q, substantially as set forth.

2. In a mining-machine, the combination with a stationary bed-frame and the sliding frame, of the power-shaft, the intermediate shaft, and the reversible double-speeded carriage-moving shaft, the carriage-advancing mechanism having the shaft J driven by the intermediate shaft and having a worm driving a worin-wheel on the carriage-moving shaft, and the carriage-withdrawing mechanism consisting of a shaft parallel with the carriage-moving shaft geared to the said shaft J, and the straight spur-gearing connecting said shaft J with the carriage-moving shaft, substantially as set forth.

3. The combination with astationary frame provided with a rack and a sliding frame provided with a pinion to engage said rack, of a shaft H, a worm-wheel thereon, a shaft J provided with a worm for driving said wheel, a wheel Q on said shaft H, a shaft P parallel with said shaft H and having a bevel-wheel 29 driven by a bevel-wheel p on shaft J and gearing connecting said shaft P with said wheel Q, substantially as set forth.

4. The combination of the bed,the carriage, the chain-actuated cutting apparatus on the carriage, the prime power-shaft, the secondary shaft driven thereby, the chain-driving wheel connected to the chain-driving shaft, a transversely-mounted reversible shaft having pinions engaging with racks on the bed, a carriage-moving shaft, P, parallel to the pinion-shaft, a worm on the secondary shaft, a worm-wheel driven thereby, a relatively slow-moving gearing actuated by said wormwheel for turning the reversible shaft slowly in one direction, means for connecting the worm-wheel to the carriage-moving shaft, P, the relatively faster straight spur-gearin g connecting said carriage-moving shaft with the pinion-shaft, and the clutch, substantially as set forth.

5. The combination of the bed,the carriage, the chain-actuated cutting apparatus on the carriage, the prime power-shaft, the reversible double-speeded carriage-moving shaft mounted transversely on the carriage, the pinions thereon, the racks on the bed, the

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shaft slowly in one direeti on or rapidly in the ro opposite direction, substantially as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

HENRY B. DIERDORFF.

lVitnesses:

A. RUPPERSBERG, W. E. RICH.

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