US114670A - Improvement in railroad-car-axle lathes - Google Patents

Description

2 Sheets--Sheet L GEORGE A. GRAY, Jr Improvement in Railroad Car-Axle Lathes. No. 114,670.

Patented May 9,1871.

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wmmu/ GEORGE A. GRAY, Jr. Improvement in Railroad Car-Axle Lathes. No. 114,670, Patented May 9,1871.

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GEORGE A. GRAY, JR., OF CINCINNATI, OHIO.

Letters Patent at. 114,670, dated May 9,1871.

IMPROVEMENT m RAlLR OAD-CAR-AX LE LAT HEs.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern: I

Be it known that I, Gnoaen A. GRAY, Jr., of Cincinnati, Hamilton county, State of Ohio, have invented certain new and useful Improvements in Lathes for Turning Railroad-Oar Axles; and I hereby declare the following to be a full, clear and exact description thereof, reference being bad to the accompanying drawing making part of this specification.

Nature and Objects of Invention.

My invention relates to the form of axle-lathe having a dead center at each end, the axle being revolved by direct connection with the driving mechan ism; and

It consists- First,.in a peculiardevice for so governing and op- Description of the Accompanying Drawing.

Figure 1 is a side elevation of an axle-lathe embodying my-invention.

Figure 2 is an' end view of the same. Figure 3 is an axial section through the drivinghead, which surrounds the axle.

Figure 4 is a perspective view of the driving-dog.

Figure 5 is a plan of the lathe-shears and carriage, showing the device for operating the tool-rest.

Figure 6 is across-section of a portion of the shears, showing how the device which operates the tool-rest is connected with the shears. Figure 7 is a perspective view of the tool-stock, showing the mannerof connecting the pad thereto.

General Description.

The lathe-bed A is fitted with two sliding blocks, B B, which carry the dead centers 0 0', upon which 4 the axle D revolves.

This hollow shaft or box J is constructed with a spur-gear wheel, K, outside of thejournal.

Upon the face of this wheel a plate, L, is fitted, which forms a part of the driving-dog, the other part, M, being secured, as shown, to the axle.

Pins or studs, N, project from the plate to form a driving connection with the arms m m of the dog M.

The plate L is constructed with slotted or elongated holes, P, through which the bolts Q pass, which secure the plate to the shaft J.

The bolts Q are shouldered bolts, as shown in dotted lines in fig. 3, in order that they may be screwed home without bringing the heads q too close to permit the free oscillation of the plate L in the slots P.

The oscillation of the plate L in the; slots Pin the operation of the lathe serves to enable the studs or pins N to press with equal force upon the arms m m, no matter how the part M may be adjusted upon the axle, and to compensate, by sliding backward and for-- ward, inturning round for any inaccuracies in the adjustment of theceuter of the shaft J with relation to the centers 0 O of the lathe.

Thus it will be seen that the axle cannot be sprung out of line by one-sided pressureupon the dog M at any point in the revolution of the axle or lathe.

The axle is driven by pinion It and shaft S, the latter being journaled in the support I and driven by suitable connections from cone belt-pulley T.

At the back of the lathe-bed, near each end, a plate,

U, is secured, which, except for a short distance, is

parallel with the bed, the exception being a'beveled or tapering portion, which is located immediately opposite to the part of 'the axle which is required to be turned tapering for the reception of the car-wheel.

In the drawing the degree of taper, both on the plates U and the axle, is greatly exaggerated, in order that it may be clearly exhibited. The degree of ta'per necessary in practice is so slight as to show in a drawing a scarcely-perceptible divergence from a straight line.

A metallic pad, V, rests against each plate U, which connects with the tool-rests F and F by means of side rods W, cross-head X, and central screw Z.

The pad V is forced against the plate U so as to compel the pad to follow the configuration of the plate U by means of coiled springs a a on the side rods W.

In the operation of the lathe, as the carriages E E are moved longitudinally the tool-rests F F are adjusted for the straight and tapering portions automatically by the device described, and it is simply necessary, in the turning of the axle, to move the rests F F in and out by means of the screws Z and handles b for the difi erent diameters.

The carriages E E are detachably connected to the lead=screw by means of the customary sliding halfnuts operated by clutch-plates G.

As it is necessary that one workman alone should operate the lathe at both ends, it may be necessary (until the operator is sufliciently skilled in starting one out behind the other in time and stopping on time) to attach projections to the lathe which are stationary and adjustable, against which the clutches G strike in such a manner as to open the nuts and thus prevent damage to the lathe by accidenta overrunning.

Claims.

1. In the described combination with the sliding tool-

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