US578676A - Mechanism for grinding car-wheels - Google Patents

Description

4 Sheets-Sheet 1.

(No Model.)

J MURPHY MBGHANISM POR GRINDING GAB. WHEELS.

Patented Mar. 9,1897.

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(No Model.) 4 Sheets-Sheet 2 J. MURPHY.

MEGHANISM FOR GRINDING GAR WHEELS. No. 578,676. l Patented Mar. 9, 1897.

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4 Sheets-Sheet 3.

J. MURPHY. MEGHANISM POR VGRINDUsG GAR WHEELS. No. 578,676.

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Patented Mar. 9, 1897. F155.' m

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J MURPHY MBGHANISM FOR GRINDING GAR WHEELS.

Patented Mer. 9, 1897.

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JOHN MURPHY, OF PITTSBURG, PENNSYLVANIA.

MECHANISM FOR GRINDING CAR-WHEELS.

SPECIFICATION forming part of Letters Patent No. 578,676, dated March 9, 189'?.

Application filed January 2, 1897.

To LZZ whom, t may concern:

Be it known that I, JOHN MURPHY, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Mechanism for Grinding Car-Wheels,of which improvements the following is a specification.

The invention described herein relates to certain improvements in mechanism for grinding car and locomotive wheels0 without removing the same from the-car orltrju'clis,

It has heretoforeA beenn vatteinptl-dt true car-wheels in position by jacliigup the car, so as to lift the wheels clear of the rails. The

u wheels are then rotated by any suitable means and a rotary grinder is moved against and across the tread of the Wheels. As the axles of the Wheels are loosely mounted in the trucks and as the wheels are very seldom truly balanced, the center of rotation of the wheels will move through a circle of greater or less diameter, dependent upon the speed of rotation of the wheel and its lack of balance.

It will be readily understood from the foregoing that it is practically impossible to true a wheel which is not only free to but actually does move toward and from the grinder.

The object of the present invention is to provide a grinding mechanism constructed to prevent any change or shifting of the center of rotation of the wheel to be trued drng'the grinding operation, thereby insuriigthe production of a wearing-surface which shall be a true circle having its center coincident with the center of rotation of the wheel.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure l is an end elevation of my improved mechanism, showing a car-truck in position for trued. Fig. 2 is a side elevation of the same. Fig. 3 is a top plan view. Fig. 4 is a sectional elevation, the plane of section being indicated by the line IV IV, Fig. 3. Fig. 5 is a top plan view of a modified structure of the grinding mechanism. Fig. 6 is an end view of the same. Fig. 7 is a sectional elevation, the plane of section being indicated bythe line VII VII, Fig. 5. Fig. 8 is a sectional elevation illustrating an arrangement of mechanism for efseriai No. 617,753. oro model.)

fecting the simultaneous adjustment of both of the grinding and centering mechanisms.

In the practice of my invention a bed-plate 1, provided with suitable guideways 2, is arranged on each side of the track, as clearly shown in Fig. 2. On these bed-plates are mounted the head-blocks 3,which are adapted l to be shifted along the ways 2 toward and from the rails by means of levers 4, pivoted to the bed-plates and connected by links 5 to the head-blocks. The head-blocks are provided with internally-threaded sockets 6 for the reception of screws 7, which are provided at their inner ends with centering-pins S. Sliding carriages 9 and 9a are arranged on opposite sides of the head-blocks, said carriages being supported by guideways or ribs 10 on the bed-plate and held in parallelism With-the axes of the centering-pins 8 by means of dovetailed wings ll along one side of the carriages fitting in correspondingly-shaped grooves in the sides of the head-blocks, as clearly shown in Figs. l, 2, and 4. These carriages are moved back and forth along the sides of the head-blocks by means of feed- Screws 12, which are mounted in the headblocks in such manner that, While free to move, they are held as against longitudinal movement. These screws engage threaded openings in lugs 13, formed in the carriages, as shown in Fig. 4. The carriages are provided With suitable slideways I4 at right angles to their direction of movement on the head-blocks for the reception of the slideblocks 15 15, which are provided with suitable bearings 16 for the reception of shafts 17 17, parallel with the axes of the centeringpins 8. Suitable grinding-wheels 18 I8a are secured on the inner ends of the shafts 17 17, which are adapted to be driven by belts passing around pulleys 19, keyed on the shafts 17 17a, or in any other suit-able manner. The blocks l5 15a are shifted in their slides by means of screws 2O engaging threadedl openings in lugs 2Oa on the under sides of the blocks.

In using my im proved mechanism a car is run in along the trackuntil the axis of one of its axles is in the vertical plane passing through the axles of the centering-pins S. The car and truck are nov-1 raised by a jack or other suitable means until the axis of the IOO - arranged outside the wheels.

axle is in the horizontal plane passing through the axes of the centering-pins 8. The lids of the axle are now removed or turned to one side to expose the ends of the axle. The head-blocks are now moved in toward the car, and the conical ends of the centering-pins are forced by the rotation of the screws 7 into the center holes, which are formed in the ends 0f axles when being turned for the reception of the wheels. The engagement of the centering-pins with the holes in the ends of the axle willprevent any change of position of the center of rotation of the wheel, which may be rotated by any suitable means, as, for example, by its motor if it be an electric car, the motors on the other axle being disconnected. One of the carriages, as 9, on each side of the car is moved toward the latter until the grinding-wheels 18 are in line with the car-wheels. The sliding blocks 15 are now shifted by their screws 2O to bring the grinding-wheels in contact with the treads of the wheels. As the wheelis held as against any movement, it renders certain that the surfaces ground will be true circles having their centers coincident with the centers of the axles.

After the wheels A have been ground the carriages 9a are drawn back, the center pins withdrawn, and the head-blocks moved outwardly by their levers. The car is lowered onto the rails and shifted until the axle of wheels B has been brought into the described relation to the center pins. The car is next raised, the head-blocks moved in, the center pins forced into the center holes of the axle, and the grinding-wheels 18 brought into operative relation to the wheels B. It will be observed that the grindin g-wheels operate between the wheels A and B, thereby avoiding the removal of the brake-shoes, life-guards, and other parts of the truck which are usually The grinding mechanism can be used to true wheels having inside shoes; but in such case the grinding-wheel 18 will be used to true the wheels A, and the grinding-wheels 18a in truing wheels B, the grinding-wheels in this operating outside the wheels.

While preferring to use two grindingwheels which operate different wheels, as all delay incident to the removal and replacement of the shoes, it is obvious that a single grinding-wheel having the described relation to each center pin can be used in which the grinding-wheels will operate outside in truing one pair of wheels and inside in truing the other pair; but in such case the brakeshoes of one pair of wheels must be removed.

The removal of the brake-shoes when using a single grinding-wheel on each side can be avoided by using two centering devices on each side, as shown in Figs. 4, 5, and 6. In

this construction two head-blocks 3a and 3b, each provided with movable centering-pins 8a and 8b, are arranged on the slides 2a of the bed-plate 1a. These blocks are shifted back and forth by any suitable means, as, for example, by a handle 21 on the shaft 22, which is mounted in suitable bearings on the bedplate and provided with arms 23, connected by links 24 to the head-blocks. The inner or adjacent sides of the head-blocks are provided with dovetailed grooves for the reception of the correspondingly-shaped wings 25 on the ends of the carriage 26. .This carriage is shifted by means of screws 27 engaging threaded openings in lugs on the ends of the carriage, said screws being mounted with a freedom of rotation, but not of longitudinal movementin thehead-blocks. Bevel-pinions 28 on the outer ends of the screws engage corresponding pinions on the shaft 29, thereby insuring a simultaneous movement of both screws when one is rotated by a hand-wheel 30.

The carriage is provided with suitable slides 31 for the reception of the sliding block 32, which is provided with suitable bearings for the shaft 33, having the grinding-wheel 34: secured thereon.

The block 32 is shifted along the carriage by means of a screw 35, mounted on the carriage'andengaging a threaded opening in the lug 36 on the under side of the block. The screw is rotated by a hand-wheel 37 on the shaft 38, which is provided with a beveled pinion intermeshing with a corresponding pinion on the screw.

The manner of using this form of mechanism will be readily understood from the foregoing description and the description of the operation of the form of mechanism shown in Figs. l, 2, and 3.

As shown in Fig. 8,- both of the head-blocks can be simultaneously adjusted by means of a shaft 35, provided with right and left hand screws 3Ga and 36h, engaging with lugs 37n and 37b, projecting down from the head-blocks through slots 38 in the bed-plates 1. This shaft is supported by suitable bearings 39, depending from the bed-plates and adapted to hold the shaft from longitudinal movement, while permitting rotary movement, which is effected by a hand-wheel 40.

I claim herein as my invention- 1. In a mechanism for grinding car and locomotive wheels while in position under the car or locomotive, the combination of a track adapted for ordinary truck purposes, centering devices arranged in line with each other on opposite sides of the track, and adapted to engage and hold the axles of the wheels as against lateral movements, means for moving the centering devices toward and from each other, grinding-wheels, and means for shifting the positions of the grinding-wheels with relation to the centering devices, said parts being so arranged as to leave an unobstructed track for the movements of the wheels to position to be ground, substantially as set forth.

2. A mechanism for grinding car and locomotive wheels having in combination two head-blocks, means for moving the headblocks toward and from each other, axle-cen- IIO motive Wheels having in combination two head-blocks, means for simultaneously moving the head-blocks toward and from each other, axle-centering devices mounted on the head-blocks, a grinding-wheel mounted on each of the head-blocks and means for shifting the grinding-wheels, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JOHN MURPHY.

Vitnesses:

DARWIN S. WoLoo'rT, M. S. MURPHY.

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