US1928145A - Grinding machine - Google Patents

Description

Sept. 26, 1933. H. G. WEINLAND GRINDING MACHINE Filed Dc.

INVENTOR ATTORNEYS 6 Sheets-Sheet 1 UM'WM 77mm M Sept. 26, 1933.

H. G. WEINLAND GRINDING MACHINE Filed Dec. 28', 1931 33 3 1 74/4 *f fi 6 Sheets-Sheet 5 INVENTOR ATTORNEYS se t, 26, 1933.

H. G. WEINLAND GRINDING MACHINE Filed Dec. 28, 1931 6 Sheets-Sheet 4 I HIIHIIIH unhm h I I l Ann INVENTOR ATTORNEYS H. G. WEiNL'AND GRINDING KACHHIE Sept. 26, 1933.

INVENTOR 6 Sheets-Sheet 5 Filed Bee, 23,

ATTORNEYS Sept. 26, 1933. H. G. WEINLAND GRINDING MACHINE Filed Dec. 28, 1931 6 Sheets-Sheet 6 ATTORNEYS g F. a w c Patented Sept. 26, 1933 UNITEDi S TATE S v Gamma MACHI E i p p Hermon G. Weinland, Springfield, Ohio, assignon to The Safety Grinding Wheel & Machine Company, Springfield, Ohio, a corporation Ohio.

. Application December 28; 1931 f L Serial No. 583,473 I 21 Claims. (Cl. 51 178) This invention relates to grindingmachines, particularly machines of the type in which the grinding element moves over the work, it more especially relating to improvements upon the.

and grinding wheel in. elevated position after such partshave been elevated due to an undue obstruction or conditionin the work.

Another object of the inventionis to provide .a simple and effective arrangement for connecting two grinding units in (pairs toform a struc ture which will independently operate .upon the two sides of a railway track. A further objectof the invention is toprovide improved means for connecting a plurality'of such pairs of grinding units in a series.

Other objects of the invention will appear from the accompanying description.

In the accompanying drawings: a

Fig. 1 is a side elevation of one unit of the improved rail grinding machine in which the principles of my invention, and the inventions referred to as well, are shownembodied.

Fig. 2 is a top plan view of the unit shown in Fig. 1.

' Fig. 3 is a diagrammatic illustration of a plurality of units made into a train and drawn by a tractor car.

Fig. 4 is a longitudinal section on the line 44 of Fig. 2 for the purposeof more clearly showing the manner of employment ofelevating and lowering mechanism. v

Fig. 5 is a fragmentary view similar to Fig. 4, ofparts employed in the-elevating devices in the forward portion of a unit, showing a different working arrangement thereof.

Fig. 6 is a fragmentary end view of one of the 5 plurality ofunitary structures employed in the ,Fig. 8 is a fragmentary horizontal section on:

the line 8-8 of Fig. 7.

.metal to be removed may at times be toojlarge Fig. 9 is a fragmentary .verticalsection onthe line 99 of Fig. 7.

Fig. 10 is a; fragmentary on the 1ine 10-- 10 of Fig. 2. k

Fig. ;11 is a fragmentary view similar to Fig; 10 buthwith the parts in different working position. Fig. 12'is a fragmentary horizontal section-on the line 12-12 of Fig. 1.0. p g V Fig. 13 is ,an enlarged fragmentary vertical section on the line l313'- of Fig. 11. 7

, Fig. 141isa fragmentary planfview of the parts as seen from the line 1414 in Fig. 1.

The train of grinding machines constructed according to the principles-as disclosed in the fol lowing specifications andv having incorporated therewith the, elements of the Lanyon and Goering inventions referredto, is particularly adapt-- v ed to thepartial or complete removaljof the longitudinal section track-rail surface defects known as corrugations; which were fully discussed in the Goering application, not. only as to their prevalence,;but their effect as well. v

In the present invention, the grinding-wheel is moved overthe work and preferably-in the .direction in which the most efiicient grinding operaticn is obtained,i. e.,; the direction of rotation of the contact side ofthe wheel is in the same direction as is themovement of the wheel over the i work beingground. Since the total amount of for removal during a single passage of'the wheel, I prefer to employ a series of wheels operating in sequence, each wheel removing only a compara tively smallportion of the total amo unt, whereby the same-result is obtained as when a single Wheel is successively moved to-and-fro over the work, but with the elimination of those passages during which an inefficient grindingoperation is taking place. I v r p Therefore, better results are obtained by ,collecting into a train, a plurality of grinding units allowing the efficient grinding of each rail of a. track simultaneously. The work required of an individual wheel is small, being limited to the mere furthering of the work of a preceding wheel, whereby when .an ample number of wheels is so employed, the track surface is often materially improved by a single passage of the train. This is advantageous, as corrugations are more prevalent in heavily traveled surface street car-lines on which the time allowable for the grindingoperation is necessarily limited. v

A secondary function of the machine is that of grinding rail joints, or a portion of the rail surface that has been built up, as by the common welding process. These are grinding operations of a local character, there seldom being more than five or six feet of surface involved, as compared reciprocation in order to provide that the grinding is done under the more eflicient circumstance.

This is especially true when grinding rail joints as these are invariably staggered with respect to each other. Reciprocation of an individual wheel may be accomplished by reversals of the tractor car either coupled to a single unit or to the train, the latter arrangement being preferred, as the power required to manipulate the entire train is comparatively low. Necessary suitable manual adjustments of the wheel in order to provide increasing depths of cut are made during this type oi -grinding operation. Y

Referringto the drawings, 1 represents'a tractor c'a'r which may be provided with'the usual trolley construction, motors, air compressor, aircontrol apparatus, none of which is shown in the present case; 2 represents the rails. of the track overwhich it operates; and 3, right-and left hand units of a plurality of grinding machines arranged in pairs (Fig. 3). The right and left hand units 3 ofeach pair are connected to each other by a connector casting 4 adapted topermit the elevation orflowering of any unit 3 without interfering with the mating unit, a more complete description ofwhich is to follow.

In Fig. 3 the for-ward units of the train are shown coupled to the tractor-car by a link 5 having a pivotalconnection with a horizontally disposed yoke 6, each end of which is connected to one of the forward pairof units 3 by any suitable universal connection, preferably of the ball and socket typeeach end of the yoke having a ball 6' fitted in a socketed member 6 secured to the frame of the unit.- The succeeding grinding machines in the train are similarly constructedand each is also provided with a yoke 6, coupling being effected by means of a reach-rod 7 pivotally connected to a forward central portion of a rear yoke to the rear central portion of the yoke in advance. Between each of'the right, and each of the left hand units, a large coiledvspring 8 is interposed, the purpose of which is to provide a tightly coupled train,- an explanation of the advantage of which follows. Each springis placed about a short rod 8- (Fig; 2-) the ends-of which are loosely inserted through the end frame members of adjacent units and held in position by cot ter pins. p

Lost motion between the units is eliminated by the use of the coiled springs between the various units. When the train is in the coupled'relation, these coiled springs are interposed between the units in a comparatively highly compressed state, and anyshock incident to quick stoppage or unevenness of draw-bar pull isabsorbed or dampened'out, since in a train thus tightly coupled, vibrations set up at any particular point are quickly dampened out dueto the inertia of the remainder of thetrain.

By thiscoupling arrangement, no interference withan-eflicient-grindingoperation is offered by any variations in the track curvature or profile,

and as the frames are comparatively short, the inevitable lztteral shift of the grinding wheels when the machines are negotiating curves is re-' duced" to a minimum. Another advantage ob-' tained by the use of this coupling method is that of providing that each grinding unit is free to rise or fall independently of the coupling arrangement, and since the connections of the yokes 6 with the frames is comparatively closely adjacent the level of the mounting of the forward axle, the tendency to elevate the rearward portion of the frame by draw-bar pull is minimized.

These grinding machines preferably receive the current for the motors which drive the grinding wheel spindles from the power car 1 by electric cables (not shown) and also receive compressed air which is employed for various functions on the individual units in a'manner which will be described later whereby the power car operator is enabled to have a major portion of the control of the train. Other details of the work may be assigned to attendants who walk along the train v for close inspection of the work.

A description of an individual unit will now be taken up, it being understood that themating unit is exactly identical but of opposite hand con struction. The abrasive wheel is indicated at W. This is mounted on one end of a horizontally disposed spindle 9 rotatably carried in bearings in a bracket 10 secured to the under sides of I-beam members -11 which are-in turn secured to the members 12 of the frame. The frame is a boxlike structure composed of variously formed structural steel members such as angles, chan-' nels and I-beams according to the selection of the designer, and the frame will beindicated'hera.

after in general as 13; On. the inner end of the spindle 9 is a pulley 14, in the present case it being a grooved pulley in connection with which a plurality of small endless V-belts are employed and indicated conventionally only as at 15 in several of the views. In alignment with this pulley 14 is a driving pulley 16 mounted on one end of a shaft 17 of an electric motor-l8 which is suitably supported on the upper surface of the frame 13 so that a major portion of its weight is directly over the rail 2 whereby a better balance of the machine is secured. v

On the vertical side 13 of the frame 13 (Fig. 6)

adjacent the track center is mounted one side of a connector casting 4 previously mentioned and to.

-' length of the axles, the unitary structure comprisinga pair .of units 3 and a connector 4 may be varied to suit different track gauges. Preferably, although not shown in the present application, a runway is secured to the connector members 4 forv the purpose of allowing attendants to walk along the train.

The flanged wheels 19 are utilized primarily for transportation to the point at which the grinding operations are to be performed, a secondary function being to guide the machines during the grinding operation, the grinding wheel W being necessarily positioned in alignment with the-track wheels 19. The elevation and lowering of the machine for transport or grinding positions is secured by the use of lever arrangements located in the forward and rear portions of the frame in connection with compressed air cylinders mounted within the frames. The axles-Zl'and 22 are spring-leaf for a purpose to be described later.

7 1,928,145 front and rear axles respectively, these being deadaxles in thesense that the flanged wheels'19 are revolubly mounted thereon in place of provision of rotation of the axles. These axles extend from side to side of the unitary structure comprising a grinding machine as suggested in Fig.6 and on them at their central portions rests the connector member 4; Fig. l '7 there being semi-cylindrical grooved extending hubs 23 in both forward and rearward extremities of this connector adapted to The lever is loosely mounted on a pin 2'7 horizontally supported in a casting 28 which is secured to thechannel member 29 of the frame 13.

At. 30 is shown an inverted channel. member. secured to the under sides of the upper frame members. On the upper surface of s the member is fixed a casting 31 having a forwardly vertically disposed projecting ear 32. A pivot pin 33 r is inserted in this ear and pivotally supports by the rearwardly extending parallel ears 34, a comparatively short air cylinder 35. The piston (not shown) of this air cylinder 35 is connected to the piston rod 36 which terminates at its outer end in the forked end 37. which straddles the upper end of the arm 26 and is pivotallyzconnected therewith by a cross pin 38 passing "mough the eyeof the arm 26. Therefore, if compressed air is admitted to the air cylinder 35 to the rearwardside of the piston, the arm 26 will be caused to move forwardly which resultsin a raisingof the pivotal '40 point of the lever .and a consequent raising of the frame. Since the flanged wheel 19 is in position on the rail, said forward movementof thearm 26 resultsin an'elevation. of the frame, com

.parison of Figs. 4 and5 showing'the effect: of the movement. i

In a similar'manner the rear portionof the frame is elevated or depressed by the use of a bent lever pivotallymounted on the pin 27 earried by a bracket 27 projecting from the frame member 11. One arm 39. of .this lever is connected with the axle 22 and the other arm 40 is pivotally connected to the piston rod4l of an air cylinder 42, this arm 40being of spring-leaf construction. This air cylinder 42v is also pivotally connected to the frame member 30 in a manner similar to that described with reference to the air cylinder 35.

[Admission of compressed air to the forward side of the piston (not shown) in the air cylinder 42 results in a rearward movement of the arm' '40 and a resultant elevation of the rearward portion of theframe, whereby with the simultaneous admissionof compressed air to the cylinders 35 and 42, the machine is placed thetransport position.

The pressure of the compressed air is exerted indirectly against the springing tendency of the spring-leaf arms Y26 and 40 whereby a resilient ward bent levers 24 and 26 has integrally attached thereto a depending portion 43 terminating in a semi-cylindrical recess 44 known as a chair, in such position as to descend upon and rest on the upper side of the forward axle 21 when the air pressure is exhausted from the cylinder 35. The objectof this feature is to provide 'afixed point at the forward end about which the frame is swung in a'verticalplane when making adjustments during the grinding operation. Since the seat 44of the chair 43 is semi-cylindrical, movements of the frame in a vertical plane about the center of the chair stated easily take'place.

Release of the pressure in the cylinder 42 similarly allows the rearward portion of the frame to.

settle downwardly. The further downward move"- ment of the frameis arrested upon contact of theflanged shoes 45 and 46, being front and rear shoes, respectively, which are pivotally'attached to the lower ends of a semi-circular ring 4'7 suitably positioned in the vertical central plane of the rail 2. The shoes 45 and 46 and the ring 47 together with certain other. associated parts form the subject-matter of the Goering application referred to in the early part of the specification and are fully described both as to the construction and advantages in that application, it being-sumcient to state here that this ring and the shoes have the weight of the :maj or portion of the frame and itsparts when the frame is thus lowered.

In the present construction, however, weight of the frame is brought upon the supporting ring in a manner somewhat different from the the manner explained in the Goering application in order that thegrinding wheel may yield upwardly when meeting undue obstructions, this arrangement being one of the features of this in-l vention and will be explained later.

There will be noticed also a lever 48 on whose tion of which lever arrangement with the devices of Goering is fully'described in the Lanyon application previously referred to. While the rear axle and its'wheels merelyrest upon the rail due to their'own weight they are of further assistance T unit irrespective of the adjustments of its mating unit. This isprovided for in the manner of connecting the units of a machine.

Provision is made for so connecting the frames of each pair of units with the connector 4, that the frames may riseand' 'fallindependently of each other Referring. to Fig. 7, it will be seen that the connector member 4 is secured in an interposed position between the grinding units 3 by means of bolts 51 at the forward end, and 52 at therearward end. The bolts 51 pass through enlarged openings53in the forwardly extending webs 54 of the'connector, there. being oneof these webs on each side of the forward end of the connector, 55*being raised flat-surface bosses over which moves a collar 54 interposed between nuts 57and the surface of theboss 55. In the same manner at the rearward end inthe extended web portions 58 (see Fig. 6) the bolts 52 pass through elongated slots-59 concentrically disposed 'withthe axis of the forward axle 21. Interposed between the nuts 60 on the bolts 52'are shoes 61 which individual grindingrwheel .free end'is secured the weight '49, the combinaslide over the surface 62 surrounding the slots 59.

All of the bolts 51 and 52 on either side are secured in any suitable manner to the frame work 13 of that unit on that side as shown. in Figs. 8 and 'end the enlarged openings 53 may be 9, and the proper adjustment of the nuts 57 and 60 is to allow a freely sliding arrangement of the frames 13 with respect to the connector member 4. When the grinding machines are placed in the transport position by an application of compressed air tothe cylinders 35 and 42, the frames are elevated to a position shown bythe broken line 13a (Fig. 4). In preparing for the grinding operation, the air pressure is released from all cylinders causing the unit to be lowered to the position shown in Fig. l which position it should be stated is duerboth to the fact that the chair 43 is resting upon the front axle and a full sized grinding wheel has been mounted uponthe spindle. As the wheel wears and reduces in diameter,

moves through a greater angular movement and about a fixed center point such as iscarried by the axle 21, the slots 59 must be of ample length r and preferably concentricallydisposed with reference to the center with the axle 21. .In view of the smaller angular movements at the forward circular as shown.

Referring now to Figs. 10, 11 and 12, there illustrated an arrangement for permitting the grinding-wheel to yield when meeting undue obstruction such. as an abnormally high place on the rail or any other undue obstruction which the wheel many encounter, in connection withrny improved device for latching the grinding-wheel in inoperative position when such'a condition.

-Goering application, employs a screw 50 which is threaded in a nut 50' fixed to the main frame,

the lower end of which bears on'a block 64. The

lower end of the screw is preferably reduced and extends loosely in an aperture in the block and the shoulder thus formed rests upon the upper surface of the block. The lower portion of the block is. bifurcated and straddles the circular rib 47' of the ring 47 to actas a guide for the ring; the ring being further guided by guides 11 fixed to the frame 11.. Y 7

.As. in. the Goering application, there is employed an arch bar 6'7 having anti-friction rollers 67 which bear upon the rib 47, of the ring 47, but instead of securing this arch bar rigidly to the block as in. the Goering application, there is shown the means of the Lanyon application for transmitting the weight of the frame tothe arch bar by devices which permit thegrlnding wheel to rise and fall, which devices will now be described, in connection with my improved device for retaining the grinding wheel out of operative position. I

There is provided a forked lever 48 which extends upwardly and straddles the block 64, the lever being pivotally connected to the block by pins 65 inserted in opposite sides of the block. The lever 48 is also pivotally connected'by means of pins 66 to each of the pair of arch bars 67. The free end of the lever has mounted thereon the weight 49. The weight of the. frameis thus brought upon the ring 47 through the nut 50', screw 50, block 64,. pins 65, lever 48, pins 66 and arch bars 67, the weight 49 serving to partly counterbalance the weight of the frame and parts carried thereby to permit the more ready elevation of the grinding-wheel when meeting undue obstructions. v

My improved means for holding the grinding- Wheel in inoperative position when it has been raised when meeting an. obstruction consists of a bent lever 68 pivotally mounted on a bolt 69 passed through the upturned legs of a pair of parallel angle arms 70. The lever 68 is so situatedthat it swings on the pivot bolt 69 and is substantially at right angles to the swing of the lever 48, while the weight of thehandle 68 of this lever causes the lower end 72 to bear against the inside of one of the forks 48 of the lever .48. At a suitable location in the side of the lower portion .72 of the lever 68 adjacent the arm 48 isa notch 73 so that when a swing of the lever 48 occurs, of an extent such as is shown in Fig. 11, the weighted end 68' of. the lever 63 causes the lower end 72 thereof to engage the lever 48 by means of the notch 73. The release of the lever 48 is accomplished by. an attendant raising the handle end 68 of the lever.68, but preferably after investigation has been made and any obstruction that caused the upward movement of the wheel removed. An attendant may also elevate the wheel by downwardpressure upon the lever 48 by manual means.

I have also provided means whereby the wheel may be lifted from,.-the rail surface through the lever'arrangementgjust described by devices under control of. the operator of the tractor car.

Pivotally connected to the lever 48 is a small air cylinder 74 which is pivotally supported by the U- shaped members 75, Figs. 2 and 10. The U-shaped member is clamped to a bracket 76 by a bolt 77 and is provided at its outer end with inturned portions to form. trunnions 78 which are inserted in oppositely positioned openings in the base 79 of the air cylinder 74.. The piston rod 80 has at its lower end an eye 81 through which is inserted a cross-pin 82 passing through openings in the arms 48' of the lever. 48.. A pipe 83 conducts the air under. pressure from piping. connected to the cylinders .35 and. 42 and upon admission of compressed air to these cylinders, thelever 48 is depressed. The construction of the air cylinder 74 is such that a limit to an upward swing of thelever 48 is offered by contact of the piston rod with the upper head of the cylinderin order to prevent undesired contact of the grinding wheel with the track rail such as might occur if the lever 48 were free to swingbeyond the point necessary to properly position the grinding wheel with relation to the work. r

The air is exhausted from the cylinders by means of a common valve (not shown) on the tractor-car. This valve controls the admission of compressed air to a train line 84 (Figs. 1 and 6) which extends throughout the train andis connected by: any well known'type of air hose between the various units. Alateral branch 85 (Figs. 2' and'6) is'provided on each unit terminating in an air-cock 86 which is normally in open position and beyond. which the pipe 87 (Figs. 1 andfi) branches to form the piping 88 and 89 (Figs. land 6) to conduct the air to the cylinders 35 and 42 respectively and also to the cylinder 74 by means of the pipe 83 previously men-- tioned.

In operation, air is supplied to the cylinders 35,

42 and 74 which raises the main frame and parts carried thereby and also depresses the "lever 48 and causes itto become engaged with the detent lever 68 (Fig. 11). The apparatus can then be readily transported to the place where the grinding operation is to take place. At that point, the air in each of the three'cylinders is exhausted which allows the main frame and parts'icarried therebyto descend until .the weight thereof is carried by the front axle and the supporting ring 47. The lever48, however, is still engaged with the lever 68 so that the grinding wheel is main tained in slightly elevated positionwith relation to thework to an extent of about 1/.64".. In practicahowever, the screw 50 has been initially adjusted so that the" grinding. wheelwill be elevated to a greater extent with relationtothe work. The operator thenreleases thelever 68 and thereby allowsthe grinding wheel to descend to the .extentnoted, the proper positioning of the grinding wheel withrelation to the-work being thereafter secured by adjustment of the to permit this horizontal position. As the wheel wears. away; it may be advisable to vary slightly the balancingweight 49 by the removal of a portionthereof. The downward settling of" the unitdue to the release of the lever is of a gentle.

nature, due to the utilization of the air-cushioning property of the air-cylinder '74. r r i Adjustments for depth of out should at. all times be made while the train is in the slow for ward grinding speedin order to prevent cupping, which will occur if the wheel is allowed to dwellf for any length of time. On reaching a, point which requires nogrindingor an. enforcedkstop due to other traffic, thegrinding .whe'els shouldflbe elevated before the train is broughtto a stop, the elevation being. accomplished by the admission of air to the train-line 84 by use of the tractor-car operators valve. In,

this way, the car operator, being in a position to observeother traffic, has controlover the move ments of the train and simultaneous elevation of. the grinding wheels, while the attendant may independently elevate'any wheel by manually depressing the lever 48. I i r .When it is desired to grind a "comparatively short section of rail surface such as a built-up place or a railjoint, the preferable method is to utilize one wheel only, alternately reversing the movements of the train. The'remainder of the grinding wheels are elevated to .thenon-contacting or transport position, and contact of the wheel in use is'perm'itted only on theforward movement of thetrain. T

5 this :position, while -the train-line remains charged with compressed air. during agrinding operation of this type. The wheel in=use is adjusted for a cut of the desired depth by the at.-

.tendant on a forward movement of the train, and on. passing beyond the surface to be ground, is elevated by, the opening of its individual air-cock 86 by the attendant, after which the tractorcar' operator :stops and reverses the train, the operathese are usually staggered, the train merely respectively to saidapparatuses.

Thelunits not in uselarexelevated by. air

connecting the forward end of a trailing appara.-"

tuswith the forward end of a preceding*appara-' tussaid means extendingfrom end to end of the preceding apparatus. 1

' 2.In a grinding apparatus for track'rails, a

plurality of grinding apparatuses arranged in series to run upon'the track rails, and means for connecting the forward end of a trailing appara tus with the forwardrend of 'a precedin'g apparatus, said means including a reach rod-which extends from the forward end of one apparatus to the forward end of the-other. 1

3. In a grinding apparatus for track rails,fa

plurality of grinding apparatusarranged in 'se ries to run upon the'trackiails, and means for connecting-the forward end of a trailing apparatus with the forward end of a preceding apparatus, said means including areach rod which extendsfrom the forward end of 'oneapparatus to the'forward end of the other, and means for universally connecting the ends of said reach r0 4; In a grindingap'paratus'for track rails, a

plurality of grinding apparatuses in series'to run.

upon thetrack'rails, and means for connectin the forward end'of a trailing apparatus withthe forward endof a preceding apparatus, said means including a reach rod which extends from the forward end of one apparatus to the forwardend of thexother, a yoke-shaped member pivotally connected with each end of said -rod,and universal means for connecting said yokes respectively .with the forward ends of saidapparatuses.

5. In agrinding apparatus for track rails, 'a plurality of grinding apparatuses arranged in seriesto run upon the track rails, each apparatus consisting of a pair' of side-by-sideconnected units, and means for connecting the forward end of a trailing apparatus'with the-forward end of a preceding apparatus, said means extending between the units of'the preceding apparatus.

6. In a grinding apparatus for trackrails, a plurality" of grinding apparatuses arranged in series to run upon the track rails, each apparatus consistingof; a pair of side-by-side connected units, and means forconnecting the forward ends of the units of a trailing apparatus with the forward endsof the units of apreceding apparatus, said means extending between the unitsjof the preceding apparatus.

'7. In a grinding apparatus for track rails, a

consisting of a pair of side-by-side connected units, and means for connecting the forward end of a trailing apparatuswith the forward end of aprec'eding apparatus, saidmeans including a reach rod which extends from the forward end of one apparatus to the forward end of. the 'other'.

8. Ina grinding apparatus for track rails, a plurality .of grinding apparatuses arranged i in series to run upon thetrack rails, each apparatus consisting of a pair of side-by-side connected units, and means for connecting ;the forward ends of the unitsof a trailingapparatus withthe forward ends of theunits .of a preceding apparagtus, said means-including a yoke-shaped memb.? universally. connected withithe forward en arm of said'lever.

of the units of eachappa'ratus and a reach rod pivotally connecting'the yokes. I

9. In an apparatus for grindingtrack rails, a patio! grinding machines arranged side-by-side, front" and rear ax1es,,a pair of wheels for each axle arranged to run upon the rails, a connector member directlyisupported by'said axles, and

means for movably connecting, each machine to said connector to permit therise and fall of each machine independently of the other. v 10. In an apparatus for grinding'track rails, a

pair of grinding machines arranged side-by-side, front and rear axles, a pair of supporting wheels for each axle arranged to run upon the track rails, each machine when in working position being pivotally supported by one of said axles, additional means for, supporting each machine when in working position from one side of the track, a

, connector member between said machines direct-, 1! supported by said axles, and means for connecting said, machines to said connector member to-permit the rise and fall of each machine independently of the other. I

' ll. In a grinding apparatus for track rails, a pair of grinding machines arranged side-by-side, front and rear axles, a pair ,of wheels for each axle arranged to run'upon the track rails, means for supporting one end of each machine by one of said axles such as to permit the machine to swing uponthe arc of a circle, a connector member between said machines supported by said axles, and loose connections between saidmachines andsaid connector member to permit the rise and fall of each machine independently of the other, the connections between one end of each machine and said connector member consist ing of bolts on said machines extending throug arcuate slots onsaid connector.

12.In a grinding-apparatus for track rails, a supporting frame, a grinding wheel mounted on said frame, a support for said frame adapted to slide on .the rail, means foradjusting the relation'betweensaidsupport and frameto properly position the grinding wheel with relation to-the rail, front and rear axles, wheels for supporting said axles-from the track rails, a bent lever pivotally connected with each end of said frame, the pivotal point being located intermediate the ends of said lever, one end of each lever being adapted to be fulcrumed upon one of said axles, and fluidpressure means connected with the other end of ach lever to raise and lower said frame,

13. In a grinding apparatus for track rails, a supporting frame, a grinding wheel mounted on said frame, front and rear axles-wheels supporting said axles from thetrack rails, a bent lever at each end'of saidframepivoted thereto at a point intermediate the endsv of said lever, one arm ofeach of said levers being adapted to-be. fulcrumedupon one of said axles, the'other arm'of tion between said'support and frame to properly position the grinding wheell'with relation to the raiLfront and rear axles, wheels for supporting said axles from the track fails, a bent lever pivotally connected with each end of said frame, thepivotal point being located intermedi-' port, said frame being supported by said lever atethe ends of said lever, one end of each lever being adapted to be fulcrumed upon one of said axles, and fluid-pressure means connected with the other end of each lever to raise and'lower said frame, the fluid-pressure cylinders being of different lengths whereby one end of said frame will be elevated higher than the other.

15. In a grinding apparatus for track rails, a supporting frame, a grinding wheel mounted on said frame, a support for said frame adapted to slide on the rail, means for adjusting the.relation between said support and frame to properly position the grinding wheel with relation to the rail, front and rear axles, wheels for supporting said aides from the track rails, and means for raising said frame with relation to said axles consisting of a lever at each end of said frame pivotally carried thereby, each lever being fulcrumed on one'of said axles on one side of the pivotal point thereof, a fluid-pressure cylinder foreach lever, and a pivoted connection between the other end of said lever and the piston rod of said cylinder.

16. In a grinding apparatus for track rails, a supporting-frame, a grinding wheel supported on said frame, front and rear axles, wheels for supporting said axles fromthe track rails, means for raising said frame with relation to said axles consisting of a lever at each end of said frame. pivotally carried thereby, each lever being fulcrumed on one of said axles on one side of the pivotal point thereof, a fluid-pressure cylinder for each lever, a pivoted connection between the other end of said lever and the piston rod of said cylinder, means for supporting one end of said frame by one of said axles when said frame is lowered, and additional means for supporting said frame from said rails when lowered other than the remaining axle, said additional supporting means being adapted to slide on the rail, and adjustable means to alter the relation of the said additional supporting means and the frame to properly, position the grinding wheel with relation to the rail. I

17. In a grinding machine of the character described, a grinding wheel, a main frame upon which saidwheel is mounted, a wheeled support for one end of said frame, a second support for I said frame movably positioned on the work, said frame being capable of being elevated with relation to said second support, means for partly .of said fulcrum point, and a detent automatically engageable with said lever to hold said frame and wheel in raised position. 1

18. In a grinding machine of the character described, a grinding wheel, a main frame upon which said wheel is mounted, a wheeled support for one end of said frame, a second support for said frame niovably positioned on the work, said frame being capableof being elevated with relation -to said second support, means for partly counterbalancing the weight of said frame and wheel,including a lever fulcrumed upon said supupon one side of the fulcrum point thereof, a

weight connected with'said lever on the other side of said fulcrum point, and a fluid-pressure cylinder having its piston pivotally connected with said lever toraise 19. In a grinding machine of the character described, a grinding wheel, a frame upon which said wheel is mounted, a support for said frame movably positioned on the work, said frame being capable of being elevated with relation to said support, means for partly counterbalancing the weight of said frame and wheel, including a lever fulcrumed upon said support, said frame being supported by said lever upon one side of the fulcrum point thereof, a weight connected with said lever on the other side of said fulcrum point, a fluid-pressure cylinder having itspiston pivotally connected with said lever to raisev said frame and grinding wheel, and a detent automatically engageable with said lever tohold said frame and wheel in raised position.

20. In a grinding machine, a main frame, a wheeled support at one end of said frame upon which said frame is pivotally supported, a second support for saidframe having itwo'points of contact with the track, a grinding wheel supported by said main frame between said two points of contact, said main frame and grinding wheel being capable'of elevation independently of said support, means for partly counterbalancing the weight of said main frame and wheel, said means including a lever fulcrumed on said support on one side of the fulcrum of which said frame is mounted, a weight connected with the lever on the other side of the fulcrum thereof, and a detent automatically engageable with said lever to hold-said frame and wheel in raised position.

21. In a grinding machine, a main frame, a Wheeled support at one end of said frame upon which said frame is pivotally supported, a second support for said frame having twoipoints of contact with the track, a grinding wheel supported by said main frame between said two points of contact, said main frame and grinding wheel being capable of elevation independently of said support, means for partly counterbalancing the weight of said mainframe and wheel, said means including a lever fulcrumed on said support on one side of the fulcrum of which said frame is mounted, a weight connected with the lever on the other side of the fulcrum thereof,v

and a fluid-pressurecylinder having its piston rod pivotally connected with said lever to raise said frame and grindingwheel, and a detent engage-able with said lever to hold said frame and;

- wheel in raised position.

HERMON G. WEINLAND.

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