US2378512A - Single rail grinder - Google Patents

Description

5 Sheets-Sheet l w v w. m at J M k q i June 19, 1945. H. H. TALBOYS ETAL SINGLE RAineRmD R Filed Jan. 7, 1942 June 19, 1945. H. H. TALBOYS EI'AL .SINGLE RAIL GRINDER FiledlJan. '7, 1942 5 SheetsSheet 2 June 19,1945. H. H. TALBQYS ETAL 2,378,512

SINGLE R-AIL GRINDER Filed Jan. 7, 1942 s Sheets-Sheet a J n 1945- H. H. TALBOYS EI'AL SINGLE RAIL GRINDER Filed Jan. 7, 1942 5 Sheets-Sheet 4 5 SM 510 {r Wflfl Z J I fl MM 4 M. y z

Jun e 19, 1945; H. H. TALBOYS ETAL SINGLE RAIL GRINDER Filed Jan. 7,1942

5 Sheets-Sheet 5 f I i r Patented June 19, 1945 UNITED sT -n:s PATENT orncs SINGLE RAIL GRINDER Henry H. Talboys and Helmer E. Erickson, Milwaukee, Wis., assignors to'Nordberg Manufacturing 00., Milwaukee, Wis., a corporation of Wisconsin A plication January 7, wraseriaiivo. 425.846

23 Claims. (01. 51-1278) .The invention relates tov an improvement in track working toolsv and has .for one purpose the provision of a. track working tool, for example la-raiL-grinder, which is mounted on and movable along a single rail of a track.

Another purpose is. the provision of improved drive means ,for a, track working member, such tor-example as a grinder.

position on a single rail, for example when it is I .outlof vuse-or in intervals between use.

:Other purposes will appear from time to time in the. course of the. specification and claims.

.The invention is illustrated more or less diagrammatically in the accompanying drawings.

wherein:

.Fig. 1 is a side elevation; Fig. .2 isa plan view; A ,Fig. 3 is an end view, with parts broken I and parts omitted;

.Fig- 4 is a section on the line 4-4 of Fig. 1; Fig. 5 is. adetail;

.6 is a vertical axial section on an enlarged scale through thegrinding member and the drive .thereior, on the line 6-5.of Fig. 2;

7 is asectionon the line 1-1 of Fig. 6;

'Fig. Sis a section on the line 88 of Fig. l;

9 is a section on an enlarged scale taken on the line 9-9 of Fig. 8.;

Fig. .10 is. a section on the line lit-l0 of Fig.9;

Fig. 11 is a section on the line |.l-.l I of Fig.6; Fig. 12 is a section on the line 12-12 of Fig. 6;

and a Fig. 13 is .a detail.

Like parts are indicated by like symbols throughout the specification and drawings.

Referring to the drawings, I generally indicates a rail of a track. the rail being mounted for example on any suitable ties 2. A generally indicates a track working mainframe of away ' the frame.

extending .end portion 21.

the opposite .ends of the .main irameA. .Qneot the wheels is ,shownas journaled inthe' downwardly extending ears 9 mounted'on the cross members 41. The-oppositeroller is .iournaled on ears in extending downwardly from the transverse ;framelmembers 5. at the opposite end of The ears a, for example, may be mounted on ,a plate ll, and 12 indicates height .adjustingshims. a At one end of the frame areapairof upright frame members 13, J3, and intermediate .the middle of the vframe area second pair of uprights l4, 14. The topsof the members .13 are connected .by a transverse frame .member 15. .Each pair 20f members l3 and [4 are connected by .a handlebar IS, the .endsnf the handlebar extending outwardly beyond the frame, as at .11. On the tops of the inner .end of the handlebars 16 area pair of transversely extending .irame -memb.ers 18,. shown for example .atthe middle of the ton-of ;.Fig.. .1.' Extending. longitudinally horizontally .along. the ironic from. one of "the members I8 is an axially disposed handlebarJQ. supported at the opposite. end of the name by triangle members 251 nd having an outwardly Themembers l4, M are also connected intermediate their ends by a transverse frame angle member .22, to which are welded apa'ir of spaced abutment blocks 23.

The " intermediate frame members 6, 6 are also connected by apair of spaced longitudinally- .extending frame members 24. In the space defined by the framev members 6 and 24, asshown .in Fig. 8, is welded ,or otherwise. secured a. ring 25, which serves asaspecies of housing .orguard member .for the below described .grinding .ele-

ment. It will be observed that it. is upwardly curved .orcutiawayat one side,-as at 28.

Mounted .on .the abutment blocks 2-3 of the cross members 22 and on the bottom intermediate frame members 24 .is a housing or support generally indicated as B, which includes a half .roundportioniii, which is completed at the top by a ring. portion, the two being held together a grinder; which may include for example two I by bolts 32 and any suitable nuts 33. Within. the structure thus formed is any suitable ball race structure generally indicated as 342. A similar ballrace 35 is mounted toward the bot.-

tom of the member 3.0, it being defined between the lower portion of the member 30 and the;split half ring portion .36. At :the bottom, of'the member ill) :is a generally conic half skirt 3.1.

The. ski-rt portion 31 is provided with a pair of flanges 38, which may be bolted .or otherwise secured to the. membersz l. The upper portion of the member 30 is secured to the angle member 22, for example by any suitable bolts 40. Also secured. to an upper portion of the member 30 is a, plate M, which may be held in position for example by spacing washers 42 on the bolts 32. The plate 4| carries a vertical rod 43, the upper end of which is seated in a socket 44- on the bottom of the single handlebar I9.

Mounted for rotation within the ball bearing races 34 and 35 is an outer sleeve 45, and a generally conic frictional driven member 46. It moves unitarily with the sleeve 45, being secured thereto in any suitable way. Keyed within the sleeve 45, as by the key 41, is a splined sleeve 48. It is positioned, for example, by an inner sleeve or hollow tube 49. Within the splined sleeve 48 is the grinder shaft 50, provided with grooves 5| to receive the teeth of the splined sleeve 48. Thus,

' it will be understood that the grinder shaft 50 may move vertically in relation to the outer sleeve 45, and the parts which move unitarily with the outer sleeve 45, but that it may be rotated in response to rotation of the outer sleeve 45. Mounted at the lower end of the grinder shaft 50 is a hub 52, which abuts against a bottom enlargement 53 of the shaft 50 and which may be held in relation thereto for example by the screw 54. The screw 54 is provided with a head 55. which serves to clamp the inner or upper plate 56 in relation to the hub 52 and the shaft 50. 51 is the grinding member proper, herein shown as a hollow ring extending downwardly from the plate 56, and connected thereto in any suitable manher. If desired, a yielding skirt 58 may be employed to prevent the access of dust to the shaft 50, the skirt being mounted in any suitable fashion and being longitudinally extensive, as by being provided with folds.

The shaft 50 is provided with a reduced portion 60, which receives the inner race of the third ball bearing assembly, generally indicated as BI. 62 is a locking nut to hold the shaft and the inner race against relative movement.

The outer race 63 is supported within a sleeve 64, which in turn is connected to a tube 65, which,

is screw threaded as at 66 to mesh with corresponding threads of the interior of a sleeve 61 integral with or secured to the enlarged hub 60 of the hand control wheel 69. The hub 68 rests.-

Screw threaded to the bottom of the sleeve 64 is a split locknut l5,which maintains the ball bearing assembly 6| in place in relation to the sleeve 64. The split nut 15 is surrounded by an open ring 16, the ears 'I'! of which straddle the vertical rod 43 and are bolted together as by the bolt 18, with spacers I9 welded if desired on the ears 11. v

80 is a spring compressed between the fixed ring 10 and the split ring I5, the spring tending normally to urge the grinder shaft 50, with the grinder element 51 thereof, downwardly toward the rail.

When the wheel 69 isrotated inone direction,

it raises the sleeve 65, and with it the ball bearing assembly 6I and the shaft 50. When the wheel is rotated in the opposite direction, it lowers the shaft 50. If the assembly thus provided is lowered far enough, the grinding wheel 51 engages the top of the rail, as illustrated in Fig. 4. Any further rotation of the wheel 69 is then effective to permit the spring to thrust the shaft 50 and the grinding wheel 51 yieldingly against the top of the rail. The user thus does not have to exert any downward pressure, but merely has to control the position of the parts by rotating the wheel 69. l

The grinding assembly is driven by a motor generally indicated as 65, the details of which do not of themselves form part of the present invention. The motor is provided with any suitable motor shaft 85. Mounted on the shaft 86 .is a frictional driving member 8?, which may be of fiber or the like. The frictional member proper is secured as by bolts 88 to the flange 89 of a hub 90, the hub and flange being keyed, as at 9|, to the shaft 86. Screw threadedat one end on the hub 96 is a ring 92, provided with a socket 93, which receives a spring thrust ball 94, adapted to seat in either one of a pair of seats 95 in a ring 96, which is also keyed to the shaft 86, and which abuts against a shoulder 9'! on the shaft 86. It will be understood that the ring 92 may thus be employed as a species of takeup ring to compensate for wear'of the frictional drive member 81, and the balls serve to prevent unintended rotation of thering.

The engine is mounted on a platform I00, which is supported on an inner tube IilI, which penetrates blocks I532 secured. upon the side frame members 3. An outer tube I03 is connected, as by plates !!l4,' with the platform I00. Welded or otherwise secured to the opposite edge of the platform I60 is an angle member I05, to which is welded a wedge block IE6. I0! is a plate welded to the transverse frame members 6 and overlying the wedge block it. Between the plate I 01 and the wedge block m6 is a movable wedge I08, which is yieldingly urged to the right, referring to the position in which th parts are shown in Fig. 9, by a coil spring I08. the opposite end of which is secured to an earl in on one of the side fram members 3. MI is aguide pin welded to the angle I05 and extending upwardly through an aperture in the plate I01. A spring H2 surrounds the pin III and is compressed between the members I 05 and IN. Thus, the weight of the platform may be employed to hold the frictional driving element 87 in driving relationship against the frictional driving element 46, whereby the grinding shaft 50 is driven. The wedge I08 prevents dancing of the motor platform and thus dancing of the driven member 87, and creates a positive engagement between the opposed members 81 and 46. The platform I 00 is held in proper alignment by bars I I3 welded to the frame members 3.

While the grinder is generally balanced on a rail I, and when in use is held in an erect position manually by the operator, it often becomes necessary to leave it at rest without takin it off the rail. In order to obtain this result, a vertically adjustable support in the form of a rod is provided, generally indicated at I50, and it is provided for convenience with a sharp lower end Hit, and a top handle or crook i572. The rod ll ii may be guided in a plurality of eyes I53. I 54, which may be in the form of bands welded to the ver tical frame member I3. I55 is a plate welded or otherwise secured to the frame member I 3 and provided with an upper notch I56, which may receive an outwardly extending ear or lug l5! on the rod I50. This lug is normally moved into ammo.

msttiom saw the m insured "to nautical :itramemember 1 3, 25 at 259.

ammo lilat'e MU may be aidjustaibly'mouzrted, at

arpmrall'mofipoaltions'mmlation to the: members III-and It, osf bysmds lili t, -=penetrating any or a plurality-autonomous fill- Anysuitafole nuts: Hi3 may he hold it position.- plate ISO is provided with a. bottom adjusting mtch l and an outward bottom extension. 165

' "dthoriposltton the: lug is held engaging mutton. by the :above mentioned spring 158- i ffibe.='mtor :of mass of the grinder as: :awholelsot'to atl're :ofi :Che rail, re'fi'erring to imposition. :oithe xpartsshown in Fig. '3; Thoreflnrm. when the -member 4.50 is adjusted to the 'dottad position: of Rig. $3 and the device. is releaxod, will Itili; 'llhe Jlefi; until the -.sharp "11 l l3" rmesfme tie 2 01'. the roadibed. Preieruhly fitis dropped into engagement with "the tie, and. sham by sinking into the: tie, mnlrslmdeslred longitudinal movement of the Itwlll hetreall'zed'that whreassa practicaland a device is described and illustrated,

. the :irlutton 181 11100111711111.0115; .oontaot with neuetthlasntmany changes be made in :the

' fho mndzirom axpoint tot uso.v litzmaysreadilw Lh'e :remougdimm'thetraok jlto permit the nassag'eof 1.0psrator, 'whm :grimding, releases the-lgrlnder'iizl' toganrall.engagmgcpositi'onby'zrotating theluand wheel 88 .ltwlll beunderstood that downwardly only sprlngllflin addition, (of momma, to the weight of Ethe igrrindingxm-emloer. Thispart oi the mechanism :is,atherefore, nee to if the grinding wheel should meet :afhig'h on the rail lnr rsuchifashion that it nan accommodate itself to changes in nontour in: height of the rail.

Tho-drive is maintained between the beve'led .drlvlng member 8] aandt-he beveled or .conicadrivon member #6. The weightof the engine and .engmoeplatform is employed to maintain an ad- (equate irictlonal driving. connection Referring,

.ioreexamnle to'r'igt 1, therenglne platform with the amine on it. rotates about the "center gsnerallylndioated at till. The weight of firepower .plant. is supported'hy this horizontally :axised .tllt1ng oomiection :on th (one hand, and by the drlvenimember lfi onthewother. The member M overlies the member {and an =eflective drivin oontaot lsxthnsmhtai-nadt An .ieature of the devioel :is shown in Fig. 9. fl'ne'wedge [ill-81s yieldinglynrgedto the might refierringrto the nositnm in which the 41am 9, "this wedge tends to the member 16. Thnwwgetalso obviates the tendency of the platform to chatter when the engine .ls running at. 'mg'lnspoed. Thus it prevents the imtemnittenit relief or driving .con- Mct which otherwise occur between the two irioti-on wheels; and materially "contributes to the nf driving connection.

What is: clalmed'iis:

.1. In a. rail grinder. azl-suppontmg frame tilt.-

ably rand longitudinally moved :and: entirely sup- 9 ported on .a single-rail: of a track, a g-rmder shaft moumted' on sxidclrame for:rotxaution about a. genuertinal: axis, a motor mounted :on said frame; :a htiotlonal- :daziving nonneotion between said. motor and :said shaft, including a frictional driving member driven. ,by' the motor, and a. trim tion-al member held against rotation in relati-on towsaldrshait saijd shaft being axially movable in relation toosaid driven memher, agri-ndmg tool at the lower-end. of. said-shaft; means for normally supporting said grinding tooland shait,

with the grlndingtool upward-1y spaced from the 1 topoi the rail, manually operable means {or moving. saidshaft andlgzrinding tool. downwardly toward the rail, and a platform on which said.-mo-- tor mounted, said. platform .belng movable' in relation. to the supporting frame, the frictional driving member associated with the motor and platform being gravitally held .by the Weight .of the nlatform andmotor contact withthe: fric- .tional drlvenimembon 2. In combination, in arail grinder, a, support mounted to: tiling qmofvementlon the single. rail of a track a grinding"tool and shaft therefor mounted-for rotation onsaid suuportabouta generally vertical axis aligned with the topot the rail means for lmpartingaxlalmovement tosaid shaft and tool, and driving means :for the shalt tool. including; a. .-riotional driven element located .adiaoent the bottom. of the shaft and above-the tool, and; having an upwardly :oonlo surrace, and, held against rotation relation 'to the shaft and tool, the tool being axiallymovabloin. relation. thereto; a drive shaft :and means for driving. it, and a-irlotiona'l driving element mounted thereon and having a conic surface opposed to thev conic surface or the drivenmember, and means tor-maintaining the two members in driving .contacn'inoluding a, platform on which said. driving element and the means for drivin it are mounted, said platform being movaloly mounted *on the: frame, the weight of said plat? form and the. :parts mounted thereon beinaof- :footlve to @urge the. frictional element downwardlyragalnst :the friotionaldriven element.

3.. In a track grinden; a supporting frame and means forsuppomtlng it ionazsinglo track mail for movement longitudinally along the rail and for transverse tilting movement in' relation to the a generally upright grinding: shaft on said frame, thermos-oi which isnormally fixedlnrelation; to'tne frame, said grinding shaft having-a zmemherrat-the:lowerzndthereoi, a platform =.pivotally mounted on the frame for rotatlon about a, generally .lronizonal axis; motor means on said platform; adriveishait extending from said. motor. means and away from the vpivotal connection 'hetweenrplatforxn and frame, a

frictional drive member mounted. fior rotation vvitllsaid'clrivexslrxaft, a frictional zdriven.-member associated with. said grinning. shaft and adapted to underlie and engage. saidzfriotionalv drive memaber,.:the weight of the platiormandmotormeans being effective to hold said frictionaldrive member gravitally downwardly against said frictional driven member in effective driving con tact therewith. '3

4. In a track grinder, a supporting frame and means for supporting it on a single track rail for movement longitudinally along the rail and for transverse tilting movementin relation to the rail, a generally upright grinding shaft on said frame, the axis of which is normally fixed in relation to the frame, said grinding shaft having a grinding member at the lower end thereof, a platform pivotally mounted on the frame for rotation about a generally horizontal axis, motor means on said platform, a drive shaft extending from said motor means and away from the pivotal connection between platform and frame, a frictional drive member mounted for rotation with said drive shaft, a frictional driven member associated with said grinding shaft and adapted to underlie and engage said frictional drive member, the weight of the platform and motor means being effective to hold said frictional drive member gravitally downwardly against said frictional driven member in effective driving contact therewith and means effective normally to urge said grinding member downwardly against the surface of the rail, said grindin shaft being axially movable in relation to the frictional driven member.

5. In a track grinder, a supporting. frame and means for supporting it on a single track rail for movement longitudinally along the rail and for transverse tilting movement in relation to the rail, a generally upright grinding shaft on said frame, the axis of which is normally fixed in relation to the frame, said grinding shaft having a grindin member at the lower end thereof, a platform pivotally mounted on the frame for rotation about a generally horizontal axis, motor means on said platform, a drive shaft extending from said motor means and away from the pivotal connection between platform and frame, a frictional drive member mounted for rotation with said drive shaft, a frictional driven member associated with said grinding shaft and adapted to underlie and engage said frictional drive member, the weight of the platform and motor means being effective to hold said frictional drive member gravitally downwardly against said frictional driven member in effective driving contact therewith, and means effective normally to urge said grinding member downwardly against the surface of the rail, said grinding shaft being axially movable in relation to the frictional driven member and means for varying said yielding thrust.

6. In a track grinder, a supporting frame and means for supporting it on a single track rail for movement longitudinally along the rail and for transverse tilting movement in relation to the rail, a generally upright grinding shaft on said frame, the axis of whichis normally fixed in relation to the frame, said grinding shaft having a grinding member at the lower end thereof, a platform pivotally mounted on the frame for rotation about a generally horizontal axis, motor meanson said platform, a drive shaft extending from said motor means and away from the pivotal connection between platform and frame, a frictional drive member mounted for rotation with said drive shaft, a frictional driven member associated with said grinding shaft and adapted to underlie and engage said frictional drive member, the weight of the platform and motor means being effective to hold said frictional drive member gravitally downwardly against said frictional driven member ineffective driving contactthere-j with, andmeans effective normally to urge said grinding member downwardly against the surface of the rail, said grinding shaft being axially movable in relation to the frictional driven member, and means for inhibiting said downward thrusting means and for holding said grinding member upwardly out of contact with the rail.

7. In a track grinder, a supporting frame and means for supporting it on a single track rail for movement longitudinally along the rail and for transverse tilting movement in relation to the rail, a generally upright grinding shaft on said frame, the axis of which is normally fixed in relation to the frame, said grinding shaft havin a grinding member at the lower end thereof, a platform pivotally mounted on the frame for rotation about a generally horizontal axis, motor means on said platform, a drive shaft extending from said motor means and away from the pivotal connection between platform and frame, a frictional drive member mounted for rotation with said drive shaft, a frictional driven member associated with said grinding shaft and adapted to underlie and engage said frictional drive member, the weight of the platform and motor means being effective to hold said frictional drive member gravitally downwardly against said frictional driven member in effective driving contact therewith, and release means adapted to permit relative movement of the frictional driving member and the drive shaft in response to excess torque,

8. In a track grinder, a supporting frame and means for supporting it on a single track rail for movement longitudinally along the rail and for transverse tilting movement in relation to the rail, a generally upright grinding shaft on said frame, the axis of which is normally fixed in relation to the frame, said grinding shaft havin a grinding member at the lower end thereof, a platform pivotally mounted on the frame for rotation about a generally horizontal axis, motor means on said platform, a drive shaft extending from said motor means and away from the pivotal connection between platform and frame, a frictional drive member mounted for rotation with said drive shaft, a frictional driven member associated with said grinding shaft and adapted to underlie and engage said frictional drive member, the weight of the platform and motor means being effective to hold said I frictional drive member gravitally downwardly against said frictional driven member in effective driving contact therewith, and release means adapted to permit relative movement of the frictional driving member and the drive shaft in response to excess torque, and means for limiting the are through which the platform can rotate.

9. In a track grinder, a supporting frame and means for movably supporting it on a rail, a grinding shaft and a grinding member thereon, and means for rotating said grinding shaft including a frictionally driven member movable in unison with said grinding shaft, a motor platform pivoted on said frame for rotation about a generally horizontal axis, a frictional'drivin'g member and a motor on said platform for rotating it, said driving member overlying and resting gravitally upon said frictional driven'member, the weight of the platform and the motor being effective to maintain frictional contact between the driving and driven members and means for preventing chattering of said platform.

10. In a track grinder, a supporting frame and means for movably supporting it on a rail. a

and lowering said shaft, including a limit'memher in which the upper end of said shaft is rotatably supported, and yielding means tending normally to urge said shaft and grinding member downwardly toward the track rail, said means being effective, when the limit member is moved downwardly a predetermined distance, to maintain a yielding downward thrust of said grinding member against the rail.

18. In a grinding assembly for track grinders, a frame and means for movably supporting it on a track rail, a sleeve mounted for rotation on said frame about a generally upright axis, a frictional driven member adjacent the lower end of said sleeve, a motor movably mounted on said frame, including a frictional drive member in gravital engagement with said frictional driven member, a grinding shaft mounted for rotation within and in unison with said sleeve and connecting means therebetween adapted to permit longitudinal movement of shaft While holding it against rotary movement in relation to said sleeve, a limit member, located above the upper end of said sleeve and means for raising and lowering it, a

bearing engagement between the upper end of said shaft and said limit member, adapted to permit rotation of said shaft in said limit member while limiting the downward ovement of said shaft, and yielding means on said frame, adapted, when the limit member is moved downwardly a predetermined distance, yieldably to urge said shaft downwardly and thereby to maintain said grinding member yieldingly against said track rail.

19. In a track grinder, a supporting frame and means for movably supporting it on a rail, a grinding shaft and a grinding member at the lower end thereof, and means for rotating said grinding shaft including a frictional driven member movable, in unison with said grinding shaft and held against rotation in relation thereto, a motor pivoted on said frame for bodily rotation about a generally horizontal axis, said motor including a frictional driving member, said driving member overlying and resting gravitally upon said frictional driven member, the weight of the motor being effective to maintain frictional contact between the driving and the driven members, said grinding shaft being vertically movable in relation to said frictional driven members, and means for preventing chattering of the motor in relation to the frame during operation of the drive.

20. In a track grinder, a supporting frame and means for movably supporting it on a rail, a grinding shaft and a grinding member at the lower end thereof, and means for rotating said grinding shaft including a frictional driven member movable in unison with said grinding shaft and held against rotation in relation thereto, a motor pivoted on said frame for bodily rotation about a generally horizontal axis, said motor including a frictional driving member, said driving member overlying and resting gravitally upon said frictional driven member, the weight of themotor being effective to maintain frictional contact between the driving and the drivenmembers, said grinding shaft being vertically movable in relation to said frictional driven members, and

means for preventing chattering of the motor in relation to the frame during operation of the drive, including a wedge member interposed between said motor and said frame and yielding means for urging said wedge member into chatter preventing position.

21. In a track grinder, a supporting frame and means for movably supporting it on a rail, a grinding shaft and a grinding member at the lower end thereof, and means for rotating said grinding shaft including a frictional driven member movable in unison with said grinding shaft and held against rotation in relation thereto, a motor pivoted on said frame for bodily rotation about a generally horizontal axis, said motor including'a frictional driving member, said driving member overlying and resting gravitally upon said frictional driven member, the weight of the motor being effective to maintain frictional contact between the driving and the driven members, said grinding shaft being vertically movable in relation to said frictional driven members, and means for preventing chattering of the motor in relation to the frame during operation of the drive, including a wedge member interposed between said motor and said frame and yielding means for urging said wedge member into chatter preventing position, along a path generally parallel with the axis of rotation of the motor in relation to the frame.

22. In a track grinder, a supporting frame, means for movably supporting it on a single rail of a track, including a pair of longitudinally aligned rollers mounted on said frame for rotation about parallel transverse axes, a grinding shaft mounted on said frame for rotation about an axis perpendicular to the axes of rotation of said rollers, means for driving it, said shaft being longitudinally movable, along its axis, in relation to said supporting frame and including a grinding member'at its lower end adapted to engage the rail at an area between said supporting rollers, said supporting frame being adapted for ready transverse tilting in relation to the rail, and means for yieldingly urging said grinding member downwardly against the upper surface of the rail.

23. In a track grinder, a supporting frame, means for movably supporting it on a single rail of a track, including a pair of longitudinally aligned rollers mounted on said frame for rotation about parallel transverse axes, a grinding shaft mounted on said frame for rotation about an axis perpendicular to the axes of rotation of said rollers, said shaft being longitudinally movable, along its axis, in relation to said supporting frame and including a grinding member at its lower end adapted to engage the rail at an area between said supporting rollers, said supporting frame being adapted for ready transverse tilting in relation to the rail, and means for yieldingly urging said grinding member downwardly against the upper surface of the rail, including a power plant for rotating said shaft, said power plant being movably mounted on the frame, and a driving connection between said power plant and said shaft adapted to apply the weight of said power plant to the shaft.

HENRY H. TALBOYS. I-IELMER E. ERICKSON.

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