US1683339A - Machine for reboring or refinishing cylinders - Google Patents

Description

5 Sheets-Sheet 1 Sept. 4, 1928.

B. J. FARR ET AL MACHINE FOR REBORING OR REFINISHING CYLINDERS Filed Sept. 15, 1924 Sept. 4, 1928.

V B. J. FARR ETAL MACHINE FOR REBORING OR REFIN-ISHING CYLINDERS Filed Sept. 15, 1924 3 Sheets-Sheet 2 I I lim Ill III- Sept. 4,1928. 1 1,683,339

B. J. FARR ET AL MACHINE FOR REBORING OR REFINISHI NG CYLINDERS Filed Sept. 15, 1924 s Sheets-Sheet 6 Patented Sept. 4, i928.

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BURT J. FAB/R AND MOSES H. NESTBROOK, 0F BATTLE CREEK, MICHIGAN.

MACHINE FOR REBOEING 0R BEFINISHING CYLINDERS. I

Application filed September 15, 1924. Serial No. 737,679.:

The invention relates to machinesfor reboring or refinishing cylinders.

In railroad practice, it becomes necessary from time to time to re-bore compressors, which usually include a steam-cylinder and an air-cylinder, and when the compressor is of the compound type. two steam cylinders and two air-compressors secured'to an intermediate frame. Heretofore, it has been 0 necessary, in re-boring or refinishing a cross compound air-compressor, to dismantle substantially the'entire compressor and to separate the cylinders from the intermediate frame and then separately and successively 5 re-bore them. it usually took from seven to twelve hours to accomplish this.

One object of the invention is to provide a machine for reducing the time'necessa-ry for the re-boring operation of a. compressor.

In re-boring these compound cylinders v it isimportant that the aligned cylinders should remain truly coaxial to prevent execsive Wear on the piston-rod packings and to insure the free operation of the pistons and rods in the cylinders, andanother object is to provide an improved ire-boring machine by which this 'coaxiality Will be insured. I

smother object is to provide machine for that purpose by Which the reboring operations can be easily and accurately-effected.

Other objects of the invention wvill appear fronrthe description i 1 lhe invention consists in the several novel features hereinafter setforth and more par-. ticularly defined by claims at the'conclusion hereof. I 1

In the drawings: 1 is a side elevation. Fig. 2 is an end elevation. .Fig. 3' is a detail of the gearing for driving" one pair of boring bars. Fig. at is a detail section'of-one of the guide bushings for the inner ends of the boring-bars. of said bushings. Fig. 6' is a 'plany'parts being shown in section. Figs. 7 andS are longitudinal sections on an enlarged scale through the ends of one of the boring-bars and associated parts. Fig. 9 is a section on line 9-9 of Fla. 8. Fig. 10 is a section on line 10-10 of Fig. 7. I

an improved Fig. 5 is a perspective of one The inventionis exemplified in connection with a lVestinghouse cross-compound: aircompressor comprising sure air-cylinder b and alow-pressure steam cylinder 0, which is coaxial with the high' pressure air-cylinder'd. Cylinders wand 0 are integrally formed and cylinders b and d are likewise. 'All of the cylinders are secured to an intermediate cast frame 0. 1 This cylintier-structure as exhibited, is of Wellknown construction, the cylinder-heads, pis tons and valve-mech anisms having been removed to provide access to the cylinders for re-boring. It is not necessary, however in the use of the machine to separate the cylinders from one another or from the connecting: frame. I

The invention is exemplified in a machine by which all four'of the cylinders of a cross-compound air-compressor of this type may be simultaneously bored or refinished. A table 1.0 supports the compressor, While itis being re-bored or refinished, and the cyl-' adapted to be secured to the cylinders in lieu of the pump flanges and cylinder-heads which hare been removed from the cylinders, prelin'iinary to re-boring the latter.

A boring-bar 20 has its outer end jour nalle'd inthe bearing 22 in frame 18 and is provided to rotate a' tool-carrier 24s in the cylinder (1. end journalledin bearing 21 of frame 18 and is n'ovided to operate a tool-carrier 24 m1 cylinder at. A. boring-bar 2O has its outer endjournalled in bearing 21 of frame it) and operates a rotary toolcarr1er 24 in the a high-pressure. steam-cylinder a, coaxial with a low-pres Table 10 is mounted on and fixed A boring-bar 20 has its outer His Inn

cylinder 7). A boring-bar has its outer end jo'urnalled in bearing 22 of frame 19 to operate a tool-carrier 24 in cylinder d.

The inner end of the boring- bars 20, 20 20, and 20 are journalled in bushings 23 re spectively which are usually formed of brass and are each secured to a screw-cap e which is adapted to be screwed onto the outer end of one of said casings. These bushings are split so as to be contractible by and tapered to fit, and are adapted to be inserted in the usual stufling-box casings e in frame 6 ofin connected relation to the head-frames.

The frames 18 and 19 comprise ring-portions which are provided with holes 26 which are adapted to register with the boltholes in the cylinder-structure of the compressor for the bolts which attach the cylinder-heads thereto, so that the frames 18 and fill 19 may be rigidly, detachably and quickly secured to the cylinders. In order to accurately support the outer end of the boringbars axially in the cylinders, tapped lugs 27 are formed on the frames 18and 19 for radial thumb-screws 28-, by which the supporting frames may be accurately adjusted to centrally position the boring bars in the cylinders. Frames 18 and 19 are recessed outwardly so that the tool-carriers at the beginning of an operation can be disposed outwardly of the cylinders so the tools will commence to cut at the outer .ends cylinders.

The boring-bars for cylinders a and b are aligned with each other and the bars for cylinders 0 and d are also aligned The inner end of each boring-bar is connected to its aligned bar by a coupling 29 which is provided with ribs 30 and 31 to enter recesses 32 in the bars respectively. This coupling forms a driving connection between the coaxial boring-bars so that one will be driven from the other.

Boring- bars 20 and 20 are driven from motor 16 and boring- bars 20 and 20 are driven from motor 15, by means of gearreductions which are similar in construction.

Each of said reductions comprises a pinion 33 on the motor-shaft; a gear 34, meshing with said pinion 33, and fixed to drive a pinion 35 which meshes with a gear 36; a

of the pinion 37 fixed to rotate with gear 36; and a gear 38 driven by pinion 37 and fixed to one of said boring-bars. Each of these gearings, with the exception of pinion 33, is enclosed in a housing which is composed of a flanged member 40 and a side plate 41 which are cross connected by spacer-bolts 42. Each housing supports one of these gearings and is pivotally held on the hub of gear-wheel 38 and is held against rotation by a fork 44 which is provided with slots 45 to receive studs 46 on the housing. Fork 44 is fixedly supported by the post 47 which is adjustably supported from one of the motor base-plates 14. The studs 46 can be swung out of'the slots 45, so that the head frames may be readily withdrawn from the cylinder structure.

Each toolcarrier comprises a hub 50, which is longitudinally slidable on one of the boring-bars and is caused to rotate therewith by a' block 51 which is slidably held in a slot 52 in the boring bar and is held and locked to said hub by a lug 54 fitting in a recess 55 therein and also by a screw 56. Each hub .50 is provided with arms 57 in which a boring or other suitable finishing tool 60 is adjustably held by any suitable or well known means in position to operate on the inner periphery of one of the cylinders. Each boring-bar is provided with a device for automatically feeding the tool longitudinally of the cylinder. This device comprises a spindle 61 which is provided with a screw 62 interfitting with a female thread 63 on the key-block 51 attached to one of the tool carriers; This spindle is driven from its boring-bar by a gear-train comprisinga pinion 64 which is fixed to rotate with the bar by a screw-thread 65; a double idler pinion 66, 67 mounted on a shaft 68; a pinion 69 looselyheld on the spindle 61; and a clutch-collar 70 which is connected by a spline and way 71 to the spindle, and has clutch-teeth interfitting with similar teeth on thepinion 69. Each shaft 61 is rotatable in its boring-bar and held against longitudinal movement by a shoulder 24 confined in a recess in said bar and held against outward movement by a washer 24 and the inner end of the hub of gear 64. Clutch-collar 70 is slidably movable into and out of engagement with pinion 69, so that whenever it is desired to position a tool-carrier in the cylinder independently of the automatic feed or retracted, it can be quickly done by disengaging the collar 70 from said pinion 69 and rotating the spindle directly by means of a crank 72 fixed to its outer end and independently of the gear train. A gear-housing 73 encloses'gears 64, 66, 67, and 69. Shaft 68 is mounted in a plate 74 which encircles the boring-bar with which it is associated. This plate is ill positioned against one of the sides of one of the gear-housings 4O, 41 by a collar 75, which is screw-threaded to the. outer end of the boring-bar. Lugs 6, secured to the housings respectively are each provided with a fork 77 which straddles one of the shafts 68 to hold the latter and the pinions thereon against bodily rotation with the boring bar and spindle therein. The shafts 68 for the feed mechanism for boring bars 20 and 20 are directly secured in frames 18 and 19 respectively. I

Each ofthese devices causes one tool-carrier to be fed inwardly in the cylinder while the bar is driven and exemplifies an automatic feed to move the tool longitudinally of the cylinder, which is removable with one of the boring-bars and head-frames, so that the feed-device, bar and frame will remainin connected relation, so they may be conjointly removed from and mounted on the cylinder-structure.

The operation of the improved machine will be as follows: When a cross-compound compressor-cylinder is to be bored, the compressor is removed from the locomotive and its heads, with the valvestherein and piston rods, are removed from the compressor, leaving the cylinders connected to the frame 6, so that the co-relation of the cylinders will not be disturbed, and the piston-rod packings and their followers are removed from the frame 6. The boring-bars are passed through the cylinders from the outer ends thereof respectively, and the frames 18 and 19 are accurately positioned by screws 28, so the boring bars will be. truly coaxial with the cylinders. Bushings 23 will be inserted in the packing-box casings in the frame 6, so that each boring-bar will have a bearing at its inner end in one of these bushings and in one of the head-frames 18, 19 at its outer end. The bolts for attaching the compressor-heads will then he used to secure the frames '18, 19 to the cylinder-structure. As the boring-bars are in serted into the cylinders from opposite ends, the couplings 29 will be placed between the contiguous ends of the aligned boring bars, so that one will be driven from the other. When the head-frames 18 and 19 are secured in operative position, the housings 10, ll, for the gear-reductions will be swung so their studs 16 will pass into engagement with the forks as on the stationary support will be disposed outwardly of the ends of the cylinders. l Vhenthe machine has been thus connected to the compressor, the motors may be singly or collectively operated under control of switches 15", 16. The boring-bars 20*, 20 will be driven to rotate the tools carried thereby-and bars 20 and 20 will be driven by couplings 29. Simultaneously, the tool-carriers will be, fed progressively inwardly, so that the entire area of the cylinders will be re-bored or .re finished during the instrokes of the tools. This feeding of the tools is effected by the rotation of the boring-barseach of which drives the screw-spindle 61 therein through pinions 64, 66, 67, 69 and clutch-collar 70. lVhen the cylinders have been thus re-bored or refinished, the clutch-collars 70 of the tool-feed devices can be disengaged from their pinions 69, so that the spindles 61 can be quickly retracted by cranks 72. Next, the housings a0, 41 are disconnected from forks 1 1 and the frames 18, 19 areremoved from the cylinders. Thereupon, the frames 18, '19 and mechanismscarried thereby can be removedfrom the cylinders and the lat ter can be removed for replacement.

In practice, it has been found that the time necessary. to re-bore the cylinders of a cross-compound air compressor can be per-1 formed in approximately two hours, while under prior practice, so far as knownto us, this work had required approximately from seven to twelve hours. The connections be-- tween the cylinders and the frame care not disturbed, so that their relative positions will not be disturbed and the gaskets between them will not be destroyed, which sometimes occurs in practice when the cylinders are individually bored in accordance with prior practice. -The invention also exemplifies a machine in which I the true coaxiality of the cylinders, which is necessary to prevent undue wear of the packing boxes for the piston-rods, isreadily attained,

because the longitudinally aligned cylinders I 5 are bored by coaxial tool-carriers. The.

machine can be operated so as to individually re -bore the c linders or may beused to i 7 a simultaneously re-bore two aligned cylinders or to simultaneously re-bore four of the cylinders. Certain features of the invention are susceptibleof use in connection with a compressor which comprises butone steameylinder and ,one'air-cylinder.

.The invention is not to be understood as restricted to the details set forth since these may be modified within the scope of the appended claims, without departing from th spirit and scope of the invention.

'Having thus described the invention, what we claim as new and desire to secure by Letters Patent, is: I i i 1. In mechanism for re-boring cylinders, the-combination of abase for supporting a cylinder to be bored, a frame adapted to be ihll removably connected to and supported by the cylinder, aboring-bar carried by the frame, a motor mounted on the base, driving means for the bar carried by the frame and shiftable as a unit into driving relation with the motor and a tool-carrier mounted on the bar.

2. In mechanism for re-boring cylinders, the combination of a base for supporting the cylinders to be bored, a pair of frames adapted to be removably connected .to and supported by the cylinders, a pair of boringbars carried by the frames a motor mounted on the base, driving means for the bars car ried by the frame and shiftable as a unit intodriving relation with the motor and toolcarriers on the bars.

3. In mechanism for re-boring cylinders, the combination of a base for supporting a structure comprising a pair of coaxial cylinders to be bored, a pair of frames adapted to be removably secured to and supported by the the outer ends of said cylinders, a pair of boring-bars carried by the frames respec tively in coaxial alignment and driven one from the other, tool-carriers. mounted on the bars, mechanism for driving one of said bars and means carried by each frame for automatically'feeding the toolcarrier on the bar which is carried thereby.

4:. In mechanismfor re-boring cylinders, the combination of a base for supporting a structure comprising a pair'of cylinders to be bored, a pair of frames adapted to be removably connected .to and supported by said cylinders, a pair of boring-bars carried by the frames, mechanism for driving one of the bars, and tool-carriers mounted on the bars, said bars being insertable with the carriers thereon into the cylinders from opposite ends thereof and driven one from the other.

5. In mechanism for re-boring cylinders, the combination of a base for supporting a structure comprising a pair of coaxial cylinders to be bored, a pair of frames adapted to be removably connected to and supported by the outer ends of said cylinders, a pair of boring-bars carried by the frames in coaxial alignment, mechanism for driving one-of the bars, and tool-carriers mounted on the bars, said bars being insertable wit-h the carriers thereon into the cylinders from opposite ends thereof and driven one from the other.

6. In mechanism for re-boring cylinders,

the combination of a base for supporting a' unitary structure comprising a pair of coaxial and spaced cylinders, a pair of frames adapted to be removably secured to and supported by the outer ends of said cylinders, a pair of boring-bars carried by the frames in coaxial alignment, tool-carriers mounted on said bars, mechanism for driving one of the bars, and a drive coupling between said bars and disposed inwardly of the cylinders, said coupling'being adapted'to permit the bars with the carriers thereon to be withposition. 7

11. In a re-boring machine of the characdrawn from the opposite ends of the cylinders. I

7. In mechanism for re-boring cylinders, the combination of a base for supporting a unitary structure comprising two pairs of coaxial cylinders to be bored, two pairs of boring-bars, the bars of each pair being driven one from the other and insertable endwise into the cylinders, a pair of frames,

each for carrying two of said bars, said fill each for carrying two of said bars, said frames being adapted to be removably secured to and supported by the opposite ends of the cylinders, tool-carriers mounted on the bars, mechanism for driving one bar of each pair of bars, and means carried by each frame for automatically feeding the carriers on the bars which are carried thereby.

9. In mechanism for re-boring cylinders, the combination of a base for supporting a unitary structure comprisingtwo pairs of coaxial'cylinders to be bored, two pairs of boring-bars, the bars of 'each' pair being driven one from the other and insertable endwise into the cylinders, frames adapted to be removably secured to and supported by the outer ends of said cylinders and by which the bars are carried, .toolcarrier's mounted on the bars, and means fordriving one bar of each pair of bars comprising motors mounted on the base.

10. In mechanism for re-boring cylinders, the combination of a base for supporting a cylinder to be bored, a frame adapted to be removably secured to and supported by the cylinder, a boring-bar carried by the frame, a tool-carrier mounted on the bar, a motor mounted on the base, and gearing for driving the bar from the motor, said gearing being mounted on the frame and pivoted toswing into engagement with the motor when the frame has beensecured in its operative ter described, the combination of a pair of supporting head-frames provided with means whereby they may be secured to the outer:

ends'of a pair of cylinders respectively, re-

bor'ing bars mounted in said frames insert-t able into the outer ends of the cylinders respectively, mechanism for driving one of the boring-barscomprising a motor and gearing, and a detachable connection in the gearllu ing for permitting the frame to be removed independently of the motor.

12. In a r'e-boring machine of the character described, the combination of a pair of supporting head-frames provided with means whereby they may be secured to the outer ends of a four-cylinder structure, a pair of re-horing bars mounted in each of said frames, insertable into the outer ends of the cylinders respectively, mechanism for '3 driving one of the boring-bars comprising a motor and gearing, and a detachable connection in the gearing for permitting the frame to be removed independently of the motor. Signed at Battle Creek, Michigan, this 28 day of August, 1924.

BURT J. FARR.

MOSES H. WESTBROOK.

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