US2618178A

US2618178A - Machine for boring pistons

Info

Publication number: US2618178A
Application number: US59728A
Authority: US
Inventors: Ewald A Arp
Original assignee: Tobin Arp Manufacturing Co
Current assignee: Tobin Arp Manufacturing Co
Priority date: 1948-11-12
Filing date: 1948-11-12
Publication date: 1952-11-18
Anticipated expiration: 1969-11-18

Description

NOV. 18, ARP

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 1 /N VE N TOR EWALD A. A/PP 5Y Hi3 A TZ'O/FWE) Nov. 18; 1952 ARP 2,618,178

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 2 M/I/E'NTOIP [WALD A/PP 8) 1! A TTORNEY Nov. 18, 1952 E. ARP

MACHINE FOR BORING PISTONS 5 Sheets-Sheet 3 Filed Nov. 12, 1948 Fleuf) /A/l f/V7'0/P [WA/.0 A. /PP amp-Haw A TTO/PNE'Y Nov. 18, 1952 E A 2,618,178

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 4 FIG. 5

lA/VE'NTOR [WALD A, APP

BY/v- MW A TTOENE) Nov. 18, 1952 E. A ARP MACHINE FOR BORING PISTONS 5 SheetsSheet 5 Filed NOV. 12, 1948 INVENTOR [WALD A. APP

NI W M y B H M m A Patented Nov. 18, 1952 MACHINE FOR BORING PISTONS Ewald A, All Minneapolis, Minn, assignor to Tobin-Arp Manufacturing Company, Minneapolis, Minn, a corporation of Minnesota Application November 12, 1948, Serial No. 59,728

21 Claims.

1 This invention has relation to a machine which has been devised to be especially useful'for boring the bearings of pistons, etc.

An object of the invention is to provide a machine for boring bearings; and particularly the bearings of pistons and articles or devices of like nature, which will be of novel and improved construction and designed to perform its intended service in novel and improved manner.

A further object is to provide a bearing boring machine wherein will be incorporated various desirable and improved features and characteristics novel both as individual entities of the machine and in combination with each other.

A further object is to provide a machine of the present character which will incorporate a novel and improved construction and arrangement for centering and alining with respect to each other bearings of articles, such as pistons, 'etc., to be bored and a boring bar with appropriate tool for operating on said bearings.

And a further object is to provide in the machineadjustable clamping units for supporting articles or devices bearings of which are to be bored which will be of simple, practical, efiicient, novel and improved construction.

With the above objects in view, as well as others which will appear as the specification proceeds, the invention comprises the construction, arrangement and combination of parts as no'w t'o be fully described and'as hereinafter to be specifically claimed, it being understood that the disclosure herein is merely illustrative and intended in no way in a limiting sense, changes in details of construction and arrangement of parts being permissible as long as within the spirit of the invention and the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. l is a top plan view of a machine made according to the invention;

Fig,'2 is an enlarged fragmentary vertical sectional view, taken substantially on line 2-4 in Fig. 1, detailing features at an upper portion of the machine and disclosing an adjustable clamping unit of said machine partially in section and partially broken away Fig. 3 is an enlarged fragmentary vertical sectional view, taken substantially on line 33 in Fig. l, detailing additional features at an upper portion of the machine;

Fig. 4 is an enlarged fragmentary vertical sectional view, taken on line 4.4 in Fig. 1;

Fig. 5 is an enlarged fragmentary vertical sectional view, partially in elevation and partially broken away, and with parts omitted, of an adjustable clamping unit and associated parts of said machine'the portions of the view which are in elevation being shown as they would appear from the position of line 44 in Fig. 1;

Fig, 6 is a fragmentary vertical sectional view, taken substantially on line 66 in Fig. '1, detailing features at a lower portion of the machine;

'Fig. '7 is a. detail sectional view of parts at the right lower side of the disclosure of Fig. 6;

Fig. 8' is a detail sectional view of parts at the left lower side ofthe disclosure of said Fig. 6, and

Fig. 9 is a detail sectional view taken as on line 94 in Fig. 2.

The machine of the present invention has been set up on a frame also supporting mechanism, denoted A at the left in Fig. 1 of the drawings, forming no part of the invention which this application presents. In practical operation, the machine including the mechanism. A and the machine herein illustrated and described have features in common in that they receive pressure fluid from a common source, are mounted upon a common frame work and are capable of being employedin connection with boring bar supporting units, disclosed at the right in said Fig. 1 and hereinafter described, also adapted tobe mounted upon the common frame Work. Stated otherwise, the frame It of the machine of the invention additionally supports mechanism A of a machine for accomplishing operations different from those herein set forth but capable of practical utilization On the same frame work in connection with devices or elements which are commcn to both' machines. Said frame II] is constituted as a rectilinear slab of rigid material, and can be supported in any suitable and convenient manner, as, for example, as part of a table, desirably so that the rectilinear slab will be horizontally disposed.

Spaced apart, parallel boring bar supporting units, indicated Hand l2, respectively are situated upon the flat upper surface [3 of the frame it for slidably adjustable movement in direction toward and away from each other, and said supportingunits H and I2 include self-alim'ng bearings, represented l4 and [5, respectively, which can be of construction as disclosedin my pending application. Serial No, 44,442, for Self-Alining Bearing, filed August 16, 1948, adapted to be situated in alined relation in a single, desirably horizontal, plane to be capable of selectively receiving a locating rod or mandrel l6, as in Fig. 1, or a boring bar with cutting tool (not shown). The

supporting units I I and I2 are keyed to the frame I3, as at I35, for slight rocking movement in a horizontal plane and fixed against movement in longitudinal direction.

The boring bar supporting unit II is constitituted as an elongated rectilinear member disposed in perpendicular relation to th frame II], as well as in perpendicular relation to a locating rod or mandrel, such as IE, or to a boring bar with cutting tool, when situated in the selfalining bearings I4 and I5. A flat lower surface I! of said boring bar supporting unit II rests upon the flat upper surface I3 of said frame III for slidable movement thereover toward and away from the boring bar supporting unit '12, a and lower portions of the boring bar supporting unit II are cut away to provide spaced apart slots I8, contiguous with said flat lower surface I! and parallel to a locating rod or mandrel or to a boring bar when in said self-alining bearings I4 and I5, including upwardly facing shoulders I9 for a purpose'to be made plain. Additionally, an upper portion of the boring bar supporting unit II includes spaced apart, horizontally disposed, longitudinally extending T'- slots 20, contiguous with a fiat interior surface 2| of said boring bar supporting unit II and perpendicular to a locating rod or mandrel or a. boring bar when in the self-alining bearings I4 and I5, as well as parallel with the frame I0, providing exteriorly facing shoulders 22 also for a purpose to be set forth. The fiat interior surface 2I likewise is perpendicular to a locating rod or mandrel or a boring bar when in said self-alining bearings I4 and I and to said frame I0.

The boring bar supporting unit I2 is constituted as an elongated rectilinear member disposed in perpendicular relation to the frame III,

portingunit 12 are cut away to provide spaced apart slots 24, contiguous with said flat lower surface 23 and parallel to a locating rod or mandrel, or to a boring bar, when in said selfi allning bearings I4 and I5, which contain supporting rollers 25 resting upon said fiat upper surface I3 for rolling or sliding movement of the boring bar supporting unit I2 toward and away from the, boring bar supporting unit Ii.

Also an upper portion of the boring bar supporting unit I2 includes spaced apart, horizontally disposed, longitudinally extending T-slots 26, contiguous with a fiat interior surface 2'! of said boring bar supporting unit I2 and perpendicular to a locating rod or mandrel or a boring bar when in the self-alining bearings I4 and I5, as well as parallel with the frame I9, providing exterior-1y facing shoulders 23 for the same purpose as are the exteriorly facing shoulders 22. The fiat interior surface 2! is disposed in parallel relation to the flat interior surface 2 I.

The machine incorporates a pair of duplicate adjustable clamping units, each represented 29,

and each clamping unit includes a clamping member 30.

, The'clamping members 38 are disposed in spaced, parallelrelation to each other between and in perpendicular relation to the boring bar supporting units II and I2, and each clamping out interior 34.

member is constituted as a housing which is of flat configuration in direction longitudinally of said boring bar supporting units and curvilinear at its upper portion and rectilinear at its lower portion. More explicitly stated, each clamping member or housing 30 includes a flat interior surface 3I, oppositely disposed, parallel, lower

rounded side surfaces

32, 32, a curvilinear upper side and top surface 33,and a hollowed The flat interior surface 3| is in perpendicular relation to the frame Ill and to the boring bar supporting units I I and I2, the

rounded side surfaces

32, 32 are in substantially parallel relation to the fiat interior surfaces 2I and 21 of said boring bar supporting units, and said

rounded side surfaces

32, 32 are provided by'spaced apart,

parallel side walls

35, 35, at the opposite ends f the hollowed out interior 34, in the instance of each clamping member or housing 33.

Each clamping member or housing 33 is assembled with end portions of the boring bar supporting units through the instrumentalityof horizontally disposed locking elements, represented 36 and 31, respectively, for movement of said clamping members or housings longitudinally of said boring bar supporting units, toward and away from each other. Th locking elements 33 and 3! of each clamping member are in alined relation and are disposed in the hollowed out interior 34 of the corresponding clamping member in perpendicular relation to its oppositely disposed

side walls

35, 33. More explicitly stated, each locking element 36 has its outer end portion snugly, slidably mounted inanopening through the side wall 35 of the corresponding housing adjacent the supporting unit I I and its inner end portion snugly, slidably. mounted in the adjacent end portion-of an opening through a fitting 33 rigid with said corresponding housingdisposed at the midlength of its hollowed out interior, and each locking element 3'! has its outer end portion snugly, slidably mounted in an opening through the side wall 35 of the corresponding housing adjacent the supporting unit I2 and its inner end portion snugly, slidably mounted in the adjacent end portion of said opening through the fitting 3B. The inner end portions of the locking elements 36- and 31 are hollow, and a compression "coil spring 39 in said inner end portions, between

cross pins

30, 40 rigidwith said locking elements,

normally urges the locking elements apart. A neck ill with head 32 rigid with the outer end of each locking element 36 lies in the T-slot 20 at the corresponding end of the supporting unit II, a neck 43 with head 44 rigid with the outer end of each locking element 3'! lies in the T-slot 26 at the corresponding end of the supporting unit I2, said necks-4| and 43 with heads constitute means mounting each clamping member upon the supporting units for movement along their longitudinally extending T slots, and the compression coil springs 39 normally retain the locking elements in position to permit the clamping members to be freely slidable along said supporting units toward and away from each other.

Each clamping member 38 suitably and conveniently supports a roller 33 at the midlength of its lower portion whichrests upon the flat upper surface I 3 of the frame Is in perpendicular relation to the corresponding clamping member and in parallel relation to the support ing units II and i2, and each clamping memher 3.0. also suitably and conveniently supports mechanism, situated within its hollowed out interior 314;, for causing th locking elements and 3:1 to be actuated to. cause, the. corresponding clampingmember and the supporting units H: and I2 to, be gripped together, with the flat androunded surfaces 2|, 32 and 21, 32, respectively, engaged, thus to cause the clamping members; and said supporting units to be locked together as a. unitary structure.

A horizontal cylinder 45 rigid with each clamping member or housing so, situated in its hollowed out interior 34. directly above and in spaced relation to its fitting 38, slidably supports spaced apart. pistons 41, 4.1 in its opposite end portions. A space within each cylinder 46, be,

tween the corresponding pistons 47, 41, is denoted 48, and a port leading to said space 48 is indicated 49.. Each piston 41 supports a neck 50, and packing surrounding the neck and em 'g-aged against. the body of the corresponding piston, as v well as against the interior surface of th corresponding cylinder 46, is represented 51. Fluid under-pressure, applied in a manner to be set. forth, within the spaces 48 of the cylinders; 45 is adapted to cause the pistons 41, 41 to be forcibly moved apart, and said pistons will be free for movement toward each other upon relief of the fiuid under pressure.

The outer ends of the pistons 41, 47 are engaged against the upper ends of longer arms 52, 5.2 of vertical actuating levers 53, 53 in the instance of each clamping member 30, intermediate portions of said vertical actuating levers are pivotally supported, as at 54, upon the corresponding clamping member, and lower end portions of

shorter arms

55, 55 of the vertical actuating levers are engaged against surfaces of the cross pins 40, of said corresponding clamping member which are opposite the compression coil spring 39. The construction and arrangement are such that the pistons 41, 41 will cause the

longer arms

52, 52 of the actuating levers 5.1, 53 to be moved apart with movement apart of said pistons in response to application of fluid under pressure to the spaces 48 of the cylinders 46, thus to cause the

shorter arms

55, 55 of said actuating levers and the locking elements 36, 31 to be moved toward each other, against resilient action of the compression coil springs 39,

said cylinders to cause the locking elements and shorter arms of the actuating levers to be moved apart and said

heads

42 and 44 to be released from said

shoulders

22 and 28.

The boring bar supporting unit II is adapted to be locked down against the flat upper surface (3 of the frame [0, thus to anchor 'said clamp.- ing members and supporting units to said frame, through the instrumentalityof vertically disposed locking elements 56 slidably mounted, as at 51, in the frame Ill. locking element 56 is disposed above the flat upsur-face I3 of said frame I!) in a slot [8, and a compression coil spring 58, upon each locking element 5 6 between a collar 59 thereon and said vflat upper surface l3, normally urges the corresponding locking element 56 upwardly A neck with head 6| rigid with the upper end of each locking element 56 lies in the .slot 18 at the corresponding end of the supporting unit H with said head GI above and said neck The upper end portion .of each 6 0 t n upwa y fa in sho lders 1/ 21? s id supp rt n u t l n id. ompres ion oil; springs 58 normally retain the locking elements 56, in position to permit the supportingunit H to be released from the flat upper surface 13 of the frame ID.

A vertical cylinder 52, in surrounding relation to the lower end portion of each vertically disposed locking element and rigid with the lower surface of the frame H3, slidably supports a piston 63 fixed, as at 64, upon said vertically dis-. posed locking element. A space within each cylinder 52, above the corresponding piston 63, is denoted 65, and a port leading to said space 5,5 is represented 66. Each piston 63 supports a neck 6i, and packing surrounding the neclg; and engaged against the body of the corresponding piston, as well as against the interior surface of the corresponding cylinder 62, is represented 68. Fluid under pressure, applied through a flexible hose 69, within the spaces 55 0f the. cylinders 62 is adapted to cause the pistons 53v to be. forcibly moved downwardly, and said pistons will be free for upward movement upon relief of the, fluid under pressure. The construction and arrange-.-. ment are such that the heads 6| will be moved downwardly with downward. movement of the pistons 53, against resilient action of the com-. pression coil springs 58, to be grasped against the shoulders I9, and said compression coil springs 58 will react upon relief of pressure in said cylinders c2 to cause the heads (ii of the locking ele..-.

Inents to be released from said shoulders I5.

Each adjustable clamping unit 29, includes a pushrod $8, of construction and assembled with the clamping member 38 of the corresponding adjustable clamping unit in a manner to be. de... scribed, and an operating lever H, of cons-truce tion and assembled with the frame it and the pushrod id of the corresponding adjustable clamping unit in av manner also to be described. The pushrod ll] of each adjustable clamping unit. is assembled with the clamping member 39, is disposed centrally of the flat interior surface 3! and extends exteriorly of said clamping member in perpendicular relation thereto, as well as in parallel relation to the frame l5, and the operating levers H of the

adjustable clamping units

29, 29 are disposed at opposite sides of said frame. More explicitly stated, intermediate portions of said operating levers ii are pivotally mounted, as at 72, upon opposite side portions of the frame it for swinging movement of the operating levers in a vertical plane parallel with the supporting units .II and i2 and perpendicular to the clamping

members

35, 35, upper arms 13 of said operating levers extend upwardly from the pivotal sup.- pcrts 32., and lower arms l4 of the operating levers extend downwardly from said pivotal sup: ports. Ihe upper end portions of the upper arms 5'3 are rotatably assembled with the pushrods ID in a manner to be made clear. The lowerends of the lower arms it are adapted to be forcibly moved apart, in response to application of fluid under pressure, to cause the clamping members 30 to be forcibly moved toward each other, and moved toward each other, upon relief of pressure, to allow said clamping members to be moved apart.

Mechanism for forcibly moving the lower arms 74, M of the operating levers vll apart includes a horizontal cylinder below the frame ifl'and pivotaliy connected, as at with the lower end of one of the lower arms '14, the one at the right in Figs. 6 and 7, and a horizontal connecting rod IT-alined with the horizontal cylinder :15 and pivotally connected, as at '18, with the'lower end of the other of said lower arms 14, the one at the left in Figs. 6' and 8. More explicitly stated, the horizontal cylinder I5 is closed at its outer end by a cap member 19 supporting spaced apart ears 80 to which the lower end of the lower arm It at the same side of the frame I!) is pivotally connected, and said horizontal cylinder is closed at its inner end by a cap member 8! which includes an annular opening 82 in which a sleeve 85 is rigidly sup-ported. Said sleeve 83 extends inwardly from the cap member 8| in spaced surrounding relation to the connecting rod 17, and the outer end of the sleeve is closed by a head 80 through which said connecting rod snugly passes and is slidably arranged. One end portion of the connecting rod H is rigidly secured, as at85, to a piston 86 slidably arranged in the horizontal cylinder 15, and a port Bl contiguous with a space 88'of said horizontal cylinder 15 at the side of the piston 89 opposite said connecting rod fl is for application of fluid under pressure to said space. The piston 86 supports a neck 69, and packing surrounding the neck and engaged against the body of the piston, as well as against the interior surface of the cylinder i5, is indicated 90. The other end portion of the connecting rod I1 adjustably supports, as at 9i, an attachment piece 92, and said attachment piece is pivotally connected to the lower end of the lower arm 74 at the corresponding side of said frame I0. A compression coil spring 93, on the connecting rod l! and in the cylinder ":5 and the sleeve 83, has one of its ends engaged against the piston 86 and its other end engaged against the head 84 normally to urge said connecting rod inwardly of said cylinder thus to urge the lower arms I4, 14 of the operating levers II, TI toward and the upper arms :3, I3 of said operating levers away from each other. it will be apparent that fluid under pressure applied to the space 38 of the cylinder 15 will cause the piston 86 and the connecting rod I? to be moved outwardly of said cylinder thus to cause the lower arms M of the operating levers II to be moved away from each other and the upper arms 73 of said operating levers to be moved toward each other, and that the compression coil spring 93 will cause said piston and connecting rod to be moved inwardly of the cylinder upon relief of pressure thus to cause said lower arms it! to be moved toward each other and said upper arms I3 to be moved away from each other.

Each pushrod I0 includes an external thread 94, and an actuator nut 95 is adjustably situated upon each external thread 94. Each actuator nut ,95 is of cylindrical configuration and each pushrod I0 passes transversely through the midlength of its corresponding actuator nut in such manner that the actuator nuts can be disposed with their longitudinal axes in a horizontal plane.

The upper end portion of the upper arm I3 of each operating lever II is out awayto provide spaced apart, upwardly opening concavities 96 alined in direction .parallelly of the clamping members 30, adapted selectively to receive a corresponding pushrod I0, and inwardly of said concavities said upper end portion of each upper arm I3 provides a downwardly and inwardly extending curvilinear surface 91 and a horizontal surface 98 against and upon which the corresponding actuator nut 95 is adapted to rest, as disclosed in Figs. 1 and 2 of the. drawings.

The obvious purpose of the severalv different alined concavitles is for setting pushrods Such as I0, 10 closer to or farther from the boring bar supporting unit II, depending upon the size of a piston or other device or article the bear- .ing of which is to be bored. With adjustment of said pushrods 10, I0 relative to said supporting unit II, the supporting unit I2 will be ad justed to correspond, closer to or farther from the supporting unit II, as the case may be.

Concavities 96 in the upper arms I3of operating levers H at opposite sides, respectively, of the frame I0 are in alinement in direction transversely of said frame and .parallelly of the supporting units II and I2, andothe construc tion and arrangement will be such that when said upper arms I3 are forcibly moved toward each other, the pushrods I0 and the clamping

members

30, 30 also will be forcibly moved toward each other in direction longitudinally of said pushrods, through the instrumentality of the upper end portions of the operating levers 'II and the actuator nuts 95. The construction and arrangement also will be such that when the lower arms 1-4 of the operating levers II are moved toward each other to cause the upper arms I3 of said operating levers to be moved apart, the pushrods and said clamping members will be free to have movement in direction away from each other.

The outer end of each pushrod I0 supports an actuator piece 99. Vertical plates I00 upon the interior surfaces of the upper arms 13, I3 of the operating levers TI include upper extensions IOI, each having concavities I02 alined withconcav ities 96, for precluding outward swinging movement of said upper arms to position clear of the actuator nuts 95. The .pushrods I0 lie in the ooncavities I02, and the upper extensions IOI preclude removal of said actuator nuts 95 off of the horizontal surfaces 98 with outward swinging movement of said upper arms I3, 13. Instead, said upper extensions IOI will engage the actuator nuts 95 with outward swinging movement of the upper arms 13, I3 and cause the pushrods I0 and the clamping members 30 to be moved away from each other.

"Rubber skirts se'curedto the vertical plates I00 and overlapping the opposite side marginal edge portions of the frame I0 are denoted I03. The end portion of each pushrod 10 opposite the actuator piece 99 includes a reduced cylind-rical portion I04 situated within the clamping member 30 of the correspondingclamping unit 29 and fixedly supporting an interior collar I05 engaged against an annular shoulder I06- of the pushrod. An external surface I01'of each interior collar I05 is of conical configuration and tapers in direction from the corresponding clamping member toward the corresponding pushrod. An exterior colla I08 is fixed, as at I09, to a cylindrical internal surface of the corresponding clamping member bounding a chamber I I0 which said corresponding clamping member provides. An internal surface III of each exterior collar I08 is of conical configuration and tapers in direction from the corresponding clamping member toward the corresponding pushrod, and the external surface I 01 of each interior collar m5 is slidably fitted against "the internal surface III of each exterior collar I08. A look plate II2 engages the exterior collar I00 and a retainer plate II 3, secured "against the ad acent surface of the corresponding clamping member as at H4, secures each lock plate in its 9 intended position. The construction and arrangement are such that the interio collar I05 on each pushrod I will rock in the corresponding exterior collar I08 in a horizontal plane but will be fixed in said corresponding exterior collar against rocking movement in a vertical plane.

Each p-ushrod I0 is hollow, as indicated at H5, and a connector I I6 for fiuid under pressure pens to the hollow interior or each pushrod, denoted at III.

A stub end H8 in each chamber H0 is rigidly fitted, as at II9, into the adjacent open end oi the corresponding pus'hrod I0, and a port I20, contiguous with the interior of said corresponding pushrod, through each stub end, is open, as at I2I, to an external surface of the stub end in remote relation to the corresponding pushrod.

Each chamber I I0 houses a clamping plug I22 which is fixed in the corresponding clamping member 30 and is disposed in spaced, adjacent relation to the end of the corresponding stub end H8 opposite the corresponding pushrod I0. A rounded closure wall I23 of each clamping'plug I22 protrudes beyond the flat interior surface 3| of the corresponding clamping'member 30, and the body of each clamping plug is hollow and is fitted, as denoted at I24, in said corresponding clamping member in spaced, surrounding relation to the corresponding stub end H8 and pushrod I9. A compression coil spring I25, within each chamber I I 0 upon the corresponding stub end and pushrod, has one of its ends engaged against the corresponding interior collar I and its other end engaged against the corresponding clamping plug I22 normally to urge said interior collar inwardly of the corresponding clamping member 30. An internal annular shoulder I26 of each clamping member 30 is engaged by an external annular shoulder I21 upon the corresponding clamping plug I22, and each compression coil spring l normally retains the corresponding interior collar I05 seated in its corresponding exterior collar I09, with the outer part of the corresponding stub end H8 in spaced, adjacent relation to the corresponding clamping plug, as disclosed in Fig. 2 of the drawings. A port I28 in each clamping plug I22 affords passage for fluid under pressure from the port I2I of the corresponding clamping unit to the port 49 leading to the corresponding chamber 48. Packing about each stub end H8 and engaged with an internal surface of the corresponding clamping plug I22 provides a compartment I30 within said corresponding clamping plug surrounding the corresponding stub end I I8 and isolates the ports I2I and I28 from the corresponding chamber I I0.

In the accomplishment of practical operation of the machine, the boring bar supporting units I I and I2 will be set up on the frame I0 in spaced relation to each other a distance apart slightly greater than, or approximately equal to, the distance apart of the rounded side surfaces 32, 32 of each clamping member 30, and the supporting unit II will be fastened down on the frame I0 in the manneras hereinbefore set forth. A device or article a bearing of which is to be rebored, such as a piston I35, disclosed in Fig. 1 of the drawings,

will be placed between said supporting units, and a locating rod or mandrel, such as I6, will be inserted in and through the self -a'lining bearing I4, said device, article or piston and the self-alining bearing I 5, as in said. Fig. 1. Thereafter, the clamping units 29 will be actuated to cause the clamping members 30 to grasp oppositely dis posed surfaces of the device, article or piston.

Supposing the device or article a bearing of which is to be rebored to be a piston, said piston will be situated so that its longitudinal axis is disposed in a plane parallel to the frame I0 with the closed end of the piston adjacent one of the clampingmembers 30and the open end of said piston adjacent the other of said clamping members 30, and with the piston so situated, fluid under pressure will be applied to the space 88 of the horizontal cylinder I5. The lower arms I4, I4 of the operating levers l I, II will be forcibly moved away from each other in response to application of pressure fluid to said space 88 thus to cause 'the upper arms I3, I3 of said operating levers, and hence the pushr'ods 10, I0 and the

clamping'members

30, 30, to be forcibly moved toward each other. The flat interior surface 3| of the clamping member 30 which the open end of the piston is adjacent will engage said open end, and the rounded interior surface of the closure wall I23 which the closed end of the piston is adjacent will engage a central portion of said closed end.

The exterior collars I08 will engage the interior collars I05 in such manner as to retain the clamping members 30 fixed in a vertical plane but free to rock ina horizontal plane while the clamping plugs I22 and the fiat interior surfaces 3| become engaged with oppositely disposed surfaces of a device or article such as the piston I35. Upon application of force to the clamping members 30, tending to move one of the clamping plugs and one of the clamping members, inward movement of said clamping members will be arrested by the device, article or piston. Instead, the pushrods 10 with stub ends II8 move in-' wardly of the clamping members 30, against resilient action of the compression coil springs I25, until said stub ends are engaged against the clamping plugs I22 and the interior collars I05 are released from the exterior collars I08 and situated at the side thereof adjacent said clamping plugs. The construction and arrangement are such that when said interior collars are released from said exterior collars, the clamping plugs I22 and the clamping members 30 will be supported upon annular shoulders of the stud ends II8 just inwardly of the packings I29 for universal rocking movement. Upon the application of force to the clamping members 30 and the clamping plugs I22 causing them to be pressed against a device, article or piston, said clamping members will be capable of rocking in universal direction relative to said device, article or' piston with the result that the clamping members and clamping plugs will exert retaining pressure against opposed surfaces of the device, article or piston in direction longitudinally thereof and apply no force tending to impart rocking move I The merit to said device, article or piston. clamping members 30 will be held substantially vertical by cooperation of the interior and exteri'o'r collars I05 and I08 when engaged and the annular shoulders disposed inwardly of the packings I29. The compression coil springs I25 will be of sufiicient strength to level the work, such as a piston, tobe bored. As will be apparent from Fig. 9, the internal surfaces III will be in clearing relation to the external surfaces I07 at their opposite sides and engaged with said external surfaces at their tops and bottoms when,

the internal and external collars I05 and I08 are in engagement so that the clamping; members 30 can rock in a horizontal plane relative to the work or piston. At the same" time, said internal" and external collars cooperate to maintain the clamping members in vertical position while the work or piston rocks in a vertical plane, about the locating rod or mandrel I 6, relative to said clamping members. When the pushrods I move the clamping members into engagement with a piston, the piston is rotated on its locating rod or mandrel to become engaged either by a fiat interior surface 3I or :a rounded closure wall I23, as the case may be. Upon removal of the interior collars I05 from the exterior collars I08, the lannular shoulders disposed inwardly of the packings I29 maintain the clamping plugs I22, and hence the clamping members 30, snugly supported upon the stub ends II8 but permit said stub ends to slide within said clampin plugs. The outer portions of the stub ends are somewhat rounded, and the construction and. arrangement asillustrated and. described is provision for universal rocking movement of the clamping members when the interior and exterior collars I05 and I08 are disengaged. Thus, said clamping members are adapted to take their final alinement from the piston.

It will be apparent that the clamping members and clamping plugs will be actuated in response to fluid under pressure to cause the opposite ends of devices orarticles to be rebored :to be engaged with equal pressure and so that there will be no distorting pressure applied to the locating elementor rod.

The supporting units II and I 2 will be grasped to the clamping

members

30, 39 after said clamping members have been gripped against oppositely disposed surfaces of a device or article a bearing of which is to be rebored. Fluid under pressure for actuating the pistons 41, 41 is applied to the space 48 of the cylinders 46 by way of the connectors IIB, thehollow interiors ofthe pushrods ID, the ports I and I2I in the stub ends II 8, the compartments I30, the ports I28 in the clamping plugs I22, the chambers I II] and the ports 49. The self-alining bearings I4 and ,I5'will permit rocking movement of the supporting units II and I2 in universal direction relativeto said seli-alinin bearings during the operation of lockingsaid supporting units to said clamping members, so that securing the supporting units up againstthe clamping members will have no tendency toward displacing the set relation of said clamping members with respect to a retained device, article or piston. And, too, the supporting unit- I2 is pulled toward the supporting unit -II in direction longitudinally of the locating rod or mandrel so that there is no tendency toward disalinement.

I The locking elements 36 and 37 will be actuated in response to fluid under pressure to cause the supporting units II and I2 to be engaged against the-clamping members 30, with equal pressure. r

. Pressure of fluid in the spaces 48 of the cylinders 46 and in the space 88 of the cylinder 15 will be relieved when a device or article is to be removed from the machine, and another device or article the bearing of which is to be rebored can be located in the machine by repetition of the operations hereinbefore described.

In an instance when a device, article or piston having a bearing to be rebored is of shape other than flat at onev of its ends, as for instance when a piston has an irregularly shaped closed end, the machine can incorporate special means for supporting the device, article or piston. As disclosed, one of theclamping members 30 detachably sup- 12 ports, as at I3I, a disc element I32 disposed for} wardly of and in spaced relation to the fiat in terior surface 3i. disc element is cut away to be in clearing relation to the corresponding clamping plug I22, and the body of the disc element retains, through the instrumentality of clips I34, spacing screws I33. The heads of the spacing screws are situated be.- tween the disc element and the clamping member .and the bodies of said spacing screws terminate in unequally spaced relation to said clamping member. In an instance when employed, the

spacing screws I33 will engage the device, article or piston to be rebored, in lieu of the flat interior surface 3 I.

It will be understood of course that the locat{ ing rod or mandrel, such as I5, will be removed from a device or article having a bearing to be rebored after said device or article is set up in the machine, and a boring bar with appropriate cutting tool will be set up in the bearings of the supporting units II and I2 and actuated to accomplish a reboring operation upon the bearing of the device or article.

What is claimed is:

1. In a machine for centering and alinlng with respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined bearings upon said supporting units,'respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart clamping units between and slidably assembled with said supporting units mounted for movement toward and against said oppositely disposed surfaces of said 7 article and the supporting units engaged against opposed surfaces of each of the clamping units.

2. In a machine for centering and alining with respect to each other the bearing of an article" to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined bearings upon said supporting units, re? spectively, adapted to removably receive a boring bar'locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart clamping units between and slidably assembled with said supporting units mounted for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, means for actuating said clamping units into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, means for releasably securing said supporting units and clamping units in fixed relation to each other with the clamping units engaged against said oppositely disposed surfaces of said The central portion of said article and the supporting units engaged against opposed surfaces of each of the clamping units, and means for releasably securing said supporting units in fixed relation to said frame.

3. In a machine for centering and alining with respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart, parallel supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart, parallel clamping members between, slidably assembled with and perpendicular to said supporting units mounted for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, means for actuating said clamping members into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said 10- cating element in spaced relation to said supporting units, and means for releasably securing said supporting units and clamping members in fixed relation to each other with the clamping members engaged against said oppositely disposed surfaces of said article .and the supporting units engaged against opposed surfaces of each of said clamping members.

4. In a machine for centering and alining with respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart, parallel supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart, parallel clamping members between, slidably assembled with and perpendicular to said supporting units mounted for universal rocking movement and for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, means for actuating said clamping members into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, and means for releasably securing said supporting units and clamping members in fixed relation to each other with the supporting units engaged against opposed surfaces of each of the clamping members.

5. In a machine for centering and alining with respect to each other the bearing of an article .to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart, parallel supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart, parallel clamping members between and perpendicular to said supporting units mounted upon the supporting units for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of. movement, means for actuating said clamping members into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, and means for releasably securing said supporting units and clamping members in fixed relation to each other with the clamping members engaged against said oppositely disposed surfaces of said article and the supporting units engaged against oppositely disposed surfaces of each of said clamping-members.

6. In a machine for centering and alining with respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart, parallel supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart, parallel clamping members between and perpendicular to said supporting units mounted for universal rocking movement and for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, means for actuating said clamping members into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, means for releasably securing said supporting units and clamping members in fixed relation to each other with the clamping members engaged against said oppositely disposed surfaces of said article and the supporting units engaged against oppositely disposed surfaces of said clamping members, and means for releasably securing at least one of each of said supporting units in fixed relation to said frame.

'7. In a machine for centering and alining with respect to each. other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart clamping units between said supporting units mounted for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, hydraulic means for actuating said clamping units into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, hydraulic means for releasably securing said supporting units and clamping units in fixed relation to each other with the supporting units engaged against opposed surfaces of each of the clamping units, and means for releasably securing said supporting units and clamping units to said frame.

8. In a machine for centering and alining with respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart, parallel supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for inser- '15 tion through the bearing of said article while situated between said supporting units, spaced apart, parallel clamping members between and perpendicular to said supporting units mounted for universal rocking movement and for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, hydraulic means for actuating said clamping members into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said supporting units, hydraulic means for releasably securing said supporting units and clamping members in fixed relation to each other with the supporting units engaged against opposed surfaces of each of the clamping members,

and hydraulic means for releasably securing said supporting units and clamping members in fixed relation to said frame.

9. In a machine for centering and alining with I respect to each other the bearing of an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably receive a boring bar locating element for insertion through the bearing of said article while situated between said supporting units, spaced apart clamping units between and upon said supporting units mounted for universal rocking movement and for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, means for actuating said clamping units toward each other into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating ele ment in spaced relation to said frame and said supporting units, and means for releasably securing said supporting units and clamping units in fixed relation to each other with the supporting units engaged against opposed surfaces of each of the clamping units.

10. In a machine for centering and alining with respect to each other the bearing of .an article to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined self-alining bearings upon said supporting units, respectively, adapted to removably re-' ceive a boring bar locating element for insertion through the bearing of said article While situated between said supporting units, spaced apart clamping units between and upon said supporting units mounted for universal rocking movement and for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement, hydraulic means for actuating said clamping units toward each other into releasably engaged relation with oppositely disposed surfaces of said article while the article is upon said locating element in spaced relation to said frame and said supporting units, hydraulic means for releasably securing said supporting units and clamping units in fixed relation to each other with the supporting units engaged against opposed surfaces of each of the clamping units, and means for anchoring said supporting units and clamping units to said frame.

11. In a machine of the character described, a frame, supporting units mounted on said frame for movement toward and away from each others, a clamping member between said supporting units, locking elements upon said clamping member in opposed relation to each other and havin outer portions thereof situated at oppositesides of the clamping member and slidably disposed in longitudinally extending slots in said supporting units, resilient means normally retaining said locking elements in released engagement relative to said supporting units, and means for actuating said locking elements against force of said resilient means to cause said supporting units to. be fixedly secured to and against said clamping member.

12. In a machine of the character described, a frame, supporting units mounted on said frame for movement toward and away from each other and having longitudinally extending T-slots, a clamping member between said supporting units, locking elements in alined relation upon said clamping member and having outer portions thereof slidably disposed in said longitudinally extending T-slots, resilient means between and normally urging said locking elements apart and in released engagement relative to said supporting units, a cylinder upon said clamping member, spaced apart pistons in said cylinder, and actue ating levers having intermediate portions thereof pivoted upon said clamping member, first end portions thereof engaged with said locking elements and second end portions thereof engaged against outer end portions'of said pistons, there being a space in said cylinder for receiving fluid under pressure adapted to cause said pistons to be forcibly moved apart thus to operate said actuating levers to forcibly move said locking elements toward each other to cause said supporting units to be fixedly secured to andagainst said clamping member.

13. In a machine of the character described; a clamping member having a chamber, 'a-gpushrod secured to said clamping member and having an internal passageway contiguous with said chamber, a cylinder upon said clamping member,..and spaced apart pistons in said cylinder, there being a space in said cylinder for receiving fluid under pressure adapted to cause said pistons tobe forcibly moved apart, and there being a port between said chamber and space for' passage of fluid under pressure from the internal passageway of said pushrod and said chamber into said space.

14. In a machine of the character described, clamping members in spaced apart,. alined'relation having interior surfaces situated opposed, substantially parallel relation, alined pushrods extending exteriorly from said clamping members, respectively, at the exterior sides thereof, clamping plugs in said clamping members at the interior sides thereof in overlapping relation to said pushrods and constituting 'means for mounting the clamping members upon the pushrods for universal rocking movement, means each constituted as an exterior and an interior collar securing said clamping members upon said pushrods for rocking movement of the clamping members in a horizontal plane and precluding relative movement of the pushrods and 'said clamping members in a vertical plane, and a resilient member normally urging the exterior and interior collars of each of said clamping members into engaged relation, movement of said pushrods in longitudinal direction toward said clamping members being adapted to release said interior collars from said exterior collars against the ac-- tion of said resilient members thus to cause the clamping plugs to constitute means mounting the clamping members upon the pushrods for universal rocking movement.

15. In a machine of the character described, a frame, spaced apart supporting units mounted on said frame for movement toward and away from each other, alined bearings upon said supporting units to removably receive a boring bar locating element for insertion through the bearing of an article to be bored, spaced apart clamping units between said supporting units mounted for movement toward and away from each other in direction transversely of the direction in which said supporting units are capable of movement to be releasably engaged against opposed surfaces of said article while upon said locating element in spaced relation to said supporting units, and means assembled directly with the supporting units and clamping units for releasably securing said supporting units against opposite surfaces of each of said clamping units while engaged against said article and in fixed relation to said frame.

16. The combination as specified in claim wherein said clamping units are mounted for uni versal rocking movement.

17. The combination as specified in claim 15 wherein said clamping units are mounted upon said supporting units for universal rocking movement.

18. The combination as specified in claim 15 wherein said means includes locking elements upon each of said clamping units disposed in slots in each of said supporting units.

19. In a machine of the character described, a frame, spaced apart operating levers having intermediate portions thereof mounted on said frame for swinging movement of first and second arms, respectively, of said operating levers toward and away from each other, means for forcibly moving the second arms of said operating levers in direction away from each other thus to move the first arms of said operating levers toward each other, alined pushrods having intermediate portions thereof assembled with the first arms of the operating levers for longitudinal adjustment of the pushrods in the plane of swinging movement of said first arms and for rocking movement of said pushrods, and spaced clamping 18 members supported upon said pushrods in alined relation therewith and disposed between the first arms of said operating levers.

20. The combination as specified in claim 19, means securing each of said pushrods to its corresponding clamping member, and means for ac complishing longitudinal adjustment of said pushrods constituted as an external thread on each pushrod and an actuator nut on each external thread rotatably assembled with one of said first arms.

21. In a machine of the character described, a frame, supporting units mounted on said frame for movement toward and away from each other, a clamping member between said supporting units, locking elements upon said clamping member in opposed relation to each other and having outer portions thereof situated at opposite sides of the clamping member and disposed in longitudinally extending slots in said supporting units, resilient means normally retaining said locking elements in released engagement relative to said supporting units, and means for actuating said locking elements toward said clamping member against force of said resilient means to cause the supporting units to be fixedly secured against opposed surfaces of the clamping member.

EWALD A. ARP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number. Name Date 1,462,742 Davis et al July 24, 1923 1,582,639 Cullen Apr. 27, 1926 1,589,085 Andersen et al. June 15, 1926 1,751,708 Neller Mar. 25, 1930 1,896,059 Wainwright Jan. 31, 1983 1,898,285 Blauvelt Feb. 27, 1933 2,011,877 Shafi Aug. 20, 1935 2,129,485 Zimmerman Sept. 6, 1938 2,162,133 Spire June 13, 1939 2,248,998 Johnson et a1. July 15, 1941 2,290,106 Longstreet July 14, 1942 2,341,602 Dewey Feb. 15, 1944 2,389,526 Maulding Nov. 20, 1945