US3028724A

US3028724A - Track press with pivotally mounted and adjustable work support

Info

Publication number: US3028724A
Application number: US838524A
Authority: US
Inventors: Reuben A Kaplan; Donald J Kaplan; Fred C Grabow
Original assignee: Owatonna Tool Co
Current assignee: Owatonna Tool Co
Priority date: 1959-09-08
Filing date: 1959-09-08
Publication date: 1962-04-10
Anticipated expiration: 1979-04-10

Description

April 10, 1962 R. A. KAPLAN ET AL 3,028,724

TRACK PRESS WITH PIVOTALLY MOUNTED AND ADJUSTABLE WORK SUPPORT 3 Sheets-Sheet 1 Filed Sept. 8, 1959 INVENTORS REUBEN A. KAPLAN DONALD J. KAPLAN FRED G. GRABOW ATTORNEYS April 10, 19 R. A. KAPLAN ET AL TRACK PRESS WITH PIVOTALLY MOUNTED AND ADJUSTABLE WORK SUPPORT Filed Sept. 8, 1959 3 Sheets-Sheet 2 5 mm 4. S H mam w l TA B E NKKA N E .R R WAJGM m ND T EL A v B A D MN NE E O 01% A ROI- 1% M -//h mm me hm n E. m

2 WW u n n m u T m:

April 10, 1962 R. A. KAPLAN ET AL 3,028,724

TRACK PRESS WITH PIVOTALLY MOUNTED AND ADJUSTABLE WORK SUPPORT Filed Sept. 8, 1959 I 3 Sheets-Sheet 5 FIG. 4

25 INVENTORS' REUBEN A. KAPLAN DONALD J. KAPLAN FRED c. GRABOW ATTORNEYS United States P n 3,928,724 TRACK WITH EIVOTALLY MOUNTED AND ADJUSTABLE WURK SUPPGRT Reuben A. Kaplan, Donaid J. Kaplan, and Fred C.

Grabow, flwatonna, Minn, assignors to Owatonna Tool Company, Owatonna, Minn, a corporation of Minnesota Filed Sept. 8, 1959, Ser. No, 838,524 9 Claims. (Cl. 59-7) This invention relates to new and novel improvements in track pin presses for assembling and disassembling the chains of crawler-type tractors. More particularly, this invention relates to an abutment removably secured to a track pin press casting for holding the cross members of a crawler-type tractor chain against transverse movement when a chain is being assembled and to improved table extension members for supporting elements of a chain as said chain is being advanced or retracted from an anvil of said track pin press.

This application is a continuation-in-part of our application Ser. No. 723,427, filed March 24, 1958, which is herein incorporated by reference.

In track pin presses of the prior art wherein there is provided a removable anvil for holding a portion of a chain against transverse movement and slide members for extending on either side of the anvil for supporting both sides of a chain in close proximity to the anvil, there is present the problem that if the anvil is secured to the track pin press frame so that it can be replaced with an anvil of a different width and/or differently spaced notches and the support members are not movable to a position clear of the anvil, then frequently said support members get in the operators way and make it very diflicult to replace the anvil. Further where the support members are fixedly positioned in a transverse direction relative to one another, if chains of a relatively large width are to be reconditioned, then the transverse dimension between the outer side edges of the slide members has to be of a correspondiug dimension. Similarly, if the chain is of a relatively narrow width, then the spacing between the support members is likewise small. Thus if a track pin press having support members fixedly mounted in a transverse direction relative to one another is to be used for reconditioning chains of varying widths, then the maximum width of the anvil usable with the press is limited by the smallest width chain to be reconditioned with the press. However in reconditioning chains of wider widths it is desired to use an anvil of a greater width to withstand the large force exerted against the anvil in reconditioning wider width chains. In order to overcome the aforementioned problems, the table extensions of this invention have been made.

Additionally in disassembling chains of relatively wide widths, if the rear abutment which is used for preventing the cross elements of a chain being moving in a transverse direction is fixedly joined to the track pin press frame, said abutment frequently hampers the disassembly of a chain, particularly where a sub-assembly of a pin and side piece are forced to move in a transverse direction to be disconnected from a second side piece and sleeve that was press fitted on the aforementioned pin. That is with the abutment mounted on the frame, after the press ram has forced the pin to move relatively to the sleeve and the second side piece a distance approximately equal to the transverse length of the small forcing pin of a disassembly fitting and the subassembly of a pin and a first side piece is not disconnected from the sleeve in which the pin is press fitted special structure has to be provided if the transverse length of forcing pins and the length of the ram stroke is to be kept relatively short. Otherwise the subassenrbly of the pin and first side piece has to be elevated ice.

to a position above the abutment and hand tools used before said sub-assembly of a first side piece and pin can be completely separate from the sub-assembly of a second side piece and sleeve; particularly with chains of wide widths since the abutment interferes with the pin'and side piece sub-assembly being moved in a transverse direction. To overcome the aforementioned problem the removable abutment of this invention has been provided.

It is an object of this invention to provide a new and improved removable abutment for preventing a pin and sleeve of a chain link from being moved in a transverse direction as said pin and sleeve are being simultaneously press fitted into a side piece. It is a further object of this invention to provide new and improved table extension members for supporting a portion of a chain as said chain is being advanced to a position to locate a side piece, a pin, and a sleeve of the chain, in position to be lowered into a track pin press anvil wherein further operations are performed on said chain, and for elevating a portion of a chain from said anvil after appropriate disassembly or assembly operations have been performed. It is an ad ditional object of this invention to provide in a track pin press new and improved table extension members that extend on'either side of an anvil and that are adjustably positionable to support chains of varying widths. It is another object of this invention to provide for a track pin press, table extensions that are rotatably supported in overhanging relation to the base of an anvil whereby said extensions may be readily rotated to a position out of overhanging relation with respect to the base of the anvil.

Other and further objects are those inherent in the apparatus herein illustrated, described, and claimed, and will i become apparent as the description proceeds.

To the accomplishment of the foregoing and related ends, this invention then comprises the features hereinafter fully described and particularly pointed out in the claims,

the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the invention may be employed.

This invention is illustrated in the drawings in which the same numerals refer to corresponding parts and in which:

FIGURE 1 is a plan view of one embodiment of the apparatus of this invention;

FIGURE 2 is a side clevational view taken in the direc tion of the arrows 2-2 of FIGURE 1;

FIGURE 3 is a fragmentary enlarged vertical sectional view taken along the line and in the direction of the arrows 3-3 of FIGURE 1;

FIGURE 4 is a fragmentary horizontal view of the workarea of the track pin press, and of a portion of the ram head equipped for a chain assembly operation, said view showing first embodiment of the table extension members of this invention;

FIGURE 5 is a longitudinal sectional view taken along the line and in the direction of the arrows 5--5 of FIG- I 1-3, inclusive, the first embodiment of the mechanism of the invention, generally designated 9, comprises the main base casting framework, generally designated 10, which is supported at a convenient work level by a subframe which includes angular end links 11, cross-frame members 12, and stringer l3. The main frame casting is set into the sub-frame and fastened thereto by bolts Patented Apr. '1 0, 1 962' appropriately spaced. The main frame casting has a central body portion 14 and

upstanding flanges

15 and 16 which are machined to have internally finished surfaces in which a crosshead, generally designated 17, is adapted to reciprocate back and forth. The crosshead IS a unitary casting having a hollow rear end portion l8 and ram end 19. The ram, during its course of re ciprocating movement, is guided against deviation from rectilinear movement by the machine surfaces on the main casting, and by a coverplate 20 which has an internally machined surface that engages corresponding machine surfaces of the ram crosshead. The rear end of the main casting has a cylinder head casting 21 which is attached to the main frame casting by through bolts 27. The cylinder head is machined to receive a cylindrical tube 24 of heavy section, and at the opposite end of the tube there is provided a cylinder head 25. The two cylinder heads and tube 24 are held together by long studs 26 and heavy nuts at one end of each stud. The complete cylinder is accordingly disposed in a hollow space 18 of the ram. In the ram adjacent the hollow space, a slot 28 is provided for passing one of the hydraulic lines 77 of the cylinder therethrough. A second hydraulic line '76 is connected to the opposite end of the cylinder.

Within the cylinder there is a piston 29 on the piston rod 33. The piston rod extends forwardly toward the ram so as to be attached thereto by internal stud 31. The internal stud extends entirely through the ram and is held in place by the collar nut 32. The collar nut is provided with a round outer end at 34 for centering the appropriately shaped pressing fittings on the ram, said fittings be ing mounted on the ram during various steps of the dis assembly and assembly operation.

The main casting extends forwardly beyond the ram through the space 35 and is provided with the horizontally bolting surface 36, terminating at a shoulder 37. Into the corner formed by

surfaces

36 and 37, and mounted upon the surface 36 is provided an anvil 38. The anvil is situated such that its rear surface abuts the surface 37, the latter surface absorbing the pressing force exerted on the anvil. The anvil which is positioned so as to occupy, approximately, the space between the side pieces of the chain is held down by bolts 39 extended through the anvil base 39C.

The anvil 33 is provided with a notch 33A and another notch SBB, said notches being spaced apart so as to readily receive the cross members of the chain which is being worked upon. The anvil and the

notches

38A, 38B formed therein preferably are of dimensions to sup- I port the members of a chain that are positioned in said notches in an elevated position above the table extensions when said extensions are in a horizontal position as shown in full line in FIGURE 2. The anvil is also preferably provided with a vertical notch 38D to permit the assembled portion of the chain to be moved more closely adjacent the ram than otherwise would be possible. That is when each of the side pieces corresponding to side piece NSI already has grousers attached thereto prior to assembling the chain, the notch 38D provides a space into which the adjacent end FSZ may be positioned in order to permit that end of the assembled portion of the chain to be moved more closely to the ram than otherwise possible. Thus provision is made for using an anvil that is for a substantial portion thereof of a greater width than if an anvil without a notch 38D were used for assemblying a chain wherein one side piece of each link was left attached'to a grouser plate. Since chains of different link widths and lengths may be handled by the equipment, there are supplied a suitable number of anvils 38 of different widths which have the spacing between the

notches

38A, 38B appropriate to the size of links of the chain being handled.

The main casting extends beyond the position of the anvil 38, for the most part through a generally horizontal plane, to the outer edge 42, there being a longitudinally extending keyway 43 formed in the main casting intermediate said outer edge and the anvil. A rear abutment 40, having a depending key 56 to form a matching fit with the keyway, is bolted to the casting by bolts 57. The rear abutment provides a vertical bolting surface &1 for receiving the various fittings which are applied to the mechanism for carrying out the assembly operation. The rear abutment has heavy transversely extending reinforcing members 59 located on the opposite side thereof from the bolting surface 41, said members resting on the main casting surface.

Rearwardly from the press main frame 10 there is provided a conveyor, generally designated 44, having a long section, only the end portion of which is illustrated. The section 45 is provided with a plurality of rollers 46 of suitable width for handling the chain that is being worked upon. A cable 47 is secured to the far end of the chain being worked upon and is brought under the chain and thence over the

pulleys

48 and 49 to the winch mechanism 50. The winch mechanism is contained in the table framework 51 which supports the delivery end of the conveyor.

The table 66, which is supported on the framework 51, is provided with a pair of longitudinally extending frame members 67 and a pair of cross frame members 68, 78 joined together to form a rectangular shaped slide frame 69. The slide frame is pivoted on the framework 5 by means of the bolt 53 so that the delivery end of the slide frame may be elevated relative to the work surface of the press. Welded to one of the longitudinal frame members 67 is a slide member 52 while a slide member 53 is welded to the other of the longitudinal frame members, said slide members being mounted in spaced relationship as illustrated in FiGURE 1. As may be noted in FIGURE 4, the slide members are shorter than the longitudinal frame members and as a result the forward end of each of the slide members is spaced from the cross frame member 53, said member 68 being located adjacent the work area. Mounted in the end portions of the longitudinal frame members intermediate the slide members and the cross member 6? is a shaft 70. The aforementioned shaft also extends through the longitudinally extending offset 71 which is secured to the cross member 63, said offset being located intermediate frame members 67.

Rotatably mounted on the shaft intermediate the offset 71 and frame member 67 and in abutting engagement with said offset and frame member is a sleeve 72 (see FIGURES 4 and 5). The table extension member 54 which has one end welded to the sleeve 72 is supported by said sleeve and the cross frame member 68 to form a continuation of the surface of the slide member 52.

Similarly a second sleeve 73 is rotatably mounted on shaft 70 adjacent the slide member 53, there being a table extension member 55 having one end welded to said sleeve to form a continuation of the slide member 53. A pair of collars 74 are mounted on a shaft to abut against either end of the sleeve 73 for holding the table extension member 55 in an adjusted transverse position on the shaft, there being set screws 75 for retaining said collars in said adjusted position. The

table extension members

54, 55 form a delivery end of the table. The extension members are shaped to reach around the anvil 38 in the work area of the press, there being an extension member located on either side of the anvil. The table extension member 55 has a notch 55A cut therein in the end portion adjacent the anvil but located on the opposite side of the extension member from the anvil. The purpose of providing the aforementioned notch will become apparent hereinafter.

The offset 71 has pivotally attached to it the clevis end 60 which is mounted on the end of the piston rod 61 of the hydraulic cylinder 62. The lower end of the cylinder is pivotally attached at 63 to a bracket 64 on the framework. When the hydraulic cylinder 62 is'operated in one direction, the piston rod 61 is pushed upwardly thereby raising the delivery end of the slide frame and the table extensio nmembers mounted thereon to the dotted line position illustrated in FIGURE 2 and when the cylinder 62 is operated so as to retract the piston rod 61, the aforementioned slide frame and members attached to the delivery end thereof are retracted to the full line horizontal position. When in the upper position, the chain, moving along the conveyor and stretching outwardly along the members 52-55 inclusive, as shown in FIGURE 2, is free to be moved along the conveyor and the table slide members without interference of the cross sleeves of the links with the anvil; but when the slide members are lowered to the position shown in solid line, the sleeves of the links of the chain arepulled in the

notches

38A, 38B of the anvil 38, and are supported in the notches.

Provision is made for moving the chain along link by link in either direction by hydraulic force appropriately applied. This is accomplished by providing hydraulic index mechanism generally designated 65. A detailed description of the operation and construction of the index mechanism may be found in our co-pending application Ser. No. 723,427.

A stop 80 is mounted on the table to extend across the spaceintermediate the

slide members

52 and 53 to form a rearward limit of the indexer stroke, while the. stop 81 extends across the aforementioned space and is secured to the

slide members

52, 53 to form the forward limit of the indexer stroke. Each of the aforementioned stops is composed of two plates held together by bolts 83. By loosening the bolts, the position of the stops may be varied and thereby be adjusted to accommodate links of different lengths, whereby the chain is indexed accurately to a position so as to drop the cross members of the chain into the anvil 38 when the slide members are lowered.

All of the operations of the press and the chain handling mechanism are accomplished by hydraulic means of the nature described in our co-pending application. The disassembly and assembly operations of the chain are accomplished by the main press cylinder 24, piston 39, and ram 19, actuated thereby. The raising and lowering of the chain is accomplished by a cylinder 62 which raises and lowers the delivery end of the slide frame members; and the conveying and chain indexing motions are accomplished by index mechanism which indexes the chain back and forward one link at a time.

The controls for the aforementioned mechanism'inelude a bell crank lever 84 arranged to be moved in the direction of the arrow 86 to cause the press main cylinder 24-450 to move in the corresponding direction as during the pressing operation, and when the lever is moved in the opposite direction 85, the piston 30 is likewise retracted in the opposite direction. The bell crank lever 87 is connected to appropriate mechanism for controlling the index mechanism. The bell crank lever 87 is mounted to be moved in a plane parallel to the longitudinal axis of the conveyor 45 and the slide members. When the lever 87 is moved in the direction of the arrow 89 it will cause the actuation of the index mechanism 65 to accomplish the movement of a chain in the retracted direction, but when the lever is moved in the opposite direction as in the direction of the arrow 88, the indexer mechanism moves the chain toward the anvil, namely in the direction of the arrow 88.

A third operating lever 90 is provided and is connected to appropriate mechanism for controlling the operation of the slide members 52-55. That is when the lever 117 is moved in the direction of the arrow 91 the cylinder 62 is actuated to raise the delivery ends of the slide member arrangement along with the chain thereon. When the lever is moved downwardly as shown by arrow 92, the cylinder 62 is actuated so as to lower the delivery end of the slide arrangement to a position shown in full lines in FIGURE 2.

The ram 19 is initially provided with a suitable fitting for engaging the track pins and sleeves, the shape of the fitting depending upon whether the track is to be disassembled, as during the track repairing operation, and then reass'embed, or whether the press is used in a' factory operation Where the parts are initially disassembled and are being initially assembled. During the disassembly operation, a ram is provided with the ram head fitting generally designated Q3 (see FIGURE 6) which is made up of a block 94, a small cylindrical forcing pin 95, and a large cylindrical forcing pin 96, said pins being secured to the block in the same spaced relationship as the pin and a sleeve press-fitted in the respective opposite ends of a side piece. The aforementioned fitting is secured to the ram by the stud 31 and nut 9'7, and is prevented from rotating since the fitting has a keyway 93 that forms a matching fit with the ram head key 99.

For assembly operations, the ram head fitting 93 is removed from the ram' head and the ram head assembly fitting :tiii? (see FIGURES 1 and 4) is mounted on the ram assembly in the same manner as the ram head pad 93 was mounted thereon. The ram head assembly fitting likewiseis made up of a block 101 having a slot which fits over the key of the ram head (said slot not being shown) and is secured to the ram head by members 31, 34, and 97. Mounted on the block 191 in the same spaced relation as the forcing pins '95, 96 on the block 94, are a small annular cylinder Ziild and a large annular cylinder 1597, said cylinders being secured to the block by bolts N5. Retractably mounted in each of the annular cylinders 1%, Hi7 and retained therein is a holding pin E08, 159, respectively, said holding pins being constantly urged to an extended position by springs (not shown) mounted within the respective cylinders.

In addition to fitting the ram head with the ram head assembly fitting 1% for the assembly operation, the rear abutment 4% is provided with an appropriate backstop fitting 115, the backstop fitting being of a similar shape and structure as that of the ram head fitting 93. That is the backstop fitting is made up of the block 116 that is held in position against the rear abutment by a bolt 1 17 Since the lower edge portion of the block 116 is shaped to form a matching fit with the shoulder 118 formed in the rear abutment, a single bolt 117 is sufficient to firmly hold the backstop fitting in position. A small adaptor pin 120 is secured to the block by the bolt 121 such that 7 its longitudinal axis will coincide with the line of the longitudinal axis of the small forcing pin of the fitting 1%; and the large adaptor pin 119 is likewise secured to the block by a bolt so thatthe longitudinal axis of pin 119 will coincide with the line of the longitudinal axis of the large forcing pin 109.

The transverse distance between thelinner vertical surface of the small adaptor pin-and the inner vertical surface of the small annular cylinder when the ram is in a press position is substantially equal to the longitudinal length of the pin of the chain to be worked on. That is, the dimensions of the ram head stroke and of the fitting used on the assembly are chosen such that when the ram head cylinder is in an extended position, the distance between the inner vertical face of the small adaptor head and the inner vertical face of the small'forcing pin is such that the side piece N51 will be properly forced into the position on pin P1 and at the same time the distance between the inner vertical face of the large adaptor pin and the inner vertical face of the forcing pin is such that the side piece N51 will be properly positioned on the sleeve S1.

On the area 35 of the metal casting, 'a combination gauging and support mechanism, generally designated 125, is mounted. The aforementioned mechanism includes a support plate 126 and a gauge support plate 127 which are adjustabiy positionable on a pair of spaced transspea /24 verse slide bars 128, said slide bars in turn being secured to the casting. The plates are adjustably positionable for different widths of links so as to allow said plates to be positioned to provide a fiat surface on which a link portion of a chain may be supported during the assembly operation of a link having a grouser thereon.

The first embodiment of the invention having been described, the second embodiment 140 will now be set forth. The structure of the second embodiment is substantially the same as that of the first embodiment except for the mounting of the slide extensions or table extensions, and therefore, for the most part, only the structure of the slide extensions and the mounting thereof, will be described.

Referring in particular to FIGURES 6 and 7, the second embodiment includes the main frame casting 10 having the same structure mounted thereon as previously described other than the rear abutment which is not illustrated in FIGURE 6, and the anvil 138 having notches 138A, 1388. The anvil other than not having a vertical notch is the same construction as anvil 38. The table 141 forms a slide surface for advancing and retracting a chain relative to the work surface 35 of the main casting. The table 141 includes a pair of spaced longitudinally extending frame members 142 and a pair of transverse cross frame members 143 secured together to form a generally rectangular frame (only one of each of the

members

142, 143, being shown). The cross frame member 143 located adjacent the main casting is an angle iron mounted in abutting engagement with the ends of the spaced table slide members 52, 53-. A transversely extending elongated slot 144 is formed in the horizontal leg of the frame iember 143. The slide extension 14:: is secured to the frame member 143 in an adjusted position by the pair of bolts 149 which are extended through the aforementioned slot and through one end of said slide extension member. Nuts 151 hold the bolts and slide member in an adjusted position. The extension 146 is provided with a notch 146A. A second slide extension member 147 is secured in a fixed position on the cross frame member 143 in abutting engagement with the adjacent end of the slide member 52 by bolts 151 By mounting the cross member 143 at a lower elevation than shown and welding a block to each of the extensions, provision may be made for countersinking said extensions and inserting the

respective bolts

149, 15%) in said extensions and blocks to secure the extensions to the member 143 and at the same time have a level top surface for the chain to slide on.

The description of the structure in both embodiments of our invention having been described, a brief description of the operation thereof will now be set forth. Assuming for purposes of explanation that a chain of one width and pitch has been disassembled and reassembled and now it is desired to use the track pin press for reconditioning a chain of a different pitch and a smaller width. In such an event it is necessary to remove the anvil 33 and replace it with another anvil having notches spaced a proper distance for the chain links to be supported by the anvil. Since the slide extension members overhang the work area adjacent to the anvil and the base of the anvil, the extension members impede the removal of the anvil from the main casting if said extensions are not removed from the table. By using the first embodiment of this invention, the

slide extensions

54, 55 may be pivoted on the shaft from a solid line position illustrated in FIGURE 5 wherein the extensions are supported on member 63 to the dotted line position illustrated in the same figure. When the slide extensions have been moved to the dotted line position, said extensions no longer obstruct removing bolts 39 which secure the anvil to the frame. In some cases it may be desirable to mount stops (not shown) on the framework 51 to limit the downward movement of the delivery end of the table, otherwise if the piston in cylinder 62 moves to low the extensions would be forced by the casting 10 to pivot on the shaft 70.

After a different anvil has been secured to the main casting, the transverse spacing of the

extensions

54, 55 is readjusted since the width W between the adjacent inner surfaces of the side pieces of the chain to be reconditioned is substantially less than the chain which was previously reconditioned on the track pin press. To properly position the

extensions

54, 55 relative to one another, the set screws 75 are loosened and the collars 74 moved to a position more closely adjacent to the offset 71 than that illustrated in FIGURE 4. By moving the aforementioned collars, the table extension 55 is moved toward the extension 54 and thus is properly positioned to support the respective side piece of the chain.

The notch 55A is provided since in some cases the setting of the extension 55 and the transverse length of the pin 12% are such that said pin would otherwise prevent the extension being rotated from the solid line position to the dotted line position illustrated in FIGURE 5 and/or would block the table being elevated to the posi tion illustrated in FIGURE 2.

if the

table extensions

146, 147 of the second embodiment are provided (see FIGURE 6) and it is desired to remove the anvil presently secured to the frame, the bolts 149, 156 may be removed to thereby disconnect said extensions from the table. Otherwise, by loosening the nuts on bolts 149, the extension 146 may be translated in the direction of the arrow 151 to a position transversely outward of the anvil base 138C. Then by removing the bolt most closely adjacent the slot 144, the extension 147 may be rotated in the direction of arrow 152 to a position out of overhanging relation with the anvil base. A ter the appropriate anvil has been mounted on the frame, the extension 147 may be rotated to its original position and the bolt 150 replaced. Now the extension 146 may be translated to a position to properly space said extension 146 from extension 147 and the nuts on bolts 149 tightened. The extension 14-6 is provided with a notched portion for reasons similar to those set forth for providing extension 55 with a notch.

In disassembling crawler-type tractor chains, particularly one of the relatively wide width, after the ram head has been operated to remove a side piece NS1 and to move the sub-assembly of a pin P1, side piece PS1, and sleeve S1 relative to the link L2 (of which S2 forms a member) to the position illustrated in FIGURE 6, and if the pin P1 is still tight in the sleeve S2, the side piece N31 is removed from the fitting and the ram is moved in the direction of arrow 151 as far as possible (as far as the adaptors or press travel will allow). If the pin is still tight in the sleeve, the ram is retracted, the rear abutment is removed, and the table is elevated. Now a pushing pin 155 of an appropriate size is insorted in the sleeve S2 to bear against the pin P1 (see FIGURE 6). Next the table is lowered to again position the sleeve in the anvil notch and the ram is operated to force pin 155 in the direction of arrow 151, said pin 155 in turn forcing the pin P1 out of the sleeve.

Normally the pin P1 is not tightly retained in the sleeve S2 after it has been forced to move a distance (in the direction of the arrow 151) approximately equal to the thickness T of a side piece and as a result upon elevating the table the subassembly P1, PS1, S1 may be moved transversely over the rear abutment. However, due to corrosion, bending of the chain elements, dirt intermediate the pin and sleeve, or etc., the pin may be tightly retained in the sleeve. In such an event it is preferable to remove the rear abutment and proceed as above described. If the rear abutment is not removed, it will frequently interfere with the ram and pin 155 moving the pin P1 a suiiicient distance to free said pin P1 from the sleeve. Also, it may be advantageous to remove the rear abutment from the main casting when a 9 the sub-assemblies of a pin, sleeve, and side piece are being disassembled.

Since the operation of a track pin press of the nature herein illustrated and described and the method of reconditioning a crawler-type tractor chain has been set forth in detail in our co-pending application, the operation of the press and the method of reconditioning a chain will not be further described.

It is to be understood that either embodiment of the table extension described herein may be used with a fixed abutment such as described and illustrated in our co-pending application or that the track pin press disclosed in our co-pending application may be made of a modified construction to be provided with any of the apparatus described in this application.

As many widely apparently different embodiments-of this invention may be made without departing from the spirit and scope thereof it is to be understood that we do not limit ourselves to the specific embodiments herein.

What We claim is:

1. In a track pin press for operating upon chains having a plurality of spaced transversely extending members, an anvil having at least one transversely extend ing notch formed therein for supporting at least one of said members, a ram mounted on the frame to one side of the. anvil for movement in a transverse direction to engage the supported transverse member, and means for retaining said one transverse member against movement in said transverse direction, said frame having a frame portion for mounting the retainer means, said frame portion being located on the opposite side of the anvil from the ram and at a lower elevation than said notch, said retaining means being removably secured to said frame portion, a longitudinally extending table mounted on the frame, said table having an end portion adjacent the anvil, transversely spaced extension members located on either longitudinal side of the anvil and forming a continuation of the table, means for attaching the table extension members to the table for permitting one of said extensions to be set in an adjusted position relative to the other, and means for moving said end portion of the table and extension attached thereto between an elevation lower than said notch and an elevation positioning said extensions above said anvil.

2. The machine of claim 1 further characterized in that the extension attachment means includes a shaft and a support, said extensions being rotatably mounted on the shaft to be selectively rotated to a position intermediate the anvil and the table and a position wherein they are supported by said support to extend on either side of the anvil when the elevating means is in a lowered position.

3. In a track pin press for operating on chains having a plurality of spaced transversely extending members, a frame, means mounted on the frame for supporting at least one of said members, a ram mounted on the frame to one side of the support means for movement in a transverse direction to engage the supported transverse member, a rear abutment removably secured to said frame on the opposite side of the support means from the ram, means removably secured to the rear abutment for abutting against the supported transverse member, said abutment having a shoulder forming a matching fit with a portion of said abutting means, longitudinally extending table means mounted on said frame for supporting at least a portion of a chain that is to be moved longitudinally relative to the support means, said table means including at least one slide member and a pair of spaced table extension members, said extension members extending in a longitudinal direction on opposite sides of the support means, said support means having a base portion underlying said extensions and. being bolted to the frame, one of said extension members being adjustably positionable relative to the other extension member and located intermediate the abutting means and the support means.

4. The machine of claim 3 further characterized in that the table means includes means for rotatably supporting at least one of the table extensions. 1

5. In a track pin pressfor operating on a chain made up of spaced side pieces and transversely extending mem* bers press fitted into apertures formed in the side pieces, a frame, a ram mounted on the frame for movement in a transverse direction, an anvil having at least one trans versely extending notch of a size to have a transverse member of said chain fitted therein, said notch being located in the path of movement of the ram in said transverse direction, a longitudinally extending table mounted on the frame, said table having an end portion adjacent the anvil, a pair of transversely spaced table extensions for forming a continuation of the table, and means mounting said extensions at an elevation lower than said notch for adjustably positioning the extensions relative to one another and relative to the anvil, said anvil having a base portion underlying at least one of the extensions and having a vertical notch on the opposite side of the anvil from the ram, said vertical notch being of a size to have one end of a side piece fit therein, said base portion being bolted to the frame.

6. Ina track pin press for operating upon chains having a plurality of spaced transversely extending members, a frame, an anvil removably secured to the frame for supporting at least one of said members, a ram mounted on the frame for movement in a transverse direction to engage said supported member, a longitudinally extending table mounted on said frame to support other members of the chain adjacent the anvil, said table having an end portion adjacent the anvil, transversely spaced table extension members movably attached to said table to form a continuation of the table for supporting members of the chain, said extension members extending on either longitudinal side of the anvil, and at least one of said extension members being transversely adjustable relative to the other extension memher.

7. In a track pin press for operating upon a chain having a plurality of spaced transversely extending mem bers, a frame, support means mounted on the frame for supporting at least one of said members, said support means including an anvil removably secured to the frame, a ram mounted on the frame for movement in a transverse direction to apply a pressing force against the member supported by the support means, longitudinally extending table means mounted on the frame for supporting a chain being worked on at approximately the same elevation as the ram, means including a pair of table extensions extending on either side of the support means and contiguous to said support means for supporting a chain for slidable movement between the table means and the support means, and means for mounting at least one of the table extensions for movement relative to the support means and the other table extension, said mounting means including a transversely extending shaft mounted in spaced relation to the anvil and also including means for supporting said movably .mounted table extension in a generally horizontal first position adjacent the anvil and for rotating said movably mounted table extension to a second position clear of the anvil in order to facilitate removal of the anvil.

8. In a track pin press for operating upon a chain having a plurality of spaced transversely extending members, a frame, support means mounted on the frame for supporting at least one of said transverse members of the chain, a ram mounted on the frame for movement in a transverse direction to apply a pressing force against the transverse member supported by the support means, longitudinally extending table means mounted on the frame for supporting a chain being Worked on at approximately the same elevation as the ram, means including a pair of table extensions extending on either side of the support means and contiguous to said support means for supporting a chain for slidable movement between the table means and the support means, and mounting means for mounting at least one of the table extensions for movement relative to the support means and the other table extension, said mounting means including a horizontal transversely extending mounting member and means for adjustably retaining said one extension in an adjusted transversely spaced position relative to the other extension, said transversely extending mounting member having an elongated transversely extending slot, said one table extension having a bolt aperture, and said adjustable retaining means including a bolt extending through the bolt aperture and the slot.

9. In a track pin press for operating upon a chain having a plurality of spaced transversely extending members, a frame, support means mounted on the frame for supporting at least one of said transverse members of the chain, a ram mounted on the frame for movement in a transverse direction to apply a pressing force against the transverse member supported by the support means, longitudinally extending table means mounted on the frame for supporting a chain being worked on at approximately the same elevation as the ram, means including a pair of table extensions extending on either side of the support means and contiguous to said sup port means for supporting a chain for slidable movement between the table means and the support means, and mounting means for mounting at least one of the table extensions for movement relative to the support means and the other table extension, said mounting means including a horizontal transversely extending shaft, and a collar adjustably positioned on the shaft, said one table extension being slidably secured to the shaft in abutting engagement with the collar.

References Cited in the file of this patent UNITED STATES PATENTS 1,054,557 Jensenius Feb. 25, 1913 1,946,911 Lindberg et a1 Feb. 13, 1934 2,268,225 Rodgers Dec. 10, 1941 2,545,560 Scott Mar. 20, 1951 FOREIGN PATENTS H 16,432 II Germany Dec. 15. 1955