US1986493A - Portable press - Google Patents

Description

. 193.5- J. H, ABRAMSON ET AL 1,986;493

PORTABLE iRESS Filed May 9, 1932 5 Sheets-Sheet l Jan. 1, 1935. J. H. ABRAMSON r AL PORTABLE PRES S Filed May 9 1932 3 Sheets-Sheet 5 8 0 3 H u M z 7 m 3 9 n 9 u 1 i n u a W 1 w M%\ 1 5 1 W m f J wv( Z]; gg v k 25 through th operatiombecomms badly Fig. 4 iso fragmentary view showing the man- PatentedJan. 1,193s I 1,986,493

umreo STATES; PATENT OFFICE l mom a i a ,JohnQHei-b'ertAbrammn'ind'EdwinC. Swanson, H Rock1f0rd,,m',, ,assignorgtoGrcenlec, Bros. &

G0,; Roekijord, 111., a. corporation.- Illinois 1 appuosuon- May '9, 1932', serial No. 610,296

comma. (ciao-as) This invention relates to mechanism especially I Another object of the invention is the proviadapted for use in removing and inserting the sionof hydraulically operated means for pushing pins and bushings of tracks, such as used in the pins and bushings of a tractor. crawler type tractors. a We have also aimed to provide improved The individual shoes-oi the tracks'ior crawler means for holding the track whilethe pins and type tractors are held together bymeans of bushings are being pushed and for guiding the and bushings, which are'irictionally held in same during the pushing operations. pl y are s m led, whenmanuiaetui'ed. A further object of the invention is the proviby forcing the pins and bushings into position. sion of portable mechanism which may be supunder extreme pressure, in the region of fifty ported upon'the track for the removal of the tons. When these tractors go'out into use it is same {mm the tractor. q n y necessary to r pel the tr in th We have also aimed to provide improved means field and considerable .dely e pen are 'ior positioning the mechanism with respect to occasioned if it is necessary to return the tractor th track for the pushing operation. a

t0 e manufacturer f r r p In the P i Otherv objects and attendant advantages will 15 repair o the e n fi d, has e e become apparent to those skilled in theart as n wi h h re te t dim ultyjdile th the following description proceeds and from the treme pressure under which the pins and the ac om anying drawings, in whichbushings are inserted. The only tools available Figure 1 1 a, top view of the machine sein h -fi f r th r ve-In these p r h cured to a track in a position to remove a pin been a punch and a; sledge. The operationhas therefrom; r quired two men, on o h th P and Fig. 2 is a verticalsection on the line 2-2 of one to swing the sledge; Frequently, the chains, Figure 1 bushings, and track shoes are badly damaged .Fig. 3 is ,asection" on the line 3-3 of Fig. '2;

tered from the driving asto render themworthm whi h 5, pi is inserted; V less. Often a shoe is so badly battered in r Fig. 5 is a fragmentary elevation of a modified moving the pins andsbushingsthat it becomes fonn of n y, impossible to'reinsertthese'parts afterthe repair n; 6 top viewof form shown in has been made. Furthermore, it is common f or p1 5; f v

workman 5 t during 3 Fig. 7 is a fragmentary top view of a modified because one the m u eho en ch form of vmachine adapted for pushing'bushings; while the other Strikes Y is lto Fig. 8 is an elevation of the mechanism shown hold the shoes securely in a convenientposition in Fig the bolster member being in section,

3;, for driving. In iaddition to these. objections, and Y considerable time is required- O the average a Fig; 9 is a topview ot a second type of bolster it takes two men in the neighborhood of eight for s with bushings. v J hours to repair cemplete track by t met The, form. or the invention illustratedin the heretofore m Pi our 's wh drawings contemplates a fluid driving unit and'a Plates devicewith i the "P i may. bolster supported upon the driving unit but m s 1 two hours or 1955 without spaced to serve as" anabutment for preventin danger of lmurytothe workmgfn damage to movement of the work piece when force is aph g gn f g zgg plied thereto; While the device is suitable in remove a m canbemdledsmyiwwmi535it?tfiififiifiii itiiiii t itiat in culty that theycanmt anon-many to which they 'haveia Dress fit, it is particularly machme the t, mi fi fi adapted for use in assembling and disassemblin AS result 0 ese ac f the tracks of so-called crawler typ tractors. a difilcult problem to develop sufilciently simple v b p 1 ted t device capable of developing the desired [pow r z gz t e gegr ig iz go 301 13221: as g 50 125.? ti c k. equlre vexcesive" f 91 that the floor may normally serveto support the A major object of our invention is the provi work piece but being formedto be capable of sion of improved mechanism for, removing and support directly upon the tractor for removal inserting the pins and bushings iromal track. of the first pin, it being necessary to remove this 5 pin before the track may be removed from the tractor.

Referring first to Figs. 1 to 4, inclusive, a body 11 is provided with sockets 12 and 13 for the reception of one end of side rods 14 and 15. The threaded pins 10 on opposite sides of the body 11 serve to secure the rods 14 and 15 within the sockets and permit their rapidconvenient removal, a bolster, designatedgenerally by' 16, being supported upon the opposite ends of the rods. The body 11, shown in section in Fig. 2, is provided with a cylinder 17 between the sock ets 12 and 13, a piston 18 being positioned therein for projection outward between the rods 14 and 15 and in a direction parallel therewith;

A packing leather 19 is secured to'the inner end" of the piston 18 and a packing 21 on the inner side of the cylindersurr'ounds the piston and is held in position by a retaining ring 22. The body is also provided with a well 23 in which is 'posi tioned injectors 24 and 25, which pass through the walls of the body and project from the upper side thereof. The injectors are arranged, through deferences in stroke and bore, to inject difierent amounts of liquid from the reservoir into the cylinder 17 upon reciprocation of the plungers 26. and 27. Reciprocation of the plungers 26 and 27 is brought about through forked levers 28 and 29 which are pivotally connected at one end to the body through links 31 and 32 and at an intermediate point to the plungers. Handles 33 and 34 receivethe oppositeends of the levers for manual rotation thereof to cause reciprocation of 'the plungers. The injectors 24 and 25 are so'constructed that the fluid in the cylinder 17 may be released for return .to the well 23 by abnormal depression of the plungers.'

Handles 35 pivotally supported on the body serve to facilitate the movement of the device.

. The bolster 16 consists of a cross-arm 36 having sockets 37 and 38 for the reception of the ends of the rods 14 and 15, the rods beingreleasably held therein by means of threadedpins 39, thepins having wings 41 to facilitate the rotation .of the pins. Intermediate the'so'ckets 37 and 38 is an opening 42 which serves to receivev and guide a plunger rod 43 presently to be more fully described. The opening 42 joins a ,slot 44 which is provided on its forward end with a marginal slot 45. The slot 45 serves as an abutment against which is received a boss 46 surroundingan opening 47 of a track, designated generally by the numeral 48, the opening 47 serving to receive a track pin-49 with a press fit. The bolster is also provided with an abutment 51 adapted to rest upon the opposite side of the track 48 and connected to the cross-arm 36 by means of a yoke 52 which may advantageously be integral with the cross arm and the abutment. The abutment is provided with a tapering bore 53 and a 'counterbore 54, the two bores providing an opening through which the pin 49 may pass as'it is expressed from the opening 47 of the track. The inner faceof the abutment is provided with a U-shaped slot 55 similar to the slot 45 and best shown-in Fig. 3. The open end of theslot is at the lower side of the bolster, the slots 45v and 55 permitting thebolster to he slipped down over the track, the boss 46 moving into-the slot 45, and the boss 56 on the opposite side of the track moving into the slot 55. These-slots serve to position the openings 54 and 42 with respectto the track, centering the pin 49 so that it will coincide with these openings. wwings 57 and 58 .holes 63 are openings through which the cleats of the track are normally secured thereto so that-in securing the bolster to the track, it is necessary to remove two adjacent cleats.

'Screws 64 are threaded into the lower side of the wings 57 and 58 and bear against the upper side of the track, thereby cooperating with the slots 45 and '55 in centering the pin 49 and the openings in the bolster. The screws 64 will be screwed into the wings more or less depending upon the size of the particular track being operated upon.

In order to transmit the movement of the piston 18 to the end of the pin 49, a cross-bar 65 having openings 66 and 67 near opposite ends thereof is positioned upon the rods 14 and 15, the rods passing through the openings 66 and 67, respectively. The openings are suificiently large .-to permit the bar to move longitudinally along the rods. The bar 65 thus presses against the end of the piston 18, as shown in Fig. 2. The bar is provided with an opening 68 substantially on the center line of the piston for the reception of the reduced end 69 of the plunger rod 43, the peripheral shoulder 71 bearing against the face of the cross-bar. The opposite end of the plunger rod 43 is reduced in diameter, as shownat 72, so as to be capable of entering the opening 47 in the track and isarranged to bear against the end of the pin 49. Thus, upon projection of the piston 18, the plunger rod 43 is urged against the end of the pin 49 causing it to be expressed from the opening 47 into the opening in the abutment 51. .During this operation, the abutment prevents movement of the track 48 by contact of the boss 56 with the abutment in the slot 55. The portion 72 of the plunger rod need not extend the full length of the plunger since it is only necessary to move-the pin 49 a short distance to ,release it from the track. Thus, the press fit between the pin and the track occurs only in the area 73 in which the pin is of greater diameter than throughout the remainder of its length, the portion 73 of the pin having a press fit in the outer ear 74 of one of the track shoes. Coiled springs 75 and 76 surround the rods 14 and 15 andbear at one end against pins 77 and 78 in therods. The opposite ends of the springs bear against the cross-bar 65, the springs causing the piston 18 to be moved back into the cylinder 17 when fluid pressure is removed by operation of the injectors" r In Figs. 1; and 2, we haye shown the device as used for the purpose of removing the first pin from the track when the track is in position uponthe tractor. In accomplishing thisoperation, the device is clasped by the handle 35 and by a handle 79 on'the yoke 52, and the bolster is lowered over the track from which two adjacent cleats. have been removed. tflhe bolts 62 are then inserted thus securing the bolster-firmly to the track. The screws 64 will, ,o f; course, have been set .toaccommodate the particular size of track. The plunger rod 43 is then inserted in ,the opening 42 and the end 69 thereof is inserted in theopening 68 of the cross-bar 65., At this .the piston 18 will beirapidly projected until the forward endof the plunger rod 43 comes incontact with the end of the pin 49. It the pin is not held too firmly, continued reciprocation of the.

plunger 27 will cause the same to be expressed from the opening 47. However, if greater power is required to loosen the pin, the plunger 26 may be reciprocated, whereupon the piston 18 will be projected with less speed but with greater power thereby providingthe extra power necessary for loosening the pin. When the pin 49 has been removed sufficiently to remove the portion 73 thereof from the boss 56, operation of the injectors is'no longernecessary since the remainder of the pin: jay be withdrawn with the fingers. At this point, the fiuid is-released from the cylinder 1'? and thepiston 18 is retracted by operation of the springs '75 and76. The expressing operation is then complete and the bolster may be removed from the track. Forthe removal of the remainder of the pins, the track-is removed from the tractor and spread out upon the floor with the cleats downward, as shown in Fig. 8. In this position, the press may be laid fiat upon the floor with the bolster resting over the track; the cleats supporting the remainder. of the track .at such elevation that the press operate horizontally. This position of the track is shown in Fig. 8, The press.

may then be rapidly moved from pin to pin without in any way moving the track during the expressing operations. 3 Since the removal of the,

pins separates the trackinto a plurality of relatively small shoes, it will be seen that the use of the mechanism describedsubstantially eliminates the necessity for handling a heavy track while it is being disassembled.

As previously stated, the press may be used with equal facility for the purpose of inserting the pins 49 and reassembling the track. Such .operation of the device is shown in Fig. 4. I In this case the press islowered over the track with.

the plunger rod 43 in a position to bear against the portion '73 of the pin to cause the pin to be moved into the opening 47, the bolts -62 being then inserted in theopenings 63 on the opposite side of the track.

, When very wide tracks are to be operated upon, we have found it convenient to employ the modifications shown in Figs. 5 and 6. In this instance, the rods 14 and 15 are replaced by similar rods 81 and 82 ,of suflicient length to extend to the side of the track opposite the pushing unit. A bolster having-a cross-arm83 is positioned atthe end of the rods which are received in sockets 84 and85 thereof Midway between the sockets 84 and 85 is an abutment 86 in the form of a boss projecting toward the track. An opening 87 extends through the cross-arm 83 and the abutment 86 to permit the pin to pass outwardwhen expressed. The abutment 86 is provided with a, U-shaped slot 88 similar to the slots 45 and 55, the open end of the slot, however, being at the upper side of the abutment so that the track may be inserted from the top. A plunger rod 89 is employed substantially similar to the plunger rod 43 except that it is of sufficiently shorter length to accommodate the track of greater width. The operation of this modification is substantiallythe same as that already described.

In Figs. 7 and 8 we have shown a device similar in its general principles of operation to that shown in Figs. 1 to 4, inclusive, but adapted for the purpose ofremoving the bushings from the track instead of the pins. In this device, the work piece consists only of independent shoes of the track rather than the track as a whole,,and, consequently, the wings 5'7 and 58 of the bolster are unnecessary. The bolster, therefore, consists of a cross-arm 91 and an abutment 92 connected by means of. a yoke 93 having a handle 94 thereon." The cross-arm 91 is provided with sockets 95 for thereception of the rods 14 and 15 and with an opening 96 between the sockets 95,the openingimmerging on the plain inner face of the arm.' The lower surface of, the cross-arm is provided with a plurality of serrations or grooves 97 intowhich the upper edge of the cleat 98 of the shoe 99 fits, these grooves permitting the work piece to move up sufiiciently far into the bolster for setting. The abutment 92 is provided with an opening 101 coaxial with the opening 96 of the cross-arm, this openirTg permitting the bushing 102 of the shoe to pass through the abutment. The lower side of the abutment is tapered, as shown at 103, to permit the abutment to come in contact with the side wall, of the shoe between the top plate 104 thereof and the bushing. A plunger rod 105, similar to the plunger rod 43 except for the outer end thereof, is positioned with its inner end in the opening 68 of the bar 65, as previously described. The

free end of the plunger rod 105- isprovided with a portion 106 of smaller diameter than the reoperation, the portion 106 of the plunger rod moves into the center opening 47 of the bushing and the shoulder 107 comes into cont act with the end of the bushing so that when the piston 18 is projected outward, the plunger rod will force the bushing out of the shoe by contact of theshoulder 107 against the end of the bushing. A pilot pin 108is adapted to be positioned in the opening 101 of the abutment and is provided with an end portion 109of a diameter to be receivable within the bushing, the pin being-relieved at 110 for freedom of movement. The pilot pin serves to guide the bushing from the shoe into the abutment opening 101 to 19136 vent damage to the bushing in removing or iriserting the same. The relief portion 110 is of such a diameter as to be receivable in the bushing opening 111 so as to guide the end of the bushing past the intersection of metal in the shoewhen the bushing is being inserted. Thus, the deyice shown in Figs. '7 and 8 is essentially the same as that shown in Figs. 1 to 4, inclusive, with the exception that the parts are so shaped as to accomplish the removal and insertion of the bushing rather than the pin.

In Fig. 9, we have shown a modified form of the bushing expressing mechanism. In this form, a cross-arm 112 is positioned on the ends of side rods 81 and 82 and is provided with sockets 113 for the reception of these rods, the rods being secured by means of threaded pins 114, as previously described. An abutment 115 having an opening 116, similar to the opening 101' of Fig. 8, is formed on the cross-arm 112, the abutment being adapted to bear against the side of the shoe in the same manner as shown in Fig. 8. This modification is adapted to function in the same manner as the device in the above-mentioned figure but is designed for use in expressing the bushings from the shoes of wider tracks, the only functional difference being that the rods 81 and 82 are longer to accommodate the wider shoes and a plunger rod 117 identical in shape with the plunger rod 105 is provided, the plunger rod 117 being of shorter length.

It will be seen thatwe have provided portable mechanism for expressing the pins and bushingsfrom the tracks of crawler type tractors which may be readily moved about from place to place. The press is constructed for use ina'horizontal position so arranged that the floor serves as the supporting means for the track. As a result of this construction, it is unnecessary to move thgl trapk to accomplish the removal of the variouspinsfthe device being susceptible oi movement along; the track to'the position of the pins. The press resting upon the floor, permits the operator to stand directly over the mechanism for the convenientoperation of the injector handles so that it. is operated with a maximum of convenience.- The device is capable'of use not only for assembling and disassembling the track after it is removed'from the tractor but is capable of use directly upon the tractor for the purpose of moving'the first pin and accomplishing the removal of the track from -;3the tractor. The press is so arranged that'interchangeable bolsters and plunger rods may be employed to accommodate the. device for use. upon a wide variety of work. pieces, in this instance accomplishing the removal of not only the pins but" of the bushings from tracks of any widths. The further feature of the device is that the piston and plunger rod are automatically returned to their retracted position by the release of the pressure in the cylinder, thereby increasing the speed of operation of the device? The press may be used with equal facility-{for both assembling and disassembling the track. As

a result of the operation of the device, the pins, bushings and. shoes oi the track =are notxin any way damaged, being smoothlyexpressed and impressed without being in any way battered or depreciated through the operation; Furthermore, the device permits the accomplishment of [this without any danger of injury to the operator andiat a much greatenrate ofispeed than has heretofore been possible. It permits the workto .be accomplished by a single workman in substantially one-fourth of the time previously required for two men, thereby substantially reducing the cost of repair operationseon this type of machinery.

While we have thus described and illustrated a specific embodiment of our invention we are aware that numerous alterations and changes may be made without materially departing from the spirit of the invention'o'r the scope of the appended claims, in which we claim:

1. A press of they character described comprising a body provided with a hydraulic piston adapted to be projected in a pressing stroke, a plunger shaped to be positioned wan an end against a frictionally held.element of a work piece and positioned to be moved by said piston to move said element, and a bolster supported on and spaced from said body to prevent move-. ment of.the work piece when force is applied to said frictionally held element said bolster comprising a cross-arm spaced horns and supported at spaced points on theboiiy anopening intermediate said spaced points to guide :the plunger, an abutment spaced from the cross-arm for the reception of the work-piece therebetween, and means fixedly connecting the cross-arm and the abutment.

2. A press of the character described, comprising a pressing unit, a plunger, means on said pressing unit for moving the plunger in a pressing stroke against the end of a frictionally held a track having frictionally held elements and 20 bosses surrounding the same, said bolster being arranged to provide abutments at opposite sides thereof, said abutments "having sockets for the reception of said bosses and openings for the passage of said pushing member and said frictionally held elements, and meansv for moving said plunger in a pressing stroke to insert or remove said irictionally held elements.

4. A press 0! the character described comprising a pressing unit having a cylinder, a piston, means for injecting fluid to said cylinder to move said piston in a pressing stroke, spaced side arms on said unit, a bolster supported upon said side arms to act as an abutment for a work-piece, a cross-bar slidably supported on said side arms in a position to be moved by said piston during the pressing stroke, and a plunger .s lnported on said cross-bar in a position to engage a frictionally held element of said workpiece, said plunger being movable with said cross-bar to move the frictionally'held element in an operative position on the floor and having a movable piston, a handle arranged to project said piston upon reciprocation and shaped to be reciprocated by an operator standing over the unit, a pair of arms shaped to interchangeably support .any of a plurality of bolsters in spaced relation to said piston, a bolster for holding a work-piece, a plungeracting between thepiston and the work-piece for transmitting a'pressing pressure to the latter, means carried by said arms for supporting any of a plurality of plungers of diil'erent shape characteristics in operative relationship with said piston and accomplishing different pressing operations, and means carried by said arms for returning the piston. from its projected position.

'6. In a portable press of the character described, bu'shing pressingmechanism comprising'an abutment adapted to abut against a work-e piece having a bushing opening, said abutment having an opening larger than said bushing opening, pilot means shaped to be passed through the opening in the abutment and into the opening of the work-piece; and bushing to pilot the bushing during the movement thereof,.

work-piece, and an opening for the passage of a member expressed from the work-piece; and said cross-arm having an opening for the reoeption of an expressing plunger, and means for supporting the bolster.

8. A portable press shaped to rest upon the floor for removing pins and bushings from tractor tracks when resting on the floor tree of the tractor comprising a hydraulic pressing unit having a movable piston, a handle on the top of said unit arranged to project said piston upon reciprocation and shaped to be reciprocated by an operator standing over the unit, a bolster for holding the track in a desired position, means for connecting the bolster to the unit, means acting between the piston and the workpiece for transmitting a pressing force from the former to the latter, and means on the press for supporting the same on the track while the latter is positioned on a tractor for removing a pin from the track, to remove the track from the tractor.

JOHN HERBERT ABRAMSON. EDWIN C. SWANSON.

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