US1419457A - Crosshead - Google Patents

Description

M. n. JOYNER.

' cRossHEAn. I APPLICATION FILED JUNE I. |921. l IAMAA Patented June 13, w22.

2 SHEETS-SHEET l.

ATTORN EY IVI. D. IOYNER.

CROSSHEAD. APPLICATION FILED JUNE I., 192i'.

Patented .I une I3, 1922.

2 SHEETS-SHEET 2.

ATTORNEY mlmmx WITN ESSES MILES D. .TGYNER, 0F SEARTANBURG, SOUTH CAROLINA.

CROSSHEAD.

Specification of Letters Patent.

lr"atentetil J une i3, 192%.

Application filed June 1, 1.921. Serial No. 474,086.

To ZZ cli/7mm t may concern Be it known that l, Minas l). dornier., a citizen of the l' nited States, residing` at ISpart^.-.nbur.0v in the county ot Spartanburg and State or outh Carolina, have invented new and usetul improvements in Cross'- heads, et wnich the 'following is a specilication.

T iis invention has reference to cross heads ol1 any torni to which it may be adapted and it re` ts more part' Yulaily to an adjustable parts'associated therewith, whereby to provide lor take up ot wear and to insure .smooth g and long li'le oi the machinery in which the cross head installed.

ln accordance with the invention, the cross head comprises a body or boxing composed ot side plates connected together at one end ot the cross head by the piston rod socket and at the other end ot the cross head by the pivot bolt et the corresponding pitman bearing.

The side plates, which may have parallel top and bottom edges, engage top and bottoni gibs and between the side plates and gibs are connected wedge strips. one wedge strip, which is of tai-torni, being interposed between the upper edges ol the side plates and the uppermost gibs. and the other wedge strip being composed ot the side plates and the lowermost gibs.

Between the upper pair ot gibs and also between the lower pair ot gibs is a taper key tor spreading the gibs ci each pair apart and provision is made Jfor connecting the taper key to the gJ-shaped wedge member associated with it. in order to draw the parts up tight.

The side plates near their top and bottom ed are traversed by bolts connecting them together. and these bolts where traversing` the side plates are tapered longitudinally, so that they may snugly lit the parts they ra verse.

The gibs where traversed by the bolts are oli web and flange formation, while the bodies oli the gibs are made heavy to provide ample hearing against the parallel slide bars along which the cross head travels.

rllhe invention also contemplates additional ineans for compensating for wear as will hereinafter appear, and provision is made Yfor taking up the wear both laterally and longitudinally oli the cross head so that the gibs may be adjusted from time to time and the cross head will run smoothly with out play, thus greatly prolonging the li'lie ot the cross head and particularly of the gibs and contributing to smooth, noiseless action.

T he invention will be best understood from a consideration ot the following detailed description taken in connection with the accompanying drawings 'forming part of this specilication, with the understanding, however, that the invention is not confined to any strict conformity with the showing in the drawings, but may be changed and modified so long as such changes and modilications mark no material departure Jrom the salient features ol the invention as expressed in the appended claims.

ln the drawings:

Fig. l is a side elevation embodying` the invention.

Fig. 2 is a longitudinal thereof.

Fig. 3 is a cross section in pitman pivot bolt.

Fig. i is a longitudinal section on the line li-4l ot Fig. 2.

Fig. 5 is a perspective view of one of the gibs.

Fig. 6 is a perspective view of a taper key.

Fig. 7 is a perspective view of a double wedge used in conjunction with the side plates and gibs.

Fig. 8 is an elevation ol a key through which the side plate bolts extend.

Fig. 9 is an elevation ot a modified form of structure used to adapt old cross heads to eccentric bolts without employing the twin wedge.

Fig. l() is a section on the line 10-10 of Fig. 9.

Fig. ll is a 'tace view ol one oit the per- Aforated washers employed in the structure of Figs. 9 and l0.

Fig. i2 is a 'fragmentary section similar to Fig. 3 but showing' a modilication thereof.

Fig. i3 is a section through an eccentric bushing tor adjusting the gib.

Referring to the drawings, there shown in Figs. l and 2 a cross head A, to ne end of which there is secared a piston rod B by means of a socket 1 and the rod is made tast to the socket l by a wedge 2. The socket l is or may be in one piece with side plates 3 between which the socket 2 is cast. Traversing the side plates 3, near their other ends,

olf a cross head vertical section the plane of the ing the plates 3 at is a pivot bolt 4, passing through a brass 5 in the corresponding end of a pitrnan G, which may be assumed as extending to the part to be driven through the cross head.

rllhe body of the cross head is formed in part by the two side plates 3, which may be made flat andY sufficiently heavy for the pur` pose. The pivot bolt 4 is formed with a taper head Z having a seat 8 in the orresponding side plate 3 and taper shank 9 in the same side plate. The body of the bolt extends from the taper seat 9 to the other side plate where it is provided with a taper shank 10 passing through a taper seat 11 in the second side plate and beyond the second side plate the bolt 4 has a threaded continuation 12 to which is applied a nut 13 held in place by a cotter pin 14 or other suitable means.

F ast to the plates 3 and extending between the plates at the upper and lower edges thereof, are pairs of gibs 15, each composed of a block-litre body member 1G overhangthe ends and along one edge having a longitudinal taper seat 17 from the inner side of which a flange 18 projects opposite to the body 1G. Perpendicular kto the flange 18 on the side thereof remote from the seat 17 is a series of ars 19 of progressively different lengths, the ears of one gib being opposite to the ears of the companion gib, so as to leave a space bet veen tween them with the spaces in line diagonal to the length of the cross head, as best shown in Fig. 4. rlhe flange 18 between the ears 19 has perforations 20, traversed by bolts 21, which bolts also traverse the edge portion of the side plates One end of each bolt 2l is formed into a head 22, adjacent to which the bolt has a taper shank 28. rllhe end of each bolt 21 remote from the taper portion 23 and where it passes through the opposite side plate and perforation in the opposite gib is tapered, as indicated. at 24 and beyond the portion 24 has a screw-threaded continuation 25 'terminating in a squared end 2G. Applied to the tl'ireaded portion 25 are loelc nuts 27. The mid portion of the bolt 21 is eccentric to the longitudinal axis of the bolt, so that when the bolt .is turned, there is a respective movement between the parts traversed by the bolt due to the eccentricity of the mid portion of the bolt, so that the various portions are adjusted by the turning of the bolt with respect to the parts engaged thereby.

Introduced between the taper seats 1.7 of the opposite gibs 1G and the like edges of the side plates z are matching legs of tl-shaped wedges 29, the legs being joined at the thicker ends by a yoke 80 having a perforation 31 midway between the two legs. rllhere is also provided a key 82, shown sep arately in F ig. 6 and` in plan` view in Fig.

4, and appearing in cross section in Fig. 3, this key conforming more or less to the longitudinal shape of the gib ani. having along one edge a widened portion 33 in which is produced a longitudinal slot 34. At one end .of the widened portion 83, there is formed an eye 35 perpendicular to one face of the key. The key is introduced between opposite gibs and engaged by the ears 19 between which it is lodged and the perfor-ations 2O are arranged on opposite sidesof the slot 34, so that the bolts 21 when traversing the perforations 2() also traverse the slot 34.

Encircling one of the bolts, say that bolt nearest to the yole of the double .fredge 29, is the eye of an eye bolt 3i', the shank of which eye bolt passes through the ear and through the perforation 31 of the yoke 30 and has then applied to it loclr nuts 38. On the side of the ear 35 remote from the yoke 30, the eye bolt 37 has another nut 39 applied thereto, so that the double wedge 29 may be drawn up tight and forced between the ears 19 of the gibs and locked in the adjusted position. it the saine time, the lrey 32, which is in the form of a plate having a slight longitudinal. taper toward the ear 85, bears upon the adjacent ends of the ears 19, thereby tending to force the gibs apart until separation of the gibs is prevented by the engagement of the side plates with the heads 23 of the bolts 21 and with the nuts 2T at the opposite ends of the bolts 21. Further adjustment is provided for by the employment of shims 4() between the inner faces of the top and bottom portions of the side plates and the outer faces of the flanges 18.

The gibs of each pair have matching rabbets 41 to receive top and bottom parallel guide bars 42 permitting the cross head 'to reciprocate under the impulses of the piston rod B and thereby impart motion to vthe pitman 6 in the usual manner.

lWhen the cross head is assembled, all looseness is talren up by adjusting the bolts 21 to spread the gibs so that they embrace the guide bars 42 and are moved one away from the' other causing a neat lit between the bars 42 and the rabbets At the same time, the double wedges 255 take up any looseness between the side plates 3 and the inconjunction with the shims 49. Moreover, the taper form of the wrist pin 4, where passing through the side plates 3, provides for taking up any looseness which might otherwise occur or be due to wear between the pitman 6 and the cross head.

After the cross head has been in use for a while, wear occurs and then it is necessary to readjust the several parts, which adjustment is facilitated by the adjustments for which provision is made and such adjustments can be performed with great facility.

In order to adapt the invention to a cross head in which eccentric bolts are used in the absence ot the twin or double Wedge, the structure shovvn in Figs. 9 to ll may be employed. ln such case, eccentric bolts 2l, one of which is shown in l0 may be used. Each bolt 21a between the taper portion 24 and the threaded extension 25 is provided ,iith a squared portion to re ceive .a Washer lil bearing against the outer tace of the respective side plate and the washer del has a central passage ot square contour or of any other non-circular contour correspondingto the non-circular portion of the bolt. Tflach Washer il is provided with a circular series ot perforations e@ to receive a pin i7 extending through a per toration i6 in the Washer and made tast in the neighboring side plate S. ln this Way7 the bolt 2l may be held in the adjusted position to which it is moved in order to talle up Wear between the gibs and the guide bars 42, With the loclr nuts 27 serving to relieve the pins 4:6 trom excessive strains and also the pin 47 ivill prevent loosening` oi" the bolt 2l due to slipping with respect to the loclc nuts.

The shiins l0., as shown separately in Fig. S, are made with slots 4S to Vfacilitate their application to the bolts 2l or 21"'.

Instead ot taking up side lateral play with shims7 as indicated in Fig. il, the arrangenient shown in Fig. 'l2 may be employed and is the preterable Jform. The gibs 1G in the showing of Fig. l2 have each a beveled undercul tace lo and the side plates 3 are similarly undercut and beve-led, shown at il, so that when the key 32 and the bolts 2l are aiiljusted, both the up and down and the side play are taken up simultaneously.

lnstead oi" using bolts 2l with eccentric mid-portions, the arrangement shown in F lf3 may be employed. The mid portion il is made square in cross-section and in line with the longitudinal axis ol" the bolt7 and on the square portion there is applied a cylindrical bushing 22 with a square passage therethrough eccentric to the longitudinal axis thereo'l so that the bushing is eccentric and turns vwith the bolt. The arrangeinent ot Fig. .l-l pi'ovides a ca li-bolt structure 'which may be used in some 'forms ot cross-heads without the necessity ot re-drilling them larger.

lllhat is claimed is l. ln a cross head, a tvfo part gib with matching rabbets to receive a Gnide bar on which the gib travels7 said parts ot the gib having longitudinal llange on the edge remote trom the rabbet with the flange provided with ears projecting toward the other part of the gib and ot progressively different lengths troni one end ot the gib to the other with the ears dehning a channel running diagonally oi the gib, and a longitudinally tapered lrey lodged between the adjacent ends of the ears and shaped to spread the tivo parte ot the gib by longitudinal. movement of the key.

2. ln cross head, a tivo part gib "ith matching rabbets to receive a guide bar on s which the gib travels7 said parts oi the gib having a longitudinal lil je on the edge remote from the rabl'iet ivith the tiange provided with projecting toward the other part et the gib and of progressively different lengths troni one end of the gib to the other with the ears defining a channel running diagonally ot the gib, and a longitudinally tapered key lodged bet-.veen the adjacent ends ot the ears and shaped to spread the tivo parts ot the gib by longitudinal inovement ot the hey, the tivo parts ot the gib being provided with bolts connecting them together, tne llzej.' havi an ear formed thereon, and an eye-bolt connected to relatively li ed parts ciI the structure ancL traversing the eye bo ts ot the key to ,ause movement iI the latter lengthwise ot the cross head.

3. ln a cross headr/ an elongated gib structure having one edge provided with a rabbet to receive a guide bar along which the cross head travels and the opposite edge Ylormed with an longitudinal 'flange having laterally extended ears projecting therefrom with the ears ot progressively diii'erent lengths 'from one end of the gib toward the other, and the gibs being arranged in pairs with the ears matching and separated to form a channel. between them.

it. ln a cross head, an elongated gib structure comprising tivo parts, each having one edge provided with a rabbet to receive a guide bar along which the cross head travels and the opposite edge formed with an inset longitudinal llange having laterally extended ears projecting therefrom with the ears ol progressively ditlerent lengths from one end ot the gib toward the other, and the gibs being arranged in pairs with the ears matching` and separated to torni a channel between them.

Across head comprising opposed lace plates, longitudinally divided gibs each With longitudinal franges on one edge entering between the lace plates and the V[langes prol vided `with laterally eXtended ears ot progressively different lengths troni one end ot the gib toward theI other and separateiil at their adjacent ends to torni a longitudinally tapered channel, '.i hey adapted to the taper channel and correspondingly tapered in the direction ot its length, and bolts passed through the tace plates and the intervening flanges olf the gibs and also through the key with the latter having a longitudinal slot to accommodate the bolts, said bolts having eccentric bearings in the gib lianges to project or retract the gibs, and the key having means oi moving it longitudinally to vary the spread ot the divided gib.

lOO

lead c soclietconnecting the side plates at receive one end ol a piston rod, a piyot boit connecting the side plates .near the other end to receive one end oil" a pi man, two part gibs between the top and bottoni edges ol the side plates 'with the division between the two parts oit the gibs running diagonally o'l the cross head, a taper key, halgedbetw en and separating the two parts ot the gibs, and rota'taoie bolts extending through the side plat and the gibs with the bolts eccentrically inounted to torni earns or adjusting the gibs with relation to the cross heads.

7. il... cross head coni prising .'-aeliarated side plates, a socket connecting the 'de plates at one end to receive one end ol a piston rod, a pivot bolli connecting the side plates near the other end to receive one end ot a pitnian, two part gibs between the top and bottom edges oit the side plates with the division between the two parts oil the gibs ruiming diagonally ot the cross head, a taper key, lodged between and separating the two parts oit the gibs, and rotatable bolts extending through the side plates and the gibs with the bolts ecceutricz ily inounteil to torni cams :tor adjusting the gibs with relation to the cross heads, each bolt having a head at one end with a taper shank and at the other end also provided with. a taper shank with` the inte-ivinediate portion ot the bolt eccentric to the longitudinal axis thereof and having` the taper portion mounted in taper seats in the side plates and the eccentric portion extending through the gibs whereby to cause the projection and retraction oit the gibs n accorde ice with the direction oi turning oi the bolts.

i. L cross head comprising separated side plates. a socket connecting` the side plates at one end to receive one end ot a piston rod, a pivot bolt connecting the side plates near the other end to receive one end ot a pitnian, two part gibs between the top and bottoirl edges ot' the side plates with the division between the two parts ot the gibs running diagonally oit the cross head, a taper key, lodged between and separating the two parts ot' the gibs, and rotatable bolts extending through the side plates and the gibs with the bolts eccentrically mounted to Ytorni cains 'tor adjusting the gibs with relation to thel cross heads, each bolt having a head at one end with a taper shank and at the other end also provided with a taper shank with the intermediate portion ot the bolt eccentric to the longitudinal axis thereoi and having the ta per portion mounted in taper seats in the side plates and the eccentric portion extending through the gibs whereby to cause the projection and retraction oit the gibs in accordance with the direction ot turning o the bolts, each bolt having a threaded extension at the end reinote from the head, and a noncireular terminal at the saine end as the threaded extension.

9. ii cross head comprising side plates separated and connected togetl'ier,r two part gibs carried by the side plates and lodged between and extending trein the top and botedges ot the side plates, and double Y lvices between the top and bottoni d oit the side plates and the gibs whereby to expand the gibs iroin and perinit their retraction toward the central portion ot the cross head, and a taper key lodged between the two parts ol each gib and inovable lengthwise to cause the lateral spread or retraction ot each two part gib to adjust the width or" the gib to compensate tor wear.

l0. A cross head comprising connected side plates 'For joining a piston rod to a pit inan, two part gibs entering between like edges ot the side plates and projecting beyond said like edges and there provided with matching rabbets to receive the cross head guioe bars, said two part gibs having a division between thein running diagonally of the gib, double wedge between each two part gib and the corresponding edges of the .side plates, with the double wedge joined by a yoke, a taper key with a longitudinal. slot therein and having at one end an oiiiset ear Vwith the eer and yoke ot the double wedge having matching pei-iterations, eccentric bolts extending through the top and bottoni edges oit the side plates, the slots in the keys and the two part gibs with the bolts seated to adjust the gibs toward and troni the guide bars tor the cross head, and a connection between one ot the bolts and the ear on each ke),v and the yoke on each doublewedge, whereby to adjust the parts oit the cross head to eliminate all lost motion due to wear.

ill. ln a cross head. a two part gib with beveled undercuts, side plates similarly undercut and engaging the undercut portions ot the gibs, a taper key betweenl the two parts oit' the gib; and cani bolts traversing the side plates and gibs to cause the taking up ot wear both laterally and in ay direction perpendicular thereto.

ln testimony, that l claim the foregoing as my own, i have hereto allixed iny signature.

MllLES D. JOYNER.

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