US1371745A - Adjustable crosshead - Google Patents

Description

A1. Fp-HSCHEm. ADJUSTABLE CROSSHEAD. APPLICATION FILED IULY 20, I920.

Patented Mar. 15,1921.

atteind@ nemen STATES- PATENT OFFICE.

JOSEPH F. EISCHEID, OF OELWEIN, IOW'A.V

.ADJUSTABLE Application led July 20, 1920. Serial No. 397,599.

To all whom t may concern.'

Be it known that I, JosnPH F. Eisernen), a citizen of the United States, residing at Oelwein, in the county of Fayette, State or Iowa, have invented certain new and usei'ul Improvements in Adjustable Crossheads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to machine elements, and more especially to guides; and the object of the same is to produce an improved crosshead whose wear faces or shoes may be adjusted on its pivot block-*from time to time to take up looseness.

The invention consists in making up each shoe of a pairof like coacting members mounted on inclined walls of the block and capable of beingl drawn toward each other to reduce the distance between their lianges and simultaneously moved outward on said walls as hereinafter explained.

The invention also consists in providing the ront-acting faces of the members of the shoe and the walls with stepped notches to hold the shoes positively after they have been adjusted.l Y

Details are set forth below and shown in the drawings wherein:

Figurerl is a complete perspective view.

Fig. 2 is a cross section on the line'2-2 of Fig. 1.

Fig. 3 is a plan view.

In the present case we may. assume that the crosshead is to be reciprocatedbetween parallel guides G byv movements of'an elementR such asa piston rod, and the reciprocations of the latterare in. turn to be communicated to another element C such as a connecting rod or pitinan which is pivoted at P within the crosshead. It is obviousthat, no matter how well the parts are built and fitted and kept lubricated, wear will occur in time. It is the purpose of the present invention to provide a crosshead which shall have wear faces or shoes traveling next the guides and taking thisv wear, the shoes being adjustably carried on a body A of appropriate type and` to which theelements R and C are connected.

Coming now to the details of the presentA shaped. as best seen in F ig. l. Here it is formed hollow, with bosses 2 in its opposite sides pierced with alined holes 3y for they passage of the pivot pin P, and fat one end it has an extension 4. and a coupling 5 within which the element R'may be secured inl any suitable manner. It is. essential that at top and bottom its walls 6 converge, preferably in planes standing about to the vertical, and these walls are provided on their outer faces. with longitudinall stepped notches 7, while their upper edges are connected byv a vflat top wall 8. Transversely through the block. are formed bolt holesl9, preferably about four in number and also preferably slightly oval with their longer axes upright, and it may be well to have the notches 7 in two banks or groups, one above and one below the series of holes as seen in Fig.` 2. v

VCoacting with said block are upper and lower shoes, which,v being duplicates I will describe but one. Each shoe is made up ot two like parts or members l() and 11, each cut away on its inner face to produce a' shoulder l2 so that when the members are turned face to face the shoulders contact asseen in Figy, and the ends of the members aro ysubstantially flush. Each member, as seen in Figs. l and 2, has a substantially triangular body with an upstanding liange 13 to travel against theside of thek guide, the top 14 of the body underlying the guide, and the inclined face 16 overlying the inclined wall 6 of theV block l and provided with stepped notches 17, preterably arranged in two groups or banks, the body also having transverse bolt holes between these groups as indicatedl at 19. .ils will be seen in Fig. l, the shoes are somewhat longer than the block,` and provided with abutments or lugs15Y which, when the two members of any shoe Vare Vappliedto. one edge of the block, vextend acrossVV the yends of the latter so as to absolutely prevent. *longitudinall movementy of the members on theblock and shearing of the bolts 1,8.

. In the assembly. ot' the parts of; a crosshead as thus constructed, the element or rod R is screwed into the coupling'v 5 of vtheblock-and the element or connecting rod C is pivoted at P thereto.,V With saidblock standing be tween the guides G and G, a pair of shoe members 1() and 11 are now applied to the upper converging walls with their shouldered inner faces lapping at 12, and bolts 18 are passed through the alined holes 9 and 1Q. Then another pair of shoe members are sinnlarly applied to the lower side ofthe vblock and bolted thereto. `Before setting up the nuts on the bolts, however, the parts or members of each shoe are moved up the stepped notches T so that their upper faces 11i closely underlie the guide Gr and the inner faces oi their flanges 13 closely Acontact with its sides;` and having adjusted one shoe to the upper guide, the other shoe is adjusted to the lower guide, ,care being taken that the center of the rod R is exactly midway between the guides and in true alinement with thc` axis ot' the cylinder from whose piston it leads. When aiter long use the faces or' the shoes sliding against the guides become worn, the nuts on the bolts 18 are loosened, the members of each guide advanced one or two steps out the walls 6 of the block as the elongation ot the holes 9 permits, and the nuts tightened up; and here again care must be taken to adjust the upper and lower shoes to take up wear where it is found but to guide the crosshead along a line strictly parallel withthe axial movement of the rod R. iVhile it is possible that the stepped notches might be omitted, or the walls 6 might converge on some other angle than that suggested, .l preierthe notches because they prevent slipping of the contacting faces, and i prefer 450 so that the notches may be of the shape shown and the members oi each shoe interchangeable with each other or with the members oi' the other shoe, thereby rendering it possible for all said members to be made by the same die or machine.

Vhat is claimed is:

1. In a crosshead, the combination with a( block whose walls at top and bottom converge and are provided. with stepped notches in two groups, the block havingtransverse holes between said groups; oft shoes at top and bottom, each made up oi?. coacting mem bers "whose inner `faces are inclined and provided with two groups of stepped notches and with holes between the groups, and bolts passing through alined holes.

2. ln a crosshead, the combination witha block whose walls at "top and bottom converge and are provided with notches in two groups, the" block having transverse oval holes between said groups and the longer axes of such holes beingupright;` of shoes at top and bottom, each made up of coacting members whose inner faces are inclined and provided with two groups of Vnotches and with holes between the groups, and bolts passing through alined holes.

Bl crosshead adapted for movement betweenlspaced parallel guides, the same com.-

prising a block whose walls converge at top and bottom and are provided with notches, Y

y, shoes at top and bottom or' the block, each made up oi? a pair of members having lapping shoulders on their contiguous faces, inclined notched faces coacting with said notched walls, and `flat wear iaces with `spaced flanges to tit a guide, and means toradjusting each pair of members on the body.

e. In a crosshead, the combination with a hollow block having bosses in its sides pierced with alined holes for the pivotal connection of one element and an extension4 to it the elements which it is to connect, the

walls of said block converging at top and bottom and being pierced with transverse holes, shoes at top and bottom of said block, each made up of two coacting members having their inner walls converging to mate with the walls oi said block and their-wear faces shaped to adapt themto the guide along which they travel, said members being pierced with transverse holes, and bolts through such members and the interposed block and holding the former in adjusted position on the latter. Y

6. In a crosshead, the combination with a block having means for attaching it tothe elements which it is to connect, its walls converging at top and bottom and being pierced with transverse holes; .of shoes at top and bottom of said block, each made up of two coacting members `having their inner walls converging to mate with the walls of the block and their wear faces shaped to adapt them to the guide along which they are to travel, lugs at the ends of said inclined -faces adapted to pass the ends of the block, and means' for clamping the members laterally Vagainst the converging walls of the block in adjusted positions.

7. In a crosshead, the combination with a block having means for attaching it to the elements which 'it isto connect, its walls converging at top and bottom and being pierced with transverse holes; of shoes at top and bottom of said block, each made up of two coacting members having their inner walls converging to mate with the walls oiV the block and their wear' faces shaped to adapt them tothe guide along which they are to travel, lugs at the ends of said inclined facesadapted to pass the ends of the block, said members having transverse holes.

through their inclined faces, and bolts through the holes in the members and in the interposed block for holding the former in adjusted position on the latter.

JOSEPH F. EISCHEID.

Witnesses:

JOHN P. MALLEY, KENNETH RUSHTON.

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