US1154780A - Cross-head. - Google Patents

Description

STATES ATE GUSTAF L. KOLLBERG, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS -CI-IALMERS MANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

CROSS-HEAD.

a cross-head which is simple in construction and efficient in its operation.

One of the more specific objects is to provide simple and efficient devices for firmly clamping a cross-head pin intoa bifurcated integral body portion whereby a rigid assembled structure is produced.

Another object is to provide means for v permitting independent clamping of the pin to the several branches of the bifurcated body by means of circumferential wedge surfaces coaxial with the pin.

Still another ob ect is to provide means for clamping the pins in place, which are readily accessible and which permit rapid assembling and disassembling of the crosshead. a

In prior constructions of bifurcated crossheads it has been customary to provide the several branches of the body with alined tapered bores and to clamp a correspondingly tapered pin into these bores by means of a single nut or other clamping device applied to one end of the pin. It has also been proposed to clamp the pin in position by means of the usual devices applied at one end thereof and to provide an additional pin retaining meansin the form of a plate at theother end thereof which co acts with end portions of thepin, this plate being secured in place by means of a' series of bolts or cap screws threaded into the cross-head branch. The use of both of these structures has been found objectionable, es-

pecially when applied topum'ping engines having such a bifurcated cross-head, since the pin would become loose and would de- Sp ecification of Letters Patent.

Patented Sept. 28, 1915.

Application filedDecember 14, 1914. Serial N 0. 877,812.

stroy the rigidity and accuracy of the connection afiorded thereby. In such a clamping engine the forces on the piston rod are transmitted through the cross-head and the distance rods to the plunger. As the distance rods are connected directly to the branches of the cross-head and as these forces reciprocally reverse their direction for successive strokes, the stresses on the cross-head tend to bring together and to separate the branches thereof during successive strokes. These then are the conditions that tend toward loosening of the pin.

In order to overcome the objections of the prior devices, the present invention contemplates the use of a single nut adjacent to each of the tapered portions of the pin, for firmly, adjustably and independently clamping these portions into the adjacent branches of the crosshead.

A clear conception of an embodiment of the invention may be had by referring to the drawing accompanying and forming a part of this specification, in which like reference characters designate the same or similar parts in the various views.

Figure 1 is a transverse verticalsection through a bifurcated cross-head and the pin clamping means therefor, showing the crosshead applied to a fragment of the piston rod. Fig. 2 is an end view of a bifurcated cross-'head,'a section being taken through the piston rod connected therewith.

The bifurcated cross-head 1 comprises essentially a body having a pair ofbranches 2, 3, formed integral therewith. The branch 2 is provided with a pair of bosses 13 having parallel bores therein. The branch 3 is provided with bosses 14 having parallel borestherein, the bores of the bosses 13, 14:, being parallel to each other .for connection to four distance rods extending to and connected with the plunger head. The body of the cross-head 1 is provided with a screw-threaded opening within which the screw-threaded portion 19 of the piston rod 17 is fitted and is clamped by means of the piston rod nut 18. The branches 2, 3, of the cross-head 1 are provided with tapered, alined bores of difierent diameters extending transversely relative to the axis of the piston rod 17. The cross-head pin 4 1s provided'at its 1I1ld PltlOI1 W itl1 a cylifi drical bearingpo'rtion adja'cent to which are formed tapered, conical portions 6, which fitthe tapered Y bores of the branches 2, 8, respectivel The protruding" ends of the pin 4 are provided with cylindrical bearing portions 9, 10, which normally to:- act within the cross-head guidlng shoes,

not shown. The pin 4 at'its portionnear the tapered portion 5 thereof, .isprovided with a threaded portion 1 upon which is fitted-a clamping ring nut 11. QThe, nut 11 isformed with a suitable plane clamipng surface which coacts. with an adjacent plane surface of the cross-head branch-2.; The

ring nut ll is rotatable by means of a spanner wrench Which maybe fitted into the sockets 15 of the nut 11. In order, to prevent the pin 4 from turning within-its tapered bearings, the same is provided with a projecting dowel which fits-into an ad acent recess or slot 21 formed in the opening through the branch 2-.

- Adjacent to the tapered portion 6, the-pin 4 is provided with a shoulder 8. The sleeve nut 12 has an internal bore which coacts' with a cylindrical portion of the pin and also has an end surface-which eoa-cts directly with the shoulder 8-. The peripheral surface of the sleeve nut 12 is screw-threads ed, the screw-threaded portion normally oo- 'a'cti-ng with and being adjustable within the internally screw-threaded portion 22 of the branch 3. These screw threads formv wedge surfaces coaxial with the pin 4-. The sleeve nut 12 is adjustable within the screw-threaded portion 22 of the branch 1 by means of a spanner wrench which may be applied to the sockets. 16.

When it is desired to securethe pin .4

I 1 within the branches 2, 3, of the -cross-head 1,

it is first necessary to have the tapered conical portions 5, 6, snugly fit the adjacent tapered bor'es of the cross-head branches. The proper fit is usually obtained by grindthe tapered portions of the pin 4 into their bearings preliminarily to clamping. The independent clamping of the pin 4 to the cross-head at the tapers 5, 6, is then proceeded with by tightening nuts 11, 12. The tightening of the nut 12 places entirely under compression those portions of the nut lying between the screw threads and the taper 6, as contradistinguished from the g prior construction hereinbefore referred to where a pla'te is brought against the end of the pin by cap screw-s threaded into theadjaeen't branch of the cross-head.-' There comparatively weak screws are placed under tension and would be inadequate to resist 'the fer-Gee tendingto bring tegether and to separate the branches of the cross-head.

It will be noted that with the pin 4 thus provided with circumferential coaxial wedge devices foriindep'endently' clamping each of thetape'rs' 5, 6, into the adjacent-branches 2,

3',''o'f thecross-head 1, a very rigid structure is produced] and thep o'ssibility of having the pin 4 become'loosened', is "reduced to a minimum. The nuts 11, 12,-a'rereadi1'y iac- "tessibe for manipulation and may beadj'usted independently of each other at any "time, inca'se loosening of either end efthe pin occurs; By providing ring and sleeve Skilled in the art.

It is claimed and desired to secure 7 ters Patent 1 1. In combination, abifurcatedbody having a pair. of bran hes; m ans en eetins saidfbranches, means having screw threaded coaction with said connecting means for clamping together one of said branches; and said connectingmeans, and'meanfs for clamping together at engaging surfaces the other of'said branches and {said connecting means, said clamping means including circumferential wedge surfaces; coaxial with said conn'e-cting means and said wedge surfaces placing entirely under compression the portions of'saidv clamping means lying between said wedge surfaces and said engaging surfaces, a

2. In combination, a bifurcated body having' a pair ofbranches', .a pin connecting, said branches, a nut having screw-threaded c oa o tion with said pin for clamping one of said branches to said pin, and a second nut having screw threaded coactionwith the. other of said branches for clamping the same to 3. .In combination, a bifurcated body having'v a pair of-branches, a pin having a plu- 'r'ality "of tapered portions, a nut having screw-threaded 'coa'ction with said pin for "clamping one of said branches toat least one of said taperedportionsand a second nut having. serewethrea'ded "coaetion with the other of said branches for clamping the same to atl'e-a'st one of said tapered portions.

4. In combination, a bifurcated body hav- '-ing a pair:of branches-La piston-rod and reachiro'd's subjecting said body to alternate tension and compression stresses in the direction of the length of said branches, a pin inventor is afiixed hereto in the presence of connectcilng said branches, and circlumferen two Witnesses. tial We ge means coaxial with sai pin an located at each of said branches for sepa- GUSTAF KOLLBERG' 5 rately clamping together said pin and Witnesses:

branches. L. E. STROTI-IMAN,

In testimony whereof, the signature of the W. H. LIEBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G."

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