US557687A - Eccentric-strap - Google Patents

Description

(No Model.)

F. MERTSH-EIMER.

EGGENTRIO STRAP.

No. 557,687. Patented Apr. 7, 1896.

l'aueniri WW 5 m .3 a 2 AN DREW aoRAMM. PHOTO-umawAsmN GTDNJ] C llNiTED STATES FREDERICK MERTSHEIMER,

ATENT OFFICE.

OF KANSAS CITY, MISSOURI.

ECCENTRlC-STRAP.

SPECIFICATION formingpart of Letters Patent No. 557,687, dated April '7, 1896.

Application filed July 26, 1 8 9 5.

T 0 all whom, it may concern.-

Be it known that I, FREDERICK MERTs- HEIMER, of Kansas City, county of Jackson, and State of Missouri, have invented a new and useful Improvement in Eccentric-Straps, of which the following is a specification.

My invention has relation to the construction of eccentric-straps for steam-engines and other machinery, and to the manner of lining the same with Babbitt or othersoft metal for reducing friction, and of securing the same therein. It consists in the peculiar construction hereinafter described and claimed; and the objects are to increase the durability of the strap, to prevent undue wear of parts, and to provide for the convenient refitting and relining of worn straps.

Eccentrics and eccentric-straps are usually made of cast-iron, and the two iron surfaces working together soon become worn, the ec centric wearing down and becoming reduced in diameter and the interior of the strap wearing out and becoming enlarged, the result of which is lost motion and ineflicient work; also, the parts wear out of true, wearing faster at some points than at others. It becomes necessary, therefore, to turn down the eccentric and to close the strap and rebore the same from time to time. This, however, has its limits, as any material reduction i n the size of the eccentric shortens its stroke and renders it inadequate to perform the work required, so that ultimatelyit becomes necessary to replace the worn parts with new ones of adequate size. These difficulties are largely overcome by my improved construction.

In the accompanying drawings, which illustrate my invention and form a part of this specification, Figure 1 represents a side view of an eccentric with my improved strap applied thereto. Fig. 2 is an interior face view or development of one-half of the strap, and Fig. 3 is a sectional view illustrating a slight modification.

Referring to the drawings, A A designate the two complemental parts of an eccentricstrap bolted together, as usual, one of said parts being either formed on or adapted to be separably connected with the eccentric-rod, as heretofore.

The strap as a whole, being cast, bored out, or otherwise formed to fitt-he eccentric in con- Serial No. 557,190. (No model.)

nect-ion with which it is to be used, is formed interiorly with a groove or channel 1 slightly wider at the bottom than at the top, and in the bottom of this groove I form two narrow grooves or channels 2 2, also slightly wider at the bottom. than at the top, leaving between the two a dovetail rib 3, all as clearly indicated in Fig. 2. The central rib 3 is divided at intervals by notches or dividing-spaces 4, which preferably extend obliquely across and are alternately inclined in opposite directions, as indicated at the left hand of Fig. 2. These notches or dividing-spaces are also wider at the bottom than at the top, as indicatedby broken lines in Fig. 1. The strap thus formed is to be filled or lined with fine Babbitt metal 5, which is securely held in place by reason of the form of the grooves or channels 1 2, and it is further secured and prevented from turning in the strap by reason of the notches 4: formed in the central rib The strap thus constructed is conveniently filled or lined by placing it on a suitable mandrel, the eccentric itself being preferably used for this purpose, the strap thus forming a mold into which the molten metal is east through a mouth or opening 0 formed for this purpose.

Unless the Babbittmetal lining be confined within the'strap it will, by reason of its softness and ductility, flow out laterally under the pressure applied by the operation of heavy machinery. This is guarded against and prevented by the side walls '7 7 of the groove or channel 1, which, as already indicated and as shown in Fig. l, closely fit the perimeter of the eccentric and effectually prevent any lateral flow, thus rendering distortion under pressure impossible, and consequently improving the durability of the strap.

lVhen, finally, the parts become worn to an extentto produce lost motion or to impair the efficiency of the device, the eccentric and strap are trued up as usual, the Babbitt lining being first melted out and afterward recast.

\Vhile I have described the invention with reference to its application to eccentricst-raps, it is manifest that it is applicable also to connecting-rods and other couplings, and I do not wish, therefore, to be understood as limiting myself in the matter of its application or use.

In the modification illustrated in Fig. 3 I show the rib 3 formed with openings 4: therethrough instead of the notches 4 shown in Figs. 1 and 2.

interiorly with a circumferential groove or channel, increasing in width toward the bottom, two circumferential grooves or channels formed in said first-named groove also increasing in width toward the bottom, forming between the two a dovetail rib, said rib having transverse openings at intervals.

In testimony whereof I hereunto set my hand this 2d day of July, 1895, in the presence of two attesting witnesses.

FREDERICK MERTSHEIMER.

,Vitnesses E. B. Coons, C. R. HUGHES.

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