US1527025A - Pivot for scale levers - Google Patents

Description

Feb. 17, 1925. y 1,527,025

A v H.F. BRUGIMANN PIVOT FOR SCALE LEVERS Filed Sept. 5, 1921 IS'Sheets-Sheet 3 Patented Feb. 17, 1925.

.uni-Tan ESTATES AILENT OFFICE.

ganso nlnueivrnivn, oreoirnnlvn, VER-MONT, Assrsnon To .HoWEseALn COMPANY, onnUTLAivn, vnnMoNT, Aconronnfrron 0F VERMONT.

`PIVOT FOB SCALE LEVERS.

V'Application filed September ra citizen of `theUnited States, residing in- `Rutland, county of Rutland, and State of liermona have invented certain new `and useful Improvements fin Pivots Vfor Scale Levers, of which the following is a specification.

ln the construction of Ascale levers, particularly'such as are employed in the manutactui'eot railroadtrack scales and scalesifor other heavy work, `considerable ditculty is encountered in accurately Ilocating the pivots which must abe inexact location upon the scale lever and parallel with and at proper Vdistances ztrom other pivots carried bythe scalelever. The working edge oi a pivot mustzbe ina horizontal position and exactly parallel and on a common level with. every other pivot 4in the same member.

The lobject ,of the prese-nt invention is to' provide improved scale lever pivots which can be adj ustably mounted in machined holes in the scale levers so :that the pivots will :be interchangeable and standardized, and more readily and accurately applied and removable for repair or renewal.

The master locations of the scale lever, pivots are obtainedby boring holes in the scale. levers at properly spaced points determined by means of the micrometer screw adjustments on the tables of the boring machine. A tpivot holder is channeled to receive a hardened, iinished pivot bar and then accurately/.turned into cylindrical form to iitthe bored holes ot the scale lever. `In shaping the cylindrical surface of the pivot holder, the unfinished holder block ismounted to turn upon 4an axis parallel ivith the working edgey ot the `finished pivot, which is conveniently accomplished by` mounting it upon the finished pivot or upon a master pivot or mandrel ot the same shape as `the linish-ed pivot and then turning the assembled pivot and holder upon centers in the pivot anis parallelwith the working -edge.`

The pivot holder is made ex ansible and wedging means are provided r etween the holder 'and ypivot -bar so that, when the holderand pivot. are mounted and properly adjusted in themachinedhole of the'` scale lever, the holder can be expanded into bind- 3, 1921. 4Serial No. 498,320.

ing engagement withfthe scale lever by the action ofthe wedging means. The .Wedgingmeans comprise preferably cooperating races uponthe pivot bar and holder, which .are tapered or inclined to the working edge or longitudinal 'axis vot' the pivot proper, ywhereby the holder is expanded by forcing ythe pivot longitudinally into it.

In order that my invention may be fully understood, I will irst describe the same "-withireference to the accompanying-drawi'njgs and Vafterward point out the novel vfeatures in the annexed claims. In said drawings z- Figure l is an inside elevation-lof one. part ot a sectional pivot holder.

.Figure '2 is an end View of the same.

Figure 3 is a. side elevation of thefiinished pivot bar.

.Figure l is-an end view of the same.

:Figure'i is a sectional, plan View of a portion of a scale lever having the improved removable pivot mounted therein.

1F igurei' is a side elevation of the same showing the pivot in end elevation.

Figure 7 is a vertical, transverse section `out 'the same'taken on the line/1&7 of Fig# ure. y

Figure 8 is a view ot the combinedpivot and holder showing in .section the holder in theiform of Figure 9.

Figures 9, 10, and 1l are, respectively, end views of different forms of the improved pivot and holder.

Figures l2 and 13 are detail perspective views of parts of diiferent forms of scale leve-rs, illustrating themounting of the improved pivot in a double-web affording support at opposite ends and exposing the pivot between its ends.

Figure lll is a side elevation ot the form of pivot and holder shown in Figures l2 andlS.

i Figure l5 is an end view of the same.

Figure 16 is a side elevation of a slightly dil'lerent shape of pivot and holder for use., `with the double webbed scale lever. I

`.Figure 1T is an end view of the sai-ne..A

ln `VFigures 5, 5, and 7. l have shown a secs, tion or portion of a wel-likiiown type of straight lever for a railroad track scale.y The lever is indicated at l and his formed as usual with a .main body portion having roo,

be located.

strengthening ribs or flanges above and below as shown at 1a and 11J and provided at approximately the proper locations for the pivot bearings with integral castvhubs or bosses 2 extending upon opposite faces of the main web body ofthe scale level'.

In the proper boring machine, with the positions located as accurately as possible, suitable holes or sockets are bored transversely through the reinforced hubs or bosses of the levers where the pivots are to The cylindrical holes referred to are indicated in Figures 6, and T by numeral 5. `When these holes, as shown at 5, are drilled, the proper parts of the strengthening bosses 2 are cut away to expose the pivots where desired. In the form of lever shown in the figures referred to, these bosses 2 are cut away as shown at 3, because, in this form of scale lever, the working edge of the pivot is exposed on opposite sides of thel scale lever, and presented upwardly.

A, finished, hardened pivot bar 10, such as shown in Figures 3 and 4, is formed with a knife edge bearing 10u of the desired included angle. In machining` this pivot bar lO,the bar is supported upon centers in its longitudinal axis and the facesl()b are cut parallel with this longitudinal axis with the result Vthat the knife edge will also be parallel to the axis of the bar. The bottom of the bar 10 is then formed b v cutting the faces 10C upon a. taper or inclination to the axis ofthe bar. The result of this operation is the production of a pivot bar that is of smaller cross sectional area at one. end than at the other and with an even taper from the large end to the small end while. at the same time. the knife edge bearing is truly parallel to the longitudinal axis of the bar.

To adjustably and removably mount the improved pivot bar in the machined hole of the scale lever, I form an expansible pivot holder which may be variously constructed as hereinafter explained. but which is preferably made in sections channeled to receive the pivot bar and externally shaped to accurately fit the machined opening in the scale lever.

'The preferred form of the expansible pivot holder as illustrated in Figures 1, Q. 5. 6 and T of the drawings, comprises two complementary halves or sections 15. having faces 17 in the plane of separation of the sections and the faces 18 and 19, the former of which is in a plane parallel with the longitudinal axis of the holder while the latter is at an angle or upon a taper to said axis. The angular relation of the faces 13 and 19 is. of course, determined by the an gular relation of the faces 10b and 1,0c of the pivot bar above referred to.

Two holder sections. made in exact dup1ieates, are fitted over the pivot bar 10, or a master pivot or mandrel of the same shape, and clamped in position thereon and placed in a lathe upon the centers in the longitie din-al axis of the pivot bar parallel with the working bearing edge 10a. Supported in this manner, the exterior surface of thesectional holder block is turned down to a cylindrical form to accurately lit the cylindrical hole 5 machined in the scale lever as hereinbefore described.

When the sectional holder has been shaped to tit the hole in the scale lever, it has portions cut away, as indicated at 20 corresponding with the cut-away portions of the reinforcing bosses 2 of the scale lever so that, when the assembled pivot bar and holder are driven in place in the hole of the scale lever, the working knife edge of the pivot bar will be exposed where desired.

llien the improved `pivot is mounted in the prepared hole of a scale lever, its position is accurately adjusted by rotating the pivot and holder in the hole or socket ofthe lever. In making this adjustment, the holder can be slightly wedged into binding` position so that the holder and pivot bar' will not``- turn too readily. The shape of the projectineend of the pivot bar affords means for convenient engagement for the proper tool b v which the final adjustment can be made. lllhen the knife edge bearing of the pivot is inthe desired location with reference to the other pivots of the system of scale levers. the pivotbar is driven up tight in its holder to expand the holder into .firm binding ell-- gagenient with the socket of the scale lever.

It will be understood that, in asseu'iblinea pivot bar in its expansilileiholder the surfaces IO" of the pivot come in contact with the surfaces 18 of the sectional holder while the surfaces 10c of the pivot are in contact with the surfaces 19 of the holder. This insures the presentation of the knife edge bearing 10EL of the pivot in proper horizontal position. The tapered surfaces of the pivot and holder cause the holder to expand when the pivot is driven longitudinally in the channel of the holder and in expand ing the holder' into this fixed position. the accurate horizontal position of the knife edge bearing will, be n'laintained.

Figure 10 of the drawings, I have shown a slight modification in which the pivot holder 3() .is formed of a single piece of metal with a pivot-receiving channel having angular side walls 31 parallel with the longi tudinal axis of the pivot holder and `a side wall 32, which is tapered or inclined to said axis. The holder 30 is cut longitudinally at 33 to form expansible spring jaws of its two sides. channel of the holder 30, the knife edge bearing 35a of this bar being presented. in the vertical plane of the cut 33 and exposed at opposite ends by the cnt-away portions of 35 is a pivot bar shaped to tit the It has been found that when the improved pivot is driven up to a practical degree of tightness in the scale lever, the knife edge of the pivot is held in fixed relation to the lever, but that it is possible, by driving up the pivot a bit tighter, to slightly raise the knife edge in the pivot holder. It has been found by experiment with the preferred form of pivot as illustrated in Figures 5, 6, and 7 of the drawings that from the point of beginning to drive in the pivot in the holder to the point Where the pivot Was considered as driven home, the knife edge of the pivot was actually raised .009. This slight change in elevation of the knife edge between extremes in the driven-in condition of the pivot permits some latitude of practical importance in determining the final adjustment of the pivot in the scale lever. It will, of course, be understood that, in designing a scale lever, the position of the holes in the lever should be arranged With regard to the stated variations soV that the knife edges can be placed Within practical limits of Where they are Wanted.

I claim l. A machined-in pivot for scale levers comprising an expansible pivot holder adapted to be seated in a socket of a scale lever, and a pivot bar seated in said holder andformed with faces which are respectively parallel With and inclined to the longitudinal axis of the pivot bar, whereby the pivot bar forces the holder into binding engagement With the socket of the scale lever and maintains its Working edge in lixed relation to the scale lever.

2. A removable pivot for scale levers comprising an expansible socketed holder adapted to fit a hole in a scale lever, and a pivot bar fitting the socket of said holder, said holder and pivot bar being formed with corresponding engaging surfaces parallel with the longitudinal axis of the pivot bar and other engaging surfaces which are inclined to said axis.

3. The combination with an expansible pivot holder formed with a receiving socket, one face of which is parallel with the longitudinal axis of the holder While another face is tapered or inclined to said axis, of a knife edge pivot bar having a surface parallel With its longitudinal axis and another surface inclined to its said axis.

4. The combination with an expansible socket-ed pivot holder formed in complementary sections, a knife edge pivot bar fitting the socket of said sectional holder, corresponding engaging faces of the holder and pivot bar being inclined to the axis of the bar to cause the holder to expand when the bar is forced therein.

5. The combination with a scale lever having a substantially cylindrical machined pivot-receiving socket, of kan expansible socketed pivot holder shaped to fit and be adjusted in the socket of said scale lever, and a longitudinally tapered pivot bar seated in said holder.

6. The combination with .a scale lever having a machined pivot-receiving socket, of an expansible pivot holder adapted to` be seated in the socket of said scale lever, and a pivot bar seated in said holder and formed ivith faces which are respectively parallel with and inclined to the longitudinal axis of the pivot bar, whereby the holder is expanded into binding engagement with the socket of the scale lever and the Working edge of the pivot bar is maintained in the desired angular relation to said lever.

7. The combination With a scalelever having a machined pivot-receiving socket, of an adjustable expansible pivot holder formed ivith a longitudinally tapered socket, y

and a longitudinally tapered knife edge pivot bar fitting the socket of said holder.

8. The combination 4with a scale lever having a cylindrical pivot-receiving socket of an expansible pivot holder shaped to lit and be adjusted in said lever socket and formed with a longitudinally tapered socket, and a knife edge pivot bar tapered longitudinally to fit the socket of said holder.

9. The combination with a scale lever having a reinforced section formed with a machined pivot-receiving socket, of an expansible socketed holder adjustably mounted in the socket of said scale lever, and a longitudinally tapered pivotbar fitting the socket of said holder.

10. A removable pivot for scale levers comprising an expansible socketed holder adapted to fit a hole in a scale lever, and a knife-edge pivot bar fitting the socket of said holder, said holder and pivot bar being` formed with corresponding engaging surfaces inclined to the longitudinal axis of the pivot bar and the holder being cut away to expose the Working knife edge Where desired.

ll. The combination with a reinforced scale lever forniedviith a pivot-receiving socket in its reinforced part and having said reinforced part cut away suiiiciently to expose the Working pivot, of an cxpansible socketed holder mounted in the socket of said scale lever and out away to expose the Working pivot, and a pivot barivedged in the socket of said holder.

1Q. The combination with a scale lever` formed with a pivot-receiving socket, an expansible socketed pivot-holder rotatably adjustable in said lever-socket, a pivot bar mounted in the socket of said holder and projecting beyond the holder at one end, said holder and pivot bar having engaging surfaces which permit relative longitudinal movement and lock circumferentially, whereby the pivot and holder can be rotated lflU together in the lever socket to adjust the pivot bar by engaging the projecting` end of said bar.

13. The combination with a scale lever formed with a pivot-receiving socket, an er;- pansible socketed pivot-holder rotatably adjustable in said lever-socket, and a pivot bar wedged longitudinally in the socket of said holder, the engaging surfaces of said holder and pivot bar permitting a limited relative movement longitudinally and locking circumferentially.

14. In a device of the character described, the combination of a member having a socket, a pivot holder rotatably adjustable in said socket, and a pivot bar wedged longitudinally in said holder, and wedging means securing both the holder and pivot bar in position.

l5. ln a device of the character described, the combination of a member having a socket, an expansible pivot holder rotatably adjustable in said socket, a pivot bar longitudinally wedged in said holder, and lock ing the holder and bar in position.

16. In a device of the character described, the combination of a shaped pivot bar having longitudinal wedge surfaces, with a pivot holder having a longitudinally tapered channel to receive said pivot bar, and formed with an outer cylindrical surface parallel with the working bearing of said pivot bar.

17. In a device of the character described, the combination of a member having a socket, a longitudinally tapered pivot bar having a working bearing, with a holder rotatably adjustable in said socket, said holder being channeled to receive said tapered pivot bar, and formed with an outer cylindrical surface parallel with the working bearing of said pivot bar.

18. In a device of the character described, the combination of a knife edge pivot bar having its knife edge parallel to its longitudinal axis and its cross-sectional area smaller at one end than at the other, with a holder block formed with a receiving` channel to accurately fit said pivot bar, and an outer cylindrical surface parallel with the knife edge of said pivot bar.

19. In a device of the character described, the combination of a tapered pivot bar formed with a knife edge parallel with its longitudinal axis, with a sectional pivot holder, each section of which is formed with an angular channel in its inner face, one wall of each of said channels being parallel with the axis ot' the holder section while the other wall of each channel is longitudinally inclined to said axis, said sectional pivot holder being` formed with an external cylindrical surface, which is parallel to the knife edge of said pivot bar.

HUGO F. BRUGMANN.

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