US372055A - Platform-scale - Google Patents

Description

(No Model.)

s. J. AUSTIN.

PLATFORM SGALE.

Patente-d 055. 25, 1887.

qven 011/ UNITED STATES STEPHEN J. AUSTIN, or

PATENT OFFICE..

TERRE HAUTE, INDIANA.

PLATFORM-SCALE.

SPECIFICATION forming part of Letters Patent No. 372,055, dated @croiser 25, 1887.

Application filed December 20, v12386. Serial No. 222,092. (No modi-l.)

To all whom it may concern.-

Be it known that I, STEPHEN J. AUSTIN, of Terre Haute, in the county of Vigo and State of Indiana, have invented a certain new and useful Improvement in Platform-Scales, of which the following is a-lull, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which- Figure 1 is a side view of a platform-scale with parts broken away, exhibiting the improvement. Fig. 2 is a transverse section at 2 2, Fig. 1, looking in the direction ofthe arrows, the right-hand bracket and supportingbolt being omitted. Fig. 3 is a top View of one of the levers. Fig. 4 is an end view of the lower bearing. Fig. 5 is a vertical section at 5 5, Fignlf. Fig. 6 is an enlarged detail vertical section through one of the'square steel coupling-staples ofthe levers. Fig. 7 is a detail perspective view of the coupling device of the ends of the levers. Fig. Sis a perspective view ofthe beam rod leverI with its connections.

, This is an improvement on my patents of May 1S, 1875, No. 163,440, and February 26, 1878, No. 200,683.

A are foundation plates or blocks, which are upon afirm foundation at the bottom of the pit B. The topa/.ofthe foundation-blocks forms a bearing for the gravitating rollers C, the said bearing being curved in a direction transverse to the axis ofthe roller, as seen in Fig. 4, and straight in a direction parallel with saidaxis, as shown in Fig. 5. The roller will of course tend to rest in the lower (or central) part ofthe bearing and to return to this part when carried away by the movement of the platform.

D is a bearing-block having a bearing-surface, d, similar to the bearingsurface c, which rests upon the roller C. The roller G has end lianges, c, which, by bearing against the edges of the blocks A and D, prevent the endwise displacement ot' the rollers.

At the top of the bearing-blocks D is a post, d', having a shallow rounded trough, forming a bearing for Athe k nifeedge E,which is secured in a pair of arms, F, extending from the twist or torsion pipe G, extending transversely from one bearing to another. (See Fig. 2.)

H are lever-arms firmly attached at the inner portion to the twist-pipes, and coupled together in pairs at the other ends by means of l staples Iand open links K. The staples I are l secured to nose-pieces J, which are in turn bolted to the ends of the levers. The open links are made ofround steel and siniplyhooked into the staples. The staples are made of bars of square steel, which are bent into a curve 1n such manner that the plane of the curve passes through two opposite angles. these angles forms the outer and the other the inner circumference ofthe curve, and the latter forms the knife-edge upon which the open link bears. There are four of these twistpipes shown, each supported upon two foundationdevices, theknifeedges E forming the fulerums of the levers.

It will be seen that a single longitudinal series of levers is all that is needed to make connection between the different twist-pipes and the lever L, which is connected to the scalebeam by rod L2. (See Fig. S.)

M are knife-edges near to and parallel with the knife-edges E, and also secured to the same pair of arms, F. The bearing-edges of the knifeedges Flare of course turned downward, while the bearingedges of those M are turned upward, and each knife-edge M rests at the foot a of a bearingblock, N, the foot having a groove to receive the edge of knife-edge M. The foot a has sufficient length to give it an extended bearing upon the knife'edge M. The length ofthe head of the hearing-block N is at right angles to that ofthe foot, and at its ends are horns a', upon which are h ung the links O, to which are hung the l1a1igei.biackets l?, upon which the platform-timbers It rest. S is the platform. The timbers and platform are secured by bolts T or any other suitable means. The brackets l? are thus placed on opposite sides ofthe bearing-block N, and the two platformtimbers also placed eqnidistant from the block N on the other side, so that there is equal bearing on each side of the block.

The outer twistpipes have each a single lever-arm, l-I, extending inward, while the two inner twistpipes have each two of the arms H II, forming a lever, H H, rocking ou its fulcrums E and coupled at its ends with the outer lever H and with the lever L. The levers H H have truss-rods H', whose upper ends rest in recesses made in the top of the post G, extending upward from the middle of the lever blocks by means of the described intermediates Thus one of 6o IOO H H. The lower ends of the truss-rods pass through lugs H in the lever-arms H, (see Figs. l and 3,) and have nuts which may be screwed up on the rods to slightly raise the ends ofthe lever. The lever L is fulerumed on a standard, L. One of its ends is connected L0 the scale-beam rod L, and the other end has hooks Z, which engage in the staples l at the inner ends of the levers H H. lt will be seen that a weight upon the platform will depress the ends of the lever-arms Hof the outer and end bearings, and also depress thc outer ends ol' the lever H H to which those lever-arms are coupled, and the saine thing will elevate the inner ends of the levers H Hand the inner end of the lever L, to which they are coupled, thus depressing the end of lever L which is connected to the rod L2.

It will be seen that the length of the two lever-arms H which are connected to the beanr rod lever L may be varied at pleasure without varying the length ofthe other levers H, the scale-rod lever and scale being constructed to give the proper result upon the scale.

I claim as my inventionl. The coupling consisting o'a pair of plates or nose-pieces, J, a pair ofsquared staples, l, forming knifeeflge bearings, and a link, K, substantially as described.

2. rlhe combination ofthe outer twist-pipes having outwardly extending bearing arms, single levers secured at the inner side ofthe Outer twist-pipes, inner twist-pipes having inwardlyextending bearing-arms, double levers secured to the inner twist-pipes and coupled to the single levers, and the beam-rod lever coupled to the inner ends ofthe doublelevers, substantially as described.

STEPHEN J. AUSTIN.

Ti tn ess es:

ROBERT SNIDER, S. T. REEsE.

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