US110696A - John h - Google Patents

Description

@niet JOHN H. TRUEX, OF ROO-BESTER, NEWYORK.

Letters Pate-.fa No. 110,696, einen January isn'.

IMPROVEMENT iN PLATFORM-SCALES.

The Schedule referred te in these Letters Patent and making of the same.

To all whom it may concern.:

Beit known that I, JOHN H. TRUEX, of the city of tochester, in the county of Monroe and State of New York, have invented a certain new and nseiul Improvement in Platform-Scales, of which the following is a specification.

Nature of the Invention.

This invention is similar in principle to the patent of Thaddeus Fairbanks, December' 2i), 1859, but cmbodies an improved construction and arrangement ci' the parts, whereby the levers and their stir-rups have a free and independent action.

General Descrip tion In the drawing- Figure l is a perspective view of my improvement.

Figure 2,a vertical cross-section of' the saine, shov'. ing the free and independent action oi the levers and their stirrups.

Figure 3, a view of Fairbanks scale.

A A represent the levers;

B B, the stirrups; and

O represents the loop by which the parts are suspended.

The leversare of the kind ordinarily used, and at their outer o1' divergngl ends are attached to the opposite corners ofthe platform.

At their inner or converging ends they have bearing-points c a, which rest respectively in bearings l; i in the bottom bars of the stirrups.

The stirrups are simply rectangul-ar i'raiues, resting` one within the other, and being entirely free., and having no connection one with the other, except the passage of the sides of the loop C, through the holes (l d ofthe outer one. y

v These holes are made somewhat larger than the sides of the loop, so as to allow a free actinof the inner1 in the outer stirrup.

The top bar of the inner stirrup also has a bearingpoint, f, upon which rests and is suspended the outer stirrup.

The advantage of this construction is as follows:

` Each lever and its stirrup has a free action, so that it can swing outward or inward independently ot" the other, as shown by the outline in fig. 2. In other words, yas the outer stirrup is simply hung upon the bearing-point f, and as its lever, resting upon its lower bar, is entirely free 'ofany attachment to or connection with the other stirrup and lever, said parts can be thrown out oi' in without, in any manner, affecting the other parts.

This action is very necessary, since it is frequently the case that heavy weights are dropped heavily upon one side or the other oi' the platform, which give-s a sudden impetus and causes binding and rigidity unless son/ie provision is made tc relieve it. In this arrangenient, the independent action of each set of levers and sth-rups, obviates all dicnlty of the kind.

In Fairbanks scale this effect cannot bc accomplished, since the upper bar ci' the'outer stirrup, and the lower bar of the inner stirrnp, both bear and bind upon the double points it it of the upper lever, which are thus confined between them.

It will-be seen that if either this or the lower lever receives an end motion, it must impart the saine motion to both stirrups, instead of one, and consequently to the other lever. Therefore, both sets of levers and stirrnps are practically bound together, which renders them stili and rigid in action, and not so eil Vective in use.

In addition to the above, there is an essential difference in the'construction of the two devices, since in mine two rectangular frames of complet-e forni are used, one situated within the other, whilc in Fairbanks but one frame is used, with a attached to the loop inside to form the inner one.

I am aware that stir-rups have been suspended one within the other, but they are only set one upon the other on the pivots, and are not connected together, which renders the scales liable tobe thrown down by any liar or sudden movement.

In my invention the liability to suoli accidents is avoided by the stirrups being loosely held together by the continuation of the loop O, which passes through thefupper plate of the outside stirrnp, and through the sides ot' the inner stirrup, andis secured by a suitable nut.

C latin.

What I claim, and desire to secure by Letters Pa*- ent, is

The arrangement oi' the two stirrups B B', one inside 'of the other, the outer suspended on the inner, both being loosely attached to each other by the continuation of rthe loop G, which p'revents their being detached by accident, with the levers A A resting upon their respective stirrups independently of any connection with the other, whereby a free action of'each set is obtained with a secure construction of mechanism, as herein shown and described. y

J. H. TRUEX.

Witnesses:

R. F. Oscoop, G. WILLM. MIATT.

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