US921920A - Platform-scale. - Google Patents

Description

A. A. VAN METER.

PLATFORM SGALB.

APPLICATION FILED APR. 2B. 1003.

921,920. Patented May 18, 1909.

2 SHEETS-SHEET 1.

flif/Mfm/f Patented May 18, 1909.

I BEBB'M-BHEET 2.

A. A. VAN METER.

PLATFORM SCALE.

nruonrox nun 2.2a, 190a.

UNITED STATES PATENT OFFICE.

ALBERT A. VAN METER, 01* l-IARRISONVI LLE, MISSOURI, ASSIGNOR OF ONE-HA Ll TO FRANK H.

HOWARD. OF HARRISONVILLE, MISSOURI.

PLATFORM-SCALE.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed April 28, 1908. Serial No. 429,623.

'1' '0 all Whom it may concern:

lie it known that l, ALBERTA. VAN Marian, a citizen of the United States, residing at Harrisonville, in the county of and State of Missouri, have invented a new and useful Platform-Scale of which the following is a specification.

This invention relates to platform scales and its object is to simplify the construe tion of devices of this character and to provide scales which do not require pits under them.

Another object is to reduce the number of parts of the scales without sacrificing their efiiciency or rendering them less durable.

With these and other objects in view the invention consists of certain novel features of construction and combination of parts which will be hereinafter more fully described and pointed out in the claims.

in the accompanying drawings is shown the preferred form of the invention.

In said drawings: Figure 1 is a plan view of the scales, the platform being partly broken away and the scale beams removed. Fig. 2 is a section on line AB, Fig. 1, and showin the scale beams and their connections with the platform in elevation. Fig. 3

a detail view of one of the platform supporting hangers.

Referring to the figures by characters of reference, 1 designates the main frame of the scales, the same being preferably formed of channel iron the flanges of which are inturncd. Brackets 2 extend inwardly from opposite ends of the frame adjacent the sides thereof and are notched as at 3, said notches constituting seats for knife edges t formed On collars 5 which are shrunk or otherwise secured upon rock bars 6 extending longitudinally within the frame. These bars may be tubular and cylindrical as shown in the drawings or, if preferred, can be solid and of any desired contour. Secured upon and extending inwardly from each end portion of each bar 6 are parallel arms 7 arranged in pairs, each collar 5 being positioned between the arms of one pair and all of the bars of the two pairs being normally located with their upper faces in the same plane. Each of the arms 7 has a notch 8 in its upper face and all of the notches of the arms on each bar are disposed in alinement. Each pair of arms has an angular inverted substantially U-shaped hanger 9 interposed be- .shown and described it will accurately twccn them and extending in opposite directions from each hanger are alining arms 10 provided with knife edges 11 designed to rest within the notches 8. Hangers 9 constitute seats for I-beams 12 which support the platform 13 of the scales.

The two bars 6 extend through a slot 14 in one side of the frame 1 and secured to thc projecting end of each bar is an obliquely extending arm 15, the two arms converging toward a line extending through the center of the frame and terminating in parallel extensions 10 which bear within a stirrup 17. This stirrup is suspended loosely from a rod 18 connected to a lever 19 which is mounted in a suitable supporting frame 20. Said lever has its fulcrum at one end while its other end is connected by means of a link 21 with a scale beam 22 of any preferred construction and having weights arranged thereon in the usual orany preferred manner. When a weight is placed upon the platform 13 the I-heams 12 will bear downwardly upon the hangers 19 and knife edges 11 will also hear on the arms 7 and cause the bars 6 to rock in one direction, their knife edges 4 constituting bearings whereby this movement is permitted without producing friction. The arms 15 will be swung downwardly by the bars 6 so as to force the stirrup 17 downwardly and pull through the rod 18 on lever 19 whereby the scale beam 22 is actu ated through link 21.

Importance is attached to the fact that the bearing points of the bars 6 are located directly under them and therefore the sensitiveness of the scale is greatly increased.

By constructing the scale in the manner Weigh any object placed thereon no matter where said object may be positioned on the platform. It will be seen that the scale is very simple, durable and efiicient and is particularly desirable inasmuch as it becomes unnecessary to form a pit under it as is the case with the ordinary large platform scales such as used for weighing wagon loads of material.

What is claimed is 1. The combination with a main frame consisting of channel irons having inwardly directed flanges, and a platform movably mounted between the upper flanges of said channel irons; of brackets within and supported by opposite portions of the frame,

rockbars above the brackets, bearing members upon the bars and having knife edges bearing upon the brackets, said knife edges being normally disposed in vertical plane with the axes of the bars, and means between and carried by the bars for supporting the platform.

2. In platform scales the combination with a main frame and brackets therein; of rockbars above the brackets, collars thereon and having knife edges bearing upon the brackets,'-said knife edges being normally pwitioned in vertical plane with the longitudinal axes of the bars, arms extending laterally from the bars and arranged in pairs, an angular hanger supported by each pair of arms and having knife edges bearin on said arms, beams supported at their en s Within the hangers, and a platform carried by the beams.

The combination with rock bars, arms extending therefrom, and a platform sup orted by the arms and between the bars; of converging arms secured to the rock bars and having parallel extensions, cooperating scale beams, and a stirrup suspended from one of said beams, the extensions of the converging arms resting loosely Within the stirrup In testimony that I claim the foregoing as my own, I have hereto affixed my signalnre in the n-esence of two Witnesses.

ALBERT A. VAN METER.

EVitnesses CHAS. L. ALLEE, GEORGE C. Eur.

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