US523142A - Platform-scale - Google Patents

Description

(No Model.)

H. L. FISHER. PLATFORM SCALE.

No. 523,142. Patented July 17, 1894.

.within this frame and having the transverse piece A of the platform A UNITED STATES PATENT OFFICE.

HARVEY L. FISHER, OF DES MOINES, IOWVA.

PLATFORM-SCALE.

SPECIFICATION forming part of Letters Patent No. 523,142, dated July 17, 1894.

Application filed May 25, 1893.

To rtZZ whom it may concern.-

Be it known that I, HARVEY L. FISHER, a citizen of the United States of America, residing at Des Moines, in the county of Polk and State of Iowa, have invented certain new and useful Improvements in Platform-Scales, of which the following is a specification.

The objects of my invention are to cheapen the cost, simplify the construction, and increase the strength, durability and efficiency of platform scales, to place all of the bearings beneath the frame of the scales rather than under the platform and to construct the weighing mechanism in a compact manner so that a comparatively shallow pit will contain all of the operative parts and retain the platform approximately at the ground sur-.

ace.

To this end my invention consists in the construction, arrangement and combination of certain operative parts of the weighing mechanism as hereinafter set forth, pointed outin my claims and illustrated in the accompanying drawings, in which-- Figure 1 is a bottom view of portions of the platform, and weighing mechanism. Fig. 2 is a side view of the same. Fig. 3- is an enlarged detail perspective view of the device to givhich the levers are pivoted at their inner en s.

Referring to the accompanying drawings the reference letter A is used to designate the supporting sills or frame scales preferably placed over a shallow pit.

A designates the platform loosely placed cross pieces A beneath its ends.

The scale leversB are mounted beneath the sills or frame A and extended in the same horizontal plane from the ends to the central portion thereof along each side, each one is supported by means of a link B which is passed over the knife edged bearings B and secured to the hook B which latter is fixed to the sill or frame A. A short distancein advance of the knife edged bearings B isa like bearing 0 from which depends a link 0 which supports a hook O that is secured to the cross Said levers B are disposed directly beneath the sills or frame A, in the same horizontal plane and in parallel vertical planes.

Serial No. 475,537. (No model.)

D designates a rock shaft extended transversely of the central portion of the platform. At each end of said rock shaft is a device D adapted to be permanently fixed thereto and having the lugs D projecting laterally therefrom. D is a knife edged pivot in said lug. D is a link encircling said pivot.

F designates a plate fixed to a, stationary support and containing a knife edged pivot 13 that supports said link D F is a lug projecting laterally from the opposite side of the device D and F is a knife edged pivot mounted therein to extend in opposite directions therefrom to connect and support the inner ends of the two lovers B as shown in Figs. 1 and 2.

The meeting ends of the levers B are supported at each side of the device by means of links .Twhich are passed over the knife edged pivot. This pivot F is located directlyin the transverse center of the weighing platform, beneath the side sills or frame and it will be obvious that any weight applied to the platform will cause the inner ends of the beams shaft D.

J designates an arm extended laterally and outwardly from the rock shaft D to be normally in a horizontal position and J is a rod attached thereto to connect with a suitable scale beam in an ordinary manner, so that when the rock shaft D is moved the rod J will be pulled downwardly.

It is obvious that by showing only sections of the frame and the platform in the drawings the operative parts can be shown on alarger scale than if the frame and platform were shown complete. It is also obvious that the rock shaft D extends across the center of the complete scales and thatits supports at each end are to belike those shown at one end only.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent of the United States therefor, is

1. In a platform scales, the combination of the following elements, to wit, suitable levers pivotally supported upon the end portions of a stationary frame and extended to a rock shaft at the center of said frame, a platform pivotally mounted upon said levers near their outer ends as set forth, a rock shaft extended B to move downwardly and thereby rock the transversely of the platform near its central portion and pivotally supported as set forth from a stationary frame, a lug extending laterally from the end of said shaft, knife edged pivots in the said lug and links connecting said pivots with the inner end of each lever substantially as and for the purposes stated.

2. In a platform scales, a frame A, a platform A within said frame, a cross piece A a lever 13 extending from the side portion of the frame and pivotally supported from the said frame by means of a hook B secured thereto and a link B and bearing B to connect the lever therewith and connected with the cross piece a by means of the bearing (J, a link 0 and a fixed hook c as set forth, a rock shaft D having a device D on its end, the lugs D projecting laterally therefrom, the knife edged pivots D in said lugs, links D encircling said pivots, the plate F fixed to a stationary support, a pivot F in said plate to engage the links D as set forth, the lug F" projecting from the device D the pivot 1 in said lug and the links J to support the inner ends of the levers B from the pivot F and the arm J extended from one end of the rock shaft D, all arranged and combined substantially as and for the purposes stated.

3. In a platform scales, a sill A, a rock shaft D and a device D connected with the endof said shaft and provided with integral lugs D" and F and pivots fixed in said lugs as shown, the levers B connected with the said lug F" by means of links and the pivots projecting from the lug, and the said rock shaft suspended from the sill A by means of the device D a link and the plate F havinga fixed pivot F all arranged and combined to operate in the manner set forth for the purposes stated.

HARVEY L. FISHER.

Witnesses:

II. J. SHUNK, THOMAS G. Onwto.

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