US336275A

US336275A - Letter-scale

Info

Publication number: US336275A
Authority: US
Publication date: 1886-02-16
Anticipated expiration: 1903-02-16

Description

(No Model.) 2 Sheets-Sheet 1.

T. B. WILLSON. LETTER SCALE.

No. 336,275. Patented Feb. 16, .1886

Fig 1.

Q CAMS EMMA I Mm (No Model.) 2 SheetsSh-eet 2. T. B. WILL-SON.

LETTER SCALE.

No. 336,275. Patented Feb. 16, 1886.

PATENT OFFICE.

THEODORE B. \VILLSON,

LETTER- OF CHICAGO, ILLINOIS.

SCALE.

SPECIFICATION forming part of Letters Patent No. 336,275, dated February 16,1886.

Application filed February 24, 1885.

To all whom it may concern:

Be it known that I, THEODORE B. \VILLsON,

a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Letter- Scales, which are fully described in the following specification.

Thepurpose of this invention is to provide an improved and more simple device for weighing letters, for the purpose of ascertaining the postage required thereon.

The particular characteristics aimed at are, cheapness and compactness of construction, freedom from liability to derangement, and accuracy and sensitiveness in weighing.

It consists in the scale-beam and its support made rigid, as integral, and preferably of one piece of sheet metal, bent so that one part formsthe supportadapted to rest upon any horizontal surface, and the remaining part extends horizontally off from the support, and is adapted to sustain a letter pan or tray suspended at points selected at will thereon, the parts which form the scale-beam and the support, respectively, being arranged so that the former extends horizontally off from the latter, the support having sui'licient breadth of bearing to sustain the entire device erect and stable when not loaded, and having an edge which forms the pivot of the device when rested upon a horizontal surface, and recessed between such pivotal edge and the overhung scalebeam, to allow the letter pan or tray to extend beyond the vertical plane of the pivotal edge toward the upright part of the support, so that its point of suspension may be brought nearer to the said vertical plane, and the size of the apparatus thereby diminished.

It consists, further, in details of construction hereinafter described, and set forth in the claims, whereby material is economized in the construction.

The letter pan or tray,whether above or below the scalebeam, should be in stable equilibrium, its center of gravity being below the point of contact with the beam. To secure this, when the receptacle is above the beain,it must be provided with suitable extension below the beam to more than counterbalance it and lower the center of gravity of the entire pan or tray. The center of gravity being suspended, the entire'pan or tray may be considered as suspended, and I shall so refer to it.

Serial No. 156,884. (No model.)

In the drawings, Figure l is a perspective of a form of my letter-scale having the rccep- L tacle below the beam. Fig. 2 is a similar view of a form having the receptacle above the beam and extended in a suitable counterbalance below, the structure of both scale and scale pan or tray being somewhat difi'erent from that shown in Fig. 1. Figs. 3 and I show plans of the blanks from which the scales illustrated in Figs. 1 and 2, respectively, are formed, illustrating how they are cut without waste from continuous sheet metal.

A is the blank from which the scale-beam and its support are formed. A is the scale beam; A", the support.

In the form illustrated in Fig. 1 thesupport A comprises the upright part a and the horizontal part or foot a, the entire support and scale being of the form of a letter, J, lying upon its shorter arm, the end a of which becomes the pivot when the scale is overbalanced. In this form the said shorter arm or foot a is preferably formed concave below, as shown in dotted line, to insure that the edge a, which is the pivot, shall not be prevented by grains or dust on the supportingsurface from being in contact with the surface and performing its function as such pivot. For a similar reason the end a is preferably out out between the corners a (L as illustrated, so that the two corners only are in actual contact with the supporting-surface,and the greatest accuracy and sensitiveness thereby secured. In this form the recess a between the scale-beam A and the foot-piece c permits the pan, when hung underneath the beam, to be moved farther toward the support and nearer the point of maximum weight than could otherwise be done. This form has the scale-beam narrowed, as illustrated, and is preferably planned so that the length of the wider part,which forms the rear of the beam, and the upright a and the foot-piece a is equal to that of the narrowed part, by means of which it becomes possible to out these pieces from a continuous strip of metal whose width is equal to the entire length of the piece without any waste, except a very small amount at the end only of the strip, as illustrated in Fig. 3.

In the form shown in Fig. 2 the portion a cut from the sides of the scale-beam A, are

bent down to form the supporting-legs, and

their ends a a are the pivots over which the entire scale rocks. The length of metal neces: sary for these legs a, not being equal to the entire length of the scale-beam A, I econo= mize material in making by forming the rear support, A with the recess or rift a as wide as the scale-beam A and as deep as the excess of length of the scale-beam A over the legs a, whereby I am able to out these pieces or blanks successively out of a continuous strip of sheet metal without waste, as illustrated in Fig. 4.

B is the letter pan or tray suspended,on the scale-beam A by passing the latter into the loop-hole or slot 1), which is made wide enough to allow the free oscillation of the pan or tray.

In the form shown in Fig. 1 the letter-receptacle B is below the loop-hole b, and so hangs below the scale'beam, and is always in stable equilibrium. It is preferably made approximately or perfectly balanced under its point of suspension, so that it may hang horizontal, thereby permitting the entire device to be made lower than if the receptacle were vertical. Being horizontal, one portion of it must extend from the point of suspension toward the upright support A and thus in weighing the greater weights for which the device is adapted, it enters the recess between the horizontal scale-bea1n A and the horizontal foot-piece a. I prefer to form this style of pan or tray, as clearly seen in Fig. 1, by striking up the portion B which has the loop-hole I), out of the bottom or recepltacle proper, B, thus economizing materia In the form shown in Fig. 2 the letter-receptacle B is above the loop-hole b, and so above the scale-beam A. This necessitates the downward extension or counter-balance B whereby the center of gravity-is sufficiently lowered, so thatwith the greatestweight which the apparatus is adapted to weigh in:

. pose of these devices to weigh accurately the letters or parcels put into their receptacles, but only to test them for postage. The scalebeam is therefore marked and notched at the points indicating and corresponding to the denominations or fraction of weight by which postage is computed, as at one half-ounce, one ounce, one and a half ounce, two ounces, &c.,

and in testing letters for postage the suspension-loop will be rested in successive notches until a notch is found at which the weight in the pan or tray will not overbalance the de- Vice. 7

I claim- 1. In a letter-scale, the scale-beam and its support, formed asintegral and adapted to be sustained upon a supporting-surface, the support having its bearings upon such supporting-surface in vertical planes inclosing the center of gravity of the entire beam and support, and having as part of such bearing an edge adapted to serve as the pivot over which the scale-beam and support may rock bodily when overbalanced, substantially as set forth.

2. In a letterscale, the scale-beam and its support, formed as integral, the said support having below the pivotal edge, over which the beam rocks, and recessed between said pivotal edge and said overhanging scale-beam, in combination with the letter pan or tray, suspended freely on the scale-beam and adjustable thereon at will, and adapted to enter said recess.

, 3. In a letter-scale, the scale-beam and its support, formed as integral and comprising the horizontalscale-beam, the horizontal foot,

and the upright, joining their ends and leaving a recess between them, in combination with the letter pan or tray suspended and adjustable on the scale-beam and extended toward and adapted to enter said recess.

ish its weight, and the said shorter arm havving the pivotal edge over which the device rocks when overbalanced.

5. In a letter-scale, the letter pan or tray adapted to be suspended below the scalebeam, and formed as integral from a single piece of sheet metal by-having its suspension loop and arm struck up out of the bottom, substantially as set forth.

6. In a letter-scale, the combination of the scale-beam A, foot-piece a, and upright a,

formed as integral and bounding the recess .a, and the letter-pan suspended below the scale-beamand substantially balanced under its point of suspension and extending horizontally toward said recess, substantially as set forth.

7. In a letter-scale, the scale-beam and its support formed of one piece and narrowed IIO at the portion which constitutes the scalebeam, substantially as set forth.

8. In a letter-scale, the scale-beam and its support formed of one piece of sheet metal and narrowed at the portion which constitutes the scale-beam, said narrowed portion and the remaining wider portion being of substantially equal length.

In testimony whereof I have hereunto set my hand, in the presence of two witnesses, at

Chicago, Illinois, this 1st day of February,

THEO. B. WILLSON.

Attest:

FRANK S. BLANOI-IARD, CHAS. S. BURTON.