US156259A - Improvement in scales for weighing coins - Google Patents

Description

W. SGHMBLZ.

Scales for Weighing Gains.

No.i56,259. Patented 0ct.27,1874.

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UNITED STATES PATENT QFFICE.

WILLIAM SCHMOLZ, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENTYIN SCALES FOR WEIGHING COINS.

Specification forming part of Letters Patent No. 156,259, dated October 27, 1874; application tiled August 31, 1874.

' ments on balances which are intended for delicate weighing; and it consists mainly in the use of a novel adjusting arrangement or conical guides, by which I am enabled to place and keep the bearings of the stirrups in a constant and regular position upon the outside knife-edges of a beam. It further consists in the use of a small and line perpendicular adjustment for raising and lowering the stirrups to set and regulate accurately their lengths by means of two clamp-nuts, as will hereinafter more fully appear.

Referring to the drawings for a more com- I plete explanation of my invention, Figure 1 is aside elevation of my balance with a section of the base. Fig. 2 is an enlarged view of the guides L. Fig. 3 is a bottom view of the base, showing the self-acting lever.

A is the central post, having the arm or plate B across the top. Through the top of the post the block 0 moves up and down, being operated by an eccentric from below by means of the crank D. E is the scale-beam, resting upon an agate or steel plate in the center of the movable block 0 by the knifeedge F. The stirrups G are supported from each end of the scale-beam by small uprights, which are covered with agate or steel plates over the knife-edges.

In order to adjust the saddles H so that they will always have their bearings at an equal distance from the central bearing, they are made with a conical guide, L. Beneath and through this guide, close tothe shoulder M, a pin, N, passes transversely. An opening is made through the plate B, just beneath these cones, and when the scale-beam is lowered until the shoulder M rests upon the plate B these cones enter the opening, which they fit without any horizontal movement. A transverse slot receives the pin N as it descends, and this prevents thewlishes from being affected by a horizontal movement in practical use, as by the ordinary construction of scales. The rod which supports the stirrups is provided with a case or open box at its lower end, and a sleeve, P, projects a short distance below this box. The rod 0 which suspends the stirrups enters this sleeve, and is provided with double adjusting thumb-nuts Q, for the purpose of making the stirrups of the same length by lengthening or shortening the rod within the cylinder or sleeve P. Beneath the platform R of the scale is a bar, S, which has two arms, T T, at right angles with itself from its ends. These bars have arms U midway of their lengths, which serve as pivots, about which the arms T turn. Another arm, V, projects from the bar S, near its middle, and parallel wit-h the arms T, The free ends of the arms T are beneath the center of the scale pans or dishes, and a pin, W, extends upward from each arm, so as to touch the bottom of the scale-cup when the stirrups are of the same length. From the end of the arm V another pin passes up through the bottom of the platform, and terminates in a knob, X, at the front. The bar S serves as a counterpoise, and keeps the pins W and knob X raised up just strongly enough to cause the pins to follow the scale-cups when they are raised, and retreat with them when they are depressed. The indicator Y extends down within the column, and the back opening of the column is fitted with a ground glass, so that a light can pass through, but objects behind the column cannot be seen, and thus interfere with a delicate observation of the indicator.

The operation of adjusting the bearings is performed by letting the scale-beam down until the cups on the beam and the cones upon the saddle have fitted their corresponding openings. The scale-beam is then raised, and the pins W will follow them up. If the stirrups are not even in length, they can be adjusted by means of the thumb-nuts Q, and by these means the scales can at any time be accurately adjusted.

the arms T T and V as and for the purpose herein described.

4. The ground glass plate Y of column A, as and for the purpose specified.

In witness whereof I have hereunto set my hand and seal.

WM. SOHMULZ. IL. S.]

Witnesses:

O. W. M. SMITH, R. GIBBoNs.

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