US25473A - Scales - Google Patents

Description

A. TURNBULL.

Spring Scales.

No. 25,473. Patented Sept. 13, 1859.

. nmsvzor: @QQ 622@ Mn/W UNITED STATES PATENT OFFICE.

ANDREIV TURNBULL, OF TEST )IERIDENy OONNECTICUT, ASSIGNOR TO HIMSELF, AND JAMES D. FRARY, OF MERIDEN, CONNECTICUT.

SCALES.

Specification forming part of Letters Patent No. 25,473, dated September 13, 1859; Ressued June 2, 1874, No. 5,901.

To @ZZ whom t may concern:

Be it known that I, ANDREW TURNBULL, of Test Meriden, in the county of New Iaven and State of Connecticut, have invented a new and Improved `Weighing Device, the same being a combination of what are generally known as the spring balance and the counter scales; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specication, in which- Figure l, is a side view of my invention, a portion of the casing being removed in order to exhibit the internal mechanism. Fig. 2, a horizontal section of ditto, taken in the line a2, ic, Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

The object of this invention is to obtain a weighing device by which articles may be weighed accurately and with facility the adjustment of poise weights dispensed with, and at the same time, one that will admit of being used on a counter as the ordinary counter scales.

rIhe invention consists in combining a spring balance with the beam lever and scoop platform, substantially as hereinafter described whereby the desired end is :1ttained.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents ahollow conical base through the upper end or apex of which an arbor B, passes, the lower end of said arbor being connected to the interior of the base by a link a. On the upper end of the arbor B, a scoop platform or frame C, is placed to receive a scoop D, of the usual or any proper form and near the upper end of the arbor there is a cross bar E, which is provided at each end with an eye Z). These eyes b, Z), are fitted on knife-edged bearings c, c, at the outer end of a beam lever F, the outer end of said lever being divaricated, as shown clearly in Fig. 2, so as to extend around the arbor B, to opposite sides at points adjoining the eyes b.

The fulcrum of the beam lever F, is formed by having two knife-edged projections c, c, one at each side of the inner part of the divaricated portion of the beam lever. These knife-edged projections are fitted in bearings at the upper end of uprights G, G, attached to the base A. The base and uprights may be of cast metal and cast in one piece. The scoop platform or frame C, may also be of cast metal and also the beam lever F. The arbor B, is allowed to rise and fall freely in the base A, the link a, serving as a guide as usual.

To the lower parts of the uprights G, G, plates H, H, are attached one to each. These plates project out from the uprighis G, and each has an upright shell I, at its outer end. These shells are connected together by screws or bolts and form a box or case into which the inner end of the beam lever F, passes and is allowed to work freely up and down therein. Within the case formed by the shells I, I, an arbor d, is placed transversely and has a pinion e, fitted on it. Into this pinion a segment rack J, gears said rack being attached to the inner ends of the beam lever by a pivot f, on which the rack is suspended loosely the rack being kept in gear with the pinion by a spring g, attached to the upper edge of the beam lever and bearing on the back part of the upper edge of the segment rack. The rack J, of course forms a portion of a circle of which t-he fulcrum of the beam lever is the center.

To the inner end of the beam lever F, the upper end of a spiral spring K, is attached. The lower end of this spring is attached to a screw L, which passes through a transverse bar z, in the lower part of the case formed by the shells I, I, the lower end of the screw having a nut z', on it as shown clearly in Fig. l.

To the outer side of each shell I, a graduated circular plate M, is attached and on each end of the arbor CZ, an index N, is secured, said arbor passing through the centers of the plates M. The indexes II, point out on the plate M, the degree of tension to which the spring K, is subjected when the outer end of the beam lever F, is depressed by the article to be weighed, and consequently the weigl'it of the article in the scoop is indicated by the indexes. It will of course be seen that the indexes are actuated by the rack J, and pinion e. One plate M, is necessarily graduated in a reverse manner or. order to the other so that they may conform to the direction of the movement of the indexes.

On the arbor B, there is a projecting hub or bass j, which serves as a stop preventing any unnecessary depression of the arbor and undue tension of spring K. v

By the employment or use of two indexes and graduated plates M, M, one at each side, the device will not require to be turned around in any case as the weight will be indicated at both sides. By having the lower end of the spring K, attached by the screw L, and nut z', to the traverse bar 7L, the spring K, in case of becoming weak may be strained by screwing up the nut z', and kept at a uniform tension. By having the rack J, attached to the beam lever F, by a pivot and kept in gear with the pinion @,by a spring g, compensation is made for wear and any irregularity or inaccuracy in the rack or pinion, and the device will operate much more correctly than if the rack were rigidly attached to the beam lever.

The arbor B, with scoop platform C, attached and guide link a, together' with the beam lever F, are old and well known devices and I do not claim said parts, but,

I do claim as new and desire to secure by Let-ters Patentl. The combining of the beam lever F, with scoop platform C, attached, with the spring K, rack J, adjustable or fixed pinion e, with index or indexes N, attached to its arbor 6l, and traversing over a graduated plate or plates M, substantially as and for the purpose set forth.

2. I claim attaching 0r suspending loosely the rack J, to the beam lever F, by means of a pivot f, and having a spring g, acting on said rack in order to keep the same in gear with the pinion c, for the purpose set fo-rt-h.

3. I claim attaching the lower end of the spring K, to the traverse bar 7L, by means of the screw L, and nut z', in order to regulate the tension of the spring and preserve its uniformity substantially as and for the purpose set forth.

4. I claim in combination with the beam lever F, spring K, and indexes N, connected with the beam lever the stop on the arbor B, for the purposes specied.

ANDREIV TURNBULL.

litnesses JOHN C. BROOKS, JAMES D. FRARY.

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