US78748A - Improvement in hollow-headed - Google Patents

Description

L F. KEELER.

Scale- Beam,

Patented June. 9, 1868.

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JOEL KEELER, OF PITTSBURG, PENNSYLVANIA.

Letters Patent No. 78,748, dated am '9. 1868.

IMPROVEMBN I HOLLOW-BEADED souseams,

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TO ALL wHoM'iT MAY. CONCERN:

Be it known that I, Jon F. KEELEB', of the city of hittsburg, county-of Allegheny, and Stateoi' Pennsyl- Vania, have invented a new and improved Mode of Constructing"Hollow-Headed Scale-Beams, and of adapting them to platform scalesj 'audI do hereby'declare that the 'followiiw' is a -fulland exact description thereof,

reference being h'adito the accompanying drawings; and to the letters of reference-marked tbcreon.. I The nature of my invention consists in constructing hollow-headed scale-beams in such a manner that, ;while the weight and the fulcrum are brought near to eahh other, they are nevertheless kept on separate pivots, held firmly in their 's espe'ctive places, and in constructing platform-scales so as to rest 'the fulcraof the main beams on fixed bearings, while, at the same time, suspending the weight on platform-b'earings that-oscillate, or viceversa. I p I To enable others skilled in the art to make and use my invention, I will proceed to describe its'con'st-rue tion and operation. I v

I make my beam'sa-nd scales in anyknown form, and of any known material or combination thereof; but I usually prefer to make them partly of cast and partly of wrought iron, with caststeelpivots and bearings, Thus, I make my beam, a, with a. hollow head, so called because .of the space, a. a a a, in it, in which the link-bearerf hangs. I) is an adjustable piece, holding the minor pivot d suspended in the link c. t is the pivot, on which the article to be weighed usually hangs by means of the platform female hearing or linkfand the link-bea'rerf. I dis the steel pivot, usually forming the fulcrum of the lever. This s'teel pivotis supported, throughout its entire len'gth,by a cast-iron projection, d, which projection holds the steel pivot, after the pivot is filed, fitted, and hardened; firmly in its place. The linkf, in the li-nk-beurerf', 'is usually made, of cast iron,

with a steel female bearing cast into it, though frequently of wrought iron andsteel, and hardened, and hangs by the link-pin 1'", which pin passes through thelink-bearerf, and through a hole in the"li nk, socountersunk on each side as to permit it to oscillate freely on that pin in any direction. These oscillations are shown by the red lines o 0, Figure Hollow-headed scale-beams are usually made for .weighing' large weights, and the pivots or bearings are apt to work loose, if not bend orbreak, unless held by more than one end of the pivot. To obviate this difii cnlty, I- made, in my patent of July 12, 1864, the respective pivots, forcboth the'fulcrum and the weight,'.in one and the same piece of metal, the fulcrum-pivots on the outside of the head, and th'e'weight pivot on the inside; but this construction is not only diflicult'to make, and liable to inaccurate adjustment by reason of the warping or springing ofthe metal in prbcess of hardening,'hut also necessitates the weakening 'of the beam bymaking through the'headgo large a hole as is necessary for passing through it so large a piece of metal. Now, in order to obviate all these'difiiculties, I makeeach of the outside fulcrum-pivots of only.a small-sized piece of steel, cl, and support it, throughoutits entire length, by'a cast-iron projection, d, from the outside of the beam-head. This mode of construction is the more necessary for hollow-headed beams, because the making of the two sides of the hollow head of suflicient thickness to'hold in the pivots firmly would require such an amount of metal in the head as to unfit it for use, especiallyas a portable scale-beam.

By combining therfixed studor bearing a with the platform link-bearerf, I am enabled to make a strong scale of a very shallow depth, to leave the platform suspended freely, butwithout so much motion as to require check-rods, and also .to cover all the machinery from dust, water, &c., by the platform, items of great impor tance, especially in large outof-d oor soales, exposed to snow and ice as well as dirt.'

' In using'the hollow-headed scale-beam as a platform or primary beam or lever, in constructing platform scales made with compound levers, I connect such hollow-head scale-beamsnith' any known device which will permit of oscillation, either of the beam itself, or of theweig'ht placedon' it, or both. Thus, if it is designed that the weight and the platform on which the weight rests shall oscillate, then that weight is placed on some device operating like the link-beurersf', whether that linkbearer an'd linkf are connected with the inside pivot e, and the beam rests on the stud a, by means of the outside pivots, d dC-or whether the arrangement isreversed, and the beam rests on a 'stud, by means of an inside pivot, while the link-bearer and links are attached to the scales, substantially as described.

outside pivots, in which, latter case the relative positions of such inside and outside pivots would usually be exchanged. If it is intended that the beam (when used as a platform-lever in a compound-platform scale) alone shall oscillate, then the fulcra or pivots d d will usually be suspended in links or other vibrating=devices, and the weight or platform will rest on the inside pivot without the intervention of the linkf or other vibrating device; but, if it is desirable to have both the lever and the weightto oscillate, then both the inside and the outside pivots will have vibrating-devices,

When desirable to have the lovers oscillate, as in case when the studs happen to stand on a yielding foundation, or on one not entirely firm, then, in order to obviate any danger of the stud yielding, and thereby causing a. pinching or cramping of the pivots in the beam, I invert the combined link-bearer and link, and use two sets of them in .such inverted position, instead of the fixed stud a, for the outside pivots d d to hang in. I then use either a'link-bearer and link in an upright position on the inner pivot, e, or I use an inverted fixed stud of any known form,at will. t p

i 'Inotice thesefea'tures thus definitely, because either the platform or the levers, or both, in a. platform-scale, must be susceptible of oscillation or the scale will not act, and because the methods of securing such oscillation are too numerous to be shown. I

I do not claim the invention of the hollow-head scale-beam, nor its use as a graduated vibrating-beam, but not limiting myself to any particular mode of construction of hollow-headed scale-beams themselves, or of their attachments, (fitting them for use as primary levers in constructing compound platform scales,) nor to any mode of combiliing them, as primary beams, with other beams, of similar or dissimilar construct-ion, for producing such scales- 1. Adapting hollow headed scale-beams, of any known constnuctiom-to use as primary levers in the con st'ruction of compound-lever platform-scales, substantially as herein described. 7

2. I-claim the use of the combined link-bearerf and linkf, in the construction and operation of platform- JOEL F. KEELER.

Witnesses:

A. S. NICHOLSON, W. N. Pnxr'ou.

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