US825279A - Platform-scale. - Google Patents

Description

PATENTED JULY 3, 1906. W. H. SANDERSON.

PLATFORM SGALE.

APPLIOATION FILED AUG. 21, 1902. BENEWBD'J'AH. 22, 1906.

To ctZZ whom, it may concern.-

"UNITED srATEs PATENT orrron.

WILLIAM HARLEY SANDERSOMOF DAYTON, OHIO.

PLATE'QRM-SCALE.

Specification of Letters Patent.

Patented Ju 1y 3, 19 c,

Application filed August 21, 1902. Renewed January 22. 1906. Serial No. 297,220.

Be it known that I, WILLIAM HARLEY SANDERSON, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful'lmprovements in Platform-Scales, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to improved means for connecting the platform, such as that of an ordinary platform-scale, with the lever system, so that such platform, with its load, is suspended from the lever system by connections universally movable as distinguished from bein supported on the lever system by bearings which are rigid with the platform.

The platform-suspending means when constructed according to my invention allows the platform to gravitate freely and to find its equilibrium of support in that central or process of weighing.

normal position which 18 necessary to secure reliability in the action of the scale ,in the The useful objects attained by the improve-.

Inent are, among others, a low support of those bearing-surfaces which are rigidwith the platform relative to the lever-system, the

said bearing-surfaces of the platform being below the knife-edges of the lever system which carry the platform and its load; such a free suspension of the platform on the lever 'systemas allows the platform to seek by gravity its normal and central position; to

' secure greater accuracy in the weighing operation; to do away with the necessity of check-links or chains to maintain the platform in its normal position and prevent its horizontal displacement relative to the lever system, and in such a suspended platformscale to allow of the convenient assembling and se aration of parts as may be required in manu acture, packing for shipment, reassembling,=-=&c.

Thefi'nvention, consists in the parts and 3 combinations thereof hereinafter set forth.

.In order to make the invention more clearly understood, Lhave shown in the ac companying drawings means for carrying the sameinto practical effect without limiting. my improvements to the particular construction which I have shown for the purpose of illustration.

In said drawings, Figure I is a vertical sec tional view'of so much of a platform-scaleas is necessary for an understanding of themvention, the platform and its suspension means being shown in elevation. Fig'L 'Z is a top plan. view of the same, partly broken away. Fig. 3 is an elevation on a larger scale, of one of the spider-legs and'connec'ted parts. piece with its supported links in sectionf Referring to the drawings, 'J 'indi'cates a suitable frame, such as a metallic casting, adapted-to contain and support the lever system and having at its top an openingor" openings under the platform to' allowthe free passage of portions of the platform to their connections with the lever system. The latter comprises two levers H H 'combined in the usual manner to receive the weight of the platform and its load atfour points and adapted to transmit the desired proportion of such weight to the scale-beam through a link H The said levers are provided with knife-edges I, which. are suspended by links E from staples f, attached to the Fig. 4 is a plan view of the bearing-.-

which are rigid with it arranged at'some dis tanee below said knife-edges. They 'are shown in the form of downwardly-dimeted and iounded or knife-edged hooks, the rear portions (1 of which are secured to thcbifurcations or legs a of the spider by screws, c f

The bifurcated legs of the spider are made longer than usual to bring the surfacesl fl'to the desired distance below the knife-edgesl. At a the parts a are provided with flanges'or shoulders abutting against the innersurfaces of the leg portions a.

B is a freely-movable bearing-block, preferably in the form ofa saddle and having a suitably recessed or. curved suri ace b, adapt-- ed to rest on the knife-edge I. At each side I of the latter'it is further provided with bearing-surfaces b and beyond the latter with flanges or heads 12 6 is a rounded lateral extension which limits the position of thebearing B on the limits, enabling the platform to assume by gravity that position which is desired and which is essential for an accurate performance of the functions of the scale and to resume or 'swing b ack to such position after any lateral displacement.

The links 0 are retained in position during any separation of the spider from the lever I systein by keeper-plates A", which are held beneath the parts a by the heads of the screws (1 or other suitable fastening and have extensions a beneath the lower ends of the links. Said extensions inclose or partly inclose the hooks with which the lower ends of the links engage and keep the latter in such engagement. The extensions a are preferably of spring metal, so that the links may be in serted into place or removed by slightly pressing the extensions outward or downward. The upper ends of the two links 9 are retained in place on the bearing B between its central elongated portion and the flanges b The distance between the inner ends of the parts A is such as will allow them to pass freely up at the sides of the knife-edge I whenit is desired to remove the spider from the lever system.

I am aware that suspension-bearings have heretofore been employed in the lever sys: tems of scales and do" not claim the same broadly, iy invention relating to the application of suspensioirbearings directly between the platform or its spider and the lever system, so that the weight comes initially upon the lever system through suspension means at more than two weight-distributing points.

For the adjusting and leveling of the spider the hearings A may have inserted beneath them one or more thin washers A Bv changing these washers for others of different thicknesses t ai-ings may all be regulated to the required height.

What I claim is I 1. In aplatforni-scale, the combination ti; .3 platform, the do\vnwardly extending supports arranged in pairs, projections extending toward. each other on each pair of supports and an upwardlyextending link embracin each projection, of a saddle-bearing loosely onnted in each pair of links, said bearings being curved upwardly and widened transversely between the links, a frame, platform-levers piv'otally supported by the frame and knife-edge hearings on the levers projecting into the upwardly-curved and transversely-widened portions of the bearings substantially as described.

2. In a platform-scale, the combination with the platform, the downwardly-extending supports arranged in pairs, hook-like projections extending toward each other on eachpair of supports and an upwardly-extending link embracing each projection, of a saddle-bearing loosely mounted in the upper end of each pair of links, said bearings having headed ends outside of the links, and upwardlyurved trans versely-widened portions between the links, a frame, platform-levers pivotally supported by the frame and knifeedge bearings projecting transversely from the levers and extending into the transverselywidened and upwardly-curved bearings; substantially as described.

3. In a platform-scale, the combination with the platform, the downwardly-extending supports arranged in pairs, detachable hook-like projections mounted. on and having shoulders resting against the inner faceo f each support, an upwardly-extending link embracing each projection, of a saddle-bearing loosely mounted in the upper end of each pair of links, and having upwardly-curved and transversely-widened portions netween the links and above the hook-like projections, a frame, platform-levers pivotally supported on the frame and knife-edge bearings projecting transversely from the levers and extending into the transversely-wic'lened and up wardly-curved bearings; substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM HARLEY SA. XDIIRSOX.

ICO

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