US1489368A - Scale - Google Patents

Description

April 8 1924. 1,489,368

. M. H. STARR SCALE Filed June 12, 19' '2 INVENTOR ATTORNEY Patented Apr. 8, 1924.

UNITED STATES PATENT OFFICE.

MORTON H. STARR, OF ST. JOHNSBURY, VERMONT, ASSIGNOR TO E. AND T. FAIRBANKS AND COMPANY, OF ST. JOHNSBURY, VERMONT, A CORPORATION OF VERMONT.

SCALE.

Application filed June 12, 1922. Serial No. 567,605.

To all whom t may Gomera:

Be it known that l, MoRToN H. STARR, a citizen of the United States, residing at St. Johnsbury, in the county of Caledonia and State of Vermont, have invented certain new and useful Improvements in Scales, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to scales, and more particularly to an adjustable counterpoise or back balance ball for use on weigh-beams ordinarily employed in connection with high capacity scales.

It is an object of the invention to provide an improved balancing device of the class mentioned which is relatively simple in construction, and reliable and exact in function under all conditions of service.

Another' object is the provision of an improved adjusting mechanism for the balance ball with locking mechanism therefor for securing the balance ball in adjusted position. y

Other objects will be in part obvious in connection with the following detailed description of an illustrative embodiment of the invention and in part pointed out hereinafter.

The invention accordingly consists of features of construction, combination of elements, and arrangements of parts, which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the appended claims.

In the accompanying drawings wherein a t ical preferred embodiment` of the invention is disclosed,

Fig. l is a side elevation of a weigh-beam equipped with the invention;

Fig. 2 is a central vertical longitudinal sectional view on an enlarged scale;

Fig. 3 is a rear end elevation; and

Fig. 4 is a transverse, sectional view taken approximately on the line 4-4 of Fig. 2 looking in the direction of the arrows.

This inventionis disclosedy in prior pending application for scales, Serial No. 441,544 filed February 1, 1921, and the present application is a division vof said prior application.

Referring now to the drawing for a detailed description of the embodiment there shown the weigh-beam 1 is supported upon a beam stand 2 attached to the upper surface of a beam shelf (not shown) and carries an adjustable poise 3 mounted for longitudinal adjustment along the weigh-beam. The weigh-beam is substantially channel shaped in cross section having downwardly extending flanges or side walls, presenting a downwardly facing channel opening. The beam stand 2 extends into the channel opening and carries spaced bearings. 4 contacting in supporting relation with knifeedge bearing 5 carried by the spaced walls of the weigh-beam, the latter being thus supported for pivotal movement on said bearings. A power transmission rod 6 extends from its connection with scale levers (not shown) to a connecting block 7 supported on knife-edge bearings 8 carried by the walls of the weigh-beam.

A back balance poise (not shown) is preferably suspended from the rear end portion of the beam by means of a rod 9 connected to a yolze 10. the latter being substantially U-shaped, disposed centrally of the beam walls and having spaced bea-ring blocks 11 pivotally supported by bearings 12 mounted in the walls of the weigh-beam. The walls are preferably apertured for this purpose. The vertically disposed legs 13 of the yoke 10 are outwardly turned at 14 forming supports for the bearings 11, and the walls of the beam are thickened at 15 providing ample supporting area for the lower bearing members 12. It will be seen that the stresses incident to the counterpoise weight are transmitted equally to the opposite walls of the weigh-beam. the resulting stress being in the central vertical plane. As will be understood, counterpoise weights are added or substracted from the counterpoise rod until the excess or deficiency in the balanced condition is within the range of the balancing power of the precise adjustment provided by an adjustable balance ball more fully hereinafter described.

Means for completing the precise balancing of the beam in zero or no load position is provided by a balance ball 16 movable longitudinally to adjust the center of gravity adjusting means normally urged to locking position, and manual means for releasing said locking means.

8. In combination, a weigh-beam, a balancing ball for said beam mounted thereon, niieans lfor adjusting said ball to balance said weigh-beam, locking means for said adjusting means normally urged to locking position, and manual means for releasing said locking means disposed adjacent said adjusting means tor sinniltaneous operating therewith by a single hand of the operator.

9. In combination, a weigh-beam having spaced walls, a counter poise, and means for connecting said counter poise to said beam including spaced pivotal bearings supported in said wall.

10. In a scale, in combination, a channel shaped weigh-beam having downwardly extending flanges or side walls, a balance ball bracket secured in the channel of said weigh-beam between said walls, and a balance ball adjustably mounted in said bracket. Y

11. In a scale, in combination, a channel shaped weigh-beam having downwardly extending :flanges or side walls, a bracket adjustably secured within the channel of said weigh-beam between said walls, a balance ball adjustably mounted in said bracket, means for adjusting saidbalance ball for varying the center of gravity of said weighbeam with respect to its supports, and a locking mechanism for locking said ball in adjusted position.

12. In a scale, in combination, a channel shaped weigh-beam having downwardly extending flanges or side walls and a transverse wall extending therebetween, a balance ball bracket adjustably secured to said transverse wall within the channel of said weigh-beam, a balance ball adjustably mounted in said bracket, means for adjusting said balance ball to vary the center of gravity of said weigh-beam with respect to its supports, and locking mechanism for locking said ball in adjusted position.

13. In a scale, in combination, a weighbeam, a balance ball for said weigh-beam, means for adjusting said balance ball for varying the center of gravity of said weighbeam with respect to its supports, a locking plate carried by said weigh-beam and lying adjacent said adjusting means, and a locking pawl controlled by said adjusting means and adapted to engage said locking plate to lock said balance ball in any adjusted position.

14. In a scale, in combination, a weighbeam, a balance ball for said weigh-beam, a rotatable shaft having threaded engagement with said balance ball for adjusting the same to balance said weigh-beam, operating means for said shaft, a circular locking plate carried by said weigh-beam and lying adjacent said shaft, a locking pawl controlled by said operating means and adapted to engage said locking plate to lock said balance ball in any adjacent position, and a push rod concentric with said adjusting shaft for reieasing said locking pawl.

15. In a scale, in combination, a channel shaped weigh-beam having downwardly extending flanges or side walls, a balance ball mounted in the channel of said weigh-beam adjacent said walls and being adjustable therein, and 'a U-shaped yoke for an additional balancing weight pivoted to the walls of said weigh-beam and spanning said balance ball.

16. In a scale, in combination, a weighbeam, a balance ball bracket for said weighbeam, a balance ball carried by said bracket, and means for adjustably connecting said bracket to said weigh-beam.

17. In a scale, in combination, a weighbeam, a balance ball bracket for said weighbeam, a balance ball carried by said bracket, means for securing said bracket to a wall of said weigh-beam for vertical adjustment, and means carried by said wall for guiding said adjustment.

18. In a scale, in combination, a weighbeam, a balance ball for said weigh-beam, means for adjusting said balance ball for balancing said weigh-beam, means for locking said balance ball in adjusted position, means associated with said adjusting means for operating said locking means, and means whereby said locking means is automatically moved to locking position following an operation of said adjusting means.

19. In combination, a weigh-beam having spaced walls, a balance ball supported between said walls, a counterpoise, and a U- shaped yoke for supporting said counterpoise spanning said balance ball, and having spaced pivotal connection with said walls.

In testimony whereof I aix my signa.- ture, in the presence of two witnesses.

- MORTON H. STARR. Witnesses:

PERLEY F. HAGEN, ALICE E. Cassini'.

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