US1169929A

US1169929A - Torsion-balance scale.

Info

Publication number: US1169929A
Application number: US3304815A
Authority: US
Inventors: George M Conway
Original assignee: Torsion Balance Co
Current assignee: Torsion Balance Co
Priority date: 1915-06-09
Filing date: 1915-06-09
Publication date: 1916-02-01
Anticipated expiration: 1933-02-01

Description

s. M. CONWAY.'

TORSION BALANCE SCALE.

APPLICATION FILED JUNE 9,1915- Patented Feb.1,v1916 THE COLUMBIA PLANOGRAPH C0., WASHINGTON. D. c.

E UNITED Arredamomc.

GEORGE M. CONWv AY, OEJERsEY Crrv, NEW JERSEY, AssreNoE, To THE 'roEsroN' BALANCE COMPANY, CE NEW YORK, N. Y., a CORPORATION OE NEW YORK.

Application filed I une 9,` 1915.

y To all whom t may concern.' y

Be 1t vknown that I, GEORGE M. CONWAY,

a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Torsion- Balance Scales, of which the following is a specification. i I

This invention relatesfto scales or balances of the torsionA type. The connections between the various parts of the balanceare afforded by means of stretched wire or ribbon which twists slightly `with the rocking movements ofthe beam. f

The wire or ribbon (hereinafter referred to by the term wire7 or tension wire) is usually tightly stretched around a truss frame of metal, the ends ofthe wire being joined together in such manner that the wire is substantially continuous. These truss frames, preferably, three, are connect ed to the scale beam, which generally is comprised of a pairof parallel beams, by` clamping the wire to the beams, the trusses being normally disposed in parallel relation in vertical planes. One of the trusses, usually the centermost, is held stationary and affords the fulcrum or center support of the balance, the end trusses serving to support the scale pans. Y n l The object of the -presentl invention is to provide means for adjusting the clamps in such manner that both' end trusses may be equidistant from the fulcrum truss, that parallel relation of the parts be assured, and

interchangeable construction made feasible.l

`In the drawings accompanying this specilication, one practicable embodiment ofthe invention is illustrated.

In such drawings,-`Figure-1is a longitudinal section of a balance scale equipped with the present improvement. rIhe plane of this section is represented by' the line 1 1 in Fig. 2. Fig. 2 isvan endelevation vof the mechanism and a cross section Of the housing, taken On a plane at about the line Q-Q of Fig. 1'; Fig. 3 is an enlarged longitudinal section througlrone of Vthe beam ends and Vthe wire clamping device; and' Fig. l is a longitudinal section through the center of one of the beams showing the fulcrumwire clamping device. t

In the illustration, the base 1s represented by the reference character 5, which is'of some suitable construction, The working Specification of Letters Patent.

Patented Feb. 1,1916; serial No. 33,048.

parts are shown housed by means of a top plate 6 resting upon a sheet metal side wall 7 which is supported by the base.v The fulcrum truss S is shown carried by standards 9 rising from the base. A pair ofbeams is illustrated, designated by the reference characters 10-10. These beams are shown in parallel relation and disposed one above the other and each having its fulcrum at about its longitudinal center.` 'Ihe upper and lower fulcruinwires 11-11-of the fulcrumtruss 8 are show-n clamped to suitable tension wire seatsprovided on the upper f and lower beams respectively. In the pres-v ent illustration each beamis above the fulcrum wire to Awhich it is clamped. An en-v larged detail of the fulcrum wire clamp is illustrated in Fig. 4. The lower side of the beam at its center portion is shown recessed at `12 for receiving one of the clamp members 18, between which clamp: member and the clamp member 14 the wire is held in position.l Screws 15, l5, are shownmov-- able freely through the beam and the clamp member 13, and having screw-threaded con-Y nection with the clamp member 14:.,v .These screws are shown disposed on each side vof the wire seat, which seat in the present in-A stance is vat the bottom ofa recess. 16 toward which the wire is pressed by arib 17 carried by the clamp-` member .14. A set screw l18 is shown preferably. located medially of the Vbeam and having screwthreaded connection therewith. The screw 18 coposes'of adjustment, which will behereinafter explained. Y i' The ends `of the beams-aty each YsideV are shown `connected by trussesV 19,'l each of'I which is provided with kupper and lower wires 20 to which the ends of the beams are clamped. A detail of the clamp isillustrated in Fig. 3. The clamp is shown as comprising a slide 21V preferably formed of sheet metal andhaving a portion disposed on the upper side and a portion. disposed on the lower side of the'end of the beam. I-Ioles are formed through the member 2l and the end of the beam for accommodating'the body portion of the set-screws 22. Such holes are so formed that ,considerable-clearance. is afforded. The wirev 2O is shown clamped against the under side of the slide 21 by means of a clamp plate 23 having screwthreaded connection with the ends of the `Setsscrews 2:2.

For the satisfactory working of a balance of this character it is necessary that the trusses be placed at the proper distances one from the other, the beams be maintained in parallelism, the trusses be maintained in paralle'lrelation, and the wires be free from strains other than those incident to the balancing of the device. If, in setting up the device,it is found that one of the end trusses is out of position, or in its usual mode of operation is not in a vertical plane, the clamp as a 4whole on the end of the beam will be moved inwardly or outwardly of the beam untill afproper position is effected. At times it'uisidesiif'able to move one or both of the wirerseats carriedbythe clamps at the end offthe'b'eani toward or from the center or fulcrum of the beam. vThis movement can be@accomplished without unclamping the wirei20.` `Such inward and outward movement of the clamp is effected by means of an" adjusting screw 26 engaging a screwthreaded socket` in the end of the beam and having `a neck portion @+L inwhich the edges 25' ofthe ends of the slide 2l are located. Adjustment in someinstances is effected by one'clamp and in `others by the use of sere al of the-clamps. "By reference to Fig. 2 it will een thatthe end ofthe slide is notched sothat in assemblingthe clamp, the screw 26 is placed in its socket and the slide 21. appliedby a lateral movement. 1When in place,l the clamp screws 22 prevent its disengagement from the adjusting screw 2G. If thesetlfscrews 2Q arel set ldown so tightly that itisimpossible or diflicult to effect the adjustment by l,means of the adjusting screw 26,f ofcourse they can be backed voft to such extent tliat'theV adjustment may readily be effected withoutv'unclainping or releasing the wire.

i It is desirable that the wires at each end and the center of` each beam, (in `the present illustrationsthe wires QO-QO and 1l) shall, when the trusses are of uniform height, be on the same plane, or that their clamping l seatsshallbeoii-the sa'mevplane. It is very diiiic'ultin making interchangeable parts, to produce-the Yclamping seats for the wires in exactlyt'he saine plane. The adjustment of the clan1p`in the vmanner shown in Fig. 4 is foretl'ecti'ng the"v adjustment and alinement oftheclamp faces.` It will be seen that by releasing or advancing the screw 18 the clamping face for the wire 11 may be raised or lowered. `-Acljusting means is thereby provided for adjusting the fulcrum or intermediate tension wire seat in a direction perpendicular to the beam and the plane of the endV seats. IIn some instances it may be foundnecessary to tilt the wire or clamp seat, in which case one or the other of the Screws 15 may be set down harder than the other, as will be apparent, to rock the clamp seat into the desired position.

It will be apparent that as each end of each beam is provided with means for adj usting the clamp or wire seat longitudinally of the beam, that the adjustment of the end trusses into their proper parallel vertical. positions may be readily iccomplished, ir respective of the faults which may occur in the parts, particularly the beams, when manufactured by the `interchangeable system or when manufactured at different times.

llthough one embodiment of the invention is illustrated, vet it will be apparent that changes may be made within the scope of the claims without departing from tie spirit of the invention.

I claim as my invention :-u

l. ln a balance, a pair of parallel beams, a pair of trusses each having' on each of two opposite sides a tension wire, tension wire clamps carried by the ends of the beams, and means for adjusting one of the said clamps longitudinally of the bram carrying the same for adjusting the trusses into parallel relation.

In a balance, a pair of parallel. beams, a pair of trusses each haring on each of two opposite sides a tension wire, tension wire clzfunps carried by the ends of the beams, andl means for severally adj ustiug the clamps longitudinally of the. beams for adjusting the trusses into parallel relation.

f3. In a balance, a pair ol parallel beams, a fulcrum truss having on each of two opposite sides a tension wire` the beams being medially connected to said wires respectively, a pair of end trusses each` having on each of two opposite sides a tension wire, tension wire clamps carried by the ends of the beams, and means .for adjusting one of the said clamps longitudinally of the beam carrying the same for adjusting the position of the end truss relatively to the fulcrum truss.

4l. In a balance, a pair of parallel beams, a fixed fulcrum truss `having on each of two opposite sides a tension wire, the beams be ing medially connected to said wires respectively, a pair of end trusses each having on each of two opposite sides a tension wire, tension wire clamps carried by the ends of the beams, and means for severally adjusting the clamps longitudinally of the beams for adjusting the position of the end trusses relatively to the fulci'um truss.

l'ln a`balance, a` pair of parallel beams, a liXed fulcrum truss lhaving on each of two opposite sides a tension wire, the beams being` medially connected to said wires respectively, a pair of end trusses each having on each of two opposite sides a tension wire, tension wire clamps carried by the ends of the beams, means for severally adjusting the sa V clamps longitudinally of the beams for adjusting the position of the end trusses relatively to the fulcrum truss, a tension Wire clamp carried by each beam for engaging the fulcrum truss Wires, and means for mov ing the said clamps vertically in the general plane of such beams.

6. In a balance, the combination of three trusses each carrying a tension Wire, a beam, tension Wire clamps carried by the ends of .the beam, a tension Wire clamp carried by the center of the beam, and means for vertically adjusting the latter clamp.

7. In a balance, the combination with three trusses each carrying a tension Wire, a beam, tension Wire clamps carried by the ends of the beam, means for adjusting one of said clamps longitudinally of the beam, a tension Wire clamp kcarried by the `center of the beam, and means for vertically adjusting said clamp.

8. A beam for a torsion balance, said beam having a tension Wire seat at each end, an intermediate tension Wire seat carried by the beam, means for clamping tension Wires to the said seats, and means for adjustmg the said intermediate tension Wlre seat 1n a direction perpendicular to the plane of the end seats.

9. A beam for a torsion balance, said beam having a tension wire seat at each end, an intermediate tension Wire seat carried by the beam, means for clamping tension Wires to the said seats, means for 'adjusting the said intermediate tension Wire seat in a direction GEORGE M. CONWAY.

Witnesses:

THOMAS F. WALLACE, FRED WHITE.

(Luniesr of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.