US1295967A - Tare-beam mounting. - Google Patents

Description

FAH. BUCKINGHAM.

TARE BEAM MOUNTING.

APPLICATION FILED APR. 2. 19m.

Patented Mar. 4,1919.

2 SHEETS-SHEET I.

5 0 BY 5.3 P 2AM aux/0L 'aglw ATT RNEYS.

F. H. BUCKINGHAM.

TARE BEAM MOUNTING.

APPLICATION FILED APR. 2, 1912.

1295,9617. I Patented Mar. 4,1919.

2 SHEETS SHEET 2.

I: \\\\m v m \\\\s s m a iii 1 y mii'lwmunu BY 4 W WEYS.

UNITED STATES PATENT OFFICE.

FREMONT H. BUCKINGHAM, 0F DETROIT, MICHIGAN, ASSIGNOR TO STANDARD COM- PUTING SCALE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

TAKE-BEAM MOUNTING.

Specification of Letters Patent.

Patented Mar. 4, 1919.

To all whom it may concern.

Be it known that I, FREMONT H. BUCK- INGHAM, a citizen of the United States, and residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and Improved Tare-Beam Mounting, of which the following is a specification.

This invention relates to means for counter-balancing plates, crates, casks and other receptacles employed to hold or contain articles being weighed and its object is to provide a simple and effective tare-beam structure which may connect to the load resisting rod of substantially every type of scale, which tare-beam construction will not readily get out of order, which may be entirely incased and be operated from without the casing.

This invention consists in combination with a pivoted tare-beam and a counterpoise slidable thereon. of the screw for moving the poise longitudinally of the tarebeam. said screw being connected to a driving mechanism co-axially with the fulcrum of the tare-beam, and a lever mechanism connecting said tare-beam to one of the load-resisting members of the weighing mechanism. This invention further consists in the details of construction illustrated in the accompanying drawings and particularly pointed out in the claims.

In the accompanying drawings Figure 1 is a rear elevation of the tare-beam mechanism and the connections between the same and a load-resisting portion of the scale. Fig. 2 is a section on the line 2-2 of Fig. 1. looking from the right. Fig. 3 is a section of the same line looking from the left. Fig. 4 is a section on the line 4-4 of Fig. 1. looking down. Fig. 5 is a section on the line 5-5 of Fig. 4, looking toward the right. Fig. 6 is a section on the line 6-6 of Fig. 4:, looking toward the right. Fig. 7 is an elevation of an anchor for one end of the connecting lever shown in Fig. 1.

a Fig. 8 is an elevation of the guide for the operating screw of the tare counter-poise. Fig. 9 is a view of an indicating mechanism. Fig. 10 is a detail of a stop mechanism.

Similar reference characters refer to like parts throughout the several views.

The load resisting mechanism and the weight indicating mechanism of this scale may be of any desired construction, for example of the same general character as that connecting the two rods 7 and 8 will be freely movable with these rods and will be adapted to tensional stresses or downward pulls on the rod 7 While the rod 7 may resist or support all the load in certain types of scales, only a portion of the load stresses may be transmitted to it by the lever mechanism of other types of scales; but this rod will be termed the load sup porting member hereafter, whether it supports all or only a portion of the load.

The mechanism is preferably entirely inclosed in a case consisting of the front 1, back 2 and ends 3 and 4. The front and back support the bearing 5 in which the fulcrum knife edges 6 are mounted. This fulcrum is in a vertical plane that includes the line of movement of the rods 7 and 8.

These knife edges extend from the double tare-beams 9 whose ends are connected to cross bars 10. The inner arms of these tare beams are providedwith work pivot knife edges 11 upon which rest the legs 12 of a yoke 13. Slidable on these beams 9 is a counter-poise 14 which has a slot 15 that it may straddle the rod 7 and not interfere with it. The screw 16 is threaded into the proper hole in this poise 14 and is adapted to move the poise longitudinally of the beams 9. This screw connects to a shaft 17 by means of any desired type of flexible joint or universal coupling 18, whose center is in the axis of the knife edges 6 and may therefore swing about the center of this coupling. This shaft may be turned by means of the handle 19 carried by a wheel 20 on the outer end of the shaft. The inher end of the shaft may be supported in the semi-cylindrical bearing 21, carried by brackets 22 secured to the front side 1 of the case. If desired, a bracket 23, having an adjustable end 24;, may be employed to support the intermediate portion of the shaft. Indicator wheels 25 of any desired construction and graduations, may be con nected to this shaftlb to indicate the number of revolutions and the divisions thereof of this shaft.

In order to relieve the coupling 18 from endwise thrusts, means may be provided for preventing endwise movement of the screw 16 relative to the tare-beams. I prefer to thread the reduced end 60 of the screw 16 and mount a ball 61 on this threaded end. A cupGQ'is formed on the end bar 10 and a plug 63 is held in place against this ball by means oft-he screw 64. The ball is ins erted from the right in Fig. l and screwed onto the part 60;

In Order to limit the revolutions of this shaft, small pins 26 and 27 may be mounted therein on each side of the bar 28, which is screwthreaded and turns on the screw threaded portion 29 of the shaft. The lower end of this'bar 28 is formed with the hole 31, shown in Fig. 10, which receives the pin 30 projecting from the wall 3 of the case. As this shaft is turned the bar 28 moves longitudinally thereof until a pin 26 or 27 engages a shoulder at the middle of this bar and thereby stops the revolutions of the shaft. It will therefore be seen that by turning this shaft 17, the poise 14021-11 be moved longitudinally of the beams 9 through distances which are indicated by wheels 25. and that because of the universal. coupling 18, the beams can swing on their pivots without friction.

Connected to the side 3 is a bracket 32 which supports the bar 33 carrying a pivot 34 at its upper end. The link 35 is mounted 011 this pivot and carries an arm 36 which c'onstitutes the bearing for the knife edge fulcrum 37 mounted on the outer end of the lever 38.

The connection between the rods 7 and 8 is as follows: The upper end of the rod 7 carries a pin a0 which is engaged by a yoke 41. The lower end of the rod 8 carries a pin 42 which engages the link 43 that is conn'ected to the yoke 41 by means of a pin 4A. If, as is shown in my former patent, the rod 8 is replaced by a number of rods, each of these rods may be connected to separate thin flexible plates 4-3. As the stresses on the rods 7 and 8 and the yoke 41 are always tensional, the link 43 can be made quite thin. The yoke 41 is open as shown in Fig. 3, and is formed with the bearings 45 for the work pivot knife edges 6 carried by the lever 38. Small pins 47 may be mounted in the notches in the yoke into which these knife edges 46 extend for the purpose of preventing them from slipping out. The yoke 13 may be formed with bearings at its upper end to receive the knife edges 48 carried by this lever 38. The lever 38 may be forked at its inner end shown in Fig. 3, and as shown in Fig. 2, carries. a pint) that extends through theouter end'of a linkto'in alinementwith the load'pivotdS. This link may be forked at its inner end, shown in Fig. 3 and connects to the inner end of the arm 52 by means of. a stationary pin 53. The arm 52 may be secured to a post 54: by means of a screw 55.

lVhen the rods 7 and 8 move up and down the lever 38 will swing up and down on its fulcrum 37. The link 50 will cause the yoke 41 to move in a perpendicular path and the pivot 3% will permit the fulcrum 37 to swing laterally under the thrust of the link 50. lVhen the poise 1'4: is central, that is, the center of gravity of the poise, the tare-beams and the parts connected to the tare-beams coincide with the axis of the knife edges 6, then the rods 7 and S will move freely. But as the poise is moved outward, increasing resistance is offered to the movement of'these rods 7' and 8.

While the details of construction may all. be changed without departingfrom the spirit of my invention, certain fundai'nental rules may be observed in order to obtain satisfactory results. The pivots 37 and 53 may be in a line at right angles to the line of move ment of the rods 7 and 8. The pivots 37, 3 and to must be in a straight line. The length of the lever arms 37;L8, t8%5, 49-53 and 1l6 may be equal and the pivots 4S and 49 must be in al'inen'ient. The length of the strut 11-l8 should be equal to the distance between the pivots 6 and 53. The pivot will always move in a vertical line, and the movement of the pivot 37 will be so nearly in a horizontal. line that any variation therefrom may be disregarded. Because of the angular movements of the tare beams, of the lever 38 and of the link 50 being equal, the yoke 13 will always be vertical. As a result, the downward thrust of. the poise let. will be transferred into an upward thrust of the pivot 45 of exactly the same force, and this will be entirely irrespective of the angle between the tare-beams and the line of movement of the rods 7 and 8. It will be apparent that this tare-beam mechanism is operative in connection with automatic scales in which the load resisting mechanism moves through increasing distances with increasing loads on the scale.

I claim;

'1. In a taremechanism for scales,.the coinb'ination of a vertically movable load-supporting rod, a "yoke connected thereto, a lever having knife edges at its ends and intermediate its ends, a pivotal 1y movable abutment having a bearing for the knife edges at one'end-of the lever, the lknife edges of the other end of the lever engaging said yoke, a pivotally mounted tare-beam and a poise slida-ble thereon, 'sa-id tare-beam having arms provided with knife edges positioned below the knife edges intermediate the ends of said lever, and a compression member extending between the said knife edges at the ends of the arms of the tare-beam and the knife edges intermediate the ends of the lever.

In a tare mechanism for scales, the combination of a vertically movable load-supporting rod, a yoke connected thereto, a lever'having knife edges at its ends and intermediate its ends, a pivotally movable abutment having a bearing for the knife edges at one end of the lever, the knife edges at the other end of the lever engaging said yoke, a pivotally mounted tare-beam and a poise slidable thereon, said tare-beam having arms provided with knife edges positioned below the knife edges intermediate the ends of said lever, a compression member extending between the said knife edges at the ends of the arms of the tare-beam and the knife edges intermediate the ends of the lever and manually operable means to slide the poise along the tare-beam.

3. In a tare mechanism for scales, the combination of a vertically movable loadsupporting rod, a yoke connected thereto, a lever having knife edges at its ends and intermediate its ends a pivotally movable abutment having a bearing for the knife edges at oneend of the lever, the knife edges at the other end of the lever engaging said yoke, a pivotally mounted tare-beam and a poise slidable thereon. said tare-beam having arms provided with knife edges positioned below the knife edges intermediate the ends of said lever, a compression member extending between the said knife edges at the ends of the arms of the tare-beam and the knife edges intermediate the ends of the lever and a manually operable screw engaging the poise to slide it along the tare-beam.

4:. In a tare mechanism for scales, the combination of a vertically movable loadsupporting rod, a yoke connected thereto, a lever having knife edges at its ends and intermediate its ends, a pivotally movable abutment having a bearing for the knife edges at one end of the lever, the knife edges at the other end of the lever engaging said yoke, a pivotally mounted tare-beam and a poise slidable thereon, said tare-beam having arms provided with knife edges positioned below the knife edges intermediate the ends of said lever, a compression memher extending between the said knife edges at the ends of the arms of the tare-beam and the knife edges intermediate the ends of the lever, a screw engaging the poise to slide it along the tare-beam, a shaft to turn the screw, and a universal coupling connecting the shaft and screw, the center of the coupling being in the line of the fulcrum of the tare-beam.

In a tare mechanism for scales, the

combination of a vertically movable loadsupporting rod, a lever having one end pivotally connected to the rod, a bearing to receive the fulcrum at the opposite end of the lever, a tare-beam fulcrumed intermediate its ends and a counterpoise slidable toward one end from the fulcrum, said tare-beam having an arm extending in the opposite direction, and a compression member between a pivot at the end of'said arm and a pivot on said lever.

6. In a tare-mechanism for scales, the combination of a vertically movable loadsupporting rod, a lever connected at one end thereto and adapted to be swung through a vertical are by said rod, a tare-beam and a poise thereon, and a connection between the lever and the tare-beam through which the tare-beam and the lever are caused to swing through equal arcs and the weight of the poise may resist the movement of said rod caused by a load on the scale in proportion to the distance of the weight from the fulcrum of the tare-beam irrespective of the inclination of the tare-beam.

7. In a tare-mechanism for scales, the combination of a vertically movable loadsupporting rod, a lever connected at one end thereto and adapted to be swung through a vertical are by said rod, a link pivoted at one end and pivotally connected to the other end of the lever, a second link pivoted at one end and pivoted at the other end to said .lever intermediate its ends to limit the endwise movement of the lever, a tare-beam pivoted intermediate its ends, a poise slidable on one arm of said beam, and a compression member between the other arm of said beam and said lever whereby the downward movement of the rod may be transmitted to the tare-beam to cause the poise to be raised.

8. In a tare-mechanism for scales, the combination of a vertically movable loadsupporting rod, a lever connected at one end thereto and adapted to be swung through a vertical are by said rod, a bearing for the fulcrum of the lever, a tare-beam and a poise thereon, a connection between the lever and the tare-beam through which the tare-beam and lever are caused to swing through equal arcs and the poise may resist the movement of the rod caused by a load on the scale, in proportion to the distance of the weight from the fulcrum of the tare-beam irrespective of the inclination of the tare-beam, and. a screw mounted in said poise to slide the same on the beam.

9. In a tare-mechanism for scales, the combination of a vertically movable load.- supporting rod, a lever connected thereto and adapted to be swung through a vertical are by said rod, a bearing for the fulcrum of the lev r, a tare-beam and a poise thereon, a connection between the lever and the tare-beam through which the poise may resist the movement ofthe rod caused by aload-on the scale, a screw mounted on thebeam and en gaging said poise to slide-thesame on the beam, a manually operable shaft, and a universal coupling between the shaft and screw.

10. In a tare-mechanism for scales, the combination of a vertically movable load-- supporting rod, a lever connected thereto and adaptedto be swung through a vertical are by said rod, a bearing for the fulcrum of the lever, a tare-beam and a poise thereon, a connection between the lever and the tarebeam through which the poise may resist the movement of the rod caused by a load on the scale, a screw mounted on'the beam and engaging said poise to slide the same on the beam, a manually operable shaft, a universal coupling between the shaft and screw, and means to limit the number of revolutions of said shaft and screw.

'11. In a tare-mechanism for scales, the combination of a vertically movable loadsupporting rod, a lever connected thereto and adapted to be swung through a vertical are by said rod, a bearing for the fulcrum of the lever, a tare-beam and a poise thereon, a connection between the lever and the tare-beam through which the poise may resist the movement of the rod caused by a load on the scale,.a screw mounted on the beam and engaging said poise to slide the same on the beam, a manually operable shaft, a coupling between the shaft and screw, means to limit'the number of revolutions of said shaft and stationary bearin s therefor and screw, and means to indicate the position of the poise on the tare-beam.

' 12. In a tare beam for scales, the combination of a frame, a tare-beam. fulcrumed thereon, aload supporting rod movable in a vertical plane passing through the tarebeam fulcrum, a lever fulcrumed at one side of said plane and having a work'pivot engaging said rod in said plane, a movable bearing forthe fulcrum of said lever, a link for causing-the workpivot-on said lever-to move in saidplane, a load pivot on said lever midway between its fulcrum and the work pivot, said link connecting to a pivot on the lever in alinement with the load pivot, a stationary pivot for the opposite .end of said link and located in said plane and in a second plane at right anglesthereto which passes through the fulcrum of the lever, a vertical strut extending between the load pivot of the vlever and a work pivot on-the tareebeam, the work arm of the tare beam being equal to the load arm of the lever, and the length of said strut being equal to the distance between the fulcrum of the5tarebeam and the stationary pivot of said link.

13. in a scale, the combination of a vertically movable load supporting rod, a lever connected at one end of said rod and adapted to be swung thereby, a tare-beam, and a connection between the lever and one end of the tare-beam whereby the lever and tare beam are caused to swing through equal arcs.

let. In a scale, the combination of a vertically movable load supporting rod, a lever connected at one end to said rod and adapted to be swung thereby, a tare-beam, and a connection between the lever and one end ,of the tare-beam whereby the lever and FREMONT H. BUCKINGHAM.

Copies ofthis patent may be obtained for five cents each-by addressing the Commissioner of Patents, Washington, I). Q.

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