US1544346A

US1544346A - Beam box for scales

Info

Publication number: US1544346A
Application number: US700544A
Authority: US
Inventors: Melvin S Reynolds
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-03-20
Filing date: 1924-03-20
Publication date: 1925-06-30
Anticipated expiration: 1942-06-30

Description

June 30, 1925.

M. S. REYNOLDS BEAM BOX FOR SCALES Filed March 20, 1924 3 Sheets-Sheet 1 IJII h l ldlll l r III Q\ mnvgaazs June 30, 1925.

M. s. REYNOLDS BEAM BOX FOR SCALES.

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WITNQQJEs M. s. REYNOLDS BEAM BOX FOR SCALES Filed March 20, 1924 3 Sheets$heet 5 Patented June 30, 1925.

UNITED STATES MELVIN S. REYNOLDS, OF'WOODLAWN, PENNSYLVANIA.

BEAM BOX FOR SCALES.

Application filed March 20, 1924. Serial No. 700,544.

To all whom it may concern:

Be it known that I, MELVIN S. REYNOLDS, residing at Woodlawn, in the county of Beaver and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Beam Boxes for Scales, of which improvements the following is a specification.

My invention relates to improvements in the structure of weighing scales. I have developed it in application to what is called the scale box, which constitutes a fixture applied to and forming an essential part of the car in which the material for charging a blast furnace is gathered from the storage bins, and from whichthe skip receives the material to convey it to the furnace top. It is requisite that the components of the furnace charge be weighed into the car; the actual receptacle is really a scale pan, whose beam is fulcrumed in the car; one arm of this beam carries the receptacle, the other arm carries the weights successively imposed upon it as the increments of the charge are gathered. The scale box is the unit of apparatus in which the several Weights are successively imposed upon the scale beam. I shall describe my invention in this particular application, and the fact will be apparent that it is applicable to heavy-duty scales generally.

My invention is illustrated in the accompanying drawings, of which Fig. I is a view in vertical and longitudinal section of a scale box embodying my invention. Fig. II is a view in horizontal section on the plane indicated by the line IIII, Fig. I. Fig. III is a view in transverse vertical section on the plane indicated b the broken line IIIIII, Fig. I. Fig. IV is a view in broken transverse vertical section, the plane of section to the left is indicated at IV IV, Fig. I, and the plane of section to right is indicated at 1VIV, Fig. II. Fig. V is a view in perspective of a portion of a certain lever. Fig. VI is a fragmentary view in horizontal section, showing in plan from above the articulation of certain levers.

The scale box 1 is preferably made u as shown in these figures of steel plates bo lted together. It will be understood to be ri 'dly mounted in the frame of the car. Within the box is the scale beam. It here takes the form of a rectangular frame 2, fulcrumed upon posts 3, which rise from the bottom of the box as is clearly shown in Figs. I and II. From one arm, the arm on the left, as seen in Figs. I and II, the load is hung; to the opposite arm, the arm on the right, the weights are successively applied.

Both of the opposite parallel members of the frame are provided with oppositely extending accurately aligned pivot pins 4. Structurally indeed, there is but a single pivot pin for each of the frame members, it extends through, and so projects from opposite sides of the frame member. The pivot pins are made of suitable material for the purpose and are knife-edged in their engagement'with the bearing blocks. In correspondence to the doubling of the pivot pins on each side of each frame member, the posts 3 are bifurcated and provided with pairs of

bearing blocks

5, 5. These blocks 5 are self-ali ing, in the manner well-known to the art, 1n that one or both of them rests in the post upon surfaces of contact which are convex one to the other. Preferably one of each pair of bearing blocks is so constructed as to make convex bearing upon the post. Its upper surface, upon which the knife-edged pivot pin rests, is plane; the upper surface of the companion block is V-shaped. The frame itself is made preferably of bronze; the knife-edged pivot pins of special pivot steel, and the bearing blocks of tool steel.

To one armof the frame 2 which constitutes the beam properly so called, the weight is hung. As has been said, the receptacle of the car is itself the scale pan, and it is hung from this beam through a compound lever mechanism, the character of which willbe understood and need not here be explained.

. Suffice it to say that through an orifice 6 in the bottom of the scale box 1 extends the stem 7 of a oke which is hung upon one arm, the left-hand arm of beam 2 as seen in Figs. I and II, and it is through this yoke that the weight of the receptacle with its burden is brought to bear on the scale beam. The two arms 8 of this yoke are each of them bifurcated, and through the bifurcations extend aligned orifices 9 into which orifices extend from opposite sides of each of the parallel members of the beam 2 the pivot pins 10. The pivot pins 10 like the pivot pins 4 extend through the frame members and extend oppositely, on either side. The too are formed of special pivot steel, and they too are lniifeedged. The edges, however, are upwardly directed. The bifurcated terminals 11 of the arms of the yoke are formed of forged steel. and it is the upper inner curve of the orifices 9 which constitute the bearing surfaces, as illustrated in Fig. I.

I have spoken of the frame 2 as the scale beam, and so it properly termed. The scale box, however. includes a plurality of what may be called subsidiary or auxiliary scale beams 12. These auxiliary beams 12 are ca iable of being shifted each by itself so that each alternately may stand either removed at an interval above and free of frame 2 and take no part in the operation of weighing, or may come. to rest upon the frame, and so for the time constitute part of the actual and effective scale beam. Each of these auxiliary beams 12 is provided with an adjustable weight 13. The beam is calibrated and the weight is adapted to be adjusted with nicety to the position to afford the desired counterpoise when the auxiliary beam 12 which carries it is brought to position upon frame 2 and so made in effect part of the scale beam.

These several auxiliary scale beams 12 are held in an elevated position and remote from frame 2 by pairs of crotehed vertically reciprocating bars 1-Ll-. These pairs of bars 1d travel in unison in ways prepared for them in the ends of the box. and they engage the auxiliary scale beam at its ends. and as they rise and descend they alternately raise the beam free of frame 2 and deposit it upon the frame, so that for the time it becomes effective as part of the scale beam. In Fig. I of the drawings one auxiliary scale beam 12 is shown in elevated position and free of frame 2.

lVithin the box and pivoted upon posts 15 and 16 are pairs of levers. 17 and 18. The arrangement is that shown in Fig. l. The levers severally are approximately half as long as the box. At the middle of the box the two levers of the pair engage one another by the tongue and groove toggle ioint indicated at 19, which permits play in longitudinal direction as the levers swing. There is a pair of these levers for each auxiliary beam 12. At the remote ends the

levers

17 and 18 are pivoted to the opposite crotched bars 14 which, movable vertically in unison, are adapted by such movement to raise and lower an auxiliary bar 12, in the manner already described. The ways in which the 'bars 1% reciprocate allow for the slight play of the lower ends of the bars 14, in the direc tion longitudinal of

levers

17 and 18, a play incident to lever swing. These

levers

17 and 18 are formed advantageously of malleable iron.

For each pair of lovers 1'7. 18 there is a manually operable shifting lever 20. These levers 20 are shown arranged in a bank, as

they appear in elevation. They extend through the box wall and are pivoted on suitable lugs formed internally upon thebox Wall to carry them. Each of these levers at its inner end is stirrup shaped, and the two arms 21 of the bifurcation extend on eitlrer side of the proximate and outer end of one of the levers 17 and 1.8. in this case, one of the levers 18. A pin is carried by the stirrup, extending between the bifurcations, and it extends through a slot formed in lever 18 to receive it. The wall of this slot is so particularly shaped that as lever 20 is swung on its pivot manually back and forth between two extreme positions, lever 18, and with it lever 17 will be swung between the two extreme positions shown in Fig. I. And in consequence the corrcspoiuling auxiliary beam 12 will be alternately raised clear from and deposited upon frame 2. The levels 20 are preferably made of malleable iron. The pins 22 may ad *antageously be secured in the stirruped ends of levers 2( by cotter-pins 24:, and so the assembly may readily be taken down for purposes of replacement; and repair. Fig. VI shows in plan from above the articulation of lever 20 to lever 18, and it may be seen on comparing this figure with Fig. I, that the stirruped end of the lever 20 carries the pin 22, and that the pin so carried extends transversely through the slot 2 while the slot 23 is an elongate slot with properly curved walls formed in the enlarged end of the lever 18. And it will be particularly perceived that the strains of lever shifting, which are imparted from lever 20 to lever 18, center in the plane indicated by the line (i?), Fig. VI.

Scale boxes of this general form are old and my invention found in improvements upon the old structure. The slot-andpin engagement between the manually shifted levers 20 and the transmission levers l8, and the corresponding centralization of strain througlwut the mechanism which etl'ects the raising and lowering of the bars 12, eliminates twisting strains, and this reduces wear, and loss of time consequent on the necessity for repair is greatly reduced. The cotterpin connection renders the structure accessible for repair, to the extent that repair is needed, and no further. The whole assembly need not be taken down to make replacement of a single part. This feature, together with standardization of parts, still further reduces the time and work needed for making repairs. Finally. the rigidity gained throughout gives increased accuracy in weighing and more permanent and enduring accuracy.

The operation will easily be understood. The car is shifted and brought opposite a particular bin, and a particular lever 20 is shifted, and a particular auxiliary beam 12. whose weight has previously been accurately placed, is applied to and made part of the scale beam. Material from the bin is fed into the car until in the scale box indication is iven that the desired weight has been ad ed. The car is then shifted to the next bin, another lever 20 is shifted, another auxiliary beam 12 is added to frame 2, another increment of weight is added to the weight arm of the beam, and again material is fed from the bin until in the scale box indication appears that the desired weight is added. So on until the load is made up.

I claim as my invention:

1. In a scale box a pivoted frame adapted to receive an auxiliary scale beam applied to it, a movable scale-beam support adapted in one position to support a scale beam and in moving to alternate position to deposit upon said frame a previously supported scale beam, a scale beam adapted to be borne alternately by said frame and by said scale-beam support, a manually-controlled pivoted lever, and a transmission lever interposed between said beam support and said manually-controlled lever, said transmission lever and said manually-controlled lever being mounted to swing in a common medial lane and being connected one to the other by slot-and-pin connection, the bearing surfaces of said slot-and-pin connection extending transversely across and being centered in such common medial plane.

2. In a scale box a pi-voted frame adapted to receive an auxiliary scale beam applied to it, a movable scale-beam support adapted when in one position to support a scale beam and in moving to alternate position to deposit upon said frame a previously sup ported scale beam, a scale beam adapted to be borne alternately by said frame and by said scale-beam support, a manually-controlled pivoted lever, and a transmission lever interposed between said beam support and said manually-controlled lever, said transmission lever being slotted transversely and said manually-controlled lever being bifurcated transversely and carrying in its furcations a pin which in the assembly extends through the slot in said transmission lever.

3. In a scale box a pivoted frame adapted to receive an auxiliary scale beam applied to it, the said frame including opposite parallel members each pivoted to a support, the strain of pivoting being centered in the median vertical lane of the frame member, an auxiliary sca e beam, a movable carrier for the auxiliary scale beam, arranged on a common central plane with said beam, a manually operable shifting lever for said carrier pivoted in a suitable support and arranged also in a common central plane with said beam and carrier, said carrier and said shifting lever engaging one another over bearing surfaces which extend across and are centered in such common central plane.

In testimony whereof I have hereunto set my hand.

MELVIN S. REYNOLDS. Witnesses:

JAs. G. B. Roman, Josnrn H. TURNEY.