US1516027A - Means for weighing loads - Google Patents

Description

Nov. 18, 1924.

H. E. scoTT 'MEANS FOR WEIGHING LOADS lm/enor:

Harry fcott.

H \s Aitor-neg hoisting -machine where a boom is hinged to i .L E: E. SCOTT, OF CLEVELAND, OHIO, ASSIGNOB TO THE BROWN HOISiTING MACHIN- ERI COMPANY, OF CLEVELAND, OHIO, A CORPORATION.

s roawnienine Loans.

Application led February 17, 1923. Serial No. 619,773.

To all whom t may-concern: f

Be it known that I, Hana SCOTT, a citizen of the United States, residing in the city of Cleveland, county of Cuyahoga, and State of Chio, have invented a new and useful Means for Weighing Loads, of which the following is a full, clear, and exact Vdescription, reference being made to the .accompanying drawings, which form a part of the specifications, wherein similar parts are designated by the same numerals in each case.

The' invention relates to and comprisesy such forms yof machines and mechanisms as overhead cranes, man-trolleys, rope systems, bridge tramways,land boom cranes of all kinds, wherein loads are hoisted lor lowered vertically by means of load-sustaining pulley-systems and winding drums, and, .with appropriate adaptations, it is directly applicable to any such.

In order to understandingl invention for the purpose el illustrate the this application, l have taken a form of the invention that is represented in a combination of the same with a revolvable crane, a class of one side of the supportin frame, and is movable vertically about suc point.

In consequence of the variable radii of the booms however, aswell as the changeable relation of the same to the crane body itself, such machines are neccessarily provided with special ballast so disposed upon the I body as to counter balance the overhang of the boomwhen at certain pointsof its vertical or horizontal movement. i

Such type of machine therefore, will not only be serviceable in explaining the invention in its broader sense, but, because of the ballast feature peculiar to `that type, will further illustrate particular combinations, covered by corresponding claims l make, wherein such feature is a distinguishing element. i

In respect to such particularcombinaticns,

as will be manifest from what later appears,

the bucket oounterpoise, being always a precise and separateunitary mass of less weight than required for the c ounterweight of the crane, is itself arranged to take the place of a corresponding portion of the last named counterweight, thereby 'advantageously cooperating, in a patentable sense, with the lmachine it im roves. 5

' Similarly, t e arrangement-for directing from the head of the boom by ropes 18 and no the boom hoisting ropes and the load susship. The bargeis the source of supply and the delivering ship is the boat that is to 'be served by the lcrane on the"depot ship. Fig, H is an enlarged fragmentary view of the bucket hoisting and weighing mechanisms indicated in' Fig'. l, and Fig. HI

is a view ofFig. II viewed from the rear,

or, in the directions indicated bythe arrows at line 1, l., y

2, 2 are track-girders mounted upon the deck ofthe depot ship.

3, 3 are T-rails mounted upon track-girders 2, 2 and on which wheels 4, d, of a subframe or truck 5, are adapted to travel.

'Mounted upon the sub-frame 5 and adapted to rotate about the `axis A, A is a superstructure 6 provided with a .boom 7 and a back-stay 8. v

The back-stay 8 is made up of component members 8a, 8", and 8; f v A bridle 9 carrying sheaves 10 is 'fastened to the apex of the back-stay 8.

The boom 7 is pivotally fastened to the superstructure 6 at 7L and carries at its outer end one end of a back-stay rod 1l.`

Sheaves 12, 12 are located at the y inner end of the rod 11.. 1

Mechanism for hoisting and lowering the boom is located at 13 in the cab of the superstructure 6. a A boom hoisting and lowering rope 14 is fastened to the bridle 9 at 9 and extends to the underside of one of the sheaves 12; pass'- ing around the' same it extends to and around the sheave 10, thence forward to and around the other sheave 12, thence to and overv a sheave 15 located at the apex of the back-stay thence downwardly and tothe rear toa drum 16,y for the boom hoisting and lowering mechanism located at 13, to which .mechanism the rope lis secured. Y

A ab bucket 17 is shown as suspended icc ` rope 1&1, and the force and las close proximity as sheave 15, the leads o theg-rab bucket.

22 and 23 are sheaves bottomLblock of the,l grab bucket. l l

24:, 25, 26 and 27 are sheaves in the head of the boom, and 28 and 29 are sheaves in the back stay. f

By thus locating thesheaves 28 and 29 in racticable to the the load hoisting ropes 18 and 19 will be nearly parallel with and adjacent to those of the boom hoistull due to the bucket counterpoise 3%,.for t is reason will serve as an auxilliary force for holding up the boom. ln consequence a smaller size of boom hoisting motor, and a corresponding reduction ot the amount of electrical current, is made possible.

Hoist-ing mechanism 30, located upon th superstructure to the rear of the boom-foot 7E, is provided with rope drums 31 and 32..

llastened to the back-stay member 3b,

near its lower end, are counterweight rests or supports 33, 33 that, at times, support a bucket-Counterweight or oise 34:. 'llo eliminate the tare from the ynamometer'readings, this counterweight should be heavy enough to balance a weight in the nature oi tare, represented b the bucket, and its rope and tackle when owered below the boom to a predetermined distance. rlhe weight of the counterweight 34:, in the arrangement shown, will therefore be one halt such tare.

Avmort-ise 34Ca extending into the counterwei ht 3% from the top surfacaand centrally thereof, accommodate a sheave which is heldin place by the axle 35a. When the bucket counterweight 34 is located vertically below the back-stay 8, as indicated, it will be in position to counterpoise the 'crane itself and, to. such extent, will also serve in placeo special ballast for the pun' pose.

l ln lig. ll the several sheaves and drums are shown with dierent diameters to more i clearly illustratethe diagram.

The rope 13 is fastened at its one end to the rope-drum 31 and extends toand over the sheave '26 at the head of the boom, thence downwardlyto and around'the topblock sheave 20, thence upwardly to. and

over the boom-head sheave 24, thence back wardly to and over the backstay sheave 28,

thence downwardly to and under the counterweight sheave 35. This -rope 13, is'

known as the bucket sustaining rope.

The rope 19, known as the bucket 'closin and opening rope, is fastened at its one en to the drum 32 and extends to and over the boomhead sheave 27, thence vdownwardly to and around the bottom-blocksheave 23,thence 65, upwardly to andl around the top-block sheave retener tom-block sheave 22, thence upwardlyto and over the boomhead sheave 25, thence bach-l wardly to and over the backstay sheave 23, thence downwardly to and under the coun- -terwei ht or edualizing sheave 35.

ln't e drawing the ropes 18 and 19 are shown as one continuous rope extending :from the drums over the system of sheaveswith a bight hanging from the rear of the backstay sheaves 28 and 29 in which the equalizing sheave '35 in the counterweight 34 is hung. Separate or individual bucket ropes may be used instead of a continuous rope.. lf separate ropes are used it will be 'necessary to provide other means for equalizing the rope. il swingletree equalizer would answer the purpose.-

ln a boom-crane rope-and-sheave system of the kind shown and described, the forces produced by the bucket and its load are resisted by the dead-end and live-end anchorages of the ropes. Each anchorage sustainsv hall? olE the tare or haltet the tare and load as the case may be. Since the dead-end. oi the ropes 18 and 19 carry only half of the material load it will, of course, be necessary to so calibrate the dynamometer that it will register twice the amount it actuallyweighs, and since the counterweight 34 is des1gned to carry or equalize only half theweight ci 1 the empty bucket, as explained, and none oi v the material load, an anchorage must loe provided to hold the counterweight to afprede# f termined limit of travel in order to count/er.-

act the torce produced by the weight ol the material loa ln the illustrations, the

reo

ridgebeam RB of the cab on the vsup'er-` l structure is Aused as such an anchorage.v The loor beams, in some cases, convenient anchorage. v

Cross-.beams 36, 36 near the bottom of the back-stay members 8b, 8", carrying a sheave-support 37 whose sheaves38 and 39 stand in a planev that passes through the ridge beam and the axle 355L at right angles to the plane of the sheave 35 in the counter' weight 3d, the sheave 39 having that part of i its score that is diametrically away trom the sheave 33 tangent to the plane that passes through the sheave 35. i

@n the'underside of the counterweight 3ft, and in the plane just referred to, an eyebolt d() is fastened.

might adord a' Directly above the sheave 38 and in with that part of its score that is diametri` cally opposite the sheave 39 a turn-buckle. rod l1 is suspended from the anchorage lill,-

A dynamometer., or other weighing mechanism 4-2, is supported by thejrod ll. A rope. or other flexible connection/i3, is testened at its one end to theeye-bolt l0 and passes down under the sheaves 39 and 33,

then up to the dynamometer where its other end is operatively fastened to the same.

lt ie obvious trom the foregoing desemp- Lezione? 1,

tion that when the bucket is lowered onto a pile of material to gather a load the coun- I ter-weight 34 will descend until it encounters the stops 33, 33 where itv will rest until the bucket is hoisted oil' the pile. As soon as the bucket, with a load, has been hoisted clear of the material and is freely suspended by the ropes 18 and 19, the stops 33, 33 will be relieved of the weight of thercounterweight justed to read zero when the bucket is in a predetermined position with relation to the boom-head, and, if all the readings are.

made when the bucket has. reached approximately that position and is there held or the purpose, the best results will be had. y

A modified form of the dead-end side of the rope system may be had by eliminating the counterweight 34, in which case, the

' rope 43 would have' to be attached to a 'lhe form sheave-case of the sheave 35. first described is the better and more prac# tical one because a smaller capacity dynamometer can be used as the counterweight 34 absorbs the tare load, also'any shock, such as, for instance, the dropping of the bucket and catching it on the lines 18 and 19, would be 'partially absorbed by the counterweight, eliminating undue and excessive strains on the dynamometer. v

rAlthough the connectiom between the counterpoise 34, and the suspended weighing mechanism 42, is shown as flexible, it is not intended to limit the invention, in,V its broader scope, to that form; any othertarrangement that has a certain degree of lost motion, and is not rigid, or integral with the parts joined, will equally involved. y

Having described my said invention and shown and explained a concrete application comprise the idea of the same, what I claim and wish topro#v tect by Letters Patent, is as followsz 1. A means for ,weighing the loads of hoisting and lowering machines'in transit, comprising the combination, on such machines, of a winding drum, a freely disposed counterweight of suitable weight `to balance the tare of the loads sustained, bucket sheaves, a boom, a load-sustaining pulleysystem having the rope-member thereof' i operatively reaved through the bucket sheaves to be sustained andthe head of the boom, with its live endV attached .to said winding drum, and'its dead end con# nected to said counter weight, together with means for limiting the downward travel of lsaid c'ounterwe'ight to a predetermined point, and mechanism, in operativerelation to said counterweight, for measuring the force exerted by the load during any up-u ward' movements of the counterweight from saidl point, substantially as shown and described.

2. In, revolvable cranes, a` means for weighing the loads in transit,l comprising the combination of a winding drum, bucket sheaves, a counterweight of suitable weight to balance the tare ofthe loads sustained,

a boom freely disposed at a predetermined limit of downward' travel with .respect to the same, a load-sustainin pulleysystem having rope-members lea ing from lthe winding drum through the bucket sheaves and sheaves at the head of the boom, back- .wardly to and over sheavesat an elevated 1 point on the superstructure of the crane, and thence downwardly to and into supc porting connection with the' counterweight',

together with suitable mechanism on the crane, in operative relation with the coun-y terweight, for measuring thedynamic torce v of the load during the upward movement of the counterweight from its stated limit and place, substantially as shown and described.

3. In a revolvable cranehaving a verti lcally movable boom and a vpulley system for raising and lowering the same with the rope-member thereof leading over an' elevated sheave on the superstructure of the crane,

the same, .the combination, with a' second downwardly to a winding drum forl windingdrum von the crane, va counterweight freely determined limit of travel with respect to the crane, bucket sheaves, a load-sustaining pulley systemA having rope-members leading from the second drum through the bucket sheaves and sheaves at the head of the boom 'for the purpose, backwardly to and over sheaves 4at a point on the superstructure of the crane in close proximity to said elevated sheave, and thence downwardly to and into supportin connection with said counterweight, t e said counterweight bein ot su'tlicient weight to balance the tare o the loads when freely suspended by said load- -sustaining pulley system, together with' suitable imechanism von the crane, operatively relatedjto the counterweight, for

sposed below said sheave at a preim measurilig the dynamic force of the load sustained duringl the-upward movements of the counterweig t from its stated limit and place, `substantially as shown and described.

4. In vrevolvable cranes, a means. for weighing the loads in transit,I comprising a counterweight against the overturning movementjof the crane,having a separable .portion thereof .that is' freely disposed at and of suitable 1 lao l ,the combination of a'winding drum, 'a.boom,

speeied, e load-sustaining. hnvin a rope-member that leeds m said winding drum through the buelretvsheoves and sheaves at thehead of the boom provided for the purpose, backwardly to and l over sheaves provided for the purpose at an elevated point on the superstructure of the crane, and thence downwardly to and into supporting connections with said sepa--4 roble. portion, together with suiteble mechanism on the crane, inoperative relation to said portion for measuring the dynamic torce of the loads during the upward move- A v ments of the counterwelght se erable porlill tion from its stated limit ,on stantially asshown end describe 5.v ln e moveblecrene having e vertically lace, subv movable boom' ond .o pulley-system for pullegv system o retener respect to the crane, and of a suitable weight to balance the tare of the load. when freely suspended against the same by'the loadsustaining pulley system hereinafter vsperied, winding drums for the ropemembers of said pulley system last above named, a load sustaining pulley system having ropemembers that lead from their winding drums, `through the bucket sheaves, and sheaves ot the head of the boom provided for the purpose, backwardly to and over sheaves provided Jvlor the purpose at a point on the superstructure of the crane, in close proximity to said elevated sheets, and thence downwardly to. and into supporting connection with seid separable portion, vtogether with suitable mechanism on' the crane, in operative relation to seid portion, for measuring the dynamic force of the loads during the upward movements of said counterweight portion from its stated limit and place.

HARRY E. SCUTT, Witnesses:

L. P. Lrrre Wirms L. llVnsroo'r'r,

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