US997748A - Grab-bucket. - Google Patents

Description

O. W. GALLAHAN.

GRAB BUCKET. APJPLIOATION FILED SEPT. 13, 1907. RENEWED MAB. 6, 1911.

99?,748, Patented July 11, 911.

.2 SHEETS-SHEET 1.

WITNESSES.-

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ATTORNEY O. W. CALLAHAN.

GRAB BUCKET.

E dd M/VE/VTUI? @MMMMM ATTORNEY WITNESSES:

UNITED STATES 'PATEN T OFFICE.

OWEN w. ,G'ALLAHAN', or CLEVELAND, OHIO, assrenon TO THE ownn BUCKET COMPANY, A CORPORATION or OHIO.

GRAB-BUCKET.

Specification of Letters Patent.

Patented July 11, 1911.

Application filed. September 13, 1907, Serial No. 392,818. Renewed March 6, 1911. Serial No.612,716.

To all whom 'it' may concern;

Be it known that I, OWEN W. OALLAHAN,

a citizen of the United States, residing at Cleveland, in the, county of Cuyahoga and State of Ohio, have invented certain .new

and useful Improvements in'Grab-Buckets,

and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in'the art to which it pertains to make and use the same.

. This invention relates to grab buckets and especially to grab buckets of the clam shell type operated on the block and falls or tackle principle. Y

. One of the objects of the invention is to provide a grab bucket which has great digging power and is strong and durable.

A further object is to provide a bucket which is operated on the'block and tackleprinciple and has upper and lower closing blocks each provided wit of sheaves, the blocks bei g arranged and a multiplicityconnected in a manner such that all the different bights or sections of the closlng cable reeved about such sheaves have fair" leads,

and the sections extending upwardly from the .outer or end sheaves of'the lower closing block are in substantially the center [plane of the bucket, so that the bucketwill be plumb-at all times when suspended by th closing cable.

A still further object is to provide simple but effective means whereby the bucket may be suspended and carried independently of the closing cable so that the latter may be relieved of the load' after the bucket is closed.

These'and other objects are accomplishedby my invention which maybe briefly summarized as consisting in certain novel details of'construc'tionand combinations andarrangements of parts which will be described in the specification'and set forth in the appended claims.

In the drawings, Figure '1 is a vertical sectional view withparts in elevation, of a bucket constructed in accordance with my invention; Fig. 21s aside elevation of the bucket showing more clearly therarrangement of the upper and lower closing blocks with respect to'each other and with respect to the parts to which said blocks are respectively connected.

The bucket is. provided with two jaws 1-1 which are pivotally connected through the medium of a shaft 2, and hinging arms 3, which are fastened to the inner or adja-- Great digging power is obtained with the present bucket by reason of the fact that I employ a counterweight which is indirectly connected to thejaws, and a closing tackle including a lower closing block 5 and an upper closing block 16, each having a multiplicity of sheaves, the digging power being dependent uponthe weight of the counter-v weight, and also the number of sheaves of the closing tackle. By employing these parts, when the bucket isbeing closed on the material, the upper closing tackle is pulled downward, instead of the lower block being -pulled upward toward the upper block. In this case, the upper block 16 is suspended from the rod 15, and the lower block 5 is connected directly to the counterweight 4. In employing a considerable number of sheaves in the closing tackle, as in the present case in which the lower block has four sheaves and the upper block three sheaves, the bights of the closing cable 23 which is reeved about the sheaves, would ordinarily be inclined and. would not have fair leads, and the portions of the cable extending up-, wardly from the two outer or end sheaves of the lower block would be on'opposite sides of the center plane of the buoket,-withthe result that the bucket would not hangplumb. To overcome these disadvantages, the lower block 5 is inclined with respect to the counterweight and is arranged at an angle such that the portions of the ,cable 23 extending upwardly from the two outer sheaves and up through the guides carried by the bucket head have fair leads and are in substantially This ar- 1 the. center plane of the bucket. rangement will be apparent from a comparison of Figs. 1 and 2. Furthermore, the'upper block is given a slightly greater inclina-' tion than the lower block, as indicated in Fig. 2 so as to cause the sh'eaves of the upa series of lugs at the top of the counterweight and arranged in a row at the proper inclination to accomplish the results above stated. The cheek plates and division plates which are arranged between the sheaves 6 in the usual manner extend downward into slots bet-ween'the lugs of'the counterweight, as shown in Fig. 2.

In order that the closing tackle may be .relieved of the load of the bucket and of the material in the bucket after the bucket jaws are closed, I have \provided the following simple and very eliective supporting mechanism for supporting the bucket with the jaws in closed "position. To support the bucket and its load independently of the closing tackle, I provide bail 9 which is loosely connected to the rod 15 in a manner such that there may be slight play between the two, the bail 9 having .at its ends which extend beneath the rod 15, suitable hooks 10. On the counterweight are pivotally'connected a pair of'bell crank levers having arms 11 which are adapted to engage the hooks 10, these bell crank levers being pivoted to the counterwei htvat 1212 on opposite sides of the lower closing block 5. The bell cranks are also provided with outwardly extending arms 13 which when the counterweight is raised during the closing movements of the jaws, are adapted to be engaged by spring-like members 18, on the lower ends of'depending arms 14: mounted on therod lf), so as to rock the bell cranks and swing the arms 11 in position to be engaged by the hooks 10 on the bail 9. Springs 19 attached to the bell cranks are adapted to bear on the top of the counterweight 4 and rock the bell cranks so as to swing the arms 11 out of reach of the hooks 10 when the counterweight 4 is low-- ered slightly and when the arms 13 move awaj from the members 18. The arms 14 and downwardly projecting ends of bail 9 are held in proper relative positions by guides 17 secured to the arms 14 and projecting on opposite sides of the bail. \Vith this construction, when the jaws are closed, the bell cranks are automatically swung to positions such that the arms 11 may be engaged by the hooks 10 when the bail 9 is pulled upwardly, but when the bucket is supported independently of the bail, as when it is desired to open the buckets, and as soon-as the counterweight moves downward slightly, the bell cranks automatically swing to positions such that the hooks of the opening the bail will not interfere with of the bucket jaws.

\Vhat- I claim is g 1. In agrab bucket, a pair of jaws pivotally connected together',a bucket head,

armsconnecting thehead to the outer poi tions of the jaws, means for giving the bucketdigging power comprising a counterweightat'the pivotal axis of the jaws, and

a closing tackle adapted to receive a closing per block connected to the head and a multiple 1 sheave low-er block connected to the counterweight, the bottom portion of the lower block being connected tothe top portion of the counterweight, and the sheaves of the lower block being inclined to the axis of the counterweightat an angle such that the off-running portion'of the cable extend cable and including a multiple sheave upi ing upwardly from one of the end sheaves of the lower block is in substantially the center plane of the bucket.

2. In a grab bucket, a pairof jaws pivot ally connected together, a bucket head, arms connecting the head to the outer portions of the jaws, a counterweight at the pivotal axis 7 of the jaws, and'a closing tackle adapted to receive a closing cable and including a. multiple sheave upper block connected to the head, and a multiple sheave lower block con-- nected to the counterweight,ftlie blocks be- 1 ing relatively skewed so as to'cause the portions of the cable between the two, blocks to have fair leads, and the bottom of the lower block and the top of the counterweight having overlapping portions provided with alined openings adapted to receive a connecting pin arranged at such an angle to the axis of the counterweight that the oil running portion of .the' cable extending upwardly from one of the end sheaves of the lower block is insubStantially the center plane of the bucket. I

3. In a grab bucket, a pair of jaws pivotally connected together, a bucket head, arms connecting the head to the outer portions of the jaws, means for giving the bucket pin extending through the lugs and portions of the block which overlap them and arranged at an angle such that the ofi' running portion ofthe cableextends upwardly from one of the end sheaves of the lower block at substantially the center plane of the bucket.

4. A bucket of the type set forth, comprising two jaws pivoted at the upper central portion to a counter-weight, a block and fall arrangement connected to said counter-weight for the purpose of closing the jaws andallowing the same to open with means such as catches connected to the counter-weight for engaging a vertically movable. bail whereby the jaw are locked in closed position in.co1nb1nation with said bail.

5. A grab bucket comprising two jaws, a counter-weight, and said jaws pivoted at their upper portions thereto, a block and fall arrangement positioned diagonal-1y with respect to said coiuiter-weight and connected thereto, a cross-bar positioned in parallel relation to said counter-weightand above the counter-weight, and the block and fall arrangement connected thereto, pivotal links connecting the middle outer portions of said. buckets to said cross-bar, a vertically movable bail pivoted to said cross-bar and provided with hooked lower ends, springpressed rocker means pivoted to said Colin ter-weight and adapted to engage said hooks for locking said jaws in closed position.

6. A grab bucket comprising two jaws, a counter-weight, and said jaws pivoted at their upper portions thereto, a blockand fall arrangement positioned diagonally with respect'to said counter-weight and connected thereto, a cross-bar positioned in parallel relation to said counterrweight and above the counter-weight, and the block. and fall ary rangernent connected thereto, pivotal links connecting the middle outer portions of said buckets to said cross-bar, depending hooks pivoted to said cross-bar, rocker means car'- ried by said counter-weight and adapted to engage said hooks,- anddepending members secured to said cross-bar for automatically positioning said rocker means in engagement with said hooks,

Signed at Cleveland in the county of Cuyahoga and State of Ohio, this 3rd, day

ofS'e'ptember, 1907.

OWVEN W. CALLAHAN.

Witnesses E. B. DONNELLY, W. F. DONNELLY,

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