US378099A

US378099A - lawlee

Info

Publication number: US378099A
Authority: US
Publication date: 1888-02-21
Anticipated expiration: 1905-02-21

Description

of a pump. To the top of said piston B are at- 4c -panying drawings, in Which- 'UNITED STATES VPATENT OFFICE.; 4

THOMAS LAWLER AND JOHN J. LAWLER, OF. CLIFTON, NEW YORK.

EXCAVATING-BUCKET.

SPECIFICATION forming part of LettersPatent No. 378,099, dated February 21, 1888.

Application filed March 12,' 1887.

Serial No. 230,712. (No model.)

To all whom it may concern:

Beit known that we, THOMAS' LAWLER and J OHNJ LAWLER, citizens of the United States, and residents of Clifton, in the county of Bichmond and State of New York, have invented certain new and useful Improvements in EX- cavatingBuckets, of which the following is a specification.

Our invention relates to that class of dredge excavating-buckets known as clamshell or grapple buckets. The special object of our bucket is to operate in hard or compact material, such as sand or clay, where the present' class of such buckets will not operate, owing to the inability to force or hold the buckets into the material. This we accomplish by bringing the grappling parts of the bucket onto a cylinder having the operating parts mounted thereon, and the said cylinder provided with a piston working within the cylinder, which raises the material in its upward movement, and by the vacuum thus formed the cylinder is held down on the material, so we are enabled to force the grapple-scoops into the material, which close under the bottom and retain the load while being raised from the bottom, which will be hereinafter more fully explained, reference being had to the accom- Figure 1 represents side elevation of our bucket as closed when loaded, part in section. Fig. 2 represents same when open for dis-j charging the load and ready to lower on the material for another load.

A is the cylinder in which the piston B is fitted, same being provided with a packing, 2, of any suitable material, to make said'pis ton air-tight in similar manner as the piston tached the toothed racks C 'and C', respectively, on the upper end of which is secured the cross-head guide D, through which the operating-chains pass, being guided by suitable rolls, 3 4 5 6. Engaging with the racks O and O are the gear wheels E and E', mounted on suitable arms, 7 and 8, secured to the outside ofcylinder A at b, the said wheels E and E being connected tothe pivoted grapplescoops F and F by the rods 10 and 11, hinged to the outeredgel of same at C. The said scoops are secured to the outside of the cylinder A at 12 on pivots or trunnions.

G and G are the hauling-chains for closing the grapple-'scoops F and F and raising lthe load.

H and H are backingchains for opening same when raised to point of discharge and for lowering said bucket onto the material, as shown in Fig. 2.

The operation is: The bucket being open, as

shown in Fig. 2, the said bucket is lowered by the chains H and H onto the material. The edge of the cylinder A will force itself vinto same until it rests on the piston B. The cutting-edges 13 and 14 of the scoop-grapples will also enter to the same depth. lThe chains H and H are then slackenedl and the power applied to the chains G and G,which are secured to the wheels E and E', respectively, and pass under sheaves 15 and 16, (secured on the top of piston B,) thence up between the racks O and C', through the cross-head D, to the point of power. As the said chains G and G are drawn up, they raise the piston B in the cylinder A, drawing the material into same, and at the same time force the pivoted grapple-scoops F and F into the material, as shown by dotted lines in Fig. 2, by the rods 1() and 11, which are actuated by the wheels Eand E', the said wheels being revolved by engagement with the toothed racks O and Cand the chains G and G', this motion continuing until the scoops'are closed and the piston B is at the top of the cylinder A, as shown in Fig. 1, I

where it will be found that the cylinder A and scoops F and F arefull. The whole being raised to point of discharge, the chains G and G are slackened and the power applied to the chains-H and H', (which are also secured to the wheels E and E', respectively,) revolving the said wheels E and E in the opposite direction, opening the scoops F and F and forcing the piston B downward, as shown in Fig. 2, removing the .load if it should have any tendency to adhere to theA cylinder A, when the bucket is then ready to repeat the abovedescribed operation.

Vhen the bucket is open, as shown in Fig. Y

2, the pivoted grapple-scoops F and F are outwardly inclined at the bottom for the purpose of allowing the material to be discharged from them freely'and to form a better cutting-edge when lowered onto thematerial. Thus it will be seen by the powerful com- IOC pounding of the power by meansof the toothed racks C and Cengaging with the Wheels E und E, to which the hauling-chains G and G are also attached, we are able in hard and cornpact material, which will not rise in the cylinder A, to hold said cylinder firmly down to the Work by the suction of the piston'B, While the grapple-scoops F and F are forced into the material and disengage sufficient quantity to iill the'whole bucket.

If desired, the lower edge, e, of the cylinder A may be serrated, and also the cutting-edge of the scoops F and F', to enable the same to more readily enter the material.

Having described our invention, what we claim, and desire to secure by LettersPatent, 1s

l. In an excavatingbueket, the cylindrical tube A, open at both ends and provided withy the piston B, Working freely in the said cylinder A, in combination with the grapple-scoops F and F', pivoted to the said cylinder A and closing under saine, substantially as and for the purpose specified.

2. In an excavator-bucket, the cylinder A, having a piston, B, provided with toothed racks C and C', and said racks engaging with the wheels E and E', connected at their upper end with cross-head D, substantially as and for the purpose specified.

3. In an excavator-bucket, the wheels E and E', mounted on the cylinder A and engaging with toothed racks C and C', and having the hauling-chains G and G and backing-chains H and H attached to said wheels, and the Wheels being connected to the scoops F and F by the rods 10 and l1, substantially as and for the purpose specified.

4. In an excavator bucket, the haulingchains G and G, passing under the sheaves 15 and 16, secured to the top of piston B, and the said chains connected to the Wheels E and E', mounted on the cylinder A, substantially as and for the purpose speciiied.

Signed at New York, in the county of New York and State ot' New York, thisV 8th day of March, A. D. 1887.

THOS. LAW'LEH. JOI-IN J.. LAVLER. Witnesses:

' C. A. RIcIARDs,

S. S. BARBIE.