US381258A - Manlet c - Google Patents

Description

(No Model.)

M. G. LAWTON.

DREDGER DIPPER.

Patented Apr. 17', 1888. 8

N, PETERS, Pholc-hlhugnphgr, Washington, D. c

UNITED STATES PATENT om-ca: I

MANLEY o. 'VLAWTON, OF STATEN; ISLAND, CALIFORNIA.

.DREDGER-DVIPPEFVL SPECIFICATION forming tarts; Letters Patent as. 381,258, dated Aprill'l, 188a. v j I i Application filed February 8, 1888. Serial No. 263,421. (Ho model.) I

To all whom it may concern:

Be it'known that I, MANLEY C. LAWTON, of Staten Island,j.San Joaquin county, State of Oallfornia, have invented an Improvement in Dredger-Dippers; and I hereby declare the followingto be a full, clear, and exact description of the same. I p My invention relates to that class of dredger dippers or buckets whichare commonly known as clam-shell, and which employ two. opposing pivoted jaws, with mechanism forrforcing them together and releasing them.

My invention'consists, in connection with the jaws, of thecrossing links, the sliding cross-heads, and a sliding or varying connection between the links andthecross-heads, as I shall hereinafter fully describe.

The object of my invention is -to increase the power in closing the jaws and to apply this increase in the best manner.

Referring to the accompanying drawings, Figure 1 is an elevation of my dipper. Fig. 2 is a side elevation.

V I A represents slotted guide frames of the dipz 5 per,'toa bracket, a, on the lower end of which .arepivoted,atb,theopposingjawsB. Mounted in the lower part of the frame is a rotary shaft, 0, on the center of which is a sheave, D, and) on each side of which are sheaves E, of smaller sheave, and two chains, 6, are secured to'each of the smaller sheaves,the chains on the smaller sheave being wound in a direction opposite to the chain on the larger sheave. Mounted in the slotted guides and adapted to move up and down therein are the blocks 6', which carry the cross-shaft 0, having a bail or yoke-frame,

e with lifting-chain e; attached. Secured to the cross-shaft on each side is across-head, G, each of which is longitudinally slotted.

Secured to the frame A on each side are the guide-brackets H, which are provided with slots h, said slots at their outer ends'being diameter. A chain, d, is secured to the larger.

these pinsor studsf, and the end-of theuother chain on the sameside is attached to the other I pin or'stud, the two chainsic on the otherside being similarlyattached. v

The operation is'as follows: When the bucket has been lowered down in an open position to the bed of material in which itis to operate, the chain d is drawn up, soas to rotate-the 6e sheave D, and through said sheave'and the shaft 0 to rotate the sheaves E, wherebyrthey wind up their chains 6, thus pulling down upon:

the links E. This causes said links to move downwardly, their pins or studs f moving downwardlyin the slots of the brackets H and inwardly in the slots of the sliding cross-heads G until" they reach their limit, when the jaws are closed. To open the dipper again, when I .hoisted by chainkz, the-chain d is slacked up,

so that the jaws are relieved. By this construction I gain a greater power of closing the jaws, due to the increased leverage of the lin ks.

This leverage is the greatest when the connection of the'link and cross-head is at the outer.

limits, and on account of the vertical portion of the slots h the greatest leverage is maintainedfor a short time at the beginning of the operation, sothat the jaws'are-enabledto dig into the material withsufficient power.

A further advantage inpower is gained by the sliding or varying connection betweenthe link and crossheads, as I am'enabled by-the' connection of the chains e toexert their in the line of resistance. v 7

Another advantage ofthe sliding connection between the links and the cross-heads is that power said links may be shorter than they would.

have tobe if they wereattached permanently at the outer ends of 'thecrossheads. i gq Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is;-

' 1.v In a vdredger-dippenthe pivoted oppos ing jaws, in combination with the crossing links attached to said jaws, thesliding crossheads, and a sliding orvarying connection be-- tween said cross-heads and the upper endsof the links, substantiallyas herein described.

2. In a dredger-dipper, the pivoted oppos ing jaws, in combination with the 'crossing' fl links attached to said jaws, the sliding longitudinally-slotted cross-heads, and pins or studs I by which the upperends ofthe links are con- I nected with and slide in the slotted crossheads, substantially as herein described.

3. In a dredger-dipper, the pivoted opposing 'jaws, in combination with the crossing links attached to said jaws, the sliding longitudinally-slotted cross-heads, the fixed slotted guide-brackets, and pins or studs in the upper ends of the links and passing through the slots in the guide-brackets and in the cross-heads, substantially as herein described.

4. In a dredger-dipper, the pivoted opposing jaws, in combination with the crossing links attached to said jaws, the sliding longitudinally-slotted cross-heads, the fixed guidebrackets having slots with approximately vertical outer endsand thence curving inwardly, and pins or studs in the upper ends of the links and passing through the slots in the guide-brackets and in the cross-heads, substantially as herein described.

5. In a dredger-dipper, the pivoted opposing jaws, the sliding cross-shaft with its liftingchain, the rotary shaft having the large sheave with chain (1, and the smaller sheaves with chains e, in combination with the crossing links attached to the jaws,'the sliding slotted cross-heads carried by the cross shaft, and the pins or studs in the tops of the links, and with which the chains e are connected, said pins or studs passing through the slotted cross-heads, substantially as herein described.

6. In a dredger-dipper, the combination of the pivoted opposing jaws, the sliding crossshaft with its lifting-chain, the crossing links by which the jaws are operated, the sliding slotted cross-heads carried by the cross-shaft,

MANL'EY c. LAWTON.

Witnesses:

S. H. NoURsE, H. .0. LEE.

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