US393439A

US393439A - Dredger-dipper

Info

Publication number: US393439A
Authority: US
Publication date: 1888-11-27
Anticipated expiration: 1905-11-27

Description

UNITED STATES PATENT Orricn.

MANLEY C. LA\VTON, OF STATEN ISLAND, CALIFORNIA.

DREDGER-DIPPER.

SPECIFICATION forming part of Letters Patent No. 393,439, dated November 27, 1888.

Application filed Juno 2, 185 8.

To all whom it may concern.-

Be it known that I, MANLEY O. LAWTON, of Staten Island, San Joaquin county, State of California, have invented an Improvement in Dredger'Dippers; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class ofdredgerdippers in which opposing jaws of the clamshell pattern are pivoted to a carrying-frame and are operated by a sliding cross-head connection and pulleys and chains; andmy in vention consists in the constructions and combinations of devices which I shall hereinafter fully describe and claim.

Referring to the accompanying drawings, Figure l is a side elevation of my dredger-dipper. Fig. 2 is an end elevation of same.

A is the frame of the dipper, consisting of separated parallel sides made Wide near their lower ends.

B B are the jaws, of the usual clam-shell type. They are pivoted in parallel planes by the rods b b at the extremities of the frame A, closing to the center and opening out their full width beyond the sides of the frame. The ordinary clam-shell dipper has its jaws pivoted on a common shaft in the center of the frame, and they can therefore open only to their own Width. The advantage of my present dipper is that opening to such a width it has a greater cut and a freer dump.

Thejaws are operated by the following novel mechanism: To each side of each jaw, as shown at the points 0, are connected the links 0, the other ends of which are attached to a crosshead, D, which is mounted and adapted to move up and down in the slotted center bars, a, of the frame A. Mounted in the head of the frame is a rotary shaft, E, having upon its center and rigidly keyed to it a large chainpulley, F, to which the main hoistingchainf is attached. Fixed upon the shaft E beside the main pulley F, or forming part of said pulley, if desirable, is a smaller chain-pulley, G, to which a chain, 9, is attached, but arranged to wind in an opposite direction to that in which the chainf winds on its pulley. These two chains may be supposed to lead to the usual hoisting mechanism of the dredger, and which need not herein be described. Upon shaft E, near each side and just within the Serial No.275,808. (No model.)

frame-sides, are rigidly fixed the chain-pulleys H, having a diameter equal to that of the pulley G. To these pulleys H are attached the chains h, which extend downwardly and are connected with the cross head D of the jawlinks 0. -Upon the shaft E and alongside of the pulley F are fixed two chain-pulleys, I, from which chains J pass down to and are connected with arms K, extending from the back of the jaws. These chains wind upon their pulleys in a direction opposite to that in which the chains h wind on their pulleys H.

The operation is as follows: Supposing the jaws open, the chainf is hauled in, thereby rotating the shaft E. This winds up chain 9 on pulley G. It also winds up chains h on pulleys H, and these chains being con nected with cross-head D pull it up, and through the links 0 the jaws are brought together and closed. In this movement the chains J pay out. The leverage of the links is sufficient to exert the required power to close the widely-separated jaws and take the load. To dump theload,the chainfis slacked np,thus throwing the weight on chain g,which,

through pulley G, turns shaft E back again,

thus paying out on chains h and allowing the cross-head to move down under the weight of the load, separating the jaws. The chains J now act, for by the rotation of pulleys I with shaft Esaid chains are wound up, and pulling up on arms K complete the opening of the jaws, spreading them to their greatest extent or range.

I am aware of dippers having a number of approximately spherical sectors hung from a ring above or having their pivotal centers arranged otherwise in a circle; but these dippers belong to a different class and their jaws are not pivoted in parallel planes.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a dredger dipper, and in combination with the carrying-frame, the opposing jaws B B, pivoted in parallel planes in the extremities of the frame, widthwise the links attached to the jaws, the movable cross-head mounted in the frame and connecting the links, the rotary shaft in the frame carrying the main pulley,with chain attached, a second pulley with oppositely-attached chain, and the side pulleys, with chains connecting them with the movable cross-head, substantially as herein described.

2. In adredger-dipper, a carrying-frame and opposingjaws pivoted thereto, in combination with the links attached to the jaws, the m0vable crosshead connecting the links, the rotary shaft having a main pulley with connected chain, a pulley with oppositely connected chain, the side pulleys with chains to the crosshead for lifting it, and the pulleys Lwith chains to the jaws for opening them, substantially as herein described.

3. In a dredgerdipper, a carryingframe and opposing jaws pivoted to said frame, said jaws having arms projecting from their backs, in combination with the links attached to the jaws, the movable cross-head connecting the links, the rotary shaft having a main pulley with connected chain, a second pulley with oppositelyconnected chain, side pulleys with chains to the cross-head for lifting it, and pulleys I, with chains J attached to them and to the arms of the jaws for opening said jaws, substantially as herein described.

4. In a dredger-dipper, a frame having separated slotted sides and the opposing jaws B B, pivoted in parallel planes in the extremities of the frame-sides, said jaws having arms projecting from the backs, in combination with the links attached to the jaws, the movable crosshead connecting the links and mounted in the slotted sides of the frame, the rotary shaft having a main pulley with connected chain, a second pulley with oppositelyc011- nected chain, side pulleys with chains to the cross-head for lifting it, and pulleys I, with chains J, connected with them and with the arms of the jaws for opening said jaws, sub stantially as herein described.

In witness whereof I have hereunto set my hand.

MANLEY C. LAWTON.

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