USRE7348E - Improvement in hydraulic lifts - Google Patents

Description

J. CANAN.

Assgnol' one-half interest to J. BUR ROWS. W. 85 A. CHATFIELD.

HYDRAULIC-LIFTS.

No. 7,348. R'eissued Oct. 10,1876.

WITNESSES: mvzmm I M A f vi MW; momlm UNITED 1 STATES PATENT OF ICE JAMES oANAN, 0F PORT ooLBonnn, on'rARro, oANADA, ASSIGNOR OF ONE-HALFINTEREST TO JOHN BURR'oW, WALTER CHATFIELD, m)

ALBERT CHATFIELD.

IMPROVEMENT m HYDRAULIC um;

Specification forming part of Letters Patent No. 177,372 dated May 16, 1876; reissue No. 734g, October 10, 1876; application filed September 21, 1876.

v To all whom it may concern:

Be it known that I, JAMES CANAN, of Port I Qolborne,-in the county of Welland, Ontario,

Canada, have invented a new and useful Improvement in Hydraulic Lifting Apparatus; and 1 do hereby declare that the. following is a full, clear, and exact description of the same.

My invention, relates to an improved mechanism for raising spuds or anchors of spoon and other dredges by hydraulic power.

In practice, it is common to provide dredges with three or more such spuds or anchors, for the purpose of holding them stationary while the spoon or other form of the elevator is be-- ing. operated.

The spuds or anchors are arranged to work in vertical guides, and usually arranged one at the stern and one at each side of the dredge.' A cylinder containing aplunger is placedcontiguous to each spud or anchor, the several cylinders being connected with a pump, so

constructed that the water may be forced into all the cylinders simultaneously or into but one of them, as required. The plunger of each cylinder is connected to its adjacent spud by means of aclamp, which is so constructed as to gripe or bite the spud when upwardpressfor raising a sterii spud or anchor. Fig. 2 is an end view. Fig. 3 is a detail view, showing, with more particularity, the application of the clamp to'a spud or anchor. A

Y A is the frame of the dredge; B, a spud or anchor; 0,-the clamp; D, the cylinder; E, the pipe, to which the pipes (not shown) leading to the pump are to be connected. These pipes should be ,providedwith suitable stop-cocks, so that the water can be admitted into all of the cylinders at the same time or not, as may be desired. F is a plunger-rod, which fits into the cylinder D, as shown. The plunger requires to be connected. with the clamp by suitable means, In this instance I show-an arm, G, for that purpose. The clamp consists of a strap, H, loosely encircling the spud or anch01, so that it, will slide freely downward thereon. It is caused to gripe or bite the spud by the outward movement of the plunger, whichiu turn applies upward pressure thereto. The clamp is rendered most cifective, and caused to bite more readily,l)y proriding the arm G with an upwardly -projecting toe, as shown. The spud is held elevated by an cecentric, J, operated by a lever; but its upward movement is not impeded by it.

The operation is as follows: Having constructed and placed in position the cylinder D with the attachments, as described, I attach hydraulic-,pipilig, to the pipe E, connecting the said piping to aconveniently-located pump, by which water is forced through the piping referred to' into the cylinder, thereby forcing out the plunger-rod F, and, owing tothe connection between each rod and its respectiveanchor, '21. corresponding motion is conveyed to the latter. I Y

As it would not be desirable to make the cylinder sufliciently long to enable the anchors to be withdrawn in'oue stroke of the plnngers, each'cylinder is provided with a draw-off valve, M, through which, .when the supply from the pump is stopped, the water in the cylinder is withdrawn, and the plunger-rod, by its own weight, descends to the bottom of the cylinder', and the strap or clamp H also descends simultaneously, so that the operation can be repeated.

The descent of the anchor is arrested by the actionof the eccentric rollers J as before described. Consequently the plunger-rods return alone, and when the pressure is put on again the connection with the clamp and the anchor'is once more eflectod, and the anchors carried still further: up and so 'ontill theam chors have been raised tothc height desired. V

Instead of water, compressed air, steam, or other similar power might be utilized for the" purpose of raising the plunger. What I claim as my invention is- 1 The combination of the cylinder connected with a force-pump, and provided with a plun H ger, F, a clamp, H, and .spud'or anchor, substantiallyas shown and described, whereby the clamp is caused to'gripe the spud as the plunger is forced out "and to slide doyrnon;

scribed.

the samewhen the plunger-recedes, as. specifled-v. p I

2. The combination, with .the spnd or anchor, of the cylinder and plunger, the sarne being suitably connected and arranged to operate substantially as herein shorm and de- JAM S N Witnesses:

j GEORGE McEnwmn,

G, BROWN.

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