US 650691 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
No. 650,69l. Patented May 29, I900. W. RAILTON, B. CAMPBELL &. S. G; RAILTON.
ASH OR OTHER HOIST.
(Application filed Dec. 28, 1898.) (No Model.) 2 Sheets-Shoat l.
H 3 Mm glfjasses J j wfirs:
Tug mums vzrzns ca, mom-urn, WASHXNGTON. b,
No. 650,i69l. Patented may 29, i900.
w. RAILTUN, n. CAMPBELL & .s. a. RAILTON.
ASH OR OTHER HOIST.
(Application filed Dec. 28,..1898.) (No Model.) 2 Sheets-Sheet 2.
wnNEssEs: INVENTDHS' W//7z %7/zfl,
( Z4 fi'cymmt Gm JZ67/ x aim c7 135171317,
v wa/b c .Wamw
cams PETERS co, wa'ro-umon wnumcrom u. c
WILLIAM RAIL'ION, RICHARD CAMPBELL, AND SAMUEL e. RAILTON, or
NITEI) STATES PATENT -FFICE.
ASH OR OTHER HOIST.
SFECIFI GATTON forming part of Letters Patent No. 650,691, dated May 29, 1906.
Application filed December 28 1898. Serial No. 700,586. (No model.)
To ctZZ whom it may concern:
Be it known that we, WILLIAM RAILToN, RICHARD CAMPBELL, and SAMUEL GEORGE RAILTON, subjects of the Queen of Great Britain, residing at Liverpool, in the county of Lancaster, England, have invented certain new and useful Improvements in Ash or other Hoists, of which the followingis aspeci fication.
This invention relates to ash and other hoists, and is designed more especially for use as an ash or coal hoist for steamers. present these are usually worked with gearing, the sudden strains that come upon the toothed gearing causing the fracture of the teeth, and also the noise of this toothed gearing is very troublesome, especially on passenger-steamers. Now by our invention we make a comparativelynoiseless hoist free from these sudden strains.
The invention will be understood from the following description, reference being had to the accompanying drawings, in which Figure 1 is a front elevation of our invention applied as an ash-hoist; Fig. 2, a side elevation thereof. Fig. 3 is a detail View of the steam-valve H, and Fig. 4 a detail view of the cushion-valve.
In place of the usual gearing we employ a pair of pulley-blocks A and B, one above the other, in which several sheaves are arranged to run on the same pin-bearing in each block, and for motive power a steam and water cylinder O. The running pulley-block A is attached to the piston-rod D of the cylinder 0, While the standing pulley-block B is fixed stationarily to a bulkhead or any other suitable object. The rope is secured at one end to a fixed point and passing over each sheave alternately finally goes from the upper block B, over the guide-pulley F, to the bucket. By having six sheaves in each block, as shown in the drawings, the speed can be increased twelve times--that is to say, the bucket is raised twelve times the stroke of the piston at each movement of the latter. The number of sheaves can, however, be increased or decreased, as desired, accordingto the distance the bucket is required to travel.
G represents guide-rods firmly secured at one end to the top of the cylinder and at the Atv other to the block in which the sheaves B are mounted. The pulley-block A at the end of piston-rodD slides on these guide-rods G, and thus secures a steady up-and-down motion. Steam is letinto the cylinder on the upper side only of the piston through the steam-valve H. The lower side is connected with a head of water in the tank I by means of a pipe J. K is a cushion-valve which throttles the passage of the water through the hole 70. When, there fore, steam is let into the cylinder on the upper side of the piston, the water below being throttled by the cushion-valve K only gradually leaves the cylinder G, and consequently the sudden pressure of the gush of steam,
which is so prejudicial to the ordinary geared hoists, is done away with, and the bucket L rises at a uniform speed proportionate to that at which the water can escape from the cylinder O and rises to its head in the tank I, one object of the cushion-valve being to throttle the Water and prevent any sudden rise of the bucket, thus insuring that it shall ascend at a determined speed. To lower the bucket, all that is necessary is to close the steam-valve, thus opening the exhaust. The bucket will then descend by its own weight, assisted by the head of water in the tank, the Valve K opening to its full extent, so as not to cause any throttle. The valve M can be regulated by hand so that it will adjust to a nicety the exhaust-,- and consequently the speed of descent of bucket L with load, the throttling of the exhaust-steam acting as a cushion to the piston in its return stroke, so as to secure the descent at any-speed required. The amount of steam required to operate the piston is small.
-Referring to the valve with which the motive-power cylinder 0 is provided, this Valve consists of a slide or long D-valve P, fitted to slide over ports in the steam-chest Q and worked by the hand-lever N, connected to the spindle N. This D-valve controls two ports, one, B, leading to the steam-cylinder O for the supply of live steam, and the other port, S, leading direct to the throttle-valve M. In operating the hoist, therefore, all that is necessary is to move the handle N, so as to open the live-steam port R and let steam into the cylinder on the upper side of the piston to Ice raise the load. To lower the hoist, all that is necessary is to move the hand-lever N in the opposite direction, thus closing the steamport R and opening the exhaust-port S,which leads to the throttle-valve M. The steam being throttled by this valve only gradully leaves the cylinder, and consequently the load descends at a uniform speed proportionate to that at which the steam can escape from the cylinder. The throttle -valve M, however, can be regulated by hand so that it will adjust to a nicety the speed of descent of the load.
Ve declare that what we claim is 1. In a hoisting apparatus, the combination of a cylinder; means for admitting and exhausting fluid under pressure above the piston thereof; a series of sheaves carried by the end of the piston-rod; a second series of sheaves carried by a fixed abutment in line with the piston-rod; a hoisting-cable passing about said sheaves substantially as described; an elevated water-accumulator; connections intermediate said accumulator and the lower end of the cylinder; and a check-Valve located in said connections and adapted to per mit a free inflow of the water to the cylinder but to check its outflow, substantially as described.
2. In a hoisting apparatus, the eombination of a cylinder; a slide-valve P communicating with the upper end thereof, and with a steam supply and exhaust port, substantially as described; a series of pulley-sheaves carried by the upper end of the piston-rod a second series of sheaves carried by a fixed abutment in line with said piston-rod; a cable passing about said sheaves; an elevated water-accumulator; connections intermediate said accummulator and the lower end of the cylinder; and a check-valve K located in said connections serving to permit a free inflow of water to the cylinder but to check its outflow, whereby the piston may have a quick upward movement'but can only have a relatively-slow downward movement, substantially as described.
3. In a hoisting apparatus, the combination of a cylinder; a steam-valve connected to the upper end thereof above the piston, said valve being in communication with a steam supply and an exhaust passage; alever for controlling said steam-valve; a throttlevalve for the exhaust-passage; a water-accummulator; connections intermediate said accumulator and the lower end of the cylinder; and a check-valve located in said connections intermediate the cylinder and the accummulator, substantially as and for the purpose described.
In witness whereof we have hereunto signed our names, this 8th day of December, 1898, in the presence of two subscribing witnesses.
\V. RAILTON. It. CAMPBELL. G. RAILTON. Witnesses:
G. S. DYMOND, V. H. BEEsToN.