US 235565 A
Description (OCR text may contain errors)
(N M d1.) c
o er c G. A. PAascNsaW-.icacss Apparatus for Communicating Fluid Pressure tc Work' Movable Hydraulic Machines.
No.2s5,565'.i Patented De.14,1ssc.
N. PETERS. PHDTO-LITHOGRAPNER. WASUNGTON. D C,. l
TiilNTTnn STATES PATENT Tricia CHARLES A. PARSONS AND WILLIAM CROSS,J OF NEWCASTLE-UPON-TYNE,
' COUNTY OF N ORTHUMBERLAND,` ENGLAND.
A APPARATUS FOR COMMUNICATING FLUID-PRESSURE TO WORK IVIOVABLE HYDRAULIC MACHINES.
SPECIFICATION forming part of Letters Patent No. 235,565, dated December 14, 1880.
Application led'Novemher16,1E80. (No model.) PatentedinEnglandFebrual-y,1880.
jointly obtained Letters Patent in Great Britain, No. 84:6, bearing date February 26, 1880,) of which the following is a specification.
` Machines worked by hydraulic pressure, such as hydraulic cranes, Winches, riveters,
`and other tools, are frequently mounted on truck-wheels, so that they can be moved for some distance along rails, as by the side of a quay or on a traveler, and it is necessary to provide in such cases tlexible or jointed pipes for communicating the Huid-pressure that has to work them in the diterent positionsA to which they are moved. Such flexible or jointed pipes are, however, very inconvenient, especially when the machines which they supply have long ranges of movement.
Our` invention relates to means of communicating Huid-pressure to work such movable machines, these means being applicable in cases where there is a great range of movement without the use of iiexible connections or multiplication of joints, as we will describe, referring to the accompanying drawings.
Figure 1 is a side view, and Fig. 2 an end view, of a hydraulic supply-pipe with apparatus according to our invention applied to it; and Figs. 3 and 4 are respectively longitudinal and transverse sections to an enlarged scale, showing one of the valve arrangements with which the supply-pipe is provided.
The supply-pipe A is made of any length required for the travel of the'crane or other machine, its parts being screw-jointed together, as shown in Fig. 3, with a cylindrical valve, B, interposed between the adjacent lengths, the whole pipe, including the valve boxes which form the junctions of its lengths, being turned or otherwise shaped truly cylindrical on its exterior, so that it can slide without leakage through stuffing-boxes at the ends of a sleeve-pipe, C, which extends over and incloses a considerable length of the pipe A, leaving a free annular space between the eX- draulic machine with which it communicates b v a pipe, D. Itis of advantage to make this pipe D bent and somewhat liexible, and to support the sleeve C by a spring, E, on a bracket projecting from the machine, so that the sleeve can yield a little to inequalities in the movement ofthe machine without straining the pipe A, which the sleeve embraces. 6o
X'Vhen there is a considerable length of pipe A it may be supported at suitable invervals by levers F, having elastic pads j', on which the pipe A rest-s. The levers F are counterweighted sut'ciently to bear the weightof the 65 pipe, their counter-weights G Iusually resting on blocks. The front end ot' each of the levers F carries a roller, H, on which either of the sloped ends lL ofthe machine-frame comes to bear as the machine is moved to or fro. The 7o slope of h depresses the lever F sufficiently to permit the passage of the sleeve-pipe C, which travels with the machine, and when C has passed, the lever F is again raised by its counter-weight to support the pipe A.
The pipe A is provided at intervals With valve-boxes, such as are shown in Figs. 3 and 4, the distance 'from valve-box to valve-box being. somewhat less than the length of the sleeve-pipe C, so that wherever that sleeve- 8o pipe may be there is at least one of the valveboxes within its length. The valve-box has an aperture to the annular space within the sleeve, this aperture being tted with a valve,
K. The stem ofthe valve K works through cup-leathers at the mouth of a cylindrical cavity, L, formed in the Valve-box, and it has iiXed on it a piston, M, packed with cup-leather. Within the stem, which is hollow, is a helical spring, XV, arranged to unseat the valve K; 9o but this spring is not sufficiently strong to unseat the valve in opposition to the pressure of the liquid within the pipe A, tending to keep the valve seated when that pressure is not couuterbalanced.
The cylindrical cavity L communicates at its upper part, by a passage, l', with the interior of the pipe A, and at its lower part, by apassage, Z2, with the middle of another cavity, in which is tted a double-ended valve, N. roo
The spaces above and below this valve coinmunicate, bypassages 0 and P, with the annular space within the sleeve-pipe C, the mouths of O and P being at some distance apart, as shown in Fig. 3.
When the sleeve-pipe C is moved with the machine along the pipe A there is always one of the valve-boxes having the mouths of its passages O and P Wholly within the sleeve, which is made of sufcient length for that purpose. The pressure in the annular space of the sleeve being nearly the same as that within the pipe A, this pressure, communicated through the passages O and P past the valve N, which is in balance, and through the passage Z2, acts on the under side of the piston M, and the force ot' the spring W conspires with it to raise the valve K oft' its seat. Theliquid from A is thus permitted to flow into the annular space ofthe sleeve C, and thence by the pipe D to work the machine.
When by the travel of the machine and the sleeve G either or both of the mouths of O and P come out beyond the stufng-box at either end of the sleeve, then, as liquid escapes by the passage Z2 and past the valves N, the under side of the piston M is relieved from pressure, and consequently the valve K is closed. As the mouths of O and P are at solne distance beyond the valve K in each direction, the valve K will obviously become closed before it passes out beyond the stuffing box of the sleeve C, escape by either of those mouths causing the valve K to be closed. Thus, as
long as the mouths O and P of any of the valve-boxes in the line of the pipeA are both within the traveling sleeve-pipe C, the sleevepipe C is supplied. by the open valve K with liquid under pressure, which is communicated to the machine to which C is connected; but when by the travel of the machine and the sleeve-pipe the stuing-box at its end passes either of the mouths O or P, the valve K is closed and escape of the liquid from A is prevented.
By arranging the levers F so as to correspond in position with the valves K, the pads j' cover these valves when they are outside the sleeve.
Having thus described the nature of our invention and the best means we know ot' putting it in practice, we claiml. The combination of the sliding sleevepipe C, attached and connected by a branch pipe to a movable hydraulic machine, with the stationary supply-pipe A, having, at distances apart lessthan the length ot' the sleevepipe, apertures fitted wi th valves, whereby they are closed when they are outside the sleeve, substantially as herein described.
2. llhe self-closing valve device consisting ofthe spring-valve K, with its piston M fitted to the cavity L, the double-ended valve N, and the orifices O and P and their communicating passages, 'substantially as herein described.
In testimony whereot we, lthe said CHARLES ALGERNON PARsoNs and WILLrAM CRoss, have signed our names to this specification, in the presence of two snbscri bing` witnesses, this 3d day ot' September, A. D. 1880.
CHARLES ALGERNON PARSONS. WILLIAM CROSS.
Witnesses WILLIAM DAGGEfrr, J r., JAMES JoBsoN.