An Improved Valve, Principally Applicable to Hydraulic Elevators.
Year: 1890

page_text: An Improved Valve, Principally Applicable to Hydraulic
Elevators.
We, EDWARD HUGHES, EDWARD Joseph RIGBY, and JOHN SINCLAIR PIRRIE all of
Hanna Street, South Melbourne in the Colony of Victoria, Engineers, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention has been devised for the purpose of providing a simple and inex-
pensive valve which will be specially applicable for use in connection with hydraulic
elevators and which will not be liable to become choked or blocked by pieces of stone
or rock wedging between the valve and its seating and one moreover wherein the
leather or other packing rings or collars will not be subjected to so much wear and
tear as is the case with the hydraulic valves at present in use.
The essential feature in our invention is the employment of a hollow longitudinally
sliding spindle constructed as hereinafter described in combination with a cylindrical
casing constructed and arranged to clamp a pair of leather or other packing collars
or rings around said hollow-spindle as -illustrated in the accompanying drawings
wherein,
Figure 1 is a side elevation of a valve constructed according to our invention
whilst
Figures 2, 3, 4 and 5 are longitudinal sections of same and
Figures 6 and 7 are transverse sections respectively on lines x x and y y of
figure 3.
A A' represent the hollow spindle hereinbefore mentioned which is secured at its
upper end to the rod a which latter passes through a stuffing box a¹ and is connected
at its outer end to any convenient device for operating same such for instance as a
lever connected to a rope passing through the cage. This hollow spindle is provided
with three sets of ports B, C and D whilst its lower end is left open preferably as
shown and said spindle is enclosed within a casing preferably made in three separate
parts or sections E, E¹, E³, held together by bolts e passing through lugs el provided
on the inner ends of each of the outer parts E, E2 of the said casing. These said
inner ends are each recessed as shewn at fand in each of said recesses is fitted a
leather or other packing collar or ring F which is clamped tightly between the two
outer sections E E² and the inner section E¹. This said inner section E' forms a
chamber g round the spindle A and is provided with an outlet G which is connected
with the ram cylinder of the elevator whilst the upper section E (which also forms a
chamber round said spindle) is in communication with the water main.
The operation of our invention will be readily understood on reference to
figures 3, 4 and 5 of which figure 3 illustrates the hollow spindle A A¹ in the
position which it occupies when the supply is cut off from the ram cylinder that is
to say, said spindle is drawn up into such a position as will bring a solid part
opposite to the chamber g which as above mentioned communicates with the ram
cylinder. If it is desired to allow the water to flow into this latter say for instance
in order to raise the cage of the elevator the said hollow spindle is lowered into
the position shewn in Figure 4 that is until the central ports Care opposite to the
chamber 9 in the central section E¹ of the valve casing as clearly illustrated in
Figure 4. It is obvious that the water will now be able to flow from the main
through the ports B and C to the ram cylinder. When it is desired to empty this
latter the said spindle is drawn up to its fullest extent into the position shewn in
Figure 5 that is until the ports D are opposite the chamber 9 when the water in said
cylinder will be free to flow through said ports and through the lower end of the
spindle A A' into the lower section E of the valve casing and from thence to

page_text: waste. It will be obvious to any person skilled in the art to which our invention
relates that it will be impossible for any pieces of rock or sand to become jammed
between the spindle A.A and the packing rings F and that the latter will not be
subjected to so much wear and tear as in ordinary hydraulic valves.
Having now particularly described and ascertained the nature of our said inven- 5
tion and in what manner the same is to be performed we declare that what we
.claim is:
In a valve the combination with a hollow longitudinally sliding spindle (such
as A A') provided with three sets of ports (such as B, C and D) and made with two
compartments (such as A and A') the latter being left open at its lower end, of a 1
valve casing (preferably made in three distinct parts (such as E E¹ E²) adapted to
retain a pair of leather or other packing collars or rings (such as F) in position
around said hollow spindle substantially as and for the purposes specified and
illustrated in our drawings.
Dated this Twenty-second day of January One thousand eight hundred and 1
ninety.
EDWARDS & Co.,
35, Southampton Buildings, Chancery Lane, London,
Agents for the Applicants.