Improvements in and relating to Water Distributing Valves for Lifts or Hoists.
Year: 1897

page_text: Date of Application, 26th Nov., 1897
Complete Specification Left, 25th Aug., 1898-Accepted, 12th Nov., 1898
Improvements in and relating to Water Distributing Valves for
Lifts or Hoists.
1, JOHN ALEXANDER STEVEN, of 12, Royal Crescent, West, in the County of
the City of Glasgow, Engineer, do hereby declare the nature of my invention to
be as follows:-
This invention has reference to a new or improved automatic acting water
distributing valve or valves to be used in connection with lifts or hoists, where two
or more cylinders are used, and has for its object to raise loads where their weight
may vary considerably. When a light load has to be raised, one cylinder is only
used. Where the load is greater than one cylinder can raise, this valve automatically
admits water to second cylinder, and so on automatically admitting water as
required to as many cylinders as is necessary.
The improved valve or valves is placed between the usual operating valve and
the lift, and when the operating valve of lift is opened, the water passes direct to
the first cylinder and to the aunular piston of distributing valve at the same
time. The piston will be loaded either with weights or springs, so as to rise when
a certain pressure has been attained. This piston is formed with ports and on its
rising the inlet water passes by these ports through passages or chambers to act ou
a piston valve working in a cylinder preferably in the same casting, and on this
piston valve rising, the water passes through a radial brauch to the second
cylinder. This valve is designed to automatically admit water to the second
cylinder when the first is insufficient, and this is duplicated when more cylinders
are required.
When the communication to the second cylinder is opened the pressure in the
inlet branch to first cylinder falls, as would also the piston, but this is maintained
by the admission of water from the passages or chambers leading to piston valve
acting on the bottom of first piston, but when the pressure in inlet branch falls
below the fixed point, the first piston and piston valve would fall and the return
water from the second cylinder would pass through the radial branch leading to
same by a port and valve to a branch leading to inlet branch of first cylinder. The
chambers between first piston and piston valve are also open to an exhaust
branch.
Dated 25th day of Narambar 1807
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Water Distributing Valves for
Lifts or Hoists.
I, JOHN ALEXANDER STEVEN, of 12, Royal Crescent, West, in the County of the
City of Glasgow, Engineer, do hereby declare the nature of my invention and in
what manuer the same is to be performed to be particularly described and ascer-
tained in and by the following statement, that is to say :--
This invention has reference to a now or improved automatic acting water
distributing valve or valves to be used in connection with lifts or hoists, where two
or more cylinders are used, and has for its object to raise loads where their weight
may vary considerably. When a light load has to be raised, one cylinder is only
used. Where the load is greater than one cylinder can raise, this valve automatically
admits water to second cylinder, and so on automatically admitting water as required
to as many cylinders as is necessary.
And in order that my said invention and the manner of carrying same into
practice may be properly understood, I have hereunto appended a sheet of drawings
in which Figures 1 and 2 represent sections of automatic distributing valve or valves
as constructed in accordance with my improvements.
Referring to these drawings:-
The improved valve or valves is placed between the usual operating valve and
the lift, and when the operating valve of lift is opened the water passes direct to
the first cylinder and to the annular piston A through the branch B of distributing
valve at the same time. The piston A will be loaded either with weights or springs
so as to rise when a certain pressure has been attained. This piston A is formed
with ports as shown and on its rising, the inlet water passes by these ports through
passages or chambers CCC to act on a piston valve Dworking in a cylinder
preferably in the same casting, and on this piston valve D rising, the water passes
through the branches B, B and thence through the branch E to the second cylinder.
This valve D is designed to automatically admit water to the second cylinder.
when the first is insufficient and this is duplicated when more cylinders are
required.
When the communication to the second cylinder is opened the pressure in the
inlet branch B to first cylinder falls, as would also the piston A, but this is
maintained by the admission of water from the passages in chambers CC1
leading to bottom of piston A, and when the pressure in branch B falls below a fixed
point both pistons A D would fall and the return water would pass through the
ports EFF to B. The chambers C, C1, C2, would also be open to an exhaust port G.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
First. An automatic acting water distributing valve or valves for lifts or hoists
constructed substantially as herein described in reference to and shown in the
accompanying drawings.
Second. In connection with lifts or boists the arrangement and combination
of branches with pistons and ports forming an automatic acting water distributing
valve or valves, substantially as set forth.
2 1000