Improvements in and relating to Valves for Hydraulic Hoists and the like.
Year: 1898

page_text: Date of Application, 18th Mar., 1898
Complete Specification Left, 17th Dec., 1898-Accepted, 28th Jan.,
1899
PROVISIONAL SPECIFICATION.
Improvements in and relating to Valves for Hydraulic Hoists
and the like.
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
to be as follows:-
This invention has reference to improvements in and relating to valves for
hydraulic hoists or lifts and the like.
According to my improvements the valve would be much of the usual piston
construction with cup leathers working within brass liners preferably constructed
in three lengths having slit passages of unequal lengths for graduating supply
of water and locked in position by end cover in a cylindrical casing, and having
an inlet water supply port and outlets from the casing to operate hoist, and from
hoist to rear end of casing and drain.
33
" 66
A lever would be fulcrumed on an arm projecting from casing, and be con-
nected near its centre to the rod operating the piston valve, while its free end
would be connected to a rack and working against a guide pulley. A toothed
wheel would be mounted on the spindle on which is keyed a rope pulley which is
operated by a rope to actuate hoist, and this wheel would gear with rack so that
full
same may be worked to place the lever in the positions for "full heave
lower or inactive normal position." By this means the valve will be operated
to uncover the port leading to hoist, or the exhaust port from the latter to drain.
A ratchet wheel is mounted on piston valve spindle and a hinged lever or arm
is mounted on end of valve operating lever, and has a pawl shaped end which
engages into the teeth of ratchet wheel when the operating lever is raised to its
highest position, and in doing so revolves spindle thereby preventing leathers
being grooved. But when lever descends the pawl disengages with ratchet wheel
thereby allowing valve spindle to descend without rotary motion.
Doted the 17th day of March 1898.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Valves for Hydraulic Hoists
and the like.
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 manner the same is to be performed. to be particularly described and
ascertained in and by the following statement, that is to say:-
This invention has reference to improvements in and relating to valves for
hydraulic hoists or lifts and the like.

page_text: 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 explana-
tory drawings in which Figure 1 is a sectional elevation and Figure 2 an end view
illustrating my improvements in valves for hoists, while Figure 3 is a detached
view of a modified form of operating fittings.
Referring to these drawings:--
According to my improvements the valve A would be much of the usual piston
construction with cup leathers A working within brass liners preferably con-
structed in three lengths a, a¹a having slit passages b of unequal lengths for
graduating supply of water and locked in position by end cover in a cylindrical
casing B, and having an inlet water supply port e and outlets e e¹ from the casing
to operate hoist, and from hoist to rear end of casing and drain.
"
A lever C would be fulcrumed at C¹ on an arm projecting from casing, and
be connected at (3 near its centre to the rod D operating the piston valve A, while
its free end would be connected at C4 to a rack E and working against a guide
pulley E.
A toothed wheel E2 would be mounted on the spindle E³ on which
is keyed a rope pulley which is operated by a rope to actuate hoist, and this
wheel E2 would gear with teeth of rack so that same may be worked to place the
lever in the positions for full heave and full lower" as shown in dotted lines
or "inactive normal position. By this means the valve A will be operated to
uncover the port or el leading to hoist, or the exhaust port e from the latter
to drain. A ratchet wheel F is mounted on piston valve spindle D and a hinged
lever or arm is mounted on end C of valve operating lever C, and has a pawl
shaped end which engages into the teeth of ratchet wheel F when the operating
lever is raised to its highest position, and in doing so revolves spindle D thereby
preventing leathers being grooved. But when lever C descends the pawl F2 dis-
engages with ratchet wheel F thereby allowing valve spindle D to descend without
rotary motion.
Instead of using the rack and pinion the lever C as shown in Figure 3, can
be operated direct by a usual rope and pulley.
Having now particularly described and ascertained the nature of my said
invention and the manner in which it is to be performed I declare that what
I claim is:--
First. In connection with valves for hydraulic hoists and the like, the method
of giving a rotary motion to same, substantially as and for the purposes set forth.
Second. In connection with valves for hydraulic hoists, and the like, the
operating lever in combination with a ratchet wheel and pawl and valve rod,
substantially as herein set forth.
Third. The general arrangement in combination of the parts of actuating
appliances for operating valves for hoists and the like, substantially as herein
described in reference to and shown in the accompanying drawings.
Dated the 16th day of December 1898.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.