Valve for Controlling Variable Power Cranes, Hoists, or Lifts.
Year: 1893

page_text: Date of Application. 18th May, 1893-Accepted, 9th Sept., 1893
COMPLETE SPECIFICATION.
Valve for Controlling Variable Power Cranes, Hoists, or Lifts.
I CORNELIUS CORNES Engineer of Tudor House 15 Maze Hill Greenwich in
the County of London, 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 relates to a valve having for its object the control of cranes hoists
or lifts of variable powers, whereby the variable powers may be put into operation
definitely in succession by the means of one rope rod or lever and providing an
intermediate shut off position to the valve, between each change of power-
admitting of the crane, hoist or lift being changed from 1st power to second or
second to third power while the load is suspended at any intermediate stage or
stopping place, and after being used in the second or third powers to ascend and a
lowering operation through any distance having been performed the valve always
will return to first or lowest power.
The invention consists in arrangment and the combination of parts hereinafter
described, and to more clearly explain this invention, reference will be made to the
accompanying drawings and which form part of this Specification and in which
Figure 1 represents a section of the valve box and slide valves.
Figure 2. plan of valve with slide valve cover removed.
Figures 3. 4. 5 and 6 slide valve face and slide valves in their various position of
exhausting and admitting pressure to 1st 2nd and 3rd powers.
A is a valve box with cover removed in plan on the face of which are three ports
or openings-the centre one B being the exhaust while C port is in communication
with the centre cylinder or No. 2 of a group of 3 hydraulic cylinders D being in
communication with two outside cylinders Nos. 1 and 3 the centre cylinder or No. 2
when open to pressure gives the 1st power, the two outside cylinders or Nos. 1
and 3 with the centre oue shut off the 2nd power and when all the 3 cylinders
Nos. 1, 2 and 3 are open to pressure the third power is obtained. Working over
this three ported valve face, a gridiron value V is used, having on its bottom face
a D shaped exhaust oriface W that puts both the pressure port C and D in
communication with the exhaust port B the slide V has two ports E and F
corresponding to the pressure ports C and D, this slide being operated in its travel
by a spindle S working through a stuffing box by means of a cam lever or any
suitable contrivance from the rope passing through the lift room, the ports E, F,
on V are cut right through the slide valve V and this valve is fitted with two
riding valves I. I' and serving to cover the port E and F from pressure when
passing from 1st to 2nd or 2nd to 3rd powers or to exhaust-otherwise the lift if
only partly loaded would ascend while the valve V was passing to exhaust or when
changing from one power to another.
The working or action of this valve under its various positions are shewn in
Figures 3, 4, 5 & 6. Figure 3 shows the valve open to exhaust and the ports "C"
and "D" shut off from pressure-and the valve will return to this position after
being used in the 1st 2nd or 3rd power-when working in the first power the valve
will then be in the position shown by Figure 4-the travel of the main slide
valve V being through a distance equal to J. K and both the riding valves I
and I would not alter their relative position with the main slide valve
backward and forwards with it and this action will admit pressure to the No. 2 or
centre cylinder of the group of three cylinders if the first power is unequal to the
load the valve will be further moved to the left hand the action of which will be to
first close the port E by means of the riding valve I, which is jointed to the main
slide V at L coming against a stop N and the D and F will be brought directly
but move

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I
over each other as shewn in Figure 5 and this admitting pressure to the 2 outside
cylinders Nos. 1 & 3 or 2nd power, if this power be found equal to the duty
required the lift will ascend, and by moving the valve V back the port D will be
cut off from pressure and when required to lower or exhaust a further backward
motion of the main slide V in the same direction will first carry the riding valve I
with it, still covering port E until the travel back brings the riding valve against
the stop M. which will then reopen port E but not until it has passed over C and
when the second power has exhausted the slide is then in the proper position for
working again in 1st power as shewn in Figure 3, if however the 2nd power be
found unequal to its load, by moving the valve still further to the left the riding
valve I will be carried against the stop N₁ and first close the port F and open
both C & D. to the pressure as shewn in Figure and thus admitting pressure to
all 3 cylinders the riding valves I, I will be moved still further to the right by the
stops N and N2 and still covering the ports E and F in the slide valve V on moving
the main side to the right to stop the motion of the lift ports C and D will be first
closed and the riding valves I and I still cover the ports E and F while passing
over C and D on its way to exhaust until they come against the stops M and M¹
which will reopen them to the position shewn in Figure 3.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is
First. A valve controlling the admission of pressure, fluid stopping and exhausting
same from variable power cranes, hoists or lifts, operated by means of a single up
and down motion of one rope, rod or lever.
Second. A valve that has a definite action, and can be changed from one power
to another while the load or ascending room is in suspension.
Third. After the cycle of operations in 2nd or 3rd powers the valve always
returns to the position of 1st power.
In witness whereof I Cornelius Cornes have hereunto set my hand and seal this
Eleventh day of May in the year of our Lord One thousand eight hundred
and ninety-three.
Signed, sealed, and delivered in the presence of
LEONARD CORNES,
15, Maze Hill,
Greenwich.
CORNELIUS CORNES.