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

page_text: Date of Application, 11th Feb., 1893
Complete Specification Left, 24th Feb., 1893-Accepted, 2nd June, 1893
PROVISIONAL SPECIFICATION.
Valve for Controlling Variable Power Cranes or Lifts.
CORNELIUS CORNES, Engineer, 15 Maze Hill, Greenwich, in the County of
Kent, and WILLIAM ROBERT GREEN, Engineer, The Retreat, Queens Road
Peckham in the County of Surrey, do hereby declare the nature of this invention
to be as follows:-
This invention has for its object the control of say the three cylinders or three
power crane or lift by means of the up and down motion of a single cord or chain
or backward and forward motion of a hand-wheel or lever to open and close the
pressure fluid to any combination of these three cylinders; to bring this into effect
we employ a pressure valve box having two slide valves each covering a pressure
and exhaust port one valve connected to the centre cylinder of the three and the
other to the two outside cylinders the movements of these valves are given by two
grooved cams working on an axis, the grooves being so formed that by giving a
partial rotation of the axis and cams the valve in connection with the middle
cylinder is operated, while the groove of the second cam is concentric and therefore
the valve does not move, if the single or middle cylinder is insufficient to move
the load, the axis of the cams is moved further round when the groove of No. 1.,
valve is returned to its closed position and the groove of its cam becomes
concentric while the groove for No. 2., valve opens to the two outside cylinders,
should the two cylinders be found unequal to the load, a further movement of the
axis and cams then operate both valves together and thus open pressure to all
cylinders. We claim this system of valves and cams to operate two or more
cylinders.
Dated this Tenth day of February 1893.
CORNELIUS CORNES,
WILLM. ROBT. GREEN.
COMPLETE
SPECIFICATION.
Valve for Controlling Variable Power Cranes or Lifts.
We CORNELIUS CORNES Engineer of Tudor House 15 Maze Hill Greenwich in
the County of London and WILLIAM ROBERT GREEN Engineer of the Retreat
Queens Road Peckham in the said 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 valves having for their object the control of cranes
hoists or lifts of variable powers, whereby these variable powers may be put into
operation definitely in succession, by means of one rope, rod, or lever, and providing
an intermediate shut off position to the valves between each power. The invention
consists in the arrangement and combination of parts hereinafter described.
To more clearly explain the invention, reference will be made to the accom-
panying drawings which form part of this Specification, and in which
Figure 1 represents, a part longitudinal section and clevation,
Figure 2 sectional plan with valve cover removed,
Figure 3 a diagram, showing the relative positions of the valves at six equal
divisions of the circle.
Figure 4 lever cams.
Figure 5 cams or grooves arranged to give the same action to valve, by a
vertical oblique or horizontal motion.
A is a base plate or tray carrying the valve box B bearings C C and guide
Pi77

page_text: brackets D the valve box B has two single ported slides E E 1 the slides covering
pressure ports F F and exhaust ports G G 1 the pressure ports F F¹ lead into
separate outlets H H' while the exhaust ports G GI lead into the same outlet J
the two slides E E1 are moved by the spindles K K 1 and a pair of cams L L'1
made in one, or separately fixed to the same axis-these cams L L 1 being carried
by the spindle M and in the bearings C C which may be rotated completely round
partially round by any suitable gearing such as worm and wheel N spar gearing
or directly by lever on the axis or a rope wound on a pulley on the spindle or
axis M.
or
Having described the various parts of the drawings we will now describe its
action, while in use in connection with a crane hoist or lift having three cylinders
and rams, of the usual type used under hydraulic or fluid pressure-the middle
cylinder of the group when in action given the 1st or lowest power, the two
outside cylinders, when in action and the middle one closed give the 2nd or middle
power, and when all three are in action the 3rd or full power. In using the valves
in connection with these three cylinders the pressure outlet H would be connected
to middle cylinder or 1st power the outlet H1 connected to the two outside
cylinders or 2nd power-referring to the position of the valves in Figures 1 and 2
and diagram Figure 3 line a a it will be seen that both outlets, H H¹ are closed
from the pressure side of the valve box, and full open to the exhaust ports-if the
cams L L are turned into the position indicated by 6 Figure 3 the valve E is then
full open to the pressure port F communicating with outlet H and the middle
cylinder described while during the turning of the cams from a to b, owing to the
concentric formation of the cam groove the slide valve E¹ will remain stationary
and unopened if the 1st power be equal to the load, by moving the cams back to
the position a, on diagram it thus again opens to the exhaust for lowering, if
however this first power be not equal to the load, the cams will then be moved
further round in the direction of the arrow to the position e in diagram which will
first close the valves from pressure and then continuing the rotation in the same
direction to, d, the valve El will be opened to the pressure port F and outlet H¹
connecting the two outside cylinders or 2nd power, during the movement of cams
from c to d owing to the groove in cam L being now concentric, the valve E
remains unmoved and closed from pressure to the middle cylinder if this second
power be found equal to load by moving the cams back from d to the closing of
pressure and opening to exhaust will take place for lowering-if however the
2nd power be found unequal to the load, the cams L L will be further turned in
the direction of the arrow, from d to e in diagram when the position of all closed
from pressure is again given and by further turning the cams in the direction of
the arrow from e to f in the diagram.3 both valves E E¹ will be opened together,
to the ports F F and outlets H H and thus by means of the connection pipes all
the three cylinders will be put under pressure, while the closing and exhausting,
and consequent stopping and lowering, is effected by moving the cams L L' back-
ward from toe in the contrary direction of the arrow, when this valve is applied
to a single and double power crane, such as a ram and piston fitted into one
cylinder or two cylinders of unequal diameters, similar valves will be used, except
in that case the cams would not require the third motion in which both valves are
moved together. The path of the two cams L L in Figure 1 Sheet 1 and diagram
Figure 3 Sheet 2 are shewn in dots and dashes, L by dots and L' by dashes-and
at the points d to a both following the same path their course is therefore indicated
by alternate dots and dashes.
Where this invention is operated by a lever motion the cams will then be
arranged in the manner indicated by Figure 4 Sheet 2.
Having now particularly described and ascertained the nature of our said
invention and in manner the same is to be performed what we declare that what
we claim is
First. A valve box controlling the admission of pressure and exhaust to variable

page_text: power cranes hoists or lifts-operated by means of a single rope or lever and
having a definite action.
Second. A valve box in which a definite closing motion is given to all or any
power between the change from one power to the next.
Third. A valve box in which this definite closing to any power takes place by
the backward or forward motion of the cams and of the rope or lever between the
change of powers.
In witness whereof we the said Cornelius Cornes and William Robert Green
have hereunto set our hands and seals this Twenty-second day of February
in the year of our Lord One thousand eight hundred and ninety three.
Signed, sealed, and delivered in the presence of
D. and W. R. GREEN,
The Retreat, Peckhamn, S.E.
CORNELIUS CORNES.
WILLM. ROBT. GREEN.