Improvements in Cranes and the like.
Year: 1898

page_text: Improvements in Cranes and the like.
We, HENRY CLAUDE WALKER and CHARLES WILLIAM HILDRED, both of the
Newington Iron Works, Falmouth Road, London, S.E., Engineers, do hereby
declare the nature of this invention to be as follows:-
26
derricking
"
Our invention relates to cranes and the like fitted with luffing or
jibs and has for its object improvements in means for working or luffing the jib
for the purpose amongst others of economizing the power required.
In applying our invention to hydraulic cranes we employ an hydraulic cylinder
provided with ram and multiplying sheaves in the usual manner. Instead, how-
ever, of attaching one end of the chain or rope to the jib and the other to a fust
end or abutment we attach both ends to the jib at different positions. This allows
of the better support of the jib and facilitates the luffing or derricking of jibs
which are considerably longer than their pillars or posts.
In cases where electric or other power is used to work the crane we use
similar multiplying sheaves and ropes or chains, a screw and nut or like mechanism
taking the place of the hydraulic ram.
Dated this 18th day of Anril 1898
HENRY C. WALKER.
CHAS. W. HILDRED.
Improvements in Cranes and the like.
We, HENRY CLAUDE WALKER and CHARLES WILLIAM HILDRED, both of the
Newington Iron Works, Falmouth Road, London, S.E., Engineers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following state-
ment:-
Our invention relates to cranes and the like fitted with luffing and derricking
jibs and has for its object improvements in means for working or luffing the jib
for the purpose amongst others of economizing the power required.
In applying our invention to hydraulic cranes we employ an hydraulic cylinder
provided with ram and multiplying sheaves in the usual manner. Instead how-
ever of attaching one end of the chain or rope to the jib and the other to a fast
end or abutment we attach both ends to the jib at different positions. This allows
P 71

page_text: of the better support of the jib and facilitates the lufting or derricking of jibs
which are considerably longer than their pillars or posts.
In cases where electric or other power is used to work the crane we use
similar multiplying sheaves and ropes or chains, a screw and nut or like mechanism
taking the place of the hydraulic ram.
The accompanying drawing shows our invention as applied to wall cranes and
the like the different figures showing different luffing apparatus.
The lifting and turning or slewing mechanism is omitted from these views as
they form no part of the present invention.
Fig. 1 shows a jib A supported by a chain E, E the two ends of which are
attached at e, e' to the jib. This chain passes around conveyance sheaves D₁ and
under the sheave C of a crosshead attached to the ram b of an hydraulic cylinder B
of ordinary construction. The dotted lines A', C' show the jib raised and the cross-
head sheave when the ram b is out.
Fig. 2 shows an hydraulic cylinder B having two crosshead sheaves C moved by
the ram b, this arrangement being more particularly applicable where it would
be inconvenient to give the ram the longer stroke required by the arrangement
shown in Fig. 1.
Fig. 3 shows an arrangement in which the rope E E¹ passes around two multi-
plying sheaves C carried on a crosshead having a nut engaging with a screw f.
This screw is caused to rotate by an electric motor F or other means to cause the
multiplying sheaves C to move nearer to or further from the sheave G and so let
out or haul in the chains E, E¹.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed we declare that what we
claim is:-
In derricking or luffing cranes or the like in which the jib is raised or lowered by
chains or ropes passing around sheaves carried the crossheads of hydraulic
cylinders or equivalent mechanism; attaching both ends of the said chains or ropes
at different points of the jib substantially as set forth in the foregoing specification.
Dated this Sixteenth day of December 1898.
HENRY C. WALKER.
CHARLES W. HILDRED.