improvements in Suspended Hydraulic Llits.
Year: 1897

page_text: Date of Application, 10th June, 1897
Complete Specification Left, 10th Mar., 1898-Accepted, 16th Apr., 1898
improvements in Suspended Hydraulic Llits.
JOHN SANDERS STEVENS, CHARLES GEORGE MAJOR, and EDWIN CHARLES STEVENS,
Engineers, of Janus Works, Queen's Road, Battersea, in the County of London,
do hereby declare the nature of this invention to be as follows:-
:-
Our invention relates to multiplying or "Jigger" cylinders employed to actuate
suspended hydraulic lifts..
It has hitherto been customary to construct such cylinders so that when disposed
in a vertical position, they may be supported upon a foundation at the base;
or secured to a convenient wall, upright girders or columns; or bolted to the girders
carrying the floors of the building.
But there are many cases wherein either and all of such supports are impossible,
or at least extremely inconvenient to provide.
In our cylinder we meet this difficulty by suspending the entire cylinder and
all its appurtenances pendulum-wise from overhead girders, preferably those which
carry the ordinary head gear of the lift; and we secure it to the girders by strong
bolts carried up from the upper end of the cylinder.
We sometimes construct such cylinders with differential rams, a large power
ram working through the bottom of the cyclinder, having attached to it a smaller
ram working through the top end of the cylinder and carrying the multiplying
wheels and crosshead. In this arrangement the suspending bolts serve as effective
guides for the crosshead.
All cylinders suspended as described have the incidental advantage that their
natural tendency is to hang plumb and in true line; they are therefore more
readily fixed, and very slight staying is required to hold them in position as against
horizontal movement.
Dated this Tenth day of June 1897.
Improvements in Suspended Hydraulic Lifts.
JOHN SANDERS STEVENS, CHARLES GEORGE MAJOR, and EDWIN CHARLES STEVENS,
Engineers, of Janus Works, Queen's Road, Battersea, 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:-
Our invention relates to multiplying or “Jigger” cylinders employed to actuate
suspended hydraulic lifts.

page_text: It has hitherto been customary to construct such cylinders so that when disposed
in a vertical position, they may be supported upon a foundation at the base;
or secured to a convenient wall, upright girders or columns; or bolted to the girders
carrying the floor of the building.
But there are many cases wherein either and all of such supports are impossible,
or at least extremely inconvenient to provide.
In our cylinder we meet this difficulty by suspending the entire cylinder A
Fig. 1 and all its appurtenances pendulum-wise from overhead girders, B B
preferably those which carry the ordinary head gear of the lift; and we secure it
to the girders B B by strong bolts CC carried up from the upper end of the
cylinder A.
We construct such cylinders with differential rams, a large power ram D working
through the bottom of the cylinder A having attached to it a smaller ram or tail
rod E working through the top end of the cylinder and carrying the travelling
multiplying wheels F and crosshead G. In this arrangement the suspending
bolts UC serve as effective guides for the crosshead G.
The fixed multiplying wheels H are carried in the overhead plate I from
which the suspension bolts C C are also hung. Balance weights J are attached
to the bottom of ram when the cylinder is used with a cage or platform.
Fig. 2, is a plan of the overhead plate I resting on girders B B.
Fig. 3 is a plan of the travelling wheels F, guide bolts C C and crosshead G.
Figs. 4 to 7 illustrate a modification used for variable power jiggers. The parts
lettered A to J are the same as already described. But two additional cylinders k
and L are employed, containing rams M and N attached to a common crosshead O,
so that the united effort of the three rams is brought to bear upon the tail rod E.
Fig. 7 is a horizontal section through the three cylinders.
Figs. 8 to 11 illustrate a modified form of variable power arrangement. The
difference from Fig. 4 being that the two rams M & N are fitted with tail rods E E
in place of a single one to ram D.
Any number of cylinders and rams may be similarly arranged to work in
conjunction, and suspended in the same manner.
Similar parts have same letters of reference throughout the figures.
All cylinders suspended as described have the incidental advantage that their
natural tendency is to hang plumb and in true line; they are therefore more
readily fixed, and very slight staying is required to hold them in position as against
horizontal movement.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
(1) In hydraulic lifts, a cylinder with differential ram suspended as described
and illustrated Figs. 1 to 3.
(2) In multiple power hydraulic lifts two, three or more cylinders, with one or
more differential rams suspended as described and illustrated Figs. 4 to 11.
(b) In hydraulic lifts the method of suspending multiplying cylinders as
described.
(4) In suspended cylinders the use of the suspending bolts as guides for the
crosshead as described.
Dated this Tenth day of March 1898.
JOHN SANDERS STEVENS.
CHARLES GEORGE MAJOR.
EDWIN CHARLES STEVENS.