Improvements in Cranes.
Year: 1893

page_text: Date of Application, 7th Feb., 1893-Accepted, 1st Apr., 1893
COMPLETE SPECIFICATION.
Improvements in Cranes.
I, ERNEST WARHAM NAYLOR, Kemble Building, corner of Stone and
Whitehall Streets, in the City of New York, and State of New York, one of the
United States of America, Engineer, 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:-
The object of my invention is to provide a jib crane, and mechanism for operating
its various parts, which is adapted to range a large floor space without the
employment of a trolley or crab. My invention relates to the construction and
arrangement of the various parts of the crane and its operating mechanism; and it
consists in the construction and combination of parts hereinafter described and
pointed out definitely in the claims.
In the drawing, Figure 1 is an elevation of my improved crane, and Figure 2 is
a top view of the same.
I will now proceed to describe in detail the embodiment of my invention which is
shown in the drawing, after which I will definitely point out the invention in the
claims.
In
Referring to the parts by letters, A represents the main jib, the post A' of which
is hinged to the wall brackets bb, or is supported by any other suitable means.
A supplemental jib C is hinged to the outer end of the main jib as shown. On the
outer end of the supplemental jib a sheave c is mounted. A sheave c is also carried
by the crane, and over it the boisting cable H passes from the sheave c.
order that this sheave c¹ may always maintain the proper relation with the sheave c,
whatever be the relative position of the two jibs, the sheave c¹ must have a
Swivelling movement, on a vertical axis, with reference to the main jib. I secure
this result and an operative connection between the take-up mechanism and the
hoisting cable by the following construction and arrangement of parts ;-The
post C of the supplemental jib is hollow, whereby the hoisting cable may pass
axially through it. The sheave c¹ is mounted on the supplemental jib at a point
where its face on one side of its axis is in the axial line of the post C). A sheave a
is mounted on the main jib with its face on one side of its axis in the same axial
line. The hoisting cable H passes up and over the sheave e, over and down from
the sheave el, in the axial line of the post C¹, around and under the sheave a,
around a sheave a¹, also mounted on the main jib, to the take up mechanism which
is carried on the main jib. By the above described construction and arrangement
of parts the hoisting cable may be taken in or paid out regardless of the relative
positions of the main and supplemental jibs.
The take up mechanism shown in the drawing consists of a hydraulic cylinder B,
its ram b, and the desired number of sheaves 63. The construction of this
mechanism is familiar to all acquainted with hydraulic engineering, and its details
are no part of the invention herein shown. In fact any kind of hoisting mechanism
which may be carried on the main jib may be used to take up the cable.
The supplemental jib is swung on its pivot by means of two hydraulic
symmetrically placed cylinders E, and their rams e', either of which may be
connected with the pressure column when the other is connected with the exhaust
column. A sheave or drum F is secured to the post of the supplemental jib, and is
placed axially with reference thereto. A cable f is attached at or near its middle
o this sheave, and one end is connected with one ram e and the other with the
other ram el. By these means the sheave F may be turned in either direction,
hereby causing the supplemental jib to turn on its pivot in either direction.
The main jib is swung on its pivot by substantially the same kind of mechanism.
D

page_text: Two hydraulic cylinders G G¹ and their rams 9 glare carried on the main jib.
A. cable is fastened at its ends, to said rams respectively, and, at or near its middle,
to a fixed sheave 1 which is placed axially with reference to the main jib post and
is fastened to the bracket b. The hydraulic pressure and exhaust columns are
carried to the main jib by means of pipes K K' connected by stuffing boxes k k¹
arranged in the axial line of the main jib. Both columns pass to and are connected,
by a nest of valves at J on the main jib. A single operator sitting on the main jib
can control the operation of all the hydraulic rams hereinbefore explained, and
therefore of both jibs and the hoisting mechanism.
It is not believed that any power jib crane has ever been constructed which could
range such a large floor space without the use of a travelling trolley. An object on
the floor at any point from within a few feet of the main post to the extreme reach
of both jibs, may be lifted and carried to and deposited at any other point within
said limits, by the crane, and all of the movements may be controlled by a single
operator at the valve.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what §
claim is:
3.
1. The combination of a fixed support, a main jib hinged thereto, a supplemental
jib hinged to the main jib, two independent motors mounted on the main jib,
mechanism connecting one of said motors with the supplemental jib whereby the
latter may be swung on its axis, and mechanism connecting the other motor with
the fixed support whereby the main jib may be swung on its axis, substantially as
and for the purpose specified.
2. The combination of a fixed support, a main jib hinged thereto, a supplemental
jib hinged to the main jib, a sheave e fixed to the supplemental jib, a hoisting cable
which passes over said sheave, sheaves over which said cable passes to the main jib,
three independent motors mounted on the main jib, mechanism connecting one
motor with the fixed support, mechanism connecting another motor with the
supplemental jib, and cable take up mechanism suitably connected with the third
motor, whereby the main jib and the supplemental jib and hoisting cable may be
independently operated, substantially as and for the purpose specified.
3. The combination of a main jib, and a supplemental jib hinged thereto,
mechanism for turning the main jib on its axis, mechanism for turning the
supplemental jib on its axis, independent hydraulic motors for operating said
turning mechanisms, with two pipes arranged axially with reference to the main
jib, for conveying the hydraulic pressure to and from the main jib, and a nest of
valves on the main jib for controlling the movement of the hydraulic columns,
substantially as set forth.
Dated this 3rd day of January 1893.