Improvements in Cranes.
Year: 1893

page_text: Date of Application, 7th Feb., 1893-Accepted, 18th Mar., 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 :-
My invention relates to jib cranes which consist of a main jib and a supplemental
jib hinged thereto; and my objects are, first, to provide a novel construction and
combination of parts by means of which a load may be lifted from the floor of the
room in which the crane is placed and moved to and deposited through a door in
the wall which supports the crane and behind its main supporting post; and second,
to provide certain novel combinations of mechanism for operating the several parts
of the crane.
I will now proceed to describe the crane shown in the drawing which embodies
the invention, after which the invention will be particularly pointed out in the
claims.
In the drawing,
Figure 1 is a side elevation of my improved crane, and
Figure 2 is a top view of the same.
either
A represents the main jib, which is pivoted by means of the post B to the
supporting brackets b¹ secured to the wall F. This main jib consists of suitable
vertical and horizontal beams and diagonal braces to make it strong and stiff
enough to support its load, which normally includes the supplemental jib and the
operating mechanism. To the free end of the main jib is hinged a supplemental
jib C which lies wholly outside of the main jib,-that is to say, it
placed above the upper horizontal beams, or below the lower horizontal beams
whereby the main jib does not at any time interfere with the movertent of the
supplemental jib. The supplemental jib is longer than the main jib whereby its
end extends past the post B when the parts are in the relative position as shown
in the drawing. In order to properly support the supplemental jib it is provided
with a long post c which passes through the post D on the main jib, and is stepped
at its lower end in a suitable bearing. The posts c and D are hollow so that the
hoisting cable may pass axially through them. At the outer end of the supplemental
A sheave d is fixed to
jib a sheave c¹ is fixed over which the hoisting cable runs.
the supplemental jib in such position that its face on one side of its center is in the
axial line of the post c.
A third sheave a is fixed to the main jib in the axial
line of the post. D, and the hoisting cable passes over the sheaves c, d and a to the
take-up mechanism which is carried on the main jib.
The supplemental jib is turned upon its axis by means of a worm wheel E
secured axially to the post e, and a worm e mounted on the main jib. This worm
is driven by a hydraulic motor F. The main jib is turned on its axis by means of
a worm wheel G fixed to the bracket 6 concentric with the post B, and a worm g
carried by the main jib. This worm is driven by the independent hydraulic
motor H. The hoisting cable is taken up and paid out by the hydraulic cylinder L,
its ram l, and the sheaves operating in the usual manner.
The hydraulic pressure and exhaust columus pass to a nest of valves on the main
jib, through pipes M and N which are arranged axially with reference to the post B
of the main jib, and are provided with suitable stuffing boxes. The movement of
the water to and from the independent motors F and H and the cylinder L is
controlled by the valves on the main jib.
By the construction and arrangement of parts shown and described a load may

page_text: be taken from any point on the floor from within a few feet of the main jib post,
to any point as far as both jibs will reach, lifted and deposited at any other point
within said limits or through an opening in the wall which supports the crane;
and all of these movements are under the control of one man on the main jib.
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 I
claim is:
e
1. The combination of a main jib pivoted to suitable supports, and a supplemental
jib longer than the main jib lying outside of the main jib, and pivoted to its free
end, and independent motors carried on the main jib and adapted to turn said
main and supplemental jibs on their respective axes, substantially as set forth.
2. The combination of a pivoted maiu jib, and a supplemental jib hinged to its
free end, with a worm wheel secured axially to the supplemental jib, a worm
mounted on the main jib, and a motor for operating said worm, substantially as
set forth.
3. The combination of a main jib hinged to suitable supports, a fixed worm
wheel placed axially with reference to the mast of said jib, a worm mounted on
_said jib and a motor for operating said worm, with a supplemental jib hinged to the
free end of the main jib, a worm wheel secured axially to said supplemental jib,
a worm mounted on the main jib and an independent motor for operating the said
worm, substantially as set forth.
Dated this 3rd day of January 1893.