Improvements in Travelling Overhead Jib-cranes.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Travelling Overhead Jib-cranes.
I, WILLIAM ROGER DAWE, of 82 Andover Street, in the City of Sheffield,
Works Manager, do hereby declare the nature of my invention to be as
follows:-
My invention relates to overhead or overhung travelling cranes, and has for its
object the construction of an overhead crane with jib fitted with a travelling
carriage, and capable of lifting, swinging, travelling and handling a load suspended
from the end or any point of the jib; with all requisite mechanism for working the
several motions, and constructed to run upon or within a track consisting of two
special girders, or upon the transverse girders of an ordinary travelling crane as
an auxiliary thereto.
It consists in its most simple form for example, of a carriage provided with
travelling wheels or rollers by which the carriage is suspended from a pair of
fixed girders or rails upon which the carriage travels, the motion being obtained
by means of a suspended loop chain actuating the travelling wheels through
intermediate gearing.
The lower part of the carriage is circular in form, and upon the upper and
lower sides of outer edge of the carriage a circular path is formed for the jib
rollers to travel upon.
The jib is secured underneath the circular part of the carriage by means of a
strong central bolt which passes up through the carriage, the nut at the top being
supported upon ball or roller bearings.
At the back end of the jib one or more rollers are arranged which bear upon
the under path before mentioned, and one or more rollers affixed to the forward.
part of the jib bear upon the upper path formed on the carriage.
The travelling wheels of the carriage may be in pairs one being above and one
below the rail, or in the case of girders of channel iron the travelling wheels may
be arranged to bear between the flanges, in both cases tilting of the carriage is
avoided, and a counterbalance is dispensed with.
The various actions of the crane may be worked by hand, or they may be.
connected with a motor of any suitable description.
The jib carriage may be of any description that can be traversed from end to
end, and provided with lifting tackle for raising and lowering heavy articles.
Dated the 29th day of November 1895.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.

page_text: Improvements in Travelling Overhead Jib-cranes.
I, WILLIAM ROGER DAWE of 82 Andover Street, in the City of Sheffield
Works Manager do hereby declare the nature of this invention and in what
manner the same has to be performed, to be particularly described and ascertained
in and by the following statement :—
My invention relates to overhead or overhung travelling cranes, and has for its
object the construction of an overhead crane with jib fitted with a travelling
carriage and capable of lifting, swinging, travelling and handling a load suspended
from the end or any point of the jib; with all requisite mechanism for working
the several motions, and constructed to run upon or within a track consisting of
two girders, or upon the transverse girders of an ordinary travelling craue as an
auxiliary thereto.
I have illustrated the mechanism in the annexed drawings which are sufficient
to enable a mechanician to carry out my invention; similar letters of reference
indicate similar parts in any of the figures.
Fig. 1, represents an elevation, half in section, of my improved crane.
Fig. 2, end elevation of same, part in section.
Fig. 3, plan of same with parts in section.
In carrying out my invention in a simple form of construction such as shown in
the drawings, I make a carriage A, upon which are fixed four strong wheels or
rollers B, by which the carriage is suspended or supported upon a pair of fixed
girders or rails C, upon which the carriage is intended to travel, as for example
from one end of a shop to the other.
The travelling movement is obtained in this case by means of a loop chain
suspended upon the chain pulley D, by pulling which the gearing or intermediate
wheels E, upon the axles of two or more of the rollers B, are caused to revolve,
and thus the carriage is moved in either direction.
Although I prefer the above described arrangement of four rollers placed above
and below a rail C, as shown, the carriage may have ordinary tram wheels to run
upon the transverse girders of an ordinary travelling crane.
The lower part of the carriage forming its base, and which is marked F, is
circular as shown in Fig. 3, and is provided upon the top side and the underside
of its periphery with a roller path, the upper one marked G2, and the lower one G,
upon which the jib rollers H, and H2, travel, the rollers H, at the back end of the
jib bearing upon the under path G, and the rollers at the forward end of the jib
marked H, bearing upon the upper path G².
The jib J, is arranged to be held directly underneath the circular base F, by
means of a strong central bolt K, the lower part or head being constructed to
carry the girders J, which form the jib; the upper part passes through the central
portion of the carriage and it is sustained by means of a screwthreaded nut L,
screwed upon its correspondingly threaded end which projects from the carriage,
the under face of the nut, or an interposed washer, resting upon a circle of ball or
roller bearings M.
In Figs. 2 and 3, I have shown a safety hook marked R, which is one of a set
of four, they are secured to the base of the carriage, and are so placed that if an
accidental fracture of the carriage was to occur, the parts would be supported, by
the hooks engaging with the rails C, but they form no part of my invention.
In Fig. 3, I have indicated at P, where a clutch may be conveniently placed so
as to enable the gearing E, to be instantly thrown in and out of mesh from below
which would be useful when the travelling gear was worked by a motor.
Upon the jib I support a travelling lifting block, or any lifting device such as
that known as "Westons self sustaining block or the like, mounted upon wheels

page_text: and resting upon the lower members N, on each side of the jib, and capable of
being traversed from end to end of the jib as desired.
The various movements of the crane may be accomplished by hand, or by a
suitable motor.
It will therefore be understood, that the entire crane can be traversed from end
to end of the rails C, by which it is supported, that the jib J, can be swung round
in either direction, and that the lifting tackle with the object raised can be moved
upon the jib from one end to the other, or be supported directly under the centre
of the supporting bolt L.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. An overhead travelling jib crane, constructed as hereinbefore described and
set forth.
2. An overhead travelling jib crane, having the jib supported underneath a
circular base by means of a central bolt, and having rollers bearing upon paths
formed round the said circular base in the manner herein before described and
shown.
3. In an overhead crane the combination with a travelling carriage A, of a
circular base F, provided with roller paths G & G², and a rotating jib J, supported
under the base F, by a bolt or its equivalent K, and provided with rollers H and H2,
to travel on the said paths, and constructed to permit the lifting tackle suspended
from the jib, to be traversed from the front end back to and beyond the central
bolt K, as herein before described and set forth.
Dated the 1st day of September 1896.
ROBT. F. DRURY, C.P.A.,
Agent for Applicant.