IMPROVEMENTS IN AND RELATING TO CRANES
Year: 1885

page_text: We JAMES BROWN, of 11 Seacome Street, Liverpool in the County of Lancaster,
Engineer and THOMAS ANDREW PORTER, of 37, Chesnut Grove, Marsh Lane, Bootle
in the County of Lancaster, Advertising Contractor do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN AND RELATING TO CRANES " to be as
follows:-
•
Our Invention relates to certain improvements in Cranes and has for its object
to increase the utility of cranes by the use of an accessory appliance hereinafter
described which adds to the reach of the crane and to the height of lift.
Our Invention consists of a supplementary jib, one end of which we attach, by
a hinge connection, to the ordinary jib, the attachment being about one third from
the top of the jib. This supplementary jib is capable of an up and down movement
from the jib proper namely the outer end of the supplementary jib can be brought
down to the level of the base of the crane, or lower, if necessary for picking up, or
depositing purposes, and when raised the outer end of the supplementary jib
projects considerably above the end of the jib proper. In working, the lifting
chain of the crane passes over the sheaves of the jib proper and is connected to
about the centre of the supplementary jib. The supplementary jib may be used
for picking up and depositing by direct connection with the articles to be raised,
or lowered, or it may be provided with sheaves and supplementary hoisting tackle,
leading over sheaves on the end of the jib proper and from thence to the winding
mechanism.
In working a crane, provided with a supplementary jib according to our
Invention, if the jib is kept at its ordinary angle of elevation, the load on the
crane must be reduced, but by elevating the jib proper until the end of the
supplementary jib comes in the same line with the position the end of the jib
proper would have at its ordinary elevation, the crane may be worked to nearly its
full load.
By the use of a supplementary jib according to our Invention the capabilities of
a crane are greatly increased, inasmuch as the reach of the crane is increased and
the height of lift is considerably added to. When not in use, the supplementary
jib can be folded down and lie against the underside of the jib proper and the crane
can be used as an ordinary crane.

page_text: Improvements in and relating to Cranes.
We JAMES BROWN, of 11 Seacome Street, Liverpool, in the County of Lancaster,
Engineer and THOMAS ANDREW PORTER, of 37 Chesnut Grove, Marsh Lane, Bootle,
in the County of Lancaster, Advertising Contractor do hereby declare the nature
of the said Invention for IMPROVEMENTS IN AND RELATING TO CRANES 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 certain improvements in cranes, and has for its object
to increase the utility of cranes by the use of an accessory appliance hereinafter
described which adds to the reach of the crane and to the height of lift.
Our Invention consists, of a supplementary jib, one end of which we attach by
a hinge connection to the ordinary jib, the attachment being about one third from
the top of the jib. This supplementary jib is capable of an up and down movement
from the jib proper, namely the outer end of the supplementary jib can be brought
down to the level of the base of the crane, or lower, if necessary for picking up, or
depositing purposes, and when raised the outer end of the supplementary jib
projects considerably above the end of the jib proper. In working, the lifting
chain of the crane passes over the sheaves of the jib proper and is connected to
about the centre of the supplementary jib. The supplementary jib may be used
for picking up and depositing by direct connection with the articles to be raised,
or lowered, or it may be provided with sheaves and supplementary hoisting
tackle leading over sheaves on the end of the jib proper and from thence to the
winding mechanism.
In working a crane provided with a supplementary jib according to our
Invention, if the jib is kept at its ordinary angle of elevation the load on the
crane must be reduced, but by elevating the jib proper until the end of the
supplementary jib comes in the same line with the position the end of the jib
proper would have at its ordinary elevation, the crane may be worked to nearly
its full load.
By the use of a supplementary jib according to our Invention, the capabilities
of a crane are greatly increased, inasmuch as the reach of the crane is increased
and the height of lift is considerably added to. When not in use the supple-
mentary jib can be folded down and lie against the underside of the jib proper
and the crane can be used as an ordinary crane.
That our Invention may be more clearly understood, we have hereunto annexed
a sheet of Drawings, which make a part of this Specification and show an example
of our Invention as applied to a steam travelling crane, the Drawings being
marked with letters and figures of reference corresponding with those used in the
following explanation.
The Drawing shows a side elevation of a steam travelling crane with our
improvements applied thereto.
A is a steam travelling crane B is the ordinary jib of the crane. Our Invention
consists in providing the ordinary jib B with a supplementary jib, or radius arm C

page_text: which is attached to the ordinary jib B by a hinged connection D, which is so con-
structed that it is adjustable in vertical position from the jib proper B, so that it is
capable of being fixed at any required position on the jib proper B for example
about one third from the top of the jib proper B. The supplementary jib C is
capable of being lowered to the horizontal position shown in dotted lines, or when
not in use it can be lowered to lay alongside of the jib proper as also shown in
dotted lines. The lifting chain, or rope of the crane may be connected to the
provision a and used simply for working the supplementary jib, or radius arm C
in which case, the end of the supplementary jib C is provided with a fixed pendant
chain and hook, or other appliance for connecting with the weight to be raised, or
lowered, or the crane chains may be applied as shown in the Drawing. In this
case there are two chains and two barrels or their equivalent on the crane and
double sheaves at the head of the jib. One of these chains b is used for raising
and lowering the supplementary jib Cand the other chain d is used for raising and
lowering the weight W. The leads of these chains will be understood by referring
to the Drawing,
In ordinary cranes with a simple jib such as B the angle of the jib necessary to
obtain a given height so contracts the radius that in order for example to the
setting down of a stone in a desired position, rollers and bars, or like appliances
have to be resorted to, to complete the positioning of the stone after the crane has
deposited it. The necessity for having the jib B almost erect in confined positions
is also attended with like disadvantages. These objections are overcome by the use
of the supplementary jib, or radius arm C, which also commands a higher lift and
a greater radius than can be attained by the jib proper B, and when the supple-
mentary jib, or radius arm C is not required, the crane can be used as an ordinary
crane.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed we declare that what
we claim is :-
First. The use in connection with cranes of a supplementary jib, or radius arm,
such as C connected to the crane and operating in the manner and for the purposes
herein described and as shown in the Drawing hereto annexed, or any mere
modification thereof.
Second. The combination with a crane such as A and jib proper B of a supple-
mentary jib, or radius arm C hinged to and adjustably connected to the jib proper
as and for the purposes set forth.