An Improvement in Cranes.
Year: 1895

page_text: Date of Application, 12th July, 1895
Complete Specification Left, 13th Apr., 1896-Accepted, 16th May, 1896
PROVISIONAL SPECIFICATION.
An Improvement in Cranes.
I, CECIL QUIXANO HENRIQUES, of 6, Delahay Street, in the City of
Westminster, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to steam and other cranes of that kind in which the
jib has a derrick motion for the purpose of varying the effective radius of the
crane and the invention has for its object to provide means whereby the driver or
other person in charge of the crane may at all times be informed of the actual
radius of the jib for the time being and of what is the maximum load which may be
carried with safety at the various radii, the safe load varying approximately and
within certain limits in a ratio inversely as the radius.
The invention consists in the combination, with the jib, of an index moved.
thereby over a scale of which the divisions indicate in feet or other units of
length the effective radius of the crane and likewise the amounts of the maximum
loads which the crane is adapted to carry in each of the various positions of
the jib.
.
The indicator would be mounted preferably on, or near, the driver's foot plate'
or otherwise in convenient position to be seen by the person in charge and would'
preferably be worked through an adjustable coupling link jointed to the jib and to
a lever on the axis of the index, the ratio of the leverage being such as to multiply
the range of motion of the index and so enable the scale to be sufficiently large or
open as to be legible at a glance.
Dated this 10th day of Tul., 1905
:
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
I, CECIL QUIXANO HENRIQUES of 6, Delabay Street in the City of
Westminster, 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 steam and other cranes of that kind in which a derrick
motion is provided whereby to raise or lower the jib for the purpose of varying the
effective radius of the crane and the invention has for its object to provide means
whereby the driver or other person in charge of the crane may at all times be able
to ascertain accurately and at a glance the effective radius of the jib for the time
being and likewise to inform himself by reference to the crane itself of the amount
of the maximum load which may be carried with safety by that particular crane at
that or any other effective radius the safe load varying approximately and within
certain limits in a ratio inversely as the effective radius.
The invention consists in the combination, with the jib adjustable as to effective
radius by derrick motion as above mentioned, of an index moved thereby over
[ Paine RA3

page_text: a scale whereof the divisions indicate in feet or other units of length the effective
.radius of the crane in the several positions of the jib and index and likewise the
amount of the maximum load which the crane is adapted to carry in each of the
said positions.
The invention is illustrated in the accompanying drawings forming part of this
Specification wherein
Figure 1 is a diagrammatical view of a crane provided with the indicator.
Figure 2 is a front elevation and Figure 3 an end elevation of the indicator
separately.
The same letters of reference denote the same parts in all the figures.
The indicator scale A is an arc-shaped plate carried by a standard B which is
preferably mounted on the driver's foot plate or other part of the swivelling.
superstructure in such convenient position as to enable it to be always seen at a
glance by the driver or other person in charge of the crane without leaving his
post. In the standard B is mounted the shaft C of an index D whose outer end is
movable over the scale plate, this shaft being provided with a lever arm E which
is coupled by a link F to the adjustable jib G of the crane so that the index will.
always occupy a position on the scale corresponding to the then vertically angular
position and consequently to the effective radius of the jib. The jib is adjustable
about its heel pivot 9 by means of raising and lowering tackle H of the "sual kind
and the ratio of the radius of the point of connection of the link F to the jib to
the radius of the arm E is such that the angular motion of the index is a
multiple of the vertical angular adjustment of the jib so as to permit of the scale
being sufficiently large and open to be easily legible from the driver's post.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In a crane having an adjustable jib for varying the effective radius, the
combination with the jib of an indicator coupled thereto and movable thereby over
a scale denoting the effective radius and maximum load for the various positions of
adjustment of the jib substantially as specified.
Dated this 13th day of April 1896.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.