Improvements in Derricks.
Year: 1898

page_text: Improvements in Derricks.
We, WALTER ERNEST HUTCHINSON, Mariner, of 55, Poets Road, Canonbury, and
ARTHUR EDWARD NEWTON, Mariner, of 16, Linthorpe Road, Stamford Hill, both
in the County of Middlesex, do hereby declare the nature of this invention to be
as follows:-
This invention relates to derricks such as are used on board ship for loading
or discharging cargoes and has for its object to enable them to swing with
greater freedom in one direction of their traverse than in the opposite direction,
advantage being taken of this difference to facilitate the conveyance of the load.
In one form of derrick constructed according to this invention and suitable
for use on board ship, the post, instead of being passed through the deck and
rigidly secured in a vertical position, as is the case with the ordinary Samson's
posts, is connected to the deck of the vessel by means of a ball and socket or other
form of universal joint so as to be capable of being inclined at any angle in any
desired direction, the plane of rotation of the derrick and its load being thereby
inclined also. The consequence of this obliquity is, that when rotating the swivel
post through half a revolution the weight of the leg and load tends to accelerate
such rotation when the end of the leg is travelling from the highest towards the
lowest point in the said plane and thus reduce the force required to turn the
derrick when loaded, the opposite conditions obtaining when returning the leg
to its initial position with its outward end ascending the plane of its rotation.
The inclination of the swivel post is controlled by means of guy ropes connected
to its upper part and which may be led through blocks to one or more winches
or other mechanical means.
1000
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
Improvements in DerriCKS.
We, WALTER ERNEST HUTCHINSON, Mariner, of 55, Poets Road, Canonbury, and
ARTHUR EDWARD NEWTON, Mariner, of 16, Linthorpe Road, Stamford Hill, both
in the County of London, 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:—
This invention relates to derricks such as are used on board ship for loading
or discharging cargoes and has for its object to enable them to swing with

page_text: greater freedom in one direction of their traverse than in the opposite direction
advantage being taken of this difference to facilitate the conveyance of the load
In a derrick constructed according to this invention and suitable for use o
board ship, the post instead of being passed through the deck and rigidly secured
in a vertical position, as is the case with the ordinary Sampson's posts, is con
nected to the deck of the vessel by means of a ball and socket or other form o
universal joint so as to be capable of being inclined at any angle in any desired
direction, the plane of rotation of the derrick and its load being thereby inclined
also. The consequence of this obliquity is, that when rotating the jib through
half a revolution the weight of the jib and load tends to accelerate such rotation
when the end of the jib is travelling from the highest towards the lowest point
in the said plane and thus reduce the force required to turn the derrick when
loaded, the opposite conditions obtaining when returning the jib to its initial
position with its outward end ascending the plane of its rotation.
In the accompanying sheet of drawings: Fig. 1 is an elevation and Fig. 2 a
plan of a derrick constructed according to this invention. Fig. 3 is a sectional
elevation to an enlarged scale of the base of a swivel post provided with a ball
and socket joint, and Fig. 4 is also an elevation of the base of a swivel post show-
ing a modified form of universal joint.
Referring to Figs. 1 to 3 the crane post a is formed with a ball b fitting in a
corresponding socket comprising a footstep e secured to the ship's deck and a
cover or cap d secured to the footstep bolts e.
crane post a are connected guy ropes f by means of which it may be secured in
To the upper extremity of the
any inclined position in order to cause the jib g of the derrick to automatically
rotate in the desired direction when loaded. The joint shown in Fig. 4 comprises
a socket h into which the lower extremity i of the crane post is fitted and whose
jaw is connected by a bolt m to an intermediate connecting block n itself con-
nected to the jaw o of the base plate p by a bolt q whose axis is perpendicular
to that of the bolt m. By these means the post a may be caused to take up a
position having any desired inclination.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In derricks in which the load is caused to automatically swing in the desired
direction by inclining the axis of rotation, a crane post having an universal
joint and capable of being inclined at any angle by means of guy ropes substan-
tially as described for the purpose set forth.
2. A derrick having a crane post terminating in a ball and socket joint, sub-
stantially as described and shown in Figs. 1 to 3 of the drawings.
3. A derrick having a crane post terminating in an universal joint arranged and 4
constructed substantially as described with reference to Fig. 4 of the drawings.
Dated this 31st day of October 1898
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.