Improvements in or connected with Derrick Gear for Ships and the like.
Year: 1899

page_text: Date of Application, 24th May, 1899
Complete Specification Left, 13th Feb., 1900-Accepted, 24th Mar., 1900
IMVUVIDIONAL
Improvements in or connected with Derrick Gear for Ships
and the like.
I, WILLIAM EDWARD Moss, of 34, Ashfield, Wavertree, Liverpool, in the
County of Lancaster, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to derricks particularly applicable for use where it
is desired to employ them at a high angle for raising or lowering loads from
or to holds of ships, and to lower the derricks to a low angle so that the loads
can be suspended clear of the ship's side when the derrick is slewed round; and
the object of this invention is to provide simple appliances for raising or
lowering the derrick simultaneously with slewing it, and so obtaining rapid and
certain discharge and loading of cargo without liability of fouling the ship's
side.
To attain the above object instead of using a fixed chain or rope span from the
head of the derrick to the mast I make use of a chain or rope leading from
the head of the derrick through a block on the mast, then through another block
at the side of the ship and finally attach the end of the said chain or rope to
the derrick at any desired position in its length. In some cases according to
relative positions of derrick and mast double blocks for the chain or rope may
be used between the head of the derrick and the mast. By the above arrange-
ment when the derrick is lowered it will pull itself round to the side
of the ship, thereby obtaining a combined lowering and slewing action and
enabling the load to be swung clear of the side. To raise or control the derrick
I fasten a rope to the head of the derrick and lead such rope through a block
on a span between the masts, or on a derrick not being used, or in other con-
venient position, then lead such rope preferably through a block on the mast
and down to the deck. Double blocks may be used between the head of the
derrick and the span if desired. This said rope may be operated by or from
the ships winch or from an engine placed in any convenient position, preferably
near the foot of the mast, for raising or slewing the head of the derrick.
fov 1800

page_text: and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, reference being had to the
accompanying drawings:-
This invention relates to derricks particularly applicable for use where it
is desired to employ them at a high angle for raising or lowering loads from
or to holds of ships, and to lower the derricks to a low angle so that the loads
can be suspended clear of the ships side when the derrick is slewed round, and
the object of this invention is to provide simple appliances for raising or
lowering the derrick simultaneously with slewing it, and so obtaining rapid and
certain discharge and loading of cargo without liability of fouling the ships
side.
On the drawings Fig. 1 is a plan, and Fig. 2 an end elevation of appliances
constructed according to my invention.
of
To attain the object of the invention, instead of employing, as is usual, a fixed
chain or rope span from the head of the derrick to the mast I make use of a
chain or rope a attached to the head of the derrick band leading therefrom
through a block on the mast d then through another block e at or near the
side of the ship f and I finally attach the other end of the said chain or rope a
to the derrick at any desired position in its length such as at g. By the above
arrangement when the derrick is lowered it will pull itself round to the side
of the ship thereby obtaining a combined lowering and slewing action and
enabling a load suspended from the usual hoisting chain i to be swung clear
of the side as shown in dotted lines. According as, the point of attachment
the rope a is nearer to or farther from the head of the derrick so will more or
less lowering of the head of the derrick be required to bring such derrick head
over the side of the ship. The positions of the point g and of the block e will
be varied according to requirements. The heel of the derrick is pivotted to
the mast in the usual way. To raise, lower or control the derrick I fasten a
rope to the head of the derrick and lead such rope through a block k on a
span or stay between the mast d and the side of the ship, then lead such
rope j, preferably through a block m on the mast and then down to the deck,
or the rope may pass direct down to the deck from the block k if desired.
block may be attached to a stay or span such as arranged between two masts,
or the block may be attached to a derrick not being used, or in any other con-
venient position. The rope j may be operated for raising or slewing the head
of the derrick by means of a winding drum » driven by an engine o in any
desired way or such rope ; may be operated by a drum on, or in connection
with, the ships winch but I prefer to use a separate engine as shewn, near the
foot of the mast.
The
In some cases according to weight of load double blocks between the head of
the derrick and the stay / may be used for the rope j, as shown in Fig. 3 of
the drawings, where k, k¹, are two blocks, one, k, attached to the stay / and the
other to the derrick, the end of the rope j being attached to block and then
rove through both blocks before passing to the block on the mast. Also according
to relative positions of mast and derrick, double blocks may be used between
the mast and derrick or between the derrick and side of the ship for the rope a.
In Fig. 3, c, d, are two blocks, one, c, on the mast, and the other c¹ on the
derrick. The rope a is rove through both blocks as shewn. Fig. 4 is a view
showing the rope a rove through two blocks e, e¹, between the derrick and the
side of the ship. If found desirable double blocks may be used both between
the mast and derrick and between the derrick and side of the ship. Like
letters indicate similar parts in all the views.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
1 claim is:
The combination with a derrick of a chain oi iope led through blocks on the

page_text: mast and at or near the side of a ship or equivalent position the chain or rope
being attached by both ends, or connected through blocks, to such derrick, and
of a chain or rope attached to such derrick either direct or through a block
and led through a block on a stay or in equivalent position and then led to a
winding drum, all arranged and operating substantially as and for the purpose
set forth.
Doted this Tenth day of Webruary 1900