Improvements in Derrick Cranes for Steam and other Ships or Vessels.
Year: 1892

page_text: Date of Application, 28th Apr., 1892
Complete Specification Left, 26th Jan., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Derrick Cranes for Steam and other Ships
or Vessels.
I, PETER WILLIAM TAIT, Assistant Superintendent to Messrs. James Currie
& Co., Leith, 9 Dudley Avenue, Leith in the County of Midlothian, do hereby
declare the nature of this invention to be as follows:-
This invention which relates to derrick cranes for steam and other ships or
vessels has for its object to enable the jib of the crane to be moved athwartship
towards either side and also if desired to render the base of the jib adjustable
longitudinally towards or from the mask such adjustments rendering the derrick
more efficient in loading or unloading the vessel from or on to a quay or wharf or
from or into another vessel alongside. Under the invention the base of the jib
instead of being carried by a band secured to the mast as is usually the case is
carried by a block which is capable of movement athwart the ship on an angle iron
guide supported upon a wood or other beam which may be secured to the deck.
The block has a hole made vertically through it to receive a pin or bolt which is
jawed at its upper end the coupling eye at the base of the jib being inserted in the
said jaw and retained in position by a cross pin on which the jib is capable of
swinging through a vertical arc the movements of the jib through a horizontal arc
being provided for by the vertical pin or bolt which turns freely in the hole made
in the block. The back and the extremities of the block are so shaped as to
embrace the horizontal angle iron guide which at its ends has two brackets or lugs
wherein a horizontal screw is carried which screw has the block threaded upon it
and is capable of being rotated to shift the position of the derrick by a lever, hand
wheel or the like applied at one end.
In addition to the support of the brackets or lugs the screw may be further
supported by end plates secured to the deck or foundation of the crane by angle
irons.
The improved derrick has the advantage that it may be either fastened to the
deck or elevated on supports to any desired height and by the employment of
another screw attached to the rear of the block and of a nut carried by a band
or guide attached to the mast the base of the jib is also rendered adjustable
towards or from the mast.
Under the invention the crane may be duplicated that is to say two derricks may
be provided for one hatchway.
Dated this Twenty-seventh day of Anril 1892
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Derrick Cranes for Steam and other Ships
or Vessels.
1, PETER WILLIAM TAIT, Assistant Superintendent to Messrs. James Currie
& Co., Leith, 9 Dudley Avenue, Leith in the County of Midlothian, do hereby
declare the nature of this invention and in what manuer the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This invention which relates to derrick cranes for steam and other ships or
vessels has for its object to enable the jib of the crane to be moved athwartship

page_text: towards either side such adjustment rendering the derrick more efficient in loading
or unloading the vessel from or on to a quay or wharf or from or into another vessel
alongside.
Under the invention one modification of which is illustrated partly in elevation
and partly in vertical section by Figure 1 and in part plan by Figure 2 of the
accompanying drawings the base of the jib A instead of being carried by a band
secured to the mast as is usually the case is carried by a block B which is capable
of movement athwart the ship on a horizontal_guide C carried by an angle iron
frame D which at its ends is bolted to brackets D₁ secured to the deck or supported
upon a wood or other beam so secured. The block B has a hole made vertically
through it to receive a pin or bolt E which is jawed at its upper end the coupling
eye at the base of the jib A. being inserted in the said jaw and retained in position
by a cross pin on which the jib is capable of being swung through a vertical arc
the movements of the jib through a horizontal arc being provided for by the
vertical pin or bolt E which turns freely in the hole made in the block B. The
block is so shaped as to embrace the edges of the horizontal guide C and the angle
iron frame D or the brackets D' has or have vertical lugs F formed on or secured
to them the said lugs carrying a horizontal screw G which has the block B
threaded upon it and is capable of being rotated to shift the position of the derrick
by a lever bar hand wheel or the like applied at one or both ends. Midway of the
angle iron frame D there is bolted or otherwise secured a jaw y wherein the rear
end of another and swivel jaw to is centred on a pin or stud. The swivel jaw w
carries a pulley or block round which the hoisting and lowering chain or rope
from the winch passes to the block at the outer end of the jib A from which it
hangs downwards. The swivel jaw w enables the pulley or block to be
inclined as the jib is moved to one side or other of the centre line of the mast.
Under the invention the crane may be duplicated that is to say two derricks
may be provided for one hatchway as indicated by the plan Figure 3 and where
there are hatchways both forward and abaft of the mast a derrick or derricks may
be provided for each hatchway these being supported on separate brackets Das
shewn by the elevation Figure 4 or both may be carried by one bracket as shewn
by Figure 5. In erecting the improved derrick it is preferred that the pin or
bolt E should be in the same vertical plane as the point of attachment of the spar
chain or bar I to the mast.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In conjunction with derrick cranes for steam and other ships and vessels the
application of apparatus whereby the base of the jib nay in a horizontal plane be
moved athwartship substantially as described with reference to the drawings
annexed.
2. The combination with a derrick crane for steam and other ships or vessels of
a block carrying the swivel pin of the jib said block being carried on a guide
supported on a framing and moved athwartship by a screw on which it is threaded
substantially as described with reference to the accompanying drawings.
Dated this 25th day of January 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.