Improvement in Derrick Swinging Gear.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvement in Derrick Swinging Gear.
I, WILLIAM HENRY WISE, of 8, Grenville Terrace, West Hartlepool, without
calling, do hereby declare the nature of this invention to be as follows:-
This invention relates to the metrical variation required in the guys of derricks
swinging in the line of a circle. The invention consists essentially in separating
that part of the guys which is to be attached to the motor, whether the part be
endless or its ends be wound around drums. In the bight of the part is a sheave
or block fixed at such distance from the motor as to hold the part extended and
taut. The side parts of the guys are then attached to the separated part.
Dated this 25th day of Var 1899
I, WILLIAM HENRY WISE, of 8, Grenville Terrace, West Hartlepool, without
calling, 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 the metrical variation required in the guys of derricks
swinging in the line of a circle.
The invention consists essentially in separating that part of the guys which is
to be attached to the motor, whether the part be endless or its ends be wound
around drums.
In the bight of the part is a sheave or block fixed at such distance from the
motor as to hold the part extended and taut.
The side parts of the guys are then attached to the separated part.
In performing this invention I separate that part of the guys which is to be
attached to the motor in such manner as to eliminate the variation from the
separated or working part.
For the separated part I use an endless chain, which is passed under one gipsy
wheel and over another wheel or sheave in a block.
I fix the upper block at such distance from the motor gipsy wheel as to hold
the endless chain extended and taut.
I attach the ends of the side parts of the guys to the endless chain, or it may be
a rope, one side low down and the other high up.
As one goes up the other comes down.

page_text: The lead is through blocks high on the mast, thence through blocks on the
derrick end, thence, the one guy is passed outside the rigging to a point beyond
the mast, where it is belayed; the other guy is belayed as usual to the ship's side.
The variation being in such manner confined to the side parts of the guys I
take it up by making these guys wholly or in part of an elastic material such as
coir rope.
An alternative is to work a separate, single guy around a barrel and the
return is effected by hanging the derrick out of plumb with its lower pivot. This
is done by shackling the derrick span to either arm of crosstrees fixed athwart
upon the mast. The variation is taken up by the barrel.
Referring to the drawing, M is a mast or upright derrick post, attached to
which is a derrick K required to be swung in the line of a circle by the means
of guys which are marked C, C.
These cross the circle at varied angles and require variation of their length
as the derrick reaches different points on the circle. An endless chain or
rope A, A is a separated part of the guys and passes under and over the gipsy
wheels or block sheaves B, B. The standard S represents any reversing motor
that may be used to rotate the lower wheel B. The upper block B is attached
to the mast and holds the separated part A, A extended and taut.
The part A. A, being separated, is without variation of length and may con-
sequently be operated by a motor.
Variation is confined to those parts of the guys marked C, C, which are attached
to the endless chain at the points D, D.
On the mast M are pulleys X, X through which the guys C, C pass across to
pulleys Z, Zupon the derrick end, thence one of the guys C is passed outside of
the rigging, to a point beyond the mast, where it is belayed; the other guy C is
belayed as usual to the ship's side.
The positions of these guys C; C are reversible for delivery from the derrick
at either side of a ship.
E indicates the lead from blocks on the mast across to blocks on the derrick
end.
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
I claim is:
-
Apparatus for counteracting variation in derrick guys, substantially as set
forth.
Dated this 21st day of February 1900.