or Improved Form of Winding Drum for Winches and Cranes.
Year: 1899

page_text: Date of Application, 3rd Nov., 1899
Complete Specification Left, 30th July, 1900-Accepted, 13th Oct., 190G
PROVISIONAL SPECIFICATION
New or Improved Form of Winding Drum for Winches and Cranes.
I, JAMES PRICE, of 9, Sapps Quay, Cork, Ireland, Civil Engineer do hereby
declare the nature of this invention to be as follows:-
This invention has reference to a method of construction of winding drums
of winches or cranes so as to enable two ropes or chains being worked by the
same machinery to work tipping_buckets, double chain dipper dredgers and to
discharge or load ships cargoes. In carrying out my invention I propose to con-
struct the drum in two parts turning on the same shaft-the first part being
connected by ordinary gearing with the source of power--the second part being
free to turn within certain limits; but controled by a brake. These two parts
to be connected by a trigger fastened by a stud in the end of one part in such a
way as to allow a spur on the moving end of this trigger to run in a spiral
groove cut in the adjacent end of the other part of the drum for one or more
turns till checked by the ends of this groove, thus allowing the first part of
the drum to make one or more revolutions before the second moves.
Dated this Twenty-first day of November 1899.
I, JAMES PRICE, of 9, Sapps Quay, Cork, Ireland, Civil Engineer do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
1
This invention has reference to a method of construction of winding drums
of winches and cranes so as to enable two ropes or chains being worked by the
same machinery to work tipping buckets, double chain dipper dredgers and to
discharge or load ships cargoes. The nature and operation of my invention
will be readily understood by referring to the accompanying sheet of drawings,
which form part of this specification.
Fig. 1 represents a view of the inner end of one drum, Fig. 2 is a sectional
view of the two drums, Fig. 3 is a view of the inner end of the other drum
Fig. 4 is a sectional view of the connecting trigger between the drums. Similar
letters of reference indicate corresponding parts in each view.
A, and B, are two drums working on the main shaft S, of the winch or crane,
B is connected with the source of power by the spur wheel G at one end. Both
drums are controled by brakes working in the brake grooves E, and F. On
the inner end of the drum A, there is a spiral groove C. On the inner end of

page_text: the drum B, there is a recessed chamber in which the trigger T, is fastened by
the stud P, on which it is free to turn. The projection Q, at the other end of
the trigger travels in the spiral groove C, when the two drums A, and B, are
in position on the main shaft S; thus the two drums are only linked together
when the projection Q, is at either end of the spiral groove C, so that when the
motion of the drum B, is reversed it can make three revolutions before it again
is linked on to the drum A, by the trigger T.
To the drum B, the lifting rope or chain of a dipper dredger or tipping bucket
is attached, to the drum A, the opening rope or chain of the same.
The action is as follows, when lifting both ropes or chains are tight, Q, being
at one end of the groove C, the drums thus turning together; when the desired
height is attained the brake is applied to the drum A, and the drum B, is either
reversed or thrown out of gear, and runs back three revolutions slacking the
lifting rope or chain the dipper dredger or tipping bucket is so discharged.
The dipper dredger is then lowered open by easing the brake on the drum A, or
the tipping bucket is lowered similarly upside down or righted on its way by
using the brake on the drum B.
The number of turns of the spiral C, depends on the nature of the work to be
done, generally it should be as many as can be placed on the end of the drum
conveniently, stops being fixed in the groove to reduce the number of revolutions
of the trigger spur Q, may make according to the work required. Modification
are possible without altering the main features of my invention.
The spiral groove may take the form of a screw thread on one end of the
drum A, the trigger being carried on a casing projecting from the drum B.
The groove may be made on the outer end of the drum A, the drum B, being
keyed to the shaft S, and the trigger T, being carried on an arm or disc keyed
on the same shaft outside the drum A.
Both drums may be provided with spur wheels so that either rope or chain
may be used for lifting, and the other for tipping or opening.
The length of the drum B, may be increased and the length of the drum A,
diminished till A, takes the form of a disc attached to a spur wheel, which
works into a similar spur wheel attached to another drum provided with a brake
running on a shaft parallel to the main shaft.
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:-
First. The spiral groove combined with the trigger one end of which is fixed
and the other end free to move in the groove so as to give freedom between the
drums to the required extent.
Second. The use and application of this apparatus to the working of double
chain dipper dredgers, tipping or opening buckets, and the movement of loads
where vertical and horizontal directions of motion are required.