Improvements in Windlasses.
Year: 1896

page_text: Date of Application, 27th Nov., 1896
Complete Specification Left, 26th Aug., 1897- Accepted, 16th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Windlasses.
We, ANDREW COCHRANE and GEORGE COOPER, both of Grovehill Shipyard,
Beverley, in the County of York, Shipbuilders, do hereby declare the nature of
this invention to be as follows:-
This invention relates to windlasses, particularly such as are intended for use
on board ship, and is designed to enable the change from the double-purchase to
the single-purchase gear to be effected without removing or releasing from the
lower drum the warp which may be about the same.
According to the usual method of constructing small windlasses, such as steam
trawlers and similar vessels are provided with, for the purpose of getting their
anchors, for hauling ropes or warps when moving the ship, or for like services,
the upper or handle shaft is furnished with a sliding clutch for engaging with the
pinion and thus enabling the rotative motion to be communicated to the spur
wheel and warp barrel which are mounted upon the lower or double-purchase
shaft. This shaft is however usually arranged to project beyond the frames on
either side each projecting extremity being furnished with a drum and it is some-
times desired to employ these double-purchase drums for warping and other ser-
vices whilst a cable remains about the centre or main drum. Under such circum-
stances it is necessary either to remove the cable or to loop up its coils clear of the
drum.
Our invention is designed to avoid this inconvenience and to permit the use of
the outside drums pertaining to the lower or double-purchase shaft without dis-
turbing the cable which may be about the main drum or sheave.
In a windlass constructed according to our improved method, the pinion, instead
of engaging with the single-purchase or first inotion shaft through a clutch, is
fast thereon, and meshes with the spur wheel which is fast upon the lower or
double-purchase shaft. The outside drums pertaining to the latter shaft are there-
fore always in an operative condition.
The main drum or sheave mounted upon the lower or double-purchase shaft is,
however, loose thereon and is brought into operative connection therewith through
a clutch which may be readily thrown out of gear when the main drum or sheave
is occupied by a warp which for the time being, is not in use. The outside drums
pertaining to the upper or single purchase shaft are at the same time available for
use, as under ordinary circumstances.
We usually prefer to replace the main warp barrel upon the double-purchase
shaft by a chain sheave furnished with a drum and friction strap, as also with a
circular rack and pawl; the former for enabling the chain sheave to be held
stationary, and the latter for preventing its rotation in the reverse direction.
This modification admits moreover of the width of the windlass being reduced.
Dated this 23rd don of Vanambo 1000

page_text: We, ANDREW COCHRANE and GEORGE COOPER, both of Grovehill Shipyard,
Beverley, in the County of York, Shipbuilders, 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 windlasses, particularly such as are intended for use 5
on board ship, and is designed to enable the change from the double-purchase to
the single-purchase gear to be effected without removing or releasing from the
lower drum the warp which may be about the same.
According to the usual method of constructing small windlasses, such as are
provided on steam trawlers and similar vessels, for the purpose of getting their 1
anchors, for hauling ropes or warps when moving the vessel or for like services, the
upper or handle shaft is furnished with a sliding clutch for engaging with the
pinion and thus enabling the rotative motion to be communicated to the spur
wheel and warp barrel which are mounted upon the lower or double-purchase
shaft. This shaft is, however, usually arranged to project beyond the frames on
either side, each projecting extremity being furnished with a drum, and it is some-
times desired to employ these double-purchase drums for warping and other services
whilst a cable remains about the centre or main drum. Under such circumstances,
it is necessary either to remove the cable from the main drum or to loop up its
coils clear of the drum.
Our invention is designed to avoid this inconvenience, and to permit the use of
the outside drums, pertaining to the lower or double-purchase shaft, without dis-
turbing the cable which may be about the main drum or sheave.
In a windlass constructed according to our improved method, and which is
illustrated in the accompanying drawing, the pinion a, instead of engaging with
the single-purchase or first motion shaft b through a clutch, is fast thereon, and
meshes with the spur wheel e which is fast upon the lower or double-purchase
shaft d. The outside drums e e pertaining to the latter shaft are therefore always
in an operative condition. The main drum or sheave f, mounted upon the lower
or double-purchase shaft d, is, however, loose thereon, and is brought into opera-
tive connection therewith through a sliding clutch g which may be readily thrown
out of gear when the main drum or sheave is occupied by a warp which, for the
time being, is not in use. The outside drums h h pertaining to the upper or single-
purchase shaft b are at the same time available for use, as under ordinary circum-
stances.
We usually prefer to replace the main warp barrel upon the double-purchase
shaft d by a chain-sheave, as illustrated in the drawing, same being furnished
with a drum f and friction-strap f, as also with a circular rack and pawl
(not shown); the rack for enabling the chain-sheave f to be held stationary, and
the pawl for preventing its rotation in the reverse direction. This modification
An ordinary
admits moreover of the width of the windlass being reduced.
barrel may, however, be used instead of the chain-sheave.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we claim :-
1. The improved construction of windlass substantially as herein described, and
whereby the outside drums are rendered available for warping purposes without
disturbing the cable on the main barrel.
2. The improved windlass, constructed substantially as described with reference

page_text: to the accompanying drawing and wherein the single-purchase pinion is fast on
the upper shaft and the barrel or chain-sheave is mounted loosely on, and is
capable of being brought into operative connection with, the lower shaft.
3. In a windlass, the employment of a loosely mounted chain-sheave furnished
with a drum and friction-strap and with a rack and pawl, substantially as and for
the purposes set forth.
4. In a windlass, the combination, with the lower shaft d, of a chain-sheave f,
loosely mounted thereon, and a sliding clutch g, substantially as and for the pur-
poses set forth.
For the Applicants,
G. G. W. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.