Improvements in and relating to Chain Stoppers.
Year: 1893

page_text: Date of Application, 31st May, 1893
Complete Specification Left, 15th Feb., 1894-Accepted, 24th Mar., 1894
PROVISIONAL
SPECIFICATION,
Improvements in and relating to Chain Stoppers.
We, THOMAS MAXWELL GRANT and ALEXANDER KELLY both of the Firm of
Napier Brothers Limited Engineers 100 Hydepark Street Glasgow, Lanarkshire,
do hereby declare the nature of our invention to be as follows:-
This invention has reference to and comprises a new or improved mode and
means or appliance susceptible of considerable modification for stopping or locking
cable and other chains, on ships, docks, or harbours, and especially the anchor
cables on board ship whereby these chains will be stopped or locked in a more
simple and efficient manner than heretofore.
Under one arrangement as applied to cable chains on board ship, the improve-
ments consist in mounting a lower grooved pulley or roller on which the cable
chain rolls out between the cheeks of the stopper frame and in mounting an eccentric
with its axis nearly over that of the lower roller in both cheeks of the frame and
with a pin or cross spindle between these, with a loose sleeve or pulley, or it might
be a grooved pulley mounted on said spindle. This spindle has a crank or eccentric
action on the axis of the eccentrics, and a long hand operated lever is mounted on
the eccentric and spindle centre, and the weight of this lever keeps the crank
spindle and roller to act on the top of the chain over the grooved carrying roller
below. When the windlass is made to draw in the chain, the crank spindle and
antifriction roller and lever automatically rise, but on stopping the drawing in of
the chain the antifriction roller and lever automatically fall, and lock the chain
between the vertical edge links, and stop and lock it from going further out with
That is the antifriction roller or
the strain on the "payed out" cable and anchor.
eccentric or crank spindle is so proportioned as to grip the chain in this manner
between the axis of the eccentric and the grooved pulley below the chain.
operating lever would or may have a locking arrangement attached to it, such
as a quadrant with pin or loose lever, which when inserted or allowed to fall
respectively would prevent the hand lever from rising even in pulling in the chain
until removed.
The
Under another arrangement the crank spindle with the rolling pin or pulley over
the chain might be made as duplex cranks turning on crank centres or axis on the
frame cheeks, with the lever mounted outside on one of the crank axis. Or
otherwise instead of making the cross eccentric spindle to carry an eccentric sleeve
or roller riding over the chain, it might be made in the form of a crank cam with
groove in the centre for allowing the vertical edge links to pass a certain distance
through, but grip them before they came to the vertical position over the groove
carrying pulley below.
1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.

page_text: COMILIE DIECITICATION.
Improvements in and relating to Chain Stoppers.
We, THOMAS MAXWELL GRANT, and ALEXANDER KELLY, both of the Firm of
Napier Brothers, Limited, Engineers, 100 Hydepark Street, Glasgow, Lanarkshire,
do hereby declare the nature of our invention, and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement in writing, that is to say :-
This invention has reference to and comprises a new or improved mode and
means, or appliance, susceptible of considerable modification, for stopping or locking
cable and other chains, on ships, docks, or harbours, and especially the anchor
cables on board ship, whereby these chains will be stopped or locked in a more
simple and efficient manner than heretofore.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood we have hereunto
appended an explanatory sheet of drawings in which the same reference letters are
used to indicate corresponding parts in all the figures where shown.
Figure is an elevation showing one arrangement of our improved chain
stopper; and
Figures 2 and 3 are an elevation and plan view respectively of a slightly
modified arrangement in which the eccentric organ is mounted in the stopper frame
below the cable chain, instead of above it as in Figure 1.
Figures 4, 5 and 6, 7 represent elevation and plan views of two other arrange-
ments of our improved chain stoppers in which the construction of the eccentric
acting organ is modified from that shown in Figures 1 to 3.
Referring to these drawings:-Under one arrangement as applied to cable chains
on board ship, the improvements consist, as shown in Figure 1, in mounting a
lower grooved pulley or roller a on which the cable chain & rolls out between the
cheeks A of the stopper frame; and in mounting an eccentric 6 with its axis
nearly over that of the lower roller a in both cheeks A of the frame, and with a
pin or cross spindle & between these, with a loose sleeve or pulley c or it might be
a grooved pulley mounted on said spindle . This spindle has a crank or
eccentric action on the axis of the eccentric b, and a long hand operated lever d
is mounted and secured by pins at d¹d on the eccentric and the weight of
this lever d keeps the crank spindle and roller c to act on the top of the
chain Cover the grooved carrying roller a below. When the windlass is made
to draw in the chain, the crank spindle and antifriction roller c and lever d
automatically rise, but on stopping the drawing in of the chain C the antifriction
roller c and lever d automatically fall, and lock the chain C between the vertical
edge links, and stop it from going further out with the strain on the "payed out
cable and anchor. That is the antifriction roller c or eccentric on crank spindle b
is so proportioned as to grip the chain C in this manner between the axis of the
eccentric and the grooved pulley e below the chain C. The operating lever d
would or may have a locking arrangement attached to it, such as a chain e with
a portable or removable pin e entering a hole or recess in the cheek frame A, or it
might be a quadrant with pin or loose lever, which when inserted or allowed to fall
respectively would prevent the hand lever d from rising even in pulling in the
chain Cuntil removed.
"
In the modification, shown in Figures 2 and 3, the arrangement is reversed the
eccentric and its connections being mounted on the under side of the chain
cable C instead of above it as in Figure 1, and the roller a is mounted above the
cable, and an additional guide roller a is shown as mounted in the frame A below
the cable chain C.

page_text: Or
Under another arrangement, as shown in Figures 4 and 5, the crank spindle with
the rolling pin or pulley cover the chain C might be made as duplex cranks 6', b³,
with a transverse pin and turning by crank centres or axes b', b¹, on the frame
cheeks A, A, with the lever d mounted outside on one of the crank axes b¹.
otherwise instead of making the cross eccentric spindle b¹ to carry an eccentric
sleeve or roller c riding over the chain C it might, as shown in Figures 6 and 7,
be made in the form of a crank cam c¹ carried by end journals b¹ with groove c³ in
the centre of cam c' for allowing the vertical edge links C to pass a certain
distance through, but grip them before they came to the vertical position over the
groove carrying pulley a below. Instead of the eccentric organs and rollers being
placed vertically they may be placed horizontally and so take up less space with
their housings.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
First. The method of stopping or locking cable and other chains consisting in
using an eccentric acting roller, cam or equivalent organ to press the chain between
it and a roller or stop, substantially as herein described in reference to and by way
of application shown in the accompanying drawings.
Second. The combination of an eccentric acting roller, cam, or equivalent organ
operated by a hand lever, a guide or locking roller, and a carrying frame or
housing, to form a chain stopper, substantially as set forth.
AL
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.