IMPROVEMENTS IN CABLE HOLDERS OR RIMS."
Year: 1879

page_text: T
LETTERS PATENT to James Mitchell, of 48, Gordon Street, Glasgow, and
Diggory John Cocks, of 48, Gordon Street, Glasgow, for the Invention of
"IMPROVEMENTS IN CABLE HOLDERS OR RIMS."
PROVISIONAL SPECIFICATION left by the said James Mitchell and Diggory
John Cocks at the Office of the Commissioners of Patents on the 25th July
: 1879.
JAMES MITCHELL, of 48, Gordon Street, Glasgow, and DIGGORY JOHN COCKS, of
48, Gordon Street, Glasgow. "IMPROVEMENTS IN CABLE HOLDERS OR RIMS."
This Invention of improvements in cable holders or rims relates to the danger of
chain cables slipping and surging as they do in the usual kind with fixed studs or stops,
the present Invention acting differently and having the studs moving while working.
To do this there are two discs or surfaces with strips or rails radiating from the
centre, forming slides or grooves for the stops or studs of the cable holder to work
freely in. The two flanges are fitted on a boss or centre through which the spindle
of the windlass or capstan passes. On this boss are two eccentrics, on these eccen-
trics are two rings; on the outer side of these rings are eyes or lugs, to which are
attached the studs or stops which slide in the grooves. On the outside end of the
boss is fitted a lever or other arrangement for reversing the full part of the eccen-
trics to or from the top or side of the wheel where the chain works. This lever is
fixed when the wheel is actuated on by the motive power. When the wheel revolves
the eccentrics are kept in their position by the lever, thus causing the sliding studs
or stops to radiate to or from the centre, taking hold and releasing their grip of the
chain as the same is brought in and paid away in the ordinary way. By this action
of the studs the chain is fleeted without slip or surge, and different sizes of changes
can be worked in the same wheel by altering the position of the lever so as to
shorten or lengthen the stroke of the sliding studs. When the cable is to be let go
by the reversing of the lever the stud being brought inside the working diameter
of the chain allows it to run out freely.
:
This Invention can be applied with any motive power, the novel and peculiar
action being that the moving studs or stops have control over the cables of different
sizes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Mitchell and Diggory John Cocks in the Great Seal Patent
Office on the 24th January 1880.
JAMES MITCHELL, of 48, Gordon Street, Glasgow, and DIGGORY JOHN COCKS, of
48, Gordon Street, Glasgow. "IMPROVEMENTS IN CABLE HOLDERS OR RIMS."
This Invention of improvements in cable holders or rims relates to the danger of
chain cables or chains slipping and surging as they do in the usual kind of cable
holders, rims, or chain wheels with fixed studs or stops when running over cable
holders or chain wheels or pulleys, the present Invention acting differently and
having the studs moving while working. To do this there are two discs or surfaces
attached together by bolts, with skips or rails radiating from the centre, forming
slides or grooves for the stops or studs of the cable holder to work freely in. The
two flanges are fitted on a boss or centre through which the spindle of the windlass
or capstan passes. On this boss are two eccentrics, on the eccentrics are two rings;
on the outer side of these rings are eyes or lugs to which are attached the studs or
stops which slide in the grooves. On the outside end of the boss is fitted a lever or
other arrangement for reversing the full part of the eccentrics to or from the top or
side of the wheel where the chain works. This lever is fixed when the wheel is
actuated by the motive power. When the wheel revolves the eccentrics are kept
in their position by the lever, thus causing the sliding studs or stops to radiate to
or from the centre, taking hold and releasing their grip of the chain as the same is
brought in and paid away in the ordinary manner.
By this action of the studs the chain is fleeted without slip or surge, and different
sizes of chains can be worked in the same wheel by altering the position of the
lever so as to shorten or lengthen the stroke of the sliding studs. When the cable
is to be let go by the reversing of the lever the studs are brought inside the working
diameter of the chain and thus the chain can run out freely.
This Invention can be applied with any motive power, the novel and peculiar
action being that the moving studs or stops have control over the cables of different
sizes from acting partially on a part of the circumference of the wheel only, and
therefore the pitch or exact make of the chain or cable is not of so much conse-
quence; whereas in cable holders or wheels with flxed studs or stops there has
always been a difficulty and danger, even the wear of the chain altering the pitch
and causing the cable to surge or ride. The longer or shorter links are held by this
improvement from the compensating action of the cam or eccentric. As the
mechanism of the wheel adapts itself to various sized chains it is evident that
it can be applied to a variety of chain wheels, such as pulleys or winding gear
where chains are used.
In the Drawings shewing different modifications, the like parts being described
by like letters, they are shewn as follows:-
a, the studs, tops, or whelps, moved by pins, studs, or loops in connection with
the eccentric; b, the eccentrics; c, the discs; d, the lever of the eccentric; e, the
grooves for the stops; f, the shaft; g, the eccentric ring; h, the stops to work in
the eccentric rings; a*, double whelps, the loops of each formed so that all shall
form when put together, the thickness to come within the total width of the
whelp.
The working of the machine is thus:-The whelps or stops are elevated at the part
where the rim should hold the chain, then as the chain should be released the
whelp by the action of the eccentric retires towards the axle and releases the chain;
the position of the eccentric regulates the point or part of the disc where the whelps
are desired to be protruded. The action of the whelps may be obtained by the
eccentric being grooved, in which pins of the whelps work, or loops may be formed
on the whelp, or the whelps may be in pairs coupled by a loop, within which an
eccentric may act, or a series of cams may be employed to make the whelps recede

page_text: or protrude, but we prefer the method shewn with the double whelp and pins
working in an eccentric groove.
Having now described and particularly set forth the nature of the said Inven-
tion, and the manner of carrying the same into effect, we would have it understood
that we claim in cable holders or rims for chain wheels the moveable studs or stops,
or whelps, actuated by eccentrics or cams whilst the wheel is revolving, substantially
as described.
In witness whereof, we, the said James Mitchell and Diggory John Cocks
have hereunto set our hands and seals, this Twenty second day of January,
in the year of our Lord One thousand eight hundred and eighty.