An Improved Coil Clutch and Brake for Winding and Hauling Engines.
Year: 1895

page_text: Date of Applica'ion, 14th May, 1895
Complete Specification Left, 13th Feb., 1896-Accepted, 2nd May, 1898
PROVISIONAL SPECIFICATION.
An Improved Coil Clutch and Brake for Winding and Hauling
Engines.
I, WILLIAM HENRY LINDSAY, of Ashton Gate, Bristol, Engineer, do hereby
declare the nature of this invention to be as follows
This invention consists in an improved coil clutch for winding and hauling
engines used in connection with collieries and other mines.
The improved coil clutch and brake in which this invention consists is constructed,
arranged and operated as follows
Surrounding a bush keyed on the winding drum shaft is a coil of steel or other
suitable metal This coil tapers from a central head equally, or approximately
equally, in both directions and thus may be described as having two tails.
The head of the coil engages in a recess provided for it in a block cast in one piece
with or bolted or otherwise secured to the boss of the dium and extending inwards
from the inside thereof. The tails of the coil are each adjustably connected
through nu intervening link to a lever from which a rod counected to the said
lever is extended to a sleeve of the usual hind free to be moved by means of a
handle or the like axially along the drum shaft. The links aforesaid are furnished
with buffer springs for cushioning the eflect of putting the clutch into and out of
gear.
Under one arrangement, if the sleeve be moved towards the drum, the lover
connected to the coil tails acts upon the coil and causes it to contract throughout
its whole length and thus to bind on the bush. The winding drum then rotates
with the shaft. If, now, the sleeve be moved away from the drum, the coil is
elaxed to an extent depending on the amount of movement of the handle and the
coil thus acts as a brake on the bush which, with the drum shaft, evolves within
the coil.
If the coil be sufficiently relaxed the clutch is put out of gear and the drumm
ceases to rotate.
Great nicety of control in winding and unwinding of the dium is obtained and
the clutch serves as a brake without necessitating reversing of the engine in
lowering.
The action of the coil in its functions as a clutch and as a brake is the same
independently of change of direction of motion of the drum shaft
Instead of the arrangement above set forth whereby the coil is caused to grip
by moving the sleeve towards the drum and to relax by withdrawal of the sleeve
away from the drum, a converse arrangement may be employed.
Iustend of using one coil with two tails, two coils may be employed connected
together at the heads.
Dated this 11th day of May 1895.
NICHOLAS WATTS,
Bristol, Chartered Patent Ageut.

page_text: An Improved Coil Clutch and Brake for Winding and Hauling
Engines.
1, WILLIAM HENRY LINDSAY, of Ashton Gate, Bristol, Engineer, do hereby
declare the nature of this invention and what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement: -
This invention consists in on improved coil clutch for winding and hauling
engines such as are used in connection with collieries and other mines
The improved coil clutch and brake in which this invention consists is constructed,
arranged and operated as follows.
Surrounding a bush keyed on the winding drum shaft is a coil of steel or other
suitable metal. This coil tapers from a central head equally, or approximately equally
in both directions and thus has two tails. The head of the coil engages in a iccess
provided for it in a block cast in one piece with or bolted or other wise secured to
the boss of the drum and extending inwards froin the inside thereof. The tails of
the coil are each adjustably connected through an intervening link to a lever from
which a rod connected to the said level 19 extended to a sleeve of the usual hind
free to be moved, by means of a handle, or the like, axially along the drum shaft.
The hink aforesaid 18 furnished with buffer springs for cushioning the effect of
putting the clutch into and out of genr.
Under one arrangement, if the sleeve be moved towards the drum, the lever
connected to the coil tail acts upon the coil and causes it to contract throughout
its whole length and thus to bind on the bush. The winding drum then rotates with
the shaft. If, now, the sleeve be moved away from the dium, the coil 18 relaxed
to an extent depending on the amount of movement of the handle, and the coil
thus acts as a brake on the bush which, with the drum shaft, revolves within
the coil.
If the coil be sufficiently relaxed the clutch is put out of action, and the drum
ceases to rotate.
Great nicety of control in winding and unwinding of the drum 18 obtained and
the clutch serves as a biake without necessitating reversing of the cugine in
lowering.
The action of the coil in its functions as a clutch and as a brake is the same
independently of change of direction of motion of the drum shaft.
Instead of the arrangement above set forth whereby the coil 18 caused to grip by
moving the sleeve towards the drum and to relax by withdrawal of the sleeve away
from the drum, a converse arrangement may be employed.
Instead of using once coil with two tails, two coils may be employed connected
together at the beads.
In the accompanying diawings,
Fig. 1 represents in section, a drum a of a winding or hauling engine, the dium
being fitted with a coil clutch as arranged in accordance with this invention.
Fig. 2 18 an underside plan as seen from below the winding drum a.
Fig. 3 is a transverse vertical section on the line, x, Fig. 1.
The coil b, which preferably consists of one piece of steel or other suitablo metal
throughout but which may be made in links properly connected, or may be a wire
rope, surrounds a bush keyed on the winding druin shaft d. The coil b tapers,
from a central head b, in opposite directions and has, accordingly, two small ends
or tails. The head b' engages in a recess provided for it in a saddle e bolted or
otherwise secured to the drum a.
A link pivetted in a bracket f' bolted to the drum acts, through the screws,
upon the two tails of the coil b. The screws f' are for taking up slack in the

page_text: coil due to wear or other cause
2
An arm is connected at one end to the link f
and, towards the other end, to a rod connected to a sleeve loose on the dium
shaft d on which the sleeve is free to be moved axially by means of the 1oching
shaft. Movement of the sleeve towards the dium a causes the coil b, acted
upon at the tails by the link f through the screws f, to contract on the bush a
which, puor to being thus bound, rotates within the coil b. Binding of the coil bon
the bush e causes the drum a, previously stationary, to rotate with the shaft d and
in the same direction.
By moving the sleeve outwards on the shaft d, the coil bis relaxed to a degree
which is under control, and hence the coil serves as a biake governing the drum a
in lowering or unwinding. The link may be fitted with buffer springs for
cushioning the effect of putting the coil into and out of binding action, or the
springs may be arranged to hold the coil in or out of bind as may be required
Instead of using one coil such as b, two coils may be employed, encli tapering
fiom a head to a tail, the heads being secured together midway along the bush c;
on the two separate coils may be placed with the tails meeting midway on the bush.
Obviously the employment of bushes may in some cases be dispensed with and
the coil or coils wrapped directly round the shaft. In cases where the loads are
heavy and the driving slow, the coil is not tapered, but is preferably of uniform
section throughout.
Having now particularly described and ascertained the nature of my said inver-
tion, and in what manner the same is to be performed, I declare that what I
claim 18-
In winding, hauling and like engines; a coil clutch and brake consisting of a
metallic coil such as b, (or more than one such coil) either tapering equally from
a central head in opposite directions or of uniform sectiou throughout; the said
coil being held at the head to the winding of hauling drum and wrapped around a
bush keyed on the drum shaft, or around the shaft itself, and the tails of the coil
being arranged to be acted upon by wear- and slack-adjusting screws such as ³, or
the like, through a rocking link such as supported on a bracket such as fixed
to the drum, said link being connected to a sleeve such as free to move towards
and away from the coil and so to cause the coil to bind upon the bush, or to relax
its grip thereof, according to the direction in which the sleeve is moved axially on
the shalt, substantially as herein before described with reference to the accompanying
drawings.
Dated this 11th day of February 1896.
NICHOLAS WATTS,
Bristol, Chartered Patent Agent.