Improvements in Capstans and similar Winding Gear.
Year: 1899

page_text: .
winding Gear.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of
London, Electrical Engineer, and THOMAS HUMPAGE and HERBERT INNES JACQUES,
both of Luckwell Works, Ashton Gate, Bristol, Engineers, do hereby declare
the nature of this invention to be as follows:-
.
This invention relates to certain improvements in capstans and similar winding.
gear..
In carrying out the invention we employ an electric motor for operating the
capstan or the like which renders it necessary of course to employ a reducing or
differential gear as the revolutions of the motor shaft would otherwise be too
rapid. It is therefore proposed where a high speed motor is employed-and such
a motor has considerable advantages-to use a differential gear preferably the
gear described in the Specification of Letters Patent No. 20,542 of 1892.
To this end we place the reduction gear preferably between the motor and the
capstan bollard or like part (connecting the parts by suitable shafts) and form
what is called the fulcrum wheel in the gear in question with preferably a drum
shaped exterior surface on which may work a band forming a brake so that when
the lever or the like of such brake is put into a position to cause the band to
hold on the drum the gear is capable, of transmitting motion but when the
brake is released the fulcrum wheel will revolve freely on its shaft which shaft
carries the bollard, or head. In place of a band working on a drum surface the
fulcrum wheel may be held in any suitable way preferably frictional to allow
of slipping when the load is excessive.
We may mount the shaft of the bollard in ball bearings and also mount the
first driving gear wheel of the reduction gear on similar bearings, to enable
it to work easily and to reduce the friction caused by the weight of the bollard.
Dated the 3rd day of May 1899
PHILIP. M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicants.
COMPLETE SPECIFICATION.
Improvements in Capstans and similar Winding Gear.
We, JOHN CHARLES HOWELL, of 24, Queen Victoria Street, in the City of
London, Electrical Engineer, and THOMAS HUMPAGE and HERBERT INNES JACQUES,
both of Luckwell Works, Ashton Gate, Bristol, Engineers, 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 certain improvements in capstans and similar winding
gear.
In carrying out the invention we employ an electric motor for operating the
capstan or the like which renders it necessary of course to employ a reducing or
differential gear as the revolutions of the motor shaft would otherwise be too
[Price 8d1

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rapid. It is therefore proposed where a high speed motor is employed-and such
a motor has considerable advantages-to use a differential gear preferably the
gear described in the Specification of Letters Patent No. 20,542 of 1892.
The arrangement in connection with a vertical capstan as illustrated in the
accompanying drawing in which
Fig. 1 is a sectional elevation of same.
Fig. 2 is a plan and
Fig. 3 is a sectional detail view shewing the gear and case.
In this arrangement the reduction gear is carried in a casing a above the
motor b and is driven by the fast running shaft of same. The gearing in such
case consists of a bevel gear wheel e carried by the shaft of this motor and
driving a bevel gear revolving freely on a spindle e carried at an angle by a
spindle which can rotate freely in bearings in the end of the fast running
shaft and in the end of the slow-running shaft g of the capstan head. The
bevel gear also carries a bevel gear h which is attached to it or formed in
one therewith and such gear engages with a bevel gear i secured to shaft g
while the gear d engages with a bevel gear j attached to or formed on the inside
of the cover plate of casing a, which is capable of rotation. The parts E D
and H are duplicated to give a better balance to the gear. The casing prefer-
ably forms an oil receptacle. The shaft g is attached to the bollard or capstan
head which is supported preferably on ball bearings m on a fixed part n
forming a portion of the cover o of the box p containing the gear and motor.
A sleeve a surrounds the shaft g inside the part to guide and act as a bearing
for same.
The gear casing a is surrounded by a brake band or as shewn by two brake
shoes one end of each of which carries a bent lever or crank u pivoted at ss
to a frame surrounding the casing a which frame is attached to the cover o
and carries the motor b. The free ends of the two levers s s are connected by a
bolt passing freely through them which bolt carries a spring w under com-
pression. The other ends of the shoes are connected to the opposite end of
a short lever carrying a central pin y which is bolted to a lever z capable of
being acted on by a foot plunger in the cover o so that when lever is rocked
the shoes will be brought nearer together or vice versa. In operation when the
brake holds the casing a the power is transmitted through gears. c d and h to
gear i on shaft the wheel being stationary and acting as what is called the
fulcrum wheel in this gear but as soon as the brake is taken off the casing and
gear will be free to rotate and the gear i will not be driven.
The arrangement of the brake shoes allows a pressure to be put upon the casing
to hold it up to a certain point but the spring we will be compressed by the levers u
with a greater pressure and hence the shoes r r will open and allow the casing
to slip which it will also do if the load in the capstan is excessive.
The first driving wheel of the gear may be mounted on ball bearings if
desired to reduce the friction caused by the weight of the bollard.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. In a capstan the arrangement and combination of the reduction gear, motor,
and bollard, substantially as described.
2. The improved capstan or winding gear substantially as described and
illustrated.
Dated this 30th day of January 1900
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicants.