An Electric Capstan.
Year: 1891

page_text: Date of Application, 7th May, 1891
Complete Specification Left. 8th Feb. 1892-Accented, 12th Mar. 1892
PROVISIONAL SPECIFICATION.
An Electric Capstan.
I, GEORGE SYLVESTER GRIMSTON, of Claremont, Glenluce Road, Westcombe
Park, in the County of Kent, Electrical Engineer do hereby declare the nature of
this invention to be as follows:-
According to this invention, a dynamo electric machine and suitable speed
reducing gear, which may be worm or differential gear or ordinary toothed gearing
connecting the shaft of the dynamo machine to the shaft of a capstan, are enclosed
in a watertight casing under the capstan, which is provided as usual with pawls to
prevent it from turning back, and is preferably engaged with its shaft by a clutch
that can at will be moved so as to disengage it. Within the casing is arranged an
electrical controlling switch which can be worked by an external handle.
Dated this 7th day of May 1891.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Electric Capstan.
I, GEORGE SYLVESTER GRIMSTON of Claremont, Glenluce Road, Westcombe
Park in the County of Kent, Electrical Engineer 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 :-
According to this invention, a dynamo electric machine and suitable speed
reducing gear, which may be worm or differential gear or ordinary toothed gearing
connecting the shaft of the dynamo machine to the shaft of a capstan, are enclosed
in a watertight casing under the capstan which is provided as usual with pawls to
prevent it from turning back. The apparatus is also provided with an electrical
controlling switch by which it can be started, stopped or have its speed varied as
desired.
Fig. 1 of the accompanying drawings is a longitudinal section partly in elevation
and Fig. 2 is a sectional plan of an electric capstan according to my invention.
Fig. 3 is a vertical section shewing a modified construction.
Referring to Figures 1 and 2, A is the watertight casing within which is
arranged the dynamo machine D and the gearing for working the capstan C. The
gearing consists of a pinion d on the armature shaft gearing with a toothed wheel b
on a countershaft B, on which is a worm gearing with a worm wheel c on the vertical
shaft of the capstan C. By means of a lever L working a suitable electric switch S
the dynamo machine and capstan can be started, stopped or driven with greater or
less power or speed.
As shewn in Fig. 3, the dynamo machine D is arranged within the casing A
with its shaft vertical, driving the capstan shaft at speed greatly reduced by
differential gear G of known construction, that is to say, there is a lower stationary
wheel having a considerable number of internal teeth and an upper wheel fixed on
the capstan shaft and having a number of internal teeth differing by one from the
number in the wheel below. Within these wheels a pinion gearing with both being
carried rapidly round by a crank on the dynamo shaft, causes the upper wheel
and capstan to revolve at greatly reduced speed. Other known forms of differential
gear may be employed.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
An electric capstan driven by reducing gear from a dynamo-electric machine
which, with the gear, is enclosed within a watertight casing under the capstan,
substantially as described.
בAT
1000
ABEL & IMRAY,
Agents for the Applicant.