Improvements in Capstans and the like.
Year: 1891

page_text: Date of Application, 28th Oct., 1891-Accepted, 28th Nov., 1891
COMPLETE SPECIFICATION.
Improvements in Capstans and the like.
We, WILLIAM JONES the elder and WILLIAM JONES the younger, both of
Newport Road, West Cowes, in the Isle of Wight, Shipsmiths, 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 :-
Our invention relates to capstans and the like and comprises novel arrangements
of gearing for communicating motion to the drum.
In the accompanying drawings,
Figure 1 is an elevation of a capstan provided with our improvements; and,
Figure 2 is a central vertical section of the upper portion of the same:
Figure 24 is a section on the line x, Figure 2:
Figure 3 is a plan partly in section; and,
Figure 4 is a section on the line y y, Figure 2.
a indicates the central spindle of the capstan which is firmly secured in position,
and b is the drum rotating thereon and having the whelps c, c and a pawl-head d at
its lower part.
e is what we will term the "fixed head" of the capstan, the said fixed head being
formed integral with the drum b and having internally a set of spur teeth f with
which engage the gear-wheels g, 9, 9 mounted upon studs h, carried upon a plate i
secured to the drum b. j is what we term a "movable head" which fits over the
fixed head e and rotates upon the spindle a, the said movable head having formed
on its underside a pinion k which engages with the wheels g, 9, 9 in such a manner
that, when the movable head is rotated, motion will be imparted to the fixed head e
and consequently to the drum 6 through the medium of the wheels 9, 9, 9.
this arrangement of gearing it will be understood that a much slower rotation will
be imparted to the drum b than is imparted to the movable head j.
With
Motion is imparted to the movable head j through the medium of the shaft / and
the bevel-pinions m, n thereon, adapted to engage with bevel-teeth m¹, n' upon the
upper surface of the movable head j. The shaft and the pinions m, n are carried
in a casing o secured to the upper end of the shaft a by a set-screw p, the said shaft
passing through the spindle. The object of providing the two bevel-wheels m, n
engaging respectively with the gear-teeth m², n' is to allow for rotating the movable.
head at different speeds. When the pinion m is in engagement with the teeth m¹
the head jis rotated more rapidly than when the pinion n is in engagement with
the teeth n¹. In order that only one of the pinions m, n shall be in engagement
with its teeth at the same time, we arrange the said pinions as follows, that is to
say, the pinion m is firmly keyed to the shaft and the pinion n is normally loose
upon the shaft but is prevented from moving longitudinally of the shaft by means
of a lug 9 on the interior of the casing o projecting behind the said pinion m, as
shewn in Figure 2. The adjacent faces of the two pinions m, n are provided with
clutch-teeth so that, when the pinion m is in the position shewn in Figure 2, its
clutch-teeth will engage with those of the pinion n whereby the latter will be
locked to the shaft and thereby, as the said shaft is rotated, communicate motion to
the movable head j, the pinion m being out of engagement with the teeth m³: when,
however, the shaft is moved longitudinally to cause the pinion m to engage with
the teeth m², as indicated by dotted lines in Figure 2, the clutch-teeth of the two
pinions are drawn out of engagement so that, whilst motion is being communicated
to the movable head j through the pinion m, the pinion n runs loosely upon the
shaft 1.
7, Figure 24, is a movable stirrup which is placed at one end or the other of

page_text: the snart in order to retain it in either of the two positions in which it may be
placed.
3, s are whelps. which are formed upon the movable head and which enable
the said movable head to be used for warping a rope in quicker than upon the
drum b.
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 :
-
1. In a capstan or the like the combination with the drum having a fixed head
provided with internal gear-teeth, of gear-wheels engaging with the said teeth and
driven by means of a movable head, the said movable head being provided with
gearing whereby it may be driven at different speeds, substantially as described.
2. In a capstan or the like the arrangement of gearing substantially as herein-
before described and illustrated in the accompanying drawings.
3. The manufacture and use of the improved capstan hereinbefore described and
illustrated in the accompanying drawings.
Dated the 29th dose of
1001
G. F. REDFERN & Co,
4, South Street, Finsbury, London, Agents for the Applicants.