Improvements in and relating to Capstans or Cable Wheels.
Year: 1898

page_text: We, THOMÁS MAXWELL GRANT and ALEXANDER KELLY, botly of Napier
Brothers, Limited, Engineers, 100, Hydepark Street, in the County of the City
of Glasgow, and CHRISTAIN DETHLEFF BIRCK HANSEN, Draughtsman to said:
Company, do hereby declare the nature of our invention to be as follows;-
This invention has reference to improvements in and relating to capstans or
cable wheels.
According to our improvements we mount on a pivot extension of the vertical
shaft of capstan an inverted dish-shaped plate formed with a hand operating
wheel. This plate would be formed with curved scroll or cam grooves into which
would work the vertical pins from the radial bolts, and on turning the hand
wheel these bolts would shoot from the usual disc plate keyed to vertical shaft
into recesses in cable wheels and so couple same to the vertical shaft. Slots may
be formed round the grooved plate, so that a lever may be placed in any of these
to turn the plate instead of doing so by the hand wheel.
By an alternative arrangement instead of a grooved scroll plate, two eccentrics
would be mounted on shaft pivot, and have rod extensions to each of the bolts,
and be operated by a hand wheel to shoot into recesses of cable wheel.
The strap brake would be operated through a bevel rack and bevel wheel or
worm rack and worm, the wheel or worm being mounted on a horizontal spindle.
This spindle would be fitted with a worm wheel which would be operated by a
screw worm on a vertical shaft with hand turning wheel on top.
Dated the 9th Wahmam 1808
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Capstans or Cable Wheels.
We, THOMAS MAXWELL GRANT and ALEXANDER KELLY, both of Napier
Brothers, Limited, Engineers, 100, Hydepark Street, in the County of the City
f Glasgow, and CHRISTAIN DETHLEFF BIRCK HANSEN, Draughtsman to said
ompany, do hereby declare the nature of our invention and in what manner
Price 8d.

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say:-
This invention has reference to improvements in and relating to capstans or
cable wheels.
And in order that our said invention and the manner of carrying same into
practice may be properly understood, we have hereunto appended a sheet of
explanatory drawings in which the same reference letters are used to denote like
parts in the various figures where shown.
Figure 1 is an elevation of a capstan with brake as fitted in accordance with
our improvements. Figure 2 is a corresponding plan view with the capstan head
removed. Figure 3 is a sectional elevation looking at right angles to Figure 1.
Figure 4 is an inverted plan of the plate A. Figure 5 is a detached plan view
of the top of cable wheel C and disc plate b. Figures 6 and 7 are a plan view.
and elevation respectively of the alternative arrangement for operating the
locking bolts by means of eccentrics, and Figure 8 is a detached elevation of
the hand gear for operating the strap brake.
Referring to these drawings:-
According to our improvements we mount on a pivot extension of the vertical
shaft of capstan an inverted dish shaped plate A formed with a hand operating
wheel or wheel frame A'. This plate A would be formed with curved scroll or
cam grooves a into which would work the vertical pins a' from the radial
bolts and on turning the hand wheel A¹ these bolts a would shoot from the
inverted disc plate keyed to vertical shaft B into recesses c in cable wheels C
and so couple same to the vertical shaft B. Slots a³ may be formed round the
grooved plate A so that a hand lever a may be placed in any of these to turn
the plate A instead of doing so by the hand wheel A¹.
By an alternative arrangement instead of a grooved scroll plate A two eccen-
trics I would be mounted on shaft pivot B₁ and have rod extensions D¹ to each
of the bolts a² and be operated by a hand wheel A' to shoot into recesses c of
cable wheel C.
The strap brake consists of two straps E partly embracing the brake disc C¹ of
cable wheel G and the ends of these two straps are attached by means of links C².
to a differential lever E. This lever is pivotted on two centre pivots E in
such a manner that when turning the lever to the right hand or to the left hand
one or other of these pivots E comes into operation as a fulcrum for the dif-
ferential lever E4. From this arrangement there arises a differential action on
the brake straps E in such a manner that the one end of the strap is tightened.
more than the other end yields. Thus the brake tends to free itself in one direc-
tion and tighten itself more in the other direction.
The differential lever E is formed with a bevel rack on its outer circum-4
ference worked by a bevel wheel E2 or an equivalent worm rack and worm, the
wheel being mounted on a horizontal spindle E3. This spindle E3 would be
fitted with a worm wheel e which would be operated by a screw worm on a
vertical shaft and hand turning wheel on top.
Having now particularly described and ascertained the nature of
our said 4
invention and in what manner the same is to be performed. we declare that what
we claim is:-
First. The arrangement in combination of the parts of a capstan or cable
wheel, constructed and operated in the manner herein described in reference to
and shown in the accompanying drawings.
5
Second. In capstans or cable wheels, the arrangement of dish shaped plate
formed with scroll or cam grooves for operating the locking bolts substantially
as herein described in reference to and shown in the accompanying drawings.
Third. In capstans or cable wheels the arrangement of eccentrics for operating
the locking bolts, substantially as herein described in reference to and shown 5
in the accompanying drawings.

page_text: Fourth. In capstans or cable wheels the arrangement in combination of the
strap brake consisting of two straps connected to a different lever which may be
tightened either on the right hand or on the left hand and operated through
bevel rack and wheel, or equivalent worm rack and worm, and controlled by a
worm wheel and worm and hand wheel, substantially as herein described in
reference to and shown in the accompanying drawings.
Dated the 5th day of November 1808
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.