Year: 1888

page_text: Date of Application, 29th May, 1888
Specification Accepted, 6th July, 1888
I, ROBERT JAMES RAE of 85 Gracechurch Street London 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:-
These improvements in common with those described in my previous Patont
No. 11406, dated 22nd August 1887, have for their principal object the increase of
grip or hold of the chain cable by means of passing it more than once round, or
nearly round, the winding drum or cable holder of the Windlass or Capstan, but in this
instance instead of adopting a fixed cross guide to effect the desired object, as
described in my former Specification, 1 now introduce a revolving guide which is
termed the guide wheel or drum.
The winding drum or cable holder, as in the case of my former patent, is provided
with two or more grooves and it is usually preferred to construct at least one of these
grooves with recesses or projections to correspond with the links of the chain cable,
the guide wheel may in like manner be constructed with one or more grooves, and
one or more of these may be formed to match the links of the chain cable as in the
case of the winding drum but in some cases plain cylindrical drums having a flange
at either end may respectively be used in lieu thereof.
The chain cable is passed round the winding drum and the guide wheel and may
be led over the one and under the other and so cross in a diagonal direction between
the two, or otherwise, so that it is caused to take one or more whole or partial turns
round the winding drum and guide wheel and thereby obtain the increased grip. In
this manner the strain and risk of damage to the Windlass or Capstan is considerably
reduced, and in case of need the ship may ride at anchor with perfect safety without
the aid of mooring bitts.
The Windlass or Capstan is provided with suitable means for throwing the winding
drum or cable holder in and out of gear, and with efficient brakes, and may be
actuated by any of the mechanical appliances usually adopted.
The two sheets of drawings annexed hereto will serve to shew the method of
applying the improvements.

page_text: Fig. 1 is a half plan of windlass and guide wheel with the chain cable rove on.
Fig. 2 is a longitudinal vertical section of Fig. 1 at A. B. g is the pawl.
Fig. 3 is a front elevation of Fig. 1 partly in section at C. D. a is the main
driving wheel, the pawl rim, c the friction brake, e the driving clutch, and a nut
for throwing the clutch in and out of gear.
Fig. 4 is an end elevation of guide wheel partly in section at E. F. Fig. 1.
Fig. 5 is an end view of driving clutch e in Fig. 3, shewing the friction brake and
lever
p.
Fig. 6 is a vertical side elevation of capstan and guide wheel with the chain cable
rove on.
Fig. 7 is a longitudinal sectional plan of Fig. 6 at G. H.
Fig. 8 is a section of guide wheel at J. K. Fig. 6.
Fig. 9 is a vertical half section of Capstan at L M Fig. 6. g is the pawl, the
friction brake, the driving clutch & the cap or cover keyed to the nut working on
the top end of the driving axle so that by operating the cap the driving clutch is
thrown in and out of gear, m is a collar for keeping the cable holder in position when
running loose on the axle, and n a hub or boss keyed on the axle to support the cable
holder o.
Fig. 10 is a sectional plan of Capstan cover shewing the method of securing it to
the nut by means of keys.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed, I declare that what I claim is,
The application to Ships Windlasses or Capstans of guide wheels or drums for the
purpose of enabling the chain cable to take more than one whole or partial turn round
the winding drums or cable holders thereof, in order to increase the grip of the chain
cable, as herein substantially described and shewn on the accompanying drawings.
Dated this 29th day of May 1888.