Improvements in and relating to Silent-acting Steam Winches.
Year: 1894

page_text: Date of Application, 30th Mar., 1894
Complete Specification Left, 29th Dec., 1894-Accepted, 2nd Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Silent-acting Steam Winches.
We, THOMAS MAXWELL GRANT, and ALEXANDER KELLY, both of the Firm
of Napier Brothers, Limited, Engineers, 100 Hydepark Street, in the City and
County of Glasgow, and CHRISTIAN DETHLEFF BIRCK HANSEN, Draughtsman
to said firm, do hereby declare the nature of our invention to be as follows:-
This invention has reference to and comprises an improved arrangement and
combination of the parts of a steam winch, and especially the brake and clutch
mechanism, so as to make said winches work noiselessly when loading and
discharging ships' cargoes and the like.
Two engines would preferably be used placed horizontally so as to work a crank
shaft carried in bearings in a vertical frame. This shaft would have loosely
mounted on it a rope or chain drum of different diameters to suit for varying loads.
A movable friction clutch would be mounted on the crank shaft at one end of the
winding drum so as to gear with the latter when a load has to be elevated, and be
disconnected when the winch is to be used for other purposes such as to act as a
windlass for hauling in cables or warps round pulleys or drums mounted on ends of
crank shaft.
A silent-acting and self holding brake would be mounted round the crank shaft
on the opposite end of load elevating drum to that of the clutch, of the differential
acting strap brake coustruction, and this brake can be set to act in either direction
of rotation of drum.
Dated the oath March 1801
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Silent-acting Steam Winches.
We, THOMAS MAXWELL GRANT, and ALEXANDER KELLY, both of the Firm
of Napier Brothers, Limited, Engineers, 100 Hydepark Street, in the City and
County of Glasgow, and CHRISTIAN DETHLEFF BIRCK HANSEN, Draughtsman
to said firm, do hereby declare the nature of our invention, and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement in writing, that is to say :-
This invention has reference to and comprises an improved arrangement and
combination of the parts of a steam winch, and especially the brake and clutch
mechanism, so as to make said winches work noiselessly when loading and
discharging ships' cargoes and the like.
And in order that our said invention, and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended an explanatory sheet of drawings in which the same reference letters are
used to indicate corresponding parts in all the figures where shown.
Figure 1 is a side elevation of a coupled cylinder silent acting steam winch as

page_text: fitted with our improvements. Figure 2 is a plan view of same, and Figure 3 is a
front elevation at right angles to Figure 1.
Figures 4 and 5 are detached transverse and longitudinal sectional enlarged
views of the clutch mechanism; while
Figure 6 is a detached enlarged view of the strap brake.
Referring to these drawings:-Two engines would preferably be used A A¹
placed horizontally so as to work a crank shaft B carried in bearings in a vertical
frame A². This shaft B would have loosely mounted on it a rope or chain drum of
different diameters C C¹ to suit for varying loads. A movable friction clutch D
would be mounted on the crank shaft B at one end of the winding drum C so as to
gear with the latter when a load has to be elevated, and be disconnected when the
winch is to be used for other purposes such as to act as a windlass for hauling in
cables or warps round pulleys or drums B' mounted on ends of crank shaft B, and
this clutch would be constructed in an ordinary manner, such as shown in Figures 4
and 5, and be operated by a hand lever D' to put it into gear with or disconnect it
from the winding drum C.
A silent-acting and self holding brake E would be mounted round the crank
shaft B on the opposite end C of load elevating drum to that of the clutch, and
this brake would be formed of the differential acting strap brake construction,
with inner wooden blocks e, as shown detached in Figure 6, and this brake can be
set by the hand lever E' and links E2 to act in either direction of rotation of
drum C C¹.
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
"
The constructing of silent-acting steam winches with winding drums, movable
friction clutch, and silent differential acting strap brake, all mounted on the same
crank shaft, substantially as herein described in reference to and shown in the
accompanying drawings.
Dated the 28th December 1894.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agent..