Improvements in Water-tight Doors sor Bulkheads in Ships.
Year: 1892

page_text: Date of Application, 29th Feb., 1892
Complete Specification Left. 25th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Water-tight Doors sor Bulkheads in Ships.
I, GEORGE MACAULAY-CRUIKSILANK C.E. of 62 Saint Vincent Street, in the
City of Glasgow, Chartered Patent Agent, do hereby declare the nature of this
invention (as communicated to me from James Stewart Clark of 42 Gran Via
Bilbao, in the Kingdom of Spain, Naval Architect) to be as follows:-
This invention relates to sliding or vertically moving watertight doors for ships'
bulkheads and the improved door as constructed in accordance with the invention
consists of an iron or other plate the edges of which work in vertical grooves made
in side jambs in or attached to the bulkhead. On the upper part of the door two
worm wheels are separately centred one on each side of a screwed spindle which
passes down from the deck and is geared with the said wheels. Each wheel has a
notch or indent made at one part of the rim and with these notches there are geared
the points of two pawls also centred on the upper part of the door and having
springs provided in conjunction with them to maintain their points in position in
the notches.
At or near the highest point at which it is desired to raise the door a collar or
Hange is made on the screwed spindle and when it is desired to lower the door by
giving the spindle one turn heels upon the pawls are brought in contact with the
said collar whereby the pawls are released from the notches in the wheels and the
door falls by its own weight the motion being controlled by the pawls acting as
brakes on the rims of the wheels or by other means.
ludropping to the closed position of the door the wheels make one revolution
and the notches again come into gear with the pawls thus leaving the door in
position for again being hoisted or for screwing it down watertight.
Dated this Twenty-seventh day of February 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Water-tight Doors for Bulkheads in Ships.
I, GEORGE MACAULAY-CRUIKSHANK C.E. of 62 Saint Vincent Street in the
City of Glasgow, Chartered Patent Agent do hereby declare the nature of this
invention and in what manner the same is to be performed, as communicated to me
to be particularly described and ascertained in and by the following statement :-
This invention relates to sliding or vertically moving water tight doors for ships'
bulkheads and as illustrated in front clevation by Figure 1 in transverse vertical
section by Figure 2 and in horizontal section by Figure 3 of the accompanying
drawings the improved door consists of an iron or other plate A the edges of which
work in vertical grooves B made in side jambs C in or attached to the bulkhead.
On the upper part of the door two worm wheels D are separately centred one on
each side of a screwed spindle E which passes down from the deck and is geared
with the said wheels. Each wheel has a notch or indent a made at one part of the
rin and with these notches there are geared the points of two pawls F also centred
on the upper part of the door each having a spring b fastened by one of its ends to
the door provided in conjunction with it to maintain the point of the pawl in
position in the notch and prevent the wheel from turning whilst the door is being
raised.

page_text: At or near the highest pointent which it is desired to raise the door a collar or
flange G is made on the screwed spindle E and when it is desired to lower the door,
by giving the spindle one turn the heels upon the pawls are brought in contact
with the said collar whereby the pawls are released from the notches in the
wheels D and the door falls by its own weight the motion being controlled by the
pawls acting as brakes on the rims of the wheels or by a piston situated within an
air or oil cylinder H bolted or otherwise secured to the screw the said piston being
fastened on a rod 'l attached at its lower end to the door and passing through the
screw the upper end of the rod also serving to indicate the position of the door.
When an oil or air cylinder is used it can be further utilized in forcing the door
downwards through any obstruction.
In dropping to the closing point of the door the wheels D make one revolution
and the notches a again come into gear with the pawls F thus leaving the door in
position for again being hoisted or for screwing it down watertight. A gong or
bellis or may be fitted to the door to give warning beneath before the door falls.
"Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed as communicated to me
I declare that what I claim is :-
1: A watertight door for bulkheads in ships constructed substantially as described
with reference to the drawings annexed.
2. In a vertically sliding water tight door for bulkheads in ships the combination
of the worm wheels D separately centred on the door the screw E geared with said
wheels and the combined pawls and brakes F substantially as described with
reference to the accompanying drawings.
Dated this Twenty-fourth day of November 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.