Improvements in Bulkhead Doors and the like.
Year: 1895

page_text: Date of Application, 9th Oct., 1895
Complete Specification Left, 4th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in Bulkhead Doors and the like.
I, WILLIAM KIRKALDY, of 16, Derby Street, in the City and County of
Glasgow, Engineer, do hereby declare the nature of this invention to be as
follows:-
Fixed to or forming part of a water-tight or air-tight bulkhead or partition, is a
water-tight casing or cylinder with doorways in its circumference.
In this casing is a hollow cylinder with a doorway or doorways in its circum-
ference which revolves and allows free ingress or egress to or from compartments
divided by bulkhead or partition.
To enter or leave compartments so divided the doorway in revolving cylinder is
brought in line with the ingress doorway then passing into and revolving inner
cylinder the ingress doorway in casing is completely closed and rendered water-
tight before the egress doorway is opened in casing and brought in line with door-
way in revolving cylinder.
Dated this Eighth day of October 1895.
I WILLIAM KIRKALDY, of 16 Derby Street, in the City and County of
Glasgow 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:―
This invention has for its aim and object the saving of life and property on land
and at sea by providing a hollow cylindrical door which revolves within a suitable
air and watertight casing fixed to or forming part of an air and watertight
bulkhead or partition dividing air and watertight compartments or fireproof rooms
and the like.
By combining this revolving door and casing as hereinafter described a double
dcor and air-lock is formed which effectually prevents the ingress of fire water or
air under pressure through air and watertight bulkheads or partitions in ships
caissons tunnels structures and the like yet allows free thoroughfare between
compartments or rooms so divided with the certainty that at all times and under all
conditions one of the doors is absolutely closed and air and watertight thus
guaranteeing that the bulkhead or partition is intact and thoroughly reliable in the
event of a sudden disaster.
And in order that my said invention may be fully understood and readily carried
into effect or practice I have hereunto annexed two sheets of explanatory drawings
in which the same reference letters are used to indicate corresponding parts in all
the figures where shown.
Figure 1, on Sheet 1, combines two half elevation views of casing and revolving
door a half sectional elevation and a half outside elevation view.
Figures 2 and 3 on Sheet 2 are sectional plans of casing and revolving door.

page_text: Referring to these drawings
The casing A. as shown on Figures 1, 2, and 3 is a hollow air and watertight
cylinder with a plain or corrugated surface and furnished with two or more door-
ways C, C¹, in its circumference close bottom and open top with bolted-on cover F
and an external flange for bolting to bulkheads and the like.
Within casing A revolving on axial pulleys E is the cylindrical door B which is
a hollow cylinder with a plain or corrugated surface and having essentially a
doorway D in its circumference open ends and handles H', inside and hand
recesses H. outside for revolving door by hand.
When doorways C. and D. in casing A. and revolving door B. are in line as
shown on Figures 1 and 2 free passage through bulkhead or partition is gained by
entering and standing inside of casing A and revolving door B by means of
handles H' when the ingress door C is closed and made air and watertight before
doorway D comes in line with doorway C' to allow egress from casing A.
Figure 3 shows an air-lock formed by doors C, C¹, being closed and airtight and
ingress or egress from compartment under pressure of air is obtained by revolving
door B by means of handles H' inside or hand recesses H outside until doorway D
is in line with doorway in casing A.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare what I
claim is :
1. A hollow cylindrical door furnished essentially with a doorway in its circum-
ference and revolving within a suitable air and watertight cylindrical casing
furnished with two or more doorways in its circumference substantially as and in
the manner and for the purposes hereinbefore described.
2. The combination and arrangement of parts forming a double door and air-
lock substantially as and for the purposes herein before described.
Dated this Third day of December 1895.
WILLIAM KIRKALDY.