Improvements in Sky-lights for Ships.
Year: 1890

page_text: Date of Application, 3rd Nov., 1890
Complete Specification Left, 17th Dec., 1890-Accepted, 7th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Sky-lights for Ships.
I PETER MITCHELL, of Greatham Terrace, West Hartlepool, in the County of
Durham, Assistant Manager of Ship Yard and Graving Docks, do hereby declare
the nature of this invention to be as follows:-
My invention chiefly relates to improvements in engine-room sky-lights but my
improvements are also applicable to cabin and other sky-lights.
Engine-room sky-lights are now generally constructed in such a manner that, in
order to lift the valves and other parts of the engines out of the engine-room,
the sky-light has to be bodily removed from the joint level with or slightly above
the deck.
According to my invention I obviate this inconvenience by rendering the upper
part of the roof of the sky-light removable independently of the lower part, and
providing means whereby it may be readily moved.
In practice I prefer to form my upper removable portion of the sky-light in the
form of a lantern and to arrange the same to slide laterally upon guides, screws
being provided in connection with the guides for effecting the movement of the
lantern. Around the lantern I advantageously form a series of doors which can be
more or less opened or closed as desired."
It is obvious that I can thus provide for ventilating the engine-room by opening
the doors according to the direction of the wind.
Dated the 3rd day of November 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sky-lights for Ships.
I, PETER MITCHELL, of Greatham Terrace, West Hartlepool, in the County
of Durham, Assistant Manager of Ship Yard and Graving Docks, 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 :-
My invention chiefly relates to improvements in engine-room sky-lights but
my improvements are also applicable to cabin and other sky-lights.
Engine-room sky-lights are now generally constructed in such a manner that,
in order to lift the valves and other parts of the engines out of the engine-room, the
sky-light has to be bodily removed from the joint level with or slightly above
the deck.
According to my invention I obviate this inconvenience by rendering the upper
part of the roof of the sky-light removable independently of the lower part, and
providing means whereby it may be readily moved.
In practice I prefer to form ny upper removable portion of the sky-light in the
form of a lantern and to arrange the same to slide laterally upon guides, screws
being provided in connection with the guides for effecting the movement of the
lantern. Around the lantern I advantageously form a series of doors which can be
inore or less opened or closed as desired.
It is obvious that I can thus provide for ventilating the engine-room by opening
the doors according to the direction of the wind.

page_text: To enable my invention to be fully understood I will describe the same with
reference to the accompanying drawing, in which:
:-
Figure 1 is a plan of my improved sky-light; and,
Figure 2 a transverse section.
1
à indicates the lower part of the sky-light which is attached to the deck, and
the upper part which is connected to the lower part by flanges and bolts as at c.
d is the lantern light and ff are the guides upon which the lantern is adapted to
slide, for instance to the position indicated by the dotted line e in Figure 2, so that
the upper part of the roof of the sky-light is open to permit of passing objects
therethrough.
In order to provide for shifting the lantern I advantageously arrange in
connection with each guide fa screw-rod g, one end of which is secured to. the
lantern, as shewn, whilst the other end is passed through a nut supported
in bearings on the said guide and adapted to be rotated by a hand-wheel i
to cause the rotation of the nut in such a manner as to move the lantern.
jjare doors around the sides and at the ends of the lantern, and k, k and 1, are
racks and guides respectively, by means of which the said doors may be adjusted in
any position according to requirements. m, m indicate glasses which may be placed
in the said doors j, j and in the roof of the sky-light.
In addition to the advantage hereinbefore referred to of being able to lift heavy
bodies through the sky-light without entirely removing the latter, my invention
possesses the further advantage, that a much more effective ventilation can be
obtained than is possible with sky-lights of ordinary construction.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
:-
1. A ship's sky-light, the upper portion of which is designed to be moved laterally
relatively to the lower portion, substantially in the manner, and for the purpose,
described.
2. A ship's sky-light provided with a lantern adapted to be moved laterally,
substantially in the manner hereinbefore described and illustrated in the accom-
panying drawing.
Dated the 17th d
בד
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.