Improvements in and relating to Manhole Doors.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Manhole Doors.
I, HENRY MECHAN, of Mechan & Sons, Neptune Iron, Brass and Copper Works,
60, Elliot Street, Cranstonhill, in the County of the City of Glasgow, Brassfounder,
do hereby declare the nature of my invention to be as follows:
:-
This invention has reference to and comprises improvements in and relating to
manhole doors such as are used for water ballast tanks, boilers and like
purposes and has for its object the enabling of the manhole doors being placed
exactly in their proper position without trouble, and so constructing them that
the least possible obstruction is caused by any portion of the door or its bridges
projecting beyond the line of the tank boiler or like plate in which it is fitted.
The manhole door which may be of the usual oval or any other suitable shape
is preferably stamped or pressed out of a plate of the appropriate size by suitable
dies and has projections preferably four in number formed on its outer surface at
such a distance from its edge that they will be in contact with the inner edge of
the opening to be closed by the door when same is in position. This enables the
door to be fitted exactly in its true position without trouble.
The door is also formed with recessed parts to receive the bridges and the screwed
studs passing through the bridges for the securing nuts to be screwed on are fitted
in the centre of these recesses. An eye bolt may also be fitted in the centre of the
door which is preferably formed with a recessed part to enable the eyebolt to be
fitted flush with level of tank plate. The ends of the bridge pieces rest on the
outside of tank plate and are bent inwards to lie with the recessed parts of door.
Dated the 13th September 1898.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Mannole Doors.
I, HENRY MECHAN, of Mechan & Sons, Neptune Iron, Brass and Copper Works,
60, Elliot Street, Cranstonhill, in the County of the City of Glasgow, Brassfounder,
do hereby declare the nature of my 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 reference being made to the accompanying drawings:-
This invention has reference to and comprises improvements in and relating to
manhole doors such as are used for water ballast tanks, boilers, and like
purposes and has for its object the enabling of the manhole doors being placed
דנסמf

page_text: exactly in their proper position without trouble and so constructing them that
the least possible obstruction is caused by any portion of the door or its bridges
projecting beyond the line of the tank boiler or like plate in which it is fitted.
And in order that my said invention may be properly understood, I have hereunto
appended one sheet of explanatory drawings in which Figure 1 is a section and
Figure 2 a plan of a manhole door constructed in accordance with my improve-
ments.
The manhole door, A which may be, as shown of the usual oval, or any other
suitable shape, is preferably stamped or pressed out of a plate of the approximate
size by suitable dies and has projections a preferably four in number formed on its
outer surface at such a distance from its edge that they will be in contact with the
inner edge of the opening to be closed by the door when same is in position and
so ensure accurate fitting. This enables the door to be fitted exactly in its true
position without trouble.
The door A is also formed with recessed parts a to receive the bridge pieces B
and the screwed studs passing through the bridges B for the securing nuts¸¹
to be screwed on are fitted in the centre of the recesses a¹. An eye bolt C may also
be fitted in the centre of the door which may if necessary be recessed to enable
the eyebolt to be fitted flush with level of tank plate. The ends of the bridge
pieces B rest on the outside of tank plate and are bent inwards to lie within the
recessed parts a' of the door.
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: -
First. Manhole doors constructed substantially as herein described and by way of
example illustrated by the accompanying drawings.
Second. The construction of manhole doors with projections to ensure accurate
fitting substantially as herein described and illustrated by the accompanying
drawings.
Third. The construction of manhole doors with recessed parts to receive inwardly
bent bridge pieces substantially as herein described and illustrated by the acconi-
panying drawings.
Dated the 25th Max 1800