Year: 1895

page_text: Date of Application, 13th May, 1895
Complete Specification Left, 13th Feb., 1896-Accepted, 28th Mar., 1898
I, WILLIAM MUNRO, of 3 Glen Street, Hebbuin on Tyne, in the County
of Durham, Shipwright, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improved means of securing tubes in tube plates and has
for its object to facilitate the removal of such tubes for cleansing or other
purposes.
To effect this result I propose to tap the holes in the tube plates both back and
front and preferably to somewhat incline o taper the screwed holes.
The back tube plate may receive the screwed and preferably tapered ends of the
tubes and a hollow gland nut may or may not as found deanable be screwed over the
projecting tube end.
At the front tube plate the holes for the tubes will be large enough to allow a
hollow gland or other nut or screwed ferrule to be simultaneously screwed or fitted
over or into the tube and tube plate so as to secure the tube in the nut which in turn
18 secured in the screwed or tapped hole of the tube plate.
The tubo ends hollow nuts or ferrules and holes in the tube plate may all
preferably be formed with a slight taper so as to facilitate the easy withdrawal of
the nuts from the tube plate.
The tube ends as well as the nut head may further have recesses formed on or in
them to enable a spanner of suitable form to be easily applied for their removal or
ndjustment.
The whole of the tubes may be secured as above described in the tube plates or
only a portion of them the remainder being expanded or otherwise fitted in the
known manner and it will be observed that not only do tubes secured as above
described act as efficient stays but as soon as the nut is removed the tube can easily
be drawn through the hole in the tube plate even when a considerable coating of
Jime scale or dirt is adhering to it owing to the hole in the tube plate being
considerably larger than the diameter of the tube.
Dated this 11th day of May 1895.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newonatlo-on-Tyne, Patent Agent
COMPLETE SPECIFICATION.
Improved Means of Seouring Tubes in Tube Plates.
I, WILLIAM MUNRO, of 3 Glen Street, Hebburn on Tyne in the County
of Durham, Shipwright, do horoby 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 relates to improved means of securing tubes in tube plates and has
for its object to facilitate the removal of such tubes for cleansing or other
purposes.
To effect this result I propose to tap the holes in the tube plates both back and
front and to somewhat incline or taper the sorowed holes.

page_text: The back tube plate may receive the screwed and tapered ends of the tubes and
a hollow gland nut may or may not as found desirable be screwed over the
projecting tube end
At the front tube plate the holes for the tubes will be large enough to allow a
hollow gland or other nut or sorowed ferrule to be simultaneously screwed or
fitted over or into the tube and tube plate so as to secure the tube in the nut which
in turn is secured in the screwed or tapped hole of the tube plate.
The tube ends hollow nuts or ferrules and holes in the tube plato may all
preferably be formed with a slight taper so as to facilitate the easy withdrawal of
the nuts from the tube plates.
The tubo ends as well as the nut heads may further have recessos formed on or
in them to enable a spanner of suitable form to be easily applied for their removal
or adjustment.
The whole of the tubes may be secured as above described in the tube plates or
only a portion of thein the remainder being expanded or otherwise fitted in the
kuown manner and it will be observed that not only do tubes secured as above
described act as efficient stays but as soon as the nut is removed the tube can easily
be diawn through the hole in the tubo plate even when a considerable coating of
lime scale or dirt is adhering to it owing to the hole in the tube plate heing
considerably larger than the diameter of the tube
I will fully describe my invention with reference to the accompanying drawinga
in which Figure 1 shows a sectional elevational view and Figure 2 an end view and
in the following description like marks of reference designate like parts.
Refering to the drawings T is a tube the ends of which are tapered and screwed
as shown at T. N is a hollow tapered gland nut adapted to screw both onto the
tapered ends of the tube as well as into the tapered tapped holes in the tube
plates T
As already mentioned in the back tube plate if desired the tapered screwed end
of the tube may be screwed into the tapered hole in the tube plate without the
intervention of a gland nut but at the frout tube plate the gland nut will be used
and I prefer to use it in both tube plates.
The gland nuts may advantageously be made of gunmetal.
Both the nuts and the tube ends have recesses R formed in them. This is
to enable a metal plug (of slightly less diameter than the tube) having projecting
wings or lugs formed on it corresponding to the position and size of the recesses
aforesaid to enter the tube end so as to be a fairly accurate fit theroin and at the
same time the projections on the plug will fit into the recesses in the nut and tube.
A spanner can then be applied to the nut to unscrew both tube and nut together for
the purpose of withdrawing the tube when required.
IIaving 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 16 :-
1. The improved means of securing tubes in tube plates consisting in screwing
simultaneously over the tapered screwed end of the tube and into the tapered
tapped hole in the tube plate a gland nut substantially as and for the purposes
herein set forth.
2. In combination with the subject of the previous claim providing recesses R
in the tube and in the gland nut substantially as and for the purposes herein
set forth.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.