Improvements in Tubing Steam Boilers, and in Tools employed for that Purpose.
Year: 1891

page_text: Date of Application, 2nd Apr., 1891 ·
Complete Specification Left, 14th Dec., 1891-Accepted, 6th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Tubing Steam Boilers, and in Tools employed for
that Purpose.
I, CLAUDE KENNEDY MILLS of 23 Southampton Buildings in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention, a
communication to me by Caraman, Vassel & Cic. Mechanical Engineers of 102 Ruc
Tronchet, Lyons, in the Republic of France, to be as follows:-
The system of tubing which is the object of the present invention consists of
annular grooves made in the interior of the holes in the tube plate. These grooves
are furnished with metal rings which crush by the expansion of the tube and assure
a perfect joint without it being necessary to rivet or upset this latter.
The invention also comprises a special tool for making the said grooves, as shown
at Figures 1 to 3 of the accompanying drawings.
Figure 1 is a longitudinal section of the tool whilst in use.
Figure 2 is an exterior view of the mandrel and
Figure 3 is a section drawn on the line 1-2 of Figure 2.
This tool like those used for expanding the tubes in the known system of tubing
is composed of a mandrel A carrying three cutting or grinding rollers C, which are
forced outwardly by the introduction of a conical mandrel B, the rotation of which
produces that of the cutting rollers.
In my apparatus one or two of the cutting or grinding rollers C is or are
furnished with projecting ribs a, a, destined to cut its way into the tube plate T in
order to form the grooves, each cutting or grinding roller is held in the mortise of
the mandrel by two small trunnions located in the grooves e, e, which do not open
out on the exterior, so that the cutting or grinding rollers introduced from the
interior cannot fall out of position when the conical pin B is in place. A nut E
prevents the conical mandrel from leaving the mandrel A.
The tool being introduced into the tube plate T as represented at Figure 1 the
conical pin B is driven therein and made to turn by means of the square end h.
The cutting or grinding rollers C being slightly inclined to the axis of the mandrel
as shown at Figure 2, their turning tends to make them advance, but this advance-
ment is limited by three rollers & G turning on axes fixed to the mandrel and
which bear when rolling on the tube plate. The mandrel A carries at its extremity
a square F, which serves to disengage it when needed by turning it in the contrary
direction.
When the grooves are formed the conical mandrel is withdrawn by disengaging
it as required by means of the nut D, which is capable of bearing against the head
of the mandrel A. This nut also serves as an abutinent to facilitate the driving in
of the conical mandrel B.
In order to mount the tube, wire rings, n, Figure 4, are placed in the grooves
thus formed, then the tube is introduced and it is enlarged by well known
means.
A tool similar to that shown at Figure 1 may be used for this purpose but the
three rollers of which are smooth. The joint is then complete and the metallic
packing being firmly embedded in the tube renders any leakage impossible.
Two or more grooves may be made in the tube plate according to the thickness
thereof.
1 1
"
1001

page_text: Improvements in Tubing Steam Boilers, and in Tools employed for
that Purpose.
I, CLAUDE KENNEDY MILLS of 23 Southampton Buildings in the County of
Middlesex Patent Agent do hereby declare the nature of this invention, a
communication to me by Caraman, Vassel & Cie. Mechanical Engineers, of
102 Rue Tronchet, Lyons, in the Republic of France, and in what manner the
same is to be performed to be particularly described and ascertained in and
by the following statement, reference being had to the drawings accompanying
my Provisional Specification and to the letters and figures marked thereon:-
The method of tubing which is the object of the present invention consists of
annular grooves made in the interior of the holes in the tube plate. These grooves
are furnished with metal rings which are crushed or compressed by the expansion
or enlargement of the tube and assure a perfect joint without it being necessary to
rivet or upset this latter.
The invention also comprises a special tool for making the said grooves, as shown
at Figures 1 to 3 of the drawings.
Figure 1. is a longitudinal section of the tool whilst in use.
Figure 2 is an exterior view of the mandrel and
Figure 3 is a section drawn on the line 1-2 of Figure 2.
This tool like those used for expanding the tubes in the method of tubing
hitherto in use is composed of a mandrel A carrying three rollers C which are
forced outwardly by the introduction of a conical spindle B the rotation of which
produces that of the cutting rollers.
In my apparatus one or two of the rollers C is or are furnished with projecting
ribs a. a destined to cut their way into the tube plate T in order to form the
grooves, each cutting or grinding roller is held in the mortise of the mandrel by
two small trunnions located in the grooves e. e, which do not open out on the
exterior, so that the cutting or grinding rollers introduced from the interior cannot
fall out of position when the conical spindle B is in position. A nut E prevents
the conical spindle from leaving the mandrel A.
The tool being introduced into the tube plate T as represented at Figure 1. the
conical spindle B is driven therein and made to turn by means of the square end b.
The cutting or grinding rollers C being slightly inclined to the axis of the mandrel
as shown at Figure 2 their turning tends to make them advance, but this advance-
ment is limited by three rollers G G turning on axes fixed to the mandrel and
which bear when rolling on the tube plate. The mandrel A is furnished at its
extremity with a square F which serves to disengage it when needed by turning it
in the contrary direction.
When the grooves are formed, the conical spindle is withdrawn by disengaging
it as required by means of the nut D which is capable of bearing against the head of
the mandrel A. This nut also serves as an abutment to facilitate the driving in of
the conical spindle B.
In order to mount the tube in the tube plate wire rings n n Fig. 4 are placed in
the grooves thus formed, then the tube is introduced and it is expanded or enlarged
by well known means.
A tool similar to that shown at Figure 1. may be used for this purpose but the
three rollers of which are smooth.
The joint is then complete and the metallic packing being firmly compressed by
the enlargement of the tube renders any leakage impossible after the tube is fixed
in position.
Two or more grooves may be made in the tube plate according to the thickness
thereof.

page_text: 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 method of tubing applicable to steam boilers and consisting of forming in
the interior of the holes in the tube plate annular grooves in which metallic wire
rings are placed which are strongly compressed by the enlargement of the tube
when fixing it in position substantially as herein shown and described.
2. A special tool formed of a mandrel carrying three rollers one or two of which
is or are furnished with projecting ribs to form the grooves above mentioned, these
rollers being forced outwards and put in motion by the rotation and driving in or
advancement of a conical spindle substantially as herein shown and described.
Dated December 14 1901
By Harris & Mills,
C. K. MILLS.
23, Southampton Buildings, London, W.C., Agents.