An Improved Tool for Trimming, Tapering, and otherwise Manipulating Lead Pipes.
Year: 1895

page_text: Date of Application, 31st Jan., 1895
Complete Specification Left, 25th Apr., 1895-Accepted, 24th May, 1895
PROVISIONAL SPECIFICATION.
An Improved Tool for Trimming, Tapering, and otherwise
Manipulating Lead Pipes.
I, WILLIAM BARNS Junior, of Christopher Works, Chalton Street, London,
Metal Worker do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved tool for trimming, tapering and otherwise
manipulating lead pipes for the purpose of jointing the same together. Such tool
consists of a conical head having two series of blades so arranged that when in use
one series produces an outward and the other series an inward cut. Such tool is
furnished with a suitable handle or its equivalent.
Dated this 31st day of January 1895.
An Improved Tool for Trimming, Tapering, and otherwise
Manipulating Lead Pipes.
I, WILLIAM BARNS Junior of Christopher Works, Chalton Street, London,
Metal Worker 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:-
The object of this invention is to provide a tool whereby a thoroughly sound
joint can be readily and effectively made when uniting the ends of lead pipes.
Hitherto it has been the practice to force the end of one pipe open with a taper
plug and to trim off the end of the other pipe with a knife, the result being that
the end which is so forced open is fractured, while the other end does not fit the
opening, thus involving much labour to remedy these defects and frequently
resulting in an unsound joint being made.
In order to obviate these disadvantages I make a tool consisting of a conical
reversible head which is screwed or otherwise fastened to a suitable handle.
Lateral longitudinal openings are made in such head the alternate edges of
which openings are bevelled to a corresponding angle so as to form two series of
cutting edges, technically known as "proud" edges, the one series acting internally
and the other externally to the cone.
Preferably the top of the cone is externally of a dome shape to allow of a cup
shaped cap or washer fitting over the same. When the conical head is fastened to
the handle with the base of the cone projecting outwards, such cap or washer is
fitted over the top of the cone and secured thereon by screwing or otherwise
fastening such head to the stem of the handle thus keeping the head rigidly in
position when the tool is operated.

page_text: The manner of operating the tool is as follows:-
When it is desired to join the ends of two separate pipes or the two ends of a
single pipe together the conical head is fastened to the handle with the top of the
cone projecting outwards, as shewn in Figure 1 of the accompanying drawings.
Such head is then inserted into the end of the pipe which is to be expanded and is
then simultaneously rotated and forced into the pipe, thus gradually expanding the
end thereof and simultaneously trimming off the superfluous metal therefrom by
bringing one series of cutting edges into operation by the rotary action. The tool
is then taken out and the head removed and refitted to the handle with its base
projecting outwards, the cap or washer having been placed over the top in the
manner already described. The tool is then placed over the end of the pipe which
is to be inserted into the expanded end, similar rotary motion and pressure being
applied, so that the second series of cutters are brought into operation and so trim
the external edge of the pipe to a conical form corresponding with that of the
expanded end of the other pipe, so that when the two pipes are united, they fit
accurately together. By this means a thoroughly sound joint can be made with
less trouble and less solder while there are no interstices through which the solder
can pass into and partially choke the pipe after the joint has been made.
Figures 1 and 2 of the accompanying drawings shew views in side elevation and
plan of the conical head mounted on the handle in position for expanding the end
of a pipe.
Figures 3 and 4 shew corresponding views of the tool with the base of the
conical head projecting outwards and the cap or washer fitted over the top.
Figure 5 is a longitudinal section of such conical head shewing the threaded
aperture in the top.
Similar letters of reference indicate corresponding parts in all the views. a is
the conical head a' the longitudinal lateral openings therein. a² the cutting
edges. the cap or washer. c handle.
It is obvious that such improved tool may be used with advantage for jointing
together any description of pipes which are composed of material susceptible of
being operated thereby.
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 :-
The improved tool for trimming tapering and otherwise manipulating pipes for
the purpose of jointing the same together made substantially as hereinbefore
described and shewn.
Dated t
ח
ELT & Co.,
Registered Patent Agents, 43, Southampton Buildings, Holborn, London,
Agents for Applicant.
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