Year: 1887

page_text: Date of Application, 7th Apr., 1887
Complete Left, 9th Jan., 1888
Complete Accepted, 24th Feb., 1888
We, AUGUSTUS JOHN MARQUAND, Engineer, and SEBASTIAN WILLIAMS, Engineer,
both of Bute Docks, Cardiff, in the County of Ghamorgan, do hereby declare the
nature of this invention to be as follows:-
Our invention relates to an improved construction of rotary cutters for severing
boiler tubes, when the latter are in position in their boiler.
In carrying it into effect, we provide a tubular boss which approximately fits the
bore of the tube to be cut, and has a certain number of holes aligned in a circle cut
therein. A fixed or movable cutter is provided for each hole. The series of cutters
or cutter-arms is engaged by a taper mandrel which can be moved axially through the
tubular boss in either direction. For the purpose of effecting this engagement,
longitudinal slots or their equivalent are cut in the periphery of the mandrel, and
which receive the correspondingly shaped inner ends of the cutters or of their arms.
A guide may be provided to regulate the radial travel of the cutters.
A movable collar is fixed on the mandril to hear against the boiler plate. A nut on
the mandrel outside the collar provides for the rotation of the mandril and cutters by
a spanner or other equivalent device.
PHILLIPS & LEIGH,.
Agents for the Applicants.

page_text: Improvements in Tube Cutters for Boiler and other Tubes.
We, AUGUSTUS JOHN MARQUAND, Engineer, and SEBASTIAN WILLIAMS, Engineer,
both of Bute Docks, Cardiff, in the County of Glamorgan, 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 :-
Our invention relates to an improved construction of rotary cutters for severing
boiler tubes, when the latter are in position in their boiler.
In carrying it into effect, we provide a tubular boss which approximately fits the
bore of the tube to be cut, and has a certain number of holes, aligned in a circle, cut
therein. A fixed or movable cutter is provided for each hole. The series of cutters or
cutter-arms is engaged by a taper mandrol which can be moved axially through the
tubular boss in either direction. For the purpose of effecting this engagement,
longitudinal slots or their equivalent are cut in the periphery of the mandrel, and
which receive the correspondingly shaped inner ends of the cutters or of their arms.
A guide may be provided to regulate the radial travel of the cutters.
A movable collar is fixed around the mandrel and tubular boss to bear against the
boiler plate. A nut outside the collar provides for the rotation of the mandrel and
cutters by a spanner or other equivalent device.
In order that my invention and the means by which the same may be carried into
practical effect may be thoroughly understood we will describe the same in detail
referring in so doing to the the accompanying drawings which are to be taken as part
of this specification and read therewith.
Fig. 1 is a side elevation illustrating our invention.
Fig. 2 is an end elevation.
Fig. 3 is an end elevation of cutters guide plate and mandrel.
Fig. 4 is an elevation of the guide plate.
Figs 5, 6 and 7 illustrate modifications in the cutters.
Fig. 8 is a sectional longitudinal elevation of the tubular boss and the movable
collar.
Fig. 9 is an elevation of the taper mandrel.
Figs. 10 and 11 are elevations thereof.
A is the mandrel; a, a collar formed thereon, and a¹, a hole therein, by means of
which, and the nut, a², the cutter can be rotated. Longitudinal grooves, b, are cut in
the taper part of the mandrel, for the purpose of receiving the dove-tail ends, 61, of
the cutters, B. A plate, c, and nut, c¹. are provided to close the grooves, b.
D is a tubular boss, having holes, d, cut in it through which the cutters project.
E is a guide-plate having radial grooves, e, cut in it; in which the cutters, B, move.
F is a collar adapted to bear upon the boiler plate.
We do not confine ourselves to the style or shape of cutters B. They may be either
rolling, or of any other convenient shape.
A tube cutter made according to our invention is operated is follows.
The tubular boss is pushed into the tube to be cut, and the mandrel forced forwards
until the cutters are in touch with the bore of the tube. The mandrel is then rotated,

page_text: being pushed forward at the same time to keep the cutters up to their work. When
the tube is cut through, the mandrel is pulled backwards, thereby withdrawing the
cutters.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what wo
claim is :-
1. The combination of tapered and grooved mandrel and cutters adapted to be
engaged by said mandrel, substantially as described.
2. The combination of tapered and grooved mandrel, cutters adapted to be engaged
by the grooves in said mandrel, tubular boss and guide plate; substantially as described
with reference to the accompanying drawings.
Tatal thi of Tonne 1000
PHILLIPS & LEIGH,
Patent Agents,
22, Southampton Buildings,
Chancery Lane, W.C.,
Agents for the Applicants.