Improvements in Apparatus for Cutting Manholes and the like in Ships, Decks, Plates, and other Objects.
Year: 1894

page_text: Date of Application, 27th Nov., 1894
Complete Specification Left, 1st Mar., 1895-Accepted, 14th Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting Manholes and the like in
Ships, Decks, Plates, and other Objects.
THOMAS WALLACE 39 Carlisle Street Barrow-in-Furness Lancashire Driller
and Hole Cutter do hereby declare the nature of this invention to be as follows:-
An improvement on the tool holder of J. H. Smiles Patent, No. 4087, Sep. 22nd
1881, it consists in joining a new tool holder to the old one at the lower side.
The new holder carrying a dovetail recess at the side to fix the cutter in, secured
by an adjustable countersunk head set pin. There is a hole through the cutter,
countersunk & three holes tapped in the dovetail recess, so that the cutter can
be lengthened or shortened as desired. The new holder is fed by the star wheel
employed on the old one. A dovetail is fixed on the outside of the old tool
holder box, which gives the new holder greater strength and easy movement.
The advantages of this new holder are, it enables the tool to travel through any
number of plys (plates) iron or steel. As each ply is cut through take it out
if necessary & commence the same operation on the next ply. By fixing the
cutter to the side it enables a machine to cut a larger and a deeper hole. Oue
cutting tool will fit both holders to be used as desired suitable for protective
decks side lights of great thickness and holes in ships decks were the wood is
laid on.
Can be applied to any hole cutting machine.
Dated this 27th day of November 1894.
Improvements in Apparatus for Cutting Manholes and the like in
Ships, Decks, Plates, and other Objects.
I, THOMAS WALLACE of 39 Carlisle Street Barrow-in-Furness in the County
of Lancashire Driller and Hole Cutter 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 :-
This invention relates to apparatus for cutting holes in metal plates such as
manholes portholes and the like and my improvements consist in an attachment to
apparatus such as is set forth in the Specification of Letters Patent No. 4087 of 1881,
granted to John Henry Smiles and which is now generally employed whereby
larger and deeper holes, that is to say, holes penetrating a greater number of plates
or thicknesses of plate can be effected without removing the upper plates.
According to the old arrangement of tool holder referred to, when a certain
thickness or ply of plate has been cut through the edge or bottom of the holder
abuts against the top of the plate and stops further progress until one or more ply
has or have been removed. This is due to the fastening of the tool in the middle
of the holder.
In order to obviate the necessity now existing of removing one plate after another
to enable the old arrangement of tool holder to continue its work I fix temporarily

page_text: or permanently to the side of the old holder at the bottom end my new tool holder
attachment and when the original tool has cut as deep as it can be fed then I remove
that tool and fix it, or another, in my new attachment. The tool is then located so
that the whole of the parts come inside the hole in process of being cut and are
therefore not impeded by the plate.
I will now fully describe my improvements with reference to the accompanying
drawings in which Figures 1 and 2 are elevations at right angles to each other and
Figures 3 and 4 sectional plan and plan views respectively. Like letters of
reference indicate like parts.
The arrangement of the parts of the tool holder as now used is as follows: —
A is the holder box, B the tool holder, C the tool secured by a set pin or screw.
Dis a nut in the holder for the feed screw E which is operated by the star wheel F
GG are projections for fastening the box to the machine frame.
My new attachment to this old holder is as follows:-
;
Upon or in the side of the holder for a short distance at the bottom thereof and
along the side of the box I fix or form a dovetail d' d upon which fits the new tool
holding attachment b. The two holders may be permanently fixed together at their
bases by rivets or bolts, but I prefer to employ a detachable connection which may
conveniently be effected by one or more countersunk-head bolts such as g. This
holder has a recessed dovetail extending longitudinally up its face in which the
tool c fits and is secured in any desired position by an adjustable countersunk head
set pin e fitting into a corresponding countersink 1 in the tool bed or recess. Three
or more similar holes 2, 3 are tapped in the holder 6 so that any one may receive
the set pine and in this manuer the tool can be lengthened or shortened as required
to suit the work and the travel of the feed screw E by which both holders are
synchronously fed, the one, B, inside the box A and the other, b, sliding upon its
face, as will be readily understood, on the dovetail d.
can
By this arrangement of supplementary tool holding attachment great strength
and easy movement accrue and by suitably adjusting the length of the tool
travel through any number of plies, plates or thicknesses of metal, for as the cut
becomes so deep that the foot of the attachment approaches or touches the plate
the tool is lengthened and the work proceeds in the next lower plate. Also by
thus fitting the tool in the attachment a larger hole can be cut owing to its increased
distance from the centre of motion.
It will of course be understood that the number of plies cut through, before the
removal of any, is determined by their thickness, by the strength of the tool and
like practical working limits.
The apparatus is suitable for protective decks, side lights and the like of several
thicknesses as well as holes in decks when the wood is laid on and it may be readily
adapted and applied to any hole cutting apparatus.
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 :-
:-
1. The hereinbefore described improved arrangement of hole cutting apparatus
which consists of the supplementary tool holding attachment to one side of existing
tool holders substantially as and for the purposes set forth.
2. The combination with existing hole cutting apparatus such as is before referred
to of a supplementary tool holding attachment constructed and arranged or adapted
to operate substantially in the inanner and for the purposes herein before describel
and illustrated in the drawings.
Dated this 13th der of Avenct 1903
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.