Tubes or Pipes, and the like.
Year: 1887

page_text: Date of Application, 12th July, 1887.
Specification Accepted, 2nd Sept., 1887.
Tubes or Pipes, and the like.
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E. 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 :-
To cut pressed or stamped metal tubes without seams and with bottoms such as
cartridge cases ferrules for sticks and umbrellas or the like or to cut the edges of open
tubes or pipes perpendicular to their longitudinal axis or to cut the latter for pipe
mounts and the like the following processes are generally used.
1. Turning off on the lathe.
2. Cutting with circular saws.
3. Cutting with the well known gas pipe cutter.
4. Tubes closed at one end are generally scored off with a die.
The foregoing processes have the following disadvantages.
1. The turning off on the lathe must be considered as handwork and is therefore
too slow and expensive.
2. If cut with a circular saw, the edges will not be exactly perpendicular to the
longitudinal axis of the tube, as the saw, especially when worked very rapidly does not
run quite straight and it also leaves much burr.
3. The well known gas pipe cutter is not a cutting tool and presses the metal
towards the middle of the tube.
4. If scored off by a die the metal is torn off and the edges present a fringy
appearance.
The apparatus forming the subject of the present application obviates these dis-
advantages and it embraces circular shears the cutters or blades of which are of
different diameter. The tube to be cut is passed over the smaller cutter a but this
can only be done when the larger cutter b stands in the position represented in
Figure 1 i.e. with the straight or reduced part of the edge towards the smaller
cutter a.

page_text: On the shaft A of the larger cutter bare mounted a hand wheel H and a spur
wheel Z having say 36 teeth. This spur wheel gears with the spur wheel Z of say
16 teeth mounted on the shaft B of the smaller cutter a. If the shaft A is therefore
turned one half of a revolution the shaft B with the smaller cutter a, the tube to be
cut and adjustable ring d will be turned for one whole revolution and the space of
two teeth.
The head c which as well as the cutter a corresponds with the diameter of the tube,
serves as a guide for a perpendicular cut and with tubes closed at one end it serves
also to determine the length of the piece to be cut off.
With open rings the adjustable ring d serves as the guide.
To cut the valueless rings or rims cut off from tubes for the purpose of removing
them, a knife e is attached to the lever f. This lever moves in slots g g of the
frame G and a spring h holds the knife blade e between the smaller cutter a and the
adjustable ring d during the cutting operation. At the end of the cutting operation
a cam i fixed to the adjustable ring d (Figure 1) presses the lever f with the knife
blade e down and thus cuts the ring cut off from the tube which ring now can easily
be removed.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same
is to be performed I declare that what I claim is :-
1. In the cutting of tubes the employment of circular shears or cutters of different
diameters and turning at different speeds substantially as specified.
2. In the cutting of tubes the employment of circular shears as claimed in the first
claiming clause in which the edge of one of the cutters is flattened or reduced to
facilitate the introduction of the tube to be cut substantially as specified.
3. In the cutting of tubes the employment of shearing apparatus having circular
shears as claimed in the second claiming clause and in which the ring cut off from
the tube is cut open by a knife over which the said ring passes substantially as and
for the purpose specified.