Improvements in Apparatus for Operating Piercing, Cutting, Boring, or other like Tools by Means of Air Pressure.
Year: 1893

page_text: Date of Application, 9th Nov., 1893
Complete Specification Left. 7th Sept., 1894-Accepted, 9th Nov., 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Operating Piercing, Cutting,
Boring, or other like Tools by Means of Air Pressure.
A communication by ROBERT PRITSCH, of 7, Handgasse, Würzburg, in the
Empire of Germany, Mechanic.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, hoth in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
So-called pneumatic spring copying devices have hitherto been employed in
which a needle is alternately driven by means of compressed air against the
surface of a piece of paper, and again drawn back from the same by means of a
spring. The air employed in this case is enclosed between two membranes which
are stretched over two cylinders which are independent of one another but are
connected by means of a tube, one of these membranes being moved inwards at
short intervals of time by means of a mechanically operated piston, and thereby
the air contained is compressed. This pressure is communicated by the enclosed
air to the other membrane, which thereupon makes a movement outward and by
this movement operates a needle. As soon as the pressure of the piston on the
first membrane ceases, a counter spring connected with the needle returns the whole
mechanism, that is to say, the needle, and both membranes, together with the
enclosed air, to their original position.
This mode of working was a very uncertain and inconvenient one owing to the
use of membranes on the one hand and a spring on the other.
In the invention which forms the object of this Application, membranes and other
intermediate parts, as well as the spring are dispensed with, and by that means a
very even and certain mode of working is obtained. Further by this invention it
is not only possible to operate a needle, or other like perforating appliance, but
also any other suitable tool such as a borer, cutter or the like.
Two or more closed cylinders are employed arranged separate from one another,
but connected by means of a closed air pipe and in each of these cylinders a piston
is moved up and down. In one of these cylinders this is done by mechanical
in the other, which is connected with the first by an india-rubber tube, by
means of air pressure. A needle or other suitable tool is connected with the
second piston, and is set in operation when the first piston moves under the action
of the mechanical means employed for operating it.
means,
The cylinder which contains the piston which is operated mechanically, is
mounted on a suitable stand made of metal, or the like, which also carries the
piston operating mechanism.
A piston travels, as already stated, in this cylinder, and is connected by means
of its connecting rod with an eccentric disc which is driven by belt gearing or by
hand.
The second cylinder of the apparatus contains the piston which carries the
needle or is connected with the other tool which may be employed.
The needle may either be attached to the piston of the second cylinder or
arranged in such a manner as to be removable, so that in case of breakage it can
be easily replaced by another.

page_text: In order to set the apparatus in operation the eccentric disc herein before
mentioned, is rotated and by that means the piston of the first cylinder is caused
to move up and down. On the upstroke of the piston the air contained between
the two pistons in the cylinders and in the tube connecting them is compressed,
so that the pressure of the same pushes outwards the piston of the second
cylinder and the needle carried by it. On the return of the first piston the air
which was previously compressed, expands, so that the needle piston is sucked
back, or returned by the pressure of the outer atmosphere. A stop disc which
may be adjusted by means of a screw, limits the return movement of the needle
carrying piston. At each successive movement of the first piston the entire
operation recommences so that the needle is kept continually oscillating in the
direction of its longitudinal axis. A skeleton frame which has a ring at the bottom,
and which may be adjusted on, and attached to the needle cylinder serves to
guide the latter over the sheet of paper, which is to be perforated.
As already mentioned the needle may be replaced by any other suitable tool,
only some slight modifications being necessary for this purpose.
By means of suitable arrangements the apparatus-can be made to operate an
instrument for dental purposes, a perforator for photographic uses, a spring
perforator for lithographic purposes and the like.
$
The up and down motion of the piston in the second or tool cylinder may
also be utilized for rotating a borer.
Dated this 8th day of November 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Operating Piercing, Cutting,
Boring, or other like Tools by Means of Air Pressure.
A communication by ROBERT PRITSCH, of 7, Handgasse, Würzburg, in the
Empire of Germany, Mechanic.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion and in what manner the saine is to be performed, to be particularly described
and ascertained in and by the following statement :-
So-called pneumatic spring copying devices have hitherto been employed in
which a needle. is alternately driven by means of compressed air against the
Burface of a piece of paper, and again drawn back from the same by means of a
spring. The air employed in this case is enclosed between two membranes
which are stretched over two cylinders which are independent of one another but
are connected by means of a tube, one of these membranes being moved inwards
at short intervals of time by means of a mechanically operated piston, and
thereby the air contained is compressed. This pressure is communicated by the
enclosed air to the other membrane, which thereupon makes a movement outward
and by this movement operates a needle. As soon as the pressure of the piston
on the first membrane ceases, a counter spring connected with the needle returns
the whole mechanism, that is to say, the needle, and both membranes, together
with the enclosed air, to their original position.
.
This mode of working was a very uncertain and inconvenient one, owing to the
use of membranes on the one hand and a spring on the other.
In the invention which forms the object of this Application, membranes and
other intermediate parts, as well as the spring, are dispensed with, and by this

page_text: improved device, it is not only possible to operate a needle or other like
perforating appliance, but also any other suitable tool such as a borer, cutter or
the like.
In carrying out this invention, two or more closed cylinders are employed,
arranged separate from one another but connected by means of a closed air pipe,
and in each of these cylinders a piston is moved up and down. In one of these
cylinders this is done by mechanical means, in the other, which is connected with
the first by an india-rubber tube, by means of air pressure. A needle or other
suitable tool is connected with the second piston, and is set in operation when the
first piston moves under the action of the mechanical means employed for
operating it.
On the accompanying drawing: :-
Figure 1 is a sectional elevation of a complete apparatus.
I
Figure 2 is a vertical section of a cylinder and piston holding a tool for dental
purposes.
Figure 3 shows the use of a perforating pin.
Figure 4, shows the application of the invention to a dotting pen.
Figure 5 shows an arrangement for utilising the up and down movement of the
piston in the cylinder of the tool, for rotating a borer.
Different kinds of tools can be operated in this way.
The cylinder a, which contains the piston which is operated mechanically, is
mounted on a suitable stand b, which stand also carries the
mechanism.
piston operating
A piston c travels, as already stated, in this cylinder a, and is connected, by
means of its connecting rod, with an eccentric disc e which is driven by belt
gearing or by hand.
The second cylinder of the apparatus contains the piston which carries the
needle or is connected with the other tool which may be employed.
The needle may either be attached to the piston h of the second cylinder or
arranged in such a manner as to be removable, so that, in case of breakage, it can
be easily replaced by another.
In order to set the apparatus in operation, the eccentric disc e, herein before
mentioned, is rotated, and by that means the piston c of the first cylinder is
caused to move up and down. On the upstroke of the piston, the air contained
between the two pistons c and in the cylinders and in the tube connecting them
is compressed, so that the pressure of the same pushes outwards the piston h of
the second cylinder and the needle carried by it. On the return of the piston c,
the air, which was previously compressed, expands, so that the needle piston is
sucked back, or returned by the pressure of the outer atmosphere. A stop disc P,
which may be adjusted by means of a screw, limits the return movement of the
needle carrying piston. At each successive movement of the piston c, the entire
operation recommences, so that the needle is kept continually oscillating in the
direction of its longitudinal axis. A skeleton frame i, which has a ring k at the
bottom and which may be adjustably attached to the needle cylinder, serves to
guide the latter over the sheet of paper which is to be perforated.
As already mentioned, the needle may be replaced by any other suitable tool,
only some slight modifications being necessary for this purpose.
By means of suitable arrangements, the apparatus can be made to operate an
instrument for dental purposes, a spring perforator, a dotting pen for lithographic
& other purposes.
a
When used for lithographic purposes & the like, a rod m, Figure 4, connected
with the piston h acts on an arm n which is attached by hinge o to the cylinder
or to an elbow- or angle-piece of the same. The small pen q is removably
mounted on the arm n. It is thus quite evident that on the reciprocation of the
piston thro' the pulsations of the air in the tube an oscillation of the arm n on
the hinge o will take place. The pen is thereby also caused to oscillate so that it
makes dots on the surface of the drawing or other article used.

page_text: The up and down motion of the piston in the second or tool cylinder may also
be utilised for rotating a boring tool, as shown in Figure 5.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is-
The improved apparatus for operating a perforating cutting, boring or like tool
by means of air pressure, consisting in the arrangement by which the air
compressed in a stationary cylinder (a) by the movement of a travelling piston (c)
operates, by means of a connecting tube, a piston (4) moving in a second trans-
portable or hand cylinder and suitably connected with the tool employed, this
second piston, on the return movement of the first one, also making a return
movement by reason of the rarefaction of the air thereby produced; substantially
as herein before described and shown on the accompanying drawing.
Dated thi 21
WM. P. THOMPSON & Co.,
Agents.