Improvements in Pipe and Bar Cutters.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pipe and Bar Cutters.
I, EMIL BERGER, of Arad in the Kingdom of Hungary, Engineer, do hereby
declare the nature of my said invention to be as follows:-
This invention relates to an improved cutter, by means of which pipes, bars,
shafts and the like of any material may be cut by hand, without much power being
necessary, the cut being made at right angles to the axis of the pipe or shaft in
such manner that no finishing of the cut part is necessary.
This cutter consists essentially of a curved arm having a stationary jaw at the
one end and a collar at the other, through which latter passes a screw spindle
connected to and operating a blade-carrier sliding on said curved arm and provided
with jaws; on turning said spindle, therefore, the article to be cut is clamped
between said stationary and the sliding jaw of the blade carrier. Between said
collar and blade carrier is arranged on said spindle an elastic buffer or spiral
spring by means of which the pressure exerted by the spindle on the article being
cut by the blade mounted on said blade carrier, is equalized, this being effected
by a nut on said spindle and provided with projections or recesses for engaging
with like parts on a stationary collar likewise mounted on the spindle.
This improved cutter is operated in the usual manner, viz. by moving or turning
same (by means of the free end of said spindle) round the article clamped between
the jaws.
It will be evident that for reducing the friction, rollers may be provided in
said jaws, that the cutting blade may be substituted by a cutting roller and, finally,
that the buffer or spring may be arranged directly on the curved arm forming the
cutter instead of on the screw-spindle.
Dated this 15th day of February 1895.
A. F. SPOONER,
124 Chancery Lane, W.C., Agent for the Applicant.
Improvements in Pipe and Bar Cutters.
I, EMIL BERGER, of Arad, in the Kingdom of Hungary, Engineer, do hereby
declare the nature of my said 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 a cutter by means of which pipes, bars, shafts and the like
may be cut by hand without the exertion of much force, the cut being made at
right angles to the axis of the pipe or shaft in such a manner that no finishing of
the severed parts will be necessary.
I will now describe my invention with reference to the accompanying drawing,
in which
Fig. 1 shows the cutter partly in vertical section,
Figures 2 and 4 show respectively left and right handed sections on the line -

page_text: Fig. 3 is a plan partly in section (with some of the parts removed) showing my
improved cutting tool.
a is a curved arm having at one end a stationary jaw 6 and at the other a
screw-threaded collare through which a correspondingly screw-threaded spindle d
passes and acts, by means of an elastic buffer h, spring, or equivalent device,
enclosed in a casing on sliding jaws i carrying a blade or cutter-holder e. The
article to be cut (as indicated in dotted lines at K) is clamped between the
jaws b, i.
The screw-threaded spindle d is so connected to the blade-carrier e preferably
by means of a circumferential groove and pin, or in any other convenient manner,
as to be free to rotate therein and thus, on turning the said screw-threaded
spindle d so as to screw it into the collare the whole carriage, comprising the
blade or cutter-carrier e, the blade or cutter f and the jaws i, can be fed or
advanced towards the article K to be cut.
The blade or cutter may be replaced by a cutting disc or roller if desired.
The cutter having been, as above described, properly adjusted relatively to the
tube or article to be operated upon, the tool is used in the usual manner; namely
by moving or turning the same round at right angles to the axis of the said tube
or article clamped between the jaws b, i. In order to reduce the friction as far
as possible during this operation, antifriction rollers 1, are preferably mounted
in the jaws band i.
. It will be seen that on continuing to turn the spindle d so as to bring the
movable or sliding jaws into closer proximity with the fixed or stationary jaw b,
and thus to more tightly clamp between them the article to be cut, the nut m_on
the spindle would be forced against the loose intermediate collar or washer 2,
and the elastic buffer would become abnormally compressed, thereby engendering
an undue amount of friction between the jaws and the article being cut by gripping
the latter too tightly.
In order to obviate this a projection or extension h³, which engages with, and
prevents the nut m from turning with the advancing spindle d may be provided
upon the casing h¹.
It will thus be seen that on the buffer being put under its
maximum compression and thus exerting its utmost force, the advancing spindle d
will screw through the said nut, and thus diminish the compression of the said
buffer or spring & due to the latter, so as to compensate for that caused by the
advance of the said spindle, and the pressure of the jaws i against the article to
be cut, and therefore to maintain the compression, and consequently the gripping
action due to the said spring or buffer, uniform during the whole operation of
cutting.
;
It will be evident that a spiral spring may be substituted for the elastic
buffer and also that the nut m and loose collar or washer ² may be formed
in one piece, in which latter case the friction between the parts will be usually
found sufficient to prevent the buffer from being unduly compressed and the
extension can therefore be dispensed with.
In some cases it is found convenient to limit the movement of the nut m by
a projection or adjustable clamp on the arm a. The elastic buffer or spiral
spring moreover may be arranged in connection with the jaw b instead of the
ones i as hereinbefore described.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a cutter for pipes, bars, shafts and the like, stationary jaw (b) and
sfiding jaws (i), the latter carrying the blade-carrier and the blade (f) and being
advanced by the spindle (d) towards the article to be cut, substantially as
described and shown in the drawing.
2. In a cutter of the kind set forth in Claim 1, an elastic buffer (h) (or spiral
spring) enclosed in a casing (h¹), such buffer being put under, and maintained at

page_text: its maximum compression by the friction exerted respectively on the nut (m) ring,
or collar (2) and casing (h') by the advancing spindle (d), substantially as
described and shown in the drawing.
Dated this 26th day of October 1895.
A. F. SPOONER,
124, Chancery Lane, W.C., Agent for the Applicant.