Improvements in and relating to Tubes chiefly designed for Pen-holders.
Year: 1892

page_text: Date of Application, 22nd June, 1892-Accepted, 23rd July, 1892
COMPLETE SPECIFICATION.
Improvements in and relating to Tubes chiefly designed for
Pen-holders.
I RUDOLF BLANCKERTZ proprietor of the firm of Heintze and Blanckertz,
Steel Pen Manufactory, of 44, Georgenkirchstrasse, Berlin, in the Empire of
Germany, 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 :-
My invention relates to tubes chiefly designed for pen-holders.
In the manufacture of pen-holders use is generally made of closed tubes and
slit or open tubes. The former are drawn from a piece of metal, and the latter
are produced by bending a small piece of sheet metal on a mandrel. The slit or
open tubes are much cheaper and may be made of various metals, whereas the
drawing of the tubes is expensive and is almost without exception limited to the
employment of brass sheet as raw material. The closed tube is more durable
than the slit or open tube because it cannot be bent open. Now in order to render
the slit or open tubes equally durable I use locking devices for preventing the
widening of the tube.
The arrangement of these locking devices is illustrated in the accompanying
drawing.
Figures 1, 5, 7 and 9 show tubes thus made applied to pen-holders, Figures 2
to 4 represent details and Figures 6, 8, 10 are sections on the lines I-II, III-IV,
and V-VI, of Figures 5, 7 and 9.
Into the slit or open tube A. Figure 2 are inserted at both extremities smaller
tubes B1 and B2, Figures 3 and 4, which, like the outer tube, are made of sheet
metal bent. on a mandrel. These inner tubes are so slid into the outer tube,
Figures 5 and 6, that the slots will be opposite each other. Then both parts, at
the point where the outer tube presents the slot, are perforated in such a manner
that on one side of the hole the metal will not be cut through so as to form small
lugs which engage with each other similarly to hooks. The most suitable form for
the hole is an equilateral triangle as represented in the drawing. Here the apex
of the triangles F' F' coincides with the slot in the outer tube A. so that two small
triangular lugs on the outer tube will be above the piece M cut out of the inner
tube, and these lugs together with the said piece are bent into the interior of the
tubes. In this manner the inner tubes B¹ B2 are firmly connected with the outer
tube A. A slit or open tube which is thus secured or locked at both extremities
will be almost as durable as a drawn closed tube.
Such tubes may be employed for numerous purposes and are especially adapted
for use as pen holder tubes, if at one end a piece forming a spring for clamping
the writing pen is inserted.
I may insert any suitable piece into the outer tube or use one of the inner tubes
for this purpose. In the latter case the inner tube B¹ is prolonged so that, as
shown in the drawing, its lips a protrude from the outer tube. The writing pen is
slid between the outer tube A and inner tube B¹ and clamped by the latter.
If the pen holder tube is not very long a single stiffening tube will often be
sufficient, which tube may at the same time serve for clamping the pen in the
above described manner.
The lugs forced through the two tubes may at the same time serve to fix the
tubes to a wooden holder as shown in Figure 1.
In the arrangement illustrated in Figures 9 and 10 a short double tube produced
as above described is fixed as a protecting tube upon the lower end of a wooden
pen holder, the pen being inserted into a central opening d.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is...
1st. A longitudinally slit tube for the manufacture of writing pen holders and the.
like, which is stiffened and at the same time kept closed by pushing one or more
slit or closed tubes or rings into the same so that they cover the slot in the outer
tube, and by punching one or more lugs, which are separated by the slot in the
outer tube, through the latter and the inner tube or ring."
2nd. A writing pen holder tube in which a stiffening tube or ring inserted into
the same in the above described manner serves for holding the steel pen.
3rd. In pen holders a double tube made in the above described manner to serve
as a protecting tube, Figures 8 and 9.
Dated this 22nd day of June 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.