Improvements in or relating to Phonographs.
Year: 1899

page_text: Date of Application, 2nd Oct., 1899-Accepted, 11th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Phonographs.
I, LOUIS WOLFF of 34, Ansbacherstrasse, Berlin, in the Empire of Germany,
Manufacturer, 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 a core for phonograph cylinders and has for its
object to make the same core applicable both for receiving cylindrical and also
conical or tapering cylinder casings. The invention consists in providing a
cylindrical roller core with removable insertions or projections forming expand-
ing pieces of such different heights that at one end of the roller core they pro-
ject more beyond the periphery of the same than at the other, and thereby afford
suitable places or points of support for a conical or tapering cylinder casing,
whilst on the removal of these insertions or projections the core is rendered
suitable for receiving cylindrical roller casings.
In the accompanying drawings, Figures 1 to 5 show some different forms of
construction of this improved roller core each in longitudinal and end view.
In Figure 1 the roller core a is provided with a number of longitudinal
grooves of any suitable shape running parallel to the axis and of equal depth
along their entire extent, in which grooves wedge shaped bars or laths c also
of any suitable shape are inserted, the height of which bars increases from one
end of the roller core to the other, so that they form tapering ribs on the
cylindrical roller core a, which ribs serve as points of support for the tapering
cylinder casing d. Preferably the bars c are made of vulcanite or the like which
maintain themselves automatically in the grooves 6 so that these latter may have
a rectangular section, but the grooves may also be formed with a dove tail section
as is shown with one of them in the cross sectional figure.
In Figure 2 the longitudinal grooves b run obliquely from one end of the
roller core to the other, and the bars care of the same size along their entire
length, so that the same action is obtained as described in Figure 1.
In Figure 3 the roller core a is provided with two transverse annular grooves e
which are both of equal depth. In order to adapt the roller core c for a tapering
or conical cylinder casing, an annular bar f is inserted in each annular groove,
one of which insertions is lower than the other, so that the roller casing obtains
suitable points of support. In Figure 4 vice versa, one annular groove e is deeper
than the other, and the two insertions f are of equal height, thus producing the
same result as that attained in Figure 3.
The bars of Figures 1 and 2 and the insertions of of Figures 3 and 4, and
also the grooves b and e may be composed of several separate parts which need
not be continuous, that is to say, instead of longitudinal grooves b and hars c
running the whole length of the core, as shown in Figures 1 and 2. and grooves e
and rings f running all round the core as shown in Figures 3 and 4, only parts
of these grooves, bars or rings may be employed.
Figure 5 shows a form of construction in which the roller core has no grooves,
and in order to adapt the same for a tapering cylinder either single projections a
of suitable form are fastened on the core a in any suitable manner, or rings or

page_text: bands are placed round the same, which additional projections are of suitably
different heights at the two ends of the core a.
In the forms of construction shown in Figures 3, 4 and 5, if desired only one
insertion projection forming the expanding piece may be employed at the
larger end of the roller, and those at the narrower end may be omitted, the
cylinder casing d at the narrower end being allowed to rest directly on the
respective end of the cylindrical roller core a.
As shown in Figure 6, the insertions or projections may be arranged obliquely
on the roller core, instead of in a longitudinal or transverse direction, or they
may run obliquely, as shown in Figure 7, or be arranged in any other suitable
shape.
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:―
+
A core for phonograph cylinders or the like adapted for receiving both cylin-
drical and also tapering cylinder casings characterised by the provision of remov-
able expanding pieces of suitable form and arrangement on the periphery
of the cylindrical roller core whereby in the case of tapering cylinder casings,
said expanding pieces which may project at different heights beyond the
periphery of the core fit themselves to the tapering cylindrical casing, whilst
by the removal of these expanding pieces from the cylindrical core, the latter
may be used for receiving a cylindrical or non tapering cylinder casing sub-
stantially as herein before described and shown in the accompanying drawings.
Dated this 30th day of September 1899.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.