Improvements in Spools.
Year: 1892

page_text: Date of Application, 26th Jan., 1892-Accepted, 27th Feb., 1892
COMPLETE SPECIFICATION.
Improvements in Spools.
I CARL BACK of 4 Lambrecht Strasse 14 Vienna in the Empire of Austria,
Merchant 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 spools which are particularly light, simple, and cheap,
and which are especially suitable for winding very thin threads (silk and floss-silk)
or narrow ribbons. These spools may be made so as to have the appearance of
being full even when carrying only a comparatively short length of thread.
According to this invention, these spools consist of two cupped discs placed
back to back and united at their projecting middle parts by glue or by means of
an eyelet.
The accompanying sheet of drawings illustrates several varieties of said spools.
Figure 1 is a section of one of the cupped discs, the combination of two such discs
constituting the spool.
Figure 2 is a section of a spool composed of two cupped discs glued together.
Figures 3 and 4 are a section and side elevation of a spool, the two constituent
discs of which are united together by means of an eyelet.
Figures 5 to 9 represent other varieties of the improved spools.
The discs A are preferably made by pressing or stamping out sheets of paper or
of pasteboard and, in order to make them as light as possible and to enable the use.
of very thin material for their manufacture, they may have their marginal portions
grooved or strengthened by circular ribs.
As shewn in Figures to 6 of the drawings each disc has its central portion
stamped or pressed up to a cupped form the marginal flange or rim a' being bent
backwards, as shewn in Figures 1 to 5, or forwards, as shewn in Figure 6, or the
whole disc may be capped or brought to the shape of a spherical calotte, as shewn
in Figure 7. Two of these cupped discs are placed back to back and their middle
projecting parts or bosses a² are glued together or united by means of an eyelet / so
as to leave between the two rims a¹ a space for containing the thread or ribbon.
Each of the two bosses a² is provided with a circular shoulder e pressed in or out
of the same, and between these two shoulders is inserted a paper strip & enveloping
the two bosses a² so as to cover the joint between them and form a smooth surface
for the thread or ribbon to be wound on.
When the discs have the shape of spherical calottes, the boss a' may be formed
by stamping up the middle part abruptly, as in Figure 6, and in that case the paper
strip may rest on the shoulder c¹ thus formed
The paper strip may be replaced by thick glue, paste, or other material suitable
for filling in the joint between the two discs A as illustrated, for instance, at din
Figure 7. A core is thus formed suitable for receiving the thread or ribbon which
is to be wound on it, the diameter of said core being perfectly independent of the
eyelet or of the diameter of the spindle inserted in the eyelet or in the central
aperture a (Figure 2). The diameter of the said core and consequently the
dimensions of the space for the reception of the thread, may be varied at will by
varying the width of the marginal rims a' of the cupped discs.
The discs are usually, but not necessarily, of circular form as in some cases the
spools thus constructed may be made of an oval, instead of a circular, shape as shewn
in section and elevation in Figures 8 and 9.
If it is desired that the spool, even when carrying but a comparatively small
length of thread, should present the appearance of being full, the hollows or cups

page_text: formed by the stamping-in of the parts a² are closed by affixing over them a label f,
as shown in Figure 5.
Simultaneously with the stamping up of the discs any desired letters, inscriptions,
or trade-marks, may be impressed in them as illustrated, for instance, in Figure 4.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what I
claim is;
A spool composed of two cupped discs A the bosses or projecting middle parts a²
of which are glued together or united by an eyelet, the core of the spool being
formed either by a paper strip d surrounding the annular shoulders e of the parts a²
or by a filling-in mass d' covering the joint between said parts, the diameter of the
aforesaid core depending on that of the bosses or central cupped portions a² and
being proportioned to the length of the thread to be wound thereon.
Dated this 26th day of January 1892.
CARL BACK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.