and other Purposes.
Year: 1887

page_text: Date of Application, 20th June, 1887.
Specification Accepted, 22nd July, 1887.
and other Purposes.
I, IDA FRANZISKA CLASEN Merchant of 37 Muskauerstrasse 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 :—
The subject of the hereinafter described invention is a fastening for studs solitaires
sleeve links and other purposes to which it may be applicable which though releasable
does not permit of any automatic release of the fastening parts. The arrangement of
such a safety fastening is shown in Figures I & II in studs. Figures III & IV show
a second arrangement of stud fastening. Figures V & VI show another arrangement.
The essential part of the new fastening consists of the combination of a screw and a
wedge fastening and the invention is as follows:-The nut part & Fig. I and b¹
Fig. IV of the fastening is connected at the bottom with a plate c Fig. I & c¹ Fig. IV
set in the thread part and provided with a more or less sharp or projecting point so
that a small interval remains between the nut part b and the plate c and the nut part 61
and the plate c. The thread g Fig. II or g' Fig. III is made of elastic material and
runs out into several wings which when the thread part g or g¹ is screwed into the nut
part enter into the said intervals between the nut part b and the plate c and the nut
part and the plate c¹ respectively and thus bend outwards. In consequence of the
wedge action of the wings d d an automatic release of the screw is rendered impossible,
as in the automatic release only a slight pressure can prevail, on the other hand in
consequence of the elastic material of which the screws g or g¹ and the wings d or d¹
consist the fastening can very easily be unscrewed again by hand and in that way
released. Figures I & II & Figures III & IV show two fastenings of this sort in
the form of a sleeve stud in Figure I the nut part 6 is also surrounded with a special
covering a while in Figure IV the nut part 6' and the plate c¹ together form a similar
stud. Figures V & VI show a modification of the above principle. Here the screw e¹l
runs out or continues into spring catches d" which when screwed into the nut part 611
are forced against and catch under the button c¹¹ set in the centre thereof and thus

page_text: secure the fastening fromni automatic release. This fastening is opened again by
pressing some suitable article into the aperture of the screw part g" and thus forcing
the catches d away from the button e or else the catches d are made wedge-shaped
on both sides so that when greater pressure is applied than prevails in automatic
releasing they are forced away from the button c¹¹.
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 :—
(1). The improved safety screw fastenings consisting of a screw fastening bg or
bg in connection with the elastic wings dd on the screws gg' respectively which enter
and bend round in the spaces between the nut part 6 or 6 and the plate c or c¹
substantially as and for the purposes hereinbefore described and represented in
Figures I, II, III, and IV of the drawings annexed.
Also the improved safety screw fastening consisting of the screw fastening by
having the spring catches " on the screw e" which catch behind the button c on the
part a substantially as and for the purposes herein before described with reference to
Figures V and VI of the drawings hereto annexed.
(2). The improved fastenings constructed in the manner and for the purposes.
herein before described and represented in the drawings annexed.
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