An Improved Method of Securing Hair Springs in Collets and in Collets for the Purpose.
Year: 1886

page_text: An Improved Method of Securing Hair Springs in Collets and in
Collets for the Purpose.
I HENRY GARDNER of 166 Fleet Street, City of London, Patent Agent, do hereby
declare the nature of this invention to be as follows:-
According to the present method pins are used for fastening Hair springs to their
collets and it has been found that not only is the collet thrown out of its centre but it
also necessitates the springs being trued both in the round and in the Hat.
The object of the present invention, is to obviate the above disadvantages by dis-
pensing with the pinning whereby the Hair spring is trued mechanically by the
fastening method and is less liable to get out of shape. This is effected by grooving
the rim or periphery of the collet which groove is just wide enough to admit the hair
spring and a trifle deeper than the hair spring is thick. It is into this groove that
the inner coil of the hair spring is sprung the tension of the spring being sufficient.
to firmly bind itself into contact therewith, but a hole may be formed at one part of
the collets periphery into which the bent end of the inner coil of the spring (if bent)
can lodge itself and assist in the fixture or the collet may be burred down if necessary
to prevent the spring slipping.

page_text: COMPLETE SPECIFICATION.
An Improved Method of Securing Hair Springs in Collets and in
Collets for the Purpose.
I HENRY GARDNER, of 166, Fleet Street, city of London, Patent Agent, do hereby
declare the nature of this invention which has been communicated to me from abroad
by Edward Hunziker Importer of 64 Nassau Street, New York, U.S.A. and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
According to the present method, pins are used for fastening Hair springs to their
collets, and it has been found, that, not only is the collet thrown out of its centre, but
it also necessitates the springs being trued, both in the round and in the flat.
The object of the present invention is to obviate the above disadvantages, by dis-
pensing with the pinning, whereby the Hair spring is trued mechanically by the
fastening method and is less liable to get out of shape. This is effected by grooving
the rim or periphery of the collet, which groove is just wide enough to admit the hair
spring and a trifle deeper than the hair spring is thick.
The invention will be clearly understood by reference to the annexed drawings, in
which Figure 1 represents a hair spring a and Figure 2 a hair spring collet & having
in its periphery a groove c. It is into this groove c that the inner coil of the hair
spring a is sprung, the tension of the spring being sufficient to firmly bind itself into
contact therewith, (as shown at Figures 3 and 4) but a hole d may be formed in the
groove c, at one part of the collets periphery into which the bent end e of the inner
coil of the spring a (if bent) can lodge itself and assist in the fixture, or the collet may
be burred down if necessary to prevent the spring slipping.
Figure 5 represents a collet with hole d in the groove e in its periphery and
Figure 6 shows a hair spring a with the bent end e of its inner coil lodged in the
hole d of the collet.
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 method of fastening hair springs to collets as and for the purposes
described, and substantially as shown on the annexed drawings.
2. Grooving the rim or periphery of hair spring collets in the manner set forth and
for the purposes described, whereby the usual pinning and "trueing" of the spring
are dispensed with.