Watch Fusee Chain-rivet Extractor.
Year: 1889

page_text: Date of Application, 20th Nov., 1889
Complete Specification Left, 31st July, 1890-Accepted, 20th Sept., 1890
PROVISIONAL
SPECIFICATION.
[Communicated from abroad by LouIS WILLIAM LUDWIG, Watchmaker, 103 Lambton
Quay, Wellington, New Zealand.]
Watch Fusee Chain-rivet Extractor.
JOSEPH FREDERICK LUDWIG Watchmaker, 8 Colestown Street Battersea London S.W.
do hereby declare the nature of this invention to be as follows:-
A tool designed for the use of watchmakers to supersede all existing methods for
extracting the rivets from broken watch fusee chains with safety and rapidity, con-
sisting of:
Two steel plates provided with a dove-tailed groove, and set at such an angle that
any sized chain from the smallest to the largest can readily be operated upon. The
two steel plates are screwed down to a brass block so shaped as to be firmly held in
the ordinary bench vice.
The modus operandi is as follows:-
"Insert the chain, broken link foremost, pressing it along the tapering groove as
far as possible, when it will be found to be securely held between the two dove-tailed
jaws and resting upon the bed. The rivet may then be forced through by means of a
punch or pusher.
In order to prevent "choking" the metal immediately below the bed is cut away
at an angle thus allowing the extracted rivets to fall out of their own weight, upon
the tool being tilted."
Dated this 20th day of November 1889.
COMPLETE SPECIFICATION.
Watch Fusee Chain-rivet Extractor.
I, JOSEPH FREDERICK LUDWIG, Watchmaker, 8 Colestown Street Battersea,
London S.W. 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 tool is designed for the use of watchmakers to enable them to repair broken
watch fusee chains without any risk of injury to the chain itself.
The principle consists in the arrangement of two steel blocks shaped (in a manner
hereinafter specified) so as to ensure that any fusee chain irrespective of its dimen-
sions will be held perfectly rigid while being operated upon.
Fig. 1 in the accompanying diagram presents a view of the tool in perspective ;
Fig. 2 in elevation whilst Fig. 3 gives a view of the plan.
K in Figs. 1 and 2 is a brass block so shaped as to be readily gripped in the
ordinary bench vice.
The two plates L L (Fig. 1) are of steel screwed on top of the brass block so as
to make a small angle with one another as at 001 (Fig. 3).
Each of these steel
plates have a gradually tapering groove II (Fig. 2) which together form a dovetail
the opening being larger at O and diminishing to a point at O¹.
A (Figs. 1 and 2) is a pusher fitted with a steel point.
Fig. 1 gives a view of the modus operandi. F is the broken chain from which
the rivets are to be extracted. The chain F is pressed along the dove-tailed groove
as far as possible. It will then be found to be held perfectly rigid and thus enabling
the operator to have both hands free to punch the rivet through by means of the
pusher A, without any risk of the chain proper becoming distorted or strained.

page_text: The two steel blocks are cut away immediately below the bed 11 at such an angle
that no "choking" can occur, as the extracted rivets will fall out by reason of their
own weight as soon as the tool is so tilted.
A glance at Figs. 1, 2 and 3 will shew clearly that by the shape and arrangement
of the steel blocks any chain irrespective of its size can be accommodated and held
perfectly secure upon the bed when pressed home.
The chain can then be withdrawn and rejointed.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. That the invention is an entirely new one.
2. That the principle upon which it is constructed is simple but effective.
3. That all risk of damage to the chain is entirely obviated.
4. That it is handy in form.