Improvements in Hooks for Watch-chains and the like.
Year: 1899

page_text: Date of Application, 14th Oct., 1899-Accepted, 16th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Hooks for Watch-chains and the like.
I, WILHELM GRÖZINGER, of Gmünd, in the Empire of Wurtemberg and
Kingdom of Germany, Chain Maker, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
The object of the present application is a hook with bayonet catch for watch-
chains, but which is also adapted for all those purposes for which a secure and
yet tolerably easy fastening is required. Over the carbine" hooks with spring
catches hitherto in use it has the advantage of shutting more firmly, and it will
bear being pulled hard without injury or a portion breaking off as both ends
of the loop have a firm support.
A hook of this description is illustrated in the accompanying drawing in
which;
Figure 1 shows a view of the hook opened with the sheath in section.
Figure 2 a view of the hook when closed.
Figure 3 shows the under part of the sheath.
Figure 4 is a section on the line A-A of Fig. 2.
Figure 5 illustrates a constructional modification of the hook when opened,
and
Figure 6 the same when closed.
The hook consists of a wire loop a one end of which is fastened to a ring b.
The other end of the loop is formed as a catch c made by cutting out a notch d.
The end of the catch e is prferably sloped off or wedge-shaped as shown in
Figure 1.
Over the loop a is placed a conical sheath or socket e which has a rimmed
edge f having a recess g. This recess is preferably round.
The edge with its recess in combination with the catch is intended to
form a bayonet catch for the hook, while the sheath e by means of the recess g
is turned over the catch cand twisted against it in such a manner that the
edge f engages in the notch d (see Figure 2). The end c of the loop a is con-
sequently firmly seated in the sheath. Owing to the shape of the loop a and
the elasticity occasioned thereby, the sheath is so firmly fixed that it is difficult
for the hook to open of itself. The automatic opening thereof can however be
entirely prevented by pressing that part of the loop a which is opposite to tne
catch into the recess g when twisting round the sheath e (see Figure 4).
The hook can however be opened when the sheath is twisted so far towards
the loop a as to disengage the catch c from the sheath e by means of the
recess g.
The insertion of the end of the loop into the sheath is facilitated on the one
hand by sharpening the edge of the sheath at the point of the recess g, and on
the other hand by the wedge-shaped rounding off of the catch c.
The loop and also the sheath can be of various sizes and shapes. In the
modification illustrated in Figures 5 and 6 for example, the loop is in the shape
of a ring and the sheath e more like a cap. In order to prevent the sheath

page_text: slipping off the loop or becoming lost, it is preferably provided with a projection h
which. when the loop is closed (Figure 6) is situated inside the sheath and is
not visible from outside.
While the hook is chiefly used as in Figures 1 and 2 for attaching the watch
to the watch chain, the example illustrated in Figures 5 and 6 is also well
In order to be able to
adapted for a ring for fastening the chain to the vest.
turn the sheath conveniently, the outside thereof can be fluted.
The durability and strength of this kind of hook is chiefly due to the loop
being in one piece and both of its ends having a firm seat which prevents it
being torn or broken away which sometimes occurred with the spring hooks
hitherto in use.
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
1. Improved hook characterised by a bayonet fastening of the free end of
the loop in a sheath or socket e revolubly placed over the loop of the said hook.
2. A hook for watch-chains and the like as set forth in Claim 1, characterized
by the free end of the loop being formed as a catch c and the sheath e which
turns round the loop a having a rim f with a recess 9, which forms a seat for
the catch c.
3. A hook for watch chains and the like as characterized in Claim 1 in which
the recess g of the edge f of the sheath e is rounded, in order to be able to
easily withdraw the loop a when the sheath e is turned round.
4. A hook for watch-chains and the like as set forth in Claim 1 in which the
loop is provided with a projection in order to prevent the loop slipping off
or becoming lost, substantially as described with reference to the accompanying
drawings.
Dated the 13th day of Uctober 1
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.