Improved Spring-hook for Dog-chains, Pole-chains, and similar Appliances.
Year: 1897

page_text: Date of Application, 29th Jan., 1897-Accepted, 6th Mar., 1897
COMPLETE SPECIFICATION.
Improved Spring-hook for Dog-chains, Pole-chains, and similar
Appliances.
I, PETER BULL of Margaret Street Works, Green Lane, Walsall, in the
County of Staffordshire, Manufacturer, 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 an improved form and special construction of spring-
hook attachment for dog-chains, pole-chains of harness, straps and the like, and has
for,object to construct a spring-hook for the above purposes without drilling or
boring holes therein for the joint or the pivot of the short-side, thereby obtaining
increased strength and effecting economy in manufacture; and also having the
spring hidden and therefore protected from breakage by contact with the chain
or ring, as is liable in ordinary constructions.
I may make my improved hook with solid eyes,-round, square or oval,—either
to screw on the chain or ring, or to swivel for use with straps, leashes and the like.
In carrying out my invention I make my improved hook of steel, wrought-iron
or other suitable metal, with the short-side detachable and arranged to be kept
closed against the main part of the hook by the pressure of a spring secured
within the metal.
My invention will be more clearly understood by reference to the accompanying
drawings upon which—
Figure 1 is a side view partly in section of a spring-hook of my construction
provided with a solid eye, and shewn in the closed position;
Figure 2 being a similar view of the same in the open position, and—
Figure 3 is a side view of the same with the short-side shewn detached from the
main-part.
As will be seen from the drawings the spring-hook A, which may be of the
usual pear-shaped form, terminates at its narrow end in a solid eye B. The
short-side C is arranged to engage at one end in a recess D forined within
the narrow part of the hook, within which recess is provided a step or bar E
against which the end of the short-side is pressed by means of a spring F secured
in the recess, so as to normally retain the short-side therein and to keep it in the
closed position, but allowing it to open on pressure from the outside, or to be
entirely detached when desired.
For this purpose the short-side is made in the particular form shewn more
clearly on Figure 3, detached; having its inner end cut or curved on one side, G,
to engage and turn against the step or bar E which supersedes the ordinary pivot,
and its other side formed with a projecting inclined surface H upon which the
spring Fabuts. The other or outer extremity of the short-side C, which closes
against the hook A, is beveled and provided with a V-shaped or other suitable
groove to fit securely against the end of the hook which is made of corresponding
form.
It will be seen by this arrangement that the pressure of the spring F against the
inclined surface H of the short-side C keeps the latter normally closed against the
hook A, and holds its curved end G against the step or bar E which serves as a
pivot upon which the short-side is free to partly rotate.
To remove the short-side from the hook, pressure is exerted with the thumb

page_text: upon the part of the short-side nearest the narrow portion of the hook,―ie.-
nearest the fulcrum of short-side,-in an inward direction until it reaches such an
angle that it may be readily drawn away from, or pulled out of engagement with,
the step or bar E.
By adopting the construction described, all drilling of holes in the joint and
short-side is superseded, whereby weakness is avoided and economy in manu-
facture attained; at the same time the short-side being detachable renders the
hook more easily repairable, whilst the movable piece can at any time be replaced
if lost or damaged.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A spring-hook A having a detachable short-side C arranged to open against
the pressure of a spring F, said short-side being curved or recessed at its inner
end and turning against a step or bar E formed in the narrow part of the hook, for
the purposes and as described with reference to accompanying drawings.
2. In a spring-hook for dog-chains, pole-chains and the like, the particular
construction, in a continuous piece, of the hook A and open or solid eye B, in
combination with a detachable short-side C curved at its inner end, a step or bar
within the narrow part of the hook, and a spring wholly or partly contained in a
recess in such narrow part, for the purposes and as described with reference to
accompanying drawings.