Improvements in Self Detaching Hooks for Winding Purposes.
Year: 1897

page_text: Date of Application, 9th Jan., 1897-Accepted, 13th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in Self Detaching Hooks for Winding Purposes.
I, STEPHEN HUMBLE, of Westminster Chambers, 9, Victoria Street, West-
minster, in the County of Middlesex, Engineer, 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 :-
My invention relates to self detaching hooks such as are already known, for the
attachment of shaft cages or the like to the winding ropes or chains, and consists of
improvements in the construction and form of such hooks to avoid what has
bitherto been a recognized weakness and danger in the said hooks.
"
Such self detaching hooks are usually of the form of two or more plate hooks,
right and left handed, with the gabs or jaws of the hooks passing side by side over**
the shackle of the winding rope or chain. The said plate hooks are pivotted
between two side plates forming the body of the hook and carrying the lower
shackle for the attachment of the cage, it having been found that such plate hooks
when formed from a plate of uniform thickness tend to be weak and liable to.
fracture through the neck of the jaw or gab of the hook.
By my improved construction of such hook I form the upper part of said hooks.
with double lateral thickness, preferably by forging or stamping the said hook with
the required checks from the solid, such increase of metal in the upper part of the
hooks affording a useful counterbalance to the lower part of the said hooks to.
determine their instant operation when struck by the safety plate, and at the same
time the excess of weight at the upper part of the hooks is not so great as to tend
to cause the books to fall outwards and disengage by the mere slackening of the
hauling rope which would be a serious disadvantage.
At the same time I effect this strengthening of the upper part of hooks around
the gabs or jams of the hooks, without interfering with the continuity of the-
external plates of the hook, which I consider to be of importance, as these latter,.
when thus maintained in their integrity, form guides entirely protecting the inner
hooks as they pass through the orifice of the safety catch preventing the hook from
jamming the heads of the internal pivotted hooks from striking the said catch plate
and also act as a perfect guide to the shackle when released.
And in order that my invention may be the better understood, I now proceed to.
describe the same reference being had to the drawings hereto annexed and to the
letters and figures marked thereon.
Figs. 1 and 2 are an end and side elevation of my improved hook.
Fig. 3 is a general elevation showing the said hooks made up with the side.
plates, and their mode of action on striking the safety catch plate.
Fig. 4 is a plan of the same.
A. A' are my right and left handed improved hooks, with a lateral thickened
piece B B' formed preferably solid with the body of the hook, about the weakest.
part of the neck of the jaw or gab C of the said books. It is important that the
upper part of the said gab or jaw C should be brought over beyond the centre of
the shackle pin with an engaging curve a.
D is the upper shackle of the winding rope or wire, E is the lower shackle for
the attachment of the cage or other weight lifted. E. E, are the external side
plates of the hook, still retained to completely cover and protect the internal hooks.
and forming continuous guides through the orifice of the safety catch plate F and
also perfect guides for the shackle pin D when released as shown.

page_text: The opening and disengaging action of the hooks A and A¹ with the release of
the winding shackle D and the catching of the projecting wings e. e, upon the safety
catch plate F, when the hook has been drawn to its full extent through the said
catch plate, is shown in Fig. 3, but as the mode of operation of such safety hooks is
already well-known I need not further describe the same.
It is to be observed that in order to maintain the outer side plates E. E, in their
integrity as heretofore, I form the lateral strengthening pieces B B' upon the right
and left handed hooks A A' in such a manner as to utilize the whole of the space
between the said side plates E. E, for the heads of the said strengthened hooks,
which I cause to lap over one another when closed after the manner of a scarf
joint as seen in Fig. 4.
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 :--
1st. In a safety hook device the strengthening of the heads of the operative
pivotted hooks by lateral cheeks about the neck of the jaw or gab of the said hooks
such cheeks being adapted to the said hooks so as to lie and play between the side
plates of the said hook and to lap one upon the other, when closed, similar to a
scarfed joint substantially as described and illustrated herewith.
Dated this 8th day of January 1897
FELL & JAMES,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.