Improvements in Self Detaching Hooks for Shaft Cages.
Year: 1896

page_text: Date of Application, 19th Oct., 1896-Accepted, 21st Nov., 1896
COMPLETE SPECIFICATION.
Improvements in Self Detaching Hooks for Shaft Cages.
We, EDWARD GASCOIGNE WEDDELL, Engineer, of Castle Road, Tipton Green, in
the County of Stafford, and JOHN GEORGE CHAMBERLAIN, Engineer, of 1 York
Road, Edgbaston, Birmingham, in the County of Warwick, 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 :-
C
In the Specifications No. 1105 of 1879 and No. 3021 of 1882 are described
ching hooks for preventing shaft cages from being overhauled, these hooks
'sting each of a pair of blades pivotted together and so arranged that on the
hc passing partly through a circular hole in a catch plate fixed to the girder
struire at the top of the shaft, these two blades are caused to spread apart at the
top so as to allow withdrawal of the hauling shackle, and at the same time to
protrude projections over the sides of the opening to support the cage when it
is no longer held by the hauling rope. Our present invention relates to an improved
construction of detaching hooks of this kind as we shall describe referring to the
accompanying drawings.
Figuro 1 is a side view shewing the hook closed, in condition for hauling.
Figure 2 is a side view shewing tho hook opened and resting on the catch plato.
Figure 3 is a plan, Figure 4 is a front view, and Figure 5 is an edgo view of
ono of the shear plates.
The hook consists of two external equal and similar side plates A A¹ and of two
internal equal and similar shear plates B B all of which are pivotted together by a pin C.
The side plates A A' are fixed together at the bottom by a triangular piece T which
forms a stop; each besides the hole for the pin Chas in its lower part a hole a by
which the cage is suspended from the hook and on each side a projecting ear.
At its upper part it has a slot a², a part a shaped as a circular are struck from
the centre of the pin, and an upwardly projecting part a. Each shear plate B B',
has a hole for the pin C, at its lower part it has on the one side an outwardly and
downwardly sloping limb b, on the opposite side somewhat higher up a shoulder b¹,
above the pin hole an inclined slot ; its head is book shaped having a part
projecting over a hole & open on one
strengthened by being made of triple
terminating below in a circular arc
terminating above in a straight face
thickened part on the other side has
indicated by the dotted lines 7.
side, and the upper part above the hole is
thickness, the thickened part on the one side
struck from the centre of the pin hole, and
a little behind the straight face of 6; the
two straight faces inclined to each other as
When the parts are pivolted together and in the position shewn in Figure 1,
the cage hanging by a shackle or chain pin passed through the holes a of the side
plates, and by a shackle pin passed through the hole D formed by the meeting of
the upper parts of the shear plates B B', then the sloping limbs 6 project outwards
on each side, while the shoulders & are within the side plates. In ordinary working,
the parts are held in this condition by a copper rivet Z passed through coincident
holes of all the plates.
When the cage is hauled so far up that the book is passing up through the
circular hole in the catch plate, this hole being just sufficiently wide to let the upper
part of the hook pass, then, as the hook still ascends, the sides of the circular hole
acting on and pushing inwards the sloping limbs b, cause the shear plates to open

page_text: apart at the top shearing the rivet Z, so that they present, instead of the hole D.
a slot open at the top through which the pin of the hauling shackle is withdrawn.
but by the movement of the shear plates as far inwan is permitted by the
stop T, their shoulders 6' are made to project over the sides of the circular hole, so
that the hook, though detached from the hauling rope now sts by these shoulders
on the catch plate. In this condition, while the hook is s led on the catch
plate the slots of the shear plates and the slots a' of the
coincidence in their lower parts, a shackle pin is passed thro
the cage is slightly raised. This closes in the shear blades and
that the cage can be lowered to rest on the stage. A fresh rivet."
lifting shackle is connected and the hook is then ready for work.
The projecting ears a¹ of the side plates act as stops preventing
being hauled up through the hook plate.
ates being in
ti
Having now particularly described and ascertained the nature of th
tion and in what manner the same is to be performed I declare th
claim is :-
se parts and
ulders
so
nserted, the
ook from
:
A self detaching hook consisting of two side plates, and two shear plates
together, the said plates being shaped, substantially as described for the I
set forth.
Dated this 19th day of October 1896.