Improvements in Safety Links or Hooks for the Prevention of Accidents in Overwinding.
Year: 1898

page_text: Date of Application, 22nd Aug., 1898
Complete Specification Left, 25th Apr., 1899-Acoepted, 5th Aug., 1899
Improvements in Safety Links or Hooks for the Prevention of
Accidents in Overwinding.
We, ABBOTT. GODFREY LAKER, and WALTER WILLIAM ABBOTT LAKER, both of
Borrowash, Derby, Agents, do hereby declare the nature of this invention to be
as follows:-
This invention has reference to an improvement connected with safety hooks
or safety links to prevent accidents from overwinding of cages, hoists, buckets,
tubs, or stages and lifts in mines, pits, quarries, buildings, or other places, the
object being that when such safety hook or link is led through a circular hole in.
a safety plate or ring, parts of such safety hook or link will assume such a position
that the link or hook with its load is held suspended by the plate or ring, and the
parts of the hook or link are locked or fixed into position and into slots or grooves
of segmental shapes and drooping from the vertical central line outwardly,
thereby giving additional safety and securely suspending the load until it is
desired to release the hook or link.
Dated this 22nd day of August 1090.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Abbott Godfrey Laker, and
Walter William Abbott Laker.
Improvements in Safety Links or Hooks for the Prevention of
Accidents in Overwinding.
ABBOTT GODFREY LAKER, Agent, and WALTER WILLIAM ABBOTT LAKER, Clerk,
both of Borrowash, in the County of Derby, 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 has reference to an improved construction of safety hooks or
links to prevent accidents from overwinding of cages, buckets, tubs or stages in
pits mines, lifts hoists or quarries, or lifts in buildings or other places the object
of such invention being that when such safety hook or link is led through a circular
hole in a safety plate or ring or more than one safety plate or ring, such link or
safety hook will assume such a position that the link or hook is held suspended
by the catchplate or ring or catchplates or rings, and the parts of the hook or
link are locked or fixed into position, and are prevented from closing or falling
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page_text: '
back through the hole or ring by means of a bolt or bolts of suitable lengths and
thicknesses and either cylindrical or of other shape and of suitable material,
working into slots or grooves of special shapes, thereby giving additional safety,
and securely suspending the load until it is desired to release the hook or link,
and the parts of the hook or link are so proportioned and arranged as to cause as
little shock as may be to the safety ring or plate.
For the purpose of more fully explaining our invention, reference is hereinafter
had to the annexed sheets of drawings illustrative thereof.
Figure 1, shows the hook when closed.
Figure shows the hook when open and suspended upon the catchplate.
A Figure 1 shows the middle plate which carries the load suspended by a
shackle and shackle pin, which pin passes through the hole marked L.
A Figure 2 shows the same plate.
H Figures 1 and 2 shows a slot or groove in the middle plate A, into which the
upper shackle pin (which for simplicity in not shown) runs.
K Figures 1 and 2 shows, by the dotted lines, a vertical slot or groove in the
middle plate A, in which a locking bolt-E in Figures 1 and 2-works.
Figure 1 B, and Figure 2 B, are the moving jaws or cheeks, which, when they
are closed, secure and hold an upper shackle pin, which passes through the space
marked P Figure 1.
Figure 1 C, and Figure 2 C, show a corresponding jaw or cheek on the other
side of the middle plate A.
Figure 1 and 2 R and R are slots in the cheeks B and C respectively.
Figure 1 N and N¹, and Figure 2 N and N', show two vertical slots in the
middle plate A, and Figures 1 and 2 M and M show two angular slots in the
jaws B and C respectively.
Figure 1 E and E", and Figure 2 E and E, show locking bolts.
Figures 1 and 2 D, show the pivot running through the jaws, and also through
a hole in the middle plate A.
When the jaws B and C are closed, as shown in Figure 1, the locking bolt E is
held at the upper portion of the slot K in the middle plate A, and at the upper
portion of the slot R in the jaw or cheek B, and at the upper portion of the slot R¹
in the jaw or cheek C, as shown in Figure 1, and the locking bolts or pins E¹
and E remain in the positions shown in Figure 1, and also in the upper portions
of the slots marked N and N¹ in the middle plate.
"
The portion of the jaws or cheeks B and C marked F and F¹ in Figure 1, when
the hook is closed being of greater width from side to side than the diameter of
the circular hole in the ring or catchplate marked S in Figure 2, come in contact
with the plate S Figure 2 in the case of an overwind, and the jaws B and C are
caused to move on the pivot D, and the upper portions of the jaws or cheeks
then swing open and catch onto the plate or ring marked S₁ Figure 2, and the
cheeks B and C Figures 1 and 2 release the upper shackle pin.
The bolt E Figures 1 and 2 travels along the slots R and R' Figures 1 and 2,
and falls downwards in the slot K of the middle plate A, and assumes the position
as shown by E Figure 2, and as the bolt E will not of itself rise in the slot K of
the middle plate, it locks the jaws or cheeks B and C, Figures 1 and 2 in the
position shown in Figure 2, until this bolt E is taken out or moved upwards in
the slots.
Similarly, by the striking of the portions of the cheeks marked F and F in
Figure 1 against the under side of the catchplate (S Figure 2), the slots M and M¹
in Figure 1 travel along over the locking bolts E and E", until the lower portions
of the slots M and M come into line with the slots N and N¹ in the middle
plate A, when the bolts E¹ and E drop into the lower part of the slots M and N
and M and N respectively, and lock the cheeks B and C in the position shown in
Figure 2.
Figure 1 G and Figure 2 G are locking bolts working in slots in the middle
plate A as shown, which bolts G G when not held up by the lip or rim of the

page_text: jaws B and C, drop down in the upper slots, as shown by G G in Figure 2, and
will then prevent the jaws B and C closing together again into the position as
shown by B and C Figure 1, until these locking bolts G G are raised or taken out
of the slots.
The hook or link may if preferred be made with two or more plates correspond-
ing to A in Figures 1 and 2, placed outside of instead of between the jaws or
cheeks B and C Figures 1 and 2. There would then be two or more plates and
two cheeks or jaws, instead of two cheeks and a middle plate.
The catchplate as shown in Figure 2 may be either a single plate of suitable
thickness to present an upper and under side as shown, or there may be two or
more catchplates as shown by S and S¹ Figure 2, or two separate plates may be
built up or bolted together with an intervening space, which may be filled up if
found desirable, or the two catchplates may be placed one on top of the other.
The catchplate may be of any suitable size or width, and the catchplate or
catchplates may be bolted or otherwise fixed to, or laid upon girders or timbers
or other suitable support, as may be most convenient. We do not confine our-
selves to the material of which the hook is made, nor to the number of slots and
locking bolts, nor to their exact shape and position nor to the exact shape and
size of the hook or link, nor to the number nor thickness of the plates or portions
of which the hook or link is composed, nor to the material of which the hook or
catchplate is made, and the ring or catchplate may be of any thickness or height
from its bottom to its top surface, as required proportionate to the size, dimensions
and arrangement of the hook.
The middle plate A Figures 1 and 2 may be be composed of more than one
piece, or more than one plate may be placed side by side.
In Figures 3 and 4 an arrangement is shown by which the locking bolt E.
as shown in Figures 1 and 2, is dispensed with, and a slot or space of any
shape, W and W1 (Figures 3 and 4) in the cheeks B and C respectively admits of
the lower shackle pin being inserted through these slots or spaces, and through a
circular hole in the plate A, Figures 3 and 4, and this plate A, Figures 3 and 4,
may be either single or double, and the single or double plates may be placed
either between the cheeks B and C, or outside of the cheeks B and C, and may be
made of one or more pieces in each plate, but in no case does the spindle or
shackle nin which carries the load, (as shown by E in Figures 3 and 4) form a
locking bolt, the object being to avoid the concussion and shock which would be
caused by the load being attached to a locking bolt or spindle, and such bolt or
spindle suddenly being dropped into a locking slot, on the hook being opened by
the catchplate.
Figure shows a side view of Figure 1: A Figure 5 being the middle plate
corresponding to A Figure 1, and B and C Figure 5 are the jaws or cheeks marked
respectively B and C in Figures 1 and 2.
Figure 5 E and E¹ are locking bolts. Figure 5 G shows the upper locking bolts
corresponding to the same letters in Figure 1.
The locking bolts are shown as projecting beyond the plate, for convenience in
raising or taking out these bolts in the case of an overwind, but we do not confine
ourselves to these bolts projecting as shown.
Figure 6 shows the side view of the hook or link as shown in Figure 3; B and C
in Figure 6 being the cheeks or jaws, and A and A¹ being the outer plates; A in
Figure 6 corresponding to A in Figure 3, and A¹ being the corresponding outer
plate, (which for simplicity is not shown in Figures 3 and 4). E' Figure 6 shows
the locking bolt corresponding to E¹ in Figures 3 and 4.
The thickness of the catchplate in the case of a solid plate, or the distance of the
upper plate from the lower plate in the case of the catchplate being double, as
shown by S and S. Figures 2 and 4, is so proportioned to the shape, size, and
dimensions of the hook, that when the hook opened by the parts F and F¹
Figures 1 and 3, the upper portion of the jaws B and C prompty overlaps the
upper catchplate S¹ Figures 2 and 4, or the upper surface of a single plate, and

page_text: will quickly catch on to the upper plate or upper surface by means of the project-
ing portions C and B' as shown in Figures 2 and 4, and, taken together will be
of greater width than the circular hole in the catchplate.
The plates are usually flat, but we do not confine ourselves to their flatness
nor to their thickness.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. The use of a catchplate consisting of more than one plate, either connected
together or otherwise, suitably proportioned, and placed one above the other, to
achieve the object in view.
2. The use of slots with locking bolts which fall into position and lock open
the cheeks or jaws of the safety hook or link, the locking bolt or bolts being in
all cases separate from, and independent of, the bolt or pin which carries the
suspended load, and working free and falling into position as described.
3. The use of angular slots in conjunction with vertical or inclined slots or
grooves and locking bolts, for the purposes described.
4. The arrangement of safety hook or link substantially as shown and
described.
Dated this Eighteenth day of Annil 1800
ABBOTT GODFREY LAKER,
WALTER WILLIAM ABBOTT LAKER.