IMPROVEMENTS IN MACHINERY AND APPARATUS TO PREVENT OVERWINDING AT COLLIERIES
Year: 1879

page_text: LETTERS PATENT to John King, of Pinxton, in the County of Derby, for
the Invention of "IMPROVEMENTS IN MACHINERY AND APPARATUS TO PREVENT
OVERWINDING AT COLLIERIES."
Sealed the 23rd May 1879, and dated the 20th March 1879.
PROVISIONAL SPECIFICATION left by the said John King at the Office of
the Commissioners of Patents on the 20th March 1879.
"IMPROVEMENTS IN
JOHN KING, of Pinxton, in the County of Derby.
MACHINERY AND APPARATUS TO PREVENT OVERWINDING AT COLLIERIES."
To prevent overwinding of a cage or hoist I employ a slip hook which consists of
two plates having their sides parallel to each other, or nearly so; the lower ends of
these plates have a thicker plate between them, and through the three plates the
horizontal pin or axle of a shackle is passed, the link or loop of which is secured to
the cage or hoist; the upper ends of the two plates are slotted vertically the receive
the pin or axle of a shackle, the link of which is secured to the end of the winding
rope or chain. Between the two plates are two other plates which rock upon an
axle placed about intermediately of their length; this axle is secured in and carried
by the two plates first mentioned; the inner plates are hooked at their upper ends,
and when at work overlap the pin or axle of the upper shackle in the vertical slot
of the parallel plates. The inner plates are kept in the overlapping position by a
copper or other metal pin which is which is passed through a hole in each plate,
and also through two short plates, one on each side of the slotted plates first named,
the pin firmly rivetting the six plates together. The short plates project at their
lower ends and clip the parallel plates first named, and also carry a pin near their
upper ends which passes through a vertical slot in the two parallel plates and through
angular slots in the inner plates. The apparatus acts as follows:-The shackle end

page_text: of the winding rope is passed through a ring or rings, or plate or plates (under the
groove of the hoisting rope or chain pulley) the orifice of which just allows of the
passage of the upper part of the plates, but upon the projecting lower ends of the
short plates striking the lower edge of a ring or plate the pin they carry is driven
down the vertical slots in the two plates first named, and the angular slots in the
inner plates which close in at their lower ends on one side and project at the
opposite side, the one side forming the hook passing clear of the upper shackle pin,
releasing the same, and at the same time the projecting lower ends of the hooked
plates pass over and rest upon the upper edge of the ring or plate and thus securely
suspending the cage or hoist when the rope or chain is overwound.

page_text: through the parallel plates, being secured in and carried by the upper end of the
shackle C, between the two holes for the shackle pins in each of the plates A is a
vertical slot in which a locking pin G, hereafter mentioned, slides.
The inner plates E at their lower end have each a shoulder projecting at one side
and are hooked at their upper ends, and when at work overlap the pin or axle of
the shackle D. When in the vertical slots of the parallel plates the inner plates are
kept in the overlapping position by a steel or iron pin G, shewn by dotted lines
at Figures 1 and 2, which is passed through angular or curved slots in the plates
and through the lower slots in the parallel plates, and also through a hole in each
of two short plates F, one of which is shown at Figure 7. There is one of these
plates on each side of the parallel plates; each short plate projects at the sides and
clips the parallel plates and slides between them and the inside of the lower shackle C.
The angular or curved slots in the plates E at their upper ends are formed straight,
parallel to the sides, such straight portions when the locking pin is in them prevent
the plates E from opening out until the short plates carrying the locking pin are
forced downwards by striking against the underside of a ring or plate I secured to
the cross bar or bars of the overhead framing under the groove of the pulley of the.
hoisting rope or chain.
To keep the short plates in the locked position, shewn at Figure 1, I employ two
copper or other metal pins H driven tight into holes near the edges of the parallel
plates; these pins project outside each of the plates the thickness or nearly so of
the short plates F. By means of a slip hook constructed as above described the
whole of the weight when at work is carried by the two strong plates E and the
axle pins of the shackles C and D.
The apparatus acts as follows:-The shackle end of the winding rope or chain is
passed through the ring or plate I, the orifice of which just allows of the passage of
the upper part of the slip hook, but upon the projecting sides of the plates F
striking the lower edge of the ring or plate I the copper or other metal pins H are
shorn off, the locking pin G which the plates F carry is driven down the vertical
slots in the plates A, and the angular or curved slots in the plates E which close in
at their lower ends on one side and project at the opposite side, the hooked ends
passing clear of the upper shackle release the same, and at the same time the pro-
jecting lower ends of the plates E pass over and rest upon the upper edge of the
ring or plate I and thus securely suspend the cage or hoist when the hauling rope or
chain is overwound.
Having now described the nature of my said Invention, and in what manner the
same may be performed, I declare that I claim,―
The construction and employment of a double shackle and a slip hook having
internal plates with angular or curved slots terminating at their upper ends in
straight slots to receive a locking pin carried by sliding shearing plates held up by
metal pins in the outer plates, substantially as hereinbefore described and illus-
trated in the Drawings annexed.
In witness whereof, I, the said John King, have hereunto set my hand
and seal, this Ninth day of September, in the year of our Lord One
thousand eight hundred and seventy-nine.
Witness,
H. W. GOUGH, C.E.,
Nottingham.
JOHN KING. (L.S.)