A COMPOUND SAFETY DISENGAGING HOOK
Year: 1867

page_text: LETTERS PATENT to Jubal Charlton Broadbent, of Rochdale, in the County
of Lancaster, Engineer, for the Invention of "A COMPOUND SAFETY
DISENGAGING HOOK."
Sealed the 27th August 1867, and dated the 1st March 1867.
PROVISIONAL SPECIFICATION left by the said Jubal Charlton Broadbent
at the Office of the Commissioners of Patents, with his Petition, on the
1st March 1867.
I, JUBAL CHARLTON BROADBENT, of Rochdale, in the County of Lancaster,
Engineer, do hereby declare the nature of the said Invention for "A COM-
POUND SAFETY DISENGAGING HOOK," to be as follows:
The principal object of my Invention is to prevent accidents from over-
winding in coal mines, that is to say, to prevent the cage in which the miners
and coals are raised' out of the pit from being drawn over the head gear
pulley; but my Invention may be adapted for liberating the weight or block
in pile driving machines, and for other purposes.
My improved safety hook consists of two complete hooks, the open parts
whereof face each other; these two hooks are jointed to a fulcrum stud, which
is connected by a bridle to the lifting chain or rope, and each hook is provided
with a horn projecting above the fulcrum stud. The cage is held by means

page_text: of the ring at the top of the chain, passing between both parts of the com-
pound hook, and if by the falling of a lump of coal or other accident one of
the hooks should be disengaged from the ring the cage would be held up by
the other, but if the cage should be wound up too high the horns of the hooks
are brought against suitable stop bars, or a ring placed a little below the level
of the axle of the head gear pulley, and are thus simultaneously opened,
thereby disengaging the ring from the hooks, and allowing the liberated cage
to be supported by the usual stop catches, or by the apparatus for which
former Letters Patent were granted to me on the 19th day of September
1865, No. 2883.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Jubal Charlton Broadbent in the Great Seal Patent Office
on the 30th August 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JUBAL
CHARLTON BROADBENT, of Rochdale, in the County of Lancaster, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of March, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Jubal Charlton Broadbent, Her special license that I, the said Jubal
Charlton Broadbent, my executors, administrators, and assigns, or such others
as I, the said Jubal Charlton Broadbent, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an Inven-
tion for "A COMPOUND SAFETY DISENGAGING HOOK," upon the condition (amongst
others) that I, the said Jubal Charlton Broadbent, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Jubal Charlton Broadbent, do hereby
declare the nature of my said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement (that is to say) :-
The principal object of my Invention is to prevent accidents from over-
winding in coal mines, that is to say, to prevent the cage in which the miners'
and coals are raised out of the pit from being drawn over the bead gear
pulley; but my Invention may be adapted for liberating the weight or block
in pile driving machines, and for other purposes.
My improved safety hook consists of two complete hooks, the open parts
whereof face each other; these two hooks are jointed to a fulcrum stud, which
is connected by a bridle to the lifting chain or rope, and each hook is provided
with a horn projecting above the fulcrum stud. The cage is held by means
of the ring at the top of the chain passing between both parts of the com-
pound hook, and if by the falling of a lump of coal or other accident one of
the hooks should be disengaged. from the ring the cage would be held up by
the other, but if the cage should be wound up too high the horns of the hooks
are brought against suitable stop bars or a ring placed a little below the level
of the axle of the head gear pulley, and are thus simultaneously opened,
thereby disengaging the ring from the hooks, and allowing the liberated cage
to be supported by the usual stop catches, or by the apparatus for which
former Letters Patent were granted to me on the Nineteenth day of September,
One thousand eight hundred and sixty-five, Number 2383.
And in order that my Invention may be fully understood and readily carried
into operation I will proceed to describe the accompanying Sheet of Drawings,
reference being had to the figures and letters marked thereon.
Figure 1 is an elevation of the compound safety disengaging hook in proper
position when supporting the cage or other article; Figure 2 is a side view of
the same; and Figure 3 represents the safety hook when open to liberate the
cage or other article.
a and b are two complete hooks, the open parts of which face each other;
these hooks are jointed to a fulcrum stud, which is connected by a bridle link c
to the lifting chain or rope. In order to reduce the weight of these horns
they are made with perforations; by this means the preponderating weight of
the hooks causes them to close together. The cage, driving block, tup, or
other article to be suspended being held in the opening d formed by the
said hooks closing towards each other. In case of overwinding in mines the
projecting horns of the hooks are brought against suitable stop bars, or against
a ring e placed a little below the level of the axle of the winding or head gear
pulley, and as the hooks continue to ascend the horns acting on the ring cause
the hooks to be simultaneously opened, as shewn in Figure 3; in this case the

page_text: liberated cage would fall upon ordinary stop catches fixed in the conductors,
or its descent might be prevented by the "safety apparatus" for which
former Letters Patent were granted to me on the Nineteenth day of Sep-
tember, One thousand eight hundred and sixty-five, Number 2383. It will
be seen that in case a piece of coal or other object falling down a shaft should
strike one of the hooks and throw it off the other hook would remain to sup-
port the cage, thus affording the ordinary conditions of security.
: It is evident that when my improved safety hooks are employed to raise
the tup or driver of a pile-driving machine the stop bars or ring e would be
placed in in the desired position to liberate the tup at the proper height for giving
the requisite blow to the pile; these hooks may also be used to liberate the
weight or block for breaking heavy castings, or for various other purposes.
I prefer to make these safety hooks of malleable or carburretted cast iron,
but they may be made of wrought iron or steel.
Having thus stated the nature of my Invention, and described the manner
of performing the same, I declare that I claim the compound safety disen-
gaging hooks and the horns by which they are opened, as shewn and
described.
In witness whereof, I, the said Jubal Charlton Broadbent, have hereto
set my hand and seal, this Twenty-ninth day of August, One thousand
eight hundred and sixty-seven.
JUBAL C. BROADBENT. (L.S.)
JUBAL C. BROADBENT. (L.S.)