IMPROVEMENTS IN DRUMS AND APPA- RATUS CONNECTED THEREWITH FOR GIVING MOTION TO SHAFTS
Year: 1860

page_text: LETTERS PATENT to Henry Offergeld, of Eilendorf, near Aix-la-Chapelle,
Mechanician, for the Invention of "IMPROVEMENTS IN DRUMS AND APPA-
RATUS CONNECTED THEREWITH FOR GIVING MOTION TO SHAFTS."
Sealed the 19th March 1861, and dated the 29th September 1860.
PROVISIONAL SPECIFICATION left by the said Henry Offergeld at the
Office of the Commissioners of Patents, with his Petition, on the 29th
September 1860.
I, HENRY OFFERGELD, of Eilendorf, near Aix-la-Chapelle, Mechanician, do
hereby declare the nature of the Invention for "IMPROVEMENTS IN DRUMS
AND APPARATUS CONNECTED THEREWITH FOR GIVING MOTION TO SHAFTS," to be
as follows:-
This Invention has for its object improvements in drums and apparatus
connected therewith for giving motion to shafts. For these purposes a drum
is placed on a shaft in such manner as to admit of its turning freely thereon
except when it is locked or bolted to a disc fixed on the shaft. The disc has
a friction strap which passes nearly round it. One end of this strap is fixed to
any convenient position above the disc; the other end of the strap has an
enlargement thereon with a slotted opening through it. The disc can when
the drum is bolted thereto revolve free of the strap, but to prevent the rotation
of the disc and shaft when the drum is unlocked, a spring bolt is arranged to
move outwards so as to pass through the slotted opening in the strap; the
bolt which locks the drum to the disc is also a spring bolt which when
permitted will move outwards by the elasticity of its spring, but when the
drum is at work this bolt is retained by another bolt, which is locked by

page_text: another spring bolt, which is retained by a pin, which can be moved out
at any time by a workman pulling on a handle or pull which is connected
by a wire or cord and bell cranks to the pin. The handle or pull may be in
any convenient position.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Offergeld in the Great Seal Patent Office on the 26th
March 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
OFFERGELD, of Eilendorf, near Aix-la-Chapelle, Mechanician, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of September, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Henry Offergeld, Her special licence that I, the said Henry Offergeld,
my executors, administrators, and assigns, or such others as I, the said
Henry Offergeld, 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 Invention for "IMPROVEMENTS IN
DRUMS AND APPARATUS CONNECTED THEREWITH FOR GIVING MOTION TO SHAFTS," upon
the condition (amongst others) that I, the said Henry Offergeld, my executors
or administrators, 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 Henry Offergeld, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
This Invention has for its object improvements in drums and apparatus
connected therewith for giving motion to shafts.
The Drawings hereunto annexed shew views
connected therewith according to my Invention.
Figure 2 a side view, and Figure 3 a section of the drum and apparatus.
of a drum and apparatus
Figure 1 is an end view,

page_text: a is a shaft on which is keyed a disc or wheel 6, on the shaft a is also
a drum c, which is capable of turning freely around the shaft when it is
not locked or bolted to the disc b. The drum c is driven by a belt put in
motion by a steam or other engine, and when the drum c is connected with the
disc b by the bolt c', the motion of the drum is transmitted to the shaft a; but
when it is desired to stop the rotation of the shaft a pin d, which before was
pressed by a spring d¹ into a groove in the bolt e, and thus held the bolt back,
is withdrawn from the groove by means of the handle k, and the bolt is then
shot forward by the spiral spring & around it into the position shewn by red
lines in Figure 3; when the bolt e is shot forward into this position, the button
f which retained the bolt c¹ in its forward position comes against the bolt e,
and the button is by it moved into the position shewn at Figure 4; the bolt c¹
being now no longer held by the button is pushed back by the spiral spring around
it so that the drum c is disconnected from the disc or wheel b, and the drum c
is thus free to revolve around the shaft, when the drum c is driven by a steam
engine, the handle k is by preference connected with the throttle valve of the
engine, so as to stop the engine when the drum is disconnected from the disc
or wheel b.
In order to stop the rotation of the shaft a and disc b, when the
disc is released from the drum c, the disc 6 has nearly all around it a friction
strap g; one end of this strap is fixed to a beam above the shaft a, and on the
other end of the strap is an enlargement having through it a slot, when the
drum c is disconnected from the disc b, a bolt 61, which before was retained
within the disc by a pin projecting from the bolt 6' entering a hole in the end
of the bolt c is released by the withdrawal of the bolt c¹, and is allowed to
be shot forward by a spiral spring around it, and its end thus caused to
project through the slot in the strap, the disc will consequently be imme-
diately stopped. When it is desired that the drum c shall again drive the
shaft a, the bolts c¹ and 6', are brought back to their original position by
the apparatus shewn at Figures 7 and 8, and the drum c is then again put
in motion.
In witness whereof, I, the said Henry Offergeld, have hereunto set my
hand and seal, this Ninth day of March, in the year of our Lord,