AN IMPROVEMENT IN THE CONSTRUC- TION OF CRANKS, SUCH AS ARE USED FOR BELLS AND OTHER PURPOSES
Year: 1824

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
POTTER BURT, of the Borough of Devizes, in the County of Wilts, Iron-.
monger, send greeting.
WHEREAS His present most Excellent Majesty King George the Fourth,
did, by His Letters Patent under the Great Seal of that part of Great Britain.
and Ireland called England, bearing date at Westminster, the Fourteenth
day of April, in the fifth year of His reign, for Himself, His heirs and
successors, give and grant unto me, the said Henry Potter Burt, His especial
licence that I, the said Henry Potter Burt, my exors, admors, and assigns, or,
such others as I, the said Henry Potter Burt, my exors, admors, and assigns,
should at any time agree with, and no others, from time to time and at all;
times during the term of years therein expressed, should and lawfully might
make, use, exercise, and vend, within England, Wales, and the Town of
Berwick-upon-Tweed, my Invention of "AN IMPROVEMENT IN THE CONSTRUC-
TION OF CRANKS, SUCH AS ARE USED FOR BELLS AND OTHER PURPOSES;" in which
said Letters Patent there is contained a proviso obliging me, the said Henry.
Potter Burt, by an instrument in writing under my hand and seal, particularly
to describe and ascertain the nature of my said Invention, and in what
manner the same is to be performed, and to cause the same to be inrolled.
in His Majesty's High Court of Chancery within six calendar months next,
and immediately after the date of the said in part recited Letters Patent, as,
in and by the same, reference being thereunto had, will more fully and at
large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Henry Potter Burt, do hereby declare that the nature of my said Invention,
and the manner in which the same is to be performed, are particularly
described and ascertained in and by the Drawing hereunto annexed, and the
following description thereof, that is to say :-
In the cranks for bells and other purposes as at present constructed the
staples and studs which support the moving parts are either firmly united to or
form a part of the plates, by means of which the cranks are affixed in their
places to the walls, cornices, &c. of the houses or other buildings, &c. where they
are to be used, and in case of repairing, cleaning, or putting new wires to the
cranks, &c., tliose plates must be entirely removed from their places in the
walls, &c., and thereby the paper, cornices, mouldings, &c. be much injured.
The moving parts are also liable to injury from external accidents when they
are openly exposed, or to be impeded in their movements and the wires broken
when inserted into walls, cornices, &c., from the falling of mortar, brick,
plaster, &c., upon them, and thereby rendering it necessary frequently to take
down the whole range of bells, &c. .Now, in my said improved cranks I have
contrived that the staples or studs to which the moving parts are hung can at
any time be removed or taken away from their fixed plates, whilst those plates
themselves remain affixed in their places; and I have likewise secured the
moving parts from injury by enclosing them in metal casings affixed to the
plates; and I hereby claim as my Invention any and all of the various
methods in which my said improved cranks for bells and other purposes can
be constructed. As, however, it is desirable that I should give some examples
of methods of carrying my said Invention into effect, I shall proceed to do so
by a reference to and a description of the Drawings, which as aforesaid are
affixed to this specification.
Fig. 1 represents a single mortise crank. A, the fixed frame plate, shown
separately in Fig. 2. B, the crank. C, C, &c., the moveable staple shewn in
section in Fig. 3, with the crank B in its place within it. In Fig. 2, D, D, are
the cavities or recesses which are sunk into the plate A to receive the moveable
staple C, and which is secured therein by screws. In Fig. 1, E is the
protecting box (shewn by dotted lines). In Fig. 4, A is the frame plate of a
quintuple or five-part crank. .D, D, &c., the cavities to receive the moveable
staples C, C, C, of Fig. 8, and the cranks within them. Fig. 5, F, a single
erank turning upon a stud. at G, affixed to a moveable plate H, sunk into a
cavity in the fixed plate A, and secured by screws. Fig. 6, A, the fixed plate
and the cavity D within it to receive the moveable plate H of Fig. 5. Fig. 7
an area crank turning upon the screw I affixed to a knuckle upon the iron

page_text: rails, and having another screw and knuckle J to which the rod K is hinged,
and to which rod the bell-wires are affixed. L, a tube or metal casing (shewn
by dotted lines) to protect the rod K from injury. Fig. 8, a bell-pull crank.
A, the fixed plate and the hemispherical cavity in it. C, the moveable plate
and socket, secured in other cavities made in the plate A to receive it by
screws.
In witness whereof, I, the said Henry Potter Burt, have hereunto set
my hand and seal, this Sixth day of October, in the year of our Lord
One thousand eight hundred and twenty-four.