IMPROVEMENTS IN PENCIL OR LEAD-HOLDERS FOR COMPASSES, ALSO APPLICABLE TO OTHER LEAD OR PENCIL HOLDERS
Year: 1882

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex for an
Invention of IMPROVEMENTS IN PENCIL OR LEAD-HOLDERS FOR COMPASSES,
ALSO APPLICABLE TO OTHER LEAD OR PENCIL HOLDERS a communication
to him from abroad by Georg Schönner, of Nürnberg, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 21st December 1882.
HERBERT JOHN HADDAN of Kensington Middlesex "IMPROVEMENTS IN PENCIL
OR LEAD-HOLDERS FOR COMPASSES, ALSO APPLICABLE TO OTHER LEAD OR PENCIL-
HOLDERS" a communication to me from abroad by Georg Schönner, of Nürnberg,
in the German Empire,
This invention has for its object to provide a more convenient way of attaching
leads or pencils to compasses.
For this purpose I attach to the base of the movable holder or leg of the
compasses a tube, preferably of metal, in the centre of which there is another tube
enclosing the movable lead or pencil. Between the inner and outer tube is placed
a spring provided with a strap which surrounds the inner tube and is provided
with a button projecting through a suitable aperture of the outer tube, while the
free end of the spring, which may be widened and serrated projects through a
suitable opening of the inner tube and presses upon the movable lead or pencil, so
as to retain the latter in position
The movable lead or pencil projects through the lower (or outer) ends of the two
tubes and can be shifted after depressing the button, so as to remove the spring
from the lead or pencil.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddau in the Great Seal Patent Office on the
20th June 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex "IMPROVEMENTS IN
PENCIL OR LEAD-HOLDERS FOR COMPASSES ALSO APPLICABLE TO OTHER LEAD
OR PENCIL-HOLDERS," a communication to me from abroad by Georg Schönner, of
Nürnberg, in the German Empire,
•
Hitherto lead-holders for compasses have been generally composed of two cheeks
made contractible by a screw, or they consist of a conical sleeve made adjustable
on a hollow screw-spindle provided with tongues which enclose the lead and are
pressed against the same by the said sleeve.
The improved lead-holder, illustrated by the accompanying drawing, Figs. 1 to 4,
has the object to avoid the defects. adhering to the lead-holders commonly used.
This lead holder carries a sleeve D which encloses the sleeve C adapted to receive
the lead.
On the outer surface of the sleeve C a spring B is fastened; this spring is
provided with a fork-shaped strap A and protrudes with its free end b through
the aperture F of the sleeve C, thereby pressing against the round lead pencil.
The end b which may be flattened and toothed or riffled (Fig. 4) retains the lead,
which can only be loosened, by pushing the knob of the strap A inward, so as to
break the contact of the spring with the lead.
This construction may be applied to all kinds of pencil holders with removable
lead.
What I claim is:
An appliance for holding the leads for compasses or pencils, which is composed 2
of a sleeve D and a sleeve C enclosed by the same, the sleeve C being provided
with a spring connected with a strap A and adapted to hold the lead by pressure,
until released by pushing down a button c; substantially as described.
In Witness whereof I the said Herbert John Haddan have hereunto set my
hand and seal this twentieth day of June A.D. one thousand eight hundred 3
and eighty three.