Year: 1898

page_text: I, EMILE HERVAIS, of 9, Rue Saint Sébastien, Paris, in the Republic of France,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to drawing-pens and the object is to simplify and
cheapen their construction.
Instead of forming the blade of drawing-pens in the ordinary manner which
requires much material and considerable labour, I manufacture such blades
from pieces of ordinary round steel wire, one end of which is inserted into the
socket fixed to the handle, and which only requires to be brought to the required
shape at and near the point.
Each of the blades of the instrument is thus formed from a piece of round
steel rod which retains its original section in the part fixed in the socket and
which is cut away at the portion toward the point of the pen in such a manner
as to present in section the form of a segment of a circle, with the flat side placed
innermost. This reduced portion is slightly curved so as to bring the points
together. The two blades thus formed are mounted in the socket which is
preferably made of German silver or other convenient material and provided
with two holes for the reception of the ends of the blades.
The blades are held in position by a screw passing crosswise through the
socket. To retain the blades firmly the screw engages with corresponding notches
provided in both blades, while moreover the screw head presses against the
same.
My improved blades of round steel are of too small a diameter to conveniently
allow of drilling a hole through them for receiving an ordinary adjusting screw.
For this reason instead of a screw I employ a strap-bolt formed of a cylindrical
portion having a longitudinal slot through which the two blades are passed.
The portion outside the slot is screw-threaded and fitted with an adjusting nut.
Between this nut and the blade nearest to it a washer is interposed in which
two semi-circular recesses are formed which by partly embracing the blade pre-
vent the said washer from revolving with the nut. Thus by turning the nut
towards the right or towards the left the washer is caused to advance in the
one or other direction along the screwed portion and thereby effect the closing
up or the separating of the points of the blades.
Blades so constructed require very little material and labour for their manu-
facture and so enable a cheap instrument to be provided without sacrifice of
quality; or an instrument may be sold at the same price as ordinary instru-
ments but having blades of a superior quality of steel.
Obviously these improvements are equally applicable to pens for drawing
compasses as well as to ordinary drawing-pens.
Dated this Twenty-third day of December 1898.

page_text: I, EMILE HERVAIS, of 9, Rue Saint Sebastien, Paris, in the Republic of France,
Engineer, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
This invention relates to drawing-pens and the object is to simplify and
cheapen their construction.
Instead of forming the blade of drawing-pens in the ordinary manner which
requires much material and considerable labour, I manufacture such blades
from pieces of ordinary round steel wire or rod one end of which is inserted
into the socket fixed to the handle, and which only requires to be brought to
the required shape at and near the point.
I have illustrated in the accompanying drawings by way of example, a
drawing-pen having my improvements applied thereto.
Fig. 1 is a longitudinal section of the instrument drawn to an enlarged scale.
Fig. 2 is a side view of Fig. 1 partly in elevation and partly in section and look-
ing in the direction of the arrows 2 2. Fig. 3 is a cross-section on line 3-3
of Fig. 2. Fig. 4 is a cross section on line 4-4 of Fig. 2 drawn to a much
enlarged scale.
As will be seen from these figures cach of the blades A of the instrument
is formed from a piece of round steel rod which retains its original section in
the part a fixed in the socket B and which is cut away at the portion toward
the point G of the pen in such a manner as to present in section the form of a
segment of a circle, with the flat side placed innermost. This reduced portion
is slightly curved (see Fig. 1) so as to bring the points of the two blades together.
The two blades A A thus formed are mounted in the socket B which is pre-
ferably made of German silver or other convenient material and provided with
two holes for the reception of the ends of the blades.
The blades are held in position by a screw C passing crosswise through the
socket. To retain the blades firmly the screw engages with corresponding
notches a provided in both blades, while moreover the screw head presses against
the same.
My improved blades of round steel are of too small a diameter to conveniently
allow of drilling a hole through them for receiving an ordinary adjusting screw.
For this reason instead of a screw I employ a strap-bolt consisting of a cylin-
drical portion D having a longitudinal slot through which the two blades are
passed. The portion outside the slot is screw-threaded and fitted with an adjust-
ing nut E. Between this nut and the blade A nearest to it a washer F is inter-
posed in which the semicircular recesses f are formed which by partly embrac-
ing the blade prevent the said washer from revolving with the nut. Thus by
turning the nut towards the right or towards the left the washer is caused to
move in the one or other direction along the screwed portion D and thereby
effect the closing up or the separating of the points G of the blades.
Blades so constructed require very little material and labour for their manu-
facture and so enable a cheap instrument to be provided without sacrifice of
quality; or an instrument may be sold at the same price as ordinary instru-
ments but having blades of a superior quality of steel.
Obviously these improvements are equally applicable to pens for drawing
compasses as well as to ordinary drawing-pens.

page_text: Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. The improvement consisting in forming or constructing the blades or arms
of drawing-pens from round steel wire or rod, substantially as herein described.
2. In drawing pens, the blades or arms of which are made from round steel
wire the use for adjusting the blades, of a strap bolt and adjusting nut, substan-
tially as herein described.
3. The special construction combination and arrangement of parts forming
the improved drawing pen, substantially as herein described in reference to the
accompanying drawings.
Dated this 21st day of September 1899.
For the Applicant,
J. C. CHAPMAN,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.