Improvements in and connected with Lead Pencils.
Year: 1899

page_text: Date of Application, 12th June, 1899
Complete Specification Left. 8th Mar., 1900-Accepted. 14th Apr. 1900
privation,
2001 'QU
Complete Specification Left. 8th Mar., 1900-Accepted. 14th Apr. 1900
PROVISIONAL SPECIFICATION.
Improvements in and connected with Lead Pencils.
We, IMANUEL SCHMIDLAPP and KARL WEYMAR, both of Pforzheim, in the
Grand Duchy of Baden, German Empire, Manufacturers, do hereby declare the
nature of this invention to be as follows;
The present invention relates to a lead pencil, into the outer sleeve of which
are pressed helical grooves for the purpose of actuating the lead carrier so as to
extend or withdraw the lead. Hitherto the lead carrying mechanism has been
actuated by a sleeve having on its inner surface a helical wire.
Our invention is clearly represented in the accompanying drawing in which
Fig. 1 is an elevation of the outer sleeve,
Fig. 2 a section through the outer sleeve, the grooves being pressed inwards,
Fig. 3 a section through a modified form of sleeve, the grooves being pressed
outwards;
Figs. 4 & 5 represent an elevation and section respectively of a lead carrier
to which the sleeve as represented in Fig. 1 can be fitted.
The propeller screw a (Fig. 4) is provided with four helical grooves. As in
the constructions usually employed, the lead is extended or withdrawn by rotation
of the propeller screw.
This rotation is easily effected by means of an outer sleeve b into which grooves
are pressed either to the inside or to the outside, according to the grooves of the
propeller screw.
In order to prepare the pencil for use, the outer sleeve is fitted over the
lead carrier.
Ti 11
1011
. T
1000
Improvements in and connected with Lead Pencils.
We, IMANUEL SCHMIDLAPP and KARL WEYMAR, both of Pforzheim, in the
O Grand Duchy of Baden, German Empire, Manufacturers, 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:-
The present invention relates to a lead pencil, into the outer sleeve of which
are pressed helical grooves for the purpose of actuating the lead carrier so as to
Pic 871

page_text: extend or withdraw the lead. Hitherto the lead carrying mechanism has been
actuated by a sleeve having on its inner surface a helical wire.
Our invention is clearly represented in the drawing filed with the Provisional
application, in which:
Figure 1 is an elevation of the outer sleeve,
Figure 2 a section through the outer sleeve, the grooves being pressed inwards,
Figure 3 a section through a modified form of sleeve, the grooves being pressed
outwards;
Figures 4 & 5 represent an elevation and section respectively of a lead carrier
to which the sleeve as represented in Figure 1 can be fitted.
The propeller screw a (Figure 4) is provided with four helical grooves. As in
the constructions usually employed, the lead is extended or withdrawn by rotation
of the propeller screw.
This rotation is easily effected by means of an outer sleeve b into which grooves
are pressed either to the inside or to the outside, according to the grooves of the
propeller screw.
In order to prepare the pencil for use, the outer sleeve is fitted over the
lead carrier.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
In a lead-pencil, the combination of a propeller-screw which is the lead-carrying
mechanism, provided with 4 helical grooves on its outer side, and a sleeve having
helical grooves corresponding with those of the propeller-screw, substantially as
and for the purpose described.