Improvements in Lead Pencils.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Lead Pencils.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of London
Gentleman do hereby declare the nature of this invention (which has been
communicated to me from abroad by the Eagle Pencil Company of the City of
New York and State of New York, United States of America) 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 what are known as "propeller" pencils and consists of
a new propelling movement which can best be explained and understood by
reference to the accompanying drawings in which
Figure 1 is a longitudinal central section of a pencil embodying this invention
and Figures 2. 3 and 4 are perspective views of the three essential parts of the
propeller movement viz. :-the lead tube (Figure 2); the propelling screw
(Figure 3); and the follower (Figure 4).
The lead tube A has a front cylindrical portion a of the size of the lead to be
contained therein, the lead fitting snugly in this part of the tube. To the rear of
the front portion a the tube becomes approximately elliptical in shape-having on
one side an enlargement & extending lengthwise of the tube for the remainder of its
length. This enlargement is a channel for the reception of the propelling screw B
the said screw being supported therein in suitable bearings which permit it to rotate
but restrain it from longitudinal movement. These bearings are furnished in this
instance by forming at the front end of the enlargement an opening through which
the front end of the screw passes; and by providing the screw at its rear with
an annular collar d which enters and engages a slot e in the enlargement b. The
follower C is provided with a tubular screw threaded portion b laterally projecting
from the body of the follower and encircling and engaging the screw B. Rotation
of the screw will advance or retract the follower according to the direction of
rotation.
Movement may be imparted to the screw in any convenient and suitable way.
In the pencil shewn in the drawing the case or sheath is in two parts consisting of
front and rear sections D D' so united that the one may be rotated independently
of the other; and the screw is connected to the rear section D', having for this
purpose a flat stem g at its rear which enters a slot h in a thimble h¹ fixed to the
interior of the said rear section D'. The lead tube A is attached to the front
section D, being for this purpose secured in a sleeve or tubular socket i on which
the front section is mounted and made fast. Within this sleeve fits another sleevej
which has in it an annular groove. entered by an annular internally projecting
rib on the outer sleeve-the two in this way being held together while at the
same time the one can rotate independently of the other. The sleeve projects to
the rear of sleeve i and forms a bearing upon which the rear section D' is fitted
and secured.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
1. The lead tube formed rearward of its front cylindrical portion with a lateral
enlargement b in combination with the rotatable propelling screw extending in and
lengthwise of the said enlargement and restrained from longitudinal movement
therein, and the follower provided with a lateral extension engaging with the
propelling screw substantially as and for the purposes hereinbefore set forth..

page_text: 2. The lead tube formed with a lateral enlargement b as described, the rotatable
propelling screw in the said enlargement and the follower engaging with the said
screw, in combination with the two part handle composed of independently
rotatable sections the lead tube and its contained parts being carried by one section
and the screw being connected to, and rotated by, the other section substantially as
herein before set forth.
3. The arrangement and combination of parts constituting the lead pencil as
herein before described and illustrated in the accompanying drawings.
D
1 of Anul 1901
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.