US1593119A

US1593119A - Mechanical pencil

Info

Publication number: US1593119A
Application number: US488771A
Authority: US
Inventors: Byron B Goldsmith
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-08-01
Filing date: 1921-08-01
Publication date: 1926-07-20
Anticipated expiration: 1943-07-20

Description

July 20,1926. 1,593,119

\ B. B. GOLDSMITH MECHANICAL PENCIL led August 1. .1921 N A TTORNE Y Patented July 20, 1926.

UNITED STATES BYRON B. eornsivrrrn, or new YORK,1\T. Y.

MECHANICAL, PENCIL.

Application filed August -1, 1921. Serial No. 488,771.

The present invention relates to certain novel details of improvement in that class of pencils in which removable sections of lead are carried within a convenient casing from which they are protruded more or less at will by mechanical means.

It, The invention is illustrated inthe accompanying drawings wherein Figu'es 1 1307 are plan views of the various eleme ts orwhich the pencil are composed, herelrafter ldentified, and Figure 8 is a longitudna sec lO al view o e completely assembled pencll. b .L.\ t' 10 is shcwv thn u slliil eld tube into N the forward end of which the section of lead (not shown) is fitted in such a manner as to be held by the friction caused by resilient pressure at the split tip 11. The end of this lead tube is flush with the end of the outer casing 15, and the opening in the latter is made large enough to permit the resilient jaws at the tip of the lead tube to open when a lead is inserted.

Within the lead tube 10, behind the inner end of the lead, a pusher rod 12 is fitted which is bent at right angles at its inner or rear end, so as to project through a longi' tudinal slot 13 in the tube. 1 rod has been placed as shown, I prefer to bend inward a short section of each side of the slot 13, as shown at 14, thus forming a stop which limits the extent of inward movement of the rod. The lead tube is centered within an outer tapered casing 15 of usual form by a for-- ward shell 16 with a tapered neck 17. This shell is preferably soldered to the lead tube at the front edge of the neclrlt. The body of the shell is preferably fluted as shown and fits so tightly within the outer casing as to cause the outer casing and lead tube to turn together, or, in other words, when the casing is held in a fixed position, by the fingers of the user the lead tube will also remain fixed. The ejector tube 18 is provided with an internal helix-19, which may be coiled wire soldered or otherwise fastened in place, I which helix fits over the lead tube in such a manner as to engage with the projecting tip of the pusher rod 12.

A long rear shell -20 fits tightly over the tube 18, and is preferably made fast thereto by solder dropped into-a slot 21. The rear end of this tube is expanded, as shown at 22, and fits loosely within the casing 15 from which it projects into the cap.

The cap 23 is-provided with an interior After this bent I sleeve 24, soldered centrally in place against the bottom of the cap. This sleeve is preferably slitted, as at 25, and slightly expanded in the middle, as shown to an exaggerated degree in the drawings. The object of this is to cause the cap to exert a resilient pressure upon the interior of the shell at 22, within which it fits tightly when the cap 23 is fitted over said shell, so as to abut against the end of the casing 15.

The container 26 is provided to afford a convenient receptacle for additional pencil leads. It fits within the sleeve 24 tightly enough to be held safely in place, although permitting easy withdrawal to permit access to the leads when desired. At 27 is shown the usual spring clip, made fast by cars 28 passed through slits in the casing and bent over. In order to'permit of the interior mechanism being slipped in as a whole after assembling, the forward shell 16 is preferably fluted, as shown, to permit it to move past the bent over ears 28.

It is clear from the above description that, when a lead is in place with its inner end against the outer tip of the pusher rod 12, the lead may be projected forward by merely holding the casing 15 fixed while revolving the cap 23 in the proper direction, or vice versa. The cap 23 and sleeve 24 will revolve .the rearward shell 20 andwith it the tube 18, whose internal helix willforce the rod 12 forward, pushing out the lead; Upon opposite rotation of the cap, the rod 12 will be drawn inward, permitting the lead to be pushed back.

lVhat I claim is 1. In a mechanical pencil, an outercasing,

' means within the same for projecting a lead,

a shell projecting from said casing adapted to operate said means, a cap fitting over the exterior of said shell, and a sleeve fixed within said cap, said sleeve having slots and expanded portions between the slots adapted to fit tightly with resilient pressure within the shell for revolving the same.

2. In a mechanical pencil, an outer casing, a lead pusher, a lead tube fastened to the casing and made of one piece long enough to house both the pusher and the lead and having a bore making a sliding fit with the whole length of the pusher and shaped in front into a split resilient tip for grasping the lead, said lead tube being flush with the casing tip or extending beyond it and the hole in said casing tip being large enough to lead tube being forced into the slot to 0bstruct the passage 01": the pusher in its rearward movement.

In testimony whereof I have hereto set my hand on this 28th day of July, 1921.

BYRON B. GOLDSMITH.