US2493892A

US2493892A - Sectional pencil

Info

Publication number: US2493892A
Application number: US27120A
Authority: US
Inventors: James W Mcphee
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-05-14
Filing date: 1948-05-14
Publication date: 1950-01-10
Anticipated expiration: 1967-01-10

Description

Jan. l0, 1950 J. W. MGPHEE 2,493,892

SECTIONAL PENCIL Filed May 14, 194s y IN VEN TOR'.

BY.' n

Patented Jan. 10..` 1950 UNITED STATES PATENT OFFICE l ]-'2,493,s92 l Y n sEorrioNAL 'PENCIL` James. W..McPhee, Los Angeles, Calif. f Application May '14, 194s, serial No.`27,120. v

taining a suitable marking point, and the mark-"l ing points being normally contained in the barrel of the pencil' when the sections areA joined together, except at one end of the barrel at which the Vmarking point is .exposedlongitudinally for use. The primary object of the invention is to provide sections which are normally joined and combined in such manner that they produce a iirm and rigid barrel but at the same time the sections can be disconnected successively and removed as each marking point is worn away by use. Another object is the production of a pencil of the type stated in which the sections of the bodies containing the marking points are so constructed as to enable the use of plastic material, thereby improving design effect and being more cleanly in use. Another object is a construction by which the sections of the barrel are normally held together and are removable one at a time when each marking point is worn away in use.

With these and other objects in view my invention comprises features of construction and parts hereinafter described and claimed.

In the accompanying drawings forming part of this specification, Fig. 1 is a side elevational view of my improved pencil; Fig. 2 is a side elevation at enlarged scale of one complete section of my improved pencil; Fig. 3 is a longitudinal central section of a portion of my improved pencil showing two of the barrel sections joined together; Fig. 4 is an end View at enlarged scale taken when facing the sleeve end of one section of the pencil barrel; and Fig. 5 is a side elevation of a portion of the string of integral marking points which is applied in the barrel for holding a series of sections of the pencil barrel together and which are adapted to be applied in use for marking purposes.

My improved pencil has a longitudinal series of sections A, which are adapted to be assembled and joined longitudinally together in the form of a cylindrical or other shaped pencil barrel B. Each section has a cylindrical sleeve I0 and an integral plug extended from the sleeve having a cylindrical portion II on one end and a forwardly pointed conical end portion I2. The sleeve and plug of each barrel section are hollow and provide a chamber i3 therein entering the rearward end of each barrel section. The inner diameter of the sleeve I0 of each barrel section substanthe companion plug' portion II on a rearwardly extending barrel section to' provide a ymated slip joint between each pair of sections. The cone I2 lal'so corresponds with the conical inner surface of each barrelsection to form a mating joint I4.v The joints thus produced assist in holding .the sections of the barrelrigidly togetherv in longitudinal alignment. *l y. Thevchamber I3 *thin each barrel section is extended forwardly so as to admit and tightly seat `the plug of a companion barrel section. In this marinera series'of sections B are adapted to be rigidly joined together and form a pencil barrel.

The inner surface of each sleeve I0 may be.

iiuted, knurled or serrated at I5 (Fig. 4), to assist in producing a tight gripping engagement between the sleeve and cylindrical plug portion of each barrel section. This gripping tendency assists in normally preventing the barrel sections from turning about each other and working loose.

lA series or string C (Fig. 5) of integral marking points I6 composed of graphite or other suitable marking material are secured longitudinally through the jointed barrel sections, when the latter are assembled in barrel form, one marking point being allotted to each barrel section and secured by its body I1 axially in a longitudinal passage I8 in each conical forward end portion I2. The forward end is integral with the rearward body portion of each marking point in advance thereof and thus produces aweakened node I9 (Fig. 5) so that the series of points which are integral are adapted to be severed at a weakened node or junction when each barrel section is twisted and forced apart by the application of sucient force. The body II of each point is secured by the application of suitable adhesive in the joint between the body of each marking point and the wall of the passage I8 in each barrel section. In this manner through the frictional engagement between the plugs and the sleeves and conical seats of the barrel sections and the additional support rendered through fastening the unbroken series or string of marking points in the conical ends or cones l2, the sections B are adapted to form a rigid pencil barrel and the sections of the barrel are adapted to be severed and removed as fast as each point is worn away in use.

The pencil thus provided is favorable for the use of plastic material in its construction, said material supplying means which is not only atmeans and applied to uses other than those above set forth within the spirit of the invention andl v. l Y

the scope of the following claims.

I claim: l f V1. A pencil comprising a barrel having a longitudinal series of substantially similar sections,

each barrel section having a cylindrical bodyV formed with a longitudinally disposed socket in one end and a corresponding plug on its opposite end, said sections being removably joined .and mated together by the insertion of their plugs in said sockets, and. a string of integral marking points, each point being rigidlysecured in and projecting from. the forward end portion, of one oi said plugsk when said sections are joined and said string of points serving to normally assist in holding said sections assembled longitudinally and providing a weakened frangible node at thetip vend of each point so that each barrel section may be severed from, an adjacentsecton.

- Y 2. A pencil comprising abarrel having a longitudinal series of marking point sections successively removable as each point is worn away in 35 use, each section having a cylindrical hollow body on its rearward end and a plug on its forward end, said plug having a tapering forward portion and said sections being normally joined by slip joints between the plug on one barrel section being inserted coaxially in the sleeve of a companion barrel section to produce an extended barrel, each sleeve and companion plug having a serrated surface therebetween whereby gripping effect is increased to assist in holding the barrel sections together, and a marking point on each barrel section, tightly socketed in each tapering end portion thereof and extended therefrom.

3. A pencil, comprising a barrel having a longitudinal series of marking point holding sections successively removable endWise as each marking pointis worn away, each typical section having a `sleeve and a plug extending longitudinally thereon, said plug being provided with a longitudinal body portion and a conical end portion and chambered longitudinally through the sleeve and into said plug, a corresponding barrel section having its cylindrical section and its conical portion seated in the corresponding sleeve and conical portion of the rst named barrel section, whereby the sections are adapted to be rigidly and separably joined together longitudinally, and a series of. markingv poi-nts respectively seatedV in the outer end portions of the conical portions of said barrel sections and projecting forwardly therefrom.

JAMES W. MCPHEE.

No references cited.