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Publication numberUS2518128 A
Publication typeGrant
Publication dateAug 8, 1950
Filing dateOct 14, 1947
Priority dateOct 14, 1947
Publication numberUS 2518128 A, US 2518128A, US-A-2518128, US2518128 A, US2518128A
InventorsDufilho Leon G
Original AssigneeDufilho Leon G
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Telescoping pen or pencil
US 2518128 A
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Description  (OCR text may contain errors)

1950 L. e. DUFILHO 2,518,128

' TELESCOPING PEN 0R PENCIL Filed 001;. 14, 1947 lNVENTOR. Leon G. Dufilho X4Azz V ATTORNEYS gs PATENT OFFICE p; 'ITELns cQinfGrEN R PENCIL I Leon Dufilho, ShrevepgflyLa,

Application October 14, 1947, Serial No. 779,747

This invention is a telescoping pen or pencil, preferably of the type having linear graduations. Such a pen or pencil can be readily carried in the pocket in telescoped position, and readily extended into position for measuring or writing or both.

Telescoping pencils provided with linear graduations are broadly old. The principal object of the present invention is to provide a simplified and improved construction for this type of pencil, susceptible of quantity production at low cost.

Another object of the invention is to provide animproved joint for the telescoping sections, whereby the sections are held in alignment so that they will slide smoothly in and out of each other.

Another object of the invention is to provide a telescoping pen or pencil having telescoping sections wherein each section has at least one fiat side and is provided with in-struck or out-struck abutments. These abutments, by virtue of the fiat sided construction, are held in alignment with each other, so that they come into engagement when the pencil is extended and serve as abutments for limiting the outward movement of the telescoping section. These abutments are accurately positioned, so that when they are in engagement, the linear graduations on the sections are accurately positioned with respect to each other.

The invention will be further described in connection with the accompanying drawing, illustrating the preferred construction.

In this drawing, Fig. 1 is a perspective view of the improved telescoping pen or pencil and Fig. 2 is an enlarged sectional view taken on the line 2-2 ofFig. 1.

Referring now to these drawings, the pen or \pencil comprises a plurality of tubular telescoping sections 2, 4 and 6 for example, each successively larger, so that they telescope together,

The end of one end section is provided with a writing tip 8 and the end of another end section is provided with the usual eraser l0.

The telescoping sections are each provided with at least one flattened side, so that they slide in and out, but cannot be rotated with respect to each other. In the construction illustrated, four flat sides are shown, but evidently tubular units having less than four or more than four sides could be used, utilizing triangular, pentagonal or hexagonal tubular units, for example.

Coming now to an important feature of the invention, one of the telescoping sections, such as 4, is provided with one or more out-struck lugs 1 Claim. (Cl. 33-161) or abutments l2, while the companion telescoping section 6 is provided with one or more outstruck lugs or abutments I4. The abutments l2 and I4 are accurately positioned with respect to the linear-graduations l6 on the several sections of the pencil, so that when the pencil is extended, these lugs come into engagement and provide limiting stops for accurately positioning the telescoping sections with respect to each other, whereby the linear graduations on the several sections are accurately positioned with respect to each other.

The outermost surface of lugs I2, and the innermost surface of lugs I4 also are in slidable, frictional engagement with the surface of the companion telescoping section, thereby providing guide surfaces for maintaining a snug fit between the sections, for keeping them in alignment and thereby providing a continuous slidable contact for preventing them from wobbling with respect to each other.

In order further to maintain a snug, slidable,

frictional fit between the sections, a marginal portion or lip, such as l3, on section 6 for example, is bent inwardly to provide a slidable bearing surface which engages frictionally on the outer surface of its companion telescoping section 4, which also aids in maintaining the sections in snug and secure sliding engagement.

Therehas thus been provided a telescoping pen or pencil, provided with linear graduations, which can be manufactured in quantity and which by virtue of the lugs and abutments are maintained in snug, slidable, frictional engagement and which, particularly by virtue of the engagement-of the positioning lugs against each other, accurately position the linear graduations with respect to each other when in extended position.

While the invention has been described in some detail, it should be understood that the dis-' closure is illustrative rather than restrictive of the invention, and that it may be carried out in other ways.

I claim as my invention:

A telescoping writing instrument comprising a plurality of nonrotating telescoping tubular sections of a progressively varying size provided with linear graduations, one end of each section being adapted to be inserted in one end of each larger section, the section receiving end of each section being provided with an instruck lip extending toward the section to be received, each section being provided at the section receiving end on the side adjacent the instruck lip with an instruck lug spaced inwardly from and extending oppositely from said instruck lip, each section being provided near its inserted end and on the same side as said instruck lip and said instruck lug with an outstruck lug extending toward the opposite end of the section and being adapted to abut the instruck lug of the next section, whereby the sections are prevented from pulling apart, each of said instruck and outstruck elements being provided with a surface parallel to the surface ofthe tubular sections, whereby three hearing surfaces are provided for slidably telescoping said sections along a straight line independent of the extent of telescoping.


REFERENCES CITED UNITED STATES PATENTS Number Name Date 300,346 Collard June 17, 1884 575,671 Watts Jan. 19, 1897 648,576 Taylor May 1, 1900 960,151 Blumenthal H May 31, 1910 1,050,733 Greathead Jan. 14, 1913 FOREIGN PATENTS Number Country Date 13,617 Great Britain June 18, 1903 'A. D.'.1903

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US300346 *Apr 19, 1884Jun 17, 1884 Eichaed m
US575671 *May 23, 1895Jan 19, 1897 Telescopic measuring-rule
US648576 *Nov 23, 1899May 1, 1900William B TaylorExtensible measuring-rule.
US960151 *Jul 31, 1909May 31, 1910Harry BlumenthalTelephone-support.
US1050733 *Dec 21, 1911Jan 14, 1913Frederick Charles GreatheadTelescoping pocket-rule.
GB190313617A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2623317 *Sep 14, 1950Dec 30, 1952Horton Bristol Mfg CompanyLine guide for fishing rods
US2655728 *Dec 10, 1951Oct 20, 1953Cook Roy WTelescopic chalk line device
US2838705 *Dec 3, 1953Jun 10, 1958Westinghouse Electric CorpColor-corrected reflector high pressure mercury vapor lamp and method of preparing
US3209595 *Jul 18, 1961Oct 5, 1965Ametek IncCombined temperature and pressure sensing apparatus
US3222789 *Apr 20, 1961Dec 14, 1965Nat Res DevLinear measuring instruments
US3531870 *Jan 31, 1968Oct 6, 1970Romancky George AChain saw measuring device
US5490335 *Jul 21, 1994Feb 13, 1996Chu; George H.Inside and outside diameter measuring gauge
US6418631 *Jun 23, 2000Jul 16, 2002John RamsthalerAdjustable measuring and marking device
US6502321Aug 25, 2000Jan 7, 2003Crain Enterprises, Inc.Pole section for surveying equipment
US6688012 *Aug 25, 2000Feb 10, 2004Crain Enterprises, Inc.Surveying pole with telescoping sections
US6711826Nov 27, 2002Mar 30, 2004Crain Enterprises, Inc.Pole section for surveying equipment
US6772526Aug 25, 2000Aug 10, 2004Crain Enterprises, Inc.Surveying pole
US6820342 *Jul 16, 2002Nov 23, 2004Feddynagh, Inc.Adjustable measuring and marking device
US8405643 *Jul 21, 2010Mar 26, 2013Shenzhen Futaihong Precision Industry Co., Ltd.Stylus
US20110234546 *Jul 21, 2010Sep 29, 2011Shenzhen Futaihong Precision Industry Co., Ltd.Stylus
U.S. Classification33/809, 403/63
International ClassificationB43K29/08, B43K29/00
Cooperative ClassificationB43K29/08
European ClassificationB43K29/08