US1613810A - Mechanical pencil - Google Patents

Description

J. C. WAHL lzcHANIcAL Pliner;I

Filed April 28, Hg@

, 20 pencil, and

Patented Jan. 11, 1927.

JOHN c. WAHL, or cHIcAeo, ILLrNoIs,

4ASSIGNOIR. .T0- THE WAHL COMPANY, 0F

CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

MECHANICAL PENoIL.

Applicationled April 28, 1922. Seriall No. 557,198.

My invention relates to mechanical pcncils.

The object of the present invention is to rovide a device of the class described which 5 will be simple of construction and operation and contain no involved or intricate parts which would likely break in ordinary usage.

Theinvention comprehends the re1ation ing of a feed mechanism to the pencil body and to details of construction hereinafter specificallypointed out and described. I

The invention consists in the .combinations and arrangements of parts hereinafter described and claimed.`

The invention will bei best understood by reference to the accompanying drawings forming a part of this specification.

Referring tothe drawings 't Fig. 1 is a side elevation of my improved Fig. 2 is a longitudinal sectional view of Fig. 1.

' In the drawings, the numeral 10 indicates a barrel bein tapered at 11 to form, the

tip 12 througi which a lead is adapted to be propelled.

an inner sleeve or tube 13 is provided which extends from the rear end of the barrel 10 to the union member 14, said union member being fashioned with a central longitudinal bore 33 having an expanded Vthreaded portion 34 at its 'forward end for. union with the threaded portion of the lead guide, \also said union member is conically formed at 35 its rear end as at 35 for y'the purpose of centering the lead with respect to a lead peller hereinafter mentioned.. It vwill be Y seen that the threads of the sleeveor tuber 13- are rolled thereon. the entire length and the union member 14 is so fashioned as to re ceive the threaded sleeve-13.

Referring specially to the operating mechanism )for propelling a lead through the tip 12. magazines 15 for extra lea-ds are pro- .115` vided; and these magazines are utilized as an actuating member for moving thev follower or feed wire, hereinafter to be described, through the lead guide. The magazines. are positioned opposite each other, the forward end being fixedly attached'to the'magazin'c head 16, said magazine head 16 acting as a plug to prevent theextra leads from falling out of ,the magazines, it being also fashioned* to form a neck 17 'which acts b5 as. a guide for the lead --propellerf The In the construction illustrated pro.

rear ends .of the magazines are encircled bv a threaded collar 18 which is fixedly attached thereto and acts to hold them in position, the threads of said collar being adapt- Iany other desired manner, tothe inner face or wall of the barrel or casing 10, and the sleeve 13 may be fixed with relation to the barrel 10 either by being ixedly connected to the collar 31-` or by having frictional engagement with the interior of the barrel as desled. Y

The mechanism constituting the follower which forces the lead out from the end of the'pencil throughthe tip 12, consists of a member 23 in the nature ofv a stiff Wire which member terminates at its rear end in.

an enlarged head 24 which constitutes a cross head. .This cross head is formed exteriorly with threaded surfaces which are adapted toengage the threads in the sleeve or tube 13.v

It is obvious, as the cross head is rotated, by turning the cap 2O in a clockwise direc,` tion, which in turn rotates the magazine, the cross headfwill move downward and. force the follower or feed rod forward with the result that `-thelead isfed out through thc tip of the pencil.

It is thought that the-above brief description as to the feeding mechanism for advancing the lead will suice as no claims are vmade specifically to this construction except in conjunction with associated parts herein described; the same is more fully and completelv described in Patent No. 1,130,741 grantedto Charles R. Keeran under date of March `9, 1915.

The tip 12 is exteriorly fashioned to provide a general inclination as indicated at 24 that is in conformity withthe general inclination of the tapered portion 11 ofthe barrel 10. 25 indicates the manner of' fashioning the ex.- tremeend ofthe ti by an inward deflection from the general e thereof indicated at 24- 25 lldicaf a rectilinear shoulder offset at the rear end ofthe tip, provided for abutment entry into the end of the tapered portion 11 of the barrel 10 and for snug seating within the interiorly beveled portion 27 thereof.

28 indicates a lead passing through the centrally disposed bore Within the tip. 29 refers generally to a 'tensioning member adapted to be fitted to the inner opening of the tip. The tip, per se, illustrated is merely shown in the general outline `and no speciallreference will be made thereto'hereinafterv as it is not included in the improvement herein to which the claims are directed; a more complete description can be found in applicant-s pending-application dated October 27, 1921, Serial No. 510,813.

31 indicates a lead guide permanently affixed to the tip 12, said lead guide being exteriorly threaded at its upper end to engage the threads 34 in the union member 14.

A clip 35', consisting of a prong 36 and a base or supporting portion 37 is provided. The base 37 has a flange 38 swedged thereon, and said flange is adapted to contact with the inside of the tube 10.- The thick por- .tion of the base 37 is. adapted to fit' into a hole 39 which is punched in the barrel 10,

and the flange 38 prevents the withdrawing of the clip 35` from the barrel 1Q. I l

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but.

desire to avail myselfA of such variations and modifications as come within the scope of the appended claims.

Having described my invention, what.,I claim as new and desire to secure by Letters Patent is 1. In a mechanical pencil aV barrel, a threaded lead propeller, a sleeve vhaving threads cooperable. with said propeller,

means on said sleeve to limit'its advance,V

toward the tip ofthe'barrel, a tip adapted to seat in the orward end of the barrel, a

a lead guide havingscrew threaded engagement with the f inner end of said sleeve, an internally threaded extension on said union member, a tip having an external taper similar to and continuing the taper of the end of'the barrel, and a lead guide fixed at one end to the tip and at its other end hav-ing threaded engagement with the internally threaded extension of the union member.

'3.*In a Writing instrument a barrel tapered at one end, an elongated threaded sleeve fixed in said barrel, a union member extending into the inner end of saidsleevo and fixed thereto, a tip adapted to seat in the tip end of said barrel, and a lead guide fixed to the tip at one end and detachably connected to the union memberV at theothcr.

4. In a writing instrument a barrel tapered at one end, an elongated threaded sleeve in said barrel, a tip, a lead guide fixed at one end to said tip, a union member dev tachably -and removably connected to lsaid sleeve, one end of said lead guide being detachably connected to said union member.

5. In a mechanical writing instrument a barrel, an elongated thin metal sleeve fixed' in said barrel, said sleeve having threads pressed therein, a union member having external threads in threaded engagementwith the inner end of said sleeve, a tip. and a lead guide fixed at, one end to said tip and detachably connected at its other .end with said union member.

In witness whereof, I have hereunto subscribed my name.

- lJOHN CLWAHL:

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