US1691981A - Magazine lead pencil - Google Patents

Description

F. E. MAYOL MAGAZINE LEAD PENCIL Filed Sept. 19, 1927 Nov. 20, 1928.

Patented Nov. 20, 1928. I

UNITEDQSTATES FBANKE. MAYOL, OF FBANCONIA, NEW HAMPSHIRE.

MAGAZINE LEAD PENCIL.

' Application filed September My invention relates to mechanical lead pencils of the lead-propelling type, and its chief object is to provide a writing pencil of this class which shall be strong andv durable as well as positive in its operation, and yet be of such inexpensive construction as to ermit of a ver low cost of manufacture, tiiereby making it possible to place the pencil within the price reach of school children and others who cannot afford to pay the price now required to buy any of the mechanical pencils of dependable mechanism now on the market.

Another object of my invention-is to provide a magazine pencil which may, without any mechanical change of construction other than increasing the dimensions of its several parts, be adapted to the use of crayons which have a wax base or body of the type now in general use in school-rooms and studios. My invention will provide a very satisfactory crayon holder, with the added feature of feeding the crayon through the writing point as needed.

Still another object of my invention is to provide a breech loading magazine pencil, thereby securing to it the obvious advantages that accrue to inserting the writing lead at the breech, as opposed to the muzzle loading type of magazine pencil which requires thatpractically the entire length of writing lead be forcedinwardly through the writing point before the pencil is ready for use, which frequently results in soiling the hands, in breaking the lead before it is fully inserted, and in clogging the magazine. In my pencil the lead is dro ped lengthwise into the magazine through a lireechway, makingit unnecessary to soil the hands, and practically eliminating the possibility of breaking the lead or of clogging the magazine. Also, in my pencil, it is not necessary to operate the propelling mechanism reversely to its inwardmost limit to clear the lead chamber before the lead can be inserted, which is a necessary operation with all muzzle-loading mechanical pencils.

With these objects in view, my invention consists in the combinations and arrangements of parts hereinafter described and claimed. v

The invention is illustrated in the accompanying drawing, which forms a part of this specification, and in which,

Fig. 1 is a general view with sections broken or cut away to expose the several parts.

Fig. 2 is a plan of the breech end.

Fig. 3 is a side view plan of the plunger.

19. 1927. Serial No. 220,292.

Fig. 4 is the forward or mouth end of plunger.

Fig. 5 is'a cross section of the propeller tube imd barrel taken on the line 3030 of Fig. 6 is a cross section of the assembled mem ers of the propelling mechanism taken on the line O0 of Fig. 1.

Fig. 7 is the propeller tube as it would appear 1from the side reverse to that shown in Fig. 8 is a plan view of the forward end of the propeller tube.

Fig. 9 is a plan view of the breech end of the propeller tube.

' Fig. 10 is the barrel as it would appear from the side reverse to that shown in Fig. 1.

Similar numerals refer to similar parts throughout the several views.

M y pencil comprises a barrel 1, said barrel having a longitudinal slot 2 extending along one side and a multiplicity of equidistant transverse perforations 3 extending serially along its other side, the barrel terminating at the forward end in a tapered Writing tip 5, said writing tip having opposite longitudinal slots 6 which divide the writing tip into opposed slightly flexible sections or grippers 7, an out-turned flange 4 being placed between the writing tip and the forward end of the barrel proper; a propeller tube 8, said propeller tube having a longitudinal slot 9 extending along one side and a plurality. of equidistant perforations 10 extending serially along its other side, the propeller tube terminating at its forward end in an outturned flange 11, and at its rear end in a flange cap 12, said flange cap being tapped through its center to provide a breechway 13; a tubular plunger 14 having, as a continuation of one of its sides, a flexible shank 15, said flexible shank terminating rearwardly in a detent 16, said plunger also having, as'a continuation of its opposite side, a flexible shank 17, said shank being somewhat shorter than the said other shank, and terminating rearwardly in a click or detent 18, and an outer casing composed of a forward section 19 and a rear or breech section 20. The said forward section has a tapered writing tip 21 and a termination rearwardly of a shoulder 22 and a shank 23. Said forward section has a flange chamber 24 and a slide chamber 25, an inturned flange 30 being interposed between the said chambers. The breech section of the outer casing is a tubular member having its forward end or mouth 26 open for the reception of the shank 23 of the forward section of the casing. The rear end of the breech section is closed exce t for the breechway 13. There is a flange c amber 27 in'the breech section, and between the sand flange chamber 27 and the main chamber 28 there 1s an inturned flange 29.

More articularly described, the barrel 1 fits slide 1 into the propeller tube 8, and the said arrel. The operating position of the barrel in its relation to the operating position of the propeller tube is clearly set orth in Fig. 5, in which it will be noted that the longitudinal slot 2 of the barrel comes directly opposite the plurality of perforations 10 of the propeller tube, and that the slot 9 of the propeller tube comes directly 0 posits the multiplicity of perforations 3 of t e barrel. Reference to the cross section drawin Fig. 6 will provide a clear understanding 0 the ositional relationship of the perforations 3 o the barrel to the perforations 10 of the propeller tube. It will be apparent to anyone versed in the art that the series of stops or ribs 33 and the intervening perforations 10 constitute a ratch along one side of the propeller tube, and, likewise, that the series of stops or ribs 34 and the intervening perforations 3 constitute a ratch along one side of the barrel.

The propeller tube ratch actuates the detent 16 and the shank 15 of the longer when the propeller tube is subjects to a reciprocal sliding, or a pull and push operation. The detent 18, controlled by the shank 17, acts forwardly upon the ratch of the barrel.

The plun er '14 is of an outside diameter which permlts of its being inserted slidably into the barrel through the breechway 13. The writing lead is inserted into the plunger at the open or month end 31 of the plunger.

The lead and plunger, when so combined,-

form a sort of a cartridge, which is'inserted into the barrel throu h the breechway 13. When the plunger is fully inserted into the breechway, the detent 18 engages in a perforation 3, thereby making it impossible for the plunger to slide rearward or to be withdrawn from the breechway.

To operate the pencil, that is, to propel the lead forward, the propeller tube is drawn rearward as far as the slide chamber 25 will permit, as indicated by the broken line 32. As the propeller tube thus slides rearward over the barrel, a stop 33 slidably engages the detent 16, thereby flexing inwardly the shank 15, causing the stops 33 of the ratch to pass over the detent 16 which is held lon tudinally stationary in the barrel by the etent 18 engaging in a perforation 3. The

pencil is now open. When the propeller tube 1s pushed forward over the barrel to its forwardmost, or closed, position, as indicated by .ward movement of the plunger, as it is propolled by the ratch of the propeller tube,

causes the shank 17 to flex inwardly, thereby permitting the detent 18 to pass frictionally a over the stops of the barrel ratch. said rope ler tube slides operatively over the It will be noted, by reference to Fig. 6, that the plunger is kept from turning, so that the detents 16 and 18 are held in alignment with the ratches respectively of the propeller tube and of the barrel, by the slidable contact of the sides of the detent 16'with the sides of the barrel slot 2, and that once fully inserted into the barrel through the breechway, the

plunger can move only in one direction, that direction being forward or toward the writing tip of the pencil.

When the writing lead is exhausted,the forward end of the plunger protrudes from the writing tip, whence it is withdrawn. Another lead is inserted, as described, propelled forward until the writing end of the lead protrudes the desired length from the writing ti and the pencil is again ready for use.

Re erring again to the outer casing, it will be noted that the flange cap 12 of the propeller tube occupies the flange chamber 27 of the breech section of the outer casing, said flange cap being held immovable longitudinally by the inturned flan e 29. I preferably use this means to ancl a or the propeller tube to and within the breech section of the;

outer casing with which it co-operates, the combination of the propeller tube and the breech section of the casing being, in eflect, an o erating unit. When the propeller tube is su jected to a reciprocal slidin operation over the barrel, as described, the reech section of the outer casing slides reciprocally over the shank 23 of the forward section of the outer casing. This is indicated by the broken line 35, the forward end of the breech section coinciding with the shoulder 22 of the forward section when the pencil is closed and ready for use.

' The flange 11 of the propeller tube slides frictionally in the longitudinal chamber 26 of the forward section of the outer casing,

when the lead is propelled forward, as indland the walls of its chamber to permit of the flange being rotated within 1ts chamber. This precaution prevents the warpin or breaking of any of the several parts 0 the pencil should an effort be made, by anyone unfamiliar with the pull and push operation of the pencil, to rotate the propeller tube, an operation common to practically all magazine pencils.

, 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 myself of such variations and modifications as come within the scope of the appended claim.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

A magazine pencil comprising, in combination, a tubular plunger having an open forward end for the insertion of a writing lead, and parallel rear-extending flexible shanks, said shanks terminating in oppositely directed detents; a barrel having a multiplicity of perforations along one side for engaging said plunger, and along its opposite longitudinal se ment a slot for operatively supporting sai plunger; a propeller tube having a plurality of perforations along one side for actuating said plunger, said propeller tube surrounding and sliding operatively over said barrel and said plunger; an outer casing having a slidable breech section, said breech section having a breechway in the end thereof for the inward passage of a writing lead; and means for fastening said propeller tube and said barrel to, and within, said outer casing, all substantially as set forth.

In testimony whereof I hereto fix my signature.

FRANK E. MAYOL.

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