US2332223A - Mechanical pencil tip - Google Patents

Description

2 Sheets-Sheet 1 r R E 1E H y. W M

Oct. 19, 1943. H. s. HAssELQuls-r l MECHANICAL PENCIL TIP Filed July 15, 1942 Oct. 19, 1943. H. s. HAssELQUlsT MECHANICAL PENCIL TIP 2 Sheets-Sheet 2 Filed July 15, 1942 fllll 'IIIIIIII |I|l||||| IIIIIIIII IIIIIIIIII IIIII] Patented Oct. 19, 1943 i i UNITED STATES PATENT OFFICE p MECHANICAL PENCIL TIP l 'I Hugo S. Hasselquist,` Oak Park, Ill., assignor to Joseph Dixon Crucible Company, Jersey City, N. J., a corporation of New Jersey Appiication July 15, 1942, sesame. 450,979

s claims. (o1. L20-ix)v A This invention relates to mechanical pencils and particularly to pencil tipsV 'for such'pencils.

At the present time mechanical pencil tips are usually made on automatic screw machines. This method o'f making tips is time-consuming, Wasteful of material and expensive.

This invention has for its salient object to provide a'construction of pencil tip that is attractive lin appearance, will use a minimum amount of material for its manufacture, can be made at a higher rate of speed of production and from a cheaper grade or type of metal than the ordinary machined pencil tip.

Another object of the invention is to provide a mechanical pencil tip formed from sheet metal and so constructed that the 'lead will be supported thereby and furthermore. somade that the tip will not obscure the 4viewfof the Writing from the observer.

Another object of the invention is to provide a mechanical pencil tip so constructed that it is particularly adapted for use with a ruler or straight edge and the pencil tip will not interfere with the use of the pencil inthis manner or fail to adequately support the lead as is the case i with the ordinary mechanical pencil tip.

Further objectsof the invention will appear from the following specification taken in connection with the drawings which form a part of this application, and in which:

Fig.`1 is an elevational viewA of a portion of a mechanical pencil provided with a pencil tip constructed in accordance with the'invention;

Fig. 2 is a view similar to Fig. 1 but showing the outer end of the pencil and tip in section;

Fig. 3 is an enlarged sectional elevation of the pencil tip; Y

Fig. 4 is an enlarged sectional elevation showing further details of the pencil construction and a modified form of tip constructed in accordance With the invention;

Fig. 5 is a transverse sectional elevation taken substantially on line 5 5 of l looking in the direction of the arrows; f

Fig. 6 is a view similar to Fig. 4 but illustrating another form of tip constructed in accordance with the invention; s

Fig. 7 is a transverse sectional elevation taken substantially on line 'I-'I of Fig. 6 and looking in the direction of thearrows;

I Fig. 8 is a View similar to Fig. 7 but showing a modified form of cross section; v

Fig. 9 is a view similar to Figs. 4 and 6 and illustrating a still further modified form of the 4tip embodying the invention;

Fig. 10-is a transverse sectional elevation taken substantially on line I-III of Fig. 9 looking in the direction of the arrows;

Fig. 11 is an elevational View, partly in section, of another form of pencil tip embodying the invention; and f Fig. 12 is a bottom end shown in Fig. 11.

The mechanical-pencil and the lead-holding and feeding means 'may beconstructed in any desired 'manner and form no part of the present invention. In the form of the invention shown in Figs. 1 Vto 3 inclusive, there is shown a pencil body I0 having the usual conical end portion II. The pencil body is provided with a sleeve l 2 of the usual construction.

The pencil` tip as shown in enlarged section in-Fig. 3 is formed of sheet metal and comprises a cylindricalportion I3 which is received in the outer end of -the sleeve I2, an annular flange or shoulder I4 `havingv a seat i5 for the outer .end ofthe pencil body, a tapered portiony I6 which merges into a cylindrical portion I'I, and a second tapered portion I 3 which merges into la reduced cylindricalvend portion I9.

i As clearly shown in Figs. 2 and 3, the ange I4 extends `outwardly at an acute angle to the cylindrical portion I3 of the tip, forming an under cut. Moreover, the outer end I5 of the pencil body or cone II is beveled or tapered. The under` cut flange I4 Vand the tapered end l5 coact to force thev body or cone I I into gripping View of the structure vfrictional engagement with the cylindrical porvtion I3 of the pencil tip.v

As clearly illustrated in Fig. 2, the lead 20 which is supported and fed in any suitable manner in the pencil'body I6 ext-ends through the pencil tip and ts snugly within the reduced cylindrical end portion I9, this cylindrical end portion forming a firm support for the lead.

, The construction of tip above described is` at.-

`tractive in appearance and by reason of the progressively reduced diameter toward the cuter end, the tip is so Vformed that it does not lobstruct the 'writers view of the writing, and, furthermore, the shape Aci the outer end portion I9 provides a construction which adapts rthe pencil particularly for use with a straight edge or ruler.

In the form of the invention illustrated in Figs. 4 and 5, the pencil body 3Q has a tapered orconical end portion 3| having a sleeve 32 which receives a tubular upper end 33 of the pencil tip. The tip has a laterally extending flange or shoulder 34 which forms a seat for the end 35 of the conical end` portion 3I of the pencil. The flange or shoulders 34 in Figs. 4, 6 and 9 may be under cut and the end 35 of the conical portions 3l may be beveled, if desired, as in Figs. 2 and 3. A tapered portion 36 of the tip extends downwardly from the shoulder 34 and merges into a reduced cylindrical portion 31, the end of the tip being further reduced to a cylindrical portion 38 which is dimensioned to receive the lead 39.

The pencil shown in Figs. l to 9 inclusive has a feed tube 4U provided with a spiral slot 4l which receives lugs 42 and 43. The lug 43 is carried by the upper end of a clutch tube 44 which in turn engages the upper end of the lead 39. 42 and 43 extend into a slot 48 in sleeve 32.

The lug 43 is carried by the upper end of an ejecting plunger 45 mounted in the clutch sleeve or tube 44.

The feed tube 40 is connected at its upper end to the eraser cap in the usual manner and as the cap is rotated the spiral slot 4| of the tube 40 will feed the clutch tube 44 downwardly, thus Lugs for the lead and also for the feed tube 44 when the tube has been fed inwardly to the extent illustrated in Figs. 4, 6 and 9.

The pencil tip is formed of sheet metal by suitable drawing operations which form no part of the present invention and are therefore not described. It will be obvious that a very considerable saving in time and material is effected by constructing the tip of sheet metal, thus providing a cheaper as well asa more attractive construction.

' Although certain specific embodiments of the invention have been particularly shown and described, it will be understood that the invention is capable of further modification and that further changes in the construction may be made feeding the lead from the reduced tubular portion 38 of the pencil tip. f

From the showing in Fig. 4 itY will be noted that when the lead has been nearly exhausted and only a small portion remains in the pencil, the clutch tube 44 will be disposed at the lower end or outer end of the pencil tip, the end portion of the feed tube being positioned within the cylindrical portion 31 of the tip. This portion 31 forms-a guide and lateral support for the tube 44 and for the lead carried thereby, thus preventing the tube 44 from undue lateral displacement.

In the form of the invention illustrated in Fig. 6, the clutch tube 44 is supported in a similar manner by a plurality of inwardly extending portions 5D of the pencil tip, these portions being formed by longitudinally grooving the portion 0f the pencil tip between the portions 35 and 38. In Fig. 3 there are three inwardly projecting portions 50, and in Fig. 7 four such portions are provided.

In Figs. 9 and l0 the clutch tube 44 is guided and held against lateral displacement by an annular inwardly extending projection 5| which is formed in the portion 36 of the tip by forming an annular groove therein.

The form of the invention shown in Figs. 11 and 12 was developed particularly for the push type of pencil in which the lead is not retracted.

VThe upper end 55 of the tip is threaded and is arranged to be threaded into the outer end of the pencil body. The flange 56 is under cut as in Figs. 2 and 3. The portion 5l is indented longitudinally to form guides for the pencil clutch sleeve. The lower end 58 and a portion of the part 51 are slitted as shown at 58, forming a friction grip for the lead. A

In the form of the invention first described namely, that illustrated in Figs. 1 to 3 inclusive, the clutch tube is not shown since it is disposed in the body portion I0 of the pencil. However, this clutch tube 44 when fed downwardly to the position shown in Figs. 4, 6 and 9, would have its lowei1 end positioned substantially as shown in Fig. 9 or within the portion 52 of the tip and it will thus be seen that this portion would, by its proximity to the lower end of the clutch tube, provide means for preventing undue lateral displacement of the feed tube.

From the foregoing specication it uu'll be evident 'that a simple, practical and economical construction of pencil tip has been worked out and that this tip will form an eflicient support without departing from the spirit or scope of the invention as expressed in the following claims.

` I claim:

l. In a mechanical pencil having a clutch sleeve for receiving and supporting the lead and means to feed said clutch sleeve and lead, a pencil tip formed of sheet metal and uniform in thickness throughout its length having a cylindrical end portion for snugly receiving and supporting the outer end of the lead and having a surface intermediate the ends of the tip dimensioned to receive and guide the outer end of the clutch sleeve and prevent lateral displacement thereof when the clutch sleeve has been fed into the tip.

2. In a mechanical pencil having a clutch sleeve for receiving and supporting the lead and means to feed said clutch sleeve and lead, a pencil tip substantially uniform in thickness throughout the length thereof and Vhaving a cylindrical end portion for snugly receiving and supporting the outer end of the lead and having a cylindrical portion of reduced diameter intermediate the ends of the tip dimensioned to receive the outer end of the clutch sleeve and prevent lateral displacement thereof when the clutch sleeve has been fed into the tip.

3. In a mechanical pencil having a clutch sleeve for receiving and supporting the lead and means to feed said clutch sleeve and lead', a pencil tip substantially uniform in thickness throughout the length thereof and having a cylindrical end portion for snugly receiving and supporting the outer end of the lead and having an annular surface intermediate the ends of the tip dimensioned to receive the outer end of the clutch sleeve and prevent lateral displacement thereof when the clutch sleeve has been fed into the tip.

4. In a mechanical pencil having a clutch sleeve for receiving and supporting the lead and means to feed said clutch sleeve and lead, a pencil tip having a cylindrical end portion for snugly receiving and supporting the outer end of the lead and having inwardly offset supporting means intermediate the ends of the tip dimensioned to receive and guide the outer end of the clutch sleeve and prevent lateral displacement thereof when the clutch sleeve has been fed into the tip.

5. In a mechanical pencil having a clutch sleeve for receiving and supporting the lead and means to feed said clutch sleeve and lead, a pencil tip having a cylindrical end portion for snugly receiving and supporting the outer end of the lead and having an annular internal shoulder forming annular supporting means intermediate the ends of the tip dimensioned to reprevent lateral displacement thereof when ther clutch sleeve has been fed into the tip.

7. A pencil tip made of sheet metal, said tip having an outwardly extending flange inter- CII mediate the ends thereof, one end of the tip b-eing tubular and dimensioned to iit in the end of the pencil body and the other end being tubular and reduced in diameter to form a land'to support the leads, the flange extending outwardly at an acute angle to the tubular end portion of the tip.

8. A pencil tip made of sheet metal, said tip having an outwardly extending ange intermediate the ends thereof, one end of the tip being tubular and dimensioned to t in the end of the pencil body, the flange extending outwardly at an acute angle to the tubular end portion of the tip.

HUGO S. HASSELQUIST.

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