US1890873A - Pencil - Google Patents

Description

F. WAGNER Dec. 13, 1932.

PENCIL Filed Oct. 22, 1929 BY W INVENTOR Patented Dec. 13, 1932 PATENT OFFICE f UNITED STATES PENCIL Application led ctober 22, 1929. Serial No. 401,429.

My invention relates to pencils of the mechanical back-turning t pe, in which thelead is advanced or retracte on the relative rotation of parts thereof by turning the head of the pencil opposite the lead.

The object of the invention is to provide an.

operating mechanism for pencils of the said type which is of great simplicity, easy of assembly, certain in operation, durable and economic, and which may be adapted for use in pencil easings or barrels of varying length.

In the attainment of the foregoing ob3ect I have provided a screw sleeve and a separable hollow holder therefor, with simple '15 means which cooperate to enable the said arts to be easily combined, and yet rmly held together in use, the screw sleeve being adapted to be telescoped within the holder to a greater or less extent, with all theadvantages flowing therefrom- The foregoing results in a very simple assembling operation, saving a great amount of labor and making a rigid joint which prevents injury to the mechanism in the assembling operation, and by not permitting the spiral action to bend in rotating because of the perfect alinement effected, prevents the breakage of the lead inserted.

In the accompanying drawing in which f like reference numerals refer to correspondin parts, l y

gFig. 1 is an elevation of a pencil embodylng my improvement;

Fig. 2 is a vertical section of the same showing the parts in operative'position;

Fi 3 is an exploded view showing in section ne main parts illustrated in Fig. 2; and Figs. 4 and 5 are sectional views on the correspondingly numbered lines of Fig. 2. Referring to the drawing, a tubular barrel or casing is indicated at 1, having Athe usual taper 2, and removable cap l3. 'Mounted within the barrel is the operatmg mechanlsm which consists of the screw sleeve 4, its detachable holder 5, tip 6, anchoring block 7 and enlargement 8, the upyr end 9 of the holder 5 forming a seat for t e cap 3, and the -tip portion 6 being attached to the tapered end of the casing. A All of the parts mentioned are well known in the art and are of usual construction with the exception of screw sleeve 4 and holder 5. In the screw sleeve 4 is mounted guide tube 16 the upper end of whch is seen in Fig. 3 projecting from the screw sleeve. It is provided with a longitudinal slot 17. A clutch 18 is carried withln this guide tube, is adapted to freely move therein, and is provided with a member 19 which is adapted to extend through the longitudinal slot 17 and slidably 00 engage the spiral slot 20 of the screw sleeve. The member 19 is shown in Fig. 2 extending through the uppermost end of the spiral slot.

In accordance with my invention the screw sleeve is equipped with studs or extensions 05 l0 and the lower part of holder 5 is contracted or reduced as shown at 11, said part 11' being provided with an internal longitudinal groove 21, the cooperative relation f of these parts for the purpose desired being secured by so proportioning the circumference of the screw sleeve that it will snugly fit into the bore of the contracted portion of the holder, and the studs carried by it be received in roove 21. i s a result of these novel departures from other constructions in the pencil art, marked advantages result. The means for holding the said parts in association are extremely simple. Nevertheless in assembling the parts the assurance is certain that as soon as the contracted portion of the holder is forced over the screw sleeve and in Contact with the studs 10, the screw sleeve and holder are held in firm connection and perfect alignment. Furthermore these operating parts may be made to lit casings or barrels of diiierent lengths. For use'in a barrel of average pencil length' the screw sleeve is inserted into the holder to the point necessary to bring the studs 10 into engagement wlth the holder. When intended for use in casings of shorter length the holder is forced along the screw sleeve until the combined length of the screw sleeve and holder as so adjusted will adapt them for use in the size of casing desired.

At l2 is shown a safety clip. In my improved pencil this clip is mounted without the use of rivets or prongs'. It is so bent that l its base or inner end 13 is passed through 100 opening 14 in the casing and is rmly clinched between the bushing 8 and casing 1. There is nothing novel in the operation of the pencil or the mounting of the lead. It is obvious that when the parts are in operative osition and the lead such as 15 is mserted 1n the tip of the lead holder, the rotation of the cap 3 attached to the upper end 9 of the holder will advance or retract the lead as 10 desired. It is clear, too, that the holder. may

be used to hold extra leads, and that its enlarged end constitutes a socket for the reception of an eraser.

What I claim as new and desire to secure by Letters Patent of the United States is:

In a pencil of the character described a tubular casing tapered at one end, a holder having a contracted portion adapted to be inserted therein at the untapered end, said contracted portion being provided with an internal longitudinal groove, an enlargement on said holder adapted to make frictional contact with the casingadjacent the said end an anchoring block closing the tapered end ofthe casing and having feeding mechanism mounted on its inner end and a tip on its outer end, said feeding mechanism comprising a spirally slotted screw sleeve, a slotted guide tube within said sleeve and a clutch 3o carried within the guide tube and coo rating with said sleeve and tube by means oi member thereon extending through the slots in the guide tube and sleeve, and studs on said screw sleeve for holding the feeding mechanism and holder in adjustable alignment, v

substantially as and for the purpose set forth.

In testimony whereof, I have signed my name to this specification. l FRANK WAGNER.

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