US1702299A - Mechanical pencil - Google Patents

Description

Feb. 19, 1929.

E.G.E.HOGNER MECHANICAL PENCIL Filed Nov.18, 1925 mwsmmm` ..wm

Patented Feb. 19, 1929.

UNITED `STATES EINAB GUSTAF EVALD HOGNER, F STOCKHOLM, SWEDEN.

MECHANICAL PENCIL.

Application tiled November 18, 1925, Serial No. 69,872, and in Sweden November 19, 1924.

The present invention relates to lead pencils provided with a :feeding device for the leads. The moet advantageous application of the invention is to such pencils as are prow vided with a magazine for the leads. Said magazine may be constructed. in such a Way that the leads may be consecutively propolled to a central place in the magazine to allow them to be engaged bythe feeding delo vice, and propelled by said device to the place Where they are to be consumed, viz, at the point of the pencil. The feeding device may be adjustable in such a Way as to impart a forced movement to the parts of said device which have to feed thc leads, said forced movement effecting the feeding operation.

When a lead has been sulliciently advanced,

at least so much as to allov7 it to leave the magazine, a device, already T.vell known, will operate to release said parts of the mechanism from the imposed movement so as to allow the feeding device to be pulled or pushed and a fresh lead from the magazine to be advanced in front of the feeding device.

The present invention contemplates a device Which on pulling or pushing the feeding device restores this device to perform the forced movement which advances the fresh lead. l

The accompanying drawing shows an embodiment of the invention, and in this drawing:

Figure l is a view of an inner sleeve which contains the feeding device.

Fig. 2 is a longitudinal section ofthe complete pencil With parts in elevation.

Fig. 3 is a fragmentary sectional view of the pencil, illustrating the operation of the quick release mechanism.

Fi i is a fragmentary sectional view showing the feeding device at the end of its feeding movement.

Fig. 5 is a perspective vicvv of the sleeve and the feeding device of Fig. l.

Figs. 6 and 7 are cross sectional views on thc lines 6 6 and "7-7 of 2.

The pencil is provided with a sleeve B,

threaded along a certain part of its length and arranged to rotate Within a sleeve formao ing the shell of the pencil. By rotating the sleeves relatively to each other leads contained in the magazine will be advanced to the axis of the pencil and from this place theyY may be guided by a channel to the point ist of the pencil. p j

feeding pin or lead pusher G is rigidly attached to a crosshead H which is at one side provided with teeth adapted to engage the threads of the sleeve B and protrudes through a longitudinal notch J arranged in the Wall of a sleeve I adapted to be inserted in the sleeve B, the lead pusher being thus adapted to reciprocate in sleeve I. The other side of the crossheadis provided with a cam r and runs in a groove-shaped part K, which is arranged to slide, Within certain limits, in the sleeve I. At. the end of sleeve I adjacent to the point of the pencil said rooved part K may, when the sleeves Ban I are axiall separated, protrude, to some extent, throug said sleeve I, as at P. A novel feature of the invention as to this embodiment is a sto Z located in a special member C attache for instance by means of threads, to the Sleeve B; a projection s located on the part K protrudes through a longitudinal aperture t from the sleeve I. The projection s may be split and the groove K, in order to be more elastic, may be slotted at its bottom, While if desired, the projection maybe broadened to overhang the edges of the a erture t.

A novel feature of the invention is the fact that the sleeve I has, at one end, a larger diameter than alon the greater portion of its length. Said enarged portion W fits the internal diameter of the threading of the sleeve B. The smaller diam-eter of the sleeve I, above the enlargement, fits the circular hole formed by the edge d. In this way the projection sruns clear of the Wall of the sleeve B.

The arrangement operates as follows:

The sleeve I, with the channel member K, cross head H and pusher G assembled therein, is inserted in the sleeve B, which may be effected after removal of the member C button or handle threaded on the sleeve I,

whereupon the member C is slid overthe sleeve I and threaded to the sleeve B, the button then being replaced on the sleeve I. The assembling of sleeves B and I causes the channel member K to be retracted, from the projected position of Figs. 3 and 5 to` the position of Fig. 2, due to the end of sald channel member striking the tapered bottom of sleeve B. By relative rotation of the sleeves, the cross head H is propelled by the threads of the sleeve B, and in this manner the feeding in G pushes a lead from the magazine and forces it through the point of the pencil. .Ast-he lead `isi consumed and the cross head II approaches the lower end of the sleeve B, the cam r on the cross head snaps into a notch g, in the bottom ot' the groove K (Fig. el). Then the sleeve I is pulled back, the teeth oit the cross head H being clear of the threads ot the sleeve B. As the parts approach the position of Fig. 3, the projection s strikes against the stop cl by which the projection s and consequently the groove K are displaced in the sleeve I in the direction toward the point oit the pencil. By this operation the cam r is torced out oit the notch q and the crosshcad, now located in an unthreaded and suilicently large portion ot the sleeve B, will occupy such a position as to allow it only by screwing to be brought through the lthreaded portion of the sleeve B. By rotating the sleeve B in the outer sleeve or shellrotating the magazine automatically tor instance by a spring arrangement-a 'fresh lead is brought from the magazine in tront oi" the feeding pin G. On again screwing the crosshead I-I forward the fresh lead is brought toward the point ot the pencil.

Further embodiments olf the invention may be suggested. For the stop (l a stop constructed in any other way may be substituted.l it may be placed in diilerent positions in the sleeve B and may be mounted in the other ways, tor instance, directly in the sleeve B without the aid of any special member. The portion of the sleeve I, which is given a large diameter, may be placed at any other place than at the. end of the sleeve. The projection c may have different constructions according to the construction given to the member K. This member need not have the shape ot a groove. Such variations should be considered as Idifferent embodiments of the present invention.

Claims:

l. A mechanical pencil comprising a longitudinal, internally threaded sleeve, and a lead-feeding mechanism slidable and rotatable therein and including a lead-pusher and a toothed element adapted to `engage the threads of said sleeve and having a cam opposite its teeth, said mechanism also including' a slidably mounted grooved member engaging said cam to press the teeth into engagement with said threads and having a notch to receive the cam in order to `allow the toothed element te be disengaged from said threads, and a projection extending transversely through and beyond the wall of the Yfeeding mechanism, said sleeve having a stop adapted to be engaged by said projection, so that, when the toothed element is disengaged from the threads and its cam projects into the notch ot the grooved member, relative sliding et the sleeve and the 'feeding mechanism brings the projection into engagement with the stop and slides the grooved member with respect to the feeding mechanism,

whereby the cam is `forced out ot the notch and the toothed element is projected into the path ot the threads.

2. A mechanical pencil. as claimed in claim l, in which the wall ot the 'feeding mechanism above and below the projection on the grooved member is spaced inwardly away from the threads ot the sleeve, and the stop on the sleeve comprises a removable collar having an inwardly extending` flange against which said wall is slidably and rotatably supported.

8. In a mechanical pencil ot the kind in which the 'feeding ot a lead is accomplished by means of a pusher movable by means ot propelling device said pencil comprising a control-member, adapted in the feeding ot the lead, to maintain cooperative engagement between said pusher and said device, and means for releasing the engagement between said pusher and said device; the arrangement of means comprising a projection on the said control-member, and a stop in relation to which said projection is movable, disposed in the pencil in the path ot said projection tor actuating said controlmember for the purpose ot reinstating said engagement.

4. In a mechanical pencil ot `the kind in which the feeding of a lead is accomplished by means ot a pusher movable by means of a propelling device, said pencil comprising a control-member movable in a casing, said control-member being adapted, in the teeding of the lead, to maintain cooperative engagement between said pusher and said device, said casing being movable in the pencil, and means for releasing the engagement between said pusher and said device at the foremost position of the pusher, adjacent to the point of the pencil, so that the pusher can be freely moved backwards; the arrangement ot' means comprising a projection on said controhmember extending through a slot formed in the wall ot said casing and a stop disposed in the pencil in the path oli' the said projection and adapted to be engaged by said projection when the casing and the pusher are moved to their hindmost position.

5. In a mechanical pencil comprising a leadefeeding mechanism normally in engage` ment with a propelling device, said pencil comprising a control-member slidably mounted in the lead-feeding mechanism and adapt ed, in the feeding ot the lead to maintain cooperative engagement between said feeding mechanism and said propelling device, and means :tor releasing the engagement between said propelling device and said feeding mechanism, the arrangement oi means tor imparting to said control-member a sliding motion, for the purpose of reinstating said engagement.

6. A mechanical pencil comprising a lonlll) gitndinal internally threaded sleeve, a leadfeeding mechanism slidable and rotatable therein and including a lead-pusher and a toothed element adapted to engage the threads ot' said sleeve and having a cam opposite its teeth, said mechanism including a slid-ably mounted control-member adapted, in the feeding of the lead, to maintain cooperative engagement between said toothed element and said threaded sleeve, said control-member having a notch to receive the cam to allow the toothed element to be disengaged from said threads, and a projection on said control member extending transversely beyond the feeding mechanism, said sleeve having a stop adapted to be engaged by said projection, so that, when the toothed element is disengaged from the threads and its cam projects into the notch the controldnember,

relative sliding of the sleeve and the feeding mechanism brings the projection into engagement with the stop and slides the control-member with respect to the feeding mechanism whereby the cam is forced out of the notch and the toothed element is projected into the path of the threads.

7. A mechanical pencil as claimed in claim 6, in which the wall of the feeding mechanism above and below the projection on the controlanember is spaced inwardly away from the threads of the sleeve, and the stop on the sleeve comprises a removable collar having an inwardly extending flange against which said wall is slidably and rotatably supported.

In testimony whereof I aix my signature.

EINAR GUSTAF EVALD HOGNER.

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