US1578565A

US1578565A - Mechanical pencil

Info

Publication number: US1578565A
Application number: US676876A
Authority: US
Inventors: John C Wahl
Original assignee: Wahl Co
Current assignee: Wahl Co
Priority date: 1923-11-26
Filing date: 1923-11-26
Publication date: 1926-03-30
Anticipated expiration: 1943-03-30
Also published as: DE432960C; GB225512A

Description

March30 1926. v 1,578,565 Y J. c. WAHI. l

MECHANICAL PENCIL Filed Nov. 26'-, 1923 A sectional view of my invention.

Patented Mar. 30, 1926.

UNITED STATES' Vliasses- PATENI' OFFICE.

JOHN c. WAHL, ory cHIcAeo, ILLINOIS, AssIGNoR 'ro THE WAHL coIfIrAmz', or

cHIcAeo, ILLINOIS, A coaronATroN or DELAWARE.

MECHANICAL PENCIL.

Applicata@ mea november ze, 192s. serial No. 676,876.

10 cils and more particularly to the construction of the lead pencil.

The invention herein presented consists reserve magazine of the of improved details of construction on the l5 lead reserve magazine features of the me- .chanical pencil disclosed and claimed in my co-pending application Serial No. 664,896,

' filed September 26, 1923.

In the drawings Fig. 1 is a longitudinal Fig. 2. is a view partially in longitudinal section and partially fragmentary.

Fig. 3. is a cross sectional view onther line 3-3 of Fig. 1.

Fig. 4. is a perspective view, partly broken away, of a portion of a mechanical pencil in which my invention is embodied, and

Fig. 5. is a detail perspective view of the part of the quick release mechanism which is described in my co-pending application above mentioned. Y

The numeral 1 indicates a metal barrel swedged at one end to form a small aperture. Mounted on the interior of the barrel 1 is a threaded sleeve 2, the threads extending part of its length only, as is illustrated in Fig. 1.

The lower and unthreaded end is swedged to form a lead guide 3. The lower part of the swedged end is threaded as at 4 to engage in the threads on the interior of a steel tip 5. The upper portion of the sleeve l2 is flared outwardly as at 6, and the shoulders formed by this flare are adapted to seat on a bea'd on the interior of the barrel 1, thus prohibiting the Sleeve 2 from being pulled into the barrel 1 when the tip 5 is screwed on to the lower end thereof. It will be seen that the screwing of the tip 5 to the threaded end of the lead guide 3 locks the sleeve 2, the lead guide 3 and the" tip 5 in position on the pencil. The steel 'tip 5 is similar to that shown in Patent l Number 1,151,016 to Charles R. Keeran.

A lead feeding mechanism such as is disclosed in Fig. 4 is provided, vthe lower half thereof, from the shoulder 7 to the swed ed end 8, that is the actual lead feeding mec anism, is similar to that disclosed in my copending application, Serial No. 664,896, and

comprises in general a threaded crosshead 20, carrylng the lead ejector rod 21, thel threads 22 on one side of the crosshead engaging with threads 23 formed in the tubev 2. The crosshead 20 has longitudinal sliding movement in slot 25, formed in the .tubular portion 24. Upon rotation of tube 24 with vrelation to the outer casing and threaded tube 2, the crosshead due to its engagement with the threads above referred to, will be caused to move longitudinally in lslot 23, advancing the lead ejecting rod 21 upon rotation in one direction and retracting the same on rotation in the opposite n l direction. Further' details of this construction will be readily understood upon reference to my co-pending application referred to above. The upper portion, from' the numeral 7 to the numeral 9, is of larger di-v ameter than the lower portion from 7 to 8.

This upper portion is the reserve lead mag-l lar in shape with the apex somewhat rounded is cut in the side of the lead magazine,`

this slot being of a` Tlength less than the length of the leads which 'are provided for pencils of this type. The upper portion of the lead magazine is threaded as at 11v to accommodate an eraser bearing cap 12.

To' insert leads intoy the lead chamber,

the cap 12 A is unscrewed'about fourv turns,

and inasmuch as there is a disk 14 directly below the eraserwhich prevents the extra leads from falling out of the top of the magazine the chamber in the reserve lead magazine is lengthened,leads are inserted through the slot 10 and the cap 12 is screwed back to its original position.

Inasmuch as the bottom and wider end 'claim as new and desire to of the "slot 10 -is positioned a distanceof.

alignment with the aperture 10, whereupon4 the leads are prevented' from falling out of the chamber through the aperture 10 until the cap 12 is unscrewed a distance suilicient to permit an extra lead todrop out of the aperture 10 as is illustrated in Fig. 4.

It will be noted that because of its triangular shape. the slot'10 will permit but one lead tovproject at one time. This is ,due to the narrow rounded apex of the slot and further that the 'wider portions of the slot formedby the `base of the triangular portion of the slotwill permit a more facile 4projection ofl the upper end of the lead through said slot. 'lhis latter triangular shaped-slotis disclosed and claimed in my before mentioned application;

Having described my invention, what l securexby Letters Patent is: p

l. ln a pencil a casing., a lead magazine slidable into and out oil said casing, an opening in the side of the yleadmagaziney of less length than the length of a lead.` andmovable means associated with said leadmagazine which in one 'position will hold both' ends of the leads in the magazine out of registry withthe slot and in another position will permit one end of a lead to project out of said slot.

2. ln a pencil a casing, a lead magazine in said casing and having an opening in the side thereof, said lead magazine being mov ably mounted in the casing so as to expose theopeni-ng in one position and close it in another, the lead magazine being oi a length approximately equal to the 'length of a. lead, and a closure forthe end ofthe magazine, said closure being longitudinally movable to hold the ends of the leads beyond the' ends of the opening in one' position and to permit 4one end of a lead to move out of the opening in another position., Y

3. In a. mechanical pencil, the combina- I tion of a casing, a lead propelling mechanism houseable therein and having means cooperating with said casing for propelling the lead, said mechanism being constructed and arranged to have at least a' portion thereof projectableoutside of said casing, saidv pro3ectable portion being formed with a lead holding chamber of a length substantially eq'ual to the length of a lead, and hav-` ing a slot in the wall thereof of less length than a lead whereby-to prevent the projection of a lead through said slot, and means for increasing the length of said chamber for permitting the end of a lead to project through said slot.

e. ln a mechanical pencil, the combination of a casing, lead propelling mechan nismhous'ed therein and having means cooperating with said casing` for propelling the lead, said-mechanism fbeing'constructed and arranged to have at least a portion thereof projectable outside of said casing, said projectable portion being formed hollow and with an open end and of a length substantially equal to the length of a lead, and provided with a slot in its wall of less length than a lead, a cap adapted to close the end,y of said projectable portions andv means for shifting said cap on said projectable portion to increase the length of. the chamber therein to permit a lead t'o project. p through said slot.

. 5. ln a mechanical pencil,` the c111`bi11;, 4

tion of a casing, a lead propelling me'chanism housed therein and having means cooperating with said casing for propelling the lead, said mechanism being constructed and arranged to have at least a portion thereof projectable outside of said casing,l

said p-rojectable portion being formed holf low and with an open end and of a length substantially equal to the length of a. lead and provided with a slot in its wall of less length than a lead, a cap adapted to t on the open end of said projectable portion having a disc therein spacedlrom the end to close said open ended tube and to form an eraser seat, anferaser in said seat, and4 means permitting the adjustment of said cap on said projectable portion to increase the length or said chanrber to permit a lead .l im

to project through said slot.

6. ln a pencil a casing, a lead magazine longitudinally movable in said casing and having a slot in its' side wall of less length than the length of a lead, and a longitudinally movable closure for said magazine to expose the slot, and a closure for said i magazine movable longitudinally thereof to move the leads endwise into and out of position for withdrawal through the slot.

8. In a pencil, av casing, a lead magazine having a slot in its wall and withdrawable from the casing to a position to expose the slot, the length of the magazine being aplproximately equal to the length oa lead and the length of the slot being less than the length of a lead, and means for increasing the length oilv the magazine chamber for permitting the end oi' a lead to project through `the slot. y

9. ln a pencil, a casing, a lead magazine having a slot in its wall and movable in the casing to a position to expose the slot, andmeans flor varying the length of the magazine chamber to selectively permit and iat through the slot when the slot is in exposed a movable .cap on the end of the magazine position. to vary the `len h of the chamber for the 10. In a lead magazine for mechanical purpose set fort 10 pencils, a lead holding chamber of a length In witnessvwhereof, I have hereunto sub- 5 approximately equal to the length of a lead, scribed my name.

the side wall of the chamber having a slot v of less lengt-h than the length of a lead, and JOHN C. WAHL.