US2359093A

US2359093A - Pointer for pencil lead

Info

Publication number: US2359093A
Application number: US516965A
Authority: US
Inventors: Eastman Nathaniel
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-01-04
Filing date: 1944-01-04
Publication date: 1944-09-26
Anticipated expiration: 1961-09-26

Description

P 1944- N. EASTMAN 2,359,093

POINIER FOR PENCIL LEAD Filed Jan. 4, 1944' INVENTOR.

Patented Se t. 26, 1944 UNITED STATES PATENT OFF-ICE v rom'raa ron PENCIL LEAD Nathaniel Eastman, New York N. Y. Application January 4, 1944, Serial No. 518,965

. small end of the housing and this opening is of 4 Claims.

This invention relates to a pointer for pencil leadand is designed primarily for use by architects and others requiring sharp points on pencil lead in order to execute their work properly.

An object of the invention is to provide a simple, compact andinexpensive structure into which the sharpened end of a lead pencil can be inserted and brought to position where the exposed portion of the lead will be subjected to a wiping action by an abrasive material, thereby bringing the lead to a flnepoint and at the same time producing a dust which subsequently can be used for touch work.

A still further object is to provide a structure in which the abrasive material can be kept substantially free from accumulations of powdered lead so that it will constantly produce eiilcient service over a long period of time without necessitating any change.

With the foregoing and other objects in view which will appear as the description proceeds,

the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form 'of the invention has been shown.

In said drawing Figure 1 is a front elevation of the device.

Figure 2 is a t p plan view.

Figure 3 is a longitudinal section through the housing portion of the structure, the abrasive belt and other partsof the mechanism therein being shown in elevation and a portion of the standard being also shown in elevation.

Referring to the figures by characters of reference, I designates the lower portion of a substantially ovoid housing which can be formed integral with a support 2 or can be attached thereto if desired. The upper portion of the housing is formed preferably of a plastic material and has been indicated at 3. The upper edge portion of the lower section I is ofiset to provide a seat 4 extending lengthwise of the edge and this seat is adapted to be engaged by the corresponding edge of the top portion 3. This top portion is slightly oversize so that it can be flexed to snap into position on the seat and thus be held assembled frictionally with the lower section of the housing. The two sections cooperate to provide an inlet opening 5 at the suillcient size to receive a lead pencil.

Journalled within the lower section of the housing adjacent to the respective ends thereof arrow in Figure 3. Thus when a pencil having a are shafts 6 and I one which are mounted

rolls

8 and 9. An endless belt I. is mounted on the rolls and has an abrasive surface H. The axes of the two shafts 6 and I are in aplane which is inclined relative to the housing so that the upper flight thereof is extended upwardly and rearwardly away from a point adjacent to the lower portion of the opening 5 and will intersect the central, longitudinal axes of the housing.

Extending transversely of and journalled in the housing at a point between the shafts l and I and between the upper and lowerflights of the belt Ill is a shaft if having a finger lt afllxed thereto and rotatable therewith. This finger constitutes a tappet which is adapted to intermittently strike the lower flight of the belt ll at a point between the

rolls

8 and 8. For this purpose of effecting this operation, an'arm I4 is extended from shaft l2 into the path of a tripping finger it which is secured to and rotates with the shaft 6. Both the arm ll and the tripping finger I! are located beyond the sides of belt ll 50 that they are free to operate without interference by the belt.

By means of a crank arm IG- or the like secured to shaft 6 and located outside of the housing, the said shaft can be rotated by the user so as to cause the belt to travel in the direction indicated by the portion of its lead exposed, is inserted through opening 5 into the housing, said exposed portion of the lead can be caused to bear upon the abrasive upper surface of the top flight of the belt so that as the belt moves relative thereto, it will exert a wiping action upon the lead. By slowly rotating the pencil during this action, the lead can be brought to an extremely sharp point. The pulverized lead which i removed in this way is collected in the lower section I of the housing and, as before stated, can be subsequently used for touch work.

As the belt is operated in the manner described, the tripping finger l5 intermittently engages and lifts the arm 4 so as to raise the ta-DDet I; out of contact with the lower portion of the belt l0. Thereafter these parts are released and will fall by gravity back to their normal positions so that the tappet thus will strike the belt and dislodge any fine particles of lead which may be adhering thereto.

It will be noted that that portion of the tappet the accumulated dust.

What i claimedis:

1. The combination with a housing having a pencil inlet at one end, of an inclined endless belt movably supported in the housing and positioned for engagement by the exposed end portion of the lead of the pencil, means for operating the 'belt, and means actuated by the movement of the belt for intermittently agitating the belt.

2. The combination with a housing having an opening for the reception of a pencil having exposed lead at one end, of a belt supported in the housing and having an abrasive surface, said belt having one flight inclined relative to the axis of the pencil-receiving openin thereby to present an inclined abrasive surface to the exposed portion of the lead, means for actuating the belt, and means operated by the movement of the belt for intermittently tapping a portion of the belt..

3. A device for pointing the lead of a pencil and accumulating lead dust for touch work,

which includes a housing having an opening proportioned to receive a pencil a portion of the lead of which is exposed, an endless belt in-the housing, means for movably supporting the belt with one surface thereof inclined. relative to the inserted pencil, means for actuating the belt along and longitudinally of the exposed portion oi the lead, said belt having an abrasive surface for contacting the lead, and means for operating the belt.

4. A device for pointing the lead of a pencil and accumulating lead dust for tcuch work, which includes a housing having an opening proportioned to receive a pencil i portion of the lead 01' which is exposed, an endless belt in the housing, means for'movably supporting the belt with one surface thereof inclined relative to the inserted pencil, means for actuating the belt along I and longitudinally of the expoad portion of the lead, said belt having an abrasive surface for contacting the lead, means for operating the belt, a tappet mounted for oscillation in the housing and surrounded by the belt,- a tripping element movable with the belt-operating means, and means actuated by said element for intermittently lifting and releasing the tappet, said tappet being normally in engagement with a portion of the belt.

Y NATHANIEL nas'num.