Lead pencil

Abstract

Claims

J. B. MASON, JR. LEAD PENCIL. APPLICATION FILED APn.30. 1921. ' Patented Mar. 28, 1922. . at Nashville, I JAMES BRUCE MASON, 33., OF NASHVILLE, TENNESSEE. LEAD PENCIL. Specification 01' Letters Patent. Patented Mar. 2-8, 1922. Application filed April 80, 1921. Serial No. 465,658. To all whom it may concern: Be it known that I, JAMES Bnnon MASON, Jr., a citizen of the United States, residing in the county of Davidson and State of Tennessee, have invented certain new and useful Improvements in Lead Pencils, of which the following is a specification. This invention relates to lead pencils of the 'kind in which the lead is contained Within a casing and is propelled or fed when required through a suitable guide and through a pointed end or nozzle in such manner that the outer end of the lead shall project only a short distance beyond the tip of the nozzle so that while sufliciently exposed for writing purposes it is not apt to break. According to this invention spare leads are contained within a magazine divided into compartments surrounding the longitudinal axis'of the pencil and which is so constructed that when the tip of the pencil is removed from the barrel, the leads will be exposed and can be readily withdrawn. When a lead is worn out it may be easily discharged from the pencil and a new lead .placed in working position. The lead in use is fed forwards by a'pusher rod provided with a nut which on ages a threaded tube within the barrel and which extends through a slotted tube which may be rotated in such manner as to move the pusher rod back and forth as required. The lead is pushed through a guide tube which grips it and holds it firmly. The parts above described are at'the lower or outer end of the pencil barrel. In the upper end I provide a chamber for an erasive rubber which is held in position by a clamping device and the outer'end of which is covered by a removable cap. Other features of the invention will be hereinafter describedl- In the accompanying drawings:' I Figure 1 shows a longitudi-na central sec tion; through a pencil embodying my im-, provements. 7 Figures 2 and 3 are on an enlarged scale, Figure 2 being'a-section on line 3-3 of Figure 1.. " inder containing a chamber in which" the erasive rubber isheld and the slotted tube within which the pusher rod operates. Figure 5 is a perspective view showmg' particularly the manner in which the leads the 'line.2-.- -2 of- Figure1 and Figure 3 being a section on the rically opposite to project from the magazine pointed end of the pencil is removed. Figure 6 is a detail view in elevation of the split guide tube for the-lead within the point of the pencil. Figure 7 is a perspective view of the pusher rod and its nut. The barrel A of the pencil may be made of suitable metal or other material. It is internally threaded at its lower end to receive the threaded end I) of the pencil tip or point B. The tip is thus made detachable from the barrel. At its upper end the barrel carries a collar C which has a flange a crossing the end of the barrel. This collar is loosely connected with the barrel so that it may be turned thereon. Within this end of the barrel is located a cylinder D containing a when the tip or chamber for a stick of erasive rubber E- firmly connected with the The collar C is outer end of this cylinder at d and beyond.- ternally screw threaded as indicated at e' Where it is engaged by a nut F. The outer threaded portion of the cylinder is slotted as this point the cylinder is continued and ex shown at 6 so that when the nut F is apextends inwards to the middle portion' of the barrel and is formed with a closed end 7:. having a central opening in which'is firmly secured in any suitable .way a slotted tube H which extendsnearly toJthe outer or lower end of the barrel. This tube is of considerably less diameter than the bore of the barrel leaving a space around itserving as a leads magazlne whlch'is divided into a plu- .rality of compartments 5 by radial partitions I which may be separately applied and secured-in place ormay with the cylinder milling out recesses or compartments in" a tube of. suflicient size. .There' are slots Ip in the op'fositesides of the tube" H 'as indicatedhese slots extend from the upper end of the tube as indicated in Figure 1 to near the bottom thereof as indicated in the same figure. Theslots are closed at opposite ends and are diameteach other. Surroundformed integrally ing the slottedtube H is a cylinder K which is internally threaded. This tube is stationthe partitions I being formed on or sefastened to it and the outer ends of the. partitions engaging tightly the barrel A. The leads in the various figures are indicated at L and when a lead is in working position as indicated in Fi ure 1, it is engaged by a pusher rod M whigh is provided with a nut N which extends through the slots h of the tube H and engages the threads of the tube K. The lower'end of the tube H carries a collar n which is keyed to it as shown and it bears against the lower end of the threaded tube K. When the collar C is turned in the proper direction, the cylinder curely D is also turned and through the connections shown the slotted tube H isturned, thereby turning the nut N of the pusher rod and the pusher rod is made to advance and push the lead through the tip. By reversing the movement of the collar C, the pusher rod may be moved inwards to make room for a new lead or to permit the lead in use to be pushed back into the pencil. When a lead is worn out, the tip B may be unscrewed and withdrawn from-the barrel as indicated in Figure 5, the pencil being first reversed. When the tip is thus removed, the spare leads L will project from the magazine and one of them may be extracted, then the new lead may be inserted through the guide tube 0 and properly positioned. This guide tube 0 is slotted at 0 and has a slotted head 0' having a slot or kerf 0 to receive a tool. This screw threaded head is seated in a block P fastened in the pencil'tip and having a threaded opening 7 to receive the head 0 of the tube. It will be observed that the lower slotted end of the guide tube abuts against the inclined inner walls of the tip B so that by forcing theguide tube inwardly or outwardly it may be made to grip the lead to 34 greater or less extent. This adjustment of the guide tube is made before a lead is inserted in it, but when this adjustment is once perfected for leads of a given size no further adjustment is usually necessary. The pencil thus constructed is very simple in construction and is easily operated. It may be made at small expense. It is provided with a rubber eraser of large size which will last a long time. The leads are held individually so that they are not apt to be broken and when a new lead is desired, the operation of merely taking off the tip and securing a lead is very simple. The leads are exposed as, indicated in Figure 5' so that when their ends are uppermost they guide tending through the slots, and a threaded tube which the nut engages which surrounds the slotted tube and which is of materially less diameter than the barrel to provide a storage space for leads between it and the barreL- 2. A lead pencil, comprising a barrel, a rotatable cylinder within the upper end of the barrel, a collar rotatably mounted on the barrel and firmly attached to said cylinder, a slotted tube rotatably mounted in the barrel and attached to said cylinder, a pusher rod within said slotted tube, a nut carried thereby tube, and a threaded tube surrounding the slotted tube and engaged by the nut which is of materially less diameter than' theinterior bore of the barrel to provide a storage space for leads between it and the barrel. 3. A pencil, comprising a barrel, having a removable tip provided with means for guiding a for propelling the lead through the tip, and a magazine for spare leads having inner and outer walls surrounding the propelling means and divided into individual compartments for the lead which are'of less length than the leads and are of less length than the inner wall of the magazine. detchable tip having inclined inner walls, a extending through the slots of the 4:. A pencil, comprising a barrel having a lead when in use and with means block fixed inside the tip and having a threaded central opening, and a guide tube for the lead slotted at one end and threaded at the other, the threaded end engaging said block, and the slotted end engaging the inclined inner walls of the tip. 5. A pencil, comprising a barrel, a removable tip carried by the barrel, a guide-tube .in the tip for the lead, and a magazine for spare leads surrounding the longitudinal central axis of the barrel and which is divided into a plurality of compartments by rigid partitions which terminate within the outer ends of the leads in the magazine whereby ends of the leads project from the magazine and can be easily handled. In testimony whereof, I have hereunto) subscribed my name. JAMES BRUCE MASON, JR.

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Cited By (2)

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    US-2831459-AApril 22, 1958Scripto IncPlastic mechanical pencil feed tube
    US-5988916-ANovember 23, 1999Liu; Tsang-JennRotary type automatic pencil