Abstract: A mechanical pencil is including a tubular shaft, a chuck unit movably arranged in the shaft, a front rotary element adapted to be moved rearward as the unit is moved rearward, a rear rotary element adapted to be moved rearward as the front rotary element is moved rearward, a conversion means for causing the rear rotary element to rotate in a normal rotational direction as the rear rotary element is moved rearward and allowing the rear rotary element to rotate in a reverse rotational direction as the rear rotary element is moved forward, a normal directional rotation transmitting means for allowing the front rotary element to be rotated in the normal rotational direction and the rear rotary element to be idly rotated, and a reverse directional rotation restricting mechanism allowing the normal directional rotation of the front rotary element but preventing the reverse directional rotation of the front rotary element.

Abstract: A mechanical pencil having a tubular body extending along a longitudinal axis between a rear-end which has a first opening and a front-end which has a second opening, a lead that can move out through the second opening and a mechanism for advancing the lead arranged within the tubular body. The advancing mechanism includes a pushing device adapted to slide parallel to the longitudinal axis, a chuck located at the front end side of the tubular body and which could be tightened onto the lead in a tightened position; a reservoir which extends along the longitudinal axis for housing at least one lead, wherein the tubular body has an annular wall for pushing device retention at the rear end thereof.

Abstract: A pencil with buffering effect for prevent a pencil lead from breaking comprises a head tube; a stepped element installed within the head tube and resisting against a front end of the spring; a spring; the spring having two sections, a front section and a rear section; the front section being denser than the rear section; a positioning tube; a plug resisting against the positioning tube; an inner tube enclosed by the spring and a rear end of the spring being in contact with the positioning tube; the inner tube passing through the positioning tube; a distal end of the inner tube being connected to a plug; a sleeve enclosing the inner tube and the positioning tube; the sleeve being connected to the head tube; and a pencil lead received within the stepped element.

Abstract: The lead propelling device of the invention is a lead propelling device having a structure for gripping and releasing the lead by a lead gripping mechanism by knocking operation, not transmitting the knocking force to the lead gripping mechanism in knock forward operation, wherein a stopper not allowing the lead to pass by its own weight interlocks with the knock operation, the lead abuts against the stopper rear end upon release of the lead, the lead is inserted into the stopper after gripping the lead in knock backward operation, thereby propelling the lead, and therefore after the knock operation part advances by a predetermined distance, the lead gripping mechanism clears gripping of the lead, and when the lead gripping mechanism grips the lead in the backward stroke of the knock operation part, the knock operation part is set to be movable backward further by a predetermined distance.

Abstract: A double-chuck mechanical pencil comprises a barrel, a barrel cap detachably attached to a front end of the barrel, a lead tank inserted in the barrel, a feed chuck for feeding leads, combined with the lead tank, a sleeve bolster disposed on the front side of the feed chuck, and a holding chuck combined with the sleeve bolster. A holding chuck unit including the holding chuck and the sleeve bolster, and a feed chuck unit including the feed chuck and a sleeve can come into contact with each other in the barrel cap.

Abstract: A mechanical pencil has a tubular member having a front end and a rear end. A slide member is disposed at the front end of the tubular member for axial sliding movement therein. The slide member has a lead passageway for receiving a pencil lead. A lead advancement mechanism undergoes axial movement within the tubular member and has a chuck body for undergoing advancing movement to advance the pencil lead through the lead passageway of the slide member and toward the front end of the tubular member and for undergoing retracting movement toward the rear end of the tubular member. The slide member is disposed in frictional engagement with the chuck body for retracting movement therewith.

Abstract: A mechanical pencil, includes an external cylinder, a lead delivery mechanism disposed in the external cylinder, the lead delivery mechanism having a lead-fastening chuck which fastens a lead and moves back and forth in the external cylinder to deliver the lead toward a front end of the external cylinder, a lead holder disposed before the lead delivery mechanism in the external cylinder to gently hold a lead, and a guide member arranged between the lead-fastening chuck and the lead holder in the external cylinder and always urged backwardly toward the lead-fastening chuck to protect a lead portion between the lead-fastening chuck and a lead holding portion of the lead holder.

Abstract: A double-chuck mechanical pencil having a front lead chuck for holding a lead and a back lead chuck for advancing a lead which is composed of a barrel, a lead tank connected to the back lead chuck, an adapter attached to the back of the lead tank which is restrained from rotation relative to the barrel and axially movable, and a rotary eraser projecting mechanism including a support member or an eraser support structure including a support member that is restrained from rotation relative to the adapter and detachable from the back portion of the adapter.

Abstract: A double-chuck mechanical pencil having a front lead chuck for holding a lead and a back lead chuck for advancing a lead which is composed of a barrel, a lead tank connected to the back lead chuck, an adapter attached to the back of the lead tank which is restrained from rotation relative to the barrel and axially movable, and a rotary eraser projecting mechanism including a support member or an eraser support structure including a support member that is restrained from rotation relative to the adapter and detachable from the back portion of the adapter.

Abstract: A double-chuck mechanical pencil has an outer tube, a tip fitting provided in the front of the outer tube, a tip chuck located at the tip of the tip fitting for holding a writing substance (e.g., a lead) and urged rearward in the axial directed, and a delivery chuck for delivering the lead. At least one of the tip chuck and the delivery chuck is formed of a synthetic resin material including polyoxymethylene.

Abstract: A double-chuck mechanical pencil includes a barrel having an open front end part, an inner tube inserted in the barrel, a front chuck having a first chucking head and supported on a front end part of the inner tube with a front end part of the first chucking head projected outside through the open front end part of the barrel, a feed chuck having a second chucking head and inserted in the inner tube, a chuck ring put on the second chucking head of the feed chuck, and an axially movable tank serving as both a member to contain spare leads and a member to push the feed chuck.

Abstract: A double-chuck mechanical pencil has an outer tube, a tip fitting provided in the front of the outer tube, a tip chuck located at the tip of the tip fitting for holding a writing substance (e.g., a lead) and urged rearward in the axial directed, and a delivery chuck for delivering the lead. At least one of the tip chuck and the delivery chuck is formed of a synthetic resin material including polyoxymethylene.

Abstract: A press type mechanical pencil includes an upper barrel, a press device, a refill tube, an abutting rod, a clamp/release device and a lower barrel. An insert post of the clamp/release device has a top portion connected to the abutting rod which is centrally provided with a refill hole for passage of refills. A refill tube is disposed between the abutting rod and the press device. A storage tube has a tube chamber for receiving a plurality of refills, and an open end connected to a tube plug. The tube plug is adapted to guide the refills and for connection with the abutting rod. A neck hole therein provides passage for only one refill through the refill hole into the clamp/release device.

Abstract: A side-knock type mechanical pencil comprising a barrel having an opening in a side wall, a chuck mechanism housed in the forepart of the barrel, a slider moved back and forth within the barrel to open and close the chuck mechanism, a knock lever which is inserted into the opening with an upper front end pivotally mounted with respect to the barrel, a lower front end thereof being placed in contact with the slider, and a resilient member for holding the knock lever in an initial position.

Abstract: A double chuck type mechanical pencil comprising a lead tank 4 slidably provided within an axial tube 1, a rear chuck 5 for drawing out a lead fixedly mounted on the front end of the lead tank 4, a chuck ring 6 loosely fitted in the rear chuck 5, a rear resilient component 8 for biasing rearward the tank 4 and the rear chuck 5, a front chuck 11 for holding a lead connected to the rear chuck 5 through a connecting means 7, 9, a front resilient 10 component for biasing rearward the front chuck 11 disposed within a tip member 2 provided in the front of the axial tube 1, and a loosely fitted tube 12 at least having a stopper portion 12b at the rear end provided in an opening portion of the tip member 2, and thereby preventing abrasion around an opening at the extreme end of the tip member 2 caused by impingement of the front chuck 11, and not giving rise to twisting of the lead caused by rotation of the chucks 5, 11.

Abstract: A slider type mechanical pencil has an outer tubular member having a front end and a rear end. An inner tubular member is disposed in the outer tubular member for axial movement therein and has a lead advancement mechanism for axial movement within the outer tubular member to advance a pencil lead toward the front end of the outer tubular member. A slider has a first end portion projecting from the rear end of the outer tubular member and a second end portion. The slider extends into the outer tubular member so that the first end portion of the slider can be pressed in the axial direction relative to the outer tubular member to move the inner tubular member and the lead advancement mechanism in the axial direction toward the front end of the outer tubular member. A pusher member extends into the outer tubular member for axial movement therein and has a first end portion projecting from the rear end of the outer tubular member and a second end portion.

Abstract: In a mechanical pencil capable of double-chuck and side-knock type lead control functions, a slide member is axially slidably fitted in a barrel fixedly provided at its front end with a head cap, a knocking member is pivotally supported in an opening formed in the barrel to operate the slide member so that a lead projecting back chuck on which a chuck ring is loosely fitted is advanced against the resilience of a chuck spring biasing the lead projecting back chuck backward to project a lead, a sleeve is fitted on the back chuck, an inner barrel is fitted on the sleeve, and a lead holding front chuck is placed in the head cap and is biased backward by a spring.

Abstract: A double-chuck mechanical pencil has an outer tube, a tip fitting provided in the front of the outer tube, a tip chuck located at the tip of the tip fitting for holding a writing substance (e.g., a lead) and urged rearward in the axial directed, and a delivery chuck for delivering the lead. At least one of the tip chuck and the delivery chuck is formed of a synthetic resin material including polyoxymethylene.

Abstract: A writing instrument comprises a barrel provided with a tip element at the front thereof, a writing mechanism provided longitudinally movably within the barrel, a resilient element for biasing the writing mechanism backward, a knock member detachably mounted on the rear end of the writing mechanism, and a rattle-preventive means provided between a knock member and the barrel. The rattle of the knock member can be completely eliminated despite the presence of a clearance between parts such as between the knock member and the barrel or the tail crown.

Abstract: In a double-chuck mechanical pencil provided with an eraser, the torsional breakage of a lead gripped by a front lead chuck and a back lead chuck due to the turning of a lead tank caused when an eraser is used is prevented, and inconvenience to a lead supplying operation caused by the abrasion of the eraser is eliminated.

Abstract: A double-chuck mechanical pencil comprises: a barrel; a barrel cap attached to the barrel; a lead tank axially slidably inserted in the barrel; a back chuck fixedly joined to the front end of the lead tank; a chuck ring loosely fitted on the chucking head of the back chuck; a tubular member disposed so as to surround the front portion of the lead tank; a back elastic member placed in the tubular member so as to bias the lead tank backward; a coupling member combined with the tubular member, and provided in its inner circumference with stopping portions with which the tubular member and the chuck ring come into contact, respectively; a front chuck fixedly joined to the front portion of the coupling member; and a front elastic member interposed between the barrel cap and the coupling member so as to bias the coupling member backward. A rotation prohibitor permits the axial movement of the coupling member and prohibits the rotation of the same relative to the tubular member.

Abstract: A writing tool in which flexible pieces 24a projecting diametrically outward are provided in sleeve 24 of writing shaft body 11, while holding holes 10a are provided in outer case 10. By inserting parts of flexible pieces 24a into holding holes 10a, respectively, writing shaft body 11 is held within outer case 10 by engaging outer case 10. Holding holes 10a are through holes formed in the side of outer case 10, wherein a distance r1 between the outer surface of outer case 10 near front edges F of holding holes 10a and the central axis of outer case 10 is approximately equal to or smaller than a distance r2 between the inner surface of outer case 10 near rear edges R of holding holes 10a and the central axis of outer case 10.

Abstract: A push-type writing instrument, particularly a pencil, includes a retaining collar downwardly protruded from a pair of radially opposed fingers provided on a tapered forward portion of an outer body in which a lead is retained, having two arm members with each arm member connected between the retaining collar and each finger for suspending the retainer collar under the pair of opposed fingers to prevent loss of resilience of the two fingers due to fatigue failure when frictionally holding the lead between the two fingers for a long time service.

Abstract: A mechanical lead pencil having the capability of feeding different diameter leads. A first collet is disposed in the pencil barrel for feeding the lead and a second collet is located at the barrel open end for retaining the lead during use of the pencil. An elastomeric disc is provided between the two collets, having a variable diameter opening at the center thereof for frictionally engaging the lead and preventing its release when the two collets are in the open position.

Abstract: A rotary knock type mechanical pencil in which the forward and rearward outer cylindrical are relatively rotated, a cam movement converting mechanism stored in the forward outer cylinder converts the rotary movement into an axial advancing or retracting movement, the lead feeding mechanism may feed the lead of desired length from the extremity end of the mechanical pencil under a knocking operation in the shaft comprising: a cam cylinder integrally rotating with the rearward outer cylinder; that includes two cam surfaces and an engaging part which allows retraction of a lead guide pipe a rotary cam mechanism for converting the rotary movement of the cam cylinder into a reciprocating advancing or retracting movement while slidably contacting with the cam surface formed at the extremity end surface of the cam cylinder; a lead feeding mechanism including an advancing or retracting mechanism such as a cassette adapter for advancing or retracting the lead chuck attached to the extremity end under a reciprocating m

Abstract: A mechanical pencil which employs the concept of inverting the configuration of a conventional mechanical pencil by designating the depressible end as the writing end and the stationary end as the eraser and thereby providing the convenience of advancing the lead as required without interrupting the writing process and requiring slightly more than the effort of dotting the letter "i" or adding a period at the end of a sentence.

Abstract: A cosmetic pencil capable of advancing a soft cosmetic mass a short predetermined distance. The pencil has a lower barrel which includes a gripping disk stop. A hollow sheath member is held in the lower barrel and has an outwardly facing cam surface. A holding tube is rotatably inserted into the lower barrel and surrounds the sheath member. The holding tube also has a cam surface, and a spring member and gripping disk surround a push rod which extends into the center portion of the sheath which holds the soft cosmetic mass. Turning the holding tube forces the sheath inwardly, and the gripping disk holds the push rod steady with respect to the lower barrel and, thus, a small amount of cosmetic mass is moved upwardly by the movement of the sheath with respect to the push rod.

Abstract: A mechanical pencil having an automatic lead extending mechanism which has a radially displaceable member disposed on an entire circumference of the pencil body. The lead protrudes from a tip end of the pencil body when the radially displaceable member is radially displaced.

Abstract: A mechanical pencil in which a lead guide pipe may protect a lead in a range from a lead chuck to the tip member or an extremity end of the slider by the tip member or the slider or the projection bar as well as the lead guide pipe so as to protect the lead and to prevent a breakage of the lead and a clogging of broken lead.

Abstract: A rotary knock type mechanical pencil in which the forward and rearward outer cylinders are relatively rotated, a cam movement converting mechanism stored in the forward outer cylinder converts the rotary movement into an axial advancing or retracting movement, the lead feeding mechanism may feed the lead of desired length from the extremity end of the mechanical pencil under a knocking operation in the shaft comprising: a cam cylinder integrally rotating with the rearward outer cylinder that includes two cam surfaces and an engaging part which allows retraction of a lead guide pipe; a rotary cam mechanism for converting the rotary movement of the cam cylinder into a reciprocating advancing or retracting movement while slidably contacting with the cam surface formed at the extremity end surface of the cam cylinder; a lead feeding mechanism including an advancing or retracting mechanism such as a cassette adapter for advancing or retracting the lead chuck attached to the extremity end under a reciprocating mov

Abstract: A lead chuck of a mechanical pencil to be assembled into a lead feeding mechanism of a rear end knock type, an automatic lead feeding type and an extremity end knock type mechanical pencil in which it is arranged within the sleeve through a resilient member in such a way as it may be advanced or retracted. A lead holding part is formed at the extremity end portions of the divided surfaces of the chuck members which are fully divided into two sections along an axial plane. The lead holding part is formed with several teeth for use in holding the lead under four-point or six-point contacted condition within axially formed grooves made at the central portions of the divided surfaces. The teeth are projected in several rows and formed at the raised surfaces of the grooves.

Abstract: A mechanical pencil has a body with a lead storage chamber defined therein for housing spare lengths of lead, and a tubular lead guide receiving a length of lead and coaxially mounted in the body so as to partly protrude outwardly from its writing end. During writing or marking, the lead guide gradually retracts into the body against the force of a return spring with the wear of the lead received therein and, when the pencil is moved off the writing surface, it is held in place by a locking mechanism until a preselected wear point is reached, then it is sprung back to its normal position. Disposed intermediate the lead storage chamber and the lead guide, a chuck coacts with an internally tapered socket for gripping the lead against displacement away from the writing end of the body.

Abstract: An automatic lead advance for a mechanical pencil having a tubular casing, a conical member joined to the front end portion of the tubular casing, a ring fixed to the inner surface of the conical member, an annular pivotable member provided at the front side of the ring, a lead guide tube having a lead retainer, urged backward by a spring, adapted to the slidable in the axial direction, and positioned so that the portion of the front end surface of the pivotable member which is away from the fulcrum of pivotal movement thereof contacts the rear end portion of the lead guide tube, a ball chuck mechanism urged forward by a knock spring and adapted to be movable between the rear end surface of the ring and an end surface of a stepped portion formed on the inner surface of the tubular casing, and a stopper provided at the front end of an outer tube of the ball chuck mechanism and contacting at the front end surface thereof the portion of the rear end surface of the pivotable member which is close to the fulcrum o

Abstract: Mechanical pencil in which a chuck assembly for gripping a lead is formed with plural chuck elements mutually combined with each other. The chuck assembly has an internal longitudinal hole to insert a lead through and a lead gripping portion to grip the lead, while a lead guide tube is movably inserted within the lead inserting hole. The lead guide tube pushes on acting portions of the chuck to open the gripping portions of the chuck elements in the direction of parting them from each other when the lead guide tube is advanced, and the lead gripping portion opens to release the lead. The chuck is designed to enable releasing and gripping the lead securely so that it can be suitably used as a chuck mechanism for extending the lead automatically.

Abstract: A push-button type mechanical pencil consisting of a barrel which is composed of a clip-carrying upper barrel member and a metal tip-carrying lower barrel member, which barrel members are engaged with each other at a substantially intermediate portion of the barrel and joined to each other by a rotary unit structure so that the barrel members can be turned with respect to each other, a movable cylinder provided in the unit structure and adapted to be moved forward and backward in the axial direction owing to a screw pair, and a lead-extruding structure provided in the barrel and capable of projecting a lead in a stepped member by a very small length at a time by pressing the upper end of a push-down tube, which lead-extruding structure includes a push-button member projecting from the rear end of the barrel, a protective pipe provided in a bore at the free end of a metal tip provided at the lower portion of the lead-extending structure, and an outer tube fixed to the movable cylinder in the unit structure to

Abstract: A mechanical pencil wherein a slider 11 in contact with a lead and an outer tube 1 with different frictional resistances other than a lead delivery mechanism for effecting lead-feed by general knocking operation are provided within the outer tube 1 or a fore means 2, whereby the end of a consumed lead 19 is pressed against or released from a surface of paper or the like to thereby project the lead 19 from a lead guide 12 by an amount corresponding to backward movement of the slider 11. The lead-feeding may be easily accomplished merely by pressing operation without changing the grip of the outer tube 1.

Abstract: A mechanical pencil for automatic drawing machines is disclosed which feeds lead segments to the writing surface as the pencil is alternately pressed against and lifted from the writing surface. The pencil includes a housing having a reserve lead containment chamber and a main internal cavity. A collet split into two portions is mounted within the internal cavity beneath an opening between the main cavity and the containment chamber and has outer cone-shaped camming surfaces and first and second axially spaced, cylindrical inner clamping surfaces. A friction tube with an inner bore adapted to frictionally engage a lead segment is mounted beneath the collet and holds a lead segment to support it against the writing surface.

Abstract: A blade is removably supported on one end of a shank which is axially movably disposed in a tubular holder. The shank has an axially extending slit terminating at the end thereof for supporting the blade therein and a tapered portion having an outside diameter decreasing gradually from the end of the shank. The blade is movable from one of its retracted, cutting and replacement positions to another with the movement of the shank. A sleeve is fitted about the shank adjacent to the end thereof and has one end facing the tapered portion thereof. A coiled spring is provided on the shank for urging one end of the sleeve into contact with the tapered portion of the shank. The sleeve is axially movable with the movement of the shank. The holder is provided on its inner surface adjacent to the sleeve for preventing the movement of the sleeve upon movement of the blade to its replacement position.

Abstract: A multiple, metered dosage device having an elongated body provided adjacent one end with a compartment or an ampule to contain material to be dispensed, a piston movable against the material to discharge it from a nozzle, a rod-like plunger movable by a pressure device against the piston to discharge material and a combination stop and release unit movable intermediately of the ends of the body between depressed and elevated positions respectively to engage a pair of racks of teeth on the plunger and including first and second teeth respectively engageable with the racks of teeth sequentially to permit the pressure device to advance the plunger and piston in similar metered, precise or predetermined increments of feeding in discharge direction and then stop the feeding movement and maintain such stopped position until the stop and release unit next is depressed.

Abstract: A mechanical pencil having a chuck mechanism which permits the lead to advance but prevents the lead from retracting, a first slider, a second slider which is retractable progressively as a writing pressure is applied, a first engagement device for holding the second slider at its retracted position and a second engagement device for holding the first slider at its retracted position. The progressively retracted second slider is released to advance to the forward original position by applying a further writing pressure to cause a retraction of the first slider. Then, the second slider is advanced forwardly together with the lead so that the lead is advanced to a writing position.

Abstract: A lead propelling mechanism for a mechanical pencil includes a lead chuck, a ring fitted loosely about the chuck for tightening its head, a sleeve having a front end contacting the ring, and an elastic member having a front end bearing on the front end of the sleeve and a rear end held by a shoulder formed on the outer surface of the chuck adjacent to its rear end. The mechanism is very easy to assemble and join to a lead holding tube in the pencil. The rear end of the elastic member bears against an adjacent end of the tube to urge the ring to tighten the head of the chuck, when the chuck is inserted into the tube.

Abstract: An automatic pencil with a lead-sharpening device, has a pencil lead of a diameter of 2 mm inserted into the pipe sleeve of the pencil case in which a lead-sharpening knife holder is attached. Whenever the lead becomes dull, the user presses and turns the cap on the top of the pencil and then sharpens the lead by the knife holder to make the lead ready for continued use, and the user can retract the lead back to the pencil case if the pencil is not used to prevent the lead from being broken or damaged.

Abstract: A mechanical pencil having a cylindrical barrel (1) and a sheath (2) in axial relationship is disclosed. A spiral member (4) in fixed relationship with the sheath and in axially sliding relationship with the barrel for a predetermined range engages a slider (7). The slider is in fixed relationship with a push feed type writing unit and slides axially within a predetermined range within the barrel (1) as allowed by a guide (3). First spring means is provided to urge the spiral member in a forward direction when the writing unit is positioned axially such that it is contained within the barrel (1). As the writing unit is moved from its rearmost position within the barrel (1) to a protruding position by rotation of the spiral member (4), a second spring means urges the spiral member in a rearward direction, forming a gap between the barrel (1) and the sheath (2).

Abstract: A chuck mechanism incorporated in a mechanical pencil has a plurality of chuck elements in a longitudinal confronting relation. The chuck elements have a pivotal support or fulcrum at their opposing rearward portions so that the elements are pivotable about the fulcrum. The fulcrum is formed proximal to the rear end and distal to the front end jaw portions of the chuck elements. When an axial force is applied to the chuck elements, the jaw portions of the chuck elements are opened to release lead engagement thereby. The rear portion relative to the fulcrum is a portion where an axially forward thrust added thereto is converted to a radially inward thrust to the rear portion.

Abstract: A mechanical pencil comprising a pencil barrel, a cam cylinder mounted in the pencil barrel at a front portion thereof and having a cam wall formed on an inner circumferential surface, a cylindrical slide cam engaged with the cam wall for back-and-forth movement therein, a rotatable cam disposed in front of the slide cam and having a central hole, an inner fitting and a clamp support connected together and disposed in front of the rotatable cam, a pusher for pushing the slide cam, a spring for urging the inner fitting and the clamp support to move backwardly, the inner fitting, a lead holder mounted in the inner fitting for holding a lead with a light force, a cylindrical clamp disposed behind the lead holder and movable back and forth by a slight interval, a chuck fitted in the clamp, a lead pipe connected to a rear end of the chuck and having a diameter small enough to allow passage therethrough of one lead at a time, the lead pipe extending through the rotatable cam and the slide cam, a lead casing connect

Abstract: An automatic lead advancing mechanism for a mechanical pencil has at its writing point a lead guide tube which is movable axially against a clamping member to cause radially movable components of the clamping member to clamp the lead therein during the writing position of the pencil. The lead guide tube moves axially inwardly against a force exerted by a compression spring interposed between the clamping member and a thrust member, a portion of which is engaged by the lead guide tube and another portion of which has a beveled surface engaging a correspondingly beveled surface on the clamping member. The co-acting beveled surfaces exert both axial and radial forces to the clamping member.

Abstract: A mechanical pencil includes a lead engaging collet biased rearwardly, a collet receiver tube having a tapered guide face and rolling elements mounted between the tapered guide face and the collet for inducing a clamping force against a writing lead. The pencil includes a device for advancing the collet receiver tube and the collet toward a pencil tip and then permitting the collet receiver tube alone to move rearwardly. This assures that the inner elements will step the lead an increment from the pencil tip for writing purposes.

Abstract: A mechanical pencil includes a removable tubular cover which has functions to protect a tip of the pencil and also to advance automatically the lead therein a tiny increment to project from the pencil tip when it is attached to a rear end of the pencil for writing purposes and to a front end of the pencil after writing is finished.

Abstract: A writing instrument with automatic advancement and feed of successive leads has a housing having a tip part, a lead protecting pipe having an axis and movable in an axial direction, a lead container spaced from the lead protecting pipe in the axial direction, a gripping sleeve extending between the lead container and the lead protecting pipe, a lead clamping member having a plurality of clamping arms and movable between open and closed positions in the axial direction, wherein the clamping arms of said lead clamping member are arranged to abut against the gripping sleeve under a spring action and having a clamping opening with a receiving portion, and the lead clamping member has a shaft connected with said clamping arms with a region adjacent to the latter, and a tilting member provided in the region of the shaft of the clamping member and arranged so that during movement of the lead protecting pipe to the tip part of the housing the tilting member displaces on the shaft of the clamping member, and during m

Abstract: A propelling or automatic writing implement having a lead which can be projected from the implement without pushing. An inner frame having a chuck assembly for permitting advance of the lead but preventing retraction of the lead and a lead protecting tube having a holder for holding the lead with a suitable frictional force are housed in a main body and slidable axially thereof. A mechanism is provided for retracting the frame and the tube by a reaction to which the lead is subjected when pressed against the writing surface with a force of considerable magnitude and for returning them when the lead is released from the force, while permitting the tube to move backward and forward relative to the frame in the course of the reciprocating movement. The lead can be projected by the relative movement of the tube and the frame.