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 side-knock type mechanical pencil comprises a barrel having a front end, a rear end a lead feeding mechanism disposed in the barrel for axial movement within the barrel to feed a pencil lead toward the front end of the barrel. A knock button is disposed in a side portion of the barrel so that the knock button can be pressed inward in a radial direction of the barrel to move the lead feeding mechanism axially within the barrel to thereby feed the pencil lead toward the front end of the barrel. A lead passageway is disposed in the barrel for passing therethrough the pencil lead in a direction toward the front end of the barrel. The lead passageway has a diameter at least twice as large as a diameter of the pencil lead. At least one lead receiving member is disposed in the barrel between the lead passageway and the knock button for receiving the pencil lead.

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: A writing instrument includes a barrel having a substantially cylindrical body, the cylindrical body having a finger gripping area and an outer circumferential recess portion provided around the finger gripping area, a writing medium advancing mechanism axially movably disposed within the barrel, an actuating member provided at the outer circumferential recess portion for actuating the writing medium advancing means, the actuating member being engaged with the writing medium advancing mechanism, and a finger gripping member provided around the circumferential recess portion of the cylindrical body, the finger gripping member having an opening, the actuating member being exposed externally through the opening of the finger gripping member.

Abstract: A dispenser for selectively extending and retracting a substantially stick-shaped object, comprising an outer tubular casing having an opened end, a closed end, a first chamber adjacent the opened end, and a second chamber adjacent the closed end for storing at least one spare stick-shaped object therein, the first and second chambers communicating with each other, a dispenser structure removably received in the first chamber, and a retaining mechanism for retaining the dispenser structure in the first chamber. A writing instrument of side-knock-type or side-slide-type provided with a dispenser for selectively extending and retracting a substantially stick-shaped object is also disclosed.

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 dispenser for selectively extending and retracting a substantially stick-shaped object, comprising an outer tubular casing having an opened end, a closed end, a first chamber adjacent the opened end, and a second chamber adjacent the closed end for storing at least one spare stick-shaped object therein, the first and second chambers communicating with each other, a dispenser structure removably received in the first chamber, and a retaining mechanism for retaining the dispenser structure in the first chamber. A writing instrument of side-knock-type or side-slide-type provided with a dispenser for selectively extending and retracting a substantially stick-shaped object is also disclosed.

Abstract: A side knock-type mechanical pencil comprises: a barrel, a push member supported on the side wall of the barrel, and a sliding tube longitudinally slidably inserted in the barrel so as to correspond to the push member and internally provided with a lead passage. An angular cam portion formed in a middle portion of the sliding tube has a stepped surface consisting of a high slope and a pair of low slopes. The pair of side members of the push member touch the pair of low slopes in the initial stage of the pushing operation, and the top member which joins the pair of side members the high slope in a final stage of the pushing operation. The axis of a back portion is displaced from the axis of the barrel to a side opposite the side of the push member. A funnel-shaped lead receiving portion is formed integrally with the back portion at the back end of the same.

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 side knock type mechanical pencil including a cylindrical shell having a ferrule; a slide member disposed axially movably within the cylindrical shell; a chuck disposed in front of the slide member, with a chuck ring being loosely fitted on the chuck; a chuck spring for urging the chuck backward; and a side knock mechanism provided in the cylindrical shell, the said side knock mechanism comprising a side knock member provided in the cylindrical shell and the slide member, the slide member being movable axially against the backward bias of the chuck spring and having a slant portion for abutment with the side knock member when the side knock member is depressed radially.

Abstract: A modular lead advancing mechanism receivable as an integral unit in a mechanical pencil. The mechanism includes a lead feed for feeding a pencil lead out of a pencil, and a force transmitter for transmitting a force from an operating button on the pencil to operate the lead feed.

Abstract: A mechanical pencil providing a cushioning action by the action of a sleeve disposed inside of an outer barrel. The mechanical pencil comprises an outer barrel, and a lead pipe disposed inside the outer barrel. The lead pipe has a chuck mounted in the end thereof. The pencil further comprises a chuck ring mounted on the outside of the chuck, a sleeve contacting a rear end of the chuck ring slidable relative to the outer barrel, and a spring interposed between the sleeve and the lead pipe. The sleeve has a plurality of flexible pieces that spread outwardly in a radial direction. A part of each flexible piece 24a is inserted into a stopper hole formed on an inner wall of the outer barrel. An inclined portion contacting the rear end of the stopper hole is formed on an outer surface of each of the flexible pieces.

Abstract: The present invention provides writing instruments having a mechanism for extending and retracting a writing tip and advancing a lead by rotational operation. The writing instrument is comprised of a front tubular member (1); a front inner tubular member (2) disposed within the front tubular member (1); a refill (3) inserted into the front inner tubular member (2); and a driver (10) mounted in the front tubular member (1) and the front inner tubular member (2). The driver (10 ) is allowed to rotate but not be axial displaced relative to the front tubular member (1) and the front inner tubular member (2). A rear tubular member (5) is detachably connected to the driver (10) so as not to allow rotation relative to the driver (10). A rear inner tubular member (4) is inserted in the driver (10). The rear inner tubular member (4) and the driver (10) interengage with each other by engagement between at least one axial groove (11) and corresponding projections (12).

Abstract: A side knock type mechanical pencil including a cylindrical shell having a ferrule; a slide member disposed axially movably within the cylindrical shell; a chuck disposed in front of the slide member, with a chuck ring being loosely fitted on the chuck; a chuck spring for urging the chuck backward; and a side knock mechanism provided in the cylindrical shell, the side knock mechanism comprising a side knock member provided in the cylindrical shell and the slide member, the slide member being movable axially against the backward bias of the chuck spring and having a slant portion for abutment with the side knock member when the side knock member is depressed radially.

Abstract: A slider for a mechanical pencil comprises: a slider body provided with a through bore through which a lead is passed and disposed in the tip of a barrel so as to be axially slidable in a predetermined range; a lead guide concentrically fixed to the slider body so as to let the lead slide therethrough; a sliding part concentrically connected to the outer circumference of the rear end of the slider body so as to extend forward and to be able to slide against a predetermined frictional resistance relative to the inner circumference of the tip; and a lead guiding part disposed in one end of the slider body and capable of expansion and of applying a frictional resistance smaller than that applied to the sliding part by the inner circumference of the tip to the lead.

Abstract: A side knock type mechanical pencil including a cylindrical shell having a ferrule; a slide member disposed axially movably within the cylindrical shell; a chuck disposed in front of the slide member, with a chuck ring being loosely fitted on the chuck; a chuck spring for urging the chuck backward; and a side knock mechanism provided in the cylindrical shell, the said side knock mechanism comprising a side knock member provided in the cylindrical shell and the slide member, the slide member being movable axially against the backward bias of the chuck spring and having a slant portion for abutment with the side knock member when the side knock member is depressed radially.

Abstract: A mechanical pencil has a front sleeve, a cap rotatably and detachably mounted at the rear end of the front sleeve, and a lead advancing mechanism contained in the front sleeve. Rotation of the cap actuates the lead advancing mechanism to advance a lead. The mechanical pencil prevents breakage of lead and has low manufacturing costs. A rotation cam mechanism is disposed behind the lead advancing mechanism for advancing lead. The rotation cam mechanism has a rotation cam for rotating in accordance with rotation of a cap and a cam sleeve biased to engaged the rotation cam. An inside diameter of the front end of the cam sleeve is larger than an outside diameter of the rear end of the lead advancing mechanism so that the rear end of the lead advancing mechanism is inserted into the front end of the cam sleeve with a clearance in the radial direction. An inside diameter of the rear end of the lead advancing mechanism is larger than the outside diameter of a lead to establish a clearance there also.

Abstract: An automatic-pencil cartridge includes a lead automatic compensation device which is in the front section of the cartridge and which can be triggered to automatically output the lead for further writing when the lead is worn out and unsuitable for writing; a lead holder which is in the middle section of the cartridge and which can ensure that the lead is delivered only to the exit of the cartridge; a lead-storing device, which is in the back section of the cartridge and which can be used to store lead and to open the lead holder; a cup device, used to enclose the lead automatic compensation device and the lead holder with a retainer. The lead-storing device can be arranged in one end of the cup device.

Abstract: A slider mechanism of a mechanical pencil is capable of fixing its lead guide at positions of its projection and withdrawal. The slider mechanism comprises a slider fixing the lead guide, the slider being provided with a sliding member sliding on the internal peripheral surface of a point member, a projection provided on the rear end of the external peripheral surface of the sliding member, and grooves provided on the internal peripheral surface of the point member, the grooves being engaged with the projection at positions of the lead guide's projection from and withdrawal into an aperture on the tip of the point member. The projecting position of the lead guide in a writing state and the withdrawal position in a housing state are securely maintained.

Abstract: A combined writing instrument and eraser dispenser wherein a twist and click actuator (4) is rotatably and axially slidable within an outercasing (5). A portion of the twist and click actuator extends from within a tail of the outercasing enough to provide a grip (4c) for twisting and clicking. Ensconced within the twist and click actuator is an eraser carriage (2), which holds a long eraser (3). The eraser carriage has two raised projections (2b) which sit in two cut away grooves (4b) running longitudinally in the twist and click actuator, and thus the twist and click actuator and the eraser carriage are relatively nonrotatable but are relatively axially slidable. Thereadably engaged within the eraser carriage is a lead pipe (1) which could be the lead pipe of a mechanical pencil or the ink cartridge of a ball point pen. Relative twisting of the eraser carriage and the lead pipe causes a relative axial motion.

Abstract: A longitudinal opening window (1B) is formed a: a rear end portion of a cylindrical casing (1) of a mechanical pencil. At the rear end of the cylindrical casing (1), an eraser holder (12) is disposed in such a way that it can move forward and rearward for a predetermined distance. At the rear end of the eraser holder (12), a rubber eraser (13) is mounted. At the front of the eraser holder (12), a cylindrical small diameter front portion (12B) is provided. On the outside of the small diameter front portion (12B) is disposed a stop portion (12D) protruding outwardly on a resilient piece (12C). The stop portion (12D) engages with the opening window (1B). The rear end of a lead reservoir (10) connected to the rear portion of a chuck (7) extends to the inside of the small diameter front portion (12B). When the cylindrical casing (1) is shaken, a weight (11) surrounding the lead reservoir (10) moves forward, thereby causing the chuck (7) to move forward.

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: An automatic pencil for automatically dispensing a writing lead comprises a hollow, longitudinal main body for receiving therein lead, and a mouthpiece detachably connected at its rear end to a front end of the main body for projecting a top of the lead received in the main body from a front end of the mouthpiece. A slider is movably disposed in a front portion of the mouthpiece for frictionally holding therein the lead, the slider being manually, reciprocally moveable in the axial direction of the pencil in response to writing pressure applied thereto during use of the pencil. A chuck is mounted in a rear portion of the mouthpiece for releasably clamping the lead during use of the pencil such that the chuck operates in response to the reciprocating movement of the slider to allow advancing movement of the lead toward the front end of the mouthpiece and to prevent retracting movement of the lead.

Abstract: A knocking type solid cosmetics container which comprises a container main body 1 comprising; a cylindrical pushrod housing pipe 6 inserted in the container main body 1; a delivery chuck 9 fixedly provided on a front end of the pushrod housing pipe 6, a pushrod 3 inserted into the pushrod housing pipe 6 and the delivery chuck 8; a tubular cartridge 2; and a piston 16 contained in the cartridge 2.

Abstract: In a mechanical pencil, a tubular lead reservoir is connected to the rearward end of a lead chuck. A cylindrical weight is fitted slidably around the lead reservoir and is adapted to strike against the chuck to open the same to allow forward feed of the lead when a forward shake is applied to the pen barrel. In order to prevent forward feed of the lead as a result of unintended forward shake while carrying the pencil, a slider disposed rearwardly of the lead reservoir has a radially outwardly extending engagement projection which is adapted to slidably engage either a longitudinal guide slot in the pen barrel or a lateral slot circumferentially and rearwardly extending in the pen barrel. When the engagement projection is in engagement with the lateral slot, the chuck is caused to take an advanced position in which the chuck is open so that a forward stroke cannot feed the lead forward.

Abstract: A refill lead writing instrument for stepped advancement of a lead has a spring biased clamping device for holding a lead in direction of its longitudinal axis against a writing pressure. The clamping device includes a clamping chuck supported in a clamping sleeve under a spring action and a longitudinally displaceable lead pipe against which the clamping chuck can abut. A gripping part is form-lockingly connected with a shaft so that the shaft and the gripping part are rotatable relative to one another about a common longitudinal axis. The shaft and the gripping part have opening of same diameters and provided with grooves. A longitudinally displaceable supporting pipe has strips guiding in the grooves, one of the grooves having an extension extending in direction of the writing pipe and formed as a recess in which one of the strips is turnable.

Abstract: A container for extending a stick-shaped material comprises a tubular body and a chuck formed on the tubular body inserted into a chuck ring. The tubular body and the chuck ring are provided with first and second deflectable projecting parts respectively, while a head member is provided with first and second retaining holes the first deflectable projections of the tubular body engage the first retaining holes, while the second deflectable projecting parts of the chuck ring engage the second retaining holes of the head member. A resilient elastic body is mounted between the end of the head member and an elastic body bearing formed on the tubular body. A stick-shaped material such as a stick-shaped eraser is held in the head member and the chuck. The tubular member, the chuck ring, the stick-shaped material and the elastic body are assembled as a unit with the head member. Therefore, the number of parts is reduced and assembly and disassembly becomes relatively easy.

Abstract: A drawing device for use in a drafting machine includes one length of long casing; a lead guide fixedly secured to the leading end of the casing; one length of pipe member inserted from the other end side of the casing into the same in such a manner as to be axially slidably moved freely; a piece of chuck ring fixedly secured to the interior of the leading end portion of the pipe member; a piece of sleeve fitted closely over and fixedly secured to the outer peripheral surface of the other end side portion of the pipe member; one length of lead stock inserted from the other end side of the pipe member into the same in such a manner as to be slidably moved freely; and a lead chuck fixedly secured to the leading end portion of the lead stock in such a manner that its leading end side portion may be radially deformed or expanded and contracted in cooperation with the chuck ring, and is characterized by further comprising a regulating piece fitted over the rear end of the lead stock in such a manner as to be slida

Abstract: The present invention relates to a swing-type mechanical pencil wherein lead can be extended from a head member connected to an outer sleeve by swinging the outer sleeve to move a knocking hammer. The knocking hammer applies a lead-feeding action to feed the lead. A chuck shutting hammer is mounted between a spring bearing of a chuck ring sleeve retaining a chuck ring which is a component of the lead holder and a second spring connected with the chuck. An upward movement of the chuck shutting hammer forces the chuck into a chuck ring. This provides a positive action to shut the chuck preventing slipping of the lead when writing with the mechanical pencil. Manual advance of lead is provided by a slider in a recession an outer surface of the sleeve that engages the lead holder allowing the chuck to be manually opened to extend lead.

Abstract: A side actuated writing implement wherein projections are provided to prevent the wave-shaped actuating member from straightening out.

Abstract: This invention relates to a mechanical pencil capable of utilizing effectively a writing lead and having an improved lead protection pipe. A protuberance having a surface having a hardness equal to, or higher than, that of a lead is formed on the inner surface of the lead protection pipe by dispersing and depositing powder; very small coil-like fibers having a surface having hardness equal to, or higher than, that of the lead are dispersed and deposited on the inner surface of the lead protection pipe through a base material; an inorganic film having a protuberance having hardness equal to, or higher than, that of the lead is formed on the inner surface of the lead protection pipe; or a ring-like lead retaining member is disposed inside the lead protection pipe. The lead retaining member has a treated portion having a surface having hardness equal to, or higher than, that of the lead, and a partial play relative to the inner surface of the lead protection pipe.

Abstract: This invention is to a writing tool such as mechanical pencil or a ballpoint pen in which a writing shaft having a head member is inserted in an outer sleeve in such a manner that the head member projects from the outer sleeve. A stair or step and a spiral groove are providd on the forward inner surface and the rearward inner surface of a tubular cap, respectively with an inside diameter of the rear part of the spiral groove being larger. A bearing part is brought into contact with a lead tank provided inside a forward art of the tubular part so that the forward part of the outer sleeve is movable in the axial direction and is locked in the turning direction against a rearward inner surface of the outer sleeve. The rearward part of the tubular body is provided with a slit, holding pieces of a stick-shaped object holder slidably inserted in said slit. A stick-shaped object is held by the holding pieces, and the projection is provided on each holder engaged with the spiral groove of the tubular cap.

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 knock-out type mechanical pencil which comprises a lead containing tube in which the inner and outer walls thereof are so tapered that the lead inlet thereof is larger in diameter than the opposite end thereof. The mechanical pencil further comprises a spring supporting ring interposed between the clamping ring so attached to the outer periphery of a chuck portion integrally formed with the lead guide of the lead containing tube and spiral springs to oppose with the base end of the ferrule within the outer barrel for urging the spring supporting ring to the ferrule. Thus, this mechanical pencil can eliminate the lead jams in the lead containing tube and lead breakage therein.

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 knock-type propelling pencil includes a lead pipe inserted into an outer cylinder and having a lead chuck at the end portion thereof, a chuck-fastening tube for fastening the lead chuck, a cushion sleeve coming into contact with the chuck-fastening tube and being slidable relative to the outer cylinder, and being urged by a spring. The cushion sleeve has a cushion portion which can be resiliently deformed to absorb excessive writing pressure and thereby preventing breaking of the lead.

Abstract: A lead cartridge for a mechanical pencil, provided with an openable capping structure. The openable capping structure is fixedly joined to the open end, namely, the front end, of the lead cartridge so as to engage the lead guide of the mechanical pencil when the lead cartridge is inserted in the mechanical pencil. The openable capping structure opens a lead passage formed therein when engaged with the lead guide and closes the lead passage when separated from the lead guide to prevent the leads contained in the lead cartridge falling off the lead cartridge.

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 with a chuck made of plastics includes a lead case connected with the chuck, a ring arranged to surround and hold the chuck, and a spring for biasing the chuck toward a position where it is engaged with the ring, all of which are disposed within a tubular housing. The plastic chuck includes a cylindrical tube connected with the lead case and three elastically deformable extensions integral therewith. Each of these extensions has an engaging portion for grasping a lead and a connecting portion whose inner surface axially forms a curve of secondary degree extending from the cylindrical tube and expanding radially toward the engaging portion in its free state, so that the engaging portion aligns with the lead when it is engaged with the ring. Accordingly, a grasping force is uniformly applied around the lead.

Abstract: A thrust-action mechanical pencil having a lead-forwarding mechanism and an outer sleeve, the lead-forwarding mechanism being inserted from the rear end of the outer sleeve. An elastic member to prevent looseness is inserted between a chuck ring sleeve, and an inner ring provided on the inside of the outer sleeve to prevent forward movement. A tubular retaining sleeve having a full length slit is installed between a mouth piece and a stepped portion of the lead forewarding mechanism. A retaining portion on the forward end of the retaining sleeve is set between the mouth piece and the forward end of the outer sleeve to retain the lead-forwarding mechanism in the pencil.

Abstract: A mechanically controlled writing apparatus with presharpened pencil lead elements generally comprises of an inner cylinder and a pen-holder. The inner cylinder is a straight hollow tube, having two elongated piercing grooves vertically made at the bottom to permit the bottom end be slightly expanded for passing therethrough of pencil lead elements, and a plurality of wedge-like projections made on the outer wall surface at the bottom end and respectively reducing upward, which wedge-like projections may be squeezed inward by the inner wall surface of the outer pen-holder to firmly retain the bottom pencil lead element for smooth writing. The pen-holder comprises a reduced bottom end having a hook means integrally made thereon to alternatively insert through the two elongated piercing grooves into the inner cylinder, which hook means may be controlled to displace outward through a lever motion effect.

Abstract: The invention contemplates a swivel cosmetic container of propel/repel variety wherein metering action is achieved by plural resilient detent engagements which are readily sensed as multiple equal subdivisions of each single revolution of the parts exposed for manipulated relative rotation. And a single elastomeric seal ring establishes hermetic sealing of container contents as well as detent retention of an applied closure cap.

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 mechanical pencil is disclosed in which lead can be advanced in one of two ways; either automatically upon release of writing pressure on the pencil, or selectively manually by pressing inwardly against a side push button. The pencil includes an outer cylinder with a side pushing hole formed therein, and a side push button movably disposed in the side pushing hole. The side push button contacts a lever which is totally mounted within the outer cylinder and which contacts a lead advanced mechanism. Upon pressing in of the side push button, the lever is pivoted about its axis and caused to press downwardly against the lead advance mechanism to thereby cause advancement of a lead. Advancement of lead is also performed upon release of writing pressure of the pencil by way of a slider mechanism which is biased outwardly by way of a resilient member and which is forced outwardly by the resilient member upon release of writing pressure.

Abstract: A lead-replaceable writing implement including an outer tube, an inner rod received in the outer tube and formed with multiple lead channels and a push rod, a rotary tube partially inserted into a lower end of the outer tube, and a lead holder received in the rotary tube and partially protruded beyond the lower end thereof, wherein the multiple lead channels respectively contain several series of leads of different hardness, and the rotary tube is formed with a lead stop whereby when rotating the rotary tube to locate the lead stop right above a lead channel and then push the inner rod upward, the lead stop will stop a lowest lead with desired hardness from rising and drop the stopped lead into the lead holder, and when thereafter pressing the inner rod downward, the push rod thereof will partially protrude the dropped lead beyond the lead holder for writing.

Abstract: The present invention relates to a swing-type mechanical pencil wherein lead can be extended from a head member connected to an outer sleeve by swinging the outer sleeve to move a knocking hammer. The knocking hammer applies a lead-feeding action to feed the lead. A chuck shutting hammer is mounted between a spring bearing of a chuck ring sleeve retaining a chuck ring which is a component of the lead holder and a second spring connected with the chuck. An upward movement of the chuck shutting hammer forces the chuck into a chuck ring. This provides a positive action to shut the chuck preventing slipping of the lead when writing with the mechanical pencil. Manual advance of lead is provided by a slider in a recession an outer surface of the sleeve that engages the lead holder allowing the chuck to be manually opened to extend lead. The recess in the outer sleeve has a restriction that is engaged by a projection in the slider to lock the slider and lead holder against movement and prevent advancing of lead.

Abstract: An automatic pencil includes a front housing and a rear housing. A lead-propelling unit and a control unit are positioned within the front and rear housings respectively. The control unit is retained on the propelling unit. When the rear housing is continuously rotated relative to the front housing in a certain direction, a lead rod intermittently moves forward to project from the pencil tip. The propelling unit has a first engagement element, while the control unit has a second engagement element. Each of the first and second engagement elements has several sprocket teeth provided annularly on an end surface thereof. After use, the rear housing may be rotated relative to the front housing in the opposite direction so that the barbed ends of the second engagement element pull the barbed ends to the first engagement element backward. A compression spring helps the first engagement element, and hence the lead rod projecting from the pencil tip, to move backward.

Abstract: A writing instrument includes a hollow body, a depression mechanism including a grip unit having an outer periphery radially displaceable in accordance with a gripping force exerted by writer's fingers, the depression mechanism including an axially displaceable member which moves axially in accordance with an increase of a pressure of due to radial displacement of the grip unit and which returns to its original position in accordance with a decrease of a pressure of the grip unit, the axially displaceable member being provided in association with the grip unit, a writing member including lead with a writing tip, and a writing member actuating mechanism for moving the writing tip to a writing position. The writing member actuating mechanism includes a normally open chuck, a lead holder positioned between the chuck and tip for constantly holding the lead, and an axially moveable tightening mechanism for engaging with and disengaging from the chuck and disposed on a side of the chuck opposite the writing tip.

Abstract: A lead feed mechanism for a mechanical pencil, in which a lead protruded by a certain length from a lead protection pipe housed in a bottom member attached at the bottom of the pencil is fed together with the pipe, and which comprises a lead chuck which is split in plural parts along the axis of the pencil and whose bottom sections pinch the lead on its outside circumferential surface. A sleeve contains the lead chuck so as to urge the lead chuck upwards by an elastic member. The sleeve includes an engaging portion provided on the inside circumferential surface of the top portion of the sleeve and engaged with an engaging portion provided on the outside circumferential surface of a bottom bearer for a lead pipe in which a spare lead is housed. A frame is provided around the sleeve which is fitted on the bottom with a pushing member which bears by the open top of the frame an elastic member provided between the bottom bearer and the frame.