CN201501196U

CN201501196U - Extensible automatic pencil

Info

Publication number: CN201501196U
Application number: CN2009201227002U
Authority: CN
Inventors: 韩爱国; 郑根有
Original assignee: WENZHOU TIANJIAO PEN INDUSTRY Co Ltd
Current assignee: WENZHOU TIANJIAO PEN INDUSTRY Co Ltd
Priority date: 2009-06-12
Filing date: 2009-06-12
Publication date: 2010-06-09
Anticipated expiration: 2019-06-12

Abstract

The utility model relates to an extensible automatic pencil, comprising a pencil shell, a pencil lead clamping component, a pencil lead, a lead storing pipe for containing the pencil lead, a pencil lead axial feed mechanism and a pencil lead backstop mechanism, wherein the pencil lead clamping component is arranged at a pencil tip part and is provided with a lead outlet hole. The utility model is characterized in that the pencil lead is composed of a plurality of detachable pencil lead segments with one subulate end. The pencil lead of the extensible automatic pencil is composed of a plurality of same pencil lead segments, and each pencil lead segment is a cylinder with a subulate front segment, so the pencil lead does not need nibbing after the pencil lead is changed.

Description

A kind of extensible automatic pencil

Technical field

The utility model relates to a kind of extensible automatic pencil.

Background technology

Propelling pencil be owing to can pressing go out pencil-lead, but long-time continuous write, save time, easy to use, thereby liked by consumers in general, obtained using widely.As long as particularly this class pencil replenishes behind the pencil-lead just reusablely, unlike traditional pencil, need consume timber simultaneously, therefore meet the theory of environmental protection especially.Along with the variation of demand, extensible automatic pencil is also developed in the development of technology, uses convenient.As being 96224916.5 in the patent No., name is called " pen free of shapening automatically ", disclosed a kind of automatic pen free of shapening in the utility model patent of bulletin on October 15th, 1997, it is by an outer tube, pipe in one, one spring, one elastic spring is formed, outer tube is made of back outer tube and preceding outer tube, spring is passed in interior pipe front portion, enter the back outer tube from the outer tube rear portion, the anterior assembling of interior pipe elastic spring, the pin thread by the back outer tube spins mutually with the negative thread of preceding outer tube, there is pipe medium pore canal in the interior central authorities of managing, be used for loading pen core, interior pipe front end has a clamping part, and clamping part has a groove along outer wall of inner tube, the groove first half runs through outer wall of inner tube fully, on the interior tube body of groove tail end, have one with interior pipe be the bulge loop of one, interior pipe tail end has an afterbody, afterbody central authorities have one to replenish the duct, connect with interior pipe medium pore canal.The pen core of this automatic pen free of shapening when writing owing to be subjected to the support of reed body, thus unlikely retraction when writing, and because of the effect of the retaining chip of afterbody, pen core not the reason outer tube inversion and miss.When user's desire is changed pen core, at first stress on afterbody, rostrum is for outer tube in making, and this moment, reed body can be carried on groove, and leave the tail end of old pen core, the renewal pen core can be glided, and the user loosens afterbody then, and interior pipe returns back to original position because of the effect of spring, reed body is also along the groove reposition, make reed body prop up the afterbody that upgrades pen core, pipe in forward old pen core being released is finished pen core and is changed.Though this automatic pen free of shapening has solved the problem of exempting to cut of propelling pencil, structure is also simpler, also exists some defectives, as: when 1, changing core, interior pipe will have a joint of good length to protrude in outer tube, and bigger with traditional difference of starting writing certainly, the user is difficult for accepting; When 2, writing, pen core is to withstand by the end of reed body to prevent to retreat, thus the pen core discontinuity, simultaneously because reed body has certain elasticity, pen core shakiness in the time of can causing writing; 3, this pen is in changing the core process, at first stress on afterbody, rostrum is for outer tube in making, and this moment, reed body can be carried on groove, and the endoporus that leaves the tail end of old pen core and interior pipe makes and upgrades pen core and can glide, the user loosens afterbody then, interior pipe returns back to original position because of the effect of spring, and reed body makes reed body prop up the afterbody that upgrades pen core also along the groove reposition, pipe in forward old pen core being released is finished the replacing action of pen core.But the wearing and tearing of the endoporus of pipe became big in long-term use can make, and when interior rostrum during for outer tube, the clamping force of interior pipe front end causes upgrading pen core pipe front end in old pen core skids off with complete obiteration, changes the core failure.As a same reason, also than higher, too big error can not be arranged to the diameter coherence request of pen core, adaptability is limited.

The utility model content

The purpose of this utility model be for overcome the deficiencies in the prior art provide a kind of change core reliable, write stable, pen core adaptability is wider, the extensible automatic pencil of longer service life.

For achieving the above object, the utility model discloses a kind of extensible automatic pencil, comprise a shell, the pencil-lead separable by multistage and lead for retractable pencil section that an end is tapered is formed, be used to hold the storage core pipe of pencil-lead, axial ejecting type propulsive mechanism of pencil-lead and stopping mechanism, described ejecting type propulsive mechanism comprises an ejection piece that is exposed at the outer thrust piece of a shell and links with thrust piece, described ejection piece has LAP at least in the knockout process be to enter in the storage core pipe to withstand on the relative other end of lead for retractable pencil section tapering point, it is characterized in that: be respectively equipped with the screens structure between a described storage core tube wall and the shell inwall and will store the core tubular axis with locating to being arranged in the shell, be provided with the pencil-lead clamp assemblies in knockout hole in nib portion, the center line of described storage core pipe overlaps with the knockout centerline hole, described storage core pipe orifice docks with the knockout hole forms the pencil-lead passage, constitutes stopping mechanism but be provided with the bayonet socket that place's channel cross-section is slightly less than end section after the lead for retractable pencil section and elastic dilatation in the described pencil-lead passage.

Compared with prior art, because extensible automatic pencil of the present utility model, but be provided with the bayonet socket that cross section, a place is slightly less than end section after the lead for retractable pencil section and elastic dilatation in the storage core pipe and constitute stopping mechanism, when changing core because ramp effect and elastic dilatation passes through by the lead for retractable pencil section, the rear end of lead for retractable pencil section is to withstand on the bayonet socket when writing, therefore highly stable reliable, can never after contract, do not have interior rostrum to go out when changing core yet.In addition, even the pencil-lead clamp assemblies at nib place has also remained clamping force when changing core, therefore upgrade pen core and can not skid off with old pen core, also wider to the adaptability of pen core, and be not afraid of the wearing and tearing of pencil-lead clamp assemblies knockout hole and become big, longer service life.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Description of drawings

Accompanying drawing 1 is the utility model specific embodiment structure cutaway view;

Accompanying drawing 2-5 is that the utility model changes core process substep partial schematic sectional view;

Accompanying drawing 6 is local enlarged diagram;

Accompanying

drawing

7,8 is a sliding push type ejecting type axial advance mechanism specific embodiment structure cutaway view;

Accompanying

drawing

9,10 is pressed ejecting type axial advance mechanism specific embodiment structure cutaway view for side;

Accompanying drawing 11 is the shift sleeve structure schematic diagram;

The specific embodiment

As shown in Figure 1, extensible automatic pencil comprise a shell, be arranged on nib portion the pencil-lead clamp assemblies, the pencil-lead that have the knockout hole, be used to hold storage core pipe, pencil-lead axial advance mechanism and the stopping mechanism of pencil-lead.Shell is made up of the point cover 4 of tubulose penholder 6 and approximate taper, pencil-lead is made up of the identical lead for retractable pencil section 1 of multistage, one section of every section lead for retractable pencil section 1 close writing end is tapered, remainder is a cylindricality, can be different according to different situations and use occasion, tapered portion as pencil-lead is a wedge shape, and cylindrical portion is four stupefied cylinders, conveniently uses on answering card.But the most frequently used is that tapered portion is a cone, and cylindrical portion is a cylinder.Pencil-lead is placed in the storage core pipe movingly, and the conical end of lead for retractable pencil section 1 is towards the nib direction.Pencil-lead axial advance mechanism can be lead for retractable pencil section 1 clipping propulsive mechanism or ejecting type propulsive mechanism in the extensible automatic pencil.The structure that clipping propulsive mechanism is general is evenly to be provided with two or three axially saturating grooves on storage core tube wall, be arranged with the claw-like clamping head that has central through hole movingly on the storage core pipe outer tube wall, clamping head is provided with the locking member that becomes the inclined-plane to cooperate and can axially relatively move with the clamping head outer surface outward, the pawl index of claw-like clamping head is identical with saturating groove, the pawl finger stretches into movingly and clamps on lead for retractable pencil section 1 cylinder in the groove thoroughly, pressing piece and clamping head interlock are provided with, and also be provided with elastomeric element simultaneously locking member is contacted with the extruding of clamping head elasticity.Add pressing power on pressing piece, clamping head and nipped pencil-lead break away from locking member after producing the displacement of lead for retractable pencil section 1 length together forward, at this moment clamping head under the elastic force effect of self calvus separately, return under the elastomeric element effect.This mode structure is complicated, and the diameter of a pencil shell also will be thicker.

Adopt tail end to push the ejecting type propulsive mechanism in this specific embodiment, have the characteristics of reliable operation simple in structure.Tail end is pushed the ejecting type propulsive mechanism and is comprised an ejection piece and a back-moving spring 9 thereof that is exposed at the outer thrust piece of a shell tail end and links with thrust piece, the ejection piece front end has the writing position of a return under back-moving spring 9 effect and tries hard to recommend the knockout position of pressing after thrust piece puts in place outside, and ejection piece is that the ejection piece front end moves to from writing position that to have LAP the process of knockout position at least be to enter to store in the core pipe to withstand on the relative other end of lead for retractable pencil section 1 tapering point in the knockout process.Wherein storing the core pipe can be one, and the core pipe 10 that falls of the hollow in also can being inserted by the interior bar 5 of one section hollow and one section part in the bar 5 is formed by connecting and produces with convenient, total length basic with a shell in cavity length matches.Storage core pipe one, between a storage core tube wall and a shell inwall, be respectively equipped with the screens structure and will store the core tubular axis with locating to being arranged in the shell, as store the interior bar 5 of core Guan Youyi section hollow and one section part insert in hollow in the bar 5 core pipe 10 that falls be formed by connecting, interior bar 5 outer walls and a shell inwall be respectively equipped with between penholder 6 inwalls screens structure with interior bar 5 axial location be arranged in the shell, prevent in the knockout process that storage core pipe moves and cause the knockout location inaccurate.The central lines in the center line of interior bar 5 endoporus and the knockout hole of pencil-lead clamp assemblies, the front end and the knockout hole of interior bar 5 endoporus connect, can be slightly gapped, but guarantee that lead for retractable pencil section 1 can enter the knockout hole of pencil-lead clamp assemblies smoothly, as shown in Figure 6, the screens structure can be cooperating of ring muscle 12 and annular groove 13, interior bar 5 preferably identical with core pipe 10 internal diameters that fall and with the pencil-lead matched in clearance.Be arranged with helical spring on the storage core pipe in the described pressing bar and constitute described back-moving spring, the helical spring two ends are against respectively on the shoulder rank that storage core tube wall and pressing bar inwall be provided with, as store the interior bar 5 of core Guan Youyi section hollow and one section part insert in hollow in the bar 5 core pipe 10 that falls be formed by connecting, then outside the interior bar 5 that constitutes storage core pipe and the core pipe 10 that falls, be arranged with tubulose pressing bar 8 movingly, be arranged with helical spring on the interior bar 5 in the described pressing bar 8 and constitute back-moving spring 9, on the shoulder rank of bar 5 end faces and pressing bar 8 inwalls, storage core pipe formed the setting that can make things convenient for back-moving spring 9 by two sections grafting in the helical spring two ends were against respectively.The tail end of pressing bar 8 is provided with hat and presses 11, presses 11 end and exposes the formation thrust piece from the rear end of penholder 6.The middle part of bar 5 tube walls in guide groove 14 can be arranged on, but the front end of bar 5 tube walls in guide groove 14 preferably is arranged on, this is in order to guarantee the pencil section in the storage core pipe to be used up, the axial grooving formation that guide groove 14 is matched with ejection piece (matched in clearance) by width and communicates with the pencil-lead passage, ejection piece is made of knockout spring 7, knockout spring 7 is a strip sheet metal, be arranged on vertically outside the interior bar 5, tail end fixedly is inserted on the front end of pressing bar 8, inside bar 5 bendings of knockout spring 7 front ends, the ejection piece front end has one and promptly presses a knockout position after 11 at the writing position under back-moving spring 9 effect with at the pressed by external force thrust piece, guide groove is in the deformation trace of knockout spring front end, the knockout position is between the knockout aperture of storage core pipe front end exit and pencil-lead clamp assemblies, guide groove 14 length are advisable between lead for retractable pencil section 1 length of one times and twice, the rear end that knockout spring 7 front ends all can withstand on lead for retractable pencil section 1 when guaranteeing to change core ejects it to pencil-lead clamp assemblies centre bore from interior bar 5 fully, and only ejects one section at every turn.In order to guarantee to allow knockout spring 7 front ends in progradation, can accurately enter guide groove 14, above the outer surface guide groove 14 of interior bar 5, be provided with the axial shallow slot that is connected with guide groove 14 in this specific embodiment and constitute gathering sill 15, and the writing position of knockout spring 7 front ends is in the gathering sill 15.Reliable in order to write, particularly reliable more and increase the service life when writing more energetically, but in the pencil-lead passage, be provided with the bayonet socket formation stopping mechanism that place's channel cross-section is slightly less than lead for retractable pencil section 1 back end section and elastic dilatation, the rear end face of lead for retractable pencil section 1 can be resisted against naturally storage core pipe bayonet socket on, contract behind the pencil-lead in the time of can preventing to write, and the fatigue problem that does not have elastomeric element has prolonged service life of extensible automatic pencil.Stopping mechanism can have more than a kind of structure, it is just like shown in Figure 2 in this specific embodiment, the endoporus front end of interior bar 5 is tapered, outlet is slightly less than lead for retractable pencil section 1 diameter, but being provided with some axis groovings, the bar wall of outlet makes the outlet elastic dilatation, and the outlet diameter of bar 5 endoporus front ends keeps less than lead for retractable pencil section 1 diameter under situation about not stressing, and contracts after preventing to be in the lead for retractable pencil section 1 in the pencil-lead clamp assemblies.The pencil-lead clamp assemblies is made up of chuck 2 and chuck spring 3, chuck 2 outer walls will be provided with the circular cone inclined-plane, the center is provided with the knockout hole, the outer wall leading portion is provided with some axial groovings makes the knockout hole that the contraction of certain limit can be arranged under external force, the chuck 2 outer chuck springs 3 that are arranged with, shell nib portion is provided with the cavity volume that matches with chuck 2, chuck 2 and chuck spring 3 are arranged in the cavity volume, described shell nib portion is provided with the taper surface that matches with chuck outer wall circular cone inclined-plane, and described chuck spring 3 two ends are against respectively on chuck 2 and the cavity volume inwall.Under the effect on chuck spring 3 and inclined-plane, make chuck 2 have clamping force all the time.As shown in Figure 2, in this specific embodiment, it is cylindric that described chuck 2 profiles are two joint ladders, the center equally preferably is provided with two joint ladder cylindrical holes vertically, constitute the knockout hole near a joint diameter of nib less matching with lead for retractable pencil section 1, the deutomerite diameter inserts for interior bar 5 front ends with interior bar 5 front end matched in clearance and makes interior bar 5 endoporus dock composition pencil-lead passage with the knockout hole, the length in knockout hole is suitable, preferably identical or be slightly less than with the cylindrical part length of lead for retractable pencil section 1, with bar 5 front ends in guaranteeing is that withstanding on top is the rear end of first lead for retractable pencil section 1, chuck 2 leading portion outer walls become pre-large post-small some the axial groovings that are provided with to make the knockout hole have certain elasticity, chuck spring 3 is set on the back segment of chuck 2, shell nib portion i.e. point cover 4 is provided with the cavity volume that matches with chuck 2, the cavity volume inwall is provided with the shoulder rank, chuck 2 and chuck spring 3 are arranged in the cavity volume, the cavity volume of described point cover 4 is provided with the taper surface that matches with the leading portion outer wall, chuck spring 3 two ends are against respectively on the shoulder rank of chuck 2 and cavity volume inwall and make chuck 2 have the power that contracts in one, and the interaction of the active force by chuck spring 3 and the taper surface of point cover 4 and chuck 2 leading portions clamps pencil-lead.Its two, stopping mechanism can also be storage core pipe promptly in bar 5 or the core pipe 10 inwall upper edges that fall circumferentially evenly be provided with several and be provided with cross section projection triangular in shape, generally be advisable in that 3-5 is individual.As store core pipe one, and also can be directly tapered at the front end endoporus of storage core pipe, the inner orifice diameter is slightly less than lead for retractable pencil section diameter, and the inner orifice of storage core pipe front end is provided with some axial groovings and constitutes stopping mechanism.Projection is towards the one side of nib and the axis normal of the interior bar 5 or the core pipe 10 that falls, this identity distance is the integral multiple of lead for retractable pencil section 1 length from the tip of forefront lead for retractable pencil section 1, another side is the inclined-plane, and the tube wall of projection both sides is provided with axial grooving makes this place's tube wall have certain elasticity.The tail end push type propulsive mechanism that provides in the foregoing description is arranged with tubulose pressing bar movingly owing to having adopted outside being provided with the storage core pipe of guide groove, the fixing mode that constitutes the knockout spring of ejection piece on the pressing bar, package wall does not have the element of evagination outward, therefore outward appearance is succinctly attractive in appearance, and the diameter of a shell also can be done smallerly simultaneously.

The ejecting type propulsive mechanism can also have sliding push type and side by two kinds of formulas except the tail end push type that provides above.

As Fig. 7, shown in 8, in the sliding push type ejecting type propulsive mechanism, storage core pipe can be made up of an independent pipe fitting such as interior bar 5, guide groove 14 is arranged on the tube wall of interior bar 5, guide groove 14 length are between lead for retractable pencil section 1 length of one times and twice, correspondence position is provided with push button chute 17 on the penholder 6, push button 18 is slidably disposed on the push button chute 17, push button chute 17 is longer than guide groove 14, described push button 18 is provided with towards interior bar 5, but elastic telescopic, cross section projection 19 triangular in shape constitutes described ejection piece, projection 19 is slidingly matched for 14 one-tenth with guide groove, projection 19 is towards the one side of nib and the axis normal of interior bar 5, and another side is the inclined-plane, and guide groove 14 is on the track of projection 19 slide displacements, be arranged with on the interior bar 5 helical spring constitute back-moving spring 9, the helical spring two ends are against respectively on the shoulder rank of push button 18 and interior bar 5 outer walls.Equally, in order to guarantee to allow projection 19 front ends in progradation, can accurately enter guide groove 14, above the outer surface guide groove 14 of interior bar 5, also can be provided with the axial shallow slot that is connected with guide groove 14 and constitute gathering sill 15, and the writing position of projection 19 front ends is in the gathering sill 15.

As Fig. 9, shown in 10, press in the ejecting type propulsive mechanism in side, storage core pipe can be made up of an independent pipe fitting such as interior bar 5, be arranged in the shell as on interior bar 5 outer walls with being provided with screens structure axial location, described as sidewall interior bar 5 is provided with axial channel 14, guide groove 14 length are equally between lead for retractable pencil section 1 length of one times and twice, be arranged with sliding sleeve 20 as matched in clearance on interior bar 5 sidewall guide grooves 14 positions, sliding sleeve 20 is provided with the described ejection piece of shell fragment 201 formations with guide groove 14 matched in clearance, described shell fragment 201 is free end near the nib end, the other end is fixed on the sliding sleeve 20 and is to storage core tube hub, make free end have the elastic force that points to interior bar 5 centers, shell correspondence position is provided with side direction button cavity volume, side direction button cavity volume promptly is advisable near a shell tail end to be arranged on sliding sleeve 20 tops, be provided with side direction button 21 in the side direction button cavity volume, side direction button 21 upper ends are journaled on side direction button 21 chamber wall and constitute thrust piece, the other end of side direction button 21 is that the lower end is a free end, the pivot dress axle 16 of side direction button 21 is perpendicular with interior bar 5 central shafts, the free end of side direction button 21 and sliding sleeve 20 offset away from an end of nib, sliding sleeve 20 is the inclined-plane setting away from an end of nib, bar 5 is outer in described is arranged with helical spring and constitutes described back-moving spring 9, and the helical spring two ends are against respectively on the shoulder rank of sliding sleeve 20 near end of nibs and interior bar 5 outer walls.

Extensible automatic pencil with tail end push type ejecting type propulsive mechanism is that example is introduced its operation principle:

Under Fig. 2-4 elastic force effect that is shown in back-moving spring 9, eject spring 7 front ends and be retracted in the gathering sill 15 of interior bar 5 sides, lead for retractable pencil section 1 is fallen the front portion under the effect of deadweight, blocked by interior bar 5 front ends, the rearward end of this root lead for retractable pencil section 1 that fall to this moment has exceeded and has ejected spring 7 front end (see figure 2)s.In the time of need going out (changing) core, press and press 11, it drives pressing bar 8 and ejects the front end that spring 7 went ahead (ejecting spring is fixed on the pressing bar 8), ejects this moment spring 7 together and withstands on the rear end face of the lead for retractable pencil section 1 that has fallen, lead for retractable pencil section 1 continues to move down that (bar 5 front ends are forced to be subjected to crowded opening in this moment under the promotion of pressing the pressure on 11, Fig. 3) when lead for retractable pencil section 1 rear end face surpasses the front end of interior bar 5 fully, interior bar 5 front ends recoil to nature, and end face has withstood on lead for retractable pencil section 1 rear end face (Fig. 4).Then, decontrol hand, under the effect of back-moving spring 9, pressing bar 8 drive eject spring 7 return back in 15 li of the gathering sills of bar 5, finish a knockout action.And the lead for retractable pencil section 1 that is ejected is withstood because of the rear end, and the side is not clamped and can be retreated and drop by chuck 2, promptly is in the state of can writing, (as Fig. 5).The pressing that repeats has just reached the purpose that continues to change core.

Claims

1. extensible automatic pencil, comprise a shell, the pencil-lead separable by multistage and lead for retractable pencil section that an end is tapered is formed, be used to hold the storage core pipe of pencil-lead, axial ejecting type propulsive mechanism of pencil-lead and stopping mechanism, described ejecting type propulsive mechanism comprises an ejection piece that is exposed at the outer thrust piece of a shell and links with thrust piece, described ejection piece has LAP at least in the knockout process be to enter in the storage core pipe to withstand on the relative other end of lead for retractable pencil section tapering point, it is characterized in that: be respectively equipped with the screens structure between a described storage core tube wall and the shell inwall and will store the core tubular axis with locating to being arranged in the shell, be provided with the pencil-lead clamp assemblies in knockout hole in nib portion, the center line of described storage core pipe overlaps with the knockout centerline hole, described storage core pipe orifice docks with the knockout hole forms the pencil-lead passage, constitutes stopping mechanism but be provided with the bayonet socket that place's channel cross-section is slightly less than end section after the lead for retractable pencil section and elastic dilatation in the described pencil-lead passage.

2. extensible automatic pencil according to claim 1 is characterized in that: the front end endoporus of described storage core pipe is tapered, and the inner orifice diameter is slightly less than lead for retractable pencil section diameter, and the inner orifice of storage core pipe front end is provided with some axial groovings and constitutes stopping mechanism.

3. extensible automatic pencil according to claim 2, it is characterized in that: described storage core pipe comprise the interior bar of one section hollow and one section part insert in hollow in the bar core pipe that falls, be respectively equipped with between bar outer wall and the shell inwall in described the screens structure with interior bar axial location be arranged in the shell; The front end endoporus of bar is tapered in described, and the inner orifice diameter is slightly less than lead for retractable pencil section diameter, and inner orifice is provided with some axial groovings and constitutes stopping mechanism.

4. extensible automatic pencil according to claim 1, it is characterized in that: described storage core inside pipe wall upper edge circumferentially evenly is provided with several cross sections projection triangular in shape, projection is vertical with storage core tubular axis line towards the one side of nib, another side is the inclined-plane, the tube wall of projection both sides is provided with axial grooving makes this place's tube wall have certain elasticity, constitutes described stopping mechanism thus.

5. according to claim 1 or 2 or 3 or 4 described extensible automatic pencils, it is characterized in that: described pencil-lead clamp assemblies is made up of chuck and chuck spring, described chuck outer wall is provided with the circular cone inclined-plane, the center is provided with the knockout hole, the outer wall leading portion is provided with some axial groovings, chuck is arranged with the chuck spring outward, shell nib portion is provided with the cavity volume that matches with chuck, chuck and chuck spring are arranged in the cavity volume, described shell nib portion is provided with the taper surface that matches with chuck outer wall circular cone inclined-plane, and described chuck both ends of the spring is against respectively on chuck and the cavity volume inwall.

6. according to claim 1 or 2 or 3 or 4 described extensible automatic pencils, it is characterized in that: the tube wall of described storage core pipe is provided with the guide groove that width matches with ejection piece and the saturating groove that communicates with the pencil-lead passage constitutes, described storage core pipe is arranged with tubulose pressing bar outward movingly, be arranged with helical spring on the storage core pipe in the described pressing bar and constitute described back-moving spring, the helical spring two ends are against respectively on the shoulder rank that storage core tube wall and pressing bar inwall be provided with, the tail end of pressing bar is provided with hat and presses head, press head and expose the formation thrust piece from a shell tail end, described ejection piece is made of the knockout spring, the knockout spring is a strip sheet metal, tail end is fixed on the pressing bar, the inside bar bending of knockout spring leading portion, described guide groove is in the deformation trace of knockout spring front end.

7. extensible automatic pencil according to claim 5, it is characterized in that: the tube wall of described storage core pipe is provided with the guide groove that width matches with ejection piece and the saturating groove that communicates with the pencil-lead passage constitutes, described storage core pipe is arranged with tubulose pressing bar outward movingly, be arranged with helical spring on the storage core pipe in the described pressing bar and constitute described back-moving spring, the helical spring two ends are against respectively on the shoulder rank that storage core tube wall and pressing bar inwall be provided with, the tail end of pressing bar is provided with hat and presses head, press head and expose the formation thrust piece from a shell tail end, described ejection piece is made of the knockout spring, the knockout spring is a strip sheet metal, tail end is fixed on the pressing bar, the inside bar bending of knockout spring leading portion, described guide groove is in the deformation trace of knockout spring front end.

8. according to claim 1 or 2 or 3 or 4 described extensible automatic pencils, it is characterized in that: described storage core tube wall is arranged in the shell with being provided with screens structure axial location, the tube wall of described storage core pipe is provided with the guide groove of the saturating groove formation that communicates with the pencil-lead passage, described guide groove becomes to be axially disposed within on the sidewall of storage core pipe, the position of the corresponding guide groove of shell is provided with axial push button chute, push button axially is slidably disposed on the push button chute and constitutes thrust piece, described push button is provided with towards storage core pipe, but the projection of elastic telescopic constitutes described ejection piece, described storage core pipe is arranged with helical spring outward and constitutes described back-moving spring, and the helical spring two ends are against respectively on the shoulder rank of push button and storage core tube wall.

9. extensible automatic pencil according to claim 5, it is characterized in that: described storage core tube wall is arranged in the shell with being provided with screens structure axial location, the tube wall of described storage core pipe is provided with the guide groove of the saturating groove formation that communicates with the pencil-lead passage, described guide groove becomes to be axially disposed within on the sidewall of storage core pipe, the position of the corresponding guide groove of shell is provided with axial push button chute, push button axially is slidably disposed on the push button chute and constitutes thrust piece, described push button is provided with towards storage core pipe, but the projection of elastic telescopic constitutes described ejection piece, described storage core pipe is arranged with helical spring outward and constitutes described back-moving spring, and the helical spring two ends are against respectively on the shoulder rank of push button and storage core tube wall.

10. according to claim 1 or 2 or 3 or 4 described extensible automatic pencils, it is characterized in that: described storage core tube wall is arranged in the shell with being provided with screens structure axial location, the sidewall of described storage core pipe is provided with axial channel, matched in clearance is arranged with sliding sleeve on the storage core pipe sidewall guide groove position, the shell fragment that sliding sleeve is provided with the guide groove matched in clearance constitutes described ejection piece, described shell fragment is free end near the nib end, the other end is fixed on the sliding sleeve, free-ended elastic force points to storage core tube hub, shell correspondence position is provided with side direction button cavity volume, be provided with the side direction button in the side direction button cavity volume, side direction button upper end is journaled on the side direction button chamber wall and constitutes thrust piece, the other end of side direction button is a free end, the pivot dress axle of side direction button is perpendicular with storage core tube hub axle, the free end of side direction button and sliding sleeve offset away from an end of nib, sliding sleeve is the inclined-plane setting away from an end of nib, described storage core pipe is arranged with helical spring outward and constitutes described back-moving spring, and the helical spring two ends are against an end of the close nib of sliding sleeve respectively and store on the shoulder rank of core tube wall.

11. extensible automatic pencil according to claim 5, it is characterized in that: described storage core tube wall is arranged in the shell with being provided with screens structure axial location, the sidewall of described storage core pipe is provided with axial channel, matched in clearance is arranged with sliding sleeve on the storage core pipe sidewall guide groove position, the shell fragment that sliding sleeve is provided with the guide groove matched in clearance constitutes described ejection piece, described shell fragment is free end near the nib end, the other end is fixed on the sliding sleeve, free-ended elastic force points to storage core tube hub, shell correspondence position is provided with side direction button cavity volume, be provided with the side direction button in the side direction button cavity volume, side direction button upper end is journaled on the side direction button chamber wall and constitutes thrust piece, the other end of side direction button is a free end, the pivot dress axle of side direction button is perpendicular with storage core tube hub axle, the free end of side direction button and sliding sleeve offset away from an end of nib, sliding sleeve is the inclined-plane setting away from an end of nib, described storage core pipe is arranged with helical spring outward and constitutes described back-moving spring, and the helical spring two ends are against an end of the close nib of sliding sleeve respectively and store on the shoulder rank of core tube wall.