JP3780686B2 - Retractable sharp pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a plurality of cam grooves are formed on the rear inner surface of the shaft cylinder, and a rotor is slidably disposed in the cam grooves, and a slider is disposed to press and rotate the rotor. It is related to the haunting type writing instrument.
[0002]
[Prior art]
A camshaft type in which a plurality of cam grooves are formed on the rear inner surface of the shaft cylinder, and a rotor is slidably / rotatably disposed in the cam groove, and a slider is disposed to press / rotate the rotor. Japanese Patent Publication No. 54-14524 is known as an example of a writing instrument. The claims include: “A distal end pipe 9 that projects from the distal end of the main body 1 to protect the core, an inner base 8 that holds the core holder 10, the chuck 5, and the fastener 6. The inside of the main body 1 is provided with the contents of the fastener receiver 7 made of the inner base and the core case 3 connected to the chuck, and the rear end of the fastener receiver 7 is moved forward by the knock. The first spring S1 is disposed between the main body 1 and the core case 3, and the second spring is disposed between the main body 1 and the clasp holder 7. The forward and backward mechanism for the contents, characterized in that the spring S2 is disposed, the contents are fixed at the forward position by the first large knock, the core is extended by the small knock, and the contents are stored by the second large knock. Sharp pencil with ". To have. In other words, by properly using the large knock and the small knock, the contents are caused to appear and disappear (large knock), and the core is extended (small knock).
[0003]
[Problems to be solved by the present invention]
However, in the above-described prior art, in order to use large knock and small knock properly, the pressing amount of the knock cap C is restricted by speculation or the pressing amount is controlled while looking at the stepped portion C1 of the knock cap. Had to do.
Here, it is difficult to restrict the amount of pressing of the knock cap C by speculation. If it is, the intention of performing a small knock (core feeding operation) becomes a large knock, and as a result, the contents are immersed. I couldn't write and I felt unhappy. Moreover, regulating the amount of pressing while looking at the stepped portion C1 has to be looked in from the lateral direction every time the knock is made, and the operation is very troublesome.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems. A plurality of cam grooves are formed on the inner surface of the shaft cylinder, and a rotor is slidably and rotatably disposed in the cam groove. In the retractable writing instrument in which the slider is arranged in a state of protruding from the rear end of the shaft cylinder to press and rotate, the middle shaft having a core feeding mechanism is abutted and arranged in front of the rotor, The slider is provided with a pressing member that always urges the center shaft rearward by a retracting spring , slides on the inner surface of the slider to press and rotate the rotor, and operates the core feeding mechanism. The first gist is that the middle shaft tip member is projected from the tip of the shaft cylinder by the advancement of the slider and the rotor, while the slider is arranged so as to protrude further, and a core feeding mechanism is provided inside the shaft cylinder. The inner shaft is installed to be slidable In deaths type writing instrument, with the slider in order to press the inner shaft disposing allowed protruding from the rear of the barrel, and it always biased backward by the middle axle and retractable spring, the inner surface of the slider The pressing member that slides and operates the core feeding mechanism is disposed so as to be able to protrude from the slider, while the forward member of the slider causes the tip member of the middle shaft to protrude from the tip of the shaft cylinder. A retractable sharp pencil characterized in that the outer shape of the slider is smaller than the outer shape of the shaft cylinder . A second gist is that the pressing member for operating the lead feeding mechanism is disposed so as to be able to protrude from the slider.
[0005]
【Example】
An example is shown in FIGS. Inside the shaft cylinder 1, a middle shaft 2 is arranged so as to be movable back and forth, and a tip 3 is detachably fixed to the front end of the shaft cylinder 1 by screwing or the like. A core feeding mechanism 4 is disposed inside the middle shaft 2, and a tip member 7 having a core detent member 6 provided at the front end of the middle shaft 2 via a connecting member 5 is detachable by screwing or the like. It is fixed to. The center shaft 2 having the core feeding mechanism 4 is always urged rearward by a retracting spring 8.
The lead feeding mechanism 4 includes a lead tank 9 that stores a plurality of leads, a chuck body 10 that is fixed to the front end of the lead tank 9 and that grips and releases the lead, and a chuck ring that opens and closes the chuck body 10. 11 and a chuck spring 12 that constantly urges the lead feeding mechanism 4 rearward to bring the chuck body 10 into a closed state. In this example, the resilience of the chuck spring 12 is set to be weaker than the resilience of the lug spring 8.
[0006]
On the other hand, a cam 13 is formed on the rear inner surface of the shaft tube 1, but it may be formed of a separate member and fixed integrally to the shaft tube 1. The cam 13 is composed of a plurality of radially formed projections 14 in the vertical direction in the drawing, and an inclined surface 15 is formed on the front end surface of the projection 14. A rotor 16 is fitted in the cam 13. A protrusion 17 is also formed on the outer peripheral surface of the rotor 16, and a mountain-shaped inclined surface 18 is formed on the rear end surface of the protrusion 17. The protrusion 17 of the rotor 16 engages with the inclined surface of the protrusion 14 formed on the cam 13 or fits into the groove 19 formed by the protrusion 14 and the adjacent protrusion 14. I get stuck. When the protrusion 17 of the rotor 16 is engaged with the protrusion 14 of the cam 13, the rotor 16 is in an advanced state, and when the protrusion 17 is fitted in the groove 19, the rotor 16 is Retreating. Here, since the rear end of the middle shaft 2 is in contact with the rotor 16 (the contact portion 20), the core feeding mechanism 4 protrudes from the front end of the shaft tube 1 when the rotor 16 is in the advanced state. When the rotor 16 is in the retracted state, it is in an immersive state.
[0007]
A hollow (hollow part 21) slider 22 is disposed behind the rotor 16 so as to be movable back and forth with respect to the shaft tube 1. A protrusion 23 is also formed on the outer periphery of the slider 22, and a mountain-shaped inclined surface 24 is also formed on the front end surface of the protrusion 23. A guide groove 25 is formed on the side surface of the slider 22 in the vertical direction. In the guide groove 25, an elastic protrusion 27 of a pressing body 26 slidably disposed in the hollow portion 21 is slidably fitted. The elastic projection 27 can be engaged with the top surface 1a of the shaft cylinder 1 to prevent the elastic protrusion 27 from dropping from the rear end of the shaft cylinder 1.
In this example, protrusions 16a and 22a are formed on the surface of the contact surface between the rotor 16 and the slider 22, respectively, and the movement range of the rotor 16 and the slider 22 is restricted. Yes. As will be described later in detail, the slider 22 is also prevented from moving back and forth in the protruding state.
[0008]
Next, an operation for causing the middle shaft 2 to move forward and causing the tip member 7 to protrude from the tip 3 of the shaft tube 1 will be described. From the state of FIG. 1 (FIG. 3), the pressing body 26 and the rear end of the slider 22 are pressed forward with the belly of the finger or the like. By this pressing operation, the rotor 16, the middle shaft 2, the core feeding mechanism 4, and the like move forward against the elastic force of the chuck spring 12 and the retracting spring 8. At this time, the rotor 16 is advanced by the slider 22 and is rotated by the engagement between the angled inclined surface 24 of the slider 22 and the angled inclined surface 18 of the rotor 16. The 16 angled inclined surfaces are locked to the inclined surface 15 of the cam 13 (see FIG. 5), so that the tip member 7 of the middle shaft 2 protrudes from the tip 3 of the shaft tube 1. Here, when the finger is released from the pressing body 26 and the rear end of the slider 22 (when the pressing operation is released), the pressing body 26 is retracted by the elastic force of the chuck spring 12. At this time, since the slider 22 is locked in a state in which the rotor 16 is moved forward, the slider 22 is not retracted, and the pressing body 26 is moved from the rear end of the slider 22. Protruding state.
At this time, the slider 22 is movable between the rotor 16 and the rear end of the shaft tube 1, but the slider 22 and the rotor 16 are provided with a protrusion 16a and a protrusion. Since it is held by a slight engagement force with 22a, it does not move easily.
[0009]
Next, an operation for extending the lead will be described. From the protruding state, the pressing body 26 is pressed with the belly of a finger or the like until the belly of the finger touches the rear end of the slider 22, and the pressing operation is released when the belly of the finger touches. By this pressing operation, the lead tank 9 is pushed forward and the chuck body 10 is also moved forward against the elastic force of the chuck spring 12. Then, the lead is advanced from the tip member 7 as the chuck body 10 advances.
[0010]
Next, an operation for retracting the middle shaft 2 and immersing the tip member 7 in the tip tool 3 of the shaft tube 1 will be described. The pressing body 26 is pressed by the belly of the finger from the protruding state. If this pressing operation is continued, the finger pad will eventually swing to the rear end of the slider 22 as described above. Here, if the pressing operation is further continued, the slider 22 is also pressed, and the rotor 16 is also moved forward and rotated by the pressing / advancing of the slider 22. When the rotor 16 rotates, the engagement between the angled inclined surface 18 of the rotor 16 and the inclined surface 15 of the cam 13 is released, and the protrusion 17 on which the angled inclined surface 18 is formed becomes a groove portion of the cam 13. 19 is located. At this time, the rotor 22 is retracted along the groove 19 by the elastic force of the retracting spring 8, and the tip member 7 is immersed in the tip tool 3.
[0011]
In the lead feeding mechanism 4 of this example, when the shaft cylinder 1 is immersed, the lead tank 9 is relatively pressed, and the chuck body 10 is in the expanded state. At the time of immersion, the lead is always stored (see FIG. 1).
[0012]
FIG. 6 shows a modification of the slider 22 and the pressing body 26 and will be described. This is a modification of the groove of the slider 22 and the protrusion of the pressing body 26. More specifically, a guide groove 29 is formed in the slider 22 from the middle part to the rear end 28 toward the rear, and the side surface of the pressing body 26 is fitted into the guide groove 29. A protrusion 30 is formed. Compared to the previous example, it is easier to process the guide grooves and protrusions, and it can be manufactured at low cost.
[0013]
A second example will be described with reference to FIGS. A pressing rotary body 31 in which the rotor and the slider are integrally formed is in contact with the rear end of the middle shaft 2, and the rear end protrudes from the shaft tube 1. A heart-shaped cam groove 32 is formed on the front surface of the pressing rotator 31. Then, the cam groove 32 is engaged with the engaging projection 33 formed in the rear inner surface of the barrel 1. A guide groove 34 is formed in the rear of the pressing rotary body 31 as in the previous example, and an elastic protrusion 27 of the pressing body 26 is fitted in the guide groove 34.
If the pressing body 26 and the pressing rotator 31 are pressed, the pressing rotator 31 rotates while being advanced by the heart cam mechanism. The tip member of the middle shaft 2 protrudes from the tip of the shaft tube 1 by the advancement of the pressing rotator 31.
[0014]
A third example will be described with reference to FIGS. A slider 35 that does not form an inclined surface of the slider abuts on the rear end of the middle shaft 2, and the rear end protrudes from the shaft tube 1. On the front surface of the slider 35, a wedge-shaped engagement protrusion 36 is formed. The engaging projection 36 protrudes from a slit 37 formed on the side surface of the shaft tube 1 and can be engaged with and disengaged from an engagement receiving portion 39 of a clip 38 fixed to the shaft tube 1. Yes.
When the pressing body 26 and the slider 35 are pressed, the slider 35 moves forward along the slit 37. As the slider 35 advances, the tip member at the tip of the middle shaft 2 protrudes from the tip of the shaft tube 1. Further, the engaging projection 36 of the slider 35 is engaged with the engagement receiving portion 39 of the clip 38, so that the backward movement of the slider 35 and the middle shaft 2 is prevented. Here, when the slider 35 is to be retracted (the middle shaft 2 is immersed), the clip 38 is expanded, and the engagement between the engagement protrusion 36 and the engagement receiving portion 39 is released. By doing so, the slider, the middle shaft, and the like are retracted (immersed) by the elastic force of the retracting spring (not shown).
[0015]
A fourth example will be described with reference to FIGS. This is an example of ease of assembly. As in the previous example of the shaft tube 40, a middle shaft 41 is slidably disposed. Inside the middle shaft 41, a core feeding mechanism 44 including a chuck body 42, a chuck ring 43, and the like is disposed. Reference numeral 45 denotes an elastic member such as a coil spring that urges the central shaft 41 backward.
A lead tank 46 for storing a lead is press-fitted behind the chuck body 42 of the lead feeding mechanism 44, and a claw 47 elastically deformable inward is opposed to the middle rear part of the lead tank 46. It is formed in two places of the position.
On the other hand, a cam surface 51 in which deep groove portions 48, shallow groove portions 49, and protrusions 50 are alternately and continuously formed is formed on the inner surface of the intermediate portion of the shaft tube 40, and the deep groove portions 48 of the cam surface 51 and The shallow groove portion 49 penetrates from the front end to the rear end. Further, an inclined surface 52 is formed on the front end surface of the shallow groove portion 49, and a mountain-shaped inclined surface 53 is formed on the rear end surface.
[0016]
A rotor 54 is rotatably disposed at the front end of the cam surface 51, and the rear end of the middle shaft 41 is in contact with the front end. Further, a vertical protrusion 55 is formed on the peripheral surface of the rotor 54, an inclined surface 56 is formed on the rear end surface of the vertical protrusion 55, and an angled inclined surface 57 is formed on the front end surface. The vertical protrusion 55 slides in the deep groove portion 48, and the inclined surface 56 engages with the inclined surface 52 of the cam surface 51, thereby preventing the rotor 54 from moving back and forth.
[0017]
In addition, longitudinal slits 58 are formed at two opposite positions in the rear portion of the shaft tube 1, and the claws 47 of the core tank 46 are engaged with each other.
A slider 59 that presses and rotates the rotor 54 is disposed behind the shaft tube 40 with its rear end protruding from the rear end of the shaft tube 40. A ridge-shaped inclined surface 60 is formed on the front end peripheral surface of the slider 59, and is rotated when the rotor 54 is pushed forward. In addition, the rear portion of the lead tank 46 is located in the front inside of the slider 59, but the pressing portion 61 that presses the lead tank 46 is located in the rear portion. The pressing portion 61 serves as a holder for holding the eraser 62, but also has a cover 63 for protecting the eraser 62 in a detachable manner. Actually, the eraser cover 63 protrudes from or is immersed in the rear end of the slider 59. Reference numeral 64 is an elastic member stretched between the large diameter portion 46 a of the core tank 46 and the slider 59 that biases the slider 59 forward with a light force.
[0018]
Next, the assembly method will be described with reference to FIGS. In the above example, the core feeding mechanism, the rotor, the slider and the like are assembled from the front end of the shaft cylinder, and then the pressing member is assembled from the rear end of the shaft. However, in this example, first, the middle shaft 41 having the core feeding mechanism 44 is assembled, and in that state, the rotor 54, the elastic member 64, the slider 59, and the pressing member 61 are assembled to the core tank 46. . That is, all the internal mechanisms arranged inside the barrel 40 are assembled in advance. Then, the internal mechanism is inserted from the rear side of the shaft cylinder 40 (see FIG. 13), and at this time, the claw 47 of the core tank 46 is inserted while being narrowed inward (see FIG. 14). Engage with. The assembly is completed by the engagement of the claw 47 with the vertical slit 58 (see FIG. 11). Here, when inserting the internal mechanism into the shaft cylinder, there is a concern that the front end surface of the rotor 54 abuts on the rear end of the cam surface 51 and the insertion is prevented. Since angle-shaped inclined surfaces 53 and 57 are formed on the rear end surface (see FIG. 12), the rotor 52 is positioned while rotating and can be easily inserted without being blocked.
[0019]
【The invention's effect】
The present invention, on the inner surface of the barrel to form a plurality of cam grooves, with arranging the rotor slidably and rotating by the cam groove, the barrel of the slider so as to press-rotating the rotor In the retractable writing instrument arranged in a state of protruding from the rear end , a central shaft having a core feeding mechanism is abutted and disposed in front of the rotor, and the central shaft is always urged rearward by a retractable spring. In addition, the inner surface of the slider is slid to press and rotate the rotor, and the pressing member for operating the core feeding mechanism is disposed so as to protrude from the slider. In addition, the first gist is that the tip member of the middle shaft protrudes from the tip of the shaft cylinder by the advancement of the rotor, and the middle shaft provided with a core feeding mechanism is slidably disposed inside the shaft cylinder. Press the center shaft in the retractable writing instrument With arranging the Ku slider and allowed protruding from the rear of the barrel, and it has constantly urged rearward of the middle axle by retractable spring, slides inside surface of the slider, and, the core feeding mechanism The pressing member for operating the slider is arranged so as to be able to protrude from the slider, while the leading member of the middle shaft is protruded from the tip of the shaft cylinder by the advance of the slider, and the outer shape of the slider is A retractable sharp pencil characterized by being smaller than the outer shape of the cylinder . In addition, since the pressing member for operating the lead feeding mechanism is arranged so as to protrude from the slider, the large knock and the small knock can be used properly with the touch of the finger, so that a good in / out operation, and Can write.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the present invention (when immersed).
FIG. 2 is a main part front view showing the cam of FIG. 1;
3 is a perspective view showing the cam mechanism of FIG. 1. FIG.
4 is an enlarged view of the main part of FIG. 1 (at the time of immersion).
FIG. 5 is an enlarged view of a main part of FIG. 1 (when protruding).
FIG. 6 is a perspective view showing a modification of the cam mechanism.
FIG. 7 is a longitudinal sectional view of an essential part showing a second example.
8 is a perspective view showing the cam mechanism of FIG. 7. FIG.
FIG. 9 is a longitudinal sectional view of an essential part showing a third example.
10 is a perspective view showing the cam mechanism of FIG. 9;
FIG. 11 is a longitudinal sectional view showing a fourth example.
12 is a development view showing the cam mechanism of FIG. 11. FIG.
FIG. 13 is a longitudinal sectional view of an essential part showing an assembling method.
FIG. 14 is a longitudinal sectional view of an essential part showing an assembling method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Medium shaft 3 Tip tool 4 Core feeding mechanism 5 Connecting member 6 Core detent member 7 Tip member 8 Retracting spring 9 Core tank 10 Chuck body 11 Chuck ring 12 Chuck spring 13 Cam 14 Projection 15 Inclined surface 16 Rotor 17 Projection 18 Angle-shaped inclined surface 19 Groove portion 20 Contact portion 21 Hollow portion 22 Slider 23 Projection portion 24 Angle-shaped inclined surface 25 Guide groove 26 Pressing body 27 Elastic projection 28 Rear end 29 Guide groove 30 Projection 31 Pressing rotary body 32 Cam groove 33 Engagement projection 34 Guide groove 35 Slider 36 Engagement projection 37 Slit 38 Clip 39 Engagement receiving portion 40 Shaft cylinder 41 Middle shaft 42 Chuck body 43 Chuck ring 44 Core feed mechanism 45 Rebound member 46 Core tank 47 Claw 48 Deep groove Portion 49 Shallow groove portion 50 Projection 51 Cam surface 52 Inclined surface 53 Angle-shaped inclined surface 54 Rotation 55 vertical projection 56 inclined surface 57 angled inclined surface 58 vertical slit 59 slider 60 Yamagata inclined surface 61 pressing member 62 eraser 63 erases Gomukaba -
64 Elastic member

Claims (3)

A plurality of cam grooves are formed on the inner surface of the shaft cylinder, and a rotor is slidably disposed in the cam grooves, and the slider is pressed from the rear end of the shaft cylinder to press and rotate the rotor. In the retractable writing instrument arranged in a protruding state, the center shaft having a core feeding mechanism is abutted and disposed in front of the rotor, and the center shaft is always urged rearward by a retractable spring, While the inner surface of the slider is slid to press and rotate the rotor, and the pressing member for operating the core feeding mechanism is disposed so as to protrude from the slider, the slider and the rotation A retractable sharp pencil characterized in that the tip member of the middle shaft protrudes from the tip of the shaft tube by the advance of the child . 2. A retractable sharp pencil according to claim 1, wherein the cam groove is formed in a state in which a front end and a rear end thereof are released, and an intermediate shaft having the core feeding mechanism can be engaged with and disengaged from a shaft cylinder. A retractable sharp pencil characterized by being attached. In a retractable writing instrument in which a center shaft is slidably disposed on the inner side of a shaft cylinder, a slider is arranged to protrude from the rear of the shaft cylinder so as to press the center shaft, and the center shaft and that always biased backward by infested spring and slides the inner surface of the slider, and while arranging the pressing member for actuating said lead feeding mechanism so as to be projected from serial slider, the sliding A retractable sharp pencil characterized in that the tip member of the middle shaft protrudes from the tip of the shaft cylinder by the advance of the moving element, and the outer shape of the slider is made smaller than the outer shape of the shaft cylinder .

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