JP5001105B2 - Swing-out mechanical pencil - Google Patents

Description

  The present invention relates to a swing-out type mechanical pencil in which a pendulum is moved up and down in a shaft cylinder by swinging the shaft cylinder up and down to advance a core feeding mechanism so that a core is fed out from the tip of the shaft cylinder.

  A mechanical pencil is known that swings the shaft from the tip of the shaft tube by shaking the shaft tube, but the pendulum (weight) provided in the shaft tube moves up and down even while it is being carried. There is an inconvenience. Various proposals have been made to eliminate such drawbacks. For example, a structure that locks a part of the lead feeding mechanism when not in use or a structure that keeps the lead chuck open is known. In such a structure, the pendulum moves up and down during carrying. There is a risk that the pendulum may hit the required parts in the mechanical pencil and cause damage. Therefore, a configuration in which the movement of the pendulum itself is locked is also known (see, for example, Patent Document 1). However, the configuration described in Patent Document 1 is provided with a locking portion (protrusion) on the hammer and a slit that allows the locking portion to reciprocate in the axial direction on the outer cylinder and an engagement portion that can fix the locking portion. (Grooves, holes) are provided, so positioning during assembly is cumbersome, and if the hole is made large so that positioning is easy, the protrusion will be caught in the hole during use and the hammer will be smooth. There was a possibility that it would not move up and down and could interfere with the feeding of the lead.

Further, as a writing instrument such as a mechanical pencil, a writing instrument that can change the position of the center of gravity according to the user's preference is known (for example, see Patent Document 2). However, it was difficult to use.
Japanese Utility Model Publication No. 5-46954 (Scope of request for utility model registration, drawing) Japanese Utility Model Publication No. 5-53991 (FIGS. 1 to 7)

  The problem to be solved by the present invention is to provide a swing-out mechanical pencil that can lock the pendulum when not in use, is easy to assemble, is easy to position, and does not interfere with the vertical movement of the pendulum. It is to be.

  Another object of the present invention is to provide the above-mentioned swing-out type mechanical pencil in which the position of the center of gravity can be easily changed.

  According to the present invention, in a swing-out mechanical pencil in which the pendulum is moved up and down by swinging the shaft cylinder and the core is extended from the tip of the shaft cylinder, the shaft cylinder can be moved in the radial direction corresponding to the stop position of the pendulum. A lock lever having a lock portion is formed, an operation piece movable to a lock position and a release position is provided outside the lock lever, and the lock lever is pressed when the operation piece is moved to the lock position. A pressing protrusion is formed on the inner surface of the operation piece so as to restrain the movement of the pendulum by moving the operation piece inwardly, and the lock is engaged when the operation piece is moved from the lock position to the release position. A swing-out type mechanical pencil characterized in that an engaging portion is formed on the lock lever and the operation piece so as to be lifted in a direction away from the object, thereby solving the above-mentioned problem.

  In addition, according to the present invention, there is provided the above-described swing-out type mechanical pencil in which the pendulum is provided with concave portions that engage with the lock portion at a plurality of positions in the axial direction.

  The present invention is configured as described above, and forms a lock lever having a lock portion that can move in the radial direction of the shaft cylinder corresponding to the stop position of the pendulum. The lock lever and the release position are formed outside the lock lever. A movable operation piece is provided, and when the operation piece is moved to the lock position, the lock lever is pressed and the lock portion is moved inward to form a pressing projection to restrain the movement of the pendulum. During use, the pendulum can be prevented from moving freely by moving the operating piece to the locked position, so that it does not generate a sound and does not give unnecessary impact to the lead feeding mechanism and the like. In addition, since the lock lever and the operation piece are provided with an engagement portion so that the lock is lifted in a direction away from the pendulum when the operation piece is moved from the lock position to the release position, a mechanical pencil is used. In some cases, the lock part can be reliably separated from the pendulum simply by operating the operation piece, and there is no possibility that the lock part will interfere with the movement of the pendulum, and the shaft is swung up and down to smoothly feed the lead. Can do. Further, since the lock lever and the operating piece can be assembled simply by assembling them into the shaft cylinder, it is possible to easily manufacture without requiring troublesome positioning.

  Further, since the recesses are provided at a plurality of positions in the axial direction of the pendulum to engage the lock part, the pendulum stop position can be changed by moving the pendulum and selecting the recess, and the taper member If it is stopped and locked on the side, it becomes a mechanical pencil of the tip center of gravity type, and if it is stopped and locked on the knock member side, a mechanical pencil of the rear end center of gravity type is easily obtained.

  FIG. 1 shows an embodiment of the present invention. A shaft cylinder 1 has a middle main body 3 having a grip 2 and an upper main body 4 connected to the middle main body 3. A taper member 5 is screwed at the tip of the middle main body 3. It is connected by arrival etc. The middle body 3 has a long groove 6 extending in the axial direction and a raised portion 7 extending in the circumferential direction at the rear end as shown in FIGS. 2 to 7. Although not shown in the upper body 4, the long groove 6 There is a protrusion that fits into the raised portion 7 and a recess that engages with the raised portion 7. When the upper main body 4 is mounted from the rear end of the middle main body 3, the inner step portion 8 of the upper main body 4 hits the rear end of the middle main body 3. In the state, the middle main body 3 and the outer main body 4 are connected in a non-rotating state.

  The inside main body 3 is provided with a swing-out type core feeding mechanism. As the lead feeding mechanism, a known appropriate mechanism can be used. The lead feeding mechanism shown in the figure has a lead tank 9 and a chuck guide 10 connected to the tip thereof. A chuck 11 is fixed, and a fastening ring 12 that controls opening and closing is fitted to the chuck 11. The chuck guide 10 includes a receiving flange 13 slidably contacting the inner surface of the middle body 3 and a guide flange 15 slidably contacting a rib 14 formed on the inner surface of the front end of the middle body 3. An impact absorbing spring 17 is mounted between the pendulum (weight) 16 movably inserted and the receiving flange 13. The shock absorbing spring can be made of a metal spring material or a synthetic resin spring material.

  An eraser holder 18 is fitted to the rear end of the core tank 9 so as not to be detached, and an eraser 19 is detachably fitted to the eraser holder 18, and a spring receiver 20 fitted to the rear end of the middle body 3. A knock spring 21 is provided between the two and a knock member is configured. With such a configuration, if the rear end of the eraser 19 is knocked in the axial direction, or if the pendulum 16 is moved up and down by shaking the shaft cylinder 1, the lead tank 9 and the like move forward to pivot the lead as is well known. It can be drawn out from the taper member 5 at the tip of the cylinder and can be written. When not in use, the tip of the core can be accommodated in the tapered member 5 by pushing the core while raising the shaft cylinder 1 and knocking the eraser 19. In this state, the pendulum 16 stops moving and stands by at a stop position as shown in FIG.

  A lock lever 22 is provided corresponding to the stop position of the pendulum 16, and a fitting hole 23 for attaching the lock lever 22 is formed in the inner main body 3. As shown in FIG. 2, the fitting hole 23 is opened in a substantially rectangular shape, and a support piece 24 is formed at a substantially intermediate portion so as to face each other with a space therebetween. The lock lever 22 has a lock portion 25 at the front end, a rear surface rear end is provided with a fitting protrusion 26 that engages with a part of the fitting hole 23, and a rib 27 that extends between the support pieces 24. Is formed. The lock portion 25 has an action projection 28 projecting to the back surface side and an engaging claw 29 projecting to the front surface side. The outer surface of the engaging claw 29 is formed in a substantially arc shape, and an inclined surface 30 is formed on the side surface. ing. The lock lever 22 is fixed to the middle main body 3 and when the upper main body 4 is attached to the middle main body 3, the outer surface on the fitting projection 26 side is covered with the tip of the upper main body 4, and the lock portion 25 is connected to the shaft cylinder. It is provided to be movable in the radial direction. The lock lever 22 may be integrally formed by providing an appropriate cut or the like in the middle main body 3 so that the lock portion 25 can move in the radial direction.

  An operation piece 31 that can be moved to a lock position and a release position is provided outside the lock lever 22. The operation piece 31 can be formed in an appropriate structure. For example, a slide piece slidable in the axial direction of the shaft cylinder may be provided as the operation piece, but in the embodiment shown in the figure, the intermediate flange 32 of the middle main body 3 is provided. A lock ring 33 is rotatably fitted between the front end of the upper body 4 and the lock ring 33 is used as an operation piece 31. On the inner surface of the lock ring 33, when the lock ring 33 is moved to the lock position, the lock portion 25 (engagement claw 29) of the lock lever 22 is pressed to bring the lock portion 25 (working protrusion 28) inward. That is, the pressing protrusion 34 is provided so as to move in a direction in contact with the pendulum 16. Further, when the lock ring 33 is moved from the lock position to the release position, the lock ring 25 is engaged outwardly, that is, away from the pendulum 16 by engaging with the engaging claw 29 formed on the lock portion 25. An engaging claw 36 having an inclined surface 35 that engages with the inclined surface 30 to be pulled up is formed. The engagement claws 29 and 36 formed on the lock portion 25 and the lock ring 33 can be other appropriate engagement portions depending on the shape and structure of the operation piece.

  Between the middle main body 3 of the shaft tube and the operation piece 31, there is provided a stopper means for restricting the movement range of the operation piece 31 when the operation piece 31 moves to the lock position and the release position. The stopper means can be appropriately formed depending on the shape, structure, moving direction, etc. of the operation piece. However, in the embodiment shown in FIG. 1, a guide projection 37 is provided on the inner body 3, and the guide projection 37 enters the lock ring 33. A groove 38 is formed, and blocking walls 39a and 39b are provided at both ends of the guide groove 38, with which the guide protrusion 37 abuts at the lock position and the release position. The guide protrusion 37 may be provided on the lock ring 33 side, and the guide groove 38 may be provided on the middle main body 3 side.

  When the operation piece 31 is moved, it is convenient to be able to confirm that the lock position or the release position has been reached. As such a configuration, for example, in the embodiment shown in FIGS. 11 to 13, the front end of the guide projection 37 of the middle main body 3 is slidably contacted with a small resistance in the guide groove 38 of the lock ring 33. A resistance portion 40 is formed, and the tip of the guide protrusion 37 is separated from the resistance portion 40 at a position where it hits the walls of the both ends 39a and 39b. With this configuration, when the lock ring 33 is rotated, when the resistance is felt in the rotation, the lock ring 33 is not yet in the locked position or the release position, and it can be determined whether the position has moved to any position when the resistance disappears. The display of the lock position and the release position may be appropriately provided on the outer surface of the shaft tube (not shown).

  The pendulum 16 is formed in a cylindrical shape, and a recess 41 is provided in a portion corresponding to the lock portion so that the movement of the pendulum is restrained by the lock portion when the lock portion 25 moves inward. The pendulum movement restraint is such that when the lock part moves inward, the action protrusion 28 of the lock part 25 is pressed against the side surface of the pendulum 16 to suppress the movement of the pendulum. It is also possible to restrict the movement of the pendulum by hitting the both ends of the concave portion 41 in the axial direction with the action projection 28 protruding in the direction. It should be noted that a rough surface may be provided on the surface of the pendulum, or the action protrusion 28 may be simply crimped to the side surface of the pendulum 16 when the lock portion is moved inward without providing a recess (not shown).

  With the above configuration, in the state shown in FIG. 1, the lock ring 33 (operation piece) is in the release position, and the engagement claws 29 and 36 of the lock ring 33 and the lock lever 22 are engaged (FIG. 11). 22 is pulled outward, and the action projection 28 of the lock portion 25 is separated from the side surface of the pendulum 16. Therefore, since the pendulum 16 can move up and down, it can be used by swinging the shaft cylinder 1 and extending the core as usual.

  When the lock ring 33 (operation piece) is moved to the lock position when not in use, the engagement claws 29 and 36 are disengaged during the movement (FIG. 12), and the pressing protrusion 34 hits the upper surface of the lock portion 25. The lock portion 25 is pressed inward (FIG. 13). As a result, the action protrusion 28 enters the recess 41 of the pendulum 16 and the movement of the pendulum 16 is locked, so that the pendulum can be prevented from moving during carrying.

  In the above embodiment, one lock lever and pressing protrusion are provided, but a plurality of positions may be provided in the circumferential direction.

  FIGS. 15 to 17 show an embodiment in which a plurality of concave portions are provided in the axial direction of the pendulum. As shown in FIG. 15, the pendulum 16 is provided with two recesses, a tip recess 42 on the taper member side and an intermediate recess 43 on the knock member side, and the other configurations are basically the same as those in the above embodiment. Therefore, the same reference numerals are given and detailed description is omitted. Then, as shown in FIG. 16, when the pendulum is moved forward and the lock portion is engaged with the intermediate recess 43, the center of gravity of the mechanical pencil becomes the taper member 5 side, and a tip center-of-gravity type writing instrument is obtained. Further, if the pendulum is moved to the knock member side and the lock portion is engaged with the tip recess 42, a writing tool of the rear end center of gravity type is obtained (FIG. 17). If the number of the concave portions is further increased, the position of the center of gravity can be adjusted more delicately.

Sectional drawing which shows one Example in this invention. The top view of an inside main part. FIG. AA line sectional view of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. CC sectional view taken on the line of FIG. The DD sectional view taken on the line of FIG. A is a perspective view, A is a perspective view, B is a plan view, C is a side view, D is a bottom view, and E is a longitudinal sectional view. A lock ring is shown, A is a cross-sectional view, B is a cross-sectional view taken along line AA in FIG. A, C is a side view, and D is a cross-sectional view taken along line BB in FIG. A half sectional view of a pendulum. Explanatory drawing of a use state of a mechanical pencil. Explanatory drawing in the middle of moving an operation piece from a cancellation | release position to a lock position. Explanatory drawing of the operating piece moved to the lock position Sectional drawing of a part of the state which the pendulum locked. The other example of a pendulum is shown, A is a front view, B is sectional drawing. FIG. 16 is a cross-sectional view showing a state in which the pendulum shown in FIG. 15 is locked on the tapered member side. FIG. 16 is a cross-sectional view showing a state where the pendulum shown in FIG. 15 is locked on the knock member side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 3 Medium main body 4 Upper main body 9 Core tank 16 Pendulum 18 Eraser holder 22 Lock lever 25 Lock part 28 Action protrusion 29 Engagement nail 31 Operation piece 33 Lock ring 34 Press protrusion 36 Engagement nail 37 Guide protrusion 38 Guide groove 41 , 42, 43 Pendulum recess

Claims (9)

  In a swing-out mechanical pencil in which the pendulum is moved up and down by swinging the shaft cylinder and the core is drawn out from the tip of the shaft cylinder, a lock lever having a lock portion movable in the radial direction of the shaft cylinder corresponding to the stop position of the pendulum And an operation piece movable to the lock position and the release position is provided outside the lock lever, and when the operation piece is moved to the lock position, the lock lever is pressed to move the lock portion inward. A pressing projection is formed on the inner surface of the operation piece so as to constrain the movement of the pendulum, and the operation piece is engaged when the operation piece is moved from the lock position to the release position, and the lock portion is lifted away from the pendulum. An oscillating mechanical pencil characterized in that an engaging portion is formed on the lock lever and the operation piece.   The swing-out mechanical pencil according to claim 1, wherein the operation piece is rotatably provided on the shaft cylinder.   The swing-out mechanical pencil according to claim 1, wherein the operation piece is provided on the shaft cylinder so as to be movable in the axial direction.   The swing-out mechanical pencil according to claim 1, wherein the engaging portion formed on the lock lever and the operation piece is an engaging claw having an inclined surface inclined in a direction of pulling up the lock portion.   2. The swing-out mechanical pencil according to claim 1, wherein stopper means is provided between the shaft cylinder and the operation piece to restrict a movement range of the operation piece when the operation piece moves to a lock position and a release position.   The stopper means includes a guide groove provided on one member of either the shaft cylinder or the operation piece, and a guide groove provided on the other member and having a blocking wall with which the guide protrusion abuts at both ends. The swing-out mechanical pencil as described.   The swing-out mechanical pencil according to claim 6, wherein a resistance portion is formed in the guide groove so as to give resistance to movement of the operation piece.   The swing-out mechanical pencil according to claim 1, wherein the pendulum is provided with a recess at a position corresponding to the lock portion. The swing-out mechanical pencil according to claim 8, wherein a plurality of the recesses are provided in the axial direction of the pendulum.

Images