JP4933908B2 - Telescopic writing instrument - Google Patents

Description

  The present invention relates to a feeding-type writing instrument such as a mechanical pencil, and more particularly to an extendable writing instrument that can expand and contract the length of a shaft tube.

Stretchable writing instruments are known in which the length of the shaft cylinder is shortened when not in use or carried, and can be extended and used during writing. However, with known writing instruments, when the shaft cylinder is extended from a shortened state, In addition, since it is configured to be operated using a dedicated release button or the like, the configuration becomes complicated and it is difficult to obtain economically (see, for example, Patent Document 1). Further, since the tip of the core remains protruding when the shaft tube is shortened, there is a risk of being caught in a pocket or the like when being carried or damaging fingers or the like.
JP 2001-18578 A (Claim 4, FIG. 3, FIG. 4)

  The problem to be solved by the present invention is that it can be operated using a normal side knock member or the like for extending the core without providing a special release button or the like to release the shortened state of the shaft tube, and the shaft tube has been shortened. It is an object of the present invention to provide a telescopic writing instrument in which the tip of the core can be easily immersed in the shaft tube.

According to the present invention, the side knock member provided on the side surface of the shaft cylinder is pressed so as to be movable in the axial direction, the chuck for gripping the lead is advanced, the lead is fed out, or the side knock member is opened to write the chuck. The side knock type lead feeding mechanism which is retracted to the position and can be written, the front shaft cylinder provided with the side knock type core feeding mechanism inside, and the axial movement behind the front shaft cylinder are fitted. A worn rear shaft cylinder, a spring provided between the front shaft cylinder and the rear shaft cylinder and biasing the rear shaft cylinder rearward, and the rear knock on the side knock member when the rear shaft cylinder is moved forward An engagement portion formed on the side knock member and the rear shaft cylinder so that the shaft tube is engaged, and the engagement portion is disengaged when the side knock member is pressed in the axial radial direction. Is detachably provided so as to move backward to the extended position. Chuck Donokku type core feeding mechanism is telescopic writing instrument characterized in that it is held in a non-writing position in front of the writing position with the engaging portion is engaged is provided, the problems are solved.
In the present invention, the “writing position” means that the chuck is retracted sufficiently and is fastened by a clutch fitted on the outer periphery, and the core is securely gripped so that the tip of the core does not get immersed even when writing. The position of the chuck that is possible is referred to as “non-writing position”. The chuck is positioned in front of the writing position and the clutch is not completely fastened. The position of the chuck that can be retracted.

Since the present invention is configured as described above, when the full length is extended, the chuck is retracted to the writing position, so if the side knock member is pressed, the lead is drawn out as usual and written. that it can be, if when not in use or when carried to move the rear shaft barrel forward, the engagement portion provided on the engaging portion and the rear shaft barrel provided on the side knock member is engaged, the rear portion The total length can be shortened by holding the shaft tube in that state. In use, if the side knock member is pressed as described above, the core can be extended and the rear shaft tube can be disengaged and the rear shaft tube can be moved rearward to increase the total length. ,Easy to use. Thus, according to the present invention, there is no need to provide a special release button or the like, and the side knock member can also be used. Therefore, the configuration is simple, the operation is easy, and it can be obtained economically.

  Further, the chuck of the side knock-type core feeding mechanism is held at the non-writing position in front of the writing position in a state where the side knock member and the engaging portion provided on the rear barrel are engaged (shortened state). Therefore, since the chuck is not fastened by the clutch and the lead is not gripped, the tip of the lead can be pushed into the shaft cylinder, and the tip can be easily retracted during carrying. According to the present invention, when the shaft cylinder is shortened, the chuck piece connected to the chuck is pushed slightly forward by the side knock member so that the chuck does not retract to the writing position, and the chuck is moved to the non-writing position, or the rear shaft cylinder Since the inner cylinder that extends in the axial direction is provided inside the chuck and the chuck piece is prevented from retreating and the chuck is moved to the non-writing position, it can be controlled with a very simple structure. If the knock member is used together to move the chuck to the non-writing position, even if the side knock member sags due to use, the chuck can be reliably prevented from retreating and used for a long time. it can.

  1 to 4 show an embodiment of the telescopic writing instrument of the present invention, and a rear shaft tube (2) is fitted to the rear portion of the front shaft tube (1) so as to be movable in the axial direction. The rear shaft tube (2) is urged rearward by a spring (3) provided between the rear end of the front shaft tube (1) and the inner end of the rear shaft tube (2).

  In the front barrel (1), a side knock type is used in which a lead is fed out by a side knock member provided so as to be movable in the axial direction, or the side knock member is opened to retract the chuck to a writing position. A lead feeding mechanism is provided. As the side knock type core feeding mechanism, various configurations are known, and various modes of mechanisms can be adopted. In the embodiment shown in the figure, a mechanism as described in Japanese Patent No. 3364799 is used. ing. Specifically, the front shaft tube (1) includes a front outer body (5) having a front opening (4) and a front inner body (6) inserted and fixed in the front outer body (5). The outer surface of the front outer body (5) is provided with a grip (7) made of a soft material integrally or separately by two-color molding or the like, and the core is elastically held at the inner tip. A slider (8) is provided so as to be movable in the axial direction. As is well known, a core holding member such as elastic rubber may be fixedly provided at the tip.

  As shown in FIG. 5, the front inner body (6) is formed in an outer shape that can be inserted and fixed in the front outer body in a non-rotating state, and the chuck piece (9) is accommodated therein so as to be movable in the axial direction. The chuck piece is biased backward by the chuck spring (10). A chuck (12) having a clutch (11) fitted on the outer periphery is fixed to the tip of the chuck piece (9), and the chuck piece (9) and the chuck (12) are moved forward to pivot the clutch (11). By moving in the direction, the lead can be extended as is known. The chuck and the chuck piece may be formed integrally. Further, a rib (13) with which the outer periphery of the clutch (11) is slidably contacted with a small diameter portion of the front inner body (6) and a rear end of the clutch (11) when the chuck reaches a writing position. An inner flange (14) is formed to fasten the chuck (12). Instead of the inner flange (14), as is well known, when the flange formed at the front end of the clutch (11) hits the tip of the front inner body, the chuck is fastened to the writing position. May be.

In the illustrated embodiment, the chuck piece (9), such as not to rotate in the previous direction in the main body in front and rear of the chuck piece body (16) having a core inserting hole (15) as shown in FIG. 6 It has a front wall (17) and a rear wall (18) formed in a cross-sectional shape, and the front wall is provided in a substantially L shape so as to form a corner portion. One end of a link claw (19) having a substantially side surface is brought into contact with the corner portion of the front wall (17), and the other end of the link claw (19) is connected to the side knock member (20). The side knock member is pressed in the axial radial direction to advance the chuck piece (9). The link claw (19) may be formed separately from the side knock member (20) so as to abut the end portion.

  As the moving structure of the side knock member (20), for example, a push button protruding on the side surface of the shaft cylinder can be provided so that the whole moves in the axial direction, or other appropriate structures can be used. In the embodiment shown in the figure, a swingable knock lever (21) is provided as a side knock member. As shown in FIG. 7, the knock lever (21) is formed in a shape corresponding to the opening (22) of the front inner body (6), and the base end of the knock lever (21) is the opening (22). An engaging claw (23) is formed at the base end so as to engage with the inner edge of the opening (22) when inserted into the front, so that the front end of the knock lever (21) can be swung forward. It is fixed to the inner body. A small protrusion (24) is provided on the rear rear surface of the base end of the knock lever (21), and the small protrusion (24) is the end of the opening (22) of the front inner body (6). It is fitted to the fitting hole (25) provided at the time of attachment.

  Further, a retaining protrusion (26) is provided below the side surface of the knock lever (21), an operating edge (27) communicating with the link claw (19) is formed at the front end, and a front shaft cylinder is formed on the upper surface. A pressing surface (28) is formed so as to protrude from the outer surface of (1). An engaging portion (29) is provided between the pressing surface (28) and the base end, and the engaging portion (29) has an engaging portion (2) of the rear barrel (2) as described later. 30) engage. The structure of the engaging portion is such that when the knock lever (21) is pressed in the axial radial direction in a state where the overall length of the shaft cylinder is shortened, the engagement is released and the shaft cylinder is extended, and the rear shaft cylinder is extended from the extended state. (2) is formed in an appropriate structure that can be engaged and disengaged so as to be engaged when moving forward to shorten the overall length. In the embodiment shown in the figure, the engaging portion (29) of the knock lever (21) is an engaging claw that inclines so that the front is high and the rear is low as shown in FIG. Although the engaging portion (30) of 2) is an engaging hole, the engaging claw may be provided on the rear shaft tube (2) side and the engaging hole may be provided on the knock lever (21) side. In the present invention, when the engaging portion (29) of the knock lever (21) and the engaging portion (30) of the rear shaft cylinder (2) are engaged as described above, the chuck piece (9) is The chuck lever (21) presses the chuck (12) slightly forward from the writing position so as to be in the non-writing position, and a gap (S) is formed between the rear end of the clutch (11) and the inner flange (14). There is no gripping of the lead (see Fig. 2).

  The rear shaft tube (2) includes a rear outer body (32) (see FIG. 9) having a connection tube (31) at the rear end, and an edge of the connection tube (31) inserted into the rear outer body (32). A rear inner body (34) (see FIG. 10) having an engagement edge (33) that engages with the rear edge. As shown in FIG. 10, the rear inner body (34) is formed with the engagement portion (engagement hole) (30), and is provided with a substantially U-shaped notch (35) to provide a tip (36). A stopper claw (37) having a free end is formed. A convex portion is formed at the tip (36) of the stopper claw (37), and when the rear inner body (34) is inserted into the rear outer body (32), the convex portion is formed on the rear outer body (32). When pressed against the inner surface, the tip (36) elastically protrudes inward of the rear inner body (34). An inner cylinder (38) extending in the axial direction is formed inside the rear inner body (34), an eraser (39) is attached to the rear end, and an eraser cover (40) is attached to the rear outer body (32). ) Is inserted. When the rear cylinder (2) is moved forward, the inner cylinder (38) has its tip abutted against the rear end of the chuck piece (9) to advance the chuck piece (9), and the clutch (11). The rear end is separated from the inner flange (14), and the chuck (12) is formed in such a length that it can be moved to a non-writing position slightly ahead of the writing position.

  A groove (41) on which the tip (36) of the stopper claw (37) slides is formed on the outer surface of the front inner body (6) of the front shaft tube (1), and the rear part of the groove (41) A step portion (42) with which the stopper claw (37) abuts is formed (see FIG. 11). A guide groove (43) is provided behind the groove (41), and the inner surface of the rear inner body (34) of the rear shaft tube (2) can slide in the guide groove (43). A guide projection (44) is provided so as to engage with the guide projection.

  With the above configuration, when the rear shaft cylinder (2) is moved forward, as shown in FIG. 2, the engaging portion (30) of the rear shaft tube is moved to the engaging portion (29) of the knock lever (21). Engage and the rear barrel (2) is held in the forward position and its overall length is shortened (FIG. 1). In this state, the knock lever (side knock member) presses the chuck to the non-writing position slightly ahead of the writing position, and the chuck is also caused by the inner cylinder (38) of the rear shaft cylinder (2). Since the lead has been moved to the non-writing position slightly ahead of the writing position and the lead is not gripped, the tip of the lead and the slider (8) can be easily pushed into the shaft tube.

In use, when the knock lever (21) is pressed in the axial direction, the engagement portions (29) and (30) are disengaged, and the rear shaft cylinder (2) is retracted by the spring (3), The entire length is extended (FIGS. 3 and 4). As shown in FIG. 11, the extended position is regulated by the stopper claw (37) and the step portion (42). Further, when the shaft cylinder is extended, the knock lever (21) allows the chuck piece (9) to move backward, and the inner cylinder (38) releases the pressure of the chuck piece (9). Can be retracted to the writing position. Therefore, if the knock lever (21) is knocked, the lead is fed out from the front end of the front barrel (1), and if the knock is stopped, the chuck is retracted to the writing position and the rear end of the clutch (11) is sufficiently fastened to the chuck against the inner flange (14), core do not retract, can be written. When the total length is shortened again, the rear barrel (2) may be moved forward as described above.

The top view of the state which showed one Example of this invention and shortened the full length. Sectional drawing of FIG. The front view of the state which extended the full length. Sectional view of FIG. The front inner body of a front axial cylinder is shown, (A) is a top view, (B) is a front view, (C) is a sectional view, (D) is a left side view, and (E) is a right side view. The chuck | zipper piece is shown, (A) is a top view, (B) front view, (C) is sectional drawing, (D) is a right view, (E) is the EE sectional view taken on the line of (B). A knock lever is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, and (D) is a sectional view. Explanatory drawing which shows the engagement state of the engaging part of a knock lever and a rear axial cylinder. The rear outer main body of a rear axial cylinder is shown, (A is a top view, (B) is a front view, (C) is a sectional view, (D) is a sectional view taken along the line DD in FIG. (C). The rear inner body of the rear barrel is shown, (A) is a plan view, (B) is a front view, (C) is a cross-sectional view, and below, (C) shows a cross-sectional view, and (D) is a DD line. Sectional drawing, (E) is a sectional view taken along line EE, (F) is a sectional view taken along line FF, and (G) is a sectional view taken along line GG. Explanatory drawing which shows the relationship between the groove | channel of the front inner main body of a front axial cylinder, and the stopper nail | claw of a rear axial cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front shaft cylinder 2 Rear shaft cylinder 5 Front outer main body 6 Front inner main body 20 Side knock member 21 Knock lever 29 Engagement part 30 Engagement part 32 Rear outer main body 34 Rear inner main body 37 Stopper claw

Claims (5)

  Press the side knock member provided on the side surface of the shaft cylinder so as to be movable in the axial diameter direction to advance the chuck that grips the core, and extend the core or release the side knock member to retract the chuck to the writing position. A side knock type core feeding mechanism made possible; a front shaft cylinder provided with the side knock type core feeding mechanism; and a rear shaft cylinder fitted to the rear of the front shaft cylinder so as to be movable in the axial direction; A spring provided between the front shaft cylinder and the rear shaft cylinder and biasing the rear shaft cylinder rearward, and the rear shaft cylinder engages with the side knock member when the rear shaft cylinder is moved forward. The side knock member and an engagement portion formed on the rear shaft cylinder are provided, and the engagement portion is disengaged when the side knock member is pressed in the axial radial direction, and the rear shaft tube is moved backward to the extended position. The side knock type lead is provided so that it can be moved and disengaged. Structure chucks telescopic writing instrument characterized in that it is held in a non-writing position in front of the writing position with the engaging portion is engaged.   The side knock member is a knock lever having one end pivotably fixed to the front shaft cylinder, and the engagement portion is an engagement claw projecting from the knock lever and an engagement hole formed in the rear shaft cylinder. The telescopic writing instrument according to claim 1.   The telescopic writing instrument according to claim 1, wherein a step portion is provided on an outer surface of the front shaft tube, and a stopper claw is provided on the rear shaft tube so as to come into contact with the step portion when the rear shaft tube is retracted to the extended position.   The chuck of the side knock type core feeding mechanism is provided at the tip of the chuck piece, the side knock member is connected to move the chuck piece in the axial direction, and the engagement portion of the side knock member and the rear shaft cylinder is engaged. The retractable writing instrument according to claim 1, wherein the side knock member presses the chuck piece so that the chuck is positioned at a non-writing position.   The rear shaft cylinder has an inner cylinder extending in the axial direction, and when the rear shaft cylinder is moved forward, the inner cylinder hits the chuck or a chuck piece to move the chuck to a non-writing position. The telescopic writing instrument according to claim 1 or 4.

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