JPH0528691U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] At the forward position of the clutch, rotate the cap with respect to the tip shaft and select at least one writing pencil, at least one of which is a mechanical pencil writing body, and then emerge from the tip of the leading shaft. Thus, it is possible to provide the compound writing instrument which is capable of feeding the eraser by rotating the cap with respect to the center shaft at the retracted position of the clutch, at low cost and with good usability. [Structure] The main part is a resin molded product, and the front shaft 2 is fixed to the front half of the guide cylinder 1, and the center shaft 4 is rotatably fixed to the rear half of the guide cylinder. Further, a plurality of writing bodies are fitted in the guide groove of the guide cylinder so as to be movable back and forth, and the cylindrical cam 3 is rotatably fixed to the rear end of the guide cylinder and is fixed to the center shaft so as not to rotate. Further, the eraser holder 33 and the eraser 36 are attached to the cylindrical portion behind the cylindrical cam protruding from the rear end of the center shaft.
Is mounted so as to stop rotation and to be movable back and forth, and a cap 29 having a spiral groove 31 formed in a cylindrical portion is rotatably fixed.
Further, the clutch 44 is attached to the inner hole 43 at the tip of the cap only so as to be able to advance and retreat, the cap is prevented from rotating on the center shaft at the forward position of the clutch, and the cap and the center shaft are rotatable at the retracted position.

Description

[Detailed description of the device]

[0001]

[Industrial use field]

 The present invention relates to a compound writing instrument in which the tips of a plurality of writing materials can be alternately retracted and retracted at the tip of the front shaft, and an eraser can be retracted and retracted from the rear end of the cap.

[0002]

[Prior Art]

 Conventionally, as an example of a compound writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 published by the same applicant, it has a sliding groove for guiding two writing instruments and is fixed to a leading shaft. It has a guide barrel and a cam slope that contacts the sliding commas attached to the two cursive bodies fitted to the guide barrel at the front end, and the rear end serves as a knocking portion in the axial direction with respect to the cap. Equipped with a cylindrical cam mounted so that it can move freely and can rotate in the circumferential direction as a unit. By rotating the cap with respect to the tip shaft, two writing instruments can be selectively retracted at the tip end of the tip shaft. There are multiple writing instruments. Further, as a cited example of the present application, as seen in Japanese Utility Model Laid-Open No. 60-120889 by the same applicant, a compound type in which a crown protruding from the rear end of the cap is rotated so that an eraser appears and disappears. Writing instruments exist.

[0003]

[Problems to be solved by the device]

 The above cited example has the first problem that metal parts are used in many parts, the structure is complicated, the number of parts is large, and the cost is high. In addition, since the crown protruding from the rear end of the cap is short, it is difficult to pick it up with a finger, and it is difficult to operate the eraser to move in and out.

[0004]

[Means for Solving the Problems]

 The compound writing instrument of the present invention devised to solve the above-mentioned problems is provided with engaging portions for fitting the resin-made tip shaft and the resin-made guide cylinder tip in a non-rotatable and retaining state. And fixed both. Plural writing bodies with at least one sliding pencil fixed to the rear end in a plurality of guide grooves provided in the guide tube were used as mechanical pencil writing bodies, and they were fitted respectively back and forth via return springs. A cam bevel that displaces in the axial direction is provided in a circular shape at the front end, a flange is provided on the inner surface, and the flange is fitted in the circumferential groove provided at the outer periphery of the rear end of the guide cylinder, and the cylinder is inserted into the guide cylinder. The cam was rotatable and prevented from coming off, and it was fixed. The center shaft is attached to the rear of the guide cylinder so as to cover the guide cylinder and the cylindrical cam, and the guide cylinder is configured to be rotatable with respect to the center shaft so as not to come off. A long cylinder is provided behind the cylindrical cam so that the cylinder protrudes from the rear end of the center shaft, and a slit is provided in the cylinder.The eraser holder with the eraser attached to the rear makes that protrusion in the slit. The cylinder cap of the cylindrical cam is inserted into the cylinder while it is inserted, and the resin cap with the spiral groove in the inner diameter is fitted to the rear end of the center shaft. It is rotatably attached to the part to prevent it from slipping out, and the protrusion of the eraser holder is fitted in the spiral groove. In addition, the clutch is loosely fitted in the inner hole of the cap tip so that it can only move back and forth, the cap and center shaft are stopped at the forward position of the clutch, and the cap is rotated with respect to the tip shaft so that the tip of the writing body is fixed. The cap and center shaft rotate freely at the retracted position of the clutch, and the eraser appears and disappears when the cap is rotated with respect to the center shaft.

[0005]

【Example】

 Embodiments will be described below with reference to the drawings. The compound writing instrument of the present invention includes a guide cylinder 1, a tip shaft 2, a cylindrical cam 3, a center shaft 4, a pair of sliding pieces 5, 5 ', a mechanical pencil writing body 6, a writing body 7 such as a ballpoint pen, a cap 29, and an eraser holder 33. The eraser 36 is the main component. First, as shown in FIG. 1, the guide tube 1 is made of resin and has an axially long guide groove 8 which is open to the side surface from the substantially central portion to the rear end, and the opposite side surface from the central portion to the rear portion. It has an axially long guide groove 8'opened to a position slightly forward of the end. In the front half of the guide cylinder 1, there is provided a cylinder part 9 having a partition part 15 communicating with the guide grooves 8 and 8'and having holes 41 and 41 'and having a front end opened. A flange portion 28 is formed on the outer peripheral portion near the end, and a bulging engagement portion 12 is formed on the outer peripheral portion in front of the flange portion 28. Further, on a side surface slightly rearward of the rear end of the tubular portion 9, there is formed an engaging portion 39 which bulges in a circumferential shape and is fitted with an engaging portion 27 of an inner shaft 4 which will be described later. A circumferential circumferential groove 16 is provided on the side surface of the rear end of the guide cylinder. (Same as the structure of the guide tube portion of Japanese Utility Model Publication No. 64-3491)

The front end of the front shaft 2 is tapered, and the front end of the inner hole is provided with an inner step portion 24. In addition, the rear end hole is provided with an engagement groove 11 that is engaged with an engagement portion 12 provided on the outer peripheral portion of the tubular portion 9 of the guide tube to prevent the guide tube 1 from coming off and rotation. There is. The tubular portion 9 and the tip shaft 2 are detachably fixed with an appropriate force. (Same as the structure of the front shaft in Japanese Utility Model Publication No. 6-43491)

The cylindrical cam 3 is made of resin and has a cylindrical shape. The front end edge of the cylindrical cam 3 has a cam slant surface 13 that is circumferentially displaced forward and backward, and a notch 14 is formed at the frontmost end of the cam slant surface 13. .. The side surface has a groove 38 to be fitted into a rib 37 of a center rod 4 described later, and a fan-shaped brim 17 is provided on the inner surface behind the cam slope 13. Further, a long slit 32 is formed in the cylindrical portion extending long backward.

The center shaft 4 has an engaging portion 27 that is a groove in the circumferential direction on the inner surface of the front end, and a rib 37 that is fitted into the groove 38 of the cylindrical cam 3 is formed on the inner surface of the rear end. The cylindrical cam 3 cannot rotate with the center shaft 4 and can move freely.

The sliding piece 5 has a protrusion 19 on the outer surface, and a central portion projects from the rear end face of the protrusion 19 and both sides of the protrusion 19 have a slope substantially equal to that of the cam slope 13 of the cylindrical cam 3 described above. have. Further, there is provided a hole that abuts on the flange portion 21 of the core pipe 20 and projects and fits behind the core pipe 20 for a long time. Similarly to the sliding piece 5, the sliding piece 5'has a projection 19 'and a cam slope, and an engaging portion 23 for fixing the rear end of the writing body 7 such as a ballpoint pen is provided at the tip. .. The locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted therein.

The cap 29 is made of resin, and has a step portion 42 provided with an inner hole 43 to be fitted on the outer periphery of the rear end of the center shaft 4 at the front side, and a slit window 45 provided at the side wall of the inner hole 43. Further, a clip 30 is provided on the outer peripheral portion of the rear end, and a spiral groove 31 is formed on the inner surface. Further, the eraser rubber holder 33 has a bottomed hole portion for fixing the rear end of the eraser 36 to the rear end, the outer peripheral portion of the tip end of which is fitted into the slit 32 of the cylindrical cam 3 and the spiral of the cap 29. Protrusions 34 that fit into the grooves 31 are provided at appropriate positions.

The mechanical pencil writing body 6 has a built-in general chuck mechanism, is joined to the core pipe 20 via a joint 40 connected to the chuck mechanism at the rear end, and has a flange portion provided at the rear of the core pipe 20. The sliding piece 5 is fitted in contact with the sliding piece 21, and the rear end hole of the core pipe 20 protruding from the rear end of the sliding piece 5 is closed by a tail plug 22 or the like. The lead-out is performed by sliding the chuck by the axial transition of the sliding piece 5 with the tip step portion 25 of the mechanical pencil writing body 6 contacting the inner step portion 24 of the tip shaft 2.

The mechanical pencil writing body 6 and the writing body 7 such as a ballpoint pen are connected to the respective sliding pieces 5, 5 ″ at their rear ends so as to be freely movable in the respective guide grooves 8, 8 ″ of the guide cylinder 1. It is fitted and is urged rearward by the return springs 26, 26 'interposed between the front end faces of the sliding pieces 5, 5'and the guide grooves 8, 8'of the guide cylinder 1 and the partition 15 on the front face. It The cylindrical cam 3 is elastically fitted in the circumferential groove 16 of the guide cylinder 1 so as to be rotatable in the circumferential direction with respect to the guide cylinder 1 so as to be prevented from coming off and fixed. Normally, the circumferential groove 16 and the brim 17 are dimensioned so that the cylindrical cam 3 is prevented from rotating in a state in which each writing body projects from the tip end opening of the tip shaft. Further, in a state in which the mechanical pencil writing body is projected, the circumferential groove position facing the brim 17 is formed wider by the stroke required for feeding the lead. Further, since the sliding pieces 5, 5'are urged rearward by the return springs 26, 26 ', the cam slopes of the projections 19, 19' are always kept in contact with the cam slope 13 of the cylindrical cam 3. ing.

The center cylinder 4 is attached by fitting the guide cylinder 1 and the cylindrical cam 3 so that the rear surface of the flange portion 28 of the guide cylinder 1 is in contact with the front surface of the center shaft 4, and the engagement portion 39 of the center shaft 4 is attached. The guide cylinder 1 is elastically fitted into the engagement groove 27 so that the guide cylinder 1 is rotatable with respect to the center shaft 4, and the rib 37 of the center shaft 4 is fitted into the groove 38 of the cylindrical cam 3 to fit the center shaft 4. The cylindrical cam 3 is not rotatable but has a shaft that can move freely. Further, the front shaft 2 is fitted in the cylinder portion 9 of the guide cylinder 1, the rear end surface of the front shaft 2 is in contact with the front surface of the flange portion 28, and the engagement portion 12 of the cylinder portion 9 is connected to the front shaft 2. The front shaft 2 and the guide cylinder 1 are elastically fitted into the engagement groove 11 so that the front shaft 2 and the guide cylinder 1 are fixed in a rotation-stopping and slip-out preventing state. The front shaft 2 can be attached and detached with an appropriate force. In this state, when the center shaft 4 is rotated to one side with respect to the leading shaft 2, the sliding piece 5 advances and the notch 14 at the foremost end of the cam slope 13 of the cylindrical cam 3 slides on one mechanical pencil writing body 6. The writing tip is locked by the projection 19 of the moving piece 5 so that the writing tip projects from the tip end opening. Further, when the center shaft 4 is rotated to the other side with respect to the leading shaft 2, the sliding piece 5 retracts, the writing tip of the mechanical pencil writing body 6 is retracted from the leading end of the leading axis, and the sliding piece 5 moves forward. Then, the writing tip portion of the writing body 7 such as the other ballpoint pen projects from the tip end tip opening. Further, ribs 49 are provided at a plurality of positions on the rear portion of the center shaft 4, and a mountain-shaped inclined surface is appropriately formed at the rear ends of the ribs. (Not shown)

On the other hand, the eraser holder 33 is elastically fitted on the cylindrical portion of the cylindrical cam 3 that projects long from the rear end of the center shaft 4, and the projection 34 of the eraser holder 33 is provided on the cylindrical portion of the cylindrical cam 3. The eraser holder 33 is fitted in the slit 32 so that the eraser holder 33 can be prevented from rotating and slidable on the cylindrical portion of the cylindrical cam 3. Further, a clutch 44 having a leg portion 46 on the outer surface is loosely fitted in the inner hole 43 of the cap 29 in a state where the leg portion is fitted in the slit window 45 of the cap. A slider 47 is fixed to the leg portion 46 through a slit window 45, and the clutch 44 and the cap 29 are prevented from rotating, but the slider 47 moves the clutch back and forth. In addition, it is desirable that an engaging portion for appropriately positioning the clutch at the front retracted position is formed between the slider and the cut window or between the clutch and the inner hole of the cap. Further, grooves 48 are formed at a plurality of locations on the inner surface of the clutch 44 via ribs. In addition, the front surface of the groove 48 is appropriately opened in an inclined shape.

Further, the cap 29 is elastically fitted by being fitted to the tubular portion of the cylindrical cam 3, and the cap 29 is rotatably attached to the tubular portion so as not to come off, and the projection 34 of the eraser holder 33 is fixed. Fit into the spiral groove 31 of the cap 29. Further, the crown 35 having an opening at the rear end is fixed to the rear end of the tubular portion of the cylindrical cam 3 with the rear end of the cap 29 being substantially in contact with the rear crown of the cap 29, and the eraser rubber 36 is attached to the crown 35. It is inserted through the opening and the rear end of the eraser 36 is fixed to the eraser holder 33. The inner diameter of the opening of the crown 35 is slightly larger than the outer diameter of the eraser 36.

[0016]

[Action]

 First, when the slider 47 is set to the forward position, the rib 49 at the rear end of the center shaft 4 is fitted into the groove 48 of the clutch 44, and the center shaft 4 and the cap 29 are united in the rotational direction, so that the front shaft 2 is disengaged. When the cap 29 is rotated to one side, as shown in FIG. 1, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam 3 engages with the sliding piece 5 of the one mechanical pencil writing body 6 and the writing tip thereof. The part projects from the tip end of the tip shaft. At this time, the flange 17 of the cylindrical cam 3 is located in the wide portion of the circumferential groove 16. In this state, when the rear end of the crown 35 is knocked and the cylindrical cam 3 is axially moved by the stroke of the gap formed between the front end of the brim 17 and the front end of the wide portion of the circumferential groove 16, the movement of the sliding cam occurs. 5, the lead pipe 20, and the mechanical pencil writing body 6 are transmitted, and from the state in which the stepped portion 25 of the writing tip portion abuts the inner stepped portion 24 of the tip shaft 2, the chuck 40 moves axially together with the joint 40 to move the lead. It is paid out. When the cap 29 is rotated to the other side with respect to the tip shaft 2, the mechanical pencil writing body 6 is retracted, and instead, the writing tip portion of the writing body 7 such as a ballpoint pen projects from the tip tip end opening.

Next, when the slider 47 is set to the retracted position, the cap 29 and the center shaft 4 are rotatable, and when the cap 29 is rotated to one side with respect to the center shaft 4, the protrusion 34 of the eraser holder 33 causes the cap 29 to move. Since the eraser holder 33 is gradually moved backward along the spiral groove 31, the eraser 36 is fed out from the opening of the crown 35. Further, when the cap 29 is rotated to the other side, the eraser holder 33 advances and the eraser 36 withdraws from the opening of the crown 35 with it.

[0018]

[Effect of the device]

 As described above, according to the present invention, the guide shaft, the guide cylinder, the center shaft, the cylindrical cam, and the cap are resin-molded products, and the guide cylinder, the engaging portion for the front shaft and the center shaft are integrally provided, and the cylindrical cam is extended integrally. By replacing the metal parts with resin instead of the conventional reference example, by providing a cylindrical part, forming a slit in the cylindrical part, fitting the eraser holder, and fixing the cap with the spiral groove on the cylindrical part This reduces the number of parts. Further, since the assembly is facilitated, the cost can be reduced and the product can be provided at a low cost. Also, by providing a cap on the rear end of the center shaft that can be easily picked up with fingers, it is easy to operate the eraser and it is easy to use.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of an entire main part showing an embodiment of the present invention, showing a state in which a cursive body is selectively retracted from a tip shaft opening.

FIG. 2 is a longitudinal cross-sectional view of an entire main part showing an embodiment of the present invention in a state in which an eraser is projected and retracted from the rear end of the crown.

[Explanation of symbols]

 1 Guide cylinder 2 Tip shaft 3 Cylindrical cam 4 Medium shaft 5 Sliding piece 5'Sliding piece 6 Mechanical pencil writing body 7 Writing material such as ballpoint pen 8 Guide groove 8'Guide groove 9 Cylindrical part 10 Knock spring 11 Engagement groove 12 Engagement Part 13 Cam slope 14 Notch 15 Partition 16 Circumferential groove 17 Collar 18 Through hole 19 Projection 19 'Projection 20 Core pipe 21 Flange section 22 Tail plug 23 Locking section 24 Inner step 25 Step section 26 Return spring 26' Return spring 27 Engagement groove 28 Flange portion 29 Cap 30 Clip 31 Spiral groove 32 Slit 33 Eraser holder 34 Protrusion 35 Crown crown 36 Eraser 37 Rib 38 Groove 39 Engagement portion 40 Joint 41 hole 41 'hole 42 Step portion 43 Inner hole 44 Clutch 45 cut Window 46 Leg 47 Slider 48 Groove 49 Rib

Claims (1)

[Scope of utility model registration request] 1. A plurality of guides provided on the guide cylinder, wherein engaging portions for fitting the resin-made front shaft and the resin-made guide cylinder forward to each other in a non-rotatable and retaining manner are provided to fix the both. A plurality of writing bodies with at least one sliding pencil fixed to the groove at the rear end were used as mechanical pencil writing bodies, and a return spring was urged between the guide tube and the sliding piece to axially move them. A cam sloped surface that is axially displaced is installed in the front end part in a circular shape, and a flange is projected on the inner surface part, and a slit is provided in the cylindrical part that extends further rearward. Insert the resin cylindrical cam into the circumferential groove provided on the outer periphery of the rear end of the guide cylinder, and secure the cylindrical cam to the guide cylinder so that it does not rotate and come off. The protrusion is brought into contact with the slope of the cam. Also, by fitting the rear of the guide cylinder and the cylindrical cam, the resin center shaft is fixed to the guide cylinder,
The guide cylinder is rotatable with respect to the center shaft and is prevented from coming off, and the cylindrical cam is prevented from rotating with respect to the center shaft.
In addition, in the cylindrical portion behind the cylindrical cam protruding from the rear end of the center shaft,
An eraser holder with an eraser attached to the rear is attached by inserting a projection provided on the outer periphery of the eraser holder into the slit of the tubular portion, and a resin cap having a spiral groove on the inner diameter of the outer periphery of the tubular portion The front inner hole is fitted to the rear end of the center shaft, and the inner hole is rotatably fixed in a retaining state, and the protrusion of the eraser holder is fitted in the spiral groove.
In addition, a clutch with a groove formed in the inner periphery through a rib is loosely fitted in the inner hole of the resin cap, and the clutch is slidable by a slider through the cut window of the cap and is prevented from rotating with the cap. A rib that can be fitted into the groove of the clutch is formed at the rear end of the center shaft. As described above, the cap and the center shaft are integrally formed in the rotation direction at the forward position of the clutch, and each sliding piece is alternately moved in the front-rear direction by the rotation of the cap with respect to the front shaft, so that the tip of each cursive body has the tip of the front shaft. It is more selectively retractable and retractable, and when the mechanical pencil is selected, the rear end of the cap is knocked against the center shaft to allow the lead to be extended. Further, the cap and the center shaft are rotatable in the retracted position of the clutch, and the eraser can be retracted from the rear end of the cap by the rotation of the cap with respect to the center shaft.