Notebook

Abstract

In a writing instrument having a clip that can be opened and closed by the elastic force of a resilient member, the bending of the resilient member is suppressed. [Solution] The writing instrument 10 includes a clip member 50 that includes a clip 56 and rotates around a rotation axis Ar that extends parallel to and perpendicular to the central axis A1 of the writing instrument, so that the tip of the clip 57 is closest to the barrel 20 and the tip is furthest from the barrel. The clip member 50 also includes a holding member 70 that holds the clip member so that it can rotate around the rotation axis and an elastic member 42 that is disposed inside the barrel and between the clip member and the holding member. The clip member has a receiving surface 60 that receives the elastic force of the elastic member, the extension of the receiving surface passes through the rotation axis, and when the clip member is in the closed position, the receiving surface extends with an inclination toward the rear as it moves away from the rotation axis, and when the clip member is in the open position, the receiving surface extends with an inclination toward the front as it moves away from the rotation axis.

Description

Technical Field

[0001] The present invention relates to a writing instrument.

Background Art

[0002] Conventionally, a writing instrument provided with a clip that can be opened and closed is known. Such a writing instrument has an elastic member such as a coil spring that biases the clip to a closed state. For example, when the user pushes the rear end portion of the clip toward the shaft cylinder, the clip opens, and when the user releases the hand from the clip, the clip closes. In such a writing instrument, since there is a risk of impairing the design if the elastic member is exposed to the outside, a writing instrument in which the elastic member is housed in the shaft cylinder is known. Patent Document 1 discloses an example of such a writing instrument.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the writing instrument disclosed in Patent Document 1, the receiving surface that receives the elastic force of the elastic member in the clip member extends in a direction (lateral direction) orthogonal to the central axis of the elastic member. In such a writing instrument, when the clip member is in an open state, the receiving surface is greatly inclined with respect to the lateral direction. At this time, the rear end portion of the elastic member is pushed by the receiving surface and moves in the lateral direction, and the elastic member can be bent in the lateral direction. In this case, there is a risk that the elastic member cannot appropriately exert the elastic force, and there is also a risk that the elastic member is deformed by repeatedly opening and closing the clip.

[0005] The present invention has been made with these points in mind, and aims to suppress the bending of the elastic member in a writing instrument having a clip that can be opened and closed by the elastic force of the elastic member disposed inside the barrel. [Means for solving the problem]

[0006] The writing instrument of this embodiment is [1] A writing instrument comprising a barrel and a clip, A clip member, including the aforementioned clip, rotates about a rotation axis extending parallel to and perpendicular to the central axis of the writing instrument, thereby taking a closed position in which the tip of the clip is closest to the barrel and an open position in which the tip is furthest from the barrel. A holding member that holds the clip member so that it can rotate around the axis of rotation, It has an elastic member disposed within the shaft cylinder and positioned between the clip member and the holding member, The clip member has a receiving surface that receives the elastic force of the elastic member, The extended surface of the receiving surface passes through the axis of rotation, When the clip member is in the closed position, the receiving surface extends inclined toward the rear as it moves away from the axis of rotation. The writing instrument is such that when the clip member is in the open position, the receiving surface inclins and extends forward as it moves away from the axis of rotation.

[0007] The writing instrument of this embodiment is [2] The writing instrument according to [1], wherein the angle of the receiving surface with respect to the plane perpendicular to the central axis when the clip member is in the closed position is equal to the angle of the receiving surface with respect to the plane when the clip member is in the open position.

[0008] The writing instrument of this embodiment is [3] The writing instrument according to [1] or [2], wherein the pen tip extends and retracts from the front end opening of the barrel as the clip member moves in the axial direction.

[0009] The writing instrument of this embodiment is [4] The clip member and the holding member move integrally in the axial direction, as described in [3].

[0010] The writing instrument of this embodiment is [5] The holding member is a writing instrument according to any one of [1] to [4], having a support portion that supports a part of the clip member when the clip member is in the closed position.

[0011] The writing instrument of this embodiment is [6] The writing instrument according to any one of [1] to [5] further comprises another elastic member that biases the holding member forward. [Effects of the Invention]

[0012] According to the present invention, in a writing instrument having a clip that can be opened and closed by the elastic force of an elastic member disposed inside the barrel, the bending of the elastic member can be suppressed. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a diagram illustrating one embodiment of the present invention, and is a longitudinal cross-sectional view showing an immersive example of a writing instrument with an openable and closable clip. [Figure 2] Figure 2 is a longitudinal cross-sectional view showing the writing instrument from Figure 1 in its protruding state. [Figure 3] Figure 3 is a longitudinal cross-sectional view showing the rear portion of the writing instrument in an immersed and closed state. [Figure 4] Figure 4 is a longitudinal cross-sectional view showing the rear portion of the writing instrument in an immersive and intermediate state. [Figure 5]FIG. 5 is a longitudinal sectional view showing the rear portion of the writing instrument in the immersed state and the open state. [Figure 6] FIG. 6 is an exploded perspective view showing a clip unit including a clip. [Figure 7] FIG. 7 is an exploded perspective view showing the clip unit. [Figure 8] FIG. 8 is a perspective view showing the assembled clip unit.

MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to this specification, for the sake of convenience of illustration and easy understanding, the scale, the vertical and horizontal dimension ratios, etc. are appropriately changed and exaggerated from those of the actual object.

[0015] In addition, with regard to terms used in this specification that specify shapes, geometric conditions, and their degrees, such as terms like "parallel", "orthogonal", "identical", etc., and values of lengths and angles, etc., they are not bound by a strict meaning and shall be interpreted to include a range that can be expected to have a similar function.

[0016] In this specification, the direction in which the central axis A1 of the writing instrument 10 extends (the longitudinal direction, the vertical direction in the longitudinal sectional view) is the axial direction da, the direction orthogonal to the central axis A1 is the radial direction, and the direction along the circumference around the central axis A1 is the circumferential direction. Also, along the axial direction da, the side closer to the writing surface such as a paper surface when writing is the front, and the side separated from the writing surface is the rear. That is, the pen tip side is the front and the side opposite to the pen tip is the rear.

[0017] Figure 1 is a diagram illustrating one embodiment of the present invention, and is a longitudinal cross-sectional view showing an example of a writing instrument 10 equipped with an openable and closable clip 56 in an immersed state. Figure 2 is a longitudinal cross-sectional view showing the writing instrument 10 in an extended state. In this embodiment, an example is described in which the writing instrument 10 is a so-called side-knock type (clip-knock type) ballpoint pen in which the pen tip 14 extends and retracts through the front end opening 20a of the barrel 20 by pressing the clip 56 forward, but the writing instrument 10 of the present invention is not limited to such a writing instrument. The writing instrument 10 may be, for example, a rear-end knock type or a non-knock type ballpoint pen, or other writing instruments such as a fountain pen, mechanical pencil, marking pen, felt pen or touch pen (stylus pen).

[0018] The writing instrument 10 of this embodiment comprises a barrel 20, a refill 12, and a retractable mechanism 30. The barrel 20 includes a front barrel 21, a rear barrel 22 positioned behind the front barrel 21, a tip member 25 positioned in front of the front barrel 21, and a rear end member 26 positioned behind the rear barrel 22. The central axis of the barrel 20 coincides with the central axis A1 of the writing instrument 10. The barrel 20 houses a part of the retractable mechanism 30. The front end of the barrel 20 is provided with a front end opening 20a through which the pen tip 14 of the refill 12 can pass. In this embodiment, the front end opening 20a is formed at the front end of the tip member 25.

[0019] The front barrel 21 is a component having a roughly cylindrical shape and is intended to be held by the user with their fingers when writing with the writing instrument 10. The rear end of the front barrel 21 is attached to the rear barrel 22. For example, the front barrel 21 may be attached to the rear barrel 22 by screwing a male threaded portion formed on the outer circumferential surface of the rear end of the front barrel 21 into a female threaded portion formed on the inner circumferential surface of the front end of the rear barrel 22. The tip member 25 is a component that forms the front end of the writing instrument 10. The tip member 25 has a roughly conical shape, with its diameter decreasing towards the front. The tip member 25 has a front end opening 20a through which the pen tip 14 of the refill 12 can pass. The rear end of the tip member 25 is attached to the front barrel 21. For example, the tip member 25 may be attached to the front barrel 21 by screwing a male threaded portion formed on the outer circumferential surface of the front end of the front barrel 21 into a female threaded portion formed on the inner circumferential surface of the rear end of the tip member 25.

[0020] The rear shaft 22 is a member having a substantially cylindrical shape. The rear shaft 22 includes a groove 23 and a slit 24. The groove 23 is formed on the outer circumferential surface of the rear shaft 22. The groove 23 extends linearly in the axial direction da. The groove 23 accommodates the tip of the projection 58 of the clip 56 of the clip member 50, described later, when the clip 56 is in the closed position. When the clip member 50 moves axially da while the clip 56 remains in the closed position, the tip of the projection 58 moves axially da within the groove 23. The groove 23 may penetrate the wall of the rear shaft 22 in the radial direction. The slit 24 is formed penetrating the wall of the rear shaft 22. The slit 24 extends linearly in the axial direction da and opens rearward at the rear end of the rear shaft 22. The slit 24 accommodates a part of the clip member 50. When the clip member 50 moves axially da, a portion of the clip member 50 moves axially da within the slit 24.

[0021] The rear end member 26 is attached to the rear end of the rear axle 22. The rear end member 26 is a member that closes the rear end of the slit 24 and defines the range of movement of the clip member 50 in the axial direction da. For example, the rear end member 26 may be attached to the rear axle 22 by a projection provided on the outer circumferential surface of the rear end of the rear axle 22 over a projection provided on the inner circumferential surface of the rear end member 26. However, it is not limited to this, and the rear end member 26 may be attached to the rear axle 22 by press-fitting one of the rear axle 22 and the rear end member 26 into the other. Alternatively, the rear end member 26 may be attached to the rear axle 22 by a projection provided on one of the rear axle 22 and the rear end member 26 fitting into a recess provided on the other. Furthermore, the rear end member 26 may be attached to the rear axle 22 by adhesive. The rear end member 26 may completely close the rear end of the rear axle 22. The rear end member 26 has a receiving surface 27 that receives the elastic force of the elastic member 90, which will be described later. The receiving surface 27 is a surface that faces forward.

[0022] The refill 12 is housed in a retractable manner within the barrel 20. The refill 12 may include an ink reservoir for holding ink and a ballpoint pen tip positioned in front of the ink reservoir. The refill 12 has a pen tip 14. The pen tip 14 is the part that forms a mark on a writing surface such as paper. The pen tip 14 may be composed of a part of the ballpoint pen tip. Any ink usable in a ballpoint pen can be used as the ink without particular limitations. For example, the ink may be oil-based ink, water-based ink, gel ink, thermochromic ink, etc. If the ink is thermochromic ink, the writing instrument 10 may have a friction member for rubbing the mark made by the ink and heating the mark by frictional heat. The friction member may be located, for example, at the rear end of the writing instrument 10.

[0023] The retractable mechanism 30 is a mechanism for alternately switching the writing instrument 10 between a protruding state in which the pen tip 14 protrudes from the front end opening 20a of the barrel 20, and a retracted state in which the pen tip 14 retracts from the front end opening 20a. In Figure 1, the writing instrument 10 is shown in the retracted state, and in Figure 2, the writing instrument 10 is shown in the protruding state. In this embodiment, the retractable mechanism 30 includes a rotating cam 32, a resilient member 34, and a clip unit 40.

[0024] The rotating cam 32 has multiple protrusions on its outer circumferential surface that extend in the axial direction da and engage with grooves formed on the inner circumferential surface of the shaft cylinder 20 (rear shaft 22). The rear ends of the protrusions have cam surfaces that are inclined with respect to the axial direction da and the circumferential direction. The front end of the clip unit 40 (holding member 70) has cam teeth 72 that protrude forward (see Figure 6). The cam surface of the rotating cam 32 engages with the cam teeth 72 of the clip unit 40.

[0025] The resilient member 34 is, for example, a coil spring. The resilient member 34 is positioned in a compressed state between a stepped portion provided on the inner circumferential surface of the barrel 20 (tip member 25) and a stepped portion provided on the outer circumferential surface of the refill 12. As a result, the resilient member 34 constantly biases the refill 12 toward the rear relative to the barrel 20.

[0026] In the immersed state shown in Figure 1, the elastic force of the resilient member 34 biases the refill 12 backward, causing the pen tip 14 to retract through the front end opening 20a. When the user pushes and slides the clip 56 forward with their finger, the refill 12 moves forward, and the pen tip 14 protrudes forward from the front end opening 20a, resulting in an extended state. Even when the user releases their finger from the clip 56, the refill 12 maintains its extended state. In the extended state, when the user pushes and slides the clip 56 forward with their finger, the refill 12 moves forward a small distance. When the user releases their finger from the clip 56 or releases the forward pressure on the clip 56, the elastic force of the resilient member 34 biases the refill 12 backward, causing the pen tip 14 to retract through the front end opening 20a, resulting in an immersed state. Since the retraction mechanism 30 that realizes such retraction and retraction operations is well known, a further detailed explanation is omitted. As an example, the same type of emergence mechanism as disclosed in Japanese Patent Publication No. 2012-6315 can be used as the emergence mechanism 30.

[0027] Next, the clip unit 40 of this embodiment will be described. Figure 3 is a longitudinal cross-sectional view showing the rear portion of the writing instrument 10 in the retracted and closed state. Figure 4 is a longitudinal cross-sectional view showing the rear portion of the writing instrument 10 in the retracted and intermediate state. Figure 5 is a longitudinal cross-sectional view showing the rear portion of the writing instrument 10 in the retracted and open state. Figure 6 is an exploded perspective view showing the clip unit 40. Figure 7 is an exploded perspective view showing the clip unit 40. Figure 8 is a perspective view showing the assembled clip unit 40.

[0028] The clip unit 40 of this embodiment includes a clip member 50, a holding member 70, and a resilient member 42. The clip member 50 is configured to rotate about a rotation axis Ar. The rotation axis Ar extends parallel to the direction perpendicular to the central axis A1. In this embodiment, the rotation axis Ar is spaced apart from the central axis A1 and extends parallel to the direction perpendicular to the central axis A1. That is, the rotation axis Ar and the central axis A1 are positioned at a twisted position relative to each other. However, it is not limited to this, and the rotation axis Ar and the central axis A1 may be perpendicular to each other. That is, the rotation axis Ar and the central axis A1 may intersect each other. In this specification, the case where the rotation axis Ar and the central axis A1 are perpendicular to each other is included in the case where the rotation axis Ar extends parallel to the direction perpendicular to the central axis A1.

[0029] The clip member 50 includes a shaft portion 52, a clip 56, and a receiving surface 60. By rotating around the rotation axis Ar, the clip member 50 takes a closed position (see Figure 3) where the tip portion 57 of the clip 56 is closest to the shaft cylinder 20, and an open position (see Figure 5) where the tip portion 57 is furthest from the shaft cylinder 20. The clip member 50 also takes an intermediate position (see Figure 4) between the closed and open positions. The shaft portion 52 protrudes and extends along the rotation axis Ar. The shaft portion 52 has a substantially cylindrical shape with the rotation axis Ar as its central axis. The shaft portion 52 has an inclined surface 54. When the clip member 50 is in the closed position, the inclined surface 54 extends in a direction inclined with respect to the axial direction da and the radial direction so that it moves outward as it moves backward. When the clip member 50 is assembled to the holding member 70, the inclined surface 54 contacts the inclined surface 80 of the holding member 70, which will be described later.

[0030] The clip 56 is positioned on the outside of the shaft 20. The clip 56 is configured to allow other components to be clamped between the clip 56 and the shaft 20 when in the closed position. A projection 58 is formed on the tip 57 of the clip 56. The projection 58 protrudes from the main body of the clip 56 toward the shaft 20. When in the closed position, the tip of the projection 58 is located within the groove 23 of the shaft 20 (rear shaft 22).

[0031] The receiving surface 60 is the surface that receives the elastic force of the resilient member 42. In this embodiment, the receiving surface 60 is a flat surface. The resilient member 42 is, for example, a coil spring. The resilient member 42 extends spirally around a central axis A2. The central axis A2 of the resilient member 42 may extend parallel to the central axis A1 of the writing instrument 10. The resilient member 42 is located inside the barrel 20 and is positioned between the clip member 50 and the retaining member 70. More specifically, the resilient member 42 is positioned in a compressed state between the receiving surface 60 of the clip member 50 and the first receiving surface 84 of the retaining member 70, which will be described later. As a result, the resilient member 42 constantly biases the receiving surface 60 of the clip member 50 away from the first receiving surface 84 of the retaining member 70. In addition, the resilient force of the resilient member 42 constantly biases the clip 56 from the open position to the closed position. Details of the receiving surface 60 will be described later.

[0032] In this embodiment, the clip member 50 further includes a front projection 62, a rear projection 64, and a contact surface 66. The front projection 62 protrudes forward from the main body of the clip member 50. When the clip member 50 is in the open position, the front projection 62 may contact the inner surface of the retaining member 70. The rear projection 64 protrudes rearward from the main body of the clip member 50. When assembling the clip member 50 to the retaining member 70, the worker can insert the clip member 50 between a pair of clamping portions 76 of the retaining member 70, which will be described later, by pushing the rear projection 64 toward the retaining member 70. The contact surface 66 is the portion that contacts and is supported by a support portion 88 of the retaining member 70, which will be described later, when the clip member 50 is in the closed position.

[0033] The holding member 70 is a member that holds the clip member 50 so that it can rotate around the rotation axis Ar. The holding member 70 includes cam teeth 72, a slit 74, a clamping portion 76, an insertion projection 82, a first receiving surface 84, a second receiving surface 86, and a support portion 88. The cam teeth 72 engage with the cam surface of a ridge formed on the outer circumferential surface of the rotating cam 32. When the user pushes and slides the clip 56 forward with their finger, the clip member 50, the holding member 70, and the elastic member 42 move forward together, and the cam teeth 72 contact the cam surface of the rotating cam 32, pressing the rotating cam 32 forward.

[0034] The slit 74 is formed extending from the holding member 70 in the axial direction da and in a direction perpendicular to the axial direction da. A pair of clamping portions 76 are formed on either side of the slit 74. A part of the clip member 50 is placed inside the slit 74. The pair of clamping portions 76 clamp the portion of the clip member 50 that is placed inside the slit 74. The clamping portion 76 has a hole 78 and an inclined surface 80. The hole 78 is a hole into which the shaft portion 52 of the clip member 50 is inserted. The hole 78 has a substantially cylindrical shape with the rotation axis Ar of the clip member 50 as its central axis. In this embodiment, the hole 78 is formed to penetrate the clamping portion 76 from the inside to the outside. Note that the hole 78 only needs to open into the slit 74 and does not need to penetrate the clamping portion 76. The inclined surface 80 is formed behind the hole 78 and facing the slit 74. The inclined surface 80 has the function of guiding the shaft portion 52 toward the hole portion 78 by contacting the inclined surface 54 of the shaft portion 52 of the clip member 50 when the clip member 50 is assembled to the holding member 70. For this reason, the inclined surface 80 extends in a direction inclined with respect to the axial direction da and the radial direction, so as it is directed toward the rear, it is directed toward the outside.

[0035] With the shaft portion 52 of the clip member 50 inserted into the hole portion 78, the clip member 50 is held by the holding member 70 so as to be rotatable around the rotation axis Ar but immovable in the axial direction da. As a result, the clip member 50, the holding member 70, and the elastic member 42 that constitute the clip unit 40 are integrally movable in the axial direction da. In this case, as the clip unit 40 moves in the axial direction da, the pen tip 14 extends and retracts from the front end opening 20a.

[0036] The insertion projection 82 is a projection inserted into the elastic member 42. In other words, the elastic member 42 is positioned outside the insertion projection 82. The first receiving surface 84 is the surface that receives the elastic force of the elastic member 42. In this embodiment, the first receiving surface 84 is a flat surface. As described above, the elastic member 42 is positioned in a compressed state between the first receiving surface 84 and the receiving surface 60 of the clip member 50. The insertion projection 82 extends rearward from the main body of the holding member 70. In particular, in this embodiment, the insertion projection 82 extends parallel to the central axis A1. The central axis of the insertion projection 82 coincides with the central axis A2 of the elastic member 42. The insertion projection 82 may have a substantially frustoconical shape, with its diameter decreasing towards the rear.

[0037] The support portion 88 has the function of supporting the contact surface 66 of the clip member 50 when the clip member 50 is in the closed position.

[0038] In the closed state shown in Figure 3, when the user presses the rear end of the clip 56 toward the shaft cylinder 20, the clip member 50 rotates around the axis of rotation Ar. In the examples shown in Figures 3 to 5, the clip member 50 rotates clockwise. At this time, the receiving surface 60 of the clip member 50 pushes the elastic member 42 toward the holding member 70. As the clip member 50 rotates, it takes the intermediate position shown in Figure 4. When the clip member 50 rotates further and the rear end of the clip 56 contacts the outer circumferential surface of the shaft cylinder 20, the rotation of the clip member 50 stops, and the clip member 50 is in the open position shown in Figure 5. At this time, the forward projection 62 of the clip member 50 may contact the inner surface of the holding member 70.

[0039] In the open position shown in Figure 5, when the user releases the force pressing on the clip 56, the elastic force of the elastic member 42 presses against the receiving surface 60 of the clip member 50, causing the clip member 50 to rotate around the rotation axis Ar. In the examples shown in Figures 3 to 5, the clip member 50 rotates counterclockwise. As the clip member 50 rotates, it returns to the closed position shown in Figure 3, passing through the intermediate position shown in Figure 4. At this time, the contact surface 66 of the clip member 50 is supported by the support portion 88 of the holding member 70, and the rotation of the clip member 50 stops.

[0040] The receiving surface 60 of the clip member 50 will be described in more detail. The extended surface of the receiving surface 60 passes through the axis of rotation Ar. As shown in Figure 3, when the clip member 50 is in the closed position, the receiving surface 60 extends inclined in both the axial direction da and the radial direction so as it moves away from the axis of rotation Ar toward the rear. At this time, the entire receiving surface 60 is located behind the axis of rotation Ar. Also, as shown in Figure 5, when the clip member 50 is in the open position, the receiving surface 60 extends inclined in both the axial direction da and the radial direction so as it moves away from the axis of rotation Ar toward the front. At this time, the entire receiving surface 60 is located in front of the axis of rotation Ar. At a predetermined position in the intermediate position between the closed and open positions, the receiving surface 60 extends in a direction perpendicular to the central axis A1 of the writing instrument 10 (see Figure 4).

[0041] In conventional writing instruments, when the clip is in the closed position, the receiving surface of the clip extends in a direction perpendicular to the central axis of the resilient member (lateral direction). In such writing instruments, when the clip is in the open position, the receiving surface is significantly tilted with respect to the lateral direction. At this time, the rear end of the resilient member is pushed by the receiving surface and moves laterally, causing the resilient member to bend laterally. In this case, the resilient member may not be able to properly exert its resilient force. Furthermore, repeated opening and closing of the clip may cause the resilient member to deform.

[0042] In this embodiment, the extended surface of the receiving surface 60 passes through the rotation axis Ar of the clip member 50. When the clip member 50 is in the closed position, the receiving surface 60 extends with an inclination toward the rear as it moves away from the rotation axis Ar. When the clip member 50 is in the open position, the receiving surface 60 extends with an inclination toward the front as it moves away from the rotation axis Ar. This makes it possible to reduce the angle θ2 (see Figure 5) of the receiving surface 60 with respect to the plane P perpendicular to the central axis A2 of the resilient member 42 when the clip member 50 is in the open position. Therefore, the amount of lateral movement of the resilient member 42 when the clip member 50 is in the open position can be reduced. This makes it possible for the resilient member 42 to exert its resilient force appropriately. In addition, deformation of the resilient member 42 can be suppressed by repeatedly opening and closing the clip 56.

[0043] In particular, in this embodiment, the angle θ1 of the receiving surface 60 with respect to the plane P when the clip member 50 is in the closed position (see Figure 3) is equal to the angle θ2 of the receiving surface 60 with respect to the plane P when the clip member 50 is in the open position (see Figure 5). Note that angles θ1 and θ2 refer to the smaller of the two angles formed between the receiving surface 60 and the plane P. Even when the angle θ1 of the receiving surface 60 is large when the clip member is in the closed position, the receiving surface is significantly tilted with respect to the lateral direction. In this case, the rear end of the resilient member moves laterally, and the resilient member can bend laterally. When angles θ1 and θ2 are equal, the angle θ1 of the receiving surface 60 when the clip member is in the closed position can be reduced while the angle θ2 of the receiving surface 60 when the clip member is in the open position can be reduced. Therefore, the amount of lateral movement of the resilient member 42 can be reduced both when the clip member 50 is in the open position and when the clip member 50 is in the closed position.

[0044] The writing instrument 10 of this embodiment has another resilient member 90 that biases the holding member 70 forward. The resilient member 90 is, for example, a coil spring. The second receiving surface 86 of the holding member 70 is the surface that receives the resilient force of the resilient member 90. The second receiving surface 86 is a flat surface provided at the rear end of the holding member 70. The resilient member 90 is positioned in a compressed state between the second receiving surface 86 and a receiving surface 27 provided on the inner surface of the barrel 20 (rear end member 26). As a result, the resilient member 90 constantly biases the clip unit 40 forward relative to the barrel 20.

[0045] When the writing instrument 10 is in the protruding state shown in Figure 2, the rotating cam 32 is biased backward by the elastic force of the resilient member 34 via the refill 12. The movement of the rotating cam 32 backward is restricted by the multiple protrusions formed on the outer circumferential surface of the rotating cam 32 being pressed against the rear end of the groove formed on the inner circumferential surface of the barrel 20 (rear shaft 22). If the writing instrument 10 does not have the resilient member 90, the clip unit 40 (clip member 50, holding member 70, resilient member 42) can move axially da behind the rotating cam 32 when in the protruding state. In this case, abnormal noise may be generated as the clip unit 40 moves axially da. In this embodiment, the clip unit 40 is always biased forward by the elastic force of the resilient member 90. Therefore, it is possible to suppress the generation of abnormal noise due to the movement of the clip unit 40 axially da when in the protruding state.

[0046] The assembly method of the clip unit 40 of this embodiment will now be described. First, the insertion projection 82 of the retaining member 70 is inserted into the elastic member 42, and the elastic member 42 is assembled to the retaining member 70. Next, the clip member 50 is assembled to the retaining member 70 from the rear. Specifically, the front projection 62 of the clip member 50 is inserted into the slit 74 of the retaining member 70, and the clip member 50 is pressed toward the retaining member 70. At this time, the worker may also press the rear projection 64 of the clip member 50. After that, the inclined surface 54 of the shaft portion 52 of the clip member 50 comes into contact with the inclined surface 80 of the clamping portion 76 of the retaining member 70. When the clip member 50 is pressed further toward the retaining member 70, the pair of clamping portions 76 of the retaining member 70 elastically deform outward. As the clip member 50 moves further forward, the inclined surface 54 of the clip member 50 is guided by the inclined surface 80 of the retaining member 70, and the shaft portion 52 is inserted into the hole portion 78. As a result, the shape of the pair of clamping portions 76 returns to its original state, and a portion of the clip member 50 is clamped by the pair of clamping portions 76.

[0047] The writing instrument 10 of this embodiment comprises a barrel 20 and a clip 56, and includes a clip member 50 that includes the clip 56 and rotates around a rotation axis Ar that extends parallel to the direction perpendicular to the central axis A1 of the writing instrument 10, so that the tip 57 of the clip 56 is closest to the barrel 20 and the tip 57 is furthest from the barrel 20, and a holding member 70 that holds the clip member 50 so that it can rotate around the rotation axis Ar, and is disposed inside the barrel 20, and The clip member 50 has a resilient member 42 positioned between the lip member 50 and the holding member 70, and the clip member 50 has a receiving surface 60 that receives the resilient force of the resilient member 42, the extended surface of the receiving surface 60 passes through the axis of rotation Ar, and when the clip member 50 is in the closed position, the receiving surface 60 extends with an inclination toward the rear as it moves away from the axis of rotation Ar, and when the clip member 50 is in the open position, the receiving surface 60 extends with an inclination toward the front as it moves away from the axis of rotation Ar.

[0048] With this writing instrument 10, the angle θ2 of the receiving surface 60 with respect to the plane P perpendicular to the central axis A2 of the resilient member 42 can be reduced when the clip member 50 is in the open position. Therefore, the amount of lateral movement of the resilient member 42 when the clip member 50 is in the open position can be reduced. This allows the resilient member 42 to exert its resilient force appropriately. In addition, deformation of the resilient member 42 can be suppressed by repeatedly opening and closing the clip 56.

[0049] In the writing instrument 10 of this embodiment, the angle θ1 of the receiving surface 60 with respect to the plane P perpendicular to the central axis A1 when the clip member 50 is in the closed position is equal to the angle θ2 of the receiving surface 60 with respect to the plane P when the clip member 50 is in the open position.

[0050] With this writing instrument 10, the angle θ1 of the receiving surface 60 when the clip member is in the closed position can be reduced, while the angle θ2 of the receiving surface 60 when the clip member is in the open position can be reduced. Therefore, the amount of lateral movement of the resilient member 42 can be reduced both when the clip member 50 is in the open position and when the clip member 50 is in the closed position.

[0051] In the writing instrument 10 of this embodiment, the pen tip 14 extends and retracts from the front end opening 20a of the barrel 20 as the clip member 50 moves axially da.

[0052] With this type of writing instrument 10, the clip member 50 (clip 56) becomes the operating part of the retractable mechanism 30, thus reducing the number of parts in the retractable mechanism 30.

[0053] In the writing instrument 10 of this embodiment, the clip member 50 and the holding member 70 move integrally in the axial direction da.

[0054] With this writing instrument 10, since the clip member 50 and the retaining member 70 are configured as a single clip unit 40, it is possible to prevent the elastic member 42 from coming loose from between the clip member 50 and the retaining member 70. Therefore, stable opening and closing of the clip 56 can be achieved.

[0055] In the writing instrument 10 of this embodiment, the holding member 70 has a support portion 88 that supports a part of the clip member 50 when the clip member 50 is in the closed position.

[0056] With this writing instrument 10, the clip member 50 is supported by the support portion 88 of the holding member 70, so that when the clip member 50 is in the closed position, it is possible to suppress the application of a large force to the tip portion 57 (protruding portion 58) of the clip 56.

[0057] The writing instrument 10 of this embodiment further includes another elastic member 90 that biases the holding member 70 forward.

[0058] With this writing instrument 10, the elastic force of the resilient member 90 constantly biases the clip unit 40 (holding member 70) forward, thus suppressing the generation of abnormal noise due to the axial movement da of the clip unit 40 when it is in the protruding state. [Explanation of Symbols]

[0059] 10 Writing instruments 12 refills 14 nibs 20 shaft cylinder 20a Front end opening 21 Front axle 22 rear axle 23 Groove 24 slits 25 Tip member 26 Rear end member 27 Receiving surface 30 Appearance mechanism 32 Rotation Cam 34 Resilient components 36 Resilient components 40 Clip Units 42 Resilient components 50 Clip components 52 Shaft 54 Slope 56 clips 57 Tip 58 Protrusion 60 receiving surface 62 Forward protrusion 64 Rear protrusion 66 Contact surface 70 Retaining member 72 cam teeth 74 slits 76 Clamping part 78 Hole 80 Slope 82 Insertion projection 84 First receiving surface 86 Second receiving surface 88 Support part A1 Center axis A2 center axis Ar rotation axis P plane

Claims

1. A writing instrument comprising a barrel and a clip, A clip member, including the aforementioned clip, rotates about a rotation axis extending parallel to and perpendicular to the central axis of the writing instrument, thereby taking a closed position in which the tip of the clip is closest to the barrel and an open position in which the tip is furthest from the barrel. A holding member that holds the clip member so that it can rotate around the axis of rotation, It has an elastic member disposed within the shaft cylinder and positioned between the clip member and the holding member, The clip member has a receiving surface that receives the elastic force of the elastic member, The extended surface of the receiving surface passes through the axis of rotation, When the clip member is in the closed position, the receiving surface extends inclined toward the rear as it moves away from the axis of rotation. A writing instrument in which, when the clip member is in the open position, the receiving surface inclins and extends forward as it moves away from the axis of rotation.

2. The writing instrument according to claim 1, wherein the angle of the receiving surface with respect to a plane perpendicular to the central axis when the clip member is in the closed position is equal to the angle of the receiving surface with respect to the plane when the clip member is in the open position.

3. The writing instrument according to claim 1, wherein the pen tip extends and retracts from the front end opening of the barrel as the clip member moves in the axial direction.

4. The writing instrument according to claim 3, wherein the clip member and the holding member move integrally in the axial direction.

5. The writing instrument according to claim 1, wherein the holding member has a support portion that supports a part of the clip member when the clip member is in the closed position.

6. The writing instrument according to claim 1, further comprising another elastic member that biases the holding member forward.

Images