Cushion-type writing implement

Abstract

To provide a cushion type writing instrument capable of absorbing shock, preventing core breakage, and relieving the burden on hands and fingers when excessive writing pressure is applied to the writing tip.SOLUTION: A taper 7 is fixed to the tip of a barrel 1 storing a writing body, and a grip 17 is fitted to the outer periphery of the barrel 1. The grip 17 is movable in the axial radial direction, and its tip is also movable in the radial direction. A bevel tool 21 is attached to the front of the grip 17, and the bevel tool 21 is provided with a guide surface 22 that guides the tip of the grip 17 in the axial radial direction. A cushion spring 27 is provided between the bevel tool 21 and the taper 7. The grip 17 is movable in the axial length direction and in the axial radial direction against the cushion spring 27.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cushion-type writing implement, such as a mechanical pencil or a ballpoint pen, that can absorb shock when a large writing pressure is applied. [Background technology]

[0002] When excessive pressure is applied to writing instruments such as mechanical pencils and ballpoint pens, the lead can break and the hand and fingers can be strained. For this reason, writing instruments with cushioning properties are known to alleviate excessive writing pressure (see, for example, Patent Documents 1 and 2). The writing instruments described in Patent Documents 1 and 2 have an elastic body interposed between the barrel and a tapered ferrule attached to its tip. When a large amount of pressure is applied, the elastic body allows the ferrule to move with a certain degree of freedom, and impact forces, friction forces, and the like generated between the writing tip and the paper surface are transmitted to the fingers via the elastic body, providing cushioning.

[0003] Like a mechanical pencil, the lead-advancing mechanism that advances the lead from the ferrule is housed within the barrel. However, in the writing instrument described in Patent Document 1, the ferrule is secured to the tip of the lead-advancing mechanism by screwing or the like, while in the writing instrument described in Patent Document 2, the ferrule is secured to a center screw secured to the barrel via an elastic body. In a typical knock-type mechanical pencil, the lead advanced by the lead-advancing mechanism is temporarily held in the advancing position by a temporary lead holder such as elastic rubber provided within the ferrule, and is configured to protrude sequentially from the tip of the ferrule with each knock operation. Therefore, although it depends on the configuration of the lead-advancing mechanism, if an elastic body is provided between the ferrule and the barrel, as in the writing instruments described in Patent Documents 1 and 2, allowing the ferrule to move in the axial direction or radial direction relative to the lead-advancing mechanism or the barrel, the position of the temporary lead holder may deviate from the predetermined position, which could result in a change in the amount of lead advanced. Furthermore, if the nozzle bends in the radial direction of the shaft, the lead being fed out from the lead feeding mechanism will be bent in the radial direction of the shaft, which raises the concern that the lead may break within the mechanism. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 60-78491 (Scope of Utility Model Registration Claims, Figure 2) [Patent Document 2] Japanese Utility Model Application Publication No. 5-41878 (Utility Model Registration Claims, Claim 1, Figures 2 to 10) Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a cushion-type writing implement which exerts a cushioning effect to prevent lead breakage and reduce strain on the fingers, without fear of changing the amount of lead dispensed or causing the risk of lead breakage even when excessive writing pressure is applied to the writing tip in the axial direction or axial diameter direction. [Means for solving the problem]

[0006] According to the present invention, there is provided a cushion-type writing instrument comprising a barrel containing a writing body therein, and a taper fixed to the front end of the barrel having a tip hole through which the tip of the writing body protrudes, a grip fitted onto the outer periphery of the barrel behind the taper so that the grip can move in the axial length direction and the tip in the axial diameter direction, a tubular bevel device having a guide surface that guides the tip of the grip in the axial diameter direction is attached to the barrel between the grip and the taper so that it can move in the axial length direction, a spring receiving portion is formed at the rear of the bevel device and the taper, and a cushion spring is provided between the spring receiving portion to urge the grip rearward via the bevel device, thereby solving the above-mentioned problem.

[0007] In addition, there is provided the cushion-type writing instrument, wherein the grip extends to the middle portion of the barrel or extends over almost the entire barrel. [Effects of the Invention]

[0008] The present invention is configured as described above, and, like a typical writing instrument, has a barrel tube containing a writing body therein, and a taper with a tip hole through which the tip of the writing body protrudes is fixed to the tip of the barrel. A grip is fitted to the outer periphery of the barrel behind the taper so that the grip can move in the axial direction and the tip can move in the axial direction. A tubular bevel device having a guide surface that guides the tip of the grip in the axial direction is attached to the barrel between the grip and the taper so that the bevel device can move in the axial direction. A spring receiving portion is formed at the rear of the bevel device and the taper, and a cushion spring is provided between the spring receiving portion to bias the grip rearward via the bevel device. When writing normally, the user holds the grip while writing, so if excessive writing pressure is applied, the grip moves in the axial direction and / or the tip can move in the axial direction against the cushion spring via the bevel device, absorbing impact and reducing lead breakage and reducing strain on the hand and fingers when writing. In this case, because the taper is fixed to the barrel, even if the writing implement contains a lead-advancing mechanism like a knock-type mechanical pencil, it is the grip attached to the barrel that moves when there is an impact, so the relative positions of the barrel, taper, and lead-advancing mechanism do not change, and the amount of lead advanced can be kept constant.In addition, there is no risk of the lead-advancing mechanism bending in the direction of the shaft diameter, so there is little chance of the lead breaking. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view showing an embodiment of a writing instrument of the present invention. [Figure 2] FIG. [Figure 3] Half cross section of the grip. [Figure 4] Half cross-section of the slope tool. [Figure 5] This shows the case where an impact is applied, (A) is an explanatory diagram when the load acts mainly in the axial direction of the barrel, and (B) is an explanatory diagram when the load acts mainly in the axial diameter direction of the barrel. [Figure 6] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] While the present invention can be applied to various cushion-type writing instruments such as mechanical pencils and ballpoint pens, Figures 1 and 2 show an embodiment applied to a mechanical pencil, with a writing body 2 equipped with a knock-type lead-advancing mechanism housed inside a cylindrical barrel 1. The barrel 1 has a large-diameter rear body 3 and a smaller-diameter front body 5 formed with a step 4 between them, and a taper 7 having a tip hole 6 through which the tip of the lead 8 protrudes is screwed to the tip of the front body 5. As is well known, the lead-advancing mechanism shown in this embodiment has a knock cap 10 and eraser 11 at the rear end of a lead tank 9 that stores the lead 8, and a chuck 12 fixed to the front end, with a clutch 13 fitted into the chuck 12 to open and close the chuck. The lead tank 9 is biased rearward by a knock spring 14, and when the rear end of the lead tank 9 is knocked, the chuck 12 holds the lead 8 and moves forward until the clutch 13 hits a stopper 15 provided within the taper 7. The advanced lead 8 is temporarily held in position by an elastic breaker 16 provided within the taper 7, and repeated knocking causes the lead 8 to gradually protrude forward from the tip hole 6 of the taper 7.

[0011] In the embodiment shown in FIG. 1 etc., a grip 17 is fitted to the outer periphery of the barrel 1 behind the taper 7, in front of the step 4, which is the middle part of the barrel 1. The grip 17 is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the front body 5 of the barrel 1, thereby forming a grip movable space 18 between the barrel 1 and the grip 17, allowing the tip of the grip 17 to move 360 ​​degrees in the axial direction. The grip 17 is movable in the axial length direction of the barrel 1 and can be retracted to a position where its rear end abuts the step 4. A support portion 19 protruding in a curved shape is formed at the rear end of the grip 17, and the tip of the grip 17 can move 360 ​​degrees in the axial direction with the support portion 19 as a fulcrum. A slope abutment portion 20 is formed at the tip of the grip 17, which slopes so that the slope widens toward the tip, and the grip 17 can move forward while abutting against a slope tool 21.

[0012] The bevel tool 21 is formed in a cylindrical shape and is attached to the barrel 1 so as to be movable in the axial direction between the grip 17 and the taper 7, and has a guide surface 22 that guides the tip of the grip 17 in the axial direction. As shown in Figure 4, the bevel tool 21 has a rear opening 23 that can slide against the outer periphery of the front main body 5 of the barrel 1, and a front opening 24 that can slide against the outer periphery of the taper 7. A spring receiving portion 25 is provided inside the bevel tool 21, and a spring receiving portion 26 is formed at the rear of the taper 7, and a cushion spring 27 is inserted between the spring receiving portions 25, 26 to urge the grip 17 rearward via the bevel tool 21.

[0013] In the embodiment shown in the figure, the guide surface 22 of the inclined surface tool 21 is formed as a sloped portion whose slope widens toward the tip so that the inclined surface abutment portion 20 of the clip 17 can abut against it, but any shape or configuration may be used as long as it is capable of guiding the tip of the grip 17 in the axial direction.

[0014] With the above configuration, when holding the grip 17 and writing, as shown in Figure 5 (A), if a large writing pressure acts mainly in the axial direction, the grip 17 moves in the direction of the arrow 29 against the cushion spring 27 while pressing the inclined surface device 21 in the direction of the arrow 28, creating a gap 30 between the grip 17 and the rear main body 3, thereby absorbing the impact.

[0015] 5(B), when a large writing pressure acts mainly in the axial direction, the grip 17 moves in the direction of arrow 32 in the grip movement space 18 against the cushion spring 27 while pressing the bevel tool 21 in the direction of arrow 31, and the tip moves away from the front body 5, absorbing the impact. In reality, the writing pressure acts in a direction that is a combination of the axial length direction and the axial diameter direction, so the cushioning effect shown in the explanatory diagrams of FIGS. 5(A) and 5(B) works in a timely manner.

[0016] In the above embodiment, the grip 17 is provided in the middle of the barrel 1, but it may extend over almost the entire length of the barrel 1 to the rear end of the barrel 1. Figure 6 shows such an embodiment, in which the barrel 1 has a small-diameter front body 5 that extends rearward, a rear step 33 located at the rear of the barrel 1, and the grip 17 extends to a position where it abuts against this rear step 33. As the rest is substantially the same as the above embodiment, detailed description will be omitted. [Explanation of symbols]

[0017] 1 shaft cylinder 3 Rear body 4 steps 5 Front body 7 Taper 17 Grip 18 Grip movement space 19 Support section 20 Slope contact part 21 Slope equipment 22 Guide surface 27 Cushion spring

Claims

1. a barrel housing a writing element therein, the barrel comprising a rear body with a large diameter and a front body with a smaller diameter than the rear body, the front body being located in front of the rear body via a step; a taper having a front end hole through which the front end of the writing body projects and fixed to the front part of the front body; a cylindrical grip having an inner diameter larger than the outer diameter of the front body, surrounding the front body and arranged to be movable in the axial direction of the front body, the grip having a support portion whose rear end protrudes in a curved shape and a front end formed as a sloped abutment portion, and the sloped abutment portion being movable 360 ​​degrees in the axial direction with the support portion supported by the step portion as a fulcrum; a cylindrical inclined surface tool that is disposed in front of the grip and behind the taper, surrounding the front body and movable in the axial direction of the front body, and that has a guide surface formed on an inclined surface part whose inclination increases toward the front end and that guides the inclined surface abutment part of the grip in the axial diameter direction; It is equipped with A cushion spring is provided between the taper-side spring receiving portion formed on the taper and the inclined surface tool-side spring receiving portion formed on the inclined surface tool, and the cushion spring constantly applies a rearward biasing force to the inclined surface tool when the inclined surface contact portion of the grip is in contact with the inclined surface, thereby constantly applying a rearward biasing force to the grip. Cushion-type writing implement.

2. 2. The cushion-type writing implement according to claim 1, wherein the bevel device has a rear opening that can slide against the outer periphery of the front body, and a front opening that can slide against the outer periphery of the taper.

3. A cushion-type writing instrument as described in Claim 1, wherein the grip extends to the middle part of the barrel.

4. A cushion-type writing instrument as described in Claim 1, wherein the grip extends over the entire length of the barrel.

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