JP3787997B2 - Side knock type writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a side knock type writing instrument that causes a writing article in the shaft tube to appear and disappear by pressing a pressing piece protruding from a side surface of the shaft tube in a radial direction.
[0002]
[Prior art]
As an example, there is JP-A-9-183295 . A side knock type sharp pencil is described as an example. More specifically, a core feeding mechanism is slidably disposed inside the shaft cylinder, and a pressing piece for operating the core feeding mechanism protrudes from a window hole formed on the side surface of the shaft cylinder. It is arranged in the state. Then, by pressing the pressing piece in the radial direction, the lead feeding mechanism is actuated to feed the lead.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, there is a risk that moisture due to dust, sweat, or the like may enter the shaft tube from a gap formed by the inside of the window hole and the outside of the pressing piece. By the way, if dust enters the shaft tube, the core feeding mechanism will not slide smoothly, and if water enters, it will grip and release metal parts such as the core. This would rust the chuck body and spring to be used, and would cause malfunctions.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and is a side knock type writing instrument that causes a writing article in the shaft tube to appear and disappear by pressing a pressing piece protruding from a side surface of the shaft tube in a radial direction. The gist of the invention is that a cylindrical member that covers the pressing piece as well as the shaft cylinder is disposed , and a gap is provided between the pressing piece and the cylindrical member .
[0005]
【Example】
An example of the present invention will be described with reference to FIGS. This is an example applied to a side knock type sharp pencil.
A core feeding mechanism 2 is slidably disposed in front of the shaft cylinder 1. The lead feeding mechanism 2 includes a lead receiving member 3 that separates the lead (written material) L one by one, a slider 5 having an inclined surface 4 formed at the rear end, and a press-fitted lead into the front end of the slider 5. The chuck body 6 for gripping and releasing the chuck body 6, the chuck ring 7 for closing and expanding the chuck body 6, and the like. Reference numeral 8 denotes a core insertion tube that connects the core receiving member 3 and the slider 5, and reference numeral 9 denotes an elastic member such as a coil spring that urges the core feeding mechanism 2 backward.
[0006]
Further, a tip member 11 is detachably fixed to the front end of the shaft tube 1 through a joint member 10 by screwing or the like. A rubber-like core detent member 12 is provided inside the tip member 11.
On the other hand, an eraser 13 and a cap 14 are detachably attached to the rear end of the shaft tube 1 so as to cover the eraser, and a clip member 15 is attached to the side surface.
Note that a core tank portion 16 is provided in the middle of the shaft tube 1 and behind the core receiving member 3.
[0007]
A window hole 17 is formed in a side surface of the shaft tube 1 at a position corresponding to the core feeding mechanism 2, and a pressure with the front end abutting against the inclined surface 4 of the slider 5 is formed in the window hole 17. The pieces 18 are arranged in a protruding state. The pressing piece 18 can be pressed and rotated with respect to the radial direction of the shaft tube 1 with the rear end as a fulcrum.
[0008]
Moreover, a cylindrical grip member 19 is covered on a portion gripped by the shaft cylinder 1, specifically, a portion where the pressing piece 18 is disposed. The grip member 19 is not formed with a uniform thickness, but is formed thin (thin portion 20) in the portion of the pressing piece 18. Further, a gap 21 is formed between the pressing piece 18 and the thin-walled portion 20 to facilitate the assembling of the grip member 19 to the shaft cylinder 1 and unnecessary pressing pieces due to dimensional variations. 18 is prevented (see FIGS. 2 and 3). Further, a gap 22 is formed between the shaft cylinder 1 and the grip member 19 also behind the pressing piece 18. This gap 22 is also intended to facilitate assembly, and when assembled, the contact / friction resistance between the inner surface of the grip member 19 and the surface of the pressing piece 18 protruding from the shaft cylinder 1 is to be minimized.
[0009]
A protrusion 23 is formed in the vertical direction in the vicinity of the pressing piece 18 of the shaft cylinder 1, and a recess 24 is also formed inside the grip member 19 so as to engage with the protrusion 23. . In consideration of prevention of rotation of the grip member 19 with respect to the shaft cylinder 1, the anti-rotation action is also achieved by a configuration in which the pressing member 18 protrudes from the shaft cylinder 1.
FIG. 5 is a reference diagram when the lead feeding operation is performed, and the thin portion 20 of the grip member 19 is deformed in the radial direction by the operation of the finger, and then the pressing piece 18 is pressed in the radial direction. The lead feeding mechanism 2 operates to feed the lead. In this way, when the pressing operation is performed, the finger presses the flexible thin portion 20 (grip member 19), so that the touch is good and the pressing operation can be performed satisfactorily because it does not slide.
There are various materials for the grip member 18, but as an example, silicone rubber, nitrile rubber, acrylic rubber, fluorine rubber, natural rubber, chloroprene rubber, butyl rubber, neoprene rubber, SBR, NBR, elastomer, soft Examples include polyethylene.
In the above example, a sharp pencil has been described. However, a side knock type writing instrument in which a ball-point pen (written material) or the like is slidably accommodated in a shaft cylinder may be used.
[0010]
【The invention's effect】
The present invention is a side-knock type writing instrument that causes a writing article in the shaft cylinder to appear and disappear by pressing a pressing piece protruding from a side surface of the shaft cylinder in a radial direction, and covers the pressing piece together with the shaft cylinder. Since a cylindrical member is arranged and a gap is provided between the pressing piece and the cylindrical member , dust or moisture does not enter the shaft cylinder, especially the operating part, and it can be used as a good writing instrument for a long time. can do.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged sectional view taken along line AA in FIG.
4 is an enlarged sectional view taken along line BB in FIG.
FIG. 5 is a cross-sectional view showing the operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Center feeding mechanism 3 Core receiving member 4 Inclined surface 5 Slider
6 Chuck body 7 Chuck ring 8 Core insertion tube 9 Repellent member 10 Joint member 11 Tip member 12 Core detent member 13 Eraser 14 Cap 15 Clip member 16 Core tank portion 17 Window hole 18 Pressing piece 19 Grip member 20 Thin portion 21 Gap 22 Crevice 23 Protrusion 24 Recessed portion L Core (written material)

Claims (1)

A side-knock type writing instrument that causes a writing article in the shaft cylinder to appear and disappear by pressing a pressing piece protruding from a side surface of the shaft cylinder in a radial direction, and a cylindrical member that covers the pressing piece together with the shaft cylinder A side knock type writing instrument characterized by being arranged and provided with a gap between the pressing piece and the cylindrical member .

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