JP2574075Y2 - Waterproof knock mechanical pencil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof knock mechanical pencil in which water cannot penetrate.

[0002]

2. Description of the Related Art Knock-type mechanical pencils are designed to perform writing by projecting the core from the writing tip or to advance the knob by advancing the knob. When the conventional knock-type mechanical pencil is immersed in water, the writing tip is sharpened. Or, the structure was such that water entered the shaft cylinder from the gap between the shaft cylinder and the knob.

[0003]

Therefore, if the above-mentioned items are used in the rain or are washed by mistake while attached to clothes, water enters into the shaft cylinder and the mechanism is rusted. At the same time, the core powder washed away by water may adhere to the inside of the mechanism and cause poor centering. The present invention provides a waterproof knock mechanical pencil that solves the above-mentioned problems.

[0004]

According to the present invention, a barrel is formed of a material through which water cannot penetrate, and a core holder is incorporated in a base provided at a front portion of the barrel. The lead holder frictionally holds the lead without any gap. In addition, the rear end opening of the shaft cylinder is sealed with a cap formed of an elastic body. Therefore, even if it is immersed in water, there is no possibility that water will enter the shaft cylinder. Further, in order to draw out the lead, the cap is pressed and elastically deformed to advance the chuck and the lead tank.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1. A front barrel 1 and a rear barrel 2 are formed of a material through which water cannot penetrate, and the front barrel 1 and the rear barrel 2 are screwed together. Thus, the O-ring 3 made of rubber is sandwiched to form a shaft cylinder. The mechanical part of the conventional knock type mechanical pencil is constituted by the chuck 4, the tightening ring 5, the core tank 6, the connecting tool 7, etc., and the mechanism is built in the barrel, and the connecting tool 7 is connected to the front end of the front barrel 1. More protruding.
A base 8 is screwed into the connecting tool 7, and a rubber O-ring 9 fitted into the concave groove 7 </ b> A of the connecting tool 7 is tightly held by the inner step 8 </ b> A of the base 8 and the front end of the front barrel 1. Further, a rubber core holder 10 is built in the base 8, and the core holder 10 is provided.
Thereby, the core 11 is frictionally held without any gap. An eraser 12 is provided at the rear of the core tank 6, and a knob 13 that covers the eraser 12 is fitted to the core tank 6. A fixing member 14 is screwed into the rear part of the rear barrel 2, and is made of an elastic body such as rubber in which a front inner flange 15 </ b> A is tightly held by the outer flange 14 </ b> A of the fixing member 14 and the rear end of the rear barrel 2. Rear barrel 2 with cap 15
Seal the rear end opening.

Therefore, when the lead 11 is extended, the cap 15 is pressed to be elastically deformed, and the elastically deformed cap 15 pushes the knob 13 to advance the chuck 4 and the lead tank 6 to move the lead 11. Roll out. When storing the spare core 11 in the core tank 6, the cap 15 is rotated to remove the fixture 14 from the rear barrel 2, and then the knob 13 and the eraser 12 are removed to remove the spare core 11. To store.

In the above embodiment, the barrel is constituted by a front barrel and a rear barrel. However, even if the barrel is constituted by one part, the object and effect of the present invention can of course be obtained. Further, it is also possible to constitute the shaft cylinder and the base with one part.

[0008]

As described above, according to the present invention, the core holder incorporated in the base frictionally holds the core without any gap, and the rear end opening of the shaft cylinder is sealed by the cap formed of the elastic body. It is characterized by the following. Therefore, even if it is used in the rain or accidentally put into the washing machine, water does not enter the shaft cylinder, the mechanism part rusts, and the core powder washed away by water adheres to the mechanism part, and There is no danger of poor delivery.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a waterproof knock mechanical pencil according to the present invention.

[Explanation of symbols]

 4 chuck 6 core tank 8 base 10 core holder 11 core 15 cap

Claims (1)

(57) [Scope of request for utility model registration] 1. A knock-type mechanical pencil that sequentially feeds a lead by advancing a chuck interlocked with a lead tank, wherein the barrel is formed of a material that does not allow water to penetrate therethrough, and a die provided at a front part of the barrel is provided. A wick holder is built-in, the wick holder frictionally holds the wick without gaps, and the rear end opening of the shaft cylinder is sealed with a cap made of an elastic body. A waterproof knock mechanical pencil characterized by moving forward.