JPH049194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a single-knock writing instrument that is comparable to those having refills that use water-based ink.

[Prior art and its problems]

With a single-knock type writing instrument, when you press the knock button that protrudes from the rear end of the barrel, the pen body protrudes from the tip of the barrel and you can write.For example, when you press the release button that protrudes from the side wall of the barrel, the pen body moves into the barrel. It's immersive. There are various types of refills used for this single-knot writing instrument.
Recently, many ballpoint pens have refills using water-based ink. Ballpoint pen refills with water-based ink have a low viscosity, so if you put the pen in your pocket with the pen protruding from the tip of the barrel, you may stain your clothes with the ink, so be careful not to close the cap. For those without this, the pen body must be recessed into the barrel when not writing, and single-knock writing instruments are often used.

In this single-knock type writing instrument, the release button that protrudes from the side wall of the barrel has a built-in spring to provide the release button with restoring force, making the structure complex and requiring a large space. Therefore, the refill must be stored in front of the position where the release button is located, and on the other hand, since the overall length of the writing instrument is approximately constant, it is necessary to shorten the length of the refill. Therefore, there is a problem that the built-in amount of water-based ink is reduced, and the writable distance is shortened.

[Purpose of invention]

Therefore, an object of the present invention is to provide a single-knock writing instrument that has a small number of parts, a simple structure, can use a long refill, and has a long writing distance.

[Structure of the idea]

The single-knock writing instrument of the present invention has a barrel with a long hole bored in the side wall, a refill housed inside the barrel while being biased backward by a spring, and two slits in the axial direction. It is fixed between a metal receiver that is formed and moves forward by a notch operation after receiving the rear end of the refill, and both slits of this receiver,
It includes a locking member that moves back and forth in a long hole in the shaft cylinder, and a clip having a locking step at the tip. When the receiver moves forward by a knob operation, the locking member engages with the locking step of the clip. When the tip of the clip is expanded and moved away from the barrel surface, the engagement between the locking member and the locking step is released, the reflex retracts, and the pen body sinks into the barrel. It is characterized by:

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

A tip 2 is screwed onto the tip of the barrel 1, and a clip 3 is fixed near the rear end. A mounting portion 31 of the clip 3 is bent into a box shape and inserted into the barrel 1, and a curved leaf spring 32 is fitted into the mounting portion 31 to prevent the clip 3 from falling out. Therefore, the pressure contact portion 33 at the tip of the clip 3 is biased by the action of the leaf spring 32 so as to come into pressure contact with the surface of the shaft cylinder 1. A downward locking stepped portion 34 is formed in this pressure contact portion 33, and a long hole 11 is bored in a portion of the shaft cylinder 1 that corresponds to the pressure contact portion 33. A water-based ballpoint pen refill 4 is accommodated in the barrel 1, and this refill 4 is biased rearward by a knock spring 42. The rear end of the reflex reel 4 is inserted into the receiving tube 5.

The receiver tube 5 is a metal cylinder with a bottom, and as shown in FIG. 3, a rectangular hole 51 is bored in the upper surface thereof, and two slits 5 are formed in the axial direction of the circumferential surface.
2 and 52 are formed in parallel. Therefore, the space between the two slits 52 is highly elastic and bends considerably due to a force in the diametrical direction, but a through hole 53 for attaching the locking member 6 is formed in this portion. and,
The width of the lower side of the through hole 53 is narrower. On the other hand, as shown in FIG. 4, the locking member 6 is injection molded from synthetic resin, and has a projection 61 having a tapered portion 63 on one side and grooves 62 carved on both sides. This groove 6
2 is fitted into the narrow edge 54 of the lower side of the through hole 53 and is fixed to the receiving cylinder 5. Locking member 6
When assembling the receiving tube 5 to which is fixed into the shaft tube 1, the locking member 6 is pressed and inserted into the shaft tube 1 with the space between both slits 52 being bent. When the locking member 6 is fitted into the elongated hole 11, both slits 52
The gap returns to its original state and the protrusion 61 protrudes from the elongated hole 11.

A first knock rod 71 is connected to the rear end of the receiving tube 5, and a rectangular portion 71a is formed at the tip of the first knocking rod 71 via a shaft whose length is equal to the plate thickness of the receiving tube 5. This rectangular portion 71a is fitted into the rectangular hole 51 of the receiving tube 5, rotated 90 degrees, and fixed. Therefore, the phase between the receiving tube 5 and the first knob rod 71 is always constant. Furthermore, the second notch bar 7 is attached to the first notch bar 71.
2 are connected, but both of the knob bars 71 and 72 are partially semicircular in order to secure space for attaching the clip 3, and have a cross-sectional shape other than circular in order to match the phase. The irregularly shaped protrusion 72a is press-fitted into the corresponding irregularly shaped hole 71b. The rear end of the second knob rod 72 is covered with a knob cover 8.

When writing, the locking member 6 moves forward when the knock cover 8 is pressed and the knock operation is performed from the state shown in FIG. As shown in FIG. 3, the protrusion 61 engages with the locking step 34.
At this time, the pen body 41 protrudes from the tip opening of the nib 2 and becomes ready for writing.

Next, to retract the pen body 41, press and rotate the pressing part 35 at the rear end of the clip 3 with your fingertip, and push the pressure contact part 33 at the tip away from the surface of the barrel 1 against the biasing force of the leaf spring 32. All you have to do is space them apart. As a result, the engagement between the protrusion 61 and the locking step 34 is released, and the refill 4 is retracted by the biasing force of the knock spring 42, so that the protrusion 61 is aligned with the elongated hole 11 as shown in FIG.
While engaging with the rear edge of the pen body 41, the pen body 41 is retracted into the tip 2. Furthermore, if the pen body 41 is placed in a pocket in the protruding state shown in FIG. Therefore, the result is the same as when the pressure contact part 33 is separated from the surface of the shaft cylinder 1, and the engagement between the projection part 61 and the locking step part 34 is released. Therefore, when the pen body 41 is worn in a pocket, the pen body 41 always sinks into the nib 2, and there is no risk of staining clothes with ink.

In this way, since the locking member 6 is fixed to the highly elastic part between both slits 52 of the receiving tube 5,
No need for a restoring spring behind the locking member 6,
The number of parts is small and the structure is simple. and,
Since a space can be secured behind this locking member 6, the refill 4 can be accommodated in this space, and the total length of the refill 4 can be increased.
It is possible to use a writing instrument with a long writing distance.
Furthermore, since the locking member 6 is fixed to the inside of the receiving tube 5 without protruding almost, the locking member 6 does not interfere with the insertion of the refill 4 into the receiving tube 5. Furthermore, since the locking member 6 has a thin plate shape except for the protrusion 61 projecting from the elongated hole 11, it requires less space and can be made into a slender writing instrument.

[Effect of idea]

As explained above, in the single-knock writing instrument of the present invention, the locking member is fixed to the highly elastic part between the two slits of the receiver, and the area between the two slits is usually placed behind the locking member. The structure is simple, with a small number of parts, and a long refill can be used, making it possible to create a single-knock writing instrument with a long writing distance. be.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the embodiment of the present invention;
The figure is a perspective view of the receiving cylinder, and FIG. 4 is a perspective view of the locking member. 1... shaft cylinder, 11... long hole, 2... tip, 3...
... Clip, 33 ... Pressure contact part, 34 ... Locking step part, 4 ... Refeal, 41 ... Pen body, 42 ...
...Knot spring, 5... Receiver, 52... Slit,
6...Locking member, 61...Protrusion, 8...Knob cover.

Claims (1)

[Scope of utility model registration request] A shaft cylinder with a long hole bored in the side wall, a refil housed in the shaft cylinder in a state where it is biased backward by a spring, and two slits are formed in the axial direction.
A metal receiver that receives the rear end of the refill and moves forward by a knock operation, a locking member that is fixed between both slits of the receiver and moves back and forth within the elongated hole, and a locking step at the tip. When the receiver moves forward by a knock operation, the locking member engages with the locking step to enable writing, and when the tip of the clip is expanded and separated from the barrel surface, the locking member A single-knock type writing instrument characterized in that the engagement between the locking member and the locking stepped portion is released, the reflex retracts, and the pen body is retracted into the barrel.