JPH0443350Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention uses the elastic force of a coil spring to bounce a writing body housed in a flat barrel toward the opening at the rear end of the barrel. The present invention relates to an improvement in a flat writing instrument in which the end of the writing brush is exposed from the opening at the tip of the barrel by the pressing action of a flat pushing member protruding from the opening at the rear end of the barrel.

``Prior art and problems to be solved by the present invention'' The existence of writing instruments that use a flat barrel has been widely known, but this flat writing instrument also has many problems such as portability, appearance, etc. From this point of view, it is required to have a thickness as thin as possible and a width as small as possible. The writing body housed in this flat barrel is moved by the pressing action of a pushing member protruding from the opening at the rear end of the barrel, and the writing tip is pushed against the elastic force of the coil spring. In many cases, the coil spring installed in the barrel is exposed from the opening at the tip of the barrel, and in order to make the barrel as thin as possible, it is necessary to , their positional relationships,
Various considerations need to be made in terms of size. In other words, it is necessary to take care to avoid polymerization in a way that wraps around the writing body as much as possible in terms of positional relationship, and to keep the diameter as small as possible than the diameter of the writing body.

A possible mounting structure that takes into account the diameter of the coil spring installed in the barrel and its placement position is one in which the coil spring is housed parallel to and parallel to the writing body, but in this case,
Although it contributes to making the flat shaft cylinder thinner, it is insufficient in terms of making the shaft cylinder width smaller, and the related structure becomes complicated, including the formation of the space for housing the coil spring. There is a problem.

In the end, the current situation is that no concrete means have yet emerged to simultaneously satisfy the requirements for thin walls and small widths.

"Means for Solving the Problem" The present invention has been made in view of the state of the prior art, and is a method for moving a writing body housed in a flat shaft cylinder via a writing body coupling part to a coil spring. A through hole opening perpendicular to the axis of the pressing member is provided in the flat pushing member that presses against the applied force, and a hole is formed in the through hole that is linearly connected to the cursive joint part. A locking protrusion with which one end of the coil spring engages is provided at a position facing the cursor, and the other end of the coil spring on the side of the writing body is brought into contact with a hook step provided in the shaft cylinder. is used as a means to solve problems.

"Operation" As described above, the present invention uses an appropriate pushing member engagement/disengagement mechanism to push one end of the coil spring into the through hole of the pushing member that presses the writing instrument at a position opposite to the joint where the writing instrument is coupled. In addition to providing a locking protrusion that engages with the handle, the other end of the coil spring on the writing side is brought into contact with the hook step in the shaft cylinder, so that the push member cannot be pressed. Therefore, at a position separated from the writing body, the writing body is moved toward the tip of the barrel while contracting the coil spring arranged in series with the writing body within the through hole, and the end of the brush is then inserted into the opening at the tip of the barrel. It will be exposed from the outside. As a result, the existence of the coil spring as a resilient member is not restricted by the diameter of the writing body, and it is possible to easily realize a flat writing instrument with a thin barrel and an extremely small width. It turns out.

"Example" Hereinafter, an example of the present invention will be described based on the drawings.

A pushing member 2 protruding from a rear end opening 1b is accommodated in the flat barrel 1, and this pushing member 2 has a connecting part 2a with a writing body W at its tip. The rear end portion has a large diameter portion 2b for a notch and is formed into a flat shape. The pushing member 2 is provided with a through hole 3 that opens perpendicularly to its axial direction, and a coil spring 4 is mounted within the through hole 3. The coil spring 4 has a locking protrusion 2c that has one end located in the through hole 3 at a position linearly opposite to the connecting part 2a to the writing body W formed at the tip of the above-mentioned pushing member 2. It is engaged with and held stably.

Further, the other end of the coil spring 4, that is, the end 4a on the side of the writing body W comes into contact with a hook step 5 provided in the barrel 1. Therefore, the coil spring 4 is disposed in series with the writing body W within the through hole 3 of the pushing member 2 which is spaced apart from the writing body W, and as a result, the thickness of the flat barrel 1 is reduced. Not only can the thickness be made thinner, but the width can also be kept extremely small.

Note that the hooking step 5 that comes into contact with the other end 4a of the coil spring 4 uses a step protruding from the inner wall of the shaft cylinder 1, but the contact structure between the two 4a and 5 is as follows. However, the present invention is not limited to this example, and for example, a washer member S may be interposed and the washer member S may be brought into contact with the hook step 5 (see FIG. 3). When the washer member S is interposed,
The elastic force when the coil spring 4 contracts is
It becomes possible to receive the entire surface of the washer member S, and the coil spring 4 can be expanded and contracted more safely. Reference numeral 6 denotes a fitting part provided at the tail end of the cursive body W, which engages with the coupling part 2a provided on the aforementioned push member 2 to removably connect the cursive body W and the push member 2. There is. P is the brush end of the cursive writing W, and the tip opening 1 of the shaft cylinder is pressed by the pressing member 2.
exposed from a. Reference numeral 7 denotes an irregularly shaped through hole provided closer to the rear end than the through hole 3 of the push member 2, which engages with a push button member 8 which is a component of a push member engagement/disengagement mechanism to be described later. Maintain or release the P exposure state. The push member engagement/disengagement mechanism may be appropriately determined and, if necessary, the push member 2 may be moved into the barrel 1 when the brush end P comes out and retracts from the barrel tip opening 1a.
Any structure that can be engaged and disengaged is sufficient.

Hereinafter, the protruding and retracting operation of the pen end P will be explained, focusing on an overview of the push member engaging/disengaging mechanism used here.

The irregularly shaped through hole 7 consists of a small diameter hole 7a and a large diameter hole 7b, and the push button member 8 moves only in a direction perpendicular to the axis of the barrel 1, and has a small diameter portion 8a and a large diameter portion 8b. It is always pushed downward and located in through holes 9a and 9b provided in the shaft cylinder 1, which will be described later. Reference numeral 10 denotes a spring member hooked between the large diameter portion 8b of the push button member 8 and the clip piece 11, which allows the push button member 8 to be inserted into the through holes 9a, 9b.
Inside, it is constantly firing downwards.

The large diameter portion 8b of the push button member 8 has a smaller diameter than the large diameter hole 7b of the irregularly shaped through hole 7, but has a larger diameter than the small diameter hole 7a. It has a small diameter.

As mentioned above, 9a and 9b are through holes provided in the upper and lower parts of the shaft cylinder 1, and the upper hole 9a has a larger diameter than the large diameter part 8b of the push button member.
The lower hole 9b has a smaller diameter than the large diameter portion 8b, but has a larger diameter than the small diameter portion 8a. When the brush end P is recessed into the barrel 1, the pushing member 2 is pushed into the barrel by the elastic force of the coil spring 4 which is in contact with the inner step 5 of the barrel and is located in the through hole 3. Rear end opening 1
When pressed in the b direction (→ mark direction), the small diameter portion 8a of the push button member 8 engages with the small diameter hole 7a, and the large diameter portion 8b of the push button member engages with the upper hole 9a of the shaft cylinder 1. The locking state of the push member 2 is maintained by engaging with the push member 2 (see FIG. 4). In order to expose the brush end P from this retracted state, the push member 2 is moved in the direction of the barrel tip opening 1a (← direction) against the elastic force of the coil spring 4 that contacts the barrel inner step 5.
In this pressing process, the large diameter portion 8b of the push button member, which has a smaller diameter than the large diameter hole 7b of the push member 2, engages with the large diameter hole 7b of the push member 2 (see Fig. 5). ), As a result, the push button member 8, which is always being pushed downward, causes its small diameter portion 8a to protrude from the lower hole 9b of the shaft tube 1, and its large diameter portion 8b to connect with the large diameter hole 7b of the push member and the shaft tube. The push member 2 is engaged with the upper hole 9a of the push member 2.

By locking the push member 2, the exposed state of the brush end P is maintained. Take the brush end P again,
In order to sink the push button member into the barrel 1, the small diameter portion 8a of the push button member protruding from the lower hole 9b of the barrel can be pushed upward against the elastic force of the spring member 10. Then, the large diameter portion 8b of the push button member separates from the large diameter hole 7b of the push member, and the locked state of the push member 2 is released.
Due to the elastic force of the coil spring 4 that comes into contact with the inner step 5 of the barrel, the small diameter portion 8a of the push button member engages with the small diameter hole 7a, thereby reproducing the above-mentioned retracted state of the pen end P.

``Effect of the invention'' As described above, the coil spring accommodated in the flat shaft cylinder in contact with the hooking step in the shaft cylinder is installed within the range of the thickness of the pushing member. It is possible to keep the diameter to the extent possible, and the positional relationship with the cursive is at a distance from the cursive, that is, in a straight line without overlapping with the cursive, so there is no restriction on the size of the diameter of the cursive. It has great practical merits, such as being able to easily obtain a flat writing instrument that is thin and extremely small in width, and can be carried by holding it between books.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional top view of a writing instrument in which the present invention has been implemented, Fig. 2 is a partially omitted longitudinal sectional view of a writing instrument in which the present invention has been implemented, and Fig. 3 1 is a resilient member and a step for hooking. FIG. 3 2 is a cross-sectional view taken along the line A-A in FIG. 3 1, and FIGS. 4 and 5 illustrate the relationship between the irregularly shaped through hole of the push member and the push button member. These are conceptual diagrams, and FIG. 4 is an explanatory diagram when the brush end is recessed into the barrel, and FIG. 5 is an explanatory diagram when the brush end is exposed. DESCRIPTION OF SYMBOLS 1... Axis tube, 2... Pushing member, 2a... Cursive joint part, 2c... Coil spring locking protrusion, 3... Through-hole part, 4... Coil spring, 4
a...Other end of the coil spring, 5...Step for hooking, 7...Irregular hole, 8...Push button member, 9a...Upper hole of the shaft cylinder, 9b...Lower hole of the shaft cylinder , S...Washer member.

Claims (1)

[Scope of utility model registration request] The writing body, which is housed in the flat barrel by being constantly springed toward the rear end opening of the barrel by a coil spring, is projected from the rear end opening of the barrel via an appropriate push member engagement/disengagement mechanism. In a writing instrument which is moved in the direction of the opening at the tip of the barrel by the pressing action of a pushing member so that the brush end thereof is exposed from the opening at the tip of the barrel, the writing instrument protrudes from the rear end opening 1b of the flat barrel 1. A connecting part 2a with the writing body W is provided at the tip of the flat pushing member 2, and a through hole 3 opening in a direction perpendicular to the axis of the pressing member 2 is provided. A locking protrusion 2c with which one end of the coil spring 4 engages is provided at a position linearly facing the connecting portion 2a of the writing body W, and the other end 4a of the coil spring 4 on the side of the writing body W is provided as an axis. A flat writing instrument characterized by being brought into contact with a hook step 5 provided in a cylinder 1.