JPS5845108Y2 - Shape pencil - Google Patents

Description

[Detailed description of the invention] This invention allows the writing tip to protrude or retract from the barrel of a mechanical pencil by a simple operation, and in the protruding state, knock the knock cap protruding from the end of the barrel if necessary, or knock the tip of the swivel barrel. The present invention relates to a novel mechanical pencil that allows a lead of a desired length to be delivered by rotating the pencil and is easy to disassemble and assemble.

Conventionally, in order to protect the writing tip of a mechanical pencil when not in use, i.e., to prevent damage such as bending of the writing tip due to a fall, or to prevent staining of the pocket when carrying it, the writing tip was pushed out and recessed with a deep knock. A so-called double-knock type mechanical pencil is known in which the lead is drawn out with a shallow knock, but it has the drawbacks of a complicated structure, frequent failures, and high cost.

The present invention alleviates these drawbacks.

An example applied to a knock-type mechanical pencil will be described below. Reference numeral 1 denotes a barrel, a tip barrel 1', and a distal barrel 1''.
It becomes.

The distal end of the shaft cylinder 1 has a tapered inner locking part 3, and the sliding cylinder 5, which is prevented from escaping toward the distal end by an inner protrusion 4, has one end attached to the flange 2. It is slidably mounted by the abutted ammunition 6.

A is a tip tube part 7 that is slidably inserted into the shaft tube 1 by a certain length.
．． Chuck 8. Spring 9. This is an internal mechanism consisting of a core membrane mesh tube 10.

In the internal mechanism A, when the core film mesh tube 10 is slid against the tip tube part 7 against the spring 9, the head of the chuck 8 fixed to the core film mesh tube 10 engages with the clutch 11, thereby locking the core. After moving forward a distance a while being clamped, the clutch 11 contacts the stage 7, the chuck 8 is expanded, the clamping of the core is released, and the core is drawn out a distance a.

Reference numeral 12 is a lead protection tube slidably mounted in the tip tube portion 7 and serves as a writing tip S, and the internal mechanism A functions as a sliding mechanical pencil.

However, the core protection tube 12 is fixed to the tip tube portion 7.

Alternatively, the lead protection tube 12 may be omitted and the tip tube portion 7 may be formed into a tapered shape to form a so-called fixed mechanical pencil.

Reference numeral 17 denotes a locking body that is fitted into the end opening of the core membrane mesh tube 10.

The locking body 17 has a base portion 20 which is connected with a fitting portion 18 that is removably fitted into the end opening of the core membrane tube 10, and a locking step portion 19 that is locked to the end surface of the core membrane cotton tube 10. One or more divided pieces 21.21 that expand from the base 20 toward the distal end.
It is made up of bullet pieces 22 consisting of...

The bullet piece 22 can be expanded and contracted, and the external shape of the end surface 23 when expanded in its natural state is larger than the end surface 5' of the sliding tube 5, and when it is contracted and closed, it is inside the sliding tube 5. It is formed to be smaller than its inner diameter so that it can be fitted.

Reference numeral 24 denotes a guide tube that is slidably fitted onto the internal mechanism A, and the inner diameter of the guide tube 24 is such that when the guide tube 24 is fitted onto the locking body 17, the bullet 22 is moved from the inner diameter of the sliding tube 5. It is formed to a size that can be contracted and closed to make it smaller.

Further, its outer shape is formed to a size such that it can be slidably inscribed in the inner wall of the shaft cylinder 1, for example, so that the internal mechanism A is located at the center of the shaft cylinder 1.

Further, when the internal mechanism A is slid toward the tip side, the writing tip S is exposed from the tip opening, and the tapered tip tube portion 7 is internally locked in the inner locking portion 3. The end surface 23 of the elastic piece 22 which is prevented from sliding in the distal direction and which expands in a natural state and is fitted to the distal end of the internal mechanism A acts as a locking portion to secure the end surface 5' of the sliding tube 5. It is configured so that it is locked in the writing state by being locked in the writing state to prevent sliding in the distal direction.

25 is an eraser that is removably fitted to the sliding tube 5, and 26 is a knock cap that is removably fitted to the sliding tube 5.

In use, the internal mechanism A slides toward the tip as shown in FIG. Since the locking part K formed at the end of the mechanism A locks with the sliding tube 5, there is no fear that the writing tip S will sink into the shaft 1, allowing smooth writing.

When the lead is worn out due to writing in this state, when the knock cap 26 is knocked, the sliding tube 5 slides toward the tip against the bullet 6 and is simultaneously locked to the sliding tube 5.

The core membrane mesh tube 10 also slides against the spring 8, and the chuck 8 advances and the core is fed out by a distance a with each knock.

When the use is finished, when the writing tip S is turned upward and the shaft tube 1 is turned over, the guide tube 24 first slides down toward the end due to its own weight and is locked to the end surface 5' of the sliding tube 5. At the same time, the bullet piece 22 is retracted and closed.

The compressed and closed bullet piece 22 becomes smaller than the inner diameter of the sliding tube 5, and the sliding tube 5 is released from the locking portion, and the internal mechanism A slides toward the distal end due to its own weight. As shown in FIG. 2, when the locking part K is fitted into the sliding tube 5, the writing tip S sinks into the shaft tube 1 through the tip opening, and the writing tip S is protected.

In addition, when replenishing the lead, use 25 erasers and 2 knock caps.
6, the internal mechanism will slide toward the distal end due to its own weight, and the core membrane mesh tube 10 will protrude from the end of the shaft tube 1. Therefore, it is easy to remove the locking body 17, which also serves as a plug, from the core membrane mesh tube 10. can be replenished.

To use it again, turn the barrel 1 over with the writing tip S facing downward from the state shown in Figure 2, and the internal mechanism A will slide to remove the bullet 2.
2 escapes from the sliding tube 5, it expands and is locked in a writable manner as shown in FIG.

FIG. 3 shows another embodiment in use.

In this embodiment, a cylindrical plug 117 is fitted into the end opening of the core membrane mesh tube 110, and its end surface 123 serves as a locking portion.

The sliding tube 105 has a bullet 1 consisting of one or more divided pieces 131, 131' that expands toward the tip in a natural state.
32 is formed, and a locking portion K is locked to the end surface 133, the writing tip S is exposed from the tip opening, and the internal mechanism A is locked so that writing is possible.

A guide slope 135 is formed on the outer circumferential surface of the bullet piece 132 and slopes outward from the end surface 133 toward the distal end.

The maximum diameter portion of this guide slope 135 is larger than the outer diameter of the cylindrical plug body 117.

124 is a guide tube that is slidably fitted onto the internal mechanism.

The inner diameter of the guide tube 124 is slightly larger than the outer diameter of the core mesh tube 110 and smaller than the outer diameter of the guide slope 135.

Reference numeral 124' is a tapered portion for making it easier to fit onto the guide slope 135, but it does not need to be particularly shaped.

After writing in this state, when the shaft tube 101 is turned over with the writing tip S facing upward, the guide tube 124 first slides down toward the distal end due to its own weight and is fitted onto the sliding tube 105 .

At this time, since the inner diameter of the guide tube 124 is smaller than the outer diameter of the guide slope 135, the bullet piece 132 is retracted and closed, and the end surface of the sliding tube 105 is
33 moves in the axial direction and is released from the locking portion, and the internal mechanism A slides toward the distal end due to its own weight, and the end surface 123 of the cylindrical plug body 117 is guided by the guide slope 135. Furthermore, when the bullet 135 is retracted and closed and fitted onto the sliding body 105, the writing tip S sinks into the barrel 101 as shown in FIG. 4, and the writing tip S is protected.

To use it again, turn the writing tip S downward from the state shown in FIG. At the same time as the fitting is released, the bullet pieces 132 are expanded and locked in a writable manner as shown in FIG.

In addition, although the internal mechanism or knock type was shown in the example,
A rotating four-type mechanical pencil may be obtained, for example, by configuring the rotating internal mechanism to be loosely inserted into the barrel so as to be non-rotatable but slidable relative to the barrel, with the rotating barrel protruding from the end of the barrel.

As described above, the present invention allows the writing tip of the mechanical pencil to protrude and lock for writing by simply turning the writing tip upwards or downwards and reversing the barrel, using the weight of the internal mechanism and the action of the guide tube. Since it can be retracted and locked, it is extremely easy to operate, and its structure is simple, so it is less likely to break down and can be used for a long period of time.

In addition, since the internal mechanism A can be located at the center of the barrel, there is no fear that the internal mechanism will bend and break the core, making it convenient to use.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention showing a used state, Fig. 2 is a cross-sectional view of an embodiment of the present invention showing an unused state, Fig. 3 is a cross-sectional view of another embodiment of the present invention showing a used state, and Fig. 4 The figure is a sectional view of other embodiments of the present invention showing an unused state, 1.101...shaft, 3,103...inner locking part, 5,105...・Sliding tube, 24, 12
4... Guide cylinder, A... Internal mechanism, K.
...Locking part.

Claims (5)

[Scope of utility model registration request] (1) The chuck is constructed so that the chuck moves forward and expands by sliding a lead storage tube that is slidably attached to the tip tube part, and the lead is fed out, or the lead is fed out by an appropriate means such as turning. The internal mechanism is formed with a tip opening and an inner locking part, and the distal end is slidably inserted into the shaft cylinder, which is equipped with a sliding body that is irremovably pushed toward the distal end. When the internal mechanism slides toward the tip of the barrel, the writing tip is exposed from the tip opening, the internal mechanism is locked in the inner locking part, and the locking part formed on the internal mechanism is attached to the sliding cylinder. The locking portion is locked so that it can be written on, and when sliding toward the end of the shaft cylinder, the locking portion and the sliding cylinder are locked by sliding of the guide cylinder that is slidably fitted onto the internal mechanism. Mechanical pencil configured to release. (2) The locking part formed at the end of the internal mechanism is a bullet split into one or more pieces that expands toward the end in a natural state, and the locking part is formed when the internal mechanism is at the tip of the barrel. When it slides to the side, it expands and its end face is locked to the end face of the sliding cylinder, and when it slides towards the end of the shaft cylinder, the guide cylinder is fitted onto the outside, contracted and closed, and is fitted inside the sliding cylinder. A mechanical pencil according to claim 1 of the utility model registration, which is formed so as to be (3) At the end of the core membrane storage tube, the base of the elastic piece is divided into a plurality of pieces and expands toward the distal end. The mechanical pencil according to claim 2 of the utility model registration claim, in which a locking body having a fitting portion to be fitted is fitted. (4) A locking part formed at the end of the internal mechanism that expands in a natural state toward the distal end formed at the distal end of the sliding cylinder when the internal mechanism slides toward the distal end of the shaft cylinder. Alternatively, when the bullet piece is locked on the end face of the bullet divided into a plurality of parts, and when it slides toward the end of the shaft cylinder, the guide tube is fitted onto the sliding cylinder bullet piece, and the bullet piece retracts and closes to the sliding cylinder. The mechanical pencil according to claim 1 of the utility model registration, which is formed so as to be fitted onto the outside. (5) The mechanical pencil according to claim 4, which is a registered utility model, wherein a guide slope is formed on the projecting piece of the sliding barrel, sloping outward from the end surface toward the distal end.