JPS5839919Y2 - Shape pencil - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the improvement of a mechanical pencil, particularly a knock-type mechanical pencil.

In general, a knock-type mechanical pencil has a core pipe to which a reed chuck is fixed at the tip of an outer cylinder that can be gripped, and a movable range with respect to the outer cylinder is defined, and the lead chuck is fitted into the reed chuck. It is equipped with a chuck tightening tube that is installed and works together with the chuck tightening tube.

Moreover, in order to prevent the lead from breaking during writing, a writing pressure adjustment means is added that is connected to the reed chuck and has a spring interposed in the movable cylinder, which prevents excessive force on the lead during writing, that is, excessive bending force. It has been proposed that when pen pressure is applied, the spring bends and absorbs this force.

However, in the above-mentioned knock-type mechanical pencil, the structure of each part of the outer cylinder, the writing pressure adjustment means and the lead gripping mechanism inside the outer cylinder is complicated, which increases the processing cost and makes it difficult to manufacture at a low price. was causing inconvenience.

In view of the above-mentioned current situation, the purpose of this invention is to provide a mechanical pencil with an elegant appearance, which is equipped with an integrally molded outer cylinder that can be manufactured at low cost, and has a crease prevention function that is easy to operate.

Examples of this invention will be described below based on the drawings.

Fig. 1 and Fig. 2 show the overall structure of a knock-type mechanical pencil according to an embodiment of this invention, and reference numeral 1 is an integrally molded mechanical pencil made of good quality material that can be used for luxury products, for example, and can be held by a scribe. It is an outer cylinder made of a cylindrical body.

This outer cylinder 1 has a core guide hole 1a at its tip.
At least one locking hole 1b is bored on the outer periphery of one end.

Inside the outer cylinder 1, as shown in the partially enlarged view of FIG. 3, a collar 2a is formed, on which a first spring 3 is engaged, which is movable toward the rear end in the axial direction and is used to move the lead grip. A movable cylinder 2 is provided.

A reed chuck 5 having a chuck tightening tube 4 whose axial movement is controlled externally fitted to the collar 2a of the movable cylinder 2 is connected to a core vibro at its rear end, and is installed inside the movable cylinder 2. There is.

Therefore, the first spring 3 in the movable cylinder 2 engages the tip of the core vibro and the collar 2a, and applies a pressing force to return the lead chuck 5 to the rear.

Further, a relatively weak second spring 7 related to writing pressure is fitted onto the tip side of the lead vibro.

The second spring 7 is resiliently inserted between the rear end of the movable cylinder 2 and the tip of a cylindrical stopper pipe 8 which is fitted over the core vibro.

A locking member 9 made of an elastic pipe having a C-shaped cross section and having a tapered protrusion 9a that engages with the locking hole 1b of the outer cylinder 1 at one end of the outer periphery is in contact with the rear end of the stopper pipe 8. will be placed.

Note that the stopper pipe 8 and the locking member 9 may be integrally molded.

As a result, the stopper pipe 8 is fixed to the outer cylinder 1 via the locking member 9, so that the second spring 7 can be positioned.

Therefore, the movable tube 2 is pressed against the tip side of the outer tube 1, and if an unreasonable force, that is, an excessive bending force or writing pressure is applied to the lead A, the second spring 7 will deflect and absorb this force. .

As described above, in the embodiment of this invention, the chuck tightening tube 4 forming the lead gripping mechanism is provided inside the integrally molded outer cylinder 1.
, lead chuck 5, core vibro, first spring 3
and a second spring 7 for adjusting writing pressure.
It has a structure in which the movable cylinder 2 and the outer cylinder 1 are locked by a locking member 9 via a simple-shaped stopper pipe 8.

Therefore, the lead gripping mechanism is configured as a set,
By intermittent pressing, the core vibro can reciprocate against the biasing force of the first spring 3, and the core A can be moved forward.

In addition, the stopper pipe 8 that is locked by the second spring 7 is not affected by the reciprocating movement of the core vibro and is locked via a locking member provided separately on the outer cylinder 1, so the mounting structure is easy. This makes processing easier.

In the above embodiment, the locking member 9 has a cross section C as shown in FIG.
Although one tapered protrusion 9a is formed at one end of the outer periphery of the letter-shaped pipe, it may be formed as shown at the opening in FIG.

That is, in the example shown in FIG. 4, a plurality of grooves 9b, 9
A plurality of tapered protrusions 9 a and 9 a are formed at one end of a resilient pipe provided with a pipe.

In addition, in FIG. 4C, a plurality of grooves 9b, 9b are provided point-symmetrically to form an elastic pipe shape, and a plurality of tapered projections 9c, 9 protrude inside and outside the circle of the grooves 9b, 9b.
c.

and a plurality of tapered protrusions 9a of the above-mentioned retaining member 9.
, 9a, a plurality of locking holes 1a of the outer cylinder 1 may be provided in a corresponding manner.

Since this invention has such a structure, there is no need to form a complicated protrusion inside the outer cylinder, and there is no need for threading of the outer cylinder, and the structure is integrally molded and has an elegant appearance.

Furthermore, since the lead gripping and advancing mechanism is integrated into the movable cylinder and the spring stopper for adjusting the writing pressure is made into a separate and easily machined shape, it can be manufactured at extremely low cost.

In addition, assembly is accomplished by inserting the lead gripping and advancing mechanism into the outer cylinder, then inserting the stopper pipe via the spring of the bristles 2, making the tapered part of the engaging member forward, and inserting and locking it into the retaining hole.

For disassembly, the stopper pipe can be taken out by pressing the protrusion through the locking hole in the outer cylinder with tweezers or the like.

After that, you can pull out the core vibrator.

In this way, it can be manufactured at low cost with a simple structure and easy assembly.
As an easy-to-operate knock-type mechanical pencil, it has great effects.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a partially cutaway perspective view of the overall structure of a mechanical pencil showing an embodiment of this invention, FIG. 3 is a partially enlarged sectional view of FIG. 1, and FIG. C is a perspective view of an engaging member used in an embodiment of this invention. 1...Outer cylinder, 1a...Engagement hole, 2...
...Movable tube, 4...Chuck tightening pipe, 5.
...Lead chuck, 6 ... Core pipe,
8...stopper pipe, 9...locking member, 9a, gc...tapered projection.

Claims (1)

[Scope of utility model registration request] At least one locking hole 1 on one end of the outer periphery for gripping when writing
An outer cylinder 1 that is hollowed out from a cylindrical body with a hole formed therein, a movable cylinder 2 that is elastically provided at the rear end of the outer cylinder 1 in the axial direction so as to be movable, and a chuck clamp that is installed inside the movable cylinder 2. A core vibro which is connected to a reed chuck 5 on which the attachment tube 4 is fitted externally, and a stopper pipe 8 which is fitted externally on the core vibro and springs into engagement with the rear end of the movable cylinder 2, and are provided at the rear end of the stopper pipe 8 to engage the lock A mechanical pencil comprising an elastic pipe-shaped locking member 9 having at least one protrusion 9a formed on its outer periphery to engage with a hole 1b.