JPS5827744Y2 - knife - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a knife in which a blade plate extends and retracts straight from the sheath body.

Conventionally, folding knives used by children for learning had a blade plate pivoted to the tip of a holder with a retractable groove, and had the advantage that the blade plate could be rotated and housed in the retractable groove.

However, there is a problem in that the blade plate rotates during use, making it unstable and difficult to use.

In this invention, the blade plate and the mounting plate that locks the blade plate are slidably fitted into the sheath body, and the sheath body and the mounting plate are specially designed to support the blade plate in a fixed state at the protruding position of the blade plate. The objective is to provide a knife that is easy to use and therefore easy to use.

The blade plate 2 of the knife 1 has a substantially rectangular shape and has a blade 21 on one long side.
A long hole 22 is formed at the base end and engages with a mounting plate 3 to be described later.
has been established.

The sheath body 4 that accommodates the blade plate 2 is formed of synthetic resin into a flat cylindrical shape, and has a hollow portion 41 inside which the blade plate 2 can slide with a margin. Openings 42, 43 are provided at the front and rear ends of the housing.

On the inner surface of one side wall 44 of the sheath body 4, parallel protrusions 4 are provided in the direction of the operator.
5.45, and the other side wall 46 is provided with a sliding groove 47 extending in the longitudinal direction and reaching the rear end of the sheath body 4.

As shown in FIG. 5, a locking protrusion 5 is provided on the inner surface of the rear end of the sliding groove 47 in an inwardly protruding manner, and the locking protrusion 5 forms a gentle slope 51 from the top to the rear end. , a steeply sloped surface 52 is formed from the top to the front side.

The bottom surface of the front end side of the sheath body 4 forms a tapered surface 8 that is inclined in a direction in which the front end frontage 42 side gradually decreases.

The sheath body 4 has parallel protrusions 4 on its inner surface as shown in FIG. 4, for example.
A side plate 4a having protrusions 5 and 45 and a side plate 4b having a sliding groove 47 are manufactured separately by injection molding of synthetic resin,
It is formed by abutting and adhering contact protrusions 49 and 49 provided inwardly projecting on the long sides of the side plates 4a and 4b.

A mounting plate 3 for slidingly operating the blade plate 2 is slidably fitted into the hollow portion 41 of the sheath body 4.

The mounting plate 3 is made of synthetic resin and has a rear part 31 as shown in FIG.
is thicker than the front part 32, the thickness 33 of the rear part is approximately equal to the gap width 40 of the hollow part 41 of the sheath body 4 shown in FIG. 2, and the thickness 34 of the front part 32 is thicker than the thickness 33 of the rear part. , sheath body 4
It is smaller by the sum of the height of the protrusion 45 and the thickness of the blade plate 2.

On the surface of the mounting plate 3 facing the protrusion 45, a groove 35 into which the protrusion 45 is loosely fitted is provided in the rear part 31, and a locking piece 36 is provided in the front part 32 to fit into the long hole 22 of the blade plate 2. to protrude.

On the other side of the mounting plate 3, as shown in FIGS. 2 and 5, an operating piece 61 is provided at the tip of the connecting portion 6 that engages and slides in the sliding groove 47 of the sheath body 4. is the locking protrusion 5 of the sheath body 4.
A recess 62 that can be engaged and detached is formed.

Further, the lower surface of the front portion 32 of the mounting plate 3 is formed into a tapered surface 7 that can come into close contact with the tapered surface 8 of the sheath body 4.

Then, the blade plate 2 is inserted from the rear end opening 43 of the sheath body 4 with the locking piece 36 of the mounting plate 3 fitted into the hole 22 of the blade plate 2.

Immediately before the insertion is completed, the connecting portion 6 of the mounting plate 3 comes into contact with the locking protrusion 5 of the sheath body 4 to prevent insertion, but the mounting plate 3 and the sheath body 4 are both made of synthetic resin and have elasticity. Of course, the locking protrusion 5
Since the surface on the push-in side is a gentle slope 51, by pushing strongly, the connecting part 6 rides on the slope 51, and as shown in FIG. intervenes.

In the above state, the blade plate 2 is accommodated within the sheath body 4.

Since the mounting plate 3 that locks the blade plate 2 engages with the locking protrusion 5 of the sheath body 4 and does not move, the blade plate 2 will not come out even if the front end of the sheath body 4 is turned downward, making it safe. be.

When using the knife, push the operating piece 61 of the mounting plate 3 toward the front end of the sheath body 4.

Due to the elastic deformation of the locking projection 5 and the mounting plate 3 as described above, the connecting portion 6 rides over the locking projection 5, thereby the mounting plate 3 moves to the front side of the sheath body 4, and therefore the blade plate 2 is moved to the front side of the sheath body 4. It protrudes from the front end opening 42 of the body 4.

At the front end of the movement of the mounting plate 3, when the operating piece 61 is pushed more forcefully toward the front end of the sheath body 4, the tapered surface 7 of the mounting plate 3 and the tapered surface 8 of the sheath body 4 come into close contact, and the mounting plate 3 and The blade plate 2 is fixedly fixed to the sheath body 4.

When the blade plate 2 is housed in the sheath body 4, the operation piece 61 is pushed toward the rear end of the sheath body 4, and the recess 62 of the mounting plate 3 is engaged with the engagement protrusion 5 of the sheath body 4 as described above.

In the present invention, as described above, the blade plate 2 and the mounting plate 3 that locks the blade plate 2 are slidably fitted into the sheath body 4, and the front inner surface of the sheath body 4 and the front part of the mounting plate 3 are closely attached to each other. Since the tapered surfaces 7 and 8 are formed, when the blade plate 2 is protruded, the tapered surfaces 7 and 8 are formed.
8 can be strongly engaged to fix the mounting plate 3 and hence the blade plate 2 to the sheath body 4, which has an excellent effect that the blade plate 2 can be used stably without wobbling.

[Brief explanation of drawings]

Fig. 1 is a front view of the knife, Fig. 2 is a sectional view taken along line III in Fig. 1, Fig. 3 is a sectional view taken along line III-III in Fig. 2, Fig. 4 is an exploded view of the knife, and Fig. 5 is a sectional view taken along line III in Fig. 1. The figure is a sectional view showing the engagement state between the mounting plate and the locking protrusion. 2...Blade plate, 3...Mounting plate, 4...
... Sheath body, 5 ... Locking protrusion, 7, 8 ...
...Tapered surface.

Claims (1)

[Scope of utility model registration request] The blade plate 2 and the mounting plate 3 that locks the base end of the blade plate are slidably fitted into the hollow part 41 of the sheath body 4, and a part of the inner circumferential wall at the front end of the sheath body is gradually reduced on the front end frontage 42 side. A sliding groove 47 formed on the tapered surface 8 inclined in the direction and opened on the side wall of the sheath body 4.
A knife characterized in that an operation piece 61 protruding from the mounting plate 3 is slidably exposed, and the mounting plate 3 is formed with a tapered surface 7 that matches the tapered surface 8 of the sheath body 4.