JP2606901B2 - Backing knife - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back-stop knife in which a blade is foldably supported on a handle.

[Prior art] Conventionally, a blade portion is foldably supported at the front end of a handle,
A back metal for the blade part lock is fixed between a pair of side plates provided on this handle so that its front end is a free end, and when the blade part is opened, the front end of the back metal is attached to the base end of the blade part. Various types of back-stopping knives in which the blade portion is locked by being locked have been devised.

For example, in a back-stopping type knife disclosed in Japanese Utility Model Laid-Open Publication No. 59-160076, as shown in FIG.
A movable plate 92 for releasing the lock is operably provided on the outside of the front portion of the side plate 93 so as to be linked to the front end of the back metal.

[Problems to be Solved by the Invention] Although the above-mentioned back-stopping type knife has a smart appearance and is excellent in design, the thumb is applied to the movable plate 92 to operate the movable plate 92. Therefore, blade part 91
Therefore, there is a risk that the thumb is easily damaged when the blade 91 is folded.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a back-stopping knife which solves the above-mentioned problems, can be operated more safely, and is easy to use.

[Means for Solving the Problems] In order to solve the above problems, a backing knife of the present invention is configured as follows.

That is, the blade portion is supported at the front end of the handle so as to be foldable, and a back metal for locking the blade portion is fixed between a pair of side plates provided on the handle so that the front end portion is a free end, and is attached to the side plate. On the other hand, in a back-stopping knife in which the locking projection of the front end of the back metal is engaged with the locking recess of the blade when the blade is opened, at least one side plate is used to unlock the blade. A rotatable movable side plate having a rear end portion as an operation portion, wherein the movable side plate is engaged with a locking portion provided at a front end portion of the back metal so that the back metal is interlocked with the movable side plate. A stop was provided.

Further, the length from the operation portion at the rear end of the movable side plate to the center of rotation of the movable side plate is longer than the length from the center of rotation of the movable side plate to the locking portion of the movable side plate.

[Operation] The movable side plate is rotated by pressing the operating portion at the rear end of the movable side plate. Since the locking portion provided on the movable side plate is engaged with the locking portion provided at the front end of the back metal, the back metal also moves with this rotation, and the engagement between the locking convex portion of the back metal and the blade portion is performed. The engagement of the stop recess is released, and the lock of the blade portion is released.

The length from the operating part of the movable side plate to the center of rotation of the movable side plate is longer than the length from the center of rotation of the movable side plate to the locking part of the movable side plate. Can be unlocked against the force of the back metal to lock the blade.

[Examples] Hereinafter, first to first embodiments of the present invention will be described.
This will be described with reference to FIG.

As shown in FIG. 1, the back metal 2 is sandwiched between a fixed board 31 disposed on the right side thereof and a middle plate 4 disposed on the left side thereof, and as shown in FIGS. The ends are fixed to each other by a pair of fixing pins 11, and the front end 21 of the back metal 2 is a free end having elasticity.

A movable substrate 51 is rotatably supported on the outside of the middle plate 4 by support pins 7 attached to a position closer to the front than the center of the movable substrate 51. Further, decorative plates are provided outside the fixed substrate 31 and the movable substrate 51, respectively.
8a and 8b are fixed.

As described above, the handle 1 includes the fixed side plate 3 including the fixed substrate 31 and the decorative plate 8a, the back metal 2, the middle plate 4, and the movable side plate 5 including the movable substrate 51 and the decorative plate 8b. The base end of the blade portion 6 is rotatably supported by the support shaft 12 between the middle plate 4 and the fixed substrate 31.

Note that a finger pad 80 as an operation unit is formed on the rear end of the decorative plate 8b.

As shown in FIG. 3, a locking projection 2a is provided on the lower surface of the front end of the back metal 2, and an engaging hole 2b extending in the width direction is provided at the front end of the back metal 2. . The locking projection 2a
Can be engaged with the locking recess 6a formed on the upper surface of the base end of the blade part 6 to lock the blade part 6 in a state of being opened forward of the handle 1.

Further, as can be seen from FIGS.
An engagement projection 5a is provided on the inner surface of the front end of the back plate 2. The engagement projection 5a is fitted into an engagement hole 2b at the front end of the back metal 2 through a through hole 4a formed at the front end of the intermediate plate 4. 2 and the movable side plate 5 can be interlocked.

The through hole 4a has a size that does not prevent the locking projection 5a of the movable substrate 51 from moving up and down when the movable side plate 5 is rotated up and down to release the lock of the blade unit 6. Is formed.

Next, the operation and effect of the back-stopping knife configured as described above will be described.

As shown in FIGS. 1 and 3, in the use state in which the blade 6 is opened forward of the handle 1, the locking projection 2a of the back metal 2 is
And the blade 6 is locked by engaging with the locking concave portion 6a. In order to fold the blade part 6 into the inside of the handle 1 from this state, for example, the right index finger and the middle finger support the lower surface of the rear end of the fixed side plate 3 on the right side of the handle 1 and the rear side of the movable side plate 5 on the left side of the handle 1. The abdomen of the thumb is applied to the finger rest 80 on the end, and the rear end of the movable side plate 5 is pressed downward. Then, since the movable side plate 5 rotates around the support pin 7, the locking projection 5a at the front end of the movable side plate 5 is provided.
Tries to move up.

Since the locking projection 5a is fitted into the engaging hole 2b at the front end of the back metal 2, the force for pushing up the front end 21 of the back metal 2 by the rotation of the movable side plate 5 is transmitted to the back metal 2. Is done. At this time, in order to keep the engaging projection 2a of the back metal 2 engaged with the engaging concave portion 6a of the blade 6, the elastic force against the force of pushing up the back metal 2 is applied to the back metal 2. Works, but money 2
The front end 21 is moved up.

Accordingly, the locking projection 2a of the back metal 2 and the locking recess 6a of the blade 6 are formed.
Is disengaged, and the blade part 6 can rotate. Then, when the blade 6 is rotated in the folding direction from the state in which it is opened forward of the handle 1, the blade 6 can be stored inside the handle 1 as shown in FIG.

In the back-stopping knife of the present embodiment, in order to release the lock of the back metal 2, a finger is applied to the rear end of the handle 1, so that the finger is applied near the front end of the handle 1. The risk of injuring fingers with the blade section 6 is small and the safety is high.

Further, the length from the support pin 7 which is the center of rotation of the movable side plate 5 to the finger contact portion 80 at the rear end of the movable side plate 5 is longer than the length from the connection pin 7 to the locking projection 5a at the front end of the movable side plate 5. According to the principle of leverage, the lock can be released easily by moving the front end 21 of the back metal 2 upward even if the force for pressing the finger contact portion 80 of the movable side plate 5 is small. Conversely, blade part 6
Even if the elasticity of the front end 21 of the back metal 2 is considerably increased in order to secure the lock of the back plate 2, the finger pad 80 of the movable side plate 5 is pressed with a force that can be taken out by a normal person and the blade 6 Can be unlocked.

Further, the knife of the present embodiment has a movable side plate 5 operated for unlocking, which is integrated with the handle 1, and has an excellent design which gives a smart appearance.

In the above embodiment, the side plate arranged on the left side of the handle 1 is the movable side plate 5, but it may be provided on the right side for left-handed use. Is also good.

Also, as shown in FIG. 6, a locking portion 6b is cut and formed on the lower surface of the base end portion, and the blade portion 6 is folded inside the handle 1 as shown in FIG. Alternatively, the locking portion 6b may engage with the locking projection 2a of the back metal 2. In this way, even when the blade 6 is folded inside the handle 1, the blade 6 is not operated unless the movable side plate 5 is operated to release the lock.
Cannot be opened from the handle 1 and the danger of accidentally exposing the blade portion 6 is reduced, and the safety is improved.

[Effect of the Invention] In the back-stopping knife of the present invention, at least one of the side plates sandwiching the back metal is a movable side plate for unlocking the blade, so that the appearance is smart and the design is smart. A knife having excellent properties can be obtained.

In addition, since the rear end of the movable side plate is used as the operation unit, when folding the blade unit, the finger can be operated away from the blade unit, and the safety is high.

Furthermore, the lock of the blade can be unlocked by applying only a small force by utilizing the leverage principle, and an excellent effect of extremely easy use is achieved.

[Brief description of the drawings]

1 to 5 show one embodiment of the present invention, and FIG.
The figure is an exploded perspective view, FIG. 2 is a plan view, and FIG. 3 is A in FIG.
FIG. 4 is a sectional view taken along the line AA in a state where the blade portion is folded, FIG. 5 is a sectional view taken along the line BB in FIG. 2,
FIGS. 6 and 7 show a knife with a blade part of another embodiment,
6 is a view corresponding to FIG. 3, FIG. 7 is a view corresponding to FIG. 4, and FIG. 8 is a front view showing an example of a conventional back-stopping knife. DESCRIPTION OF SYMBOLS 1 ... Pattern, 2 ... Back metal, 2a ... Locking convex part, 2b ... Engagement hole as locking part, 3 ... Fixed side plate as side plate, 5 ...
A movable side plate as a side plate, 5a ... a locking projection as a locking portion, 6 ... a blade portion, 6a ... a locking concave portion, 7 ... a support pin as a rotation center, 21 ... a front end portion, 80 ... ... A finger rest as an operation unit.

Claims (2)

(57) [Claims] 1. A blade (6) is foldably supported on a front end of a handle (1), and a pair of side plates (3, 3) provided on the handle (1) is provided.
5) Attach the blade (6) with the backing metal (2) for locking so that the front end (21) is a free end, and open the blade (6) to the side plates (3, 5). When the backing knife (2) engages with the locking projection (2a) of the front end of the backing metal (2) into the locking recess (6a) of the blade (6) to enable locking, at least one side plate has a blade. A rotatable movable side plate (5) having a rear end as an operation portion (80) for unlocking the portion (6), and a back metal (2) interlocks with the movable side plate (5). Thus, the movable side plate (5) is provided with a locking portion (5a) for engaging with the locking portion (2b) provided at the front end of the back metal (2). The distance from the operating portion (80) at the rear end of the movable side plate (5) to the center of rotation (7) of the movable side plate (5) is determined by the center of rotation of the movable side plate (5). 2. A back-stop knife according to claim 1, wherein the length of the knife is longer than a length between the movable side plate and the engaging portion of the movable side plate.