JP2909383B2 - Blade positioning mechanism for blade-retractable knife - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knife in which a blade body is rotatably supported with respect to a holder so that a blade body can be stored and a blade body is projected. The present invention relates to a blade positioning mechanism capable of restricting rotation of the blade and preventing rotation of the blade when the blade is protruded.

[0002]

2. Description of the Related Art Conventionally, as a knife of this type, for example, there is one shown in Japanese Utility Model Laid-Open No. 55-28355. In this blade body positioning mechanism of the knife, the rotation of the blade body is prevented by the back metal when the blade body protrudes, and the locked state is released by the cam member of the back metal push-up mechanism. On the other hand, the rotation of the blade body is regulated by the backing metal in the stored state of the blade body, or the blade body is rotated after the regulation by the backing metal is released by operating the backing metal lifting mechanism in the regulated state, or If the blade body is rotated against the elasticity of the backing metal in the restricted state, the blade body is brought out of the stored state.

[0003]

By the way, in such a blade body storing type knife, for example, in order to make it easier to take out the blade body from the holder in the state where the blade body is stored, for example, Japanese Utility Model Application Laid-open No. Sho 60-2.
As shown in Japanese Patent No. 7861, the back side of the blade is exposed from the holder. However, when the back side of the blade body is exposed in this manner, the width of the entire knife becomes larger than the width of the holder in the stored state of the blade body, and there is a disadvantage that the knife is bulky when being carried. This point is described in the above-mentioned Japanese Utility Model Application 55-28.
The same applies to the knife according to the '355 publication.

SUMMARY OF THE INVENTION The present invention provides a knife having a predetermined blade body positioning mechanism, which is provided with a blade body pull-out assisting mechanism so that the stored blade body can be easily taken out and, consequently, the knife can be downsized when the blade body is housed. That is the purpose.

[0005]

As shown in the drawings of the embodiments to be described later, in the blade-containable knife according to the present invention, the blade 7 is supported rotatably with respect to the holder 1 and the inside of the holder 1 is provided. And the holder 1
And a state protruding from the mouth 6 of the camera. Further, a back metal 16 having a pressing portion 18 is attached to the holder 1, and the pressing portion 18 is engaged with the cam portion 11 of the blade body 7 in the stored state and the protruding state of the blade body 7, respectively. And a state in which the blade body 7 is separated from the cam portion 11 and the rotation of the blade body 7 is allowed.

The operation of the operation unit 21 supported on the holder 1
The cam body 23 that is interlocked with the
Supported between the camera unit 11 and the camera unit 11. The cam body 23,
The position where the pressing portion 18 of the back metal 16 is engaged with the cam portion 11 of the blade body 7 and the position where the pressing portion 18 is similarly disengaged can be taken in the stored state and the protruding state of the blade body 7, respectively. And a first pressing portion 24 for pressing the back metal 16.
doing.

Further, the cam body 23 is provided with a first pressing portion 2.
In addition to the first pressing portion 2 with the blade body 7 housed,
4 , when the pressing portion 18 of the back metal 16 is released .
It has a second pressing portion 25 for pressing the blade body 7. This second
When the blade body 7 is pressed by the pressing portion 25, the blade body 7 rotates and is exposed from the insertion opening 5 of the holder 1.

[0008]

When the pressing portion 18 of the back metal 16 is engaged with the cam portion 11 of the blade body 7, the blade body 7 is positioned between the housed state and the projected state. In particular, when the blade body 7 is changed from the stored state to the protruding state, the blade body 7 is pulled out of the holder 1 by the function of the cam body 23, together with the release of the positioning of the blade body 7. Then, the blade body 7 is gripped and taken out.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a knife according to an embodiment of the present invention;

As shown in FIGS. 1 and 3, the holder 1 comprises left and right side plates 2 and a butt portion 3 connecting the rear ends thereof, and the upper, lower and front sides between the left and right side plates 2 are formed. The back opening 4, the blade body insertion / removal opening 5, and the blade body protruding opening 6 are formed to be opened respectively.

The blade body 7 includes a base 8, a back 9 extending from the base 8, and an abdomen on the opposite side of the back 9.
And a cutting edge 10 extended from the A cam portion 11 is formed on the base portion 8. The cam portion 11 is inserted between the left and right side plates 2 near the mouth portion 6 and is rotatably supported by a support shaft 12. The cam portion 11 has an arc portion 13, a lock concave portion 14, and a pressure receiving portion 15. Arc part 13
Is on a circular locus C having a radius r around the support shaft 12. The lock concave portion 14 as a lock portion is
One end of the arc portion 13 is connected to the one end of the arc portion 13 via a locking step (locking portion) 14a. The pressure receiving portion 15 is continuous with the other end of the arc portion 13 between the arc portion 13 and the cutting edge 10. The distance between the inner bottom portion 14b of the lock concave portion 14 and the pressure receiving portion 15 and the support shaft 12 is smaller than the radius r. The back 9
Is formed with a finger hook 9a. And this blade body 7
Is rotated about the support shaft 12 so that the blade body can be stored in the blade body storage state shown in FIG. 1 and the blade body projecting state shown in FIG. In this blade body storage state, the entire blade body 7 is stored in the holder 1 through the insertion / removal opening 5, and the back 9 of the blade body 7 is
Not exposed to the outside. In addition, in the blade body protruding state,
The blade body 7 protrudes forward from the mouth 6 of the holder 1.

A back metal 16 is rotatably supported by a support shaft 17 in a back opening 4 of the holder 1, and is supported by a base portion 16 a of the holder 3 at the buttocks 3 of the holder 1 and near the mouth 6 of the holder 1. It is extended to a cantilever shape. This money 16
A pressing portion 18 is provided at a free end portion of the blade member 7 so as to project downward toward the cam portion 11 of the blade body 7. As the cam portion 11 rotates, an arc portion 13, a lock concave portion 14, and a pressure receiving portion 15 are formed. Each can be engaged. And this back money 16
Can take the engaged state shown in FIGS. 1 and 3 and the disengaged state shown in FIGS. 2 and 4. In this engaged state, the pressing portion 18 moves downward, and as shown in FIG. 1, the pressing portion 19 engages with the pressure receiving portion 15 of the cam portion 11 in the housed state of the blade body 7 to rotate the blade body 7. The movement is restricted, and as shown in FIG. 3, the pressing portion 18 is engaged with the lock concave portion 14 of the cam portion 11 with the blade body 7 protruding, so that the rotation of the blade body 7 is prevented. In this separated state, the pressing portion 18 separates from the pressure receiving portion 15 and the lock concave portion 14, and the rotation of the blade body 7 is allowed. A pressure receiving portion 19 is formed on the back metal 16 behind the pressing portion 18 and continuously therewith.

A recess 20 is formed in the vicinity of the mouth 6 of the holder 1 outside the one side plate 2, and an operation lever 21 as an operation portion is rotatably supported by a support shaft 22 in the recess 20. I have. The support shaft 22 extends into the holder 1 slightly behind the support shaft 12 of the cam portion 11 and the pressing portion 18 of the back metal 16, and the support shaft 2 extends between the back metal 16 and the cam portion 11.
2, a cam body 23 is attached so as to be integrally rotatable. The cam body 23 has an upper pressing portion 24 and a lower pressing portion 25 at 180-degree point symmetric positions. 1 and 3
(B) As shown in (c) and (d), when the operation lever 21 is in the upward movement position, the cam body 23 is brought into the falling position in conjunction with the movement, and the upper pushing contact portion 24 and the downward pushing of the cam body 23 are performed. Contact 25
Are separated from the pressure receiving portion 19 of the backing 16 and the pressure receiving portion 15 of the cam portion 11 of the blade body 7. When the operating lever 21 is at the lower movement position as shown in FIGS. 2 and 4, the cam body 23 becomes the pressing position in conjunction with the movement, and the upper pressing portion 24
And the lower pressing portion 25 comes into contact with the pressure receiving portion 15 of the blade body 7.

In the retracted state of the blade body 7 shown in FIG. 1, since the cam body 23 is in the falling position at the upward movement position of the operation lever 21, the pressing portion 18 of the back metal 16 is The blade 7 is pressed against the pressure receiving portion 15, and the rotation of the blade 7 is restricted by the pressing force, so that the blade 7 is not accidentally pulled out from the insertion opening 5 of the holder 1.

Next, as shown in FIG.
Is rotated to the lower movement position, the cam body 23 rotates, and the upper pressing portion 24 pushes up the pressure receiving portion 19 of the back metal 16, and the pressing portion 18 of the back metal 16 moves the cam portion 11 of the blade body 7. Away from the circular locus C. At the same time, the lower pressing portion 2 of the cam body 23
5 presses down the pressure receiving portion 15 of the blade body 7, and the pressure receiving portion 15 rotates upward without interfering with the pressing portion 18 of the back metal 16 evacuated upward, and the blade body 7 is inserted into and removed from the insertion opening 5 of the holder 1. Drawn a little from.

Further, when the blade body 7 is gripped and rotated, as shown in FIG. 3A, the pressing portion 18 of the back metal 16 is pressed against the arc portion 13 of the cam portion 11 of the blade body 7. While approaching the lock recess 14 of the cam portion 11. At this time, the upper pressing portion 24 of the cam body 23 is rotated downward by the pressure receiving portion 19 of the back metal 16 and the lower pressing portion 25 of the cam body 23 is
3 is pressed. Then, as shown in FIGS. 3B, 3C, and 3D, when the pressing portion 18 separates from the circular arc portion 23 and engages with the lock concave portion 14, the locking step portion 14a of the lock concave portion 14 is moved. The rotation of the cam portion 11 is prevented by hitting the pressing portion 18, and the blade body 7 protrudes from the opening 6 of the holder 1, and the protruding state is maintained. At this time, the upper pressing portion 24 of the cam body 23 is further pushed downward by the pressure receiving portion 19 of the back metal 16, and the cam body 23 is separated from the pressure receiving portion 19 of the back metal 16 and the pressure receiving portion 15 of the blade body 7 at the falling position. And the operation lever 21 returns to the upward movement position.

When the operating lever 21 is moved to a lower position as shown in FIG. 4 with the blade body 7 shown in FIG.
3 is the pressing position, the upper pressing portion 24 pushes up the pressure receiving portion 19 of the back metal 16, and the pressing portion 18 of the back metal 16 is pulled upward from the lock concave portion 14 and the circle of the arc portion 13 of the cam portion 11. Move away from locus C.

When the blade 7 is rotated from the unlocked state, the blade 7 is housed in the holder 1 as shown in FIG. 1 through the states shown in FIGS. 4C and 4D. This embodiment has the following features.

(A) When the blade body 7 is stored, the back metal 16
The pressure receiving portion 15 of the cam portion 11 of the blade body 7 is pressed against the pressing portion 18 to restrict the rotation of the blade body 7, and the blade body 7 is
No longer inadvertently protrude from the When the blade body 7 is in the protruding state, the pressing portion 18 of the back metal 16 is engaged with the lock recess 14 of the cam portion 11 of the blade body 7 to prevent the rotation of the blade body 7, and the blade body 7 is in the protruding position. Is securely held.

(B) When the blade body 7 is stored, the pressing portion 18 of the back metal 16 is pushed up by the upper pressing portion 24 of the cam body 23 and separates from the pressure receiving portion 15 of the cam portion 11 of the blade body 7. The rotation restriction of the blade body 7 is released. At the same time, the pressure receiving portion 15 of the cam portion 11 of the blade body 7 is pushed down by the lower pressing contact portion 25 of the cam body 23, so that the rotation of the blade body 7 is released and the blade body 7 is moved to the holder 1. Exposed through the insertion / extraction opening 5,
The blade body 7 can be easily pulled out from the holder 1. In addition, the pressing portion 18 of the back metal 16 is pushed up by the upper pressing portion 24 of the cam body 23 in the protruding state of the blade body 7 and is separated from the lock concave portion 14 of the cam portion 11 of the blade body 7, so that the rotation of the blade body The motion block is released. As described above, the cam body 23 having the original function of restricting the rotation of the blade body 7 and preventing the rotation of the blade body 7 and releasing the rotation is replaced by the blade body 7.
, The respective functions can be realized without increasing the number of parts.

(C) As shown in (b) above, the blade body 7 can be easily pulled out from the holder 1, so that the entire blade body 7 can be stored in the holder 1 and the width of the entire knife in the blade body storage state can be reduced. Can be smaller.

In addition to the above embodiment, the following configuration may be adopted. (B) In the above-described embodiment, one cam body 23 has a back metal 1
Upper contact portion 24 for blade 6 and lower press contact portion 25 for blade body 7
Are provided integrally with each other, but the cam body having the upper pressing portion and the cam body having the lower pressing portion are separately provided and linked to each other.

(B) In the above-described embodiment, the cam body 23 is rotatable about the support shaft 22, but the cam body is moved in parallel. In this case, the shapes of the pressure receiving portion of the back metal contacting the upper pressing portion of the cam body and the pressure receiving portion of the cam portion of the blade contacting the lower pressing portion of the cam body are changed. .

(C) When the blade body 7 is stored, the back 9 of the blade body 7 is inserted within a range where the entire width of the knife is not increased, except that the entire blade is stored in the holder 1 as in the above embodiment. It is slightly exposed to the outside of the opening 5.

[0025]

According to the blade-body storing knife according to the present invention, the blade body 7 in the stored state is taken out from the holder 1 because the pull-out assist mechanism of the blade body 7 is provided in the positioning mechanism of the blade body 7. Therefore, the entire blade body 7 can be stored in the holder 1 and the knife can be reduced in size.

[Brief description of the drawings]

FIG. 1A is a front view showing a blade body storage state of a blade body storage type knife according to the present embodiment, FIG. 1B is a cross-sectional view of FIG. 1A, and FIG. It is the elements on larger scale front view.

2A is a front view showing a state in which the blade is being pulled out of the blade body storage state of FIG. 1, FIG. 2B is a cross-sectional view of FIG. 2A, and FIG. 2C is a sectional view of FIG. It is a partial enlarged front view.

FIG. 3A is a partially enlarged front view showing a state in which the blade body is further rotated from the blade body pulled-out state in FIG. 2;
(B) is a front view showing the blade body projecting state in the blade body storing knife according to the present embodiment, (c) is a cross-sectional view of (b), and (d) is a partially enlarged front view of (c). FIG.

FIG. 4A is a front view showing a state in which the lock of the blade is unlocked in the state in which the blade is projected in FIGS. 3B, 3C, and 3D;
(B) is a cross-sectional view of (a), (c) is a partially enlarged front view showing a storage halfway state in which the blade is rotated from the state of (b), and (d) is a sectional view of (c). It is the elements on larger scale which show the storage middle state which rotated the blade body further from the state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Holder, 5 ... Blade body insertion / removal opening, 6 ... Blade body protrusion opening part, 7 ...
Blade body, 11: cam portion, 14: lock concave portion as lock portion, 15: pressure receiving portion, 16: backing metal, 18: pressing portion, 19 ...
Pressure receiving part, 21 ... Operation lever as operation part, 23 ... Cam body, 24 ... Upper pressing part, 25 ... Lower pressing part.

Claims (1)

(57) [Claims] 1. A state in which a blade body (7) is rotatably supported with respect to a holder (1), and the blade body (7) is stored in a holder (1) through an insertion opening (5). A state in which the blade (7) protrudes from the opening (6) of the holder (1) is attached. A backing metal (16) having a pressing portion (18) is attached to the holder (1), and the blade body (7) is mounted. ) In the retracted state and the protruding state, respectively, in which the pressing portion (18) is engaged with the cam portion (11) of the blade body (7), and the blade body (11) is detached from the cam portion (11). in blade retractable knife as possible and a state that allows the rotation of the 7), comprises a cam body with the movement of the support the operation section relative to the holder (1) (21) (23), this The cam body (23)
Between the back metal (16) and the cam portion (11) of the blade body (7)
In the retracted state and the protruding state of the blade body (7), respectively .
A position for the engagement with respect to the cam portion (11) of the blade pressing portion (18) of the serial Sekin (16) (7), as well capable of taking a position to the disengaged state, Sekin (16 )
Not only does it have a first pressing part (24) for pressing
Then, the first pressing of the cam body (23) with the blade body (7) in the housed state .
When the pressing portion (18 ) of the back metal (16) is released by the portion (24) , the blade (7) is rotated to hold the holder (1).
Push the blade (7) so that it is exposed from the insertion opening (5).
A blade body positioning mechanism in a blade body retractable knife having a second pressing portion (25) .