JP5390694B2 - Knife - Google Patents

Description

  The present invention relates to a blade formed by detachably attaching a replacement blade to a blade body.

As a blade used for a medical scalpel, a pathological knife, or a razor for face shaving or hair cutting, there is a blade formed by detachably attaching a replacement blade to a blade body.
In such a cutter, the replacement blade is attached to the blade body by inserting the replacement blade into a groove provided in the blade body. And a replaceable blade can be replaced | exchanged for every predetermined use frequency and every use period.

  As such a replaceable blade type blade, a blade body that engages the replaceable blade with the tip portion, a holding member that presses and holds the replaceable blade from a surface opposite to the blade body, and the blade body together with the holding member are covered. Some have a cover (Patent Document 1). In this blade, the cover is held so as to be slidable in the longitudinal direction with respect to the blade body, and by sliding the cover to a predetermined position, the holding member is pressed toward the blade body to be elastically deformed, and the holding member is The replacement blade is fixed to the blade body.

International Publication No. 2009/074863 Pamphlet

  However, in the conventional blade, since the holding member is pressed against the replacement blade and the replacement blade is fixed by sliding the cover, there is a possibility that the holding member may be displaced as the cover slides. It is also conceivable that the blade is displaced. That is, if the holding member is not securely engaged with the blade body, the holding member or the replacement blade will be displaced in the longitudinal direction, and the replacement blade will fail to be mounted.

In addition, even if the cover is slightly deformed, the state in which the replacement blade is mounted may become unstable.
Furthermore, in addition to the replacement blade, the blade described in Patent Document 1 includes four members of the blade body, the holding member, the cover, and a button for sliding the cover with respect to the blade body. Consists of. Therefore, the number of parts is large and the configuration is complicated. In particular, incorporating a holding member to elastically hold the replaceable blade is a major factor in increasing the number of parts.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a cutter capable of easily forming a stable mounting state of a replacement blade with a simple configuration.

The present invention is a blade formed by detachably attaching a replacement blade to the blade body,
The replacement blade has flexibility in the thickness direction,
The blade body is composed of a main body block and a rotation block held on the main body block so as to be rotatable about a rotation axis in a height direction perpendicular to the longitudinal direction and the thickness direction of the blade.
The main body block has a main body support portion that supports the back surface of the replaceable blade, and a main body engagement portion that engages with the replaceable blade from the front surface side,
The rotation block includes a rotation shaft portion that is pivotally supported by the main body block, a pressing portion that presses the rear end portion of the replaceable blade from the front side on the front side of the rotation shaft portion, and the rotation shaft portion. More rear end side, having a rear engagement portion engageable with the main body block,
In the mounted state in which the replacement blade is attached to the blade body, the replacement blade is engaged with the main body engaging portion and is pressed by the pressing portion of the rotating block at the rear end portion. It is elastically deformed to warp in the thickness direction,
The cutter is characterized in that the mounting state is maintained by engaging the rear engagement portion of the rotating block with an engagement holding portion provided in the main body block.

In the cutter according to the present invention, after the replaceable blade is engaged with the main body engaging portion of the main body block, the rear end portion of the replaceable blade is pressed by the pressing portion of the rotating block, thereby mounting the mounting blade. A state can be formed. Here, the pressing portion of the rotating block presses the rear end portion of the replaceable blade as the rotating block rotates around the rotating shaft portion existing behind the pressing portion. That is, when the replacement blade is mounted, the pressing portion comes into contact with and presses the rear end portion of the replacement blade from the thickness direction. Therefore, there is no possibility that the replacement blade is displaced in the operation at the time of mounting.
Therefore, the replacement blade can be easily and reliably attached to the blade body.

  Moreover, in the said mounting state, the said replacement blade is directly pressed down by the rotation block pivotally supported by the main body block, and a rotation block engages with the engagement holding part of a main body block in a back engagement part. Thereby, the said mounting state can be maintained in the stable state. At this time, since the replaceable blade is elastically deformed so as to warp in the thickness direction, the replaceable blade is fixed without play with respect to the blade body, and a stable mounting state can be secured. .

  Further, as described above, the mounting state can be formed by using the elastic force (restoring force) of the replaceable blade. Therefore, there is no need to provide a new member just to prevent play of the replaceable blade in the mounted state. Therefore, the number of parts can be reduced and the configuration can be simplified.

  As described above, according to the present invention, it is possible to provide a cutter capable of easily forming a stable mounting state of a replacement blade with a simple configuration.

The front view of the blade main body and replacement blade which attached the cover in Example 1. FIG. The front view of the cutter in Example 1. FIG. The front view of the cutter in Example 1 when a cover is assumed to be completely transparent. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The bottom view of the cutter in Example 1. FIG. FIG. 3 is a rear view of the blade in the first embodiment. FIG. 3 is a perspective view of the blade in the first embodiment. The front view of a replaceable blade in Example 1. FIG. Sectional drawing of the front-end | tip part of a cutter in Example 1. FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. The front view of the main body block in Example 1. FIG. The bottom view of the main body block in Example 1. FIG. FIG. 3 is a rear view of the main body block in the first embodiment. The front view of the rotation block in Example 1. FIG. The bottom view of the rotation block in Example 1. FIG. The perspective view of the cover in Example 1. FIG. FIG. 17 is a cross-sectional view taken along line CC in FIG. 16. The perspective view of the cutter which arranged the cover in the front position in Example 1. FIG. The front view of the cutter which arranged the cover in the front position in Example 1. FIG. The DD sectional view taken on the line of FIG. FIG. 20 is a cross-sectional view taken along line EE in FIG. 19. The back view of the cutter which arranged the cover in the front position in Example 1. FIG. Explanatory drawing which shows the state which engaged the nail | claw part of the cover in the front engaging groove of the main body block in Example 1. FIG. The perspective view of the cutter in the blade replacement state in Example 1. FIG. Sectional drawing of the cutter in the blade replacement state in Example 1. FIG. Sectional drawing of the front-end | tip part of the cutter in the blade replacement state in Example 1. FIG. The perspective view of the cutter in Example 2. FIG. The front view of the cutter in Example 2. FIG. FIG. 29 is a cross-sectional view taken along line FF in FIG. 28. The front view of the cutter in Example 2 when a cover is completely transparent. The perspective view of the cutter which arranged the cover in the front position in Example 2. FIG. The front view of the cutter which arranged the cover in the front position in Example 2. FIG. The back view of the cutter which arranged the cover in the front position in Example 2. FIG. The perspective view of the cutter in the blade replacement state in Example 2. FIG. Sectional drawing of the cutter in the blade replacement state in Example 2. FIG.

  The blade according to the present invention can be, for example, a medical knife, a pathological knife, a razor for shaving or cutting hair.

The replacement blade has an opening penetrating in the thickness direction, and the main body engaging portion protrudes from the main body support portion to the front side in the thickness direction, and is inserted into the opening portion in the mounted state. In addition, it is preferable to be configured to abut against the tip of the opening.
In this case, the replacement blade can be easily and reliably engaged by the main body engaging portion, and the mounting state can be easily formed.

In addition, the opening is formed on the distal end side and is continuously formed on the distal end side of the distal end side opening and the distal end side opening having a relatively small vertical width in the height direction and the distal end side opening. The main body engaging portion is provided with a pair of cut groove portions cut from both sides in the height direction in parallel with the main body support portion. Thus, in the mounted state, the replacement blade is preferably configured to be engaged with the cut groove portion at the outer edge of the distal end side opening.
In this case, the replacement blade can be easily mounted on the blade body, and a stable mounting state can be realized.

  In this case, for example, the blade can be attached to the blade body as follows. First, the rear engagement portion is removed from the engagement holding portion, and the rotary block is rotated with respect to the main body block, whereby the blade body is brought into a blade replacement state in which the replacement blade can be replaced. Next, the main body engaging portion is inserted into the rear end opening of the replaceable blade. Next, the replacement blade is slid rearward with respect to the blade body, whereby the main body engaging portion is engaged with the distal end side opening of the replacement blade. Next, the rotating block is rotated with respect to the main body block, the rear end portion of the replaceable blade is pressed by the pressing portion, and the replaceable blade is elastically deformed. Thereby, the said mounting state can be formed easily and reliably.

Moreover, it is preferable that the said main body block has a rear-end engaging part engaged with the rear end of the said opening part in the said replacement blade in the said mounting state.
In this case, it is possible to reliably prevent the replacement blade from shifting forward in the mounted state, and to realize a more stable mounted state.

Moreover, it is preferable that the said main body support part inclines so that it may go to the front side of the said thickness direction, so that it goes back.
In this case, when the rear end portion of the replacement blade is pressed by the pressing portion of the rotating block, the replacement blade can be sufficiently elastically deformed. Thereby, the mounting state of the more stable replacement blade can be formed.

The cutter has a cylindrical cover that is slidably attached to the main body block in the longitudinal direction and is open in both the longitudinal directions, and the cover has a front position that covers the replacement blade. It is preferable to be configured to be able to lock at the rear position where the replacement blade is exposed.
In this case, since the cover covers the replaceable blade by locking the cover at the front position, the safety of the user can be ensured and the breakage of the replaceable blade can be prevented.
Further, when the cutter is in use, the cutter can be used smoothly by locking the cover at the rear position.

Further, the main body block is provided with a shaft supporting recess for supporting the rotating shaft portion of the rotating block so as to open to the front side in the thickness direction, and the cover is at least in the rear position. At this time, it is preferable that the opening of the shaft support recess is closed.
In this case, the pivotal support structure of the rotating block with respect to the main body block can be simplified. Further, the rotating block and the main body block can be easily disassembled. Thereby, when the blade is disassembled and cleaned, the work can be performed efficiently.

Further, the cover has a height direction leaf spring biased toward the opposite side of the main body block at one end in the height direction, and a free end of the height direction leaf spring at an inner side in the thickness direction. And the body block is formed from the slide groove portion formed in the longitudinal direction toward the outside in the height direction from the slide groove portion in two places in the longitudinal direction. A front engagement groove and a rear engagement groove, and the claw portion is slidably disposed in the slide groove portion, and the claw portion is engaged with the front engagement groove or the rear engagement groove. It is preferable that the cover is locked at the front position or the rear position, respectively.
In this case, the cover can be easily moved and locked between the front position and the rear position.

  Further, the front engaging groove has a shape that becomes deeper outward in the height direction as it goes rearward, and the claw portion has a shape that is inclined toward the outer side in the height direction as it goes rearward. It is preferable.

  In this case, the cover can be more reliably locked at the front position. That is, when the front engagement groove and the claw portion have the shape as described above, even if the cover is about to move backward with respect to the blade body from the locked state at the front position, the front engagement groove It is difficult to disengage the claw part from the groove. That is, when a force is applied in a direction in which the cover is directed toward the rear of the blade body, a force directed toward the rear of the front engagement groove is applied to the claw portion. At this time, since the claw portion and the front engagement groove have a shape toward the outside in the height direction as they go rearward, the engagement state between the two tends to be deeper. As a result, even if an external force in the direction in which the cover moves backward with respect to the blade body is applied, the engagement state can be prevented from being released by the external force.

  This leads to the effective role of the cover locked in the forward position. That is, for example, when the cutter is accidentally dropped, it may fall from the tip side of the cutter. Moreover, the blade may fall from the blade edge to the back of the user's foot. In this case, the cover first hits the instep of the foot, but if the cover is unlocked due to the impact, the blade body with the replaceable blade attached moves forward with respect to the cover, and the replaceable blade touches the foot. An accident that pierces the instep is also conceivable. In order to prevent such an accident reliably, it is important to secure the lock at the front position of the cover, and the shape of the front engagement groove and the claw portion as described above is an important configuration from this viewpoint. It becomes.

The cover includes a front locking piece and a rear locking piece that are slidably disposed in the slide groove portion before and after the claw portion, and the front locking piece and the rear locking piece are It is preferable that the sliding groove portion is configured to come into contact with one of the wall surfaces on both sides in the height direction.
In this case, backlash in the height direction of the cover with respect to the blade body can be prevented.

Moreover, it is preferable that the said cover has an inward protrusion part protruded inside so that it may contact | abut to the front side surface of a front part rather than the said rotating shaft part in the said rotation block, when it arrange | positions in the said front position.
In this case, in the mounted state, it is possible to prevent rattling of the rotating block in the thickness direction and to further stabilize the mounted state.

The cover is formed by bending a single metal plate into a cylindrical shape, and the metal plate has at least a pair of protruding end portions protruding in the thickness direction , and the pair of protrusions It is preferable that a part of the end edge of the end portion is disposed so as to face each other in a state of biting in the longitudinal direction.
In this case, even if a force is applied in the direction in which the cover is deployed, the pair of projecting end portions opposed to each other in a state of biting into each other can be engaged to prevent the cover from being deployed. Therefore, the strength of the cover can be increased, and even when a large external force is applied, the replacement blade can be protected and the safety of the user can be ensured.

Example 1
A blade according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 7, the blade 1 of this example is a medical knife formed by detachably attaching a replacement blade 3 to a blade body 2.
The replaceable blade 3 has flexibility in the thickness direction X and has an opening 31 penetrating in the thickness direction X as shown in FIG. The opening 31 is formed on the distal end side, and has a distal end opening 32 having a relatively small vertical width w1 in the height direction Z perpendicular to the longitudinal direction Y and the thickness direction X of the blade 1, and the distal end opening 32. The rear end side opening portion 33 is formed continuously on the rear end side and has a vertical width w2 larger than the front end side opening portion 32.

As shown in FIGS. 1 and 3, the blade main body 2 includes a main body block 4 and a rotation block 5 held by the main body block 4 so as to be rotatable about a rotation axis in the height direction Z. FIG. 3 is an explanatory front view of the blade 1 that can be seen when a cover 6 (see FIG. 2) described later is a complete transparent body.
As shown in FIGS. 9 to 12, the main body block 4 is supported by a main body support portion 41 that supports the back surface of the replaceable blade 3, and protrudes from the main body support portion 41 in the thickness direction X and is cut from both sides in the height direction Z. And a main body engaging portion 42 provided with a pair of cut groove portions 422.

  As shown in FIGS. 3, 14, and 15, the rotation block 5 includes a rotation shaft portion 51 that is pivotally supported by the main body block 4, and a rear end of the replaceable blade 3 on the tip side of the rotation shaft portion 51. The holding part 52 which presses the part 36 from the front side, and the rear engaging part 53 which can be engaged with the main body block 4 are provided on the rear end side from the rotating shaft part 51.

As shown in FIG. 2 to FIG. 7 and FIG. 9, in the mounting state S in which the replaceable blade 3 is mounted on the blade body 2, the replaceable blade 3 has the cut groove 422 of the main body engaging portion 42 at the outer edge of the distal end side opening 32. And is pressed by the pressing portion 52 of the rotating block 5 at the rear end portion 36. Accordingly, as shown in FIG. 9, the replaceable blade 3 is elastically deformed so as to warp in the thickness direction X. That is, the replaceable blade 3 is elastically deformed in a curved state so as to be convex on the front side.
And the mounting state S is maintained by engaging the rear engagement part 53 of the rotation block 5 with the engagement holding part 43 provided in the main body block 4.

As shown in FIG. 8, the replaceable blade 3 is formed by forming a blade 35 on one side in the height direction Z. In this specification, the direction of the side in which the blade 35 is formed in the height direction Z is described as “downward”, and the opposite side is described as “upward”. In the thickness direction X, the side on which the replaceable blade 3 is placed with respect to the blade body 2 is referred to as “front side” and the opposite side is referred to as “back side”.
In addition, a small-width portion 321 having a smaller vertical width in the height direction Z is formed on the distal end side in the distal end side opening 32. A stable engagement state can be obtained by fitting the distal end portion of the main body engaging portion 42 of the main body block 4 into the small width portion 321.

  2 to 7, 18, and 19, the blade 1 is attached to the main body block 4 so as to be slidable in the longitudinal direction Y and is open in both the longitudinal directions Y. Have The cover 6 is configured to be locked at a front position CF (FIGS. 18 and 19) covering the replaceable blade 3 and a rear position CR (FIGS. 2 to 7) exposing the replaceable blade 3.

Further, as shown in FIGS. 3, 9, 11, and 12, the main body block 4 is, in the mounted state S, the rear end engaging portion 47 that engages with the rear end of the rear end side opening 33 in the replaceable blade 3. Have
The main body block 4 in the blade main body 2 is provided with a main body support portion 41 and a main body engaging portion 42 at the front end portion in the longitudinal direction Y, and has a grip portion 44 at the rear end portion.

  The main body support portion 41 and the cut groove portion 422 are inclined so as to go to the front side in the thickness direction X as going back. The main body support portion 41 is formed at a vertical position in the height direction Z of the main body engaging portion 42. Further, on the rear side of the main body engaging portion 42 in the longitudinal direction Y, a raised portion 470 having a surface continuous with the main body support portion 41 is formed. The dimension in the height direction Z of the raised portion 470 is smaller than the dimension w2 in the height direction Z of the rear end side opening 33 of the replaceable blade 3. Therefore, as shown in FIGS. 3 and 9, in the mounted state S, the raised portion 470 can be inserted into the rear end side opening 33 of the replaceable blade 3. Thereby, the rear end side opening 33 of the replaceable blade 3 is engaged with the raised portion 470. That is, the rear end of the raised portion 470 is the rear end engaging portion 47.

  As shown in FIGS. 3, 11, and 13, the main body block 4 is provided with an accommodating portion 45 that accommodates the rotatable block 5 in a rotatable manner inside the height direction Z. The accommodating portion 45 is open to the front side over the entire longitudinal direction Y. In addition, a pair of shaft supporting recesses 451 that support the rotating shaft portion 51 of the rotating block 5 are formed in a part of the housing portion 45 in the vertical direction in the height direction Z. In addition, the housing portion 45 has a housing through portion 452 that is also opened on the back surface side and penetrates in the thickness direction X behind the shaft support recessed portion 451. The main body block 4 is provided with a pair of engagement holding portions 43 above and below in the height direction Z of the housing penetrating portion 452.

On the other hand, as shown in FIGS. 14 and 15, the rotation block 5 is formed by projecting a pair of rotation shaft portions 51 above and below in the height direction Z. Further, the rotating block 5 has a tapered shape in which the width in the height direction Z is gradually reduced at the distal end portion, and the pressing portion 52 is formed by bending the distal end portion toward the back surface side. is there.
Therefore, the pressing of the rear end portion 36 of the replaceable blade 3 by the pressing portion 52 shown in FIGS. 3, 4, and 9 is in a state close to point contact. Further, this pressing point is located below the height direction Z from just behind the main body engaging portion 42. Thereby, the replaceable blade 3 is elastically deformed in a state in which, in addition to the bending in the longitudinal direction Y, the bending (twisting) in the height direction Z is also included.

  If necessary, in order to increase the bending (twisting) in the height direction Z, it is behind the rear end engaging portion 47 in the main body block 4 and behind the center of the main body engaging portion 42. A convex portion protruding to the front side may be provided at a position slightly above the height direction Z (not shown). This convex part abuts against the upper back surface in the height direction Z of the rear end portion 36 of the replaceable blade 3, and in the mounted state S, increases the bending (twist) of the replaceable blade 3 in the height direction Z.

Further, the rear portion 502 of the rotating block 5 is constituted by a frame-shaped portion 54 formed inside with a hollow portion penetrating in the thickness direction X, and the vertical width of the frame-shaped portion 54 varies in the height direction Z. Thus, it can be elastically deformed.
A rear engagement portion 53 is formed so as to protrude in both the height direction Z at a substantially central portion in the longitudinal direction Y of the frame-shaped portion 54.

  As shown in FIG. 3, the blade body 2 is configured such that the rotation block 5 is accommodated in the body block 4 in a state where the rotation shaft portion 51 of the rotation block 5 is disposed in the shaft support recess 451 of the body block 4. Although the shaft support recess 451 is open on the front side, as shown in FIG. 2, when the cover 6 is disposed at the rear position CR, the cover 6 closes the openings of the pair of shaft support recesses 451. Therefore, the pair of rotation shaft portions 51 of the rotation block 5 is held in the shaft support recess 451. Thereby, the rotation block 5 is held in the housing portion 45 of the main body block 4 in a state in which the rotation block 5 can be rotated by a predetermined range around the rotation shaft portion 51.

  Further, in the mounting state S, the turning block 5 is held in the accommodating portion 45 in a state substantially parallel to the main body block 4. That is, when the rear end portion 36 of the replaceable blade 3 engaged with the main body engaging portion 42 of the main body block 4 is pressed by the pressing portion 52 of the rotating block 5, the rear engaging portion 53 of the rotating block 5. Engages with the engagement holding portion 43 of the main body block 4.

  As shown in FIG. 21, the engagement holding portion 43 has a tapered shape that goes inward in the height direction Z as it goes from the front side to the back side in the thickness direction X. On the other hand, the rear engaging portion 53 of the rotating block 5 also has a tapered shape that goes inward in the height direction Z as it goes from the front side to the back side in the thickness direction X. Accordingly, the rear engagement portion 53 is engaged from the back side in the thickness direction X by the engagement holding portion 43.

  Therefore, when the holding portion 52 at the tip of the rotating block 5 receives the reaction force (restoring force) of the replaceable blade 3 and tries to rotate around the rotating shaft portion 51, the rear of the rotating block 5. Although the portion 502 tries to move to the back side with respect to the main body block 4, this movement is prevented by the engagement between the engagement holding portion 43 and the rear engagement portion 53.

  As shown in FIGS. 17 and 24, when the cover 6 is disposed at the rear position CR, the cover 6 opens from the front side toward the entire front portion 501 on the distal end side of the rotation shaft portion 51 in the rotation block 5. It has a movement allowable window portion 65. Further, as shown in FIG. 6, the cover 6 is formed so as not to cover the rear portion 502 of the rotating block 5 when arranged at the rear position CR. At this time, as described above, the cover 6 covers the rotating shaft portion 51.

  Accordingly, as shown in FIGS. 24 and 25, the blade replacement state in which the replacement block 3 can be replaced by rotating the rotation block 5 with respect to the main body block 4 with the cover 6 disposed at the rear position CR. T can be used. That is, when the rotation block 5 is rotated around the rotation shaft portion 51, the front portion 501 including the pressing portion 52 protrudes from the rotation allowable window portion 65 to the front side and includes the frame-shaped portion 54. The rear portion 502 also protrudes to the back side of the main body block 4. Therefore, the cover 6 does not restrict the rotation of the rotation block 5 and allows the rotation by the rotation allowance window portion 65.

As shown in FIGS. 18, 19, and 22, when the cover 6 is disposed at the front position CF, the cover 6 covers the replaceable blade 3, and the cover 6 includes the rotation allowable window portion 65. A plurality of window portions 650 are formed, and these window portions 650 partially open the replaceable blade 3. One of these window portions 650 is a visual recognition window portion 651 configured to open toward the mark 301 engraved on the surface of the replaceable blade 3 and to be visible from the outside.
In addition, from the rotation permissible window part 65 and the window part 650 formed on the back side of the cover 6 so as to oppose the rotation permissible window part 65, in the state where the cover 6 is arranged at the front position CF, the replacement blade 3 Can be visually recognized.

  As shown in FIGS. 16 and 17, the cover 6 has a height direction leaf spring 611 biased upward at the upper end in the height direction Z, and a thickness at the free end of the height direction leaf spring 611. And a claw portion 612 formed inward in the direction X. The height direction leaf spring 611 is biased upward only when the cover 6 is attached to the main body block 4 (see FIGS. 6 and 22).

  Further, as shown in FIG. 13, the main body block 4 is formed from the slide groove portion 460 formed in the longitudinal direction Y and from the slide groove portion 460 toward the outside (upward) in the height direction Z at two places in the longitudinal direction Y. A front engagement groove 461 and a rear engagement groove 462. The claw portion 612 is slidably disposed in the slide groove portion 460, and the claw portion 612 is engaged with the front engagement groove 461 or the rear engagement groove 462, so that the front position CF (FIG. 22). Alternatively, the cover 6 is locked at the rear position CR (FIG. 6).

  As shown in FIG. 23, the front engagement groove 461 has a shape that becomes deeper in the outside (upward) in the height direction Z as it goes rearward, and the claw portion 612 goes outside (in the height direction Z as it goes back). It has a shape inclined toward the upper side.

The cover 6 includes a front locking piece 661 and a rear locking piece 662 that are slidably disposed in the slide groove portion 460 before and after the claw portion 612. In the locked state where the claw portion 612 is engaged with the front engagement groove 461 or the rear engagement groove 462, the front locking piece 661 and the rear locking piece 662 are respectively located on both sides of the slide groove portion 460 in the height direction Z. One of the wall surfaces (lower wall surface 463) and the other (upper wall surface 464) are in contact.
In FIGS. 6, 13, 22, and 23, for convenience, the vertical direction in the height direction Z defined in this specification is reversed.

As shown in FIGS. 17 and 20, the cover 6 protrudes inward so as to come into contact with the front side surface of the front portion 501 rather than the rotation shaft portion 51 in the rotation block 5 when the cover 6 is disposed at the front position CF. An inward protrusion 67 is provided.
The cover 6 is formed by bending a single metal plate into a cylindrical shape. As shown in FIG. 5, the metal plate has at least a pair of projecting end portions 681 projecting in a direction orthogonal to the longitudinal direction Y, and part of the edges of the pair of projecting end portions 681 are in the longitudinal direction Y. It is arranged to face each other in a state of biting into.

Next, the mounting method and the detaching method of the replacement blade 3 in the blade 1 of this example will be described.
When replacing the replaceable blade 3, first, as shown in FIGS. 2 to 7, the cover 6 is disposed at the rear position CR. In this state, the rear portion 502 of the rotating block 5 is strongly pressed to the back side. As a result, the rear engagement portion 53 of the rotation block 5 is disengaged from the engagement holding portion 43 of the main body block 4. That is, when the frame-like portion 54 in the rear portion 502 of the rotating block 5 is strongly pushed to the back side from the state where it is engaged with the engagement holding portion 43, the rear engagement portion 53 is engaged and held by the taper shape of both. It is pressed by the portion 43 and elastically deforms inward. As a result, the engagement state of the rear engagement portion 53 with respect to the engagement holding portion 43 is released, and as shown in FIGS. 24 and 25, the rotation block 5 has the rotation shaft portion so that the rear portion 502 faces the back side. Rotate around 51.

Accordingly, the front portion 501 of the rotation block 5 moves to the front side with respect to the main body block 4. As a result, as shown in FIG. 26, the pressing portion 52 provided at the tip of the rotating block 5 is separated from the rear end portion 36 of the replaceable blade 3, and the replaceable blade 3 that has been elastically deformed is restored.
From this state, the replaceable blade 3 is slid to the front end side of the blade body 2, the rear end side opening portion 33 is disposed at the position of the main body engaging portion 42 of the main body block 4, and the main body engaging portion 42 is opened at the rear end side opening. The replacement blade 3 is removed from the blade body 2 so as to pass through the portion 33.

  Next, when attaching the new replacement blade 3 to the blade body 2, as shown in FIGS. 24 to 26, in the state where the rotation block 5 is rotated and inclined with respect to the body block 4, the body block 4 is inserted into the rear end side opening 33 of the replaceable blade 3, and the back surface of the replaceable blade 3 is disposed on the main body support portion 41. Thereafter, the replaceable blade 3 is slid rearward with respect to the main body block 4 so that the replaceable blade 3 is engaged with the cut groove portion 422 of the main body engaging portion 42 at the outer edge of the distal end side opening portion 32. At this time, since the main body support part 41 and the cut groove part 42 are inclined so as to go to the front side as going back, the replaceable blade 3 is arranged in a posture in which the rear end part 36 is slightly inclined to the front side.

  Next, the rotation block 5 is rotated, and the rear portion 502 is pushed into the housing portion 45 of the main body block 4. Accordingly, as shown in FIGS. 2 to 7, while the frame-like portion 54 is elastically deformed inward, the rear engagement portion 53 is engaged with the engagement holding portion 43 of the main body block 4, and the rotation block 5 is the main body. It becomes a state substantially parallel to the block 4 and is fixed to the accommodating portion 45.

Along with this, the front portion 501 of the turning block 5 is also pushed into the main body block 4 side, and as shown in FIG. 9, the pressing portion 52 presses the rear end portion 36 of the replaceable blade 3 toward the back side. Thereby, the replaceable blade 3 is elastically deformed while being bent so as to be convex on the front side. Then, the rear end of the rear end side opening 33 of the replaceable blade 3 engages with the rear end engaging portion 47 of the main body block 4.
As described above, the mounting state S in which the blade 3 is mounted on the blade body 2 is obtained.

  The replacement blade 3, the main body block 4, the rotation block 5, and the cover 6 are all made of metal such as stainless steel.

Next, the function and effect of this example will be described.
In the cutter 1 of this example, after the replaceable blade 3 is engaged with the main body engaging portion 42 of the main body block 4, the rear end portion 36 of the replaceable blade 3 is pressed by the pressing portion 52 of the rotating block 5. State S can be formed. Here, the pressing portion 52 of the rotating block 5 is configured such that the rotating block 5 rotates around the rotating shaft portion 51 existing behind the pressing portion 52, whereby the rear end portion 36 of the replaceable blade 3. Hold down. That is, when the replaceable blade 3 is mounted, as shown in FIGS. 26 and 9, the pressing portion 52 comes into contact with and presses against the rear end portion 36 of the replaceable blade 3 from the thickness direction X. Therefore, there is no possibility that the replacement blade 3 is displaced in the operation at the time of mounting.
Therefore, the replacement blade 3 can be easily and reliably attached to the blade body 2.

  Further, in the mounted state S, the replacement blade 3 is directly pressed by the rotation block 5 that is pivotally supported by the main body block 4, and the rotation block 5 is engaged with the engagement holding portion 43 of the main body block 4 at the rear engagement portion 53. Match. Thereby, the mounting state S can be maintained in a stable state. At this time, as shown in FIG. 9, since the replaceable blade 3 is elastically deformed so as to warp in the thickness direction X, the replaceable blade 3 is fixed and stabilized without any play with respect to the blade body 2. The wearing state S can be secured.

  Further, as described above, the mounting state S can be formed using the elastic force (restoring force) of the replaceable blade 3. Therefore, there is no need to provide a new member just to prevent play of the replaceable blade 3 in the mounted state S. Therefore, the number of parts can be reduced and the configuration can be simplified.

  Further, the main body engaging portion 42 of the main body block 4 protrudes to the front side in the thickness direction X, is inserted into the opening 31 in the mounted state S, and abuts on the tip of the opening 31. Thereby, the replaceable blade 3 can be easily and reliably engaged by the main body engaging portion 42, and the mounting state S can be easily formed.

  In addition, the opening 31 of the replaceable blade 3 includes a front end side opening 32 and a rear end side opening 33, and the main body engaging portion 42 includes a pair of cut groove portions 422. In the mounted state S, as shown in FIG. 10, the replaceable blade 3 is engaged with the cut groove 42 at the outer edge of the distal end side opening 32. Thereby, the replacement blade 3 can be easily mounted on the blade body 2 and a stable mounting state S can be realized.

Moreover, as shown in FIG. 9, since the main body block 4 has the rear end engaging part 47, in the mounting state S, it is possible to reliably prevent the replaceable blade 3 from shifting forward and to realize a more stable mounting state. it can.
Moreover, the main body support part 41 inclines so that it may go to the front side of the thickness direction X, so that it goes back. Thereby, when the rear end portion 36 of the replaceable blade 3 is pressed by the pressing portion 52 of the rotating block 5, the replaceable blade 3 can be sufficiently elastically deformed. Thereby, the mounting state S of the replaceable blade 3 can be formed more stably.

  Moreover, the cutter 1 has a cover 6, and the cover 6 is configured to be locked at a front position CF (FIGS. 18 and 19) and a rear position CR (FIGS. 2 and 4 to 7). Thereby, since the cover 6 covers the replaceable blade 3 by locking the cover 6 at the front position CF, the safety of the user can be secured and the breakage of the replaceable blade 3 can be prevented. Further, when the cutter 1 is used, the cutter 1 can be used smoothly by locking the cover 6 at the rear position CR.

  Further, as shown in FIGS. 3, 11, and 12, the main body block 4 is provided with an axial support recess 451 that opens to the front side in the thickness direction X. The cover 6 closes the opening of the shaft support recess 451 at least when it is in the rear position CR. Thereby, the shaft support structure of the rotation block 5 with respect to the main body block 4 can be simplified. Moreover, the rotation block 5 and the main body block 4 can be disassembled easily. Accordingly, when the blade 1 is disassembled and cleaned, the work can be efficiently performed.

  As shown in FIGS. 16 and 17, the cover 6 includes a height direction leaf spring 611 and a claw portion 612. On the other hand, as shown in FIG. 13, the main body block 4 includes a slide groove portion 460, a front engagement groove 461, and a rear engagement groove 462. 6 and 22, the claw portion 612 is slidably disposed in the slide groove portion 460, and the claw portion 612 is engaged with the front engagement groove 461 or the rear engagement groove 462. The cover 6 is locked at the front position CF or the rear position CR, respectively. Thereby, the cover 6 can be easily moved and locked between the front position CF and the rear position CR.

Further, as shown in FIG. 23, the front engagement groove 461 has a shape that becomes deeper outward (upward) in the height direction as it goes rearward, and the claw portion 612 has an outer side (in the height direction as it goes rearward). It has a shape inclined toward the upper side.
Thereby, the cover 6 can be locked more reliably at the front position CF.

  That is, if the front engaging groove 461 and the claw portion 612 have the shapes as described above, even if the cover 6 tries to move backward with respect to the blade body 2 from the locked state at the front position CF, the front engaging groove The engagement state of the claw portion 612 with the mating groove 461 is difficult to come off. That is, when a force is applied to the cover 6 in the direction toward the rear of the blade body 2, a force toward the rear of the front engagement groove 461 acts on the claw portion 612. At this time, the claw portion 612 and the front engagement groove 461 have a shape toward the outer side (upward) in the height direction as going back, so that the engagement state of both tends to be deeper. As a result, even when an external force in the direction in which the cover 6 moves backward with respect to the blade body 2 is applied, the engagement state can be prevented from being released due to the external force.

  This leads to the role of the cover 6 locked to the front position CF being effectively played. That is, for example, when the blade 1 is accidentally dropped, it may fall from the tip side of the blade 1. Moreover, the blade 1 may fall from the blade edge onto the back of the user's foot. In this case, the cover 6 first hits the instep, but if the cover 6 is unlocked due to the impact, the blade body 2 with the replacement blade 3 attached to the cover 6 moves forward, An accident in which the replaceable blade 3 pierces the instep is also conceivable. In order to prevent such an accident reliably, it is important to secure the lock at the front position CF of the cover 6, and the shapes of the front engagement groove 461 and the claw portion 612 as described above are based on this viewpoint. It becomes an important composition.

  The cover 6 includes a front locking piece 661 and a rear locking piece 662 on the front and back of the claw portion 612. Then, the front locking piece 661 comes into contact with the lower wall surface 463 in the slide groove portion 460, and the rear locking piece 662 comes into contact with the upper wall surface 462 in the slide groove portion 460. Thereby, the play of the cover 6 with respect to the blade body 2 in the height direction Z can be prevented.

  As shown in FIG. 20, the cover 6 has an inward projecting portion 67 that abuts against the front side surface of the front portion 501 in the rotation block 5 when disposed at the front position CF. Thereby, in the mounting state S, the play of the rotation block 5 in the thickness direction X can be prevented, and the mounting state S can be further stabilized.

  Further, the cover 6 is formed by bending a single metal plate into a cylindrical shape. As shown in FIG. 5, the metal plate has a portion of the edges of the pair of projecting end portions 681. Oppositely arranged in a state of biting in the longitudinal direction. Thereby, even if a force is applied in the direction in which the cover 6 is deployed, the pair of projecting end portions 681 that are opposed to each other in a state of biting into each other can be engaged to prevent the cover 6 from being deployed. Therefore, the strength of the cover 6 can be increased, and even when a large external force is applied, the replaceable blade 3 can be protected and the safety of the user can be ensured.

  As described above, according to this example, it is possible to provide a cutter capable of easily forming a stable mounting state of a replacement blade with a simple configuration.

(Example 2)
In this example, as shown in FIGS. 27 to 35, the pressing portion 52 of the rotating block 5 is an example of the blade 1 having a wide shape in the height direction Z.
In this example, as shown in FIG. 30, the front portion 501 on the front end side of the rotation shaft portion 51 is not provided with a tapered shape at the front end portion of the rotation block 5 as in the first embodiment (see FIG. 14). Is shaped so that the width in the height direction Z is constant. And this front-end | tip part is bent to the back surface side, and the holding | suppressing part 52 is formed. Therefore, the pressing portion 52 is wide in the height direction Z, and the pressing of the rear end portion 36 of the replaceable blade 3 by the pressing portion 52 is close to a line contact having a length in the height direction Z. .

Further, as shown in FIGS. 31 to 34, the cover 6 of the blade 1 of this example has a large number of window portions 650, and the window portions are formed on all four surfaces of the top and bottom in the height direction Z and the front and back in the thickness direction X. 650 is formed.
Also in this example, as shown in FIGS. 34 and 35, the rotation block 5 can be rotated with respect to the main body block 4 with the cover 6 locked at the rear position CR. Thereby, the replacement blade 3 can be easily replaced in the same manner as in the first embodiment.

  In addition, although there is a slight difference in the shape of each component, the main configuration is the same as that of the first embodiment. In addition, the code | symbol attached | subjected to FIGS. 27-35 shows the site | part etc. which have the function and structure similar to what was attached | subjected to Example 1. FIG.

In the case of this example, since the pressing of the replaceable blade 3 by the pressing portion 52 is in line contact as described above, a more stable mounting state S can be obtained.
Further, since the cover 6 is provided with the window portions 650 on all four surfaces, the cleaning liquid can easily enter the inside of the cover 6 when the blade 1 is cleaned, and more efficient cleaning is possible.
In addition, the same effects as those of the first embodiment are obtained.

Claims (12)

A blade formed by detachably attaching a replacement blade to the blade body,
The replacement blade has flexibility in the thickness direction,
The blade body is composed of a main body block and a rotation block held on the main body block so as to be rotatable about a rotation axis in a height direction perpendicular to the longitudinal direction and the thickness direction of the blade.
The main body block has a main body support portion that supports the back surface of the replaceable blade, and a main body engagement portion that engages with the replaceable blade from the front surface side,
The rotation block includes a rotation shaft portion that is pivotally supported by the main body block, a pressing portion that presses the rear end portion of the replaceable blade from the front side on the front side of the rotation shaft portion, and the rotation shaft portion. More rear end side, having a rear engagement portion engageable with the main body block,
In the mounted state in which the replacement blade is attached to the blade body, the replacement blade is engaged with the main body engaging portion and is pressed by the pressing portion of the rotating block at the rear end portion. It is elastically deformed to warp in the thickness direction,
The blade characterized by maintaining the said mounting state by engaging the said back engagement part of the said rotation block with the engagement holding part provided in the said main body block.   2. The blade according to claim 1, wherein the replacement blade has an opening penetrating in the thickness direction, and the main body engaging portion protrudes from the main body support portion to the front side in the thickness direction, and in the mounted state. A blade characterized by being inserted into the opening and configured to abut against the tip of the opening.   3. The blade according to claim 2, wherein the opening is formed on a distal end side and is continuously formed on a distal end side opening portion having a relatively small vertical width in the height direction and a rear end side of the distal end side opening portion. And a rear end side opening portion having a larger vertical width than the front end side opening portion, and the main body engaging portion is cut in parallel to the main body support portion from both sides in the height direction. A cutting tool characterized in that, in the mounted state, the replaceable blade is configured to be engaged with the cut groove at the outer edge of the distal end side opening.   4. The blade according to claim 2, wherein the main body block has a rear end engaging portion that engages with a rear end of the opening in the replacement blade in the mounted state.   The cutter according to any one of claims 1 to 4, wherein the main body support portion is inclined so as to go to the front side in the thickness direction as going back.   The blade according to any one of claims 1 to 5, further comprising a cylindrical cover that is slidably attached to the main body block in the longitudinal direction and that is open in both the longitudinal directions. Is configured such that it can be locked at a front position covering the replacement blade and a rear position exposing the replacement blade.   The blade according to claim 6, wherein the main body block is provided with a shaft supporting recess that supports the rotating shaft portion of the rotating block so as to open to the front side in the thickness direction, and the cover is The blade is configured so as to close the opening of the shaft support recess when at least in the rear position.   The blade according to claim 6 or 7, wherein the cover includes a height direction leaf spring biased toward one end in the height direction toward the side opposite to the main body block, and the height direction leaf spring. A claw portion formed at the free end toward the inside in the thickness direction, and the main body block includes a slide groove portion formed in the longitudinal direction and the height from the slide groove portion at two locations in the longitudinal direction. A front engagement groove and a rear engagement groove formed outward in the direction, and the claw portion is slidably disposed in the slide groove portion, and the front engagement groove or the rear engagement groove. A cutter characterized in that the cover is locked at the front position or the rear position by engaging the claw portion with a groove.   9. The blade according to claim 8, wherein the front engagement groove has a shape that becomes deeper outward in the height direction as it goes rearward, and the claw portion goes outward in the height direction as it goes rearward. A blade having a shape inclined toward the surface.   The cutter according to any one of claims 6 to 9, wherein the cover includes a front locking piece and a rear locking piece that are slidably disposed in the slide groove portion before and after the claw portion, A cutting tool, wherein the front locking piece and the rear locking piece are configured to contact one and the other of the wall surfaces on both sides in the height direction of the slide groove portion, respectively.   The cutter according to any one of claims 6 to 10, wherein the cover is in contact with a front side surface of a front portion of the rotating block when the cover is disposed at the front position. A cutter having an inward protruding portion protruding inward. The cutter according to any one of claims 6 to 11, wherein the cover is formed by bending a single metal plate into a cylindrical shape, and the metal plate protrudes in the thickness direction . A cutter having at least a pair of projecting end portions, and a part of edges of the pair of projecting end portions are opposed to each other in a state of biting in the longitudinal direction.

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