JP4766419B2 - Knife - Google Patents

Description

The present invention relates to a blade such as a razor in which a blade body which is a replacement blade is detachably attached to a blade body. This type of blade is used for razors for face shaving and hair cutting, knives for medical use and pathology.

A blade with a metal back metal blade attached to the blade body may have a gap between the blade (blade) and the blade body due to dimensional errors during manufacturing or changes over time. is there. The blade body is removably inserted into and removed from the blade body through the insertion / removal port at the front end, but the blade body held in the blade body (hollow part) may be loosened due to wear caused by the insertion / removal of the replacement blade. is there. Taking a razor as an example, a leaf spring, which is an elastic body, is disposed in the hollow portion of the blade body, while the replaceable blade mounted on the hollow portion is pressed by the urging force of the leaf spring in contact with the blade, and the replaceable blade is A structure that is stably held has been developed. In this case, the base end of the leaf spring is fixed to the blade body in order to prevent unnecessary movement of the leaf spring in the hollow portion. As a fixing means, for example, there is a structure in which a base end of a leaf spring is sandwiched and fixed between members in the blade body (see Japanese Utility Model Publication No. 11778). Further, there is known a structure (not shown) in which a small protrusion at the base end of a leaf spring is hooked and fixed from the inside to a small hole penetrating in the thickness direction of the blade body. However, the thickness of the small hole is about 1 mm, and only a small protrusion is hooked on this thin thickness portion. On the other hand, when attaching and detaching the replacement blade and the blade body, the replacement blade is moved in the longitudinal direction of the blade body.At this time, the replacement blade slides on the leaf spring and a longitudinal force acts on the leaf spring. In the conventional fixing means, the leaf spring may be detached due to aging.
As described above, Japanese Utility Model Publication No. 11778 discloses a razor in which a base end of a leaf spring is sandwiched between members in a blade body and the leaf spring is fixed to the blade body.

An object of the present invention is to stably hold a leaf spring disposed in a blade body and to provide an effective blade for aged use. It is another object of the present invention to provide a blade that can easily and reliably attach a leaf spring to a blade body.

In order to solve the above problems, the blade according to the present invention takes the following means. That is, the blade body can be inserted into and removed from the blade body, and the blade body mounted on the blade body holding portion of the blade body is pressed by the urging force of the leaf spring. An engagement recess that has an engagement recess that opens at the edge, and that the leaf spring is provided with an engagement projection that extends and bends toward the engagement recess at the base end. Is covered by the covering body, while the engaging recess is formed in the direction orthogonal to the extending direction of the side surface portion in the groove portion and is formed over the entire thickness direction of the side surface portion, and the blade is moved by moving the blade body in the front-rear direction. When a longitudinal force is applied to the leaf spring that is in sliding contact with the body, the curved state of the leaf spring that is generally curved in an arcuate shape is deformed, and the engagement protrusion provided at the base end of the leaf spring that changes the curved state. One side is the inner surface of the engaging recess facing the front and the rear is facing Each inside surface of Rukakarigo recess is engaged with the almost exclusively movably engaging recesses in the front-rear direction so as to surface contact. Moreover, a pair of engagement recessed part is formed in series in the side part which opposes, and an engagement protrusion is engaged with any one engagement recessed part. And the blade can be a razor.

According to the blade according to the present invention, for example, compared to a conventional razor in which a small protrusion of a leaf spring is hooked into a small hole penetrating from the inside of a narrow groove to a side surface, to a blade body of a leaf spring including an engagement protrusion. Is easy and reliable, and is stably held on the blade body. Accordingly, the leaf spring does not move away from the predetermined position due to sliding of the blade body in the blade body, and can withstand long-term use.

The best mode for carrying out the present invention will be described for a razor. The razor 1 includes a blade body 2 and a handle 3. Here, the razor handle 3 is an elongated handle part that is held by the hand of the razor 1, and the razor blade body 2 is a cutting tool that is a basic part of the blade connected to the handle 3. The blade body is configured by attaching the blade body 5 to the blade body 2. That is, the blade body 2 includes not only the blade body holding portion C that holds the blade body 5 but also all the parts such as the base portion D that are integrally formed therewith. The blade body 2 is usually made of metal, but is not limited thereto.

The blade body 2 includes a front end insertion / removal port 7 through which the blade body is inserted and removed, and a blade body holder C extending from the blade body insertion / removal port 7 in the longitudinal direction of the blade body. The blade body holding portion C is provided with a pair of side surface portions 9a, 9a, and there is a gap between the lower edges 8a, 8a of the opposing side surface portions (the “lower edge” of the side surface portions refers to the lower side in FIG. 3). That is, the blade body holding part C has a hollow structure in which the lower edge side of the opposing side part is opened. The blade body 2 includes a base D connected to the blade holder C, and a groove E is formed in the base D in the longitudinal direction. The groove portion E has a pair of side surface portions 9b, 9b and a bottom portion 4 which are parallel to each other. Like the blade body holding portion C, the groove portion E has a hollow structure in which the lower edges 8b, 8b open between the side surface portions 9b, 9b. The body holding part C and the hollow groove part E are connected.

In the hollow blade body holding portion C, a single leaf spring A, which is an elastic body, is disposed in the longitudinal direction of the blade body 2. The bent spring A is held or fixed at the base body 2 by the base end, and the central portion is appropriately elastically in contact with the inner side surface of one side surface portion 9a of the blade body holding portion C (see FIG. 6). The blade body 5 inserted into the blade body holding portion C from the insertion / removal port 7 at the front end slides along the side surface of the leaf spring A from the front end 10 side to the base end side of the leaf spring A and is disposed at a predetermined position. The The blade body 5 in the hollow blade body holding portion C is pressed in the direction of the one side surface portion 9a by the urging force of the leaf spring A contacting the abdomen, and is stably disposed on the blade body holding portion C (see FIG. 6, 7, 8). Further, the blade body 5 arranged in the blade body holding portion C is moved to the front end 10 side and taken out from the insertion / removal port 7. Thus, the blade body 5 which is a replacement blade is detachably mounted on the blade body 2, and the blade edge 5 a of the mounted blade body 5 protrudes from the lower edge 8 a of the side surface portion of the blade body holding portion.

As a whole, the leaf spring A curved in a substantially arcuate shape has an engagement protrusion 6 that bends and extends at the proximal end. The engagement protrusion 6 is formed integrally with the leaf spring A. For example, the width of the engagement protrusion is the same as the width of the leaf spring as in the case of the leaf spring rod 1 (here, the “width of the engagement protrusion”). The “width” of the leaf spring means the length in the height (up and down) direction in FIG. 9). However, the widths need not always be the same and may be different. A plurality of engaging protrusions may be provided instead of only one, and the setting position at the base end of the leaf spring is also arbitrary. The plate spring A2 shown in FIGS. 11 to 13 has a pair (two pieces) of engaging protrusions 6 and 6 on the upper edge side and the lower edge side of the base end. Further, the leaf spring A3 shown in FIGS. 14 to 16 has one engagement protrusion 6 at a substantially intermediate portion in the width direction at the base end. In any case, the width of the engaging protrusion is at least one third of the width of the base end of the leaf spring, preferably at least one half. When a plurality of engagement protrusions 6 are provided, the width of each engagement protrusion is added so that the same condition is satisfied. Thereby, engagement with the engagement protrusion 6 and the engagement recessed part B is stabilized.

The leaf spring A4 shown in FIGS. 17 and 18 has an engagement protrusion 6 that extends and bends in an L shape at the base end, and the leaf spring A5 shown in FIGS. 19 and 20 is bent in a hook shape at the base end. The engaging piece 6 is extended. The leaf spring A6 shown in FIGS. 21 and 22 has an engaging protrusion 6 that bends downward from the lower end of the base end portion 13 that extends linearly. The length, bending angle, direction, and the like of the engagement protrusion 6 are appropriately determined depending on the arrangement relationship with the engagement recess B and the like. The overall shape of the leaf spring A, which is an elastic body, is not limited to an arcuate shape, but may be a trapezoidal shape, an S shape, a wave shape, or the like. The material is preferably a metal, but may be an amorphous material or plastic.

The blade body 2 is formed with an engagement recess B in the height direction (vertical direction in FIG. 3), and the engagement recess opens at the lower edge of the blade body. An engagement recess B is formed in the groove E of the base D in the blade body 2 including the blade body holding part and the base. That is, the groove portion E provided in the longitudinal direction of the base portion D includes the side portions 9 b and 9 b and the bottom portion 4 that face each other, and the engaging recess B is formed in the side portion 9 b or the bottom portion 4. In the case of the engaging recess B in the side surface portion 9b, the side surface portion 9b is notched in the thickness direction, and a pair of engaging recess portions B are formed in series on the opposing side surface portions 9b and 9b (see FIGS. 6 and 23). . The engaging recess B is a direction orthogonal to the extending direction of the side surface portion 9b and is formed over the entire area in the thickness direction of the side surface portion 9b, but the formation direction and angle are arbitrary. 24 is formed by cutting out a part in the width direction from the inside of the groove E. The engaging recess B may be formed only on one side surface (not shown).

The engaging recess B is engaged with a bending engaging protrusion 6 provided at the base end of the leaf springs A1 to A3 (see FIG. 23). The engagement protrusion 6 bends and extends toward the engagement recess B in one side surface portion 9b. It is desirable that the engaging protrusion 6 engaged with the engaging recess B does not protrude from the outer surface 9c of the side surface portion 9b, and is in a substantially flush state or a state close thereto (see FIG. 23). However, the tip of the engagement protrusion 6 may not reach the outer surface, and conversely, may protrude from the outer surface (see the description of engagement between the leaf springs A4, 5 and the engagement recess B described later). When the engagement recess B is formed in the direction perpendicular to the extending direction of the side surface portion 9b and over the entire thickness direction of the side surface portion 9b (see FIG. 23), the engagement protrusion 6 and the engagement recess B Is easy and stable. The interval in the front-rear direction of the engagement recess B may be a length sufficient to engage the thin plate-like engagement protrusion 6 or slightly longer than that, and about 1 mm to 2 mm is sufficient (plate Springs A1 to A5). In addition, when the blade body is made of metal, it is easy to form the engagement recesses in the blade body by a mechanical method, such as arranging a plurality of blade bodies in parallel and cutting both side surfaces 9b of the groove portion in the thickness direction. is there. In addition, when a pair of engagement recessed part B is formed in the side part which opposes, the engagement protrusion A of the leaf | plate spring A (in the case of 1 sheet) is engaged with any one engagement recessed part B. FIG.

The engaging recess B extends from the lower edge 8b of the side surface to the bottom 4 of the groove E, and is formed vertically. The cross section of the engaging recess B is rectangular and has the same size. However, the cross-sectional shape and size may be partially different, and the engaging recess may be formed in an inclined shape (not shown). The widths of the leaf spring A and the mating protrusion 6 are preferably substantially the same as or slightly smaller than the depth of the engaging recess B (the length from the lower edge 8b of the side surface portion to the bottom portion 4 of the groove portion) (see FIG. 28). It may be large (not shown). In the plate springs A2 and A3 shown in FIGS. 29 and 30, the width of the engagement protrusion 6 is considerably smaller than the depth of the engagement recess B. The bottom 4 of the groove is substantially planar (see FIG. 4), but may be a curved surface (not shown). Moreover, it is good also as an inverted V-shaped bottom part where the center part became lower than both inner edge 14a like the bottom part 14 of the blade holding | maintenance part C.

Further, the engagement protrusion B is engaged with an engagement protrusion 6 that is bent in the shape of a flange of the leaf spring A4 (see FIG. 25), and the engagement protrusion B is engaged with an engagement protrusion that is bent in the L shape of the leaf spring A5. The piece 6 is engaged (FIG. 26). These are examples in which the front end portion of the engaging protrusion 6 protrudes from the outer side surface 9c of the side surface portion. In this case, the engaging protrusion 6 bends and extends to the outer side surface 9c of the side surface portion, and the front end portion that contacts the outer side surface 9c is further bent toward the front end side of the blade body 2 by the leaf spring A4, and the leaf spring A5. Then, it is further bent toward the base end side of the blade body 2. In any case, the engagement protrusions 6 are securely engaged so as not to be disengaged from the engagement recesses B.

Next, in the case of the engaging recess B in the bottom 4 of the groove, the engaging recess B recessed in the bottom 4 is formed in a horizontally long slit shape parallel to one side surface portion 9b of the groove (see FIGS. 27 and 31). . In the engaging recess B at a position close to one side surface portion 9b, the engaging protrusion 6 of the leaf spring A6, that is, the engaging protrusion extending from the base end portion 13 where the leaf spring A6 extends is bent downward. 6 is engaged. As described above, in any case, the engaging recess B formed in the height direction opens at the lower edge of the blade body 2 such as the lower edge 8b or the bottom 4 of the side surface.

The leaf spring A is inserted into the blade body 2 from the opening at the lower edge of the blade body. That is, a leaf spring A that is curved is disposed at a position below the longitudinal opening between the lower edges (8a, 8a and 8b, 8b) of the blade body holding part C and the base part D (see FIG. 3), and the curved state is partially The leaf spring A is inserted into the hollow blade holder holding part and the groove part through the opening while making appropriate adjustments such as deformation (straightening). At the same time, when the engagement protrusion 6 is inserted into the engagement recess B, the engagement protrusion 6 is engaged with the engagement recess B. When there is a pair of engaging recesses B on the side surface portions 9b, 9b, the engaging protrusions 6 may be engaged with either one of the engaging recesses B as described above. The front end 10 (free end) of the leaf spring A disposed in the blade body holding portion C is in contact with the inner surface of the blade body holding portion C. In any case, the engaging protrusion 6 is engaged through the opening from the lower edge side of the blade body 2 with respect to the engaging recess B that opens at the lower edge of the blade body 2 (the lower edge 8b, the bottom portion 4 and the like of the side surface portion), Engagement between the engagement protrusion 6 and the engagement recess B is facilitated. In particular, when the engagement protrusion 6 is engaged with the engagement recess B of the bottom portion 4, when the base end portion 13 of the leaf spring 6 is inserted into the hollow groove E, the engagement protrusion 6 that is bent downward and extends substantially It automatically engages with the engagement recess B, and the engagement is even easier.

The blade body 5 moves in the longitudinal direction (front-rear direction) of the blade body 2 and is inserted into and removed from the blade body holding portion C, but a plate that is in sliding contact with the abdominal surface of the blade body 5 as the blade body 5 moves in the front-rear direction. A force in the front-rear direction acts on the spring A. On the other hand, the engagement protrusion 6 engaged with the engagement recess B abuts on the engagement recess B to prevent the leaf spring from moving in the front-rear direction. In this example, the engagement protrusion 6 is in surface contact with the engagement recess B when the engagement protrusion 6 is disposed in the thickness direction of the side surface portion 9b (see plate springs A1 to A5 and FIGS. 23 to 26). That is, the front surface of the engaging protrusion 6 is substantially in contact with the inner surface of the engaging recess B facing the front surface and the inner surface of the engaging recess B facing the front surface. At least along with the movement of the blade body 5 in the front-rear direction, when a force in the front-rear direction is applied to the leaf spring A, the two are almost in surface contact (see FIG. 8). When the width of the engagement protrusion 6 is the same as the width of the leaf spring (leaf springs A1, A4, A5), the engagement protrusion 6 receives the force in the front-rear direction almost uniformly and the leaf spring A is stable. Held. Further, the contact area between the engagement protrusion 6 and the engagement recess B is large, and the movement of the leaf spring A is effectively prevented.

Next, when the engagement protrusion 6 is disposed in the front-rear direction of the slit-shaped engagement recess B (see the leaf spring A6, FIG. 27), the engagement protrusion 6 is in line contact with the engagement recess B. is there. The engagement protrusion 6 has an inner surface of the engagement recess B facing the linear front portion extending in the vertical direction and an inner surface of the engagement recess B facing the linear rear portion extending in the vertical direction. Line contact almost entirely. Also in this case, a large force in the front-rear direction can be dealt with by line contact, and the leaf spring A is stably held. In addition, although the above demonstrated the case where the number of leaf | plate springs A was one, the number of leaf | plate springs A may be sufficient. For example, a pair of arcuate leaf springs A1 are arranged on the blade holder C so as to face each other so that their convex curved surfaces come into contact with each other, and are inserted from between the front ends that are free ends of both leaf springs A1. The blade body is pressed and clamped between the two leaf springs A, and the respective engagement protrusions 6 are engaged with the opposing engagement recesses B (not shown).

The handle 3 has a mounting opening 20 at the front end and a hollow portion 21 continuous therewith. The blade body 2 to which the leaf spring A is attached is integrated with the base D fixed to the handle 3. As a fixing method, the base D of the blade main body is inserted into the hollow portion 21 of the handle from the attachment port 20, and the blade main body 2 is inserted into the handle 3. Alternatively, the base D of the blade main body inserted into the hollow portion 21 of the handle can be fixed to the handle 3 by an adhesive or ultrasonic welder processing, and the blade main body 2 can be fixed to the handle 3. It doesn't matter.

The engagement protrusion 6 at the opening of the engagement recess B is covered with a cover. In the case of FIGS. 1 and 2, in the blade body integrated with the handle 3 made of synthetic resin or the like, the inner peripheral surface 22 of the hollow portion 21 of the handle closes the opening of the engagement recess B, and the handle 3 The engaging protrusion 6 in the opening is covered. The engaging protrusion 6 is preferably in contact with the covering 3, but there may be a gap between them. For example, in the case of the engagement protrusion 6 of the leaf spring A3, a gap is generated between the cover and the engagement protrusion 6 (see FIG. 30). When an adhesive, a filler, or the like is disposed between the covering body and the engaging protrusion 6 and closes the opening of the engaging recess B, the adhesive or the filler becomes the covering body. Further, the outer periphery of the groove E is wound with a belt-like material such as a belt or tape to close the opening of the engaging recess B, or the opening of the engaging recess is covered with a plate-like material (not shown). In this case, the belt-shaped object or the plate-shaped object is a covering that covers the engaging protrusion 6. A part of the engaging protrusion may protrude outward from the opening of the engaging recess, and at this time, the engaging protrusion is covered with an appropriate covering such as a strip or plate (not shown). . In any case, the covering 3 prevents the engagement protrusion 6 from being detached from the opening of the engagement recess B.

When the cover that closes the opening of the engagement recess B is the handle 3, the engagement protrusion 6 in the engagement recess B can be formed simply by connecting the blade body 2 to the handle 3 and integrating them. Coated and efficient coating is possible. In the case of the handle 3 formed of a transparent material, it is advantageous because the engagement recess B and the engagement protrusion 6 are not visually recognized from the outside by the handle 3 of the cover. However, in the case of the handle 3 formed of a transparent material, even if the narrow opening of the engaging recess B is visually observed, it is not necessarily unnatural. However, if the engagement protrusions are covered with a covering such as a strip or plate, the appearance is surely eliminated. The present invention is not limited to a fixed razor (see FIG. 1) in which the blade body 2 is fixed and integrated with the handle 3, but also a folding razor, that is, the base of the blade body is pivoted near the tip of the handle. The present invention is also applied to a razor (not shown) that is worn and stored in a handle storage part so as to be foldable in the blade body.

As described above, the engagement protrusion 6 engaged with the engagement recess B is in contact with the engagement recess B or the function of preventing movement of the leaf spring in the front-rear direction by the contact possibility, and the covering body. The leaf spring A is stably held on the blade body 2 by the function of preventing the leaf spring from moving in the height direction. Although a razor has been described as one of the most suitable embodiments, the present invention can be applied to blades such as a cutter knife, a medical knife, and a pathological knife (for example, a trimming knife).

  It is a side view of a razor which is one of the blades concerning the present invention.   It is sectional drawing of the razor which shows the replacement blade which moves to an arrow direction.   It is an exploded view of the razor in FIG. 1 which shows a blade body, a leaf | plate spring (side surface), a blade body, and a handle | steering-wheel (cross section).   FIG. 4 is an enlarged front view of the blade body shown in FIG. 3.   It is sectional drawing of the blade main body which shows the state by which the leaf | plate spring is mounted | worn.   It is a bottom view of the blade main body which shows the state by which the leaf | plate spring is mounted | worn.   It is an explanatory bottom view of the principal part of a razor which shows the state which the front edge of a replaceable blade and a leaf | plate spring is contacting.   It is explanatory bottom view of the principal part of a razor which shows the state which the replaceable blade and the abdominal part of a leaf | plate spring are contacting.   It is an enlarged side view of leaf | plate spring A1.   It is an enlarged plan view of the leaf spring.   It is an enlarged side view of leaf | plate spring A2.   It is an enlarged plan view of the leaf spring.   It is a partial expansion perspective view of the leaf spring.   It is an enlarged side view of leaf | plate spring A3.   It is an enlarged plan view of the leaf spring.   It is a partial expansion perspective view of the leaf spring.   It is an enlarged side view of leaf | plate spring A4.   It is an enlarged plan view of the leaf spring.   It is an enlarged side view of leaf | plate spring A5.   It is an enlarged plan view of the leaf spring.   It is an enlarged side view of leaf | plate spring A6.   It is an enlarged plan view of the leaf spring.   It is a partial expanded bottom view of the blade main body which shows the engagement state of leaf | plate spring A1, 2, 3 and an engagement recessed part.   It is a partial expanded bottom view of the blade main body which shows the engagement state of leaf | plate spring A1, 2, 3 and another engagement recessed part.   It is a partial expanded bottom view of the blade main body which shows the engagement state of leaf | plate spring A4 and an engagement recessed part.   It is a partial expanded bottom view of the blade main body which shows the engagement state of leaf | plate spring A5 and an engagement recessed part.   It is a partial expanded bottom view of the blade main body which shows the engagement state of leaf | plate spring A6 and an engagement recessed part.   It is a partial expanded sectional view of the blade main body which shows the engagement state of leaf | plate spring A1 and an engagement recessed part.   It is a partial expanded sectional view of the blade main body which shows the engagement state of leaf | plate spring A2 and an engagement recessed part.   It is a partial expanded sectional view of the blade main body which shows the engagement state of leaf | plate spring A3 and an engagement recessed part.   It is a partial expanded sectional view of the blade main body which shows the engagement state of leaf | plate spring A6 and an engagement recessed part.

Explanation of symbols

A Leaf spring B Engaging recess C Blade body holding part D Base E Groove part 1 Blade 2 Blade body 3 Handle (cover)
DESCRIPTION OF SYMBOLS 5 Blade body 6 Engagement protrusion 7 Inserting / removing port 8a Lower edge 8b of side part of blade body holding part 8b Lower edge of side part of groove part 9a Side surface part of blade body holding part 9b Side surface part of groove part 20 Mounting port 21 Handle opening Hollow part

Claims (3)

The blade body can be inserted into and removed from the blade body, and the blade body mounted on the blade body holding portion of the blade body is pressed by the biasing force of the leaf spring. The leaf spring has an engagement protrusion that is bent toward the engagement recess and extends toward the engagement recess, and the engagement protrusion that is inserted through the opening and engaged with the engagement recess is provided at the base end. On the other hand, the engaging recess is formed in the direction perpendicular to the extending direction of the side surface portion in the groove portion and is formed over the entire thickness direction of the side surface portion, and the blade body is moved in the front-rear direction. When a longitudinal force is applied to the leaf spring that is in sliding contact with the leaf spring, the bent state of the leaf spring that is substantially bow-shaped is deformed, and the engagement protrusion provided at the base end of the leaf spring that changes the bent state Is the engagement of the inner surface and the rear surface of the engaging recess facing the front. Knives engaged and movably engaging recesses in the front-rear direction so as to substantially entirely surface contact respectively on the inner surface of the concave portion. 2. The blade according to claim 1, wherein the pair of engaging recesses are formed in series on opposite side portions, and the engaging protrusion is engaged with one of the engaging recesses. The blade according to claim 1 or 2, wherein the blade is a razor.

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