JP5415213B2 - 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 razor for face shaving and hair cutting, a knife for medical treatment, and a pathology, there is a blade formed by detachably attaching a replacement blade to the 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.

  However, there is a case where a gap is generated between the blade and the blade body due to a dimensional error or a secular change at the time of manufacture, and a sufficient clamping force may not be obtained. The replacement blade is removably inserted into and removed from the groove portion of the blade body through the insertion / removal opening at the tip, but the holding force of the replacement blade by the blade body may be loosened due to wear caused by the insertion / removal of the replacement blade.

  Therefore, as shown in FIGS. 8 to 10, a razor 9 is proposed in which a leaf spring 94, which is an elastic body, is disposed in the groove 921 of the blade body 92 (see Patent Documents 1 and 2). Thereby, the replaceable blade 93 attached to the groove portion 921 is pressed in the thickness direction by the urging force of the leaf spring 94 abutting on the replaceable blade 93, and the replaceable blade 93 is stably held. In this case, in order to prevent the longitudinal displacement of the leaf spring 94 in the groove 921, the engagement protrusion 943 provided at the base end of the leaf spring 94 is engaged with the engagement recess 922 provided in the blade body 92. .

Japanese Utility Model Publication No. 45-11778 JP 2006-255379 A

However, the conventional razor 9 requires the leaf spring 94 as described above. That is, in addition to the blade main body 92 and the replacement blade 93, it is necessary to arrange the leaf spring 94 in the groove portion 921 as a separate member. Therefore, there are problems that the number of parts increases, the assembly process increases, and the cost increases. Moreover, since it is necessary to provide the engagement recessed part 922 in the blade main body 92, there also exists a problem that a man-hour increases.
On the other hand, in order to hold the replaceable blade 93 only by the elastic force of the blade body 92, it is necessary to reduce the width of the groove 921 in advance. In this case, it is difficult to mount the replaceable blade 93. Become.

  The present invention has been made in view of such problems, and is intended to provide a low-cost blade with excellent replacement blade mounting ability and a small number of parts.

The present invention is a blade formed by detachably attaching a replacement blade to the blade body,
The blade body is an integral part, and has a groove that opens at one end in the height direction perpendicular to the longitudinal direction and the thickness direction and also opens at the distal end in the longitudinal direction,
The replacement blade is disposed in the groove so as to expose the blade edge,
The pair of wall portions constituting the side walls of the groove portion are biased in the direction in which the opening side end portions in the height direction approach each other, and the replacement blade is sandwiched by the pair of wall portions,
The replacement blade has a support part that abuts the opening-side end parts of the pair of wall parts of the blade body,
The groove portion includes inner walls of the pair of wall portions, and a groove bottom wall that connects between the inner wall surfaces,
The rear surface of the replacement blade is arranged without contacting any part of the groove bottom wall,
Between the back of the replaceable blade and the groove bottom wall of the groove, a back space is formed over the entire length of the replaceable blade,
And the said groove part exists in the blade characterized by the width | variety of the part in which the said back space is formed in the state which is not mounting | wearing with the said replacement blade being larger than the thickness of the said replacement blade except the said support part ( Claim 1).

In the above-mentioned blade, the blade body is formed as an integral part.
Further, the pair of wall portions in the blade main body are urged in a direction in which the opening side end portions approach each other, and the replacement blade is sandwiched by the pair of wall portions.
Therefore, even if a spring member or the like is not disposed between the blade body and the replacement blade, the replacement blade can be stably attached to the blade body.
As a result, the number of parts is reduced, the assembly process can be reduced, and the cost can be reduced.

Further, the back surface of the replaceable blade does not contact any part of the groove bottom wall, and forms the back space therebetween .
And in the state which is not mounting | wearing with the said replacement blade, the width | variety of the part in which the said back space is formed is larger than the thickness of the said replacement blade except the said support part.
Therefore, the operation | work which mounts a replaceable blade in a groove part becomes easy. That is, the depth of the groove is deep as the back space exists. Thereby, even if a replaceable blade and a blade main body are not in a parallel state, it is possible to easily insert the replaceable blade obliquely into the opening on the distal end side in the groove portion. That is, from the initial stage of mounting the replacement blade, the opening side end portions of the pair of wall portions in the blade main body can be brought into contact with the support portion of the replacement blade. Therefore, the replacement blade can be smoothly inserted into the blade body.

Further, when the replacement blade is not attached, the width of the portion where the back space is formed is larger than the thickness of the replacement blade excluding the support portion, so that the portion where the back space is formed is replaced. The portion near the back of the blade can be easily inserted.
Once a part of the replaceable blade is inserted into the groove of the blade body, the slide blade can be easily inserted by sliding it while bringing the opening end of the blade body into contact with the support. The blade can be attached to the blade body.
Thus, with the above-described configuration, the blade of the present invention can improve the mountability of the replacement blade.

Moreover, since the said blade has the said back part space arrange | positioned without the back surface of the said replacement blade contacting anywhere on the said groove bottom wall, it can make a groove part deeply and can make a wall part high. be able to.
Thereby, the stroke of the opening side end when the wall is elastically deformed can be increased. As a result, even if there is some variation in the thickness of the replaceable blade attached to the groove, the replaceable blade can be clamped with a sufficient clamping force by the opening side end portions of the pair of wall portions.
In addition, by keeping the distance between the opening side end portions of the pair of wall portions when the replacement blade is not mounted sufficiently small, the replacement blade can be sufficiently clamped even if some aging occurs. It becomes possible.

  As described above, according to the present invention, it is possible to provide a low-cost blade with excellent replacement blade mounting ability and a small number of parts.

Sectional drawing by the plane orthogonal to the thickness direction of a cutter in an Example. The side view of the cutter in an Example. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. Sectional drawing of the blade main body of the state which is not mounting | wearing with the replacement blade in an Example. Sectional drawing of the blade main body just after cutting in an Example. In an Example, (A) The side view of a blade body, (B) The side view of a spare blade. Explanatory drawing of the mounting method of the replacement blade to a blade body in an Example. The bottom view of the razor in a prior art example. The side view of the leaf | plate spring in a prior art example. The bottom view of the razor which shows the state in the middle of inserting the blade body in a blade body in a prior art example.

In the present invention, the blade may be a blade used for, for example, a razor for face shaving or hair cutting, a medical knife, or a pathological knife.
In the present specification, the side opposite to the distal end side in the longitudinal direction of the blade will be described as the proximal end side.

Moreover, it is preferable that the said support part is a convex part protruded in the thickness direction of the said replaceable blade (Claim 2).
In this case, the end of the wall portion on the opening side can be reliably brought into contact with the support portion.

Further, the replacement blade is provided with a sandwiched portion that is sandwiched by the opening-side end portions of the pair of wall portions at a portion adjacent to the support portion on the side opposite to the blade edge, and from the back side, It is preferable that the thickness is reduced toward the holding portion (claim 3).
In this case, the opening-side end portion is positioned at the sandwiched portion, and the mounting state of the replacement blade with respect to the blade body is stabilized.

Moreover, it is preferable that the said cutter is a razor (Claim 4).
In this case, the present invention is particularly applicable to a razor in that the blade can be replaced quickly and easily during shaving or hair styling, and the blade can be held in the blade body without looseness. The effect can be further exerted.

A blade according to an embodiment of the present invention will be described with reference to FIGS.
The blade 1 of this example is a razor for shaving or cutting hair.
As shown in FIGS. 1 to 3, the blade 1 of this example is configured by detachably attaching a replacement blade 3 to a blade body 2.
The blade body 2 is formed with a groove portion 21 that opens at one end in the height direction orthogonal to the longitudinal direction and the thickness direction and opens at the distal end in the longitudinal direction.
The replacement blade 3 is disposed in the groove portion 21 so that the blade edge 32 is exposed.

The pair of wall portions 22 constituting the side wall of the groove portion 21 is biased in the direction in which the opening side end portions 221 approach each other, and the replacement blade 3 is sandwiched by the pair of wall portions 22 as shown in FIG. Yes.
As shown in FIGS. 1 and 3, the groove has inner walls 225 and 225 of the pair of walls 22 and 22 and a groove bottom wall 215 that connects between the inner walls 225. The rear surface of the replaceable blade 3 is disposed without contacting any part of the groove bottom wall 215. A back space 11 is formed across the entire length of the replaceable blade 3 between the back surface 31 of the replaceable blade 3 and the groove bottom wall 215 of the groove portion 21.
The replaceable blade 3 has a support portion 33 that abuts the opening-side end portions 221 of the pair of wall portions 22 of the blade body 2.

In the state where the replaceable blade 3 is not mounted as shown in FIG. 4, the groove portion 21 has a width W1 of a portion where the back space 11 is formed larger than a thickness W2 (FIG. 3) of the replaceable blade 3 excluding the support portion 33. .
The height H1 of the back space 11 (between the back surface 31 of the replacement blade and the deepest bottom surface 210 of the groove bottom wall 215) is preferably 15% or more of the depth H2 of the groove portion 21, for example.

Further, as shown in FIG. 3, the support portion 33 is a convex portion protruding in the thickness direction of the replaceable blade 3.
The replaceable blade 3 is provided with a sandwiched portion 34 that is sandwiched by the opening-side end portions 221 of the pair of wall portions 22 at a portion adjacent to the support portion 33 on the side opposite to the blade edge 32. And it forms so that thickness may become small toward the to-be-clamped part 34 from the back surface 31 side.

As shown in FIGS. 6B and 3, the replaceable blade 3 includes a replaceable blade main body 320 and a guide cover 310 that covers the replaceable blade main body 320 from both sides and the back surface. The guide cover 310 has a corrugated contour portion 312 at the lower end, and the cutting edge 32 of the replaceable blade body 320 is exposed from a part of the corrugated contour portion 312.
The support portion 33 is constituted by a part of the guide cover 310 and is formed linearly along the entire length of the replaceable blade 3.

Moreover, the groove part 21 is formed by cutting. That is, the groove portion 21 is formed by cutting the blade body 2 using a metal saw, a milling cutter, or the like.
As shown in FIG. 6A, the groove 21 has a tip opening 211 opened at the blade tip 231 of the blade body 2 and a lower opening opened at one end in the height direction of the blade body 2 (blade lower end 232). Part 212. In this example, the opening direction of the lower opening 212 is described as being downward.

Specifically, as shown in FIG. 5, the groove 21 is cut from a position corresponding to the blade lower end 232 with respect to a metal bar having a substantially rectangular cross section. At this stage, the pair of wall portions 22 constituting the side wall of the groove portion 21 are parallel to each other.
Next, as shown in FIG. 4, the pair of wall portions 22 are bent in a direction in which the opening side end portions 221 approach each other. At this time, the base portion of the wall portion 22 is bent. As a result, the width of the lower opening 212 in the groove 21 is narrowed. The width of the lower opening 212 when the replaceable blade 3 is not attached is smaller than the thickness of the sandwiched portion 34 of the replaceable blade 3.

The pair of wall portions 22 can be elastically deformed, and when the replacement blade 3 is attached to the groove portion 22, the pair of wall portions 22 are elastically deformed in a direction away from each other. That is, in the state where the replaceable blade 3 is mounted, the pair of wall portions 22 are urged in a direction in which the opening side end portions 221 approach each other, that is, a direction in which the replaceable blade 3 is sandwiched.
The blade body 2 is an integral part and is not formed by assembling a plurality of members.

As shown in FIGS. 1 and 2, a handle 4 is attached to the blade body 2 on the base end side. The handle 4 is made of, for example, a resin molded body.
When the replacement blade 3 is attached to or detached from the blade body 2, the replacement blade 3 is slid in the longitudinal direction relative to the blade body 2. Then, insert the blade 3 from the distal end opening portion 211 (FIG. 6) in the groove 2 1, or to disengage.

  For example, as shown in FIG. 7, the replaceable blade 3 may be stored in a state where it is raised in the case 5. In this case, the replacement blade 3 in the stored case 5 can be directly attached to the blade body 2. As described above, when the replaceable blade 3 is attached or detached, in principle, the longitudinal direction of the replaceable blade 3 and the longitudinal direction of the blade body 2 must be matched. However, it is often difficult from the beginning to match the longitudinal direction of the blade body 2 with the longitudinal direction of the replaceable blade 3. In addition, it is difficult to insert the replacement blade 3 from the tip opening portion 211 into the groove portion 21 in which the width of the lower opening portion 212 is narrower than the thickness of the replacement blade 3.

  Therefore, as shown in FIG. 7A, the blade tip 231 of the blade body 2 is brought into contact with the replaceable blade 3 obliquely from above, and a part of the replaceable blade 3 is inserted into the groove portion 21. As a result, the angle between the blade body 2 and the replaceable blade 3 is reduced in a state where the left and right are positioned, and the directions of both are made coincident as shown in FIG. Then, the blade body 2 and the replaceable blade 3 are slid relative to each other in the longitudinal direction, and the replaceable blade 3 is mounted at a predetermined position on the blade body 2.

Next, the function and effect of this example will be described.
In the blade 1, the blade body 2 is formed as an integral part. Further, the pair of wall portions 22 in the blade body 2 are urged in a direction in which the opening-side end portions 221 approach each other, and the replacement blade 3 is sandwiched between the pair of wall portions 22.
Therefore, the replacement blade 3 can be stably attached to the blade body 2 without arranging a spring member or the like between the blade body 2 and the replacement blade 3. As a result, the number of parts is reduced, the assembly process can be reduced, and the cost can be reduced.

Further, as shown in FIG. 3, the back surface 31 of the blade is not in contact with any part of the groove bottom wall 215, and has a back space 11 therebetween.
And in the state which is not mounting | wearing with the replaceable blade 3, the width W1 (FIG. 4) of the part in which the back part space 11 is formed is larger than the maximum thickness W2 (FIG. 3) of the replaceable blade 3 except the support part 33. Therefore, the operation | work which mounts the replaceable blade 3 in the groove part 21 becomes easy.
That is, the depth of the groove portion 21 is deep as much as the back space 11 exists. Thereby, even if the replaceable blade 3 and the blade body 2 are not in a parallel state, the replaceable blade 3 can be easily inserted obliquely into the tip opening portion 211 in the groove portion 21 (FIG. 7A). That is, from the initial stage of mounting the replacement blade 3, the opening-side end portions 221 of the pair of wall portions 22 in the blade body 2 can be brought into contact with the support portion 33 of the replacement blade 3. Therefore, the replacement blade 3 can be smoothly inserted into the blade body 2.

In addition, in the state where the replacement blade 3 is not attached, the width W1 of the portion where the back space 11 is formed is larger than the thickness W2 of the replacement blade 3, so that the portion where the back space 11 is formed is replaced with a replacement blade. 3 can be easily inserted in the vicinity of the back surface 31.
Once a part of the replaceable blade 3 is inserted into the groove portion 21 of the blade body 2, the slide blade is inserted while the opening side end 221 of the blade body 2 is brought into contact with the support portion 33. Thus, the replaceable blade 3 can be easily attached to the blade body 2 (FIG. 7).
Thus, with the above-described configuration, the blade 1 of this example can enhance the mountability of the replaceable blade 3.

The blade 1 has a back space 11 in which the back surface 31 of the replacement blade is not in contact with any part of the groove bottom wall 215 . Therefore , the groove part 21 can be deepened by that much, and the wall part 22 can be made high.
Thereby, the stroke of the opening side edge part 221 when the wall part 22 elastically deforms can be enlarged. As a result, even if there is some variation in the thickness of the replaceable blade 3 attached to the groove portion 21, the replaceable blade 3 can be clamped with a sufficient clamping force by the opening side end portions 221 of the pair of wall portions 22. In addition, when the replacement blade 3 is not attached, the interval between the opening-side end portions 221 of the pair of wall portions 22 (the width of the lower opening portion 212) is sufficiently small, so that some secular change occurs. Also, the replacement blade 3 can be sufficiently clamped.

Moreover, since the support part 33 is a convex part which protruded in the thickness direction of the replaceable blade 3, it becomes easy to make the opening side edge part 221 of the wall part 22 contact | abut to the support part 33 reliably.
Further, as shown in FIG. 3, the replaceable blade 3 is formed so that the thickness decreases from the back surface 31 side toward the sandwiched portion 34. Therefore, the opening side end 221 is positioned on the sandwiched portion 34, and the mounting state of the replaceable blade 3 with respect to the blade body 2 is stabilized.

Moreover, the groove part 21 forms the raw material of the blade body 2 of an integral product by cutting . Therefore , the groove part 21 can be formed easily. Further, for example, the width of the groove 21 can be easily formed more accurately than when the groove 21 is formed by bending a plate-like body.

  As described above, according to this example, it is possible to provide a low-cost blade with excellent replacement blade mounting ability and a small number of parts.

DESCRIPTION OF SYMBOLS 1 Cutlery 11 Back space 2 Blade body 21 Groove part 22 Wall part 221 Opening side edge part 3 Replacement blade 31 Back surface 32 Cutting edge 33 Bearing part

Claims (4)

A blade formed by detachably attaching a replacement blade to the blade body,
The blade body is an integral part, and has a groove that opens at one end in the height direction perpendicular to the longitudinal direction and the thickness direction and also opens at the distal end in the longitudinal direction,
The replacement blade is disposed in the groove so as to expose the blade edge,
The pair of wall portions constituting the side walls of the groove portion are biased in the direction in which the opening side end portions in the height direction approach each other, and the replacement blade is sandwiched by the pair of wall portions,
The replacement blade has a support part that abuts the opening-side end parts of the pair of wall parts of the blade body,
The groove portion includes inner walls of the pair of wall portions, and a groove bottom wall that connects between the inner wall surfaces,
The rear surface of the replacement blade is arranged without contacting any part of the groove bottom wall,
Between the back of the replaceable blade and the groove bottom wall of the groove, a back space is formed over the entire length of the replaceable blade,
And the said groove part is a blade characterized by the width | variety of the part in which the said back space is formed in the state which is not mounting | wearing with the said replacement blade, being larger than the thickness of the said replacement blade except the said support part.   The cutter according to claim 1, wherein the support portion is a convex portion protruding in a thickness direction of the replacement blade.   3. The cutter according to claim 2, wherein the replacement blade is provided with a sandwiched portion that is sandwiched by the opening-side end portions of the pair of wall portions at a portion adjacent to the support portion on the side opposite to the blade edge. A blade having a thickness that decreases from the back side toward the sandwiched portion.   The blade according to any one of claims 1 to 3, wherein the blade is a razor.

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