Manufacturing method of scissors and combination of at least two types of scissors

Abstract

To provide an improved method for manufacturing scissors and scissors that are easier to manufacture. [Solution] In the method for manufacturing scissors 12, 14, 16, each pair of scissors has a first blade 18 and a second blade 20 rotatably connected to each other by a fastening element 22, and each blade has a front end 24 and a rear end 26 opposite the front end, a front portion 28 extending toward the front end 24 and constituting a cutting element, and a rear portion 30 extending toward the rear end 26 and configured to support a handle 36, and the front portion 28 of the first blade 18 of at least one pair of first scissors 12 and the front portion 28 of the first blade 18 of at least one pair of second scissors 14 are designed differently, and the rear portion 30 of the first blade 18 of the first scissors and the rear portion 30 of the first blade 18 of the second scissors are designed identically.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing scissors, each having a first blade and a second blade rotatably connected by a fastening element, and to a combination of at least two types of said scissors. [Background technology]

[0002] The two blades of the scissors are often connected to each other by a fastening element, which may consist of a screw or a rivet. (also called the "first end") And the rear end, which is opposite to this front end (also called the "second end") The front of each blade (also referred to as the "first part") extends toward the front end and defines a cutting element. (also referred to as the "second part") extends towards the rear end and is configured to support a handle that can be injection molded or installed in the rear as an injection molded part, for example. This rear part is usually provided with a contact point where the two blades rub against each other as they rotate around the fastening element. The rear part to which the plastic handle is attached is called the nakago.

[0003] The design of the contact points affects the cutting performance and ease of movement. The design and location of the tangs affect the relative position of each handle and therefore the ergonomics of the scissors. In the conventional approach, different designs of the back end are common depending on the size and use of the scissors, especially since in most cases the blades are manufactured and ground separately. Different designs of the contact points result in different cutting performance of the scissors. Thus, different designs of tangs affect the attachment of the handles. As a result, the work holders will be different in the subsequent manufacturing process (e.g. injection molding tool) and in the grinding process, which requires manual reworking during the manufacturing of the scissors. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT It is an object of the present invention to provide an improved method for manufacturing scissors and scissors that are easier to manufacture. [Means for solving the problem]

[0005] The method according to the invention is defined by the features of claim 1. A combination of at least two types of scissors according to the invention is defined in the independent claims 6 and 7, respectively.

[0006] According to the present invention, the front part of the first blade of at least one first pair of scissors and the front part of the first blade of at least one second pair of scissors are differently designed, and the rear part of the first blade of the first pair of scissors and the rear part of the first blade of the second pair of scissors are identically formed. This allows the rear part of each first blade of the first and second pairs of scissors to have the same shape, even though the scissors have differently designed front parts or cutting elements. Here, the rear parts of the first and second blades of the scissors, especially the tangs, may be designed differently as long as the contact points rub against each other. This allows for asymmetric handle shapes. Thus, scissors with differently designed cutting elements for different applications can be provided with the same handle at their rear parts and / or can be made to have the same cutting performance reproducibly due to the contact points designed similarly.

[0007] Also, preferably, the front part of the second blade of the first pair of scissors and the front part of the second blade of the second pair of scissors are of different designs, and the rear part of the second blade of the first pair of scissors and the rear part of the second blade of the second pair of scissors are formed identically. In this case, the rear parts of the second blades of the first and second pairs of scissors are also formed identically, while the front parts of the second blades of the first and second pairs of scissors are of different designs. Advantageously, in particular, the tangs of the first blades of these scissors and the tangs of the second blades of these scissors are formed identically.

[0008] The front portion may extend from the fastening element to the front end, and correspondingly, the rear portion may extend from the fastening element to the rear end.

[0009] In the present invention, the front part of each blade is the part of the blade that extends to its front end. This part may be, for example, the entire blade part from the fastening element to the front end of the blade, or only a part of it. Similarly, the rear part refers to the part of the blade that extends to its rear end. This rear part may be the entire blade part from the fastening element to the rear end, or only a part of it. It is therefore important that the rear part of the first blade of the first scissors designed to attach a handle and the corresponding part of the second blade of the first scissors, and, if applicable, also of other scissors, are of the same design, thereby facilitating the manufacture of multiple scissors, when the scissors have different blades or cutting elements, by allowing the handles to be attached to the same parts of the respective blades using the same tool.

[0010] The first blade may be the upper blade or the lower blade of each pair of scissors. It is important that the second blade is the other blade of each pair of scissors. Thus, if the first blade is the upper blade, the second blade is the lower blade. Similarly, if the first blade is the lower blade of each pair of scissors, the second blade is the upper blade.

[0011] The rear part may be provided with a tang designed to fasten a handle to the rear part, for example by injection molding or attaching a plastic handle to the rear part, or by forging, welding or sintering the handle, where the tang of the first blade of the first pair of scissors is formed identically to the tang of the first blade of the second pair of scissors. Correspondingly or alternatively, the tang of the second blade of the first pair of scissors may be formed identically to the tang of the second blade of the second pair of scissors.

[0012] The rear of each blade may be provided with a contact point, and the contact point of the first blade of each pair of scissors and the contact point of the second blade rub against each other when the two blades are in contact with each other and rotate relative to each other. Preferably, the contact point of the first blade of the first pair of scissors is of the same design as the contact point of the first blade of the second pair of scissors and / or the contact point of the second blade of the first pair of scissors is of the same design as the contact point of the second blade of the second pair of scissors.

[0013] The present invention further relates to a combination of at least two types of scissors produced by the method according to the invention.

[0014] In the following, embodiments of the invention will be explained in more detail with reference to the drawings. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 shows a first pair of scissors. [Diagram 2] FIG. 2 is a diagram showing two blades of the first pair of scissors. [Diagram 3] FIG. 13 shows a second pair of scissors. [Figure 4] FIG. 2 is a diagram showing two blades of the second pair of scissors. [Diagram 5] FIG. 13 shows a third pair of scissors. [Figure 6] FIG. 11 is a diagram showing two blades of the third pair of scissors. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Each of the three types of scissors 12, 14, 16 according to the embodiments shown in the drawings comprises two blades 18, 20 connected to each other by a fastening element (not shown), e.g., a screw, which is fastened (e.g., screwed) through two fastening holes 22 shown in the drawings, and the two blades 18, 20 are rotatable toward each other in the fastened and connected state.

[0017] Each pair of scissors has two blades 18, 20, each of which has a front end 24 and a rear end 26 opposite the front end 24. The front portion 28 of each blade extends from the front end 24 to the fastener opening 22. The rear portion 30 of each blade 18, 20 extends from the fastener opening 22 to the rear end 26. Each rear portion 30 has a contact point 32 and a tang 34. The contact points 32 of the two blades 18, 20 of each pair of scissors 12, 14, 16 are designed and positioned to rub against each other as the two blades 18, 20 rotate toward each other.

[0018] The tang 34 is a portion of each blade 18, 20 that extends between the contact point 32 and the rear end 26, has a relatively small width, and has a shape that allows a handle 36 to be attached thereto, for example by injection molding a plastic handle into the portion. For this purpose, the tang 34 of each blade 18, 20 is provided with a recess 40 that prevents the attached handle 36 from falling off. Other designs are also possible for the shape of the tang 34 of the blade 18, 20 that allows the handle 36 to be properly attached so that it does not fall off.

[0019] As can be seen from the drawings, the front portion 28 of the blades 18, 20 of each pair of scissors 12, 14, 16 has a different design. The front portion 28 of the first pair of scissors 12 has a tapered design towards the front end 24 and has a substantially straight edge design. The front portion 28 of the second pair of scissors 14 has a rounded shape in the area of ​​the front end 24. The front portion 28 of the third pair of scissors 16 has a tapered design towards the front end 24 and has a curved edge design.

[0020] In contrast, the rear portions 30 of the blades 18, 20 of the three types of scissors 12, 14, 16 are identical in design. As a result, the contact points 32 and the tangs 34 are also identical. This allows the three types of scissors 12, 14, 16 to have the same friction and friction behavior between the contact points. In addition, the rear portions 30 of the three types of scissors 12, 14, 16 can be attached with handles 36 of the same or similar design, such as by an injection molding process, using the same manufacturing method and the same manufacturing tools.

[0021] In this specification, expressions such as "same design" and "same shape" mean that the size, shape, outer dimensions, and perimeter contour lines match each other, i.e., they are the same. In contrast, in this specification, expressions such as "different design" and "different shape" mean that the size, shape, outer dimensions, and perimeter contour lines are different, i.e., they are different from each other. The present invention includes the following embodiments. [Aspect 1] A method for manufacturing scissors (12, 14, 16), comprising the steps of: Each pair of scissors includes a first blade (18) and a second blade (20) rotatably coupled to each other by a fastening element (22); Each of the blades is a front end (24) and a rear end (26) opposite the front end; a front portion (28) extending toward the front end (24) and constituting a cutting element; a rear portion (30) extending toward the rear end (26) and configured to support a handle (36); The method, wherein the front portion (28) of the first blade (18) of at least one first pair of scissors (12) and the front portion (28) of the first blade (18) of at least one second pair of scissors (14) are of different designs, and the rear portion (30) of the first blade (18) of the first pair of scissors and the rear portion (30) of the first blade (18) of the second pair of scissors are formed identically. [Aspect 2] The method according to claim 1, wherein the front portion (28) of the second blade (20) of the first pair of scissors (12) and the front portion (28) of the second blade (20) of the second pair of scissors (14) have different designs, and the rear portion (30) of the second blade (20) of the first pair of scissors (12) and the rear portion (30) of the second blade (20) of the second pair of scissors (14) are formed identically. [Aspect 3] The method according to claim 1 or 2, wherein the front portion (28) extends from the fastening element (22) to the front end (24) and / or the rear portion (30) extends from the fastening element (22) to the rear end (26). [Aspect 4] The method according to any one of the preceding claims, wherein the rear part comprises a tang (34) designed to fasten a handle (36), the tang (34) of the first blade (18) of the first pair of scissors (12) is formed identically to the tang (34) of the first blade (18) of the second pair of scissors (14); and / or The method, characterized in that the tang (34) of the second blade (20) of the first pair of scissors (12) and the tang (34) of the second blade (20) of the second pair of scissors (14) are formed identically. [Aspect 5] The method according to any one of the first to fourth aspects, wherein the rear portion (30) comprises a touch point (32); When the two blades (18, 20) rotate in contact with each other, the contact point of the first blade (18) of each pair of scissors (12, 14, 16) rubs against the contact point (32) of the second blade (20), the contact point (32) of the first blade (18) of the first pair of scissors (12) is formed identically to the contact point (32) of the first blade (18) of the second pair of scissors (14); and / or The method is characterized in that the contact point (32) of the second blade (20) of the first pair of scissors (12) and the contact point (32) of the second blade (20) of the second pair of scissors (14) are formed identically. [Aspect 6] A combination of at least two types of scissors (12, 14, 16) produced by the method according to any one of aspects 1 to 5. [Aspect 7] The combination of at least two types of scissors (12, 14, 16), Each pair of scissors includes a first blade (18) and a second blade (20) rotatably coupled to each other by a fastening element (22); Each of the blades is a front end (24) and a rear end (26) opposite the front end; a front portion (28) extending toward the front end (24) and constituting a cutting element; a rear portion (30) extending toward the rear end (26) and configured to support a handle (36); A combination in which the front portion (28) of the first blade (18) of at least one first pair of scissors (12) and the front portion (28) of the first blade (18) of at least one second pair of scissors (14) are of different designs, and the rear portion (30) of the first blade (18) of the first pair of scissors and the rear portion (30) of the first blade (18) of the second pair of scissors are formed identically. [Aspect 8] A combination according to claim 7, characterized in that the front portion (28) of the second blade (20) of the first pair of scissors (12) and the front portion (28) of the second blade (20) of the second pair of scissors (14) are of different designs, and the rear portion (30) of the second blade (20) of the first pair of scissors (12) and the rear portion (30) of the second blade (20) of the second pair of scissors (14) are formed identically. [Aspect 9] The combination of any one of aspects 6 to 8, wherein the front portion (28) extends from the fastening element (22) to the front end (24) and / or the rear portion (30) extends from the fastening element (22) to the rear end (26). [Aspect 10] The combination according to any one of aspects 6 to 9, wherein the rear part comprises a tang (34) designed to fasten a handle (36); the tang (34) of the first blade (18) of the first pair of scissors (12) is formed identically to the tang (34) of the first blade (18) of the second pair of scissors (14); and / or A combination, characterized in that the tang (34) of the second blade (20) of the first pair of scissors (12) and the tang (34) of the second blade (20) of the second pair of scissors (14) are formed identically. [Aspect 11] In the combination according to any one of aspects 6 to 10, the rear portion (30) comprises a touch point (32); When the two blades (18, 20) rotate in contact with each other, the contact point of the first blade (18) of each pair of scissors (12, 14, 16) rubs against the contact point (32) of the second blade (20), the contact point (32) of the first blade (18) of the first pair of scissors (12) is designed to be identical to the contact point (32) of the first blade (18) of the second pair of scissors (14); and / or A combination characterized in that the contact point (32) of the second blade (20) of the first pair of scissors (12) and the contact point (32) of the second blade (20) of the second pair of scissors (14) are designed to be identical.

Claims

1. A method for manufacturing scissors (12, 14, 16), comprising the steps of: Each of said scissors comprises a first blade (18) and a second blade (20) rotatably connected to each other by a fastening element (22); Each of the blades is a first end (24) and a second end (26) opposite the first end; a first portion (28) extending toward said first end (24) and constituting a cutting element; a second portion (30) extending toward the second end (26) and configured to support a handle (36); The method comprises: forming the first portion (28) of the first blade (18) of at least one first pair of scissors (12) and the first portion (28) of the first blade (18) of at least one second pair of scissors (14) into shapes different from each other, wherein the size, shape, outer dimensions, and outer edge contour of the first portion (28) of the first blade (18) of the first pair of scissors (12) are different from the first portion (28) of the first blade (18) of the second pair of scissors (14); forming the second portion (30) of the first blade (18) of the first pair of scissors and the second portion (30) of the first blade (18) of the second pair of scissors to have the same shape as each other; forming the first portion (28) of the second blade (20) of the first pair of scissors (12) and the first portion (28) of the second blade (20) of the second pair of scissors (14) into shapes different from each other, wherein the size, shape, outer dimensions, and outer edge contour of the first portion (28) of the second blade (20) of the first pair of scissors (12) are different from the first portion (28) of the second blade (20) of the second pair of scissors (14); forming the second portion (30) of the second blade (20) of the first pair of scissors (12) and the second portion (30) of the second blade (20) of the second pair of scissors (14) into the same shape as each other; forming all of the first portions (28) extending from the fastening element (22) to the first end (24) and all of the second portions (30) extending from the fastening element (22) to the second end (26); forming all of said second parts with a core (34) formed for injection molding a handle (36); forming the tang (34) of the first blade (18) of the first pair of scissors (12) into the same shape as the tang (34) of the first blade (18) of the second pair of scissors (14); and / or forming the tang (34) of the second blade (20) of the first pair of scissors (12) into the same shape as the tang (34) of the second blade (20) of the second pair of scissors (14); injection molding handles onto each of said cores (34) using the same manufacturing method and the same manufacturing tools for manufacturing the different types of scissors, such that all handles of said different types of scissors are formed with the same shape; A method comprising:

2. 2. The method of claim 1, further comprising the steps of: forming the second portion (30) with a contact point (32); forming a contact point of the first blade (18) of each pair of scissors (12, 14, 16) and a contact point (32) of the second blade (20) so as to rub against each other when the two blades (18, 20) rotate in contact with each other; forming the contact point (32) of the first blade (18) of the first pair of scissors (12) in the same shape as the contact point (32) of the first blade (18) of the second pair of scissors (14); and / or forming the contact point (32) of the second blade (20) of the first pair of scissors (12) into the same shape as the contact point (32) of the second blade (20) of the second pair of scissors (14).

3. At least two types of scissors (12, 14, 16) manufactured by the method according to claim 1 or 2, The at least two types of scissors (12, 14, 16) include a first blade (18) and a second blade (20) rotatably coupled to each other by a fastening element (22); Each of the blades is a first end (24) and a second end (26) opposite the first end; a first portion (28) extending toward said first end (24) and constituting a cutting element; a second portion (30) extending toward the second end (26) and configured to support a handle (36); the first portion (28) of the first blade (18) of at least one first pair of scissors (12) and the first portion (28) of the first blade (18) of at least one second pair of scissors (14) are formed in different shapes from each other, such that the size, shape, outer dimensions and outer edge contour of the first portion (28) of the first blade (18) of the first pair of scissors (12) are different from the first portion (28) of the first blade (18) of the second pair of scissors (14); The second portion (30) of the first blade (18) of the first pair of scissors and the second portion (30) of the first blade (18) of the second pair of scissors are formed in the same shape as each other, The first portion (28) of the second blade (20) of the first pair of scissors (12) and the first portion (28) of the second blade (20) of the second pair of scissors (14) are formed in different shapes from each other, and the size, shape, outer dimensions and outer edge contour of the first portion (28) of the second blade (20) of the first pair of scissors (12) are different from the first portion (28) of the second blade (20) of the second pair of scissors (14); The second portion (30) of the second blade (20) of the first pair of scissors (12) and the second portion (30) of the second blade (20) of the second pair of scissors (14) are formed in the same shape as each other, all of the first portions (28) extend from the fastening element (22) to the first end (24), and all of the second portions (30) extend from the fastening element (22) to the second end (26); The second portion includes a core (34) formed for injection molding a handle (36); The core (34) of the first blade (18) of the first pair of scissors (12) is formed in the same shape as the core (34) of the first blade (18) of the second pair of scissors (14); and The core (34) of the second blade (20) of the first pair of scissors (12) is formed in the same shape as the core (34) of the second blade (20) of the second pair of scissors (14); At least two types of scissors, in which the handles are injection molded onto the respective cores (34) using the same manufacturing method and the same manufacturing tools in manufacturing the different types of scissors, so that all the handles of the different types of scissors are formed into the same shape.

4. At least two types of scissors according to claim 3, wherein the second portion (30) comprises a contact point (32), When the two blades (18, 20) rotate in contact with each other, the contact point of the first blade (18) of each pair of scissors (12, 14, 16) rubs against the contact point (32) of the second blade (20); the contact point (32) of the first blade (18) of the first pair of scissors (12) is formed in the same shape as the contact point (32) of the first blade (18) of the second pair of scissors (14); and / or At least two types of scissors, in which the contact point (32) of the second blade (20) of the first pair of scissors (12) and the contact point (32) of the second blade (20) of the second pair of scissors (14) are formed in the same shape.

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