JPH0624675U - Grasping scissors - Google Patents

Abstract

(57) [Abstract] [Purpose] The grip portion of the spring body and the blade body can be joined with high positioning accuracy, and the assembly process can be automated without requiring the final blade alignment step. A positioning recess 7a corresponding to the planar shape of the joint 9a of each blade body 3 is provided on the side surface of the tip of each grip 5, and the joint is fitted into the positioning recess and screwed by a joint screw 13. The blade body is joined to the spring member by tightening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gripping scissors generally used as a thread cutting scissors.

[0002]

[Prior art]

 Conventionally, the gripping scissors (also known as thread-cutting scissors) used for sewing work such as Japanese-style dressing are slidably attached to each other at the tips of the spring-like, substantially U-shaped gripping part. It is configured by integrally forming a blade portion including an inner blade portion that is partially overlapped. Usually, the gripping scissors are formed by forging a steel material to integrally form a rough shape, and then the inner blade is formed by polishing the blade body.

The gripping scissors are configured such that the inner blade portions of the pair of blade bodies are partially slid and superposed when the substantially U-shaped grip portion is in a natural state. From this state, while gripping the U-shaped gripping portion from the outside, the inner blades of both blade body parts are slid relative to each other against the spring property of the U-shaped gripping portion. By doing so, it is configured so that the cutting work can be performed by the two blades. On the other hand, when the gripping force on the U-shaped grip portion is released, both blades are restored to their original natural state by the elastic force of the U-shaped grip portion.

By the way, in order to improve and maintain the sharpness as scissors, it is necessary to increase the hardness of the blade portion, and usually, the blade portion is subjected to quenching before the blade is attached. However, as described above, since the conventional gripping scissors are integrally formed of steel, if the temperature of quenching is not adequately controlled, the quenching process will reach the gripping portion. For this reason, the tenacity and fatigue strength of the grip portion decrease, and not only proper spring characteristics cannot be obtained, but also the U-shaped base end portion may be damaged by fatigue after long-term use.

Further, in the above-mentioned conventional gripping scissors, the inner blade portions of the pair of blade bodies are relatively oscillated in a sliding manner to cut an object by shearing. For this reason, like normal scissors, when the usage period extends for a long period of time, the blade portion is worn and the sharpness becomes poor. Although polishing is performed to restore the sharpness of the blade part, in the conventional gripping scissors, as described above, the U-shaped grip part and the blade part are integrally formed of steel, and Since the U-shaped grip has springiness, it was very difficult to polish the blade.

In order to solve the above problems, for example, as in the device disclosed in Japanese Utility Model Laid-Open No. Sho 63-189172, the grip portion and the blade portion are separately formed, and the grip portion has a tip end. A gripping scissors configured by joining blade portions has been proposed.

[0007]

[Problems to be solved by the device]

 In the gripping scissors described in the above publication, a joint hole in the axial direction is provided at the tip of each grip portion, and the joint portion of the blade body is fitted into this joint hole, and the blade body and the above The blade body and the grip portion are joined by fitting a fixing pin into a pin hole formed in communication with the grip portion.

However, in the conventional gripping scissors configured by joining the blade portion to the grip portion, the joining accuracy of the blade portions is low, and proper sliding of the blade portions can be obtained. However, there is a problem in that sufficient sharpness cannot be obtained simply by joining the blade portion to the grip portion.

That is, since the joint hole is formed in the shape of a deep hole in the axial direction so that the joint portion of the blade body can be fitted therein, the molding precision of the joint hole is extremely poor, and the joint hole of the blade body is inserted into the joint hole. The accuracy of positioning the above-mentioned blade bodies opposed to each other becomes low only by inserting the joint portion. For this reason, it is not possible to obtain a high precision of sliding the blade body, and it is impossible to obtain a good sharpness as it is.

Conventionally, in order to solve the above problems, it has been necessary to perform a blade edge aligning process for aligning the blade edges after joining the blade body to the grip portion. Therefore, there is a problem that the manufacturing process cannot be reduced and the manufacturing cost cannot be reduced. Moreover, since the final blade alignment step is required after the blade body is joined to the grip, not only the number of steps is increased, but also it is difficult to automate the assembly work. .

Furthermore, even when re-polishing is performed, it is not possible to obtain high assembly accuracy between the blade body and the grip portion, and therefore the above blade alignment step is required. The present invention has been devised under the above circumstances, solves the above-mentioned conventional problems, and enables the grip portion of the spring body and the blade body to be joined with high positioning accuracy, and the final blade alignment. It is an object of the present invention to provide gripping scissors capable of automating the assembly without requiring a process and reducing the production cost.

[0012]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention takes the following technical means. That is, the invention of the present application has a substantially U-shaped base end portion and a grip portion extending from the base end portion so as to face each other, a spring member integrally formed of resin, and an inner blade portion slidably contacting each other. A gripping scissors having a pair of metal plate blade bodies joined to the tip of the grip, wherein the shape of the joint of the blades is flat on the side of the tip of each grip. It is characterized in that the blade body is joined to the spring member by providing a positioning recess corresponding to the above, and by fitting the above-mentioned joining part into this positioning recess and screwing it with a joining screw.

[0013]

[Function and effect of device]

 A gripping scissors according to the present invention has a pair of gripping portions extending from a U-shaped upper end portion so as to face each other, and a metal plate blade is provided at a tip end portion of the gripping portion of a spring member formed of fiber reinforced resin. It is generally constructed by screwing the body. Therefore, unlike the conventional gripping scissors, the spring characteristic of the grip portion is not deteriorated by the quenching treatment of the blade portion, and the fatigue breakdown is not caused at the U-shaped base end portion. Further, since the grip portion is made of resin, the weight of the gripping scissors can be significantly reduced as compared with the conventional one.

Further, the blade body can be sufficiently quenched, and the quenching process can be uniformly performed. Therefore, the hardness of the blade body can be increased to improve the durability of the cutting edge, and the quality can be improved. Further, in the present invention, a positioning recess is formed on the side surface of the tip end portion of each of the grips, and the positioning recess is screwed so as to fit the joint of the blade body.

The positioning recess is formed in a shape corresponding to the planar shape of the joint of the blade bodies, and can be formed with high accuracy when the spring member is molded. Therefore, the blade body can be positioned with respect to the spring body only by fitting the joint portion of the blade body into the positioning recess. Therefore, it is possible to join the blade body and the spring body with high accuracy, and it has never been said that the relative position of the pair of blade bodies is displaced and the sharpness is lowered unlike the conventional art.

Moreover, after joining the blade body to the grip portion, a blade edge aligning step for aligning the blade edges is not required. Therefore, the manufacturing process can be reduced and the manufacturing cost can be reduced. In addition, the blade body can be removed from the spring body for easy re-polishing, and the re-assembly can be performed with high precision, and the sharpness of the blade body can be easily restored. it can. Moreover, the assembly work can be completed by simply fitting the joint part of the blade body into the positioning recess and screwing the parts together, so that the assembly can be automated.

[0017]

[Explanation of Examples]

 Hereinafter, embodiments according to the present invention will be specifically described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the gripping scissors 1 according to the present embodiment is generally configured by joining a substantially U-shaped resin spring member 2 with metal plate-shaped blade bodies 3, 3. ing. The spring member 2 is provided with a U-shaped base end portion 4 and a pair of grip portions 5 and 5 extending from the base end portion 4 so as to face each other substantially in parallel, and in this embodiment, by mixing glass fibers. It is integrally molded with reinforced fiber-reinforced polyamide resin.

Stopper portions 6 and 6 are formed integrally with the inner surfaces of the tip end portions of the grip portions 5 and 5 so as to bulge in opposition to each other. As shown in FIG. 1, the stopper portions 6 and 6 in the present embodiment are formed so as to bulge in a taper shape from the inner side surfaces of the middle portions of the grip portions 5 and 5 toward the distal end portions, and the side surfaces are Positioning recesses 7a and 7b for joining the blade bodies 3 and 3 and a pair of screw insertion holes 8a and 8b are formed, respectively.

The blade bodies 3 and 3 are provided with joint portions 9a and 9b joined to the distal end portions of the grip portions 5 and 5, and cutting edge portions 10 and 10 facing each other in a substantially V shape. . The cutting edge portion includes inner blade portions 11 and 11 that are brought into sliding contact with each other, and has the same form as the blade body portion of a conventional gripping scissors. On the other hand, the joint portions 9a and 9b are provided with two screw holes 12a and 12b corresponding to the screw insertion holes 8a and 8b provided in the stopper portions 6 and 6, respectively, which will be described later. The mounting screws 13 and 13 are joined and fixed to the grip portions 5 and 5, respectively.

In the present embodiment, as shown in FIGS. 1 and 2, the positioning recesses 7a and 7b formed on the side surfaces 6a and 6b located on the opposite sides of the pair of stopper portions 6 and 6 have The joint parts 9a, 9b of the blade body are fitted, and the joint screws 13, 13 inserted into the screw insertion holes 8a, 8b from the stopper side are inserted into the joint parts 9a, 9b of the blade body 3,3. Screwed into the screw holes 12a and 12b formed in the above, so that the stopper portions 6 and 6 are sandwiched between the head portions 13a of the joint screws 13 and 13 and the joint portions 9a and 9b of the blade bodies 3 and 3, respectively. The blade bodies 3 and 3 are joined to the spring body 2. Further, in the embodiment, the pair of blade bodies are formed in the same shape so that they can be joined to any of the grip portions.

In the gripping scissors 1 having the above structure, a pair of blade bodies 3 and 3 is screwed to a spring body 2 formed of fiber reinforced resin, and the spring body 2 and the blade body 3 are joined together. , 3, and can be formed separately. Therefore, unlike the conventional gripping scissors, the spring characteristics of the grip portion are not deteriorated by the quenching treatment of the blade body, and the U-shaped base end is not fatigued or broken. The glass fiber reinforced polyamide resin used for the spring member 2 has a significantly higher fatigue strength of the spring than that of the grip portion made of the conventional steel material and can significantly improve the life. . In addition, the specific gravity is smaller than that of steel, and the gripping scissors can be made lighter.

Further, the stopper portions 6 and 6 formed inside the tips of the grip portions 5 and 5 are formed so that the top portions 14 and 14 are opposed to each other with a predetermined clearance provided therebetween. , 5 are elastically pinched by fingers, the tops are brought into contact with each other. The clearance is set so that the grip portions 5, 5 can be relatively swung within a range in which the cutting edge portions 10, 10 of the blade bodies 3, 3 can effectively perform the cutting work. Therefore, the provision of the stopper portions 6 and 6 prevents the cutting edge portion 10 of one blade body 3 from protruding from the back portion of the other blade body that faces the other, so that the grip portions 5 and 5 are gripped. There is no danger of injuring your fingers, and you can safely perform cutting work.

Moreover, in the gripping scissors 1 according to the present embodiment, the planar shape of the joint portions 9a and 9b of the blade bodies 5 and 5 is formed on the side surfaces of the tip end portions of the gripping portions 5 and 5 respectively. By providing the positioning recesses 7a and 7b, and fitting the joints 9a and 9b into the positioning recesses 7a and 7b and screwing them with the joint screws 13 and 13, the blade bodies 3 and 3 are fixed to the springs. It is joined to the member 2. The positioning recesses 7a, 7b are formed in a shape corresponding to the flat shape of the joint portions 9a, 9b of the blade bodies 3, 3 and have a depth corresponding to the thickness of the blade bodies 3, 3. Is formed in.

The positioning recesses 7a and 7b can be formed with high precision at the same time when the spring member 2 is molded. Therefore, the blade bodies 3, 3 can be positioned with respect to the spring body 2 simply by fitting the joint portions 9a, 9b of the blade bodies 3, 3 into the positioning recesses 7a, 7b. Therefore, it becomes possible to join the blade bodies 3 and 3 and the spring body 3 with high accuracy, and the relative position of the pair of blade bodies is displaced and the sharpness is lowered unlike the conventional case. Absent.

Since the assembling accuracy of the blade bodies 3 and 3 and the spring member 2 can be improved, the blade tips are aligned after the blade bodies 3 and 3 are joined to the grip portions 5 and 5. The step of aligning the blade edges is unnecessary. Therefore, the manufacturing process can be reduced and the production cost can be reduced. Furthermore, the blade bodies 3 and 3 can be easily removed from the spring body 2 for re-polishing, and reassembly can be performed with high precision, and sharpness can be easily restored.

Moreover, the assembly work is completed simply by fitting the joints 7a, 7b of the blade bodies 3, 3 into the positioning recesses 7a, 7b and screwing them together with the joint screws 13, 13. It is also possible to achieve Further, in this embodiment, as shown in FIG. 1, the screw insertion holes 8a, 8b and the screw holes 12a, 12b are formed so as to be offset from the axis of symmetry of the joint portions 9a, 9b. For this reason, the above-mentioned joint portions 9a and 9b cannot be fitted into the positioning concave portions 7a and 7b with the blade bodies 3 and 3 with the inner blade portions 11 and 11 facing outward. Therefore, there is no fear that the blade bodies 3 and 3 are mistakenly installed in the opposite direction.

Further, since the positioning recesses 7a, 7b are set to have a depth corresponding to the thickness of the blade bodies 3, 3, the blade bodies 3, 3 are joined to the grip portions 5, 5. However, no step is formed between the blade bodies 3 and 3 and the side surfaces of the grips 5 and 5. For this reason, the side surfaces of the grip portions 5, 5 are smooth, the usability is not deteriorated, and the gripping scissors excellent in design can be provided. Furthermore, in the gripping scissors 1 according to this embodiment, the positioning recesses 7a and 7b are formed on the side surfaces 6a and 6b located on the opposite sides of the pair of stopper portions 6 and 6, and The inner blade portion forming surfaces 11a and 11b of the pair of blade bodies 3 and 3 are attached to the bottom surfaces of the positioning recesses 7a and 7b, respectively, and the blade bodies 3 and 3 are screwed to the spring member 2 respectively. There is.

That is, the blade bodies 2 and 2 are fitted from both sides of the spring member 2 into the positioning recesses 7a and 7b from the sides of the grips 5 and 5, and the joint screws 13 and 13 are gripped. Assembling work can be performed by simply screwing from the side of 5, 5. Therefore, the blade bodies 3 and 3 can be assembled only from the side of the spring member, and the structure of the automatic assembly machine is not complicated.

As described above, in the gripping scissors 1 according to the present invention, it becomes possible to join the blade bodies 3 and 3 and the rod body 2 with high accuracy, and the assembling work can be remarkably facilitated. In addition to the above, the final blade alignment step can be omitted. Therefore, the manufacturing cost can be reduced and the production efficiency can be significantly improved.

The scope of the present invention is not limited to the above embodiments. Although glass fiber reinforced polyamide resin is used as the material for forming the spring member in the examples, other resin spring materials such as carbon fiber reinforced resin may be used. Further, in the embodiment, the positioning recesses are formed on the side surfaces of the pair of stopper portions located on the opposite sides, and the inner blade forming surfaces of the pair of blade bodies are attached to the side surfaces. Although the blade body is screwed to the spring member, the positioning recess may be formed without providing the stopper portion. Further, the positioning recess may be screwed so that the side opposite to the inner blade forming surface is attached. Further, in the embodiment, the pair of blade bodies have the same shape so that they can be joined to any of the grip portions of the spring member, but blades having different cutting edge shapes or different contact portion shapes are used. The body can also be joined to the grip.

[Brief description of drawings]

FIG. 1 is a front view of a gripping scissors according to the present invention.

FIG. 2 is a plan view of the gripping scissors according to the present invention.

FIG. 3 is a side view of the gripping scissors according to the present invention.

FIG. 4 is a sectional view taken along the line AA in FIG.

5 is an enlarged cross-sectional view taken along the line BB in FIG.

[Explanation of symbols]

 2 Spring Member 3 Blade Body 4 Base End 5 Grip 7a, 7b Positioning Recess 9a, 9b Joint 11 Inner Blade 13 Joint Screw

Claims (1)

[Scope of utility model registration request] 1. A substantially U-shaped base end portion and a grip portion extending from the base end portion so as to face each other, a spring member integrally formed of resin, and an inner blade portion slidably contacting each other. ,
In a gripping scissors including a pair of metal plate-shaped blade bodies joined to the tip end portion of the grip portion, a positioning corresponding to the planar shape of the joint portion of each blade body is provided on the side surface of the tip end portion of each grip portion. A gripping scissors characterized in that the blade body is joined to the spring member by providing a recess and fitting the joint to the positioning recess and screwing the joint with a joint screw.