JP5908778B2 - Scissors biaxial opening and closing mechanism - Google Patents

Description

  The present invention improves the scissors opening and closing mechanism, more specifically, it can reduce the fatigue of the arm due to the opening and closing operation of the handle by utilizing the repulsive force of the elastic member, and also the repulsive force unevenness and failure hardly occur. The present invention relates to a scissors biaxial opening / closing mechanism that can be easily made compact.

  As is well known, “Scissors” is a tool that cuts objects such as paper and thread between the left and right blades, but if the objects are longer than the blades or if there are many objects, The cutting operation is performed by repeatedly opening and closing the handle while holding the handle. In addition, when the object is hard, since it is necessary to cut at the base side of the blade (utilization of the lever principle), the number of opening / closing operations naturally increases.

  However, with normal scissors, it is necessary to perform both a closing operation and an opening operation. Therefore, if the work is continued for a long time, fatigue tends to be accumulated in the arm. Moreover, in the normal scissors that require an opening operation, it is necessary to provide an annular part for putting a finger in the handle, so that when the scissors are widened and placed in a bag or the like, they are easily bulky.

  Conventionally, a scissor is also known in which a torsion spring is attached to the inside of a handle so that a closed handle automatically returns (see, for example, Patent Document 1). In this scissor, a torsion spring is attached. Since the groove needs to be formed inside the handle, the handle tends to be thick. There is also a concern that the torsion spring may come off due to a dropped impact.

  On the other hand, as a structure for attaching a spring to the inside of a handle, a structure in which a pair of leaf springs curved from the front side of the handle to the rear side (or from the rear side to the front side) is hinged on the center line is also known (patent In this structure, since the hinge portion for connecting the leaf springs and the leaf spring are adjacent to each other, a large load is applied to the hinge portion during use, and failure tends to occur.

  In addition, in the structure described in the above-mentioned document 2, since the space between the hinge part connecting the leaf springs and the hinge part serving as the fulcrum of the opening / closing operation is wide, the hinge part connecting the leaf springs greatly moves back and forth when closing the handle. The repulsive force tends to be uneven (the repulsive force is small while the hinge portion is moving, but the repulsive force suddenly increases when the hinge portion stops and the leaf spring begins to deform).

  On the other hand, as a scissor using a leaf spring type elastic member, one having an elastic member curved outward on the rear end side of the handle is known (see Patent Document 3). Incidentally, in the structure described in Document 3, when the handle is closed, the ends of the elastic members abut on the center line of the scissors, and the elastic members are deformed by pressing each other.

  However, the scissors described in the above-mentioned document 3 also have a shape in which an elastic member protrudes greatly on the outer side of the handle, similarly to the normal scissors in which an annular portion is provided on the handle, and the width of the scissors is inevitably increased. In addition, since the distal end portion of the elastic member is not connected, there is a concern that other articles may be damaged at the distal end portion when placed in a bag or the like.

Japanese Patent Laid-Open No. 10-80582 Japanese Utility Model Publication No. 5-31772 Japanese Utility Model Publication No. 29-6814

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to reduce the fatigue of the arm caused by the opening and closing operation of the handle using the repulsive force of the elastic member. In addition, it is an object of the present invention to provide a scissors two-axis opening / closing mechanism that is less likely to cause unevenness and failure of the repulsive force during opening / closing operation, is easy to be compact, and is convenient to carry.

  Means employed by the present inventor to solve the above problems are as follows.

That is, the present invention is provided with a blade portion 11 on the working point side of the pair of hook pieces 1 and 1 crossed in an X shape, a handle portion 12 on the force point side, and both the hook pieces 1 and 1 are connected to the blade portion 11. In the opening and closing mechanism of the scissors S connected by the first hinge part H ₁ between the handle part 12 and the handle part 12,
An outer rod portion 12a connected to the blade portion 11 with the handle portion 12 of the collar piece 1; an inner rod portion 12b disposed along the inner side of the outer rod portion 12a; the inner rod portion 12b and the outer portion While connecting the rod portion 12a on the opposite side of the blade portion 11 and comprising a folded portion 12c formed in a U shape or V shape using an elastic material,
The inner rod 12b-12b between the pair of scissor pieces 1-1, as well as hinged at the tip end, the second hinge unit H _2, closed cutting edge and on the center line C which connects the first hinge unit H ₁ And at a position closer to the first hinge part H ₁ than the front and rear center of the closed handle part 12,
When the handle portions 12 and 12 of the pair of collar pieces 1 and 1 are closed, the positional relationship between the outer rod portion 12a and the inner rod portion 12b rotating at different fulcrums changes, and the folded portion 12c is bent and deformed. It is characterized in that the parts 12 and 12 are biased in the opening direction.

  Further, the outer rod portion 12a, the inner rod portion 12b, and the folded portion 12c are formed from a single member by using a bent metal or plastic bar material for the handle portion 12 of the collar piece 1, thereby integrating the single piece. Molding is possible and the manufacturing cost can be reduced. Moreover, if the blade part 11 main body and the handle | pattern part 12 of the collar piece 1 are comprised by the single member of the same material, manufacturing cost can further be reduced.

Furthermore, if each handle | pattern part 12 * 12 of the said collar piece 1 * 1 is made into the shape which patterns overlap when the handle | pattern parts 12 * 12 are closed, the lateral width of the closed scissors can also be restrained small. Also at that time, the outer contour of the inner and the handle portion 12 of the blade portion 11, a second hinge portion except for the vicinity of H ₂ ho Isuzu made to be linear, further folded portion 12c and the inner rod portion 12b Further, when the handle portions 12 and 12 are overlapped, the inner rod portion 12b can be slimmed so as not to protrude from the outer side of the flange piece 1 on the other side.

Meanwhile, in order to slim the width of the handle, the handle portion 12 of the scissor pieces 1, by bending the first vicinity of the hinge portion H ₁ of the outer rod portions 12a in an arc shape, the shank 12, 12 It closed it is also possible to form the second hinge portion H ₂ of Komu fitting recess 12d when the.

  On the other hand, when the pattern portions 12 and 12 are closed, the patterns overlap with each other when the handle portions 12 and 12 are opposed to each other. By providing each 12f, it is possible to fix the handle portions 12 and 12 in a stacked state, which makes it easier to store and carry.

  In the present invention, the handle of the scissors is composed of a highly rigid outer rod portion and inner rod portion, and a leaf spring-like folded portion connecting these at the rear end side, and further, the inner rod portions of the pair of collar pieces Since the handle is closed on the center line of the scissors, when the handle is closed, the handle can be biased in the opening direction by deformation of the folded part, so the closed handle can be opened by simply loosening the handle. It can be returned to the state.

  Moreover, in the present invention, the hinge portion (second hinge portion) that connects the inner rod portions and the folded portion are separated by the length of the inner rod, so a relatively hard metal material or plastic material is used for the folded portion. Even when it is used, an excessive load is not applied to the second hinge part, and failure of the second hinge part hardly occurs.

  Further, in the present invention, the position of the second hinge portion is arranged beside the hinge portion (first hinge portion) serving as a fulcrum for the handle opening / closing operation, thereby moving the second hinge portion when closing the handle. Can be kept small. Therefore, when the handle is closed, there is no great unevenness in the repulsive force in the middle.

  In addition, by adopting the above configuration, it is not necessary to provide an annular part or elastic member that protrudes greatly from the outside of the handle, so the width of the scissors can be greatly reduced and placed in a bag or a pocket of clothes. It is easy to carry. Further, since the inner rod portions are hingedly connected, there is no fear of damaging other articles when put in the bag.

  Therefore, according to the present invention, not only is the arm hard to get tired even after cutting for a long time, but there is no uncomfortable feeling of opening and closing operation, it is excellent in durability, and it is compact and convenient for carrying and storing. Since the useful scissors that can be designed can be provided, the practical utility value of the present invention is very high.

It is a whole perspective view showing scissors provided with the biaxial opening-and-closing mechanism in Example 1 of the present invention. It is the top view and side view showing the structure of the scissors provided with the biaxial opening-and-closing mechanism in Example 1 of this invention. It is a state explanatory drawing showing the opening-and-closing state of scissors provided with the biaxial opening-and-closing mechanism in Example 1 of the present invention. It is the top view and side view showing the structure of the scissors provided with the biaxial opening-and-closing mechanism in Example 2 of this invention. It is a state explanatory drawing showing the opening-and-closing state of scissors provided with the biaxial opening-and-closing mechanism in Example 2 of the present invention.

“Example 1”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a pair of hooks having a blade 11 on the front side and a handle 12 on the rear side, and what is indicated by S is a pair of hooks 1. 1 is a pair of scissors crossed in an X shape and connected by a first hinge portion H ₁ between the blade portion 11 and the handle portion 12.

  In the first embodiment, the handle portion 12 of the collar piece 1 includes an outer rod portion 12a, an inner rod portion 12b disposed along the inner side of the outer rod portion 12a, and a U-shape that connects these at the rear end side. And a folded portion 12c curved in a shape (see FIG. 1). The outer rod portion 12a and the inner rod portion 12 are made of a material having relatively high rigidity (i.e., hardly deformed).

Further, the folded portion 12c of the handle portion 12 is formed from stainless steel that is also used as an elastic material for the leaf spring, while one end of the outer rod portion 12a of the handle portion 12 (the end portion on the opposite side to the folded portion 12c) ) to have integrally formed blade portion 11 and the handle portion 12 of the scissor pieces 1 linked base end portion of the blade portion 11 (end portion of the first hinge unit H ₁ side).

  In the present embodiment, in order to facilitate the manufacture, a bent metal rod is used for the handle 12 of the collar piece 1. Therefore, the materials of the outer rod 12a, the inner rod 12b, and the folded portion 12c are as follows. All are the same. Moreover, since the blade part 11 main body and the handle part 12 are also composed of a single member, the material of the blade part 11 and the handle part 12 is also the same.

On the other hand, the scissor pieces 1 - Each shank 12, 12 of 1 is hinged to front ends of the inner rod 12b-12b in the vicinity of the first hinge unit H _1. Incidentally, the second hinge unit H ₂ is the position on the center line C which connects to FIGS. 2 (a) and the cutting edge and the first hinge portion H ₁ closed (b), the and closed shank It is arranged at a position closer to the first hinge portion H ₁ than the front and rear center of 12.

With the above configuration, as shown in FIGS. 3A and 3B, when the handle portions 12 and 12 are closed from the opened state, different fulcrums (the first hinge portion H ₁ and the second hinge portion H ₂ ) are used. The positional relationship between the outer rod portion 12a and the inner rod portion 12b rotating at the same time changes, and the folded portion 12c bends and deforms, so that the handle portions 12 and 12 are biased in the opening direction (thick arrow direction in the figure). Can do.

In addition, since the second hinge portion H ₂ is disposed in the vicinity of the first hinge portion H ₁ , there is almost no movement of the second hinge portion H ₂ when closing the handle. Further, by releasing the folded portion 12c of the second hinge portion H ₂ and shank 12, an excessive load is applied it is not in the second hinge portion H ₂ even when using a hard material in the folded portion 12c.

  Furthermore, in this embodiment, the handle portions 12 and 12 of the collar pieces 1 and 1 are formed so that the handles overlap when the handles are closed, so that the width of the closed scissors S does not increase. I am doing so. This is because if the closed handles are arranged side by side as in the prior art, the horizontal width of the closed scissors becomes large and the bulk becomes easy.

Further, in the case of a structure in which the handle is overlapped and closed as described above, the contours of the inside of the blade portion 11 and the outside of the handle portion 12 are substantially linear except for the vicinity of the second hinge portion H ₂ (blade). The angle formed by the contour of the part 11 and the handle part 12 is 10 ° or less), and when the folded part 12c and the inner rod part 12b are overlapped with the handle parts 12 and 12, the inner rod part 12b is on the other side. By making it the shape which does not protrude outside the collar piece 1, the closed scissors can be made slimmer.

Also, as in the present embodiment, the recess a first vicinity of the hinge portion H ₁ of the outer rod portion 12a is curved in an arc shape, the second hinge portion H ₂ is fitted when closing the handle portion 12, 12 If the portion 12d is formed, the gap between the outer rod portion 12a and the inner rod portion 12b becomes small in a state where the handle portions 12 and 12 are closed, which leads to further slimming of the scissors S.

  On the other hand, in the case of a structure in which the handle portions 12 and 12 are overlapped and closed, the engaging protrusions 12e and the engaging recesses are formed on the opposing surfaces of the handle portions 12 and 12 of the collar piece 1 and 1 as in this embodiment. 12f can be provided so that the handle portions 12 and 12 can be locked in an overlapped state, which makes it easy to carry and store the scissors S in the closed state.

“Example 2”
Next, a second embodiment of the present invention will be described below with reference to FIGS. In Example 2, the shape of the outer rod portion 12a of the handle portion 12 of the scissor pieces 1, and a straight shape without bending in the vicinity of the second hinge unit H _2. Thereby, since the shape of the handle | pattern part 12 can be simplified rather than Example 1, manufacture becomes easy.

  The present invention is generally configured as described above. However, the present invention is not limited to the described embodiments, and various modifications can be made within the description of “Claims”. The folded portion 12c of the handle portion 12 can be made of an elastic plastic material, elastomer material, other metal material or wood material, and the folded portion 12c is bent in a V shape instead of a U shape. The shape can also be made.

  When the same material as the outer rod portion 12a, the inner rod portion 12b, or the blade portion 11 is used for the folded portion 12c of the handle portion 12, a highly rigid plastic material, metal material, wood material, or the like is selected. Is preferred. On the other hand, when the blade part 11 and the handle part 12 or each part of the handle part 12 is composed of a plurality of members, a ceramic material can be used for each rod part of the blade part 11 and the handle part 12.

  Further, the shape of the outer rod portion 12a of the handle portion 12 does not necessarily have to be a linear shape. For example, the handle portions 12 and 12 of the scissors S can be easily grasped by forming irregularities at positions where fingers are attached. You can also Also, the material and thickness of the inner rod portion 12b need not be particularly aligned with the outer rod portion 12a.

In addition, regarding the arrangement of the second hinge part H ₂ that connects the inner rod parts 12b and 12b of the handle parts 12 and 12, the position closer to the first hinge part H ₁ than the front and rear center of the closed handle part 12 In addition, a dedicated rubber ring or the like may be attached to fix the handle portions 12 and 12 in a closed state, and any of them belongs to the technical scope of the present invention.

  For a long time, scissors have been used as a tool for cutting paper and thread, and are now one of the daily necessities. However, despite the opportunity to use it in various situations in daily life, the scissors were inferior in portability to the cutter, which is the same cutting tool.

  Under such circumstances, the two-axis opening / closing mechanism of the scissors of the present invention not only improves the operability and durability of the scissors but also allows the scissors in a closed state to be carried in a pencil case or a pocket of clothes. Since this is a useful technology that can be downsized, its industrial utility value is very high.

1 piece
11 Blade
12 Handle
12a Outer rod part
12b Inner rod part
12c Folding part
12d hollow
12e Locking projection
12f Locking recess S Scissors H ₁ First hinge part H ₂ Second hinge part C Center line

Claims (7)

A pair of hooks (1) and (1) crossed in an X shape are provided with a blade part (11) on the working point side and a handle part (12) on the force point side, and both hooks (1) and (1) In the scissors (S) opening and closing mechanism formed by connecting the blade portion (11) and the handle portion (12) with a first hinge portion (H ₁ ),
An outer rod portion (12a) connected to the blade portion (11) and a handle portion (12) of the flange piece (1); an inner rod portion (12b) disposed along the inside of the outer rod portion (12a) The inner rod portion (12b) and the outer rod portion (12a) are connected on the opposite side of the blade portion (11), and a folded portion formed into a U shape or a V shape using an elastic material. (12c)
The inner rod portions (12b) and (12b) of the pair of flanges (1) and (1) are hinge-connected at the distal end side, and the second hinge portion (H ₂ ) is connected to the closed blade edge and the first hinge. in position on the part (H ₁₎ center line connecting (C), and, by than the front and rear center of the closed handle (12) is arranged at the position of the first hinge portion (H ₁₎ closer,
When the handle (12) (12) of the pair of hooks (1) (1) is closed, the positional relationship between the outer rod part (12a) and the inner rod part (12b) rotating at different fulcrums changes, and the folding A scissors biaxial opening / closing mechanism, wherein the handle (12c) is bent and deformed to bias the handle (12) (12) in the opening direction.   Using a bent metal or plastic bar for the handle (12) of the collar piece (1), the outer rod (12a), inner rod (12b) and folded portion (12c) are a single member. The scissors biaxial opening and closing mechanism according to claim 1, wherein   3. The scissors biaxial opening and closing mechanism according to claim 2, wherein the blade portion (11) main body and the handle portion (12) of the flange piece (1) are formed of a single member made of the same material.   Each of the handle portions (12) and (12) of the collar piece (1) (1) has a shape in which the handles overlap when the handle portions (12) and (12) are closed. 4. A scissors biaxial opening and closing mechanism according to any one of 3 above. In the shape of the collar piece (1), the inner contour of the blade portion (11) and the outer contour of the handle portion (12) are made to be substantially straight except for the vicinity of the second hinge portion (H ₂ ), and further folded. The part (12c) and the inner rod part (12b) have a shape in which the inner rod part (12b) does not protrude outside the flange piece (1) on the other side when the handle parts (12) and (12) are overlapped. 5. A scissors biaxial opening / closing mechanism according to claim 4,   In the pair of hooks (1) (1), the handle (12) (1) is provided with a locking projection (12e) and a locking recess (12f) on the opposing surface of each handle (12) (12). 12) The scissors biaxial opening and closing mechanism according to claim 4 or 5, wherein the scissors can be locked in a state where they are overlapped with each other. When the handle portion (12) of the collar piece (1) is closed by bending the vicinity of the first hinge portion (H ₁ ) of the outer rod portion (12a) in an arc shape. second hinge portion (H ₂₎ scissors biaxial closure mechanism according to any one of claims 1 to 6, characterized in that the formation of the portion recess Komu fitting (12d) to.