JP5323665B2 - scissors - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide scissors in which the loosening of a bolt and a nut is suppressed, iron pieces do not rattle, and opening/closing operation can be smoothly done. <P>SOLUTION: The scissors 1 include a circular first hole part 15 and a circular second hole part 25 bored through a first scissor piece 10 and a second scissor piece 20 respectively, a supporting shaft part P threaded through the first hole part and the second hole part, and a first recessed part 16 formed around the periphery of the first hole part, a bolt 40 includes a bolt head part 41 at one end of a circular bolt shaft part 42, a nut 30 includes a nut head part 31 at one end of a circular nut shaft part 32, the support shaft part is formed of the bolt shaft part and the nut shaft part screwed with each other, one of bolt head part and the nut head part is a specially shaped head part h of a circular shape in which the outer shape of a crosssection perpendicular to a shaft axis z of the support shaft part has a noncircular shape or the center does not coincide with the shaft axis, and the first recessed part is formed into such a shape and such a size that the specially shaped head part is detachably inwardly fitted. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a scissors in which a pair of scissors pieces are assembled with bolts and nuts.

  Some heels, such as those for stationery, have a pair of heel pieces that are separably assembled by a support shaft. For adjustment, a pair of hooks are assembled so as to be separable by bolts and nuts. Conventionally, a bag 100 having the configuration illustrated in FIG. 8A is used as such a bag. This is because a bolt 140 is provided with a prism portion 141 and a cylindrical portion 142, one of the collar pieces 110 has a square through hole (square hole 111), and the other collar piece 120 has a circular through hole (circular hole 121). The bolt 140 is inserted into the circular hole 121 and the square hole 111 and then fastened by the nut 130. In addition, here, in order to suppress the protrusion of the nut 130 from the flange piece 110, a configuration in which the concave portion 112 in which a part of the nut 130 is embedded is provided at the periphery of the square hole 111 is illustrated. .

  By adopting the above configuration, the prismatic portion 141 of the bolt 140 is fitted into the square hole 111 and acts as a detent of the bolt 140 with respect to the flange piece 110, so that loosening of the bolt 140 and the nut 130 can be suppressed. Further, as shown in FIG. 8 (b), the nut 130b includes a rectangular column part 131 and a cylindrical part 132, which are inserted into the circular hole 121 and the rectangular hole 111 and then fastened with a bolt 140b. The effect is obtained.

  However, a clearance is usually provided between the square hole and the prism portion. For this reason, there is a problem that the prism portion rotates somewhat in the square hole, and does not rotate smoothly, and the scissors are rattled in accordance with the opening / closing operation.

  As a solution to this problem, when the prism is provided on the bolt, the bottom of the nut is tapered, and the bottom of the recess provided on the periphery of the rectangular hole is inclined to match the taper. It has been proposed (see Patent Document 1). This is intended to reduce the rattling of the flange piece by bringing the tapered surface of the nut into contact with the inclined surface at the bottom surface of the recess. However, the process of precisely providing the intended inclination on the bottom of the nut and the bottom of the recess is complicated and time-consuming.

  Accordingly, in view of the above circumstances, the present invention is to provide a kite that can be smoothly opened and closed without loosening of the rod piece while the bolts and nuts are prevented from loosening with a simple configuration. It is what.

  In order to solve the above-mentioned problems, the scissors according to the present invention are: “the first scissors piece and the second scissors piece are assembled by bolts and nuts at the respective pivotally attached portions, A circular first hole formed through and penetrating the pivot part, a circular second hole formed through the pivot part of the second collar piece, and the first hole Formed on the periphery of the first hole on the surface opposite to the surface facing the second collar piece of the first collar piece The bolt has a bolt head at one end of a cylindrical bolt shaft portion having a thread formed on the outer peripheral surface, and the nut has a thread groove formed on the inner peripheral surface. A nut head portion is provided at one end of a cylindrical nut shaft portion, and the support shaft portion is connected to the bolt shaft portion and the nut shaft portion in which the screw thread and the screw groove are screwed together. One of the bolt head and the nut head is formed in a special shape head having a non-circular outer shape in a cross section perpendicular to the axis of the support shaft or a circle whose center does not coincide with the axis. The first recess is formed in a shape and a size that allow the special-shaped head to be detachably fitted.

  In the following, for convenience of explanation, when simply called “cross section”, it means “cross section perpendicular to the axis of the spindle”, and when simply called “axis”, “the axis of the spindle”. ". In addition, the “non-circular shape or a circular shape whose center does not coincide with the axial center of the support shaft portion” is a shape in which the outer shapes may not overlap before and after rotating at an arbitrary angle around the axial center. It may be referred to as “rotary non-identical shape”.

  The “pivoting part” is a portion located between the handle portion provided with the finger hole and the blade portion in each of the first and second collar pieces and intersects with the other collar piece. Point to the site.

  “The first concave portion” is “formed in a shape and size that allows the special-shaped head to be detachably fitted” means that the shape surrounded by the side surface of the first concave portion is a cross-section of the special-shaped head. It means that it is the same shape as the shape and is slightly larger than the special shape head. As a result, the special-shaped head has its outer peripheral surface abutted on the side peripheral surface of the first recess, and its bottom surface is in contact with the bottom surface of the first recess, and is fitted into the first recess.

  In the scissors of the present invention configured as described above, the outer shape of one cross section of the nut head or the bolt head is a rotational non-identical shape and is fitted in the first concave portion having the same shape, so that the first concave portion is formed. The 1st hook piece currently made becomes non-rotatable with respect to a spindle part. Thereby, a spindle part will rotate integrally with one of a pair of collar pieces, and the loosening of the volt | bolt and nut which comprise a spindle part can be suppressed.

  In addition, in the above-described conventional scissors 100, the prism portion 141 that acts as a detent needs to be formed in a size that allows the through holes (circular holes 121 and 111) to be inserted into the scissors pieces. there were. Therefore, the contact area between the prismatic part 141 and the square hole 111, that is, the area where the outer peripheral surface of the prismatic part 141 and the inner peripheral surface of the square hole 111 are not so large. On the other hand, in the present invention, the rotationally shaped non-identical shape is not a support shaft portion inserted into the through hole portions (first hole portion and second hole portion) of the flange piece, but the through hole portion. Since it is a nut head or bolt head that is not inserted into the shaft, its cross-sectional area can be set to be considerably larger than the cross-sectional area of the support shaft portion. Moreover, in the present invention, in addition to the outer peripheral surface of the special-shaped head contacting the side peripheral surface of the first recess, the bottom surface of the special-shaped head also contacts the bottom surface of the first recess. That is, the contact area due to the fitting between the special-shaped head and the first recess is considerably larger than the contact area due to the fitting between the prism portion and the square hole in the conventional scissors. Therefore, the action of the detent in the present invention is larger than that of the conventional rod, and the loosening of the bolts and nuts is more effectively suppressed.

  Moreover, in this invention, the external shape of the cross section of the shaft part which rotates the inside of a circular 1st hole part and a 2nd hole part, ie, a nut shaft part, is also circular. Therefore, unlike the conventional rod in which the prism portion rotates somewhat in the square hole, the support shaft portion smoothly rotates in the first hole portion and the second hole portion. As a result, the opening / closing operation can be smoothly performed without rattling of the flange. Furthermore, the conventional hole in the square hole is limited to wire cutting and the like, and the work is laborious. On the other hand, both the first hole and the second hole are circular. Can be easily drilled with good workability. In addition, circular holes have higher processing accuracy than square holes. Thereby, the dimension of a 1st hole part and a 2nd hole part can be controlled precisely in relation to a spindle part, and it becomes possible to rotate a spindle part more smoothly without rattling.

  Furthermore, although the outer shape of the first concave portion needs to be a non-identical rotational shape, unlike the technique of Patent Document 1, it is not necessary to provide a slope or the like on the bottom portion, and the bottom surface may be a simple flat surface. Therefore, processing is also easy. In other words, according to the present invention, one of the nut head or the bolt head is a special-shaped head, and the first recess having the same cross-sectional shape is provided, so that loosening of the bolt and nut is suppressed. In addition, it is possible to realize a bag that opens and closes smoothly.

  Moreover, when making a nut act as a detent | locking, the structure which makes the external shape of the cross section of the whole nut into a 1st recessed part as a rotation type nonidentical shape can also be considered. However, in that case, it is necessary to form the first concave portion deeply, which takes time for processing and may reduce the strength of the first hook piece. On the other hand, in the present invention, since the nut includes the nut shaft portion and the nut head portion, it is possible to obtain the anti-rotation effect only by making only the nut head portion a rotational non-identical shape. Thereby, it is not necessary to deepen the first concave portion, and processing is easy, and there is an advantage that the risk of the strength of the first collar piece being reduced can be avoided.

In addition to the above-described configuration, the scissors according to the present invention include a "second concave portion formed on the periphery of the second hole portion on a surface opposite to the surface facing the first scissors of the second scissors. And a washer having a non-circular outer shape in a cross section perpendicular to the axial center or a circular shape whose center does not coincide with the axial center, and the second recess has a shape and a size in which the washer is detachably fitted. in which "it is formed by.

  The special-type head and the washer are both of a rotational non-identical shape, but both shapes may be the same or different. Along with this, the first recess and the second recess may also be different from the case where the cross-sectional outer shape is the same.

  By inserting a "washer" between the bolt head and the second hook piece or between the nut head and the second hook piece, the second hook piece is pressed by the bolt head or the nut head. The area can be increased, and the fastening force by the bolt and nut can be securely transmitted to the second hook piece. In general, the washer used together with the bolt or the nut has an annular shape. In the present invention, the outer shape of the cross-section of the washer is a non-rotating shape, and the second recess formed on the periphery of the second hole. Is also the same shape, and a washer is fitted into the second recess. As a result, the washer cannot rotate with respect to the second collar piece, so that loosening of the bolt and nut due to the rotation of the washer can be effectively suppressed.

The scissors in the reference example are: “a second recess formed on the periphery of the second hole on the surface opposite to the surface facing the first collar of the second collar, and the second recess And an outer ring in contact with the second flange piece, and a bearing having an inner ring that is inscribed in the outer ring, rotates and rotates, and through which the support shaft portion is inserted. .

  In the “bearing”, rolling elements such as balls and rollers are interposed between the outer ring and the inner ring, and the outer ring and the inner ring are relatively rotated by the rolling of the rolling element.

  When the support shaft is inserted into the bearing having the above configuration on the opposite side of the surface facing the first flange of the second rod, the outer ring and the second rod are rotated around the spindle along with the opening / closing operation of the rod. The inner ring is less likely to follow the outer ring. Thereby, since the movement of the second hook piece is difficult to be transmitted to the support shaft portion, the loosening of the bolt and the nut due to the movement of the second hook piece is suppressed. That is, according to the present invention, in addition to preventing the bolts and nuts from loosening due to the movement of the first hook piece by rotating the support shaft portion integrally with the first hook piece, The loosening of the bolts and nuts accompanying the movement of the flange piece is also effectively suppressed.

  Moreover, since a bearing is provided in the 2nd recessed part formed in the periphery of the 2nd hole, the protrusion of the bearing from a 2nd collar piece is reduced. The shape and size of the second recess are not particularly limited as long as the bearing can be disposed therein, and the shape viewed from the direction of the axis is non-circular or the center does not coincide with the axis. Or a circle whose center coincides with the axis.

  The scissors according to the present invention may be configured such that, in the above configuration, the second recess is formed in the same shape and size as the first recess as viewed from the axial direction.

  In the bag of the present invention having the above-described configuration, it is possible to use the specially shaped head in the first recess and to use the specially shaped head in the second recess. That is, in the case of a bag with a washer, in addition to the combination of fitting the special-shaped head in the first recess and fitting the washer in the second recess, the special-shaped head is fitted in the second recess. The use by the reverse combination of fitting a washer into the recess is also possible. In addition, in the case of a cage with a bearing, in addition to the combination of the special-shaped head fitted in the first recess and the bearing arranged in the second concave, the special-shaped head is fitted in the second recess. The use by the reverse combination of arranging a bearing in one recess is also possible. Accordingly, both the use of rotating the support shaft portion integrally with the first hook piece and the use of rotating the support shaft portion integrally with the second hook piece are possible.

  In addition, there are two types of scissors: a type in which the handle lengths and shapes of the pair of scissors pieces are different (offset type) and a type in which the pair of hand grip portions are symmetrical in shape (reverse type). Therefore, if it is a symmetrical ridge, it can be used without rotating the first hook piece with respect to the spindle by inserting the special-shaped head in the first recess, and the special shape in the second recess. By fitting the head and changing the left and right sides of the collar, the second collar piece can be used without rotating with respect to the support shaft.

  In addition, it manufactures a piece of the same shape without distinguishing between the first piece and the second piece, an arbitrary piece with a special-shaped head fitted in the recess, and a washer or bearing in the recess It can be used as a bag of the present invention by assembling with an arbitrary piece provided with. This facilitates the management of products and semi-finished products in the manufacture of straw.

  The scissors according to the present invention may be configured such that, in the above configuration, "the special shape head is the nut head, and an opening at one end of the nut shaft portion is covered with the nut head". .

  In a general nut, a hole in which a thread groove is formed penetrates in the axial direction. On the other hand, in the present invention, one end portion of the nut shaft portion is covered with the nut head portion. In other words, the nut shaft portion in which the thread groove is formed is not opened in the special shape head that is the nut head. As a result, it is possible to prevent chips, dust, and the like of an object to be cut such as hair from entering the support shaft portion. Moreover, since the external appearance of the specially shaped head is improved because the screw groove is not exposed, the specially shaped head that acts as a detent can function as a decorative part. Here, it is preferable that the special-shaped head has a rotationally non-identical shape such as a heart shape, a drop shape, or a flower shape and a shape with high designability. In addition, if a material with a different material or color from the piece, such as resin, glass, ceramics, ore, or wood, is used for the special-shaped head, the function as a decorative part can be more effectively exhibited, and more suitable. It is.

  As described above, as an effect of the present invention, there is provided a scissor that can be smoothly opened and closed without loosening of a scissors piece, while preventing loosening of bolts and nuts with a simple configuration. Can do.

It is a disassembled perspective view (the figure looked down from the 1st hook piece side) of the scissors of 1st embodiment of this invention. It is a disassembled perspective view (figure looked up from the 2nd collar piece side) of the collar of FIG. It is the rear view of the state which removed (a) front view, (b) rear view, and (c) washer and bolt of the ridge of FIG. (A) Exploded perspective view (viewed from the bolt side) and (b) Exploded perspective view (viewed from the nut side) illustrating the bolt and nut when the special-shaped head is a bolt head. . It is a front view explaining a bag with a symmetrical handle part. It is sectional drawing of the pivot attachment part of the collar of a reference example . It is a figure which illustrates other forms of a special form head. (A) The disassembled perspective view of the conventional scissors, (b) It is a disassembled perspective view which shows the other form of the spindle part in the conventional scissors.

  Hereinafter, the bag 1 which is one embodiment for carrying out the present invention will be described with reference to FIGS. 1 to 3. The scissors 1 are composed of a first scissor piece 10 having a handle portion 11 and a blade portion 12, and a second scissors piece 20 having a handle portion 21 and a blade portion 22, with bolts 40 at respective pivotal portions 13 and 23. It is the collar 1 assembled | attached by the nut 30, Comprising: The circular 1st hole part 15 pierced and penetrated to the pivoting part 13 of the 1st collar piece 10, and the pivoting part 23 of the 2nd collar piece 20 A circular second hole 25 that is drilled through, the first hole 15 and the support shaft part P that is inserted through the second hole 25, and the second collar piece 20 of the first collar piece 10 facing each other. And a first recess 16 formed on the periphery of the first hole 15 on the surface opposite to the surface to be formed. The bolt 40 has a bolt head 41 at one end of a cylindrical bolt shaft portion 42 having a thread formed on the outer peripheral surface, and the nut 30 has a cylindrical shape with a thread groove formed on the inner peripheral surface. A nut head portion 31 is provided at one end of the nut shaft portion 32, and the support shaft portion P is formed by a bolt shaft portion 42 and a nut shaft portion 32 in which a screw thread and a screw groove are screwed together. In addition, the nut head 31 is a special-shaped head h whose outer shape in a cross section perpendicular to the axis z of the support shaft portion P is non-circular or whose center does not coincide with the axis z. Is formed in a shape and size that allows the special-shaped head h to be detachably fitted.

  In addition to the above-described configuration, the collar 1 of the first embodiment is formed on the periphery of the second hole 25 on the surface of the second collar piece 20 opposite to the surface facing the first collar piece 10. The second recess 26 further includes a washer 50 having a non-circular outer shape in a cross section perpendicular to the axial center z or a circular shape whose center does not coincide with the axial center z. It is formed in a shape and size to be fitted. Further, in the present embodiment, the special-shaped head h and the washer 50 have the same cross-sectional outer shape perpendicular to the axis z, and the second recess 26 has a shape and size as viewed from the direction of the axis z. Is formed in the same manner as the first recess 16.

  More specifically, the diameters of the circular first hole portion 15 and the second hole portion 25 are set to be slightly larger than the outer diameter of the cylindrical nut shaft portion 32. Moreover, in this embodiment, although the nut head 31 is made into the special shape head h among the bolt head 41 and the nut head 31, the external shape of the cross section is a heart shape. In particular, the special-shaped head h of the present embodiment has a heart-shaped maximum width that is about twice as large as the outer diameter of the nut shaft portion 32. The nut head 31 is made of a metal, thin plate-shaped head base 31a that is integrally formed with the nut shaft 32 and covers an opening at one end of the nut shaft 32, and an upper surface (nut shaft) of the head base 31a. And a decorative portion 31b laminated on the surface opposite to the portion 32). The decoration portion 31b is different in color and material from the first collar 10 and the second collar piece 20, and can be given the brand mark of the collar 1.

  On the other hand, the bolt head 41 is circular with a larger diameter than the first hole 15 and the second hole 25. The washer 50 is a metal thin plate, and the outer shape thereof is the same heart shape as the outer shape of the cross section of the nut head portion 31 (special shape head portion h), and the first hole portion 15 and the second hole portion 25 are A circular through hole 51 having the same diameter is formed.

  The first flange 10 has a surface facing the second flange 20 on the periphery of the first hole 15, and the second flange 20 has a second hole 25 on the surface facing the first flange 10. Are provided with annular recesses 19 and 29 for accommodating annular members (not shown), respectively.

  The scissors 1 having the above-described configuration has the nut head portion 31 (special-shaped head portion h) fitted into the first recess 16 in the first scissor piece 10, and the nut shaft portion 32 is connected to the first hole portion 15 and the second hole portion. In the second collar piece 20, the washer 50 is fitted into the second recess 26 in the second collar piece 20, and the bolt shaft portion 42 is inserted into the through-hole of the washer 50 so that the bolt head 41 is in contact with the washer 50. 51 and the second hole portion 25 of the second flange piece 20, and the screw groove of the nut shaft portion 32 and the screw thread of the bolt shaft portion 42 are screwed together so that the bolt 40 and the nut 30 can The piece 10 and the second collar piece 20 can be assembled.

  At this time, the nut head 31 (special-shaped head h) has a heart shape whose outer shape of the cross section is a rotational non-identical shape, and is fitted in the first recess 16 of the same shape, so that the bolt shaft The support shaft portion P configured by the portion 42 and the nut shaft portion 32 rotates integrally with the first collar piece 10, and the loosening of the bolt 40 and the nut 30 is suppressed. In particular, in this embodiment, since the cross-sectional area of the nut head 31 (special-shaped head h) is set to be quite large, the contact area with the outer peripheral surface and the bottom surface of the first recess 16 is large, and it acts as a detent. The effect is high.

  In addition, since the washer 50 whose cross-sectional outer shape is a non-identical rotational shape is fitted in the second concave portion 26 having the same shape, the washer 50 cannot rotate with respect to the second collar piece 20, and the washer The loosening of the bolt 40 and the nut 30 due to the rotation of 50 is also effectively suppressed.

  Further, since the outer shape of the cross section of the support shaft portion P (the outer shape of the cross section of the nut shaft portion 32) is circular, the support shaft portion P rotates smoothly in the circular first hole portion 15 and second hole portion 25. . Thereby, the opening / closing operation | movement of the collar 1 can be performed smoothly, without the 1st collar piece 10 and the 2nd collar piece 20 rattling.

  In addition, since the nut shaft portion 32 is not opened in the nut head portion 31 (special-shaped head portion h), in addition to preventing chips and dust from entering the support shaft portion P, the screw groove Is not exposed, the appearance of the nut head 31 (special head h) is good. In particular, in the present embodiment, the top surface of the nut head 31 is provided with a decorative portion 31b made of a material different from that of the first rod 10 and the second rod piece 20, so that the nut head can act as a detent. 31 (special-shaped head h) effectively exhibits the decorative function.

  In the scissors 1 described above, the nut head 31 is exemplified as the special-shaped head h. However, as another embodiment, as shown in FIG. 4, a bolt head 46 that is the special-shaped head h is provided. The support shaft portion P can be formed by screwing the bolt shaft portion 47 of the bolt 45 and the nut shaft portion 37 of the nut 35 having the nut head portion 36 that is not fitted into the recess. The other configuration is the same as that of the hook 1 described above, and in the first hook piece 10, a bolt head 46 (special-shaped head h) is fitted into the first recess 16, and the bolt shaft portion is inserted from the first hole 15. 47 is protruded, and the washer 50 is fitted into the second recess 26 in the second collar piece 20, and the nut shaft portion 37 is inserted into the through hole 51 of the washer 50 so that the nut head portion 36 abuts the washer 50. The bolt 45 and the nut 35 are inserted into the second hole 25 and the first hole 15 and the screw groove of the nut shaft portion 37 and the screw thread of the bolt shaft portion 47 are screwed together. The piece 10 and the second collar piece 20 can be assembled.

  Further, in the above-described scissors 1, the first concave portion 16 and the second concave portion 26 have the same shape and size, and the special shape head h and the washer 50 have the same cross-sectional shape. It is also possible to fit the shaped head h and fit the washer 50 in the first recess 16 for use. As described above, when the special-shaped head h and the washer 50 are replaced, as shown in FIG. 5, the first collar piece 10b and the second collar piece 20b are symmetrical in the case of the collar 2. , Especially significant. Specifically, the special-shaped head h is fitted in the first recess 16 and the washer 50 is fitted in the second recess, and the first collar 10b is used as being unrotatable with respect to the support shaft P. In addition, the left and right sides are changed, and a special-shaped head h is fitted in the second recess 26 and the washer 50 is fitted in the first recess 16 so that the second collar piece 20b cannot be rotated with respect to the support shaft P. Can be used.

Next, the scissors of the reference example will be described with reference to FIG. About the structure similar to 1st embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. Here, the difference from the first embodiment is that not the washer 50 but the bearing 60 is disposed in the second recess 26. Specifically, the bearing is in contact with the second collar piece 20 in the second recess 26, and rotates while being inscribed in the outer ring 61 and the bolt shaft portion 42 (support shaft portion P) is inserted. An inner ring 62 is provided. Further, as the bolt, a bolt head 41b that gradually decreases in diameter toward the bolt shaft portion 42, that is, a bolt head that does not contact the outer ring 61 when the bolt shaft portion 42 is inserted into the inner ring 62. A bolt 40b having 41b is used. In FIG. 6, rolling elements such as balls and rollers interposed between the outer ring 61 and the inner ring 62 are omitted. Further, FIG. 6 does not accurately illustrate the dimensional ratio between the components, such as the depth of the first concave portion 16 and the second concave portion 26 with respect to the thickness of the first collar piece 16 and the second collar piece 26.

  With such a configuration, even when the outer ring 61 of the bearing 60 is rotated by rotating the second rod piece 20 around the support shaft z in accordance with the opening / closing operation of the rod, the inner ring 62 is moved by the action of the rolling elements. Since it is difficult to follow, the rotational movement of the second collar piece 20 is difficult to be transmitted to the bolt shaft portion 42. As a result, the nut head 31 (special-shaped head h) having a non-identical rotational shape is fitted into the first recess 16, whereby the support shaft constituted by the bolt shaft portion 42 and the nut shaft portion 32. The action of the part P rotating integrally with the first collar piece 10 becomes more reliable, and the loosening of the bolt 40 and the nut 30 is more effectively suppressed.

  If the outer ring 16 is provided with a flange 61f and a coil spring (not shown) is interposed between the flange 61f and the second collar piece 20 (the bottom surface of the second recess 26), a bearing for the second collar piece 20 is provided. It is preferable that the rattling of 60 can be prevented and the first hook 10 and the second hook 20 can be pivoted without excessively tightening the bolt 40b and the nut 30.

  Since the first concave portion 16 and the second concave portion 26 have the same shape and size as viewed from the direction of the axial center z, a special shape head is formed in the second concave portion 26 as in the case of the collar of the first embodiment. It is possible to fit the portion h and arrange the bearing 60 in the first recess 16 for use.

  The present invention has been described with reference to a preferred embodiment. However, the present invention is not limited to this embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention as described below. Design changes are possible.

  For example, in the above embodiment, the case where the cross-sectional outlines of the special-shaped head h and the washer 50 are heart-shaped is illustrated, but the rotational shape is not identical, that is, before and after rotating around the axis z by an arbitrary angle. As long as the outer shapes do not overlap with each other, the shape is not limited to a heart shape. For example, as shown in FIG. 7A, a circular special-shaped head h2 whose center does not coincide with the axis z can be used. It can also be non-circular, for example, as shown in FIGS. 7 (b) to (g), specially shaped heads h3, h4, oval, drop, flower, rhombus, quadrangle, and triangle, respectively. h5, h6, h7, h8. The broken lines in the figure indicate the inner peripheral surface of the nut shaft when the special-shaped head is a nut head, or the outer peripheral surface of the bolt shaft when the special-shaped head is a bolt head. .

  In addition, in the above, the case where the cross-sectional shapes of the special-type head and the washer are the same is shown. However, the present invention is not limited to this, and the special-type head and the washer are non-identical shapes, respectively. It can also be made into the shape which is not. In this case, the special shape head and washer provide a detent effect for the bolts and nuts, and the design is different and different when viewed from the first collar side and from the second collar side. Can be a habit of giving.

1, 2 鋏 10, 10 b First hook piece 13, 23 Pivoting portion 15 First hole portion 16 First recess portion 20, 20 b Second hook piece 25 Second hole portion 26 Second recess portion 30, 35 Nut 31, 36 Nut Head 32, 37 Nut shaft (support shaft P)
40, 45 Bolt 41, 46 Bolt head 42, 47 Bolt shaft (support shaft P)
50 Washer 60 Bearing 61 Outer ring 62 Inner ring h, h2, h3, h4, h5, h6, h7, h8 Special head z axis

JP 2007-325690 A

Claims (3)

The first hook and the second hook are bolts and nuts assembled at the respective pivots;
A circular first hole penetrating through the pivot part of the first hook piece;
A circular second hole penetrating through the pivot part of the second hook piece;
A support shaft inserted through the first hole and the second hole;
A first recess formed on a peripheral edge of the first hole on a surface opposite to the surface facing the second collar piece of the first collar piece ;
A second recess formed on the periphery of the second hole on the surface opposite to the surface facing the first collar of the second collar;
A washer for inserting the support shaft ,
The bolt has a bolt head at one end of a cylindrical bolt shaft portion having a thread formed on the outer peripheral surface,
The nut has a nut head at one end of a cylindrical nut shaft portion in which a thread groove is formed on the inner peripheral surface,
The support shaft portion is formed by the bolt shaft portion and the nut shaft portion in which the screw thread and the screw groove are screwed together,
One of the bolt head and the nut head is a special-shaped head whose outer shape in a cross section perpendicular to the axis of the support shaft is non-circular or whose center does not coincide with the axis.
The first recess is formed in a shape and size that allows the special-shaped head to be detachably fitted ,
The washer has a non-circular outer shape of a cross section perpendicular to the axis or a circle whose center does not coincide with the axis;
The collar is characterized in that the second recess is formed in a shape and a size in which the washer is detachably fitted . The scissors according to claim 1, wherein the second recess is formed in the same shape and size as the first recess as viewed from the axial direction . The special form head is the nut head, the opening of one end of the nut shank of claim 1 or claim 2, characterized in <br/> be covered by the nut head scissors.

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