JP2015030992A - Connection structure of operation chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce processing manhours and the number of part items by a metal mold, by manufacturing first and second connection pieces respectively formed in the same shape and also becoming the substantially same external shape as a bowl part by uniting, by a single molding metal mold.SOLUTION: An operation chain 11 for fixing a plurality of bowl parts 13 at an interval to a single code part 12, is formed in an endless ring shape by connecting its both ends by a connection member 20. The connection member is composed of a first connection piece 21 having a substantially U-shaped first connection body 21a and installing a base part on one end of the operation chain and a second connection piece 22 having a substantially U-shaped second connection body 22a and installing a base part on the other end of the operation chain and formed in the same shape as the first connection piece. The tips of the first and second connection pieces are mutually opposed, and when the first and second connecting pieces are engaged and united in a state of rotating the first or second connection piece by 90 degrees around the axis of the code part, external shapes of the first and second connection pieces are constituted so as to become the substantially same shape as the external shape of the bowl part.

Description

  The present invention relates to a connecting structure for connecting both ends of an operation chain that is operated when opening and closing a roll screen, a horizontal blind, a vertical blind, and the like into an endless ring shape.

  Conventionally, a ball chain configured to be endless by connecting both ends of a cord with a connecting portion has been disclosed (for example, see Patent Document 1). In this ball chain, synthetic resin balls are formed at equal intervals on a polyester cord. These balls are formed by forming an oblong solid body on the surface of the cord with a molding machine, and are fixed to the cord so as not to move. Moreover, a connection part is comprised by the 1st connection member and the 2nd connection member. The first connecting member includes a connecting cord formed of the same material as the cord, a hemispherical portion that is outsert-molded at one end of the connecting cord and shaped slightly larger than a half of the ball on the cord, and is connected to the other end of the connecting cord. It has a first fitting part that is molded into a solid body up to the tip. Here, the interval between the hemispherical portion and the first fitting portion is the same as the interval between the balls on the cord. Further, the base end portion of the first fitting portion is formed in a hemispherical shape similar to the end portion of the ball on the cord, and a round shaft-like fitting protrusion is formed at the tip portion of the first fitting portion. A flange-like enlarged diameter portion is formed at the distal end portion of the fitting projection, and the outer shape of the enlarged diameter portion is smaller than the maximum diameter of the hemispherical base end portion.

  The second connecting member includes a connecting cord formed of the same material as the cord, a hemispherical portion formed on one end of the connecting cord and having a half ball shape on the cord, and a second cord formed on the other end of the connecting cord. And a fitting portion. Here, the interval between the hemispherical portion and the second fitting portion is the same as the interval between the balls on the cord. The base end portion of the second fitting portion is formed in a hemispherical shape similar to the end portion of the ball on the cord, and a fitting hole is formed in the tip portion of the second fitting portion. The diameter of the back portion of the fitting hole is formed to be larger than the diameter of the opening portion, and is configured to be able to elastically fit and hold the expanded diameter portion of the fitting protrusion. Further, only when a tensile force exceeding the normal tensile force acts on the ball chain, the fitting protrusion and the fitting hole are disengaged due to the elasticity of the synthetic resin. Furthermore, in the state where the fitting protrusion is fitted in the fitting hole, the outer shape of the first and second fitting portions is configured to be the same shape as the ball on the cord.

  In the ball chain configured as described above, the hemispherical portion of the first connecting member and the hemispherical portion of the second connecting member are welded and fixed to the hemispherical portions formed at both ends of the cord, respectively, so that it is the same as the ball on the cord. Each shaped ball is formed. When the fitting protrusion is fitted into the fitting hole, an endless ball chain is formed. As a result, since the balls having the same shape are formed at the same interval over the entire length of the cord of the ball chain, the coupling cord of the first coupling member, and the coupling cord of the second coupling member, the ball chain can circulate around the pulley without restriction. It has become.

  On the other hand, in order to construct an endless ball chain, a cord in which both end portions are connected by a connecting portion is disclosed (for example, see Patent Document 2). In this ball chain, synthetic resin balls are formed at equal intervals on a polyester cord. These balls are formed by forming an oblong solid body on the surface of the cord with a molding machine, and are fixed to the cord so as not to move. Moreover, the said connection part is equipped with two 1st connection members comprised similarly, and the cylindrical 2nd connection member (2nd fitting part) which connects these 1st connection members. The first connecting member includes a connecting cord formed of the same material as the cord, a hemispherical portion of a half-shaped ball outsert-molded at one end of the connecting cord, and a first end formed at the other end of the connecting cord. And a ball that is fixed between the hemispherical portion and the first fitting portion and is formed in the same shape as the ball of the cord. Here, the interval between the first fitting portion and the ball and the interval between the ball and the hemispherical portion are the same as the interval between the balls on the cord. The base end portion of the first fitting portion is formed in a hemispherical shape similar to the end portion of the ball on the cord, and a round shaft-like fitting protrusion is outsert on the tip portion of the first fitting portion. Molded. On the outer peripheral surface of the front end portion of the fitting projection, an enlarged diameter portion is formed in line symmetry with respect to the center of the round shaft.

  The second connecting member is formed as a second fitting portion having a fitting hole that is formed in a cylindrical shape with the same synthetic resin as the first fitting portion and the ball, and has openings on both sides of the second fitting portion. Is formed in a bowl shape in which a distal end portion including an enlarged diameter portion of the fitting protrusion can be inserted. Also, only when a large pulling force exceeding the normal pulling force is applied to the ball chain, the opening of the second connecting member is expanded by the expanded diameter portion of the fitting protrusion due to the elasticity of the synthetic resin of the second connecting member. Thus, the fitting protrusion is disengaged from the second connecting member. Furthermore, the outer shape in a state where the fitting protrusions of the first fitting portion are respectively fitted to both ends of the second connecting member is configured to be the same shape as the ball on the cord.

  In the cord configured as described above, the ball having the same shape as the ball on the cord is formed by welding and fixing the hemispherical portions of the two first connecting members to the hemispherical portions formed outsert-molded at both ends of the cord. Is done. When the two first connecting members (fitting protrusions of the first fitting portion) are connected by the cylindrical second connecting member (second fitting portion), an endless ball chain is formed. As a result, since the balls having the same shape are formed at the same interval over the entire length of the cord of the ball chain and the coupling cords of the two first coupling members, the ball chain can circulate without restriction with respect to the pulley.

JP 2011-6923 A (paragraphs [0022] to [0024], [0026] to [0030], [0032], [0033], FIGS. 2 to 6) Japanese Patent Laying-Open No. 2011-6925 (paragraphs [0020] to [0024], [0026], [0030] to [0032], FIGS. 2 to 6)

  However, in the conventional ball chain shown in Patent Document 1, a male-shaped first connecting member in which a fitting protrusion is formed and a female shape in which a fitting hole to be fitted in the fitting protrusion is formed. Since two types of connecting members with the second connecting member are required, it is necessary to separately manufacture the molds for these connecting members and to form the above two types of connecting members separately. As the number of parts increases, there is a problem that the number of parts increases and parts management becomes troublesome. Further, in the cord shown in the above-mentioned conventional patent document 2, two identical first connecting members each having a fitting protrusion and a fitting hole in which these fitting protrusions are fitted are formed. Since two types of connecting members with a single cylindrical second connecting member are required, a molding die for the first and second connecting members is prepared separately, and the three connecting members are replaced with the two types of connecting members. There is a problem in that it has to be molded separately with a molding die, which increases the number of processing steps and increases the number of parts, which complicates parts management. Furthermore, in the conventional ball chain shown in Patent Document 1, the hemispherical portion of the first connecting member and the hemispherical portion of the second connecting member are welded and fixed to the hemispherical portions formed at both ends of the cord, respectively. When it becomes necessary to shorten the length of the ball chain after these welding and fixing, it is necessary to divide one of the two welding fixing parts to make a hemispherical part again, and then the ball chain has a predetermined dimension. To form a hemispherical portion at the end of the ball chain, and the hemispherical portions must be welded and fixed again, and it takes a lot of man-hours to shorten the length of the ball chain. There was a problem that difficulty was also high. The cord shown in the conventional patent document 2 also has a problem that requires a lot of man-hours to shorten the length of the cord.

  The first object of the present invention is to form the first and second connecting pieces which are formed in the same shape and are combined and have substantially the same outer shape as the ball portion with a single molding die. Another object of the present invention is to provide an operation chain connection structure that can reduce the number of parts. The second object of the present invention is to connect the operation chains, which can be shortened relatively easily even after the first and second connecting pieces are engaged to form an endless ring. To provide a structure.

  The first aspect of the present invention is, as shown in FIGS. 1 to 4, a single cord portion 12 formed in a string shape and a plurality of balls fixed at intervals in the longitudinal direction of the cord portion 12. In an operation chain coupling structure including an operation chain 11 having a portion 13 and a coupling member 20 formed by connecting both ends of the operation chain 11 to form an endless ring, the coupling member 20 has a circular outer peripheral surface. A first connection piece 21 having a substantially U-shaped first connection main body 21a formed in an arc shape and having a base portion attached to one end of the operation chain 11, and a substantially U-shape whose outer peripheral surface is formed in an arc shape. A second connecting piece 22 having a second connecting body 22a and a base attached to the other end of the operation chain 11 and formed in the same shape as the first connecting piece 21; The first or second connecting piece with the tips of 22 facing each other When either one of the first and second connecting pieces 21 and 22 is engaged with each other in a state where either one of the first and second connecting pieces is rotated 90 degrees around the axis of the cord portion 12, the first and second The outer shape of the connecting pieces 21 and 22 is configured to be substantially the same as the outer shape of the ball portion 13.

  The second aspect of the present invention is an invention based on the first aspect, and as shown in FIGS. 1 to 3, the first connecting piece 21 is formed at the base of the first connecting body 21 a and is a cord portion. The first through hole 21b that can be loosely fitted to one end of the twelve and a pair of elastically deformable first locking portions 21c and 21c formed at both ends of the first connecting body 21a, respectively. The two connecting pieces 22 are formed at the base of the second connecting body 22a and elastically deformed respectively at the second through hole 22b that can be loosely fitted to the other end of the cord part 12 and at the tip of the second connecting body 22a. A pair of second locking portions 22c, 22c that can be paired, and a pair of first locked portions that can be locked to the first connecting piece 21 by elastic deformation of the pair of second locking portions 22c, 22c. 21d and 21d are formed, respectively, and a pair of first locking portions 21c and 21c are formed on the second connecting piece 22. Elastically deformed, characterized in that the lockable pair of second engaging portion 22 d, 22 d are formed respectively.

  3rd viewpoint of this invention is invention based on 2nd viewpoint, Comprising: As further shown in FIG.1 and FIG.2, the code | cord | chord part 12 in which the 1st through-hole 21b of the 1st connection piece 21 was loosely fitted. A cord portion in which a first retaining portion 12a that prevents the first connecting piece 21 from being detached from one end of the cord portion 12 is formed at one end of the cord, and the second through hole 22b of the second connecting piece 22 is loosely fitted. A second retaining portion 12 b that prevents the second connecting piece 22 from being detached from the other end of the cord portion 12 is formed at the other end of the cord 12.

  4th viewpoint of this invention is invention based on 3rd viewpoint, Comprising: As shown in FIG.1 and FIG.2, at least the code | cord | chord part 12 among the operation chains 11 is formed with a thermoplastic resin, The retaining portion 12a is a first flange portion having a larger diameter than the cord portion 12 by thermally deforming one end of the cord portion 12, and the second retaining portion 12b thermally deforms the other end of the cord portion 12. It is the 2nd flange part formed in the larger diameter than the code | cord | chord part 12, It is characterized by the above-mentioned.

  A fifth aspect of the present invention is an invention based on the third aspect, wherein the first retaining portion is a first knot formed at one end of the cord portion, and the second retaining portion is the cord portion. It is the 2nd knot formed in the other end, It is characterized by the above-mentioned.

  A sixth aspect of the present invention is an invention based on the third aspect, wherein the first retaining portion is a first caulking portion formed by caulking a metal plate or a metal ring at one end of the cord portion. And the second retaining portion is a second caulking portion formed by caulking a metal plate or a metal ring to the other end of the cord portion.

  In the operation chain connection structure according to the first aspect of the present invention, the first and second connection pieces are formed in the same shape, and the connection pieces are combined so as to have substantially the same outer shape as the ball portion. Therefore, the first and second connecting pieces can be produced with a single molding die, the number of processing steps by the die can be reduced, and the number of parts can be reduced.

  In the operation chain connection structure according to the second aspect of the present invention, if the pair of second locking portions of the second connection piece is elastically deformed and locked to the pair of first locked portions of the first connection piece. Inevitably, the pair of first locking portions of the first connecting piece is elastically deformed and locked to the pair of second locked portions of the second connecting piece. Thus, the first and second connecting pieces can be combined.

  In the operation chain connection structure according to the third aspect of the present invention, a first retaining portion is formed at one end of the cord portion in which the first through hole of the first connection piece is loosely fitted, and the second connection piece second. Since the second retaining portion is formed at the other end of the cord portion in which the through hole is loosely fitted, in this state, the second retaining portion is elastically deformed and retained in the first retaining portion, and the second If the first locking portion is elastically deformed and locked to the locking portion, the first and second connecting pieces can be engaged and the operation chain can be made into an endless ring shape. Even after the first and second connecting pieces are engaged to form an endless ring, the length of the operation chain can be relatively easily reduced by the following simple operation. First, the first and second connecting pieces are disengaged, one of the first and second retaining portions is cut from the cord portion, the first or second connecting pieces are removed, and then the entire length of the operation chain. The ball part on the removal side is crushed and removed, and then the cord part is cut, and then the first or second through hole of the removed first or second connecting piece is removed so that the desired length is obtained. 1st or 2nd retaining part is formed at the tip of this removal-side cord part, and the second locking part is elastically deformed and locked to the first locked part. Then, the first locking portion is elastically deformed and locked to the second locked portion. As a result, the first and second connecting pieces are engaged with each other so that the operation chain can be made into an endless ring shape again.

(A) is the sectional view on the AA line of FIG. 3 which shows the state before engaging the 1st connection piece and the 2nd connection piece of the operation chain of this invention embodiment, (b) is the operation chain. It is the sectional view on the AA line of FIG. 3 which shows the state after engaging a 1st connection piece and a 2nd connection piece. (A) is the BB sectional drawing of FIG. 3 which shows the state before engaging the 1st connection piece and 2nd connection piece of an operation chain, (b) is the 1st connection piece of an operation chain, It is the BB sectional view taken on the line of FIG. 3 which shows the state after engaging the 2nd connection piece. It is a principal part perspective view which shows the state before engaging the 1st connection piece and the 2nd connection piece of the operation chain. It is the principal part perspective view of the operation chain which is the state after engaging the 1st connection piece and the 2nd connection piece of the operation chain, and includes a cord part and a ball part. It is principal part sectional drawing which shows the procedure which attaches the 1st or 2nd connection piece to the edge part of an operation chain in the manufacturing process of an operation chain. It is principal part sectional drawing which shows the procedure which cut | disconnects and shortens an operation chain in order to shorten the length of the operation chain made into the endless ring shape, and attaches a 1st or 2nd connection piece to the edge part of an operation chain again.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1 to FIG. 4, the connecting structure of the operation chain 11 includes a single cord portion 12 formed in a string shape and a plurality of ball portions fixed at intervals in the longitudinal direction of the cord portion 12. 13 and a connecting member 20 that connects both ends of the operating chain 11 to form an endless ring. The cord portion 12 is formed of a thermoplastic resin such as polyester, and the ball portion 13 is formed of a thermoplastic resin such as polyacetal or acrylic. By forming the cord portion 12 with a thermoplastic resin such as polyester as described above, both ends of the cord portion 12 can be easily thermally deformed. The ball portion 13 is formed in a substantially spheroid shape extending in the longitudinal direction of the cord portion 12. That is, the ball portion 13 is a rotating body obtained using the major axis of the ellipse as a rotation axis, and is formed in a shape in which the major axis coincides with the axis of the cord portion 12. Further, the operation chain 11 is formed by first forming the cord portion 12, and then forming the ball portion 13 on the cord portion 12 and heat-sealing (FIGS. 1 and 2). Therefore, only the ball portion 13 of the operation chain 11 can be crushed and removed, and only the cord portion 12 can be left.

  On the other hand, the connection member 20 includes a first connection piece 21 having a base portion attached to one end of the operation chain 11 and a second connection piece 22 having a base portion attached to the other end of the operation chain 11 (FIGS. 1 to 1). 4). The first connecting piece 21 includes a first U-shaped first connecting body 21a having an arcuate outer peripheral surface, and a first part that can be loosely fitted to one end of the cord 12 formed at the base of the first connecting body 21a. It has a pair of elastically deformable first locking portions 21c and 21c formed on both the through hole 21b and the tip of the first connecting body 21a (FIGS. 1 and 2). The second connecting piece 22 is loosely fitted to the other end of the cord portion 12 formed on the base portion of the second connecting body 22a and the second connecting body 22a formed in a substantially U shape whose outer peripheral surface is formed in an arc shape. It has a possible second through hole 22b and a pair of elastically deformable second locking portions 22c and 22c formed at both ends of the second connecting body 22a. The first connecting piece 21 and the second connecting piece 22 are formed in exactly the same shape. Therefore, the first connecting piece 21 and the second connecting piece 22 are formed by a single molding die. Here, the outer peripheral surfaces of the first and second coupling bodies 21a, 22a are formed in an arc shape in a cross section cut by a plane orthogonal to the cores of the first and second through holes 21b, 22b. The outer peripheral surfaces of the first and second connection main bodies 21a and 22a are formed in an arc shape (FIGS. 3 and 4).

  The first connecting piece 21 is formed with a pair of first locked portions 21d and 21d that can be locked by elastic deformation of the pair of second locking portions 22c and 22c, respectively. Are formed with a pair of second locked portions 22d and 22d that can be locked by elastic deformation of the pair of first locking portions 21c and 21c, respectively (FIGS. 1 to 3). The second locking portion 22c is formed in a hook shape having a predetermined width, and the first locked portion 21d is formed in a concave shape having a predetermined width and locked by the hook-shaped second locking portion 22c. (FIGS. 1 and 2). The first locking portion 21c is formed in a hook shape having a predetermined width, and the second locked portion 22d is formed in a concave shape having a predetermined width and locked by the hook-shaped first locking portion 21c. Is done. The second locking portion 22c and the first locking portion 21c are formed in the same shape, and the first locked portion 21d and the second locked portion 22d are formed in the same shape.

  On the other hand, a first retaining portion 12a is formed at one end of the cord portion 12 in which the first through hole 21b of the first connecting piece 21 is loosely fitted. The first retaining portion 12a is formed by the first connecting piece 21 being a cord. It has a function of preventing separation from one end of the portion 12 (FIGS. 1 and 2). Further, a second retaining portion 12b is formed at the other end of the cord portion 12 in which the second through hole 22b of the second connecting piece 22 is loosely fitted. The second retaining portion 12b is formed by the second connecting piece 22 being a cord. It has a function of preventing separation from the other end of the portion 12. In this embodiment, since the cord portion 12 is formed of a thermoplastic resin as described above, the first retaining portion 12a is formed to have a larger diameter than the cord portion 12 by thermally deforming one end of the cord portion 12. The second retaining portion 12b is a second flange portion that is formed with a larger diameter than the cord portion 12 by thermally deforming the other end of the cord portion 12.

  In the connection structure of the operation chain 11 configured as described above, the first and second connection pieces 21 and 22 are formed in the same shape, and the connection pieces 21 and 22 are combined to be substantially the same as the ball portion 13. Since it is configured to have an outer shape, the first and second connecting pieces 21 and 22 can be manufactured with a single molding die, the number of processing steps by the die can be reduced, and the number of parts can be reduced. If the pair of second locking portions 22c, 22c of the second connecting piece 22 are elastically deformed and locked to the pair of first locked portions 21d, 21d of the first connecting piece 21, the second inevitably becomes the second. Since the pair of first locking portions 21c, 21c of the first connecting piece 21 are elastically deformed and locked to the pair of second locked portions 22d, 22d of the connecting piece 22, the ball portion 13 can be substantially simplified. The 1st and 2nd connection pieces 21 and 22 can be united so that it may become the same external shape.

  Next, the connection method in the manufacturing process of the operation chain 11 is demonstrated based on FIG. First, an operation chain 11 manufactured with a predetermined length is prepared. Next, the ball portion 13 at one end of the cord portion 12 is crushed and removed, and the cord portion 12 is cut at a position substantially at the center of the removed ball portion 13 (FIG. 5A). Next, the first through hole 21b of the first connecting piece 21 is loosely fitted to one end of the cord portion 12 of the operation chain 11 (FIG. 5B). Further, one end of the cord portion 12 protruding from the first through hole 21b is thermally deformed to form a first flange portion 12a (first retaining portion) having a large diameter of the cord portion 12 (FIG. 5C). . Thereby, the 1st connection piece 21 does not come off from the cord part 12 (FIG.5 (d)). At this time, the interval between the first connecting piece 21 and the ball portion 13 adjacent to the first connecting piece 21 is substantially the same as the interval between the other adjacent ball portions 13. Similarly to the above, the ball portion 13 at the other end of the cord portion 12 is crushed and removed, and the cord portion 12 is cut at a position that is approximately the center of the removed ball portion 13 (FIG. 5A). The second through hole 22b of the second connecting piece 22 is loosely fitted to the other end of the cord portion 12 of the operation chain 11 (FIG. 5 (b)), and the other end of the cord portion 12 protruding from the second through hole 22b is further inserted. The second flange portion 12b (second retaining portion) having a large diameter is formed by thermal deformation (FIG. 5C). As a result, the second connecting piece 22 does not come out of the cord portion 12 (FIG. 5D). At this time, the interval between the second connecting piece 22 and the ball portion 13 adjacent to the second connecting piece 22 is substantially the same as the interval between the other adjacent ball portions 13. Then, the tips of the first and second connecting pieces 21 and 22 are opposed to each other, and either one of the first or second connecting pieces 21 and 22 is rotated 90 degrees around the axis of the cord portion 12, The first locking portion 21d is elastically deformed and locked with the second locking portion 22c, and the first locking portion 21c is elastically deformed and locked with the second locked portion 22d. And the 2nd connection pieces 21 and 22 are engaged and united (FIGS. 1-4). As a result, the operation chain 11 can be formed into an endless ring shape, and the outer shapes of the first and second connecting pieces 21 and 22 are substantially the same as the outer shape of the ball portion 13.

  Next, a procedure for shortening the overall length of the endless operation chain 11 will be described with reference to FIG. First, the first and second connecting pieces 21 and 22 are disengaged, and one of the first or second retaining portions 12a and 12b is cut from the cord portion 12 to cut the first or second connecting piece 21. , 22 is removed. In this embodiment, an example in which the first connecting piece 21 is removed from one end of the cord portion 12 is shown. Next, the ball portion on one end side of the cord portion is crushed and removed so that the entire length of the operation chain 11 becomes a desired length, and then the cord portion is cut. Specifically, the ball portion 13 existing at a position where the entire length of the operation chain 11 becomes a desired length is crushed and removed (FIGS. 6A and 6B), and the substantially center of the removed ball portion 13 is removed. The cord portion 12 is cut at the position (FIG. 6C). Next, the first through hole 21b of the removed first connecting piece 21 is loosely fitted to one end of the cord portion 12 (FIG. 6D). Furthermore, one end of the cord portion 12 protruding from the first through hole 21b is thermally deformed to form a first flange portion 12a (first retaining portion) having a large diameter of the cord portion 12 (FIG. 6E). . Thereby, the 1st connection piece 21 does not come off from the cord part 12 (FIG.6 (f)). At this time, the interval between the first connecting piece 21 and the ball portion 13 adjacent to the first connecting piece 21 is substantially the same as the interval between the other adjacent ball portions 13. Then, the tips of the first and second connecting pieces 21 and 22 are opposed to each other, and either one of the first or second connecting pieces 21 and 22 is rotated 90 degrees around the axis of the cord portion 12, The first locking portion 21d is elastically deformed and locked with the second locking portion 22c, and the first locking portion 21c is elastically deformed and locked with the second locked portion 22d. And the 2nd connection pieces 21 and 22 are engaged and united (FIGS. 1-4). As a result, the first and second connecting pieces 21 and 22 are engaged to make the operation chain 11 an endless ring again. Thus, even after the first and second connecting pieces 21 and 22 are engaged to form an endless ring, the length of the operation chain 11 can be relatively easily reduced by a simple operation. it can.

  In the above embodiment, the ball portion is formed in a substantially spheroid shape, and the combination of the first and second connecting pieces is configured to have the same outer shape as the ball portion. The combination of the first and second connecting pieces may be configured to have the same outer shape as the ball portion. Moreover, in the said embodiment, the 1st flange part formed in the diameter larger than the code | cord | chord part by heat-deforming one end of a code | cord | chord as a 1st retaining part is mentioned, and other than a cord part as a 2nd retaining part The second flange portion formed by heat-deforming the end and having a diameter larger than that of the cord portion is mentioned. The first retaining portion is a first knot formed at one end of the cord portion, and the second retaining portion is the cord. The second knot may be a second knot formed on the other end of the portion, or the first retaining portion is a first caulking portion formed by caulking a metal plate or a metal ring on one end of the cord portion, 2 The retaining part may be a second caulking part formed by caulking a metal plate or a metal ring to the other end of the cord part.

11 Operation chain 12 Cord portion 12a First flange portion (first retaining portion)
12b Second flange part (second retaining part)
20 connecting member 21 first connecting piece 21a first connecting body 21b first through hole 21c first locking portion 21d first locked portion 22 second connecting piece 22a second connecting body 22b second through hole 22c second engagement Stop part 22d Second locked part

Claims (6)

An operation chain (11) having a single cord portion (12) formed in a string shape and a plurality of ball portions (13) fixed at intervals in the longitudinal direction of the cord portion (12), In the connection structure of the operation chain provided with a connection member (20) that connects both ends of the operation chain (11) to form an endless ring shape,
The connecting member (20) includes a first U-shaped first connecting body (21a) having an outer peripheral surface formed in an arc shape, and a base portion attached to one end of the operating chain (11). (21) and a substantially U-shaped second connection body (22a) having an outer peripheral surface formed in an arc shape, and a base is attached to the other end of the operation chain (11) and the first connection piece ( 21) and a second connecting piece (22) formed in the same shape,
The tips of the first and second connecting pieces (21, 22) are opposed to each other, and either one of the first or second connecting pieces (21, 22) is 90 around the axis of the cord portion (12). When the first and second connection pieces (21, 22) are engaged and combined with each other in a state where the first and second connection pieces (21, 22) are combined, the outer shape of the first and second connection pieces (21, 22) is (13) An operation chain coupling structure characterized by being configured to have substantially the same shape as the outer shape of (13). The first connection piece (21) is formed in a base portion of the first connection body (21a), and a first through hole (21b) that can be loosely fitted to one end of the cord portion (12); and the first connection body A pair of elastically deformable first locking portions (21c, 21c) respectively formed on both ends of (21a);
The second connecting piece (22) is formed in a base portion of the second connecting body (22a), and a second through hole (22b) that can be loosely fitted to the other end of the cord portion (12); A pair of elastically deformable second locking portions (22c, 22c) respectively formed on both ends of the body (22a);
A pair of first locked portions (21d, 21d) that can be locked by elastic deformation of the pair of second locking portions (22c, 22c) are formed on the first connecting piece (21), respectively.
A pair of second locked portions (22d, 22d) on which the pair of first locking portions (21c, 21c) can be elastically deformed and locked are formed on the second connecting piece (22), respectively. Item 1. The operation chain coupling structure according to Item 1.   The first connecting piece (21) is detached from one end of the cord portion (12) at one end of the cord portion (12) in which the first through hole (21b) of the first connecting piece (21) is loosely fitted. A first retaining portion (12a) that prevents the second connecting piece (22) from being formed, and the other end of the cord portion (12) in which the second through hole (22b) of the second connecting piece (22) is loosely fitted; The operation chain coupling structure according to claim 2, wherein a second retaining portion (12b) is formed to prevent the second coupling piece (22) from being detached from the other end of the cord portion (12).   At least the cord portion (12) of the operation chain (11) is formed of a thermoplastic resin, and the first retaining portion (12a) thermally deforms one end of the cord portion (12) so that the cord portion ( 12) a first flange portion having a larger diameter, and the second retaining portion (12b) thermally deforms the other end of the cord portion (12) so as to have a larger diameter than the cord portion (12). The operation chain coupling structure according to claim 3, which is the formed second flange portion.   The operation according to claim 3, wherein the first retaining portion is a first knot formed at one end of the cord portion, and the second retaining portion is a second knot formed at the other end of the cord portion. Chain connection structure.   The first retaining portion is a first caulking portion formed by caulking a metal plate or a metal ring to one end of the cord portion, and the second retaining portion is a metal plate or the other end of the cord portion. The operation chain coupling structure according to claim 3, which is a second caulking portion formed by caulking a metal ring.

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