JP2011006928A - Ball chain and cord of horizontal blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball chain which has a connecting portion equipped with a fail-safe function, and which makes the connecting portion easily assemblable.SOLUTION: In the ball chain of a solar shading device, synthetic resin balls are molded and fixed at regular intervals on a cord; and both ends of the cord are connected together via the connecting portion, so as to bring about an endless state. The connecting portion 16 comprises a first connecting member 17 which is equipped with a fitting hole, and a second connecting member 18 which is equipped with a fitting protrusion 23 capable of being fitted into the fitting hole. The first and second connecting members 17 and 18 are molded from a synthetic resin. The fitting hole enables the fitting protrusion to be inserted in a direction orthogonal to the axial center of the cord and elastically held in the axial direction of the cord.

Description

  The present invention relates to a ball chain used as an operation code for a solar shading device such as a horizontal blind, a vertical blind, and a roll screen.

  As one type of horizontal blind, an endless ball chain is hung on a pulley that is rotatably supported at one end of the head box, and the pulley is rotated by operating the ball chain to move the slat up and down. There is one that can adjust the angle.

  The ball chain is formed by, for example, molding synthetic resin balls at equal intervals on a cord formed of a synthetic resin in a string shape. The balls can be sequentially engaged with recesses formed on the peripheral surface of the pulley so that the pulley can be driven to rotate.

  Such a ball chain is generally configured to be endless by connecting both ends of a cord formed by attaching a large number of balls with a connector. Also, in the case of a horizontal blind that moves the ball chain around the pulley one or more times to move the slats up and down, the ball shape and ball spacing of the ball chain joint are the same as the ball shape and ball spacing of other parts. It is necessary to.

  In such a case, it has been proposed to divide the ball of the joint part into two parts and fit the divided parts to each other to form a ball. (See Patent Document 1)

JP 2003-184456 A

When the endless ball chain is suspended from the pulley as described above, the endless edge of the ball chain may be caught by a resident moving in the room or other moving objects.
Therefore, when an excessive tensile force is applied to the ball chain that exceeds the tensile force acting during normal operation, the ball chain is cut by the tensile force to ensure the safety of the occupant, and It is necessary to provide a fail-safe function for preventing damage to a pulley or the like on which a ball chain is mounted.

  An object of the present invention is to provide a ball chain that has a fail-safe function in a connecting portion and that can be easily assembled.

  In claim 1, in the ball chain of the solar shading device in which synthetic resin balls are molded and fixed on the cord at equal intervals, and both ends of the cord are connected by a connecting portion, the connecting portion includes: A first connecting member provided with a fitting hole, and a second connecting member provided with a fitting protrusion capable of fitting into the fitting hole, wherein the first and second connecting members are Molded with synthetic resin, the fitting hole allows the fitting protrusion to be inserted in a direction orthogonal to the axis of the cord and elastically held in the direction of the axis of the cord.

  According to a second aspect of the present invention, the fitting protrusion has an axial shape, the fitting hole has a diameter that allows the fitting protrusion to be inserted, and the fitting protrusion can be extracted in the axial direction of the cord. The width of the opening groove is made narrower than the diameter of the fitting protrusion.

According to a third aspect of the present invention, the outer shape and interval of the first and second connecting members fitting the fitting protrusion into the fitting hole are the same as the outer shape and interval of the ball.
According to a fourth aspect of the present invention, the first connecting member is molded at both ends of the cord, the pair of fitting protrusions are provided on the second connecting member, and the first connecting member is connected to the second connecting member. Connected with members.

In Claim 5, said 1st connection member was shape | molded in the one end part of said code | cord, said 2nd connection member was shape | molded in the other end part of said code | cord, and said 1st and 2nd connection member was connected. .
According to claim 6, in the cord of the horizontal blind that is suspended from the head box and whose lower end is connected to the bottom rail, a coupling portion is interposed in the middle portion of the cord, and the coupling portion includes a fitting hole. A first connecting member and a second connecting member provided with a fitting protrusion capable of being fitted into the fitting hole, molding the first and second connecting members with a synthetic resin, The fitting hole allows the fitting protrusion to be inserted in a direction perpendicular to the axis of the cord, and the fitting is performed by a force exceeding a tensile force acting in the axis direction of the cord during normal operation. Protrusions can be separated.

  ADVANTAGE OF THE INVENTION According to this invention, the ball chain which provided the fail safe function in the connection part and was able to assemble a connection part easily can be provided.

It is a front view which shows the horizontal blind of one Embodiment. It is a front view which shows a ball chain. It is a disassembled perspective view which shows the connection part of 1st embodiment. It is a front view which shows the 2nd connection member of 1st embodiment. It is a side view which shows the 2nd connection member of 1st embodiment. It is a front view which shows the 1st connection member of 1st embodiment. It is a side view which shows the 1st connection member of 1st embodiment. It is the GG sectional view taken on the line in FIG. It is the HH sectional view taken on the line in FIG. It is sectional drawing which shows the fitting state of a connection member. It is a disassembled perspective view which shows the connection part of 2nd embodiment. It is sectional drawing which shows the fitting state of the connection member of 2nd embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The horizontal blind (sunlight shielding device) shown in FIG. 1 has a multi-stage slat 3 supported on a ladder tape 2 suspended from a head box 1 and a bottom rail 4 attached to the lower end of the ladder tape 2. Yes.

  An elevating cord 5 is inserted into the slat 3 in the vicinity of the support position of the ladder tape 2, and the bottom rail 4 is suspended and supported at the lower end of the elevating cord 5. An upper end of the lifting / lowering cord 5 is wound around a winding shaft 7 rotatably supported by a support member 6 disposed in the head box 1.

  A pulley 8 is rotatably supported at one end of the head box 1, and an endless ball chain 9 is hooked on the pulley 8. When the ball chain 9 is operated to rotate the pulley 8 in the forward / reverse direction, the winding shaft 7 is rotated via the gear box 10 and the lifting shaft 12a, and the lifting cord 5 is wound around the winding shaft 7. The slat 3 and the bottom rail 4 are moved up and down by being taken up or rewound.

  When the pulley 8 is rotated, the tilt drum 13 is rotated via the gear box 10, the tilt unit 11, the tilt shaft 12 b and the like, and each slat 3 is rotated via the ladder tape 2. ing.

  Next, a specific configuration of the ball chain 9 will be described with reference to FIGS. As shown in FIG. 2, the ball chain 9 has synthetic resin balls 15 formed at equal intervals on a polyester cord 14. Each ball 15 is formed by forming a long spherical solid body on the surface of the cord 14 with a molding machine, and each ball 15 is fixed to the cord 14 so as not to move.

  Both end portions of the cord 14 are connected by a connecting portion 16 to form an endless ball chain 9. As shown in FIG. 3, the connecting portion 16 has a configuration in which two first connecting members 17 having the same configuration are connected by a second connecting member 18.

  In the first connecting member 17, a hemispherical portion 20 having a half shape of the ball 15 is outsert-molded at one end of a connecting cord 19 made of the same material as the cord 14, and a first fitting portion 21 is formed at the other end. Is formed. The interval between the first fitting portion 21 and the hemispherical portion 20 is the same as the interval between the balls 15.

  The first fitting portion 21 is a ball having the same shape as the ball 15 provided with a fitting recess 22, and the second connecting member 18 can be fitted into the fitting recess 22. In this configuration, the mating protrusions 23 are provided at both ends of the shaft portion 24.

  The second connecting member 18 is integrally formed of synthetic resin, and as shown in FIGS. 4 and 5, round shaft-shaped fitting protrusions 23 are formed in line symmetry on both ends of the shaft portion 24, The central axis of the round shaft and the central axis of the shaft portion 24 are formed so as to be orthogonal to each other.

  As shown in FIGS. 6 to 9, the fitting recess 22 is formed with a fitting hole 25 in a direction perpendicular to the central axis of the connecting cord 19, and the fitting hole 25 defines the fitting protrusion 23. It has a diameter that can be easily inserted.

  The fitting hole 25 is opened toward the opposite side of the connecting cord 19 with an opening groove 26 having a narrower groove width than the diameter of the fitting hole 25, and the opening groove 26 has the second connecting member 18. An insertion hole 27 through which the shaft portion 24 can be inserted is formed.

  As shown in FIG. 3, the first and second connecting members 17, 18 configured in this way are fitted into the fitting holes 25 of the first connecting member 17. When the portion 23 is inserted in a direction orthogonal to the connecting cord 19, the first connecting member 17 is connected by the second connecting member 18.

  In this state, the round shaft-like fitting protrusion 23 is held in the fitting hole 25, and the holding force is a normal tensile force acting on the ball chain 9 during a normal slat raising / lowering operation and a slat angle adjusting operation. The mating protrusion 23 is set so as not to be detached from the fitting hole 25. Only when a large pulling force exceeding the normal pulling force is applied to the ball chain 9, the opening groove 26 is pushed and expanded by the fitting protrusion 23 by the elasticity of the synthetic resin of the first connecting member 17. The mating protrusion 23 is configured to be detached from the fitting hole 25.

Further, the outer shape in a state where the fitting protrusion 23 is fitted to the first fitting portion 21 is formed to be substantially the same shape as the ball 15.
The hemispherical portion 20 of the first connecting member 17 is welded and fixed to a hemispherical portion 15 a that is outsert-molded at both ends of the cord 14 to form a ball having the same shape as the ball 15. When the first connecting member 17 is connected by the second connecting member 18, an endless ball chain 9 is formed.

In the ball chain 9 of this embodiment, the following operational effects can be obtained.
(1) Balls of the same shape are formed at the same interval over the entire length of the cord 14 of the ball chain 9, the connecting cord 19 of the connecting portion 16, and the shaft portion 24. Therefore, the ball chain 9 can be rotated around the pulley 8 without limitation, and the slat can be lifted and lowered.
(2) When a large tensile force exceeding the normal tensile force is applied to the ball chain 9, the fitting protrusion 23 and the fitting hole 25 of the connecting portion 16 are disengaged. Therefore, when the endless edge of the ball chain 9 is caught by a resident or other moving object moving in the room, the ball chain 9 is cut to ensure the safety of the resident and the pulley on which the ball chain 9 is hung. A fail-safe function for preventing damage such as 8 can be provided.
(3) After the fitting protrusion 23 of the connecting portion 16 and the fitting hole 25 are disengaged, the fitting protrusion 23 is re-fitted into the fitting hole 25 to form an endless ball chain 9. Can be easily reproduced.
(4) Since the fitting protrusion 23 is inserted into the fitting recess 22 of the first connecting member 17 in a direction orthogonal to the extending direction of the connecting cord 19, the fitting protrusion 23 is fitted. 23 can be fitted to the first connecting member 17 with a slight operating force, and a holding force for holding the fitting projection 23 on the first connecting member 17 can be sufficiently secured.
(5) When fitting the fitting protrusion 23 into the fitting hole 25, a tool or the like is not required. Therefore, the assembling work of the ball chain 9 and the work of re-fitting the fitting protrusion 23 into the fitting hole 25 can be easily performed.
(Second embodiment)
FIG. 11 shows a second embodiment of the connecting portion 16. In this embodiment, the first fitting portion 21 is molded as a first connecting member at one end of the cord 14, and the fitting protrusion 23 is formed at the other end of the cord 14 as a second connecting member. The connecting portion 16 is configured by molding as follows.

  With such a configuration, as in the first embodiment, when the fitting protrusion 23 is fitted into the fitting hole 25 of the first fitting portion 21, the end portion of the cord 14 becomes the first and second ends. The endless ball chain 9 is formed by the connection member.

  When the fitting protrusion 23 is fitted into the fitting hole 25 of the first fitting portion 21, the outer shape of the connecting portion 16 is the same as that of the other balls 15 as shown in FIG. 12. In addition, the first fitting portion 21 and the fitting protrusion 23 are arranged such that the interval between the connecting portion 16 formed by fitting them and the adjacent ball 15 is the same as the interval between the other balls 15. Molded at the end of the cord 14.

In the ball chain 9 of this embodiment, in addition to the functions and effects obtained in the first embodiment, the following functions and effects can be obtained.
(1) A first fitting portion 21 is molded as a first connecting member at one end of the cord 14, and a fitting projection 23 is molded as a second connecting member at the other end of the cord 14. By fitting the fitting protrusion 23 into the fitting portion 21, the endless ball chain 9 can be formed.
(2) Since the second connecting member 18 of the first embodiment is not required, the number of parts can be reduced and the manufacturing cost can be reduced.

You may implement the said embodiment in the following aspects.
-In 1st embodiment, the 2nd connection member 18 may shape | mold the fitting protrusion 23 on the both ends of the code | cord | chord of the same material as the said code | cord | chord 14. FIG.
-In 1st embodiment, the 2nd connection member 18 may integrally mold the fitting protrusion 23 and the axial part 24 with the synthetic resin from which hardness differs. In this case, the fitting protrusion 23 is made of a hard synthetic resin, and the shaft portion 24 is made of a soft synthetic resin.
The fitting protrusion 23 may be a shaft having a polygonal cross section in addition to a round shaft.
-The joint surface of the hemispherical part 15a and the hemispherical part 20 may be inclined with respect to the axial center of the hemispherical part 15a and the hemispherical part 20 to increase the area of the joint surface.
The connecting portion 16 may be provided at an intermediate portion of the lifting / lowering cord or the operation cord that is suspended from the head box of the horizontal blind and connected to the bottom rail so as to have a fail-safe function. In this case, the connecting cord 19 of the first connecting member 17 of the first embodiment is sewn to the end of the lifting / lowering cord or the operation cord, and the first connecting member 17 is connected by the second connecting member 18. To do. Alternatively, the cord 14 of the second embodiment is sewn to the end of the lifting / lowering cord or the operation cord, and the fitting projection 23 is fitted to the first fitting portion 21.

  DESCRIPTION OF SYMBOLS 9 ... Ball chain, 14 ... Cord, 15 ... Ball, 16 ... Connection part, 17 ... 1st connection member, 18 ... 2nd connection member, 23 ... Fitting protrusion, 25 ... Fitting hole.

Claims (6)

In the ball chain of the solar shading device that is formed by fixing synthetic resin balls on the cord at equal intervals, and connecting the both ends of the cord with connecting portions to make them endless,
The connecting portion is
A first connecting member having a fitting hole;
A second connecting member provided with a fitting protrusion capable of fitting into the fitting hole;
Molding the first and second connecting members with synthetic resin;
The fitting hole allows the fitting protrusion to be inserted in a direction perpendicular to the axis of the cord, and the fitting hole is operated by a force exceeding a tensile force acting in the axis direction of the cord during normal operation. A ball chain characterized in that the mating protrusion can be separated. The fitting protrusion is a shaft,
The fitting hole has a diameter that allows the fitting protrusion to be inserted, and has an opening groove that allows the fitting protrusion to be extracted in the axial direction of the cord, and the width of the opening groove is fitted. The ball chain according to claim 1, wherein the ball chain is narrower than a diameter of the mating protrusion.   3. The outer shape and interval of the first and second connecting members fitting the fitting protrusion into the fitting hole are the same as the outer shape and interval of the ball. The listed ball chain.   The first connecting members are respectively molded at both ends of the cord, a pair of fitting protrusions are provided on the second connecting member, and the first connecting member is connected by the second connecting member. The ball chain according to any one of claims 1 to 3, wherein:   The first connecting member is molded at one end of the cord, the second connecting member is molded at the other end of the cord, and the first and second connecting members are connected. The ball chain according to any one of claims 1 to 3. In the cord of the horizontal blind that hangs down from the head box and the lower end is connected to the bottom rail,
Interposing a connecting part in the middle part of the cord,
The connecting portion is
A first connecting member having a fitting hole;
A second connecting member provided with a fitting protrusion capable of fitting into the fitting hole;
Molding the first and second connecting members with synthetic resin;
The fitting hole allows the fitting protrusion to be inserted in a direction perpendicular to the axis of the cord, and the fitting hole is operated by a force exceeding a tensile force acting in the axis direction of the cord during normal operation. A horizontal blind cord characterized in that the mating protrusion can be separated.

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