JPH0215068Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a ball chain connector.

Prior Art As shown in Japanese Utility Model Publication No. 36-24203, a circular notch is provided on the front and rear surfaces of a spherical lower half, and a pair of fingernail-shaped walls are erected from both sides of the spherical lower half. The connecting rod of the ball chain is fitted into the circular notch, the ball-shaped link bulging head is brought into contact with the inner surface of the spherical lower half, and in this state, the fingernail-like wall is curved and squeezed to close the ball chain. There are known connectors for connecting.

Problems that the invention aims to solve When using a ball chain as a string for operating blinds installed in the window of a building, for example, the ball chain is wrapped around a pulley, so if the coupling device is large, it may get caught on the pulley. Therefore, it is desirable that the connecting tool be small, and in order to prevent the ball chain from coming out of the connecting tool even if a large tension is applied to the ball chain, the connecting tool should be strong and firmly connect the ball chain. It is desirable that it can be maintained.

However, in the case of the above-mentioned coupling device, a pair of ball-shaped link bulging heads are inserted into the spherical lower half, so the link is larger as a whole compared to the ball-shaped link bulging head, and the above-mentioned coupling device Because the bulging head of the ball chain link is included, it cannot be used to connect the ends of a ball chain where balls are injection molded and attached to a flexible string with a certain pinch. It is.

In addition, since the structure is such that the fingernail-like wall is curved and connected and held to the ball-shaped bulging head of the link of the ball chain, it cannot be made of synthetic resin and must be made of metal. If the balls are connected to a synthetic resin ball chain made of synthetic resin, the connecting strings and balls are likely to be damaged.

Means and operation for solving the problem The upper and lower walls and both end walls form a substantially flat ring shape, and a ball insertion hole is formed in the center of the upper wall, and the ball insertion hole is continuous with the upper wall and both end walls. Furthermore, reinforcing ridges are formed in the upper wall on both sides of the ball insertion hole, so that the ball and the connecting string can be inserted through the ball insertion hole and the slit, and the reinforcing ridges allow the upper wall to be inserted through the ball insertion hole and the slit. This is to maintain the strength of the wall.

Embodiment FIG. 4 is a front view of a ball chain, in which a large number of balls 2 are injection molded and attached at regular intervals to a connecting cord 3 made of a knitted cord or a twisted cord.

The ball 2 is made of synthetic resin such as acetal resin.

As shown in FIG. 5, the ball chain 1 is made endless or long by connecting the balls 2, 2 at both ends with a connector 10.

As shown in FIG. 1, the connector 10 is made of synthetic resin and has approximately rectangular upper and lower walls having a predetermined width, length, and thickness, and whose width gradually becomes narrower from the center in the longitudinal direction toward both ends. 11, 12, and both end walls 13, 13 made of synthetic resin and curved into a substantially semicircular shape and having the same width as both ends of the upper and lower walls 11, 12 form a narrow, elongated and flat substantially ring shape, In the center of the upper wall 11, there is formed a ball insertion hole 14 which is approximately elliptical and has the same shape as the ball 2, and a slit 1 which is continuous with the ball insertion hole 14.
5 is formed across the upper wall 11 and both end walls 13,
Reinforcing protuberances 16 are integrally formed in portions of the upper wall 11 located on both sides of the ball insertion hole 14 and are thick.

The width of the slit 15 is slightly narrower than the diameter of the connecting string 3, and the dimension between the two end walls 13, 13 is slightly smaller than three times the longitudinal length of the ball 2, and the width of the upper and lower walls 11, 12 The width of the ball 2 is slightly larger than the length of the ball 2 in the short axis direction.

As shown in FIGS. 2 and 3, the connecting string 3 of the pair of balls 2 fits into the slit 15, and the balls 2 contact the inner surface of the end wall 13 and are connected. It is narrowed down to a small diameter to prevent it from coming off.

Note that when the ball 2 at one end is inserted through the ball insertion hole 14 and then the ball 2 at the other end is inserted, it will interfere with the ball 2 inserted first, but the connector 10 is in the form of a flat link and both sides are Since the opening is open, the ball 2 inserted first can be smoothly inserted while pushing the ball 2 inserted later outward from the opening.

[Effect of idea]

By inserting the ball 2 through the ball insertion hole 14 of the upper wall 11 and fitting the connecting string 3 into the slit 15, the ends of the ball chain 1 can be connected. Since the balls 2 are formed across the ball chain 1, the balls 2 at one end of the ball chain 1 can be connected to the balls 2 at the other end.

In addition, it has a substantially flat ring shape with openings on both sides, and the dimension between both end walls 13, 13 is slightly smaller than three times the length of the ball 2 in the long axis direction, so the ball 2 at one end is inserted into the ball. When inserting the ball 2 at the other end after inserting it from the hole 14, it will interfere with the ball 2 inserted first, but the ball 2 inserted first will be pushed outward from the opening by the ball 2 inserted later. The balls 2 can be inserted smoothly, and the two balls 2 can be smoothly connected without making the dimension between the end walls 13, 13 larger than three times the length of the balls 2 in the longitudinal direction. Since the reinforcing protrusions 16 are integrally formed in the parts located on both sides of the insertion hole 14, the strength can be maintained without increasing the width of the upper wall 11 by reinforcing the part where the ball insertion hole 14 is formed. Since the other end sides of the upper wall 11 are made thinner, the dimension between the inner surfaces of the upper and lower walls 11 and 12 can be increased, so the ball can be supported without increasing the height between the upper and lower walls 11 and 12, and the height can be reduced. .

Therefore, the above-mentioned factors combine to make it small and
Moreover, it becomes a connector that maintains sufficient strength.

Further, the dimension between the two end walls 13, 13 is slightly shorter than three times the length in the longitudinal direction of the ball 2, and the upper and lower walls 11,
Since the width of ball 12 is slightly larger than the length of ball 2 in the short axis direction, when one ball 2 is pushed toward the other ball 2 by an external force, it interferes with the other ball 2 and moves to ball insertion hole 14. However, since the ball 2 interferes with the upper and lower walls 11 and 12, the ball 2 does not come out of the ball insertion hole 14.
The ball 2 will not come off by mistake without providing any special member.

Further, the ball chain can be connected by fitting and locking the end portion of the ball chain including the end ball into the connecting tool through the ball insertion hole 14 and the slit 15.
Since there is no need to perform swaging, connecting tool 1 is used.
0 can be made of synthetic resin, so it can also be used as a connector for a ball chain made of synthetic resin.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the connector, FIGS. 2 and 3 are plan views of the connected state,
A vertical sectional view, FIG. 4 is a front view of the ball chain, and FIG. 5 is a perspective view of the ball chain connected in an endless manner. 10 is a connector, 11 is an upper wall, 12 is a lower wall, 13
is an end wall, 14 is a ball insertion hole, 15 is a slit,
16 is a reinforcing ridge.

Claims (1)

[Claims for Utility Model Registration] In a connecting device for connecting a ball chain 1 formed by connecting a large number of balls 2 in the shape of an oblate sphere having a long axis and a short axis in the long axis direction with connecting strings 3 at intervals. The upper and lower walls 11, 12 and both end walls 13, 13 form a substantially flat ring shape with openings on both sides, and a ball insertion hole 14, which is slightly larger than the ball 2, is formed in the center of the upper wall 11. A slit 15 that is continuous with the ball insertion hole 14 is formed across the upper wall 11 and both end walls 13, 13, and reinforcing raised portions 16 are integrally formed in the portions of the upper wall 11 located on both sides of the ball insertion hole 14. , said both end walls 13,
13 is slightly smaller than three times the longitudinal length of ball 2, and the width of the upper and lower walls 11 and 12 is set to the width of ball 2.
A ball chain coupling device characterized in that the length in the short axis direction is slightly larger than that of the ball chain.