JPH0728410Y2 - Universal Sardin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a universal joint for connecting a plurality of blinds attached to a bay window or the like in an interlocking manner.

(Prior Art) Conventionally, when a plurality of blinds are attached to an upper frame of a window in accordance with a bay window provided in a house, slats provided in those head boxes for interlocking operation of each blind. A drive shaft connected by a universal joint has been put into practical use. As an example of such a universal joint, a blind head box is flexibly connected by a hinge joint, and a flexible cable inserted in the hinge joint connects the slat drive shafts in each head box to transmit rotational torque. There is something.

(Problems to be solved by the invention) However, in such a universal joint, when the headbox is bent and stretched, the required length of the flexible cable between the headboxes is different. That is, it is necessary to lengthen the flexible cable as the bending angle of both headboxes is increased. Therefore,
If the length of the flexible cable does not match the bending angle of the head box, the cable may become loose in the hinge joint or the head box, or may become too tight, which may hinder the driving operation of the slats. It was Further, it is extremely complicated to adjust the length of the flexible cable according to the bending angle of the head box at the blind installation site.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention connects a pair of hinge cases in a bendable manner and rotatably supports a pair of connecting shafts in each hinge case. In a universal joint in which the connecting shafts are connected by a flexible cable so that torque can be transmitted, inside the hinge cases 2 and 3 with the pair of connecting shafts 4 and 5 linear and bent at a specific angle. The rotation center X of the hinge cases 2 and 3 is arranged so as to be displaced in a direction perpendicular to the extension line C of the axis of the connecting shaft so that the length of the flexible cable 6 located at is not changed.

(Operation) By the above means, the required length of the flexible cable 6 between the connecting shafts 4 and 5 is constant when the connecting shafts 4 and 5 are linear and when they are bent at a specific angle. .

(Embodiment) Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In a universal joint 1, first and second hinge cases 2 and 3 are rotatably connected, and the hinge cases 2 and 3 are connected. The connection shafts 4 and 5 are rotatably supported by the support cylinders 2a and 3a, and both ends of the flexible cable 6 are fitted to the connection shafts 4 and 5 as shown in FIG. Both connecting shafts 4 and 5 rotate together. A box cap 7 is fitted to the support cylinders 2a and 3a of the hinge cases 2 and 3, and the head box 8 is attached to the box cap 7.
Are fitted and supported. Further, particularly, the support cylinder 2a of the first hinge case 2 is provided with the fitting projection 9, and the fitting cap 9 is fitted with the box cap 7.

A slat drive shaft 10 supported in each head box 8 is fitted to the base end of each connecting shaft 4,5, and the rotation of one slat drive shaft 10 is performed via the connecting shafts 4,5 and the flexible cable 6. Is transmitted to the other slat drive shaft 10.

As shown in FIG. 3, the first hinge case 2 has a pair of first hinge pieces 11 projecting horizontally from both upper and lower sides, and the tip of the hinge pieces 11 is formed in a circular shape, and the circular portion is formed. A circular rotation hole 12 is formed at the center of the. The center X of the turning hole 12 is located at a distance L1 from the axis extension line C of the connecting shaft 4.

The second hinge case 3 is provided with a pair of second hinge pieces 13 that horizontally project inward of the first hinge piece 15, and the tip end portion of the hinge piece 13 is formed into a circular shape. At the center of the circular portion, there is provided a rotation protrusion 14 which can be rotatably fitted in the rotation hole 12. The center of the rotation protrusion 14 is also located at a distance L1 from the axis extension line C of the connecting shaft 5, and the rotation protrusion is inserted into the rotation hole 12.
14 is inserted and the first and second hinge cases 2 and 3 are first
It is possible to rotate in the range of 90 degrees from the state shown by the solid line to the state shown by the chain line.

A hinge cover 15 is arranged between the second hinge pieces 13. As shown in FIG. 4, the hinge cover 15 is formed with a first projection 16 having an apex angle of 90 degrees, which is formed by projecting both side portions of a covered cylindrical body having a downward opening in the tangential direction of the cylindrical body. Both left and right sides are opened in the half part, and a front piece 18 and a rear piece 19 are formed in front of and behind the opening. Further, a second protrusion 20 is formed in front of the first protrusion 16.

The hinge cover 15 thus formed is arranged in the hinge cases 2 and 3 as shown in FIG.
The flexible cable 6 is inserted between the rear piece 8 and the rear piece 19, and the front side edge 21 and the rear side edge 22 of the first and second hinge cases 2 and 3 are slidably brought into contact with the outer peripheral surface of the hinge cover 15. The hinge cover 15 is positioned.

Then, as shown in FIG. 2, when the connecting shafts 4 and 5 are linearly positioned, the rear edges 22 of the hinge cases 2 and 3 come into contact with each other, and the front of the hinge cover 15 is placed in the gap between the front edges 21. The piece 18 is located, and as shown in FIG.
When is rotated, the front side edge 21 abuts and the rear piece 19 is positioned in the gap between the rear side edges 22. Further, the inner surface of the front side edge 21 abuts on the second protrusion 20 when the hinge cases 2 and 3 shown in FIGS.
Alternatively, the inner surface of the rear side edge 22 comes into contact with the first protrusion 16 to prevent further rotation, and the relative position of the hinge cover 15 with respect to the hinge cases 2 and 3 is restricted.

Now, the universal joint 1 configured in this way
The rotation of one slat drive shaft is transmitted to the other slat drive shaft via the connecting shafts 4 and 5 and the flexible cable 6. Then, when both hinge cases 2 and 3 are rotated 90 degrees from the state shown in FIG. 2 to the state shown in FIG. 5, the flexible cable 6 is bent from the straight state into a quarter arc shape. At this time, if the length of the flexible cable 6 in the hinge cases 2 and 3 is the same between the straight line state shown in FIG. 2 and the quarter arc shape shown in FIG. 5, in the straight line state and the quarter arc state, The cable 6 does not come in and out of the head box 8. Therefore, the condition is 2πR / 4 = 2L2, where 2L2 is the length of the flexible cable 6 that is linear in the hinge cases 2 and 3 and R is the radius of the flexible cable 6 that is in the shape of a quarter arc. Therefore, R = (4 / π) L2. That is, R may be (4 / π) times the length of L2. Therefore, in this embodiment, the above condition is satisfied by shifting the rotation center X of both hinge cases 2 and 3 from the axial extension line C of the connecting shafts 4 and 5 by a distance L1. As a result, the flexible cable 6 does not move with respect to the head box 8 when the connecting shafts 4 and 5 are in a straight line shape and in a state in which the connecting shafts are in a quadrangular arc shape. In addition, the flexible cable 6 between the connecting shafts 4 and 5 is slightly strained from the state where the connecting shafts 4 and 5 are linear to the state where the connecting shafts 4 and 5 are arcuate, but the extent is slight. Therefore, if the flexible cable 6 has a slight margin in a state where the connecting shafts 4 and 5 are in the shape of a straight line and a quarter arc, it is possible to prevent the trouble caused by the tension of the cable 6.

In addition, in this universal joint 1, since the front and rear pieces 18 and 19 of the hinge cover 15 hide the inside of the hinge cases 2 and 3 in any state, the flexible cable 6 is not exposed and is aesthetically superior.

Effect of the Invention As described above in detail, even if the hinge case is rotated, the change in the required length of the flexible cable 6 between the connecting shafts 4 and 5 is small, so that the cable 6 is used in the hinge case 2. It is possible to prevent the drive operation from being hindered due to excessive slackness or excessive tension within 3 and 3, and to adapt the flexible cable 6 according to the bending angle of the universal joint 1 at the installation site. It has an excellent effect without the need to adjust the length.

[Brief description of drawings]

1 is a plan view of a universal joint embodying the present invention, FIG. 2 is a transverse sectional view of the same, FIG. 3 is a vertical sectional view of the same, FIG. 4 is a perspective view of a hinge cover, and FIG.
The figure is a cross-sectional view showing a state in which the hinge case is bent. The universal joint 1, the first hinge case 2, the second hinge case 3, the connecting shafts 4, 5, the flexible cable 6, the hinge cover 15, the axis extension line C, and the rotation center X.

Claims (2)

[Scope of utility model registration request] 1. A universal joint in which a pair of hinge cases are connected in a bendable manner, a pair of connection shafts are rotatably supported in each hinge case, and each connection shaft is connected by a flexible cable so as to transmit a rotational force. , A case where the pair of connecting shafts (4,5) are linear and a state where the pair of connecting shafts (4,5) form a specific angle by bending the hinge case (2, 3). The rotation center (X) of the hinge case (2,3) is perpendicular to the axis extension line (C) of the connecting shaft so that the length of the flexible cable (6) located in (2,3) does not change. A universal joint characterized by being displaced in the direction. 2. A utility model registration claim according to claim 1, wherein a hinge cover (15) for covering a gap between the hinge cases is provided in the pair of hinge cases (2, 3). Universal joint.