JPS642942Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a blind opening/closing device with a stopper, in particular, a worm gear fitted via a clutch mechanism to a hexagonal bar installed longitudinally inside a head box to operate a ladder cord for opening/closing the blind. It has a mechanism that opens and closes the slat by rotating it with a worm fixed to the upper end of the operating shaft, and a stopper device for controlling the rotation of the hexagonal bar in the ladder cord drive unit housed in or in the head box. The objective is to improve a blind opening/closing device with a stopper that is not only reliable in operation, but also has a simple structure, a small number of parts, and is inexpensive and suitable for mass production. A blind opening/closing device is provided. In the present invention, in the blind opening/closing device with a stopper having the above configuration, the clutch mechanism is such that one joint has its center inserted into a hexagonal bar, and is provided with a notch that expands in the connecting direction. A prismatic convex part with a hollow part is formed of an elastic body, and the other joint has a hexagonal rod rotatably passed through the center, and a convex part formed on the one joint at the end in the connection direction. This objective was achieved by forming a wheel having a prismatic concave portion that fits externally, and providing a worm gear that meshes with the operating shaft in the uncoupled direction portion.

The present invention will be described in detail below based on an embodiment shown in the drawings.

Reference numeral 1 denotes a drive unit for rotating a hexagonal bar 5 installed in the longitudinal direction in a head box 4 in order to operate a ladder cord 3 suspended on a slat 2. The drive unit 1 is used for opening and closing the slat 2. A worm 8 and a worm gear 9 drive rotation from a flexible operating shaft 6 to a hexagonal rod 5 via a clutch mechanism 7. The clutch mechanism 7 is made up of joints 10 and 11, and one joint 10 has a shaft 101 at its left end that is rotatably supported in a through hole 122 drilled in a side plate 121 of the case 12. Continuously move the corresponding axis 1 to the right.
A wheel 102 having a water diameter larger than that of 01 is provided, and a hexagonal through hole 103 into which the hexagonal bar 5 is inserted is bored in the center of at least one of the shaft 101 and the wheel 102 in the longitudinal direction. . Furthermore, the right side of the wheel 102, that is, the other joint 11
A hexagonal prism-shaped convex portion 104 formed of an elastic synthetic resin and having a hollow portion in the center with a diameter larger than the height h of the end face of the hexagonal bar 5 is provided protrudingly in the direction of connection with the hexagonal bar 5. 104 is formed with a notch 105 that expands in the connection direction. Also, wheel 1
An engaging protrusion 106 that engages with a locking protrusion 123 protruding from the inner surface of the side plate 121 of the case 12 is provided on the outer peripheral surface of the hexagonal bar 5 at its end in the direction of the axis 101. It constitutes a stopper device that controls approximately 320 degrees of inversion. and clutch mechanism 7
The other joint 11 is attached to the side plate 1 of the case 12 at the right end.
A shaft 111 supported in a through hole 125 drilled in 24
is formed, and a worm gear 9 is connected to the shaft 111 to mesh with the worm 8 fixed to the tip of the operating shaft 6. In the connecting direction, a wheel 113 is formed at the end thereof with a hexagonal column-shaped recess 112 that fits into the convex portion 104 formed on the joint 10, and a hexagonal bar 5 is provided at the center of the shaft 111 and the worm 8. A shaft hole 114 having a diameter larger than the height h of the end surface is bored in the longitudinal direction and passes through the hexagonal rod 5 rotatably. The drive unit 1 having such a structure is housed in the head box 4 by fitting the notches 126 formed at both longitudinal upper edges of the case 12 into the upper edge 4a of the head box 4. In the above embodiment, the stopper device for controlling the rotation of the hexagonal bar 5 is provided inside the case 12 of the drive unit 1, but it may also be provided at an appropriate location in the head box 4, or it may be provided in the clutch mechanism 7. Convex portions 1 which are connecting portions formed on the joints 10 and 11, respectively.
04 and the recessed portion 112 are hexagonal columnar shapes, but they may have other prismatic shapes such as square or octagonal.

Next, the functions and effects of the blind opening/closing device according to the present invention will be explained along with how to use it.

To use the blind opening/closing device of the present invention, the operating shaft 6 is rotated and secured to the upper end of the operating shaft 6, similar to the conventional blind opening/closing device in which the slats are rotated by rotation of the operating shaft. The worm gear 9 is rotated via the worm 8. A wheel 102 is formed in the opening/closing range of the slat 2, that is, in the joint 10 of the clutch mechanism 7.
When the engaging protrusion 106 does not engage with the locking protrusion 123 protruding from the side plate 121 of the case 12 and the stopper device does not control the rotation of the hexagonal bar 5, the rotation of the worm gear 9 Rotates with the hexagonal bar 5 by connecting the joints 10 and 11,
The slat 2 can be opened and closed. At this time, the convex portion 104 and the concave portion 112 formed at the connecting portions of the joints 10 and 11, respectively, fit into each other, and the rotation of the worm gear 9 is transmitted to the hexagonal bar 5. If the operating shaft 6 is then accidentally rotated beyond the opening/closing range of the slat 2, that is, when the engaging protrusion 106 is engaged with the locking protrusion 123, the stopper device is activated and the joint is closed. 10 is prevented from rotating, and the hexagonal bar 5 does not rotate.
Then, when the stopper device is not operating, the joints 10 and 11 of the clutch mechanism 7 maintain a connected state by fitting their connecting protrusions 104 and recesses 112 into each other, as shown in FIG. Because the rotation of one joint 10 was controlled, the fifth
As shown in the figure, when the other joint 11 rotates, the convex part 104 of one joint 10 is formed with a cutout part 105, and since it is made of an elastic material, the convex part 104 of one joint 10 is formed with an inner surface 114 of the concave part 112 of the other joint 11. When pressed, it bends toward the center, and even though the joint 11 rotates, the joint 10 does not rotate, and the clutch mechanism is in a released state. Therefore, only the worm gear 9 rotates idly, so that the worm 8 and the worm gear 9 are not worn out or damaged, and the stopper device is also configured to directly control the rotation of the hexagonal bar 5, and the ladder cord 3 Also, the slat 2 will not be damaged.

Since the present invention is constructed as described above, even if the operating shaft is accidentally over-rotated, the rudder cord will not be cut or the slats will not be damaged.The construction is also extremely simple, and the small number of parts allows for inexpensive mass production. In particular, since the clutch mechanism is configured to be intermittent by rotational force, it has various effects such as reliable operation and durability.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a partially cutaway perspective view showing the entire device, Figure 2 is an enlarged front view showing the drive section, Figure 3 is an exploded perspective view, and Figures 4 and 5 are explanations showing the operating state of the clutch mechanism. It is a diagram. 1... Drive unit, 2... Slut, 3... Ladder cord, 4... Head box, 5... Hexagonal bar,
6...Operating shaft, 7...Clutch mechanism, 8...
...Worm, 9...Worm gear, 10, 11...
...Joint, 105...Notch, 104...Protrusion, 1
12... recess, 113... wheel.

Claims (1)

[Scope of utility model registration request] In order to operate the ladder cord for opening and closing the blind, a worm gear is fitted via a clutch mechanism to a hexagonal bar installed longitudinally inside the head box, and is rotated by a worm fixed to the upper end of the operation shaft to open and close the slat. In the blind opening/closing device with a stopper, which has an opening/closing mechanism and a stopper device for controlling the rotation of a hexagonal bar on a ladder cord drive section housed in or in a headbox, the clutch mechanism has one joint that is hexagonal. The center part is inserted into the rod, and the end in the connection direction is provided with a notch that expands in the connection direction, and a prismatic convex part with a hollow center is formed of an elastic material. A hexagonal bar is rotatably passed through the part, and a wheel having a prismatic recess that fits into the convex part formed in one of the joints is formed at the end in the connection direction, and the wheel is provided in the non-connection direction for the operation. A blind opening/closing device with a stopper characterized by being provided with a worm gear that meshes with a shaft.