JPH045677Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gear device for a Venetian blind in which the raising/lowering and opening/closing of the blind is operated by an operating rod hanging from a head box.

[Prior art] A blind lifting cord is passed through a hollow operating rod and pulled out from a grip equipped with a cord locking mechanism at the lower end of the operating rod, and the rotating shaft of the blind is connected to the hollow operating rod via a bevel gear mechanism. Venetian blinds have a system in which the blinds rise when you pull the lifting cord pulled out from the cord, the blinds stop when you release them, the blinds lower when you release the cord lock, and the slats tilt and the blinds open and close when you rotate the operating rod. , Japanese Patent Publication No. 58-27399, Utility Model Application Publication No. 58-35594, etc.

[Problems to be solved by the invention] When the rotating shaft that rotates the slat of the blind and the hollow operating rod are connected by a bevel gear instead of a worm, the hollow end face of the hollow operating rod opens below the rotating shaft. It is easy to pass the lifting cord inside the hollow operating rod, but unlike a worm, the bevel gear does not stop automatically, so when an object hits the slats or the slats are shaken by the wind, the rotating shaft is turned and the slats are rotated. There was a problem with the angle of inclination changing.

The present invention was made to solve the above problem, and its purpose is to provide a device in which the inclination angle of the slat does not change even if the slat is touched by a hand or the slat is swayed by the wind. It is in.

[Means for Solving the Problems] In order to achieve the above object, the features of the present invention include a head box 1 as shown in FIG.
A case 12 is attached to the case 12, and a rotating shaft 14 for rotating the slat is supported on the case, and a set of bevel gears for transmitting the rotation of the operating rod to the rotating shaft is provided, and one bevel gear 34 is provided with frictional resistance. The reason is that a friction plate 40 is provided in the case 12.

The outer peripheral surface of the bevel gear 34 is rotatably fitted into the hollow cylindrical part of the case 12, a recess 38 is provided in the inner peripheral surface 42 of the hollow cylindrical part, and a medium-height leaf spring-shaped friction braking plate 40 is fitted into the recess. It is desirable that the middle and high portion of the friction brake plate be brought into frictional contact with the outer peripheral surface of the bevel gear.

[Function] In the blind equipped with the device of the present invention, the friction plate 40 is always in contact with the outer peripheral surface of one side of a set of bevel gears that transmits the rotation of the hollow operating rod to the rotating shaft 14 to provide appropriate rotational resistance. Therefore, there is no risk that the rotating shaft will turn and the inclination angle of the slat will change even if the slat is touched by the hand or the slat is shaken by the wind.

[Example] The apparatus of the present invention will be described in more detail based on an example shown in the drawings.

As shown in FIG. 3, a case 12 is attached to one end of the head box 10 of the Venetian blind, and a rotating shaft 14 is supported on the case. A drum 16 indicated by a chain line is fixed to the rotating shaft 14, and the upper end of a ladder cord 18 is slidably hung on the drum. The ladder cord 18 supports a group of slats 20 arranged vertically, and its lower end is locked to a bottom rail 22. The bottom rail 22 is fixed to one end of the lifting cord 24. The lifting cord 24 passes through the slat 20 and enters the head box 10, and then passes through the guide roll 26 pivotally supported by the case.
It enters the hollow shaft of the other bevel gear through the hollow joint 28 and is pulled out from the grip 31 at the lower end of the hollow operating rod 30. Although not shown, the grip 31 is provided with a cord locking mechanism inside, and can freely lock and release the lifting cord 24.

As shown in FIGS. 1 and 2, a pinion 32 fixed to the rotating shaft 14 meshes with internal teeth 35 of one bevel gear 34 rotatably fitted into the case 12. A recess 38 is provided in the inner circumferential surface 42 of the case 12 that receives the outer circumferential surface of the bevel gear 34, and a leaf spring-shaped friction plate 40 with a center height is inserted into the recess. The central high portion of the friction plate 40 always presses against the outer circumferential surface of the bevel gear 34. bevel gear 34
meshes with the other bevel gear 36, and the other bevel gear 36 is also bearingly supported by the case 12. The lifting cord 24 passes around the guide roll 26 and enters the hollow shaft portion 37 of the other bevel gear 36 .

Although the bevel gear 34 in the embodiment rotates in the same direction as the rotating shaft via internal teeth and a pinion, the bevel gear may be directly fixed to the rotating shaft without using a gear mechanism.

The friction plate 40 in the embodiment is shaped like a leaf spring and presses against the bevel gear with its own elastic force, but a coil spring may be inserted and the friction plate is pressed against the bevel gear with the elastic force of the coil spring, if necessary. An adjustment bolt may be screwed into the case, and the elastic force of the coil spring may be adjusted using the bolt to adjust the frictional resistance of the friction plate.

Next, the operation of the device of the present invention will be explained.
To adjust the angle of inclination of the slat, use grip 3.
1, the rotation is transmitted to the other bevel gear 36 via the hollow joint 28, and the other bevel gear 36 turns one bevel gear 34, so the rotation is transmitted to the rotating shaft 14 via the pinion 32 that meshes with the internal teeth 35. is transmitted, and the slope of the slat changes. At this time, it receives rotational resistance from the friction plate 40, but
This does not make it difficult to operate, but rather improves operability by eliminating the problem of being too light.

When something touches the slat 20 or the slat is swayed by the wind and one side of the rudder cord 18 is pulled, the drum 16 on which the rudder cord 16 is hung tries to rotate together with the rotating shaft 14, and the rotation is stopped. Bevel gear 3 via pinion 32 and internal teeth 35
4, but is blocked by the friction plate 40 that makes frictional contact with the outer peripheral surface of the bevel gear 34.
The rotating shaft 14 cannot rotate. Therefore, even if a person touches the slats 20 or the slats are swayed by the wind, the angle of inclination of the slats 20 will not change.

[Effects of the invention] As mentioned above, the device of this invention has a simple structure in which a friction plate is attached to the case that houses the bevel gear, but the slats can be easily removed by simply touching the slats or shaking them due to the wind. Unlike the case where the angle of inclination of the slat changes, it has the advantage that the angle of inclination of the slat remains stable unless the operating rod is rotated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a device according to an embodiment of the present invention;
2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is a side view showing the main parts of a Venetian blind equipped with the device shown in FIG. 1. In the figure, numeral 10 is a head box, 12
is a case, 14 is a rotating shaft, 28 is a hollow joint, 32
is a pinion, 34 is a bevel gear, 35 is an internal tooth, 3
6 is a bevel gear, 37 is a hollow shaft part, 38 is a recessed part,
40 represents a friction plate, and 42 represents an inner circumferential surface.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a case provided in a head box, a rotating shaft bearing on the case, and a set of bevel gears rotatably provided on the case, one of the bevel gears a device that engages with a shaft and rotates in the same direction, the other bevel gear having a hollow shaft portion, and the hollow shaft portion being connected to a hollow operating rod via a hollow joint; A gear device for a Venetian blind, characterized in that a recess is provided in the inner peripheral surface of the case into which the outer peripheral surface of the bevel gear is fitted, and a friction plate that contacts the outer peripheral surface of one of the bevel gears is provided in the recess. 2. A gear device for a Venetian blind according to claim 1, wherein the friction plate is formed in the shape of a leaf spring with a middle height in the center, and the middle part of the friction plate comes into contact with the outer circumferential surface of the bevel gear. 3. Claim 1 of the utility model registration, which is characterized in that one bevel gear is fixed to the rotating shaft.
A gear device for a Venetian blind according to item 1 or 2. 4. The Venetian blind according to claim 1 or 2, characterized in that one bevel gear is provided with internal teeth, and the internal teeth are engaged with a pinion fixed to the rotating shaft. gearing.