JP2634515B2 - Blind brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind braking device for slowing down and stopping a lower chord material when a blind is opened and closed by an elevating operation of an elevating device when shifting from an open state to a closed state.

[0002]

2. Description of the Related Art A blind which is suspended and supported by a lifting rope penetrating a slat and which is opened and closed by a vertical movement of a moving pulley around which the rope is wound,
The moving pulley is integrated and stops at an arbitrary open position when the lifting / lowering device that moves up and down along the locking member laid in the height direction is locked at the rack of the locking member and is released from the rack. Opening and closing are free, and the opening and closing operation is performed by the elevating device as it is.

[0003] When a blind by a lifting device that switches between stop and lifting by being locked to or released from a rack is moved from an open state to a closed state, the lifting device is released from the rack and released as it is. The lower chord descends due to its own weight and becomes closed, but since the conventional lifting device only has the function of opening and closing the blind and stopping at any open position, the movement amount from the open state to the closed state is particularly large. If it is large, when the lifting device is released, the lifting rope bears the tension due to the impact, and the repeated impact load may break the lifting rope. If there is not enough clearance between the lower chord at the time of closing and the lower frame of the window frame or the lower frame of the shoji, there is also a danger that the lower chord may be damaged by colliding them.

[0004] Therefore, in order to prevent obstacles due to falling of the lower chord material, it is usually necessary to hold the lifting device by hand until the blind is completely closed, and manually brake the lower chord material drop.

The present invention has been made in view of a problem encountered when closing a blind which is opened and closed by raising and lowering a lifting device, and aims to newly propose a device which eliminates the above-mentioned obstacle without holding the lifting device. Is what you do.

[0006]

According to the present invention, the input gear meshes with the rack, and the rotation of the input gear when the elevating device rises, that is, when the lower chord of the blind descends, is a friction that reduces the rotation speed. By transmitting the force to the braking member that generates the force and applying the braking to the rotation of the input gear by the operation of the braking member, that is, the lifting of the lifting device, the lower chord material is lowered when the blind is closed while the lifting device is released. Automatically decelerates to apply an impact load to the lifting rope when the lower chord falls, and to avoid collision between the lower chord and the lower frame or the lower frame.

[0007] After the brake member is released from the rack, only the rotation of the input gear when the elevating device rises due to the free fall of the lower chord material is transmitted, and a frictional force corresponding to the number of rotation is applied to the input gear. The number of revolutions of the input gear is reduced, and the input gear is braked without depending on the holding of the elevating device.

Since the braking member generates a frictional force in accordance with the rotation speed of the input gear, the braking force increases immediately after the lower chord material starts to descend when the rotation speed of the input gear increases. Slow down, then descend at a constant speed,
Stops slowly at the lower limit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing one embodiment.

[0010] braking device D of the invention is suspended supported lifting ropes R to penetrate the entire slat b ₀ as shown in FIG. 3,
In a blind B which has a moving pulley P around which it is wound and which is opened and closed by a lifting / lowering operation of a lifting / lowering device L which can be locked to a rack 8a formed on a locking member 8 laid in the height direction, the lifting / lowering device L is released from automatically reduces without the falling speed of the lower chord member b ₁ when the blind B is closed manually, but to stop.

One end of the lifting rope R is connected to the lower chord material b ₁ , penetrates all the slats b ₀ , passes through a moving pulley P fixed to the lifting device L, and the other end is fixed to the upper chord material b ₂ side, Open and close while supporting B.

As shown in FIG. 3, the lifting device L is laid beside the blind B, and is installed so as to be able to move up and down along a locking member 8 having a rack 8a formed in the height direction.

As shown in FIG. 1, the lifting device L has a claw 9 which is locked to the rack 8a to stop itself at an arbitrary position, and a lever 10 which operates to lock and release this claw 9. Ten
Lever with the claw 9 released from the rack 8a by the operation of
The blind B is freely opened and closed by moving up and down while holding the 10, and the blind B is stopped at an arbitrary open position by locking the claws 9 to the rack 8 a. The lever 10 rotates between the horizontal axis of the lifting / lowering device L and switches the engagement of the claw 9 to the rack 8a and the release from the rack 8a. In FIG. 1, a chain line in a state where the lever 10 is lying indicates a position when the elevating device L descends.

FIG. 2 shows that the lifting device L and the braking device D are connected to a sliding door S _1.
When applied to the blind internal sash S arranged blind B between the inner sash S ₂ and illustrates the fit example. In this case, the locking member 8 is laid along the surface of the vertical frame f on the indoor side, and the lifting device L is placed in the vertical frame f on the indoor side.
And the braking device D are stored, and only the lever 10 protrudes from the vertical frame f.

As shown in FIG. 1, the braking device D is pivotally supported by the case 7, and the input gear 1 that is engaged with the rack 8a at a portion protruding therefrom, and the input gear 1 that is stored in the case 7 when the lifting device L is raised. When the gear 1 rotates, the rotation is transmitted to generate a frictional force according to the number of rotations, and the braking member 2 brakes the rotation of the input gear 1 in that direction.
Together with the lifting device L. One or more braking devices D are installed in the lifting device L according to the braking force.

The shaft 1a of the input gear 1 rotates simultaneously with the rotation of the input gear 1 only when the lifting / lowering device L rises, as shown in FIG. 4, and outputs an output for transmitting the rotation of the input gear 1 to the braking member 2. The gear 3 is mounted on the shaft.

The transmission of the rotation of the input gear 1 to the output gear 3 in one direction is performed by a clutch 5 interposed between the input gear 1 and the output gear 3. The clutch 5 is composed of a coil spring which is inscribed in the input gear 1 and one end of which is engaged with the output gear 3, as shown in FIG.

The direction in which the coil spring is locked to the output gear 3 coincides with the rotation direction of the input gear 1 when the lifting device L is raised, and the direction in which the coil spring is locked to the output gear 3, ie, the lifting device Input gear 1 when L rises
Is transmitted to the output gear 3 by contact pressure only at the time of the rotation of the lifting device L. When the rotation in the opposite direction, that is, the rotation when the lifting / lowering device L descends, it slides to isolate the rotation.

A worm wheel 4 meshes with the output gear 3, and a shaft of a worm 6 meshes with the worm wheel 4.
The braking member 2 is connected to 6a.

In the embodiment, as shown in FIG.
Engaging the intermediate gear 4 ₀ number of teeth less than the, and transmitted to the worm wheel 4 by accelerated rotation of the output gear 3. The number of teeth of the worm wheel 4 is larger than the number of teeth of the intermediate gear 4 _0, similarly to transmit the rotation of the intermediate gear 4 ₀ the worm 6 by accelerated, eventually increasing the rotational speed of the output gear 3 It is transmitted to the braking member 2.

The braking member 2 is formed of an elastic body such as rubber which easily deforms elastically. As shown in FIG. 4, the braking member 2 is provided with a clearance between the case 7 and a circular inner wall 7a. 6 and attached to the shaft 6a.

The braking member 2 rotates at the same time as the rotation of the worm 6 transmitted from the output gear 3, and generates frictional force by contacting the inner wall 7a by deformation due to centrifugal force. Apply braking and slow it down. As the worm 6 is decelerated, the rotation speed of the worm wheel 4 and the output gear 3 that mesh with each other decreases, the rotation speed of the input gear 1 coaxial with the worm wheel 4 also decreases, and the input gear 1 gradually stops.

The frictional force generated by the braking member 2 is
As the rotation speed of the input gear 1 increases, the lifting device L starts to rise and exerts a braking effect as the rotation speed of the input gear 1 increases, thereby reducing the rotation speed and rapidly reducing the speed of the lifting device L. .

The lifting device L is operated by operating the lever 10 so that the claw 9 is moved.
There is released from the rack 8a, but increases with free fall of the lower chord member b ₁ By it is let go, the braking of the braking member 2 is effective against the more when the rotational speed of the street input gear 1 described above is high, lower chord member b ₁ after drop, the lifting device L is automatically decelerated by post rises shortly braking device D, the lower chord member b ₁ by also decreases braking effect with decreasing speed of the lifting device L gradually reaches the stationary state, Stop at a predetermined closed position.

[0025]

As described above, the present invention engages an input gear with a rack and transmits the rotation of the input gear when the elevating device rises to a braking member that generates a frictional force that reduces the number of rotations. The rotation of the input gear, that is, the lifting of the elevating device is braked by the operation of the braking member, and the lower chord material when the blind is closed is automatically decelerated and stopped while the lower chord material is stopped. No impact load is applied to the lower chord material, collision between the lower chord material and the lower frame or lower frame can be avoided, and obstacles such as breakage of the lifting rope and breakage of the lower chord material can be prevented.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a state in which a braking device is installed in a lifting device.

FIG. 2 is a cross-sectional view showing a state of fitting when the lifting device is installed on a blind built-in sash.

FIG. 3 is a perspective view showing the entire contents of a blind and a lifting device.

FIG. 4 is a plan view showing a braking device.

FIG. 5 is a longitudinal sectional view of FIG.

[Explanation of symbols]

B ...... blind, b ₁ ...... lower chord member, b ₀ ...... slat, b ₂
… Upper chord material, R… Lifting rope, P… Moving pulley, L…
Elevating device, D ... Brake device, 1 ... Input gear, 1a ...
Axis, 2 ...... braking member, 3 ...... output gear, 4 ₀ ...... intermediate gear, 4 ...... worm wheel 5 ...... clutch, 6 ......
Worm, 6a ... axis, 7 ... case, 7a ... inner wall, 8 ...
... Locking member, 8a ... Rack, 9 ... Claw, 10 ... Lever,
S ...... blind built-in sash, S ₁ ...... outside Shoji, S ₂ ...... in Shoji, f ...... vertical frame.

Claims (1)

(57) [Claims] 1. A one end connected to the lower chord member b _1, all slats
is supported by the lifting ropes R penetrating the b _0, in the blind B to open and close with the lifting of lockable lifting device L on the rack 8a of the locking member 8 which is laid in the height direction, the rack of the lifting device L a device for stopping while automatically decelerating the lower chord member b ₁ descending during release from 8a, the input gear 1 meshes with the rack 8a, its rotation during rotation of the input gear 1 when the lifting device L is increased A braking member that is transmitted and generates a frictional force in accordance with the number of rotations, and that brakes the rotation of the input gear 1 to decelerate the lifting device L.