JPH0616134Y2 - Roll blind elevating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Use) This invention relates to a lifting device for a roller blind.

(Prior Art) Conventionally, a torsion coil spring is disposed in a winding shaft that winds a screen as one type of elevating device for elevating a roller blind, and when the screen is pulled down, the torsion coil spring stores energy to When pulling up, there is one that automatically pulls up by using its accumulated power. Such an elevating device is provided with a governor device that acts by a centrifugal force associated with the rotation of the winding shaft in order to appropriately suppress the pulling speed of the screen, and when the rotating speed of the winding shaft becomes excessive, By operating the governor device, the screen pulling speed was suppressed to prevent noise and improve quality.

(Problems to be solved by the invention) However, in the lifting device as described above, the governor device operates according to the rotation speed of the winding shaft, and therefore the governor device operates even when the screen is vigorously pulled down. There was a problem that it hindered the pulling operation.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention suspends and supports a screen from a winding shaft, and attaches the winding shaft in a screen winding direction by a biasing means. The screen can be pulled up by the urging force of the urging means, and the governor weight is slid on the governor drum by the centrifugal force acting along with the rotation of the take-up shaft. In a roller blind provided with a governor device for restricting excessive rotation of the take-up shaft, the governor shaft 27 rotating with the rotation of the winding shaft 4 is provided with a disk part 32, and the disk part 32 has Second guide shafts 33 and 34 are provided, and the governor weight 35 is provided with first and second elongated holes 36 and 38,
While inserting the first guide shaft 33 into the first elongated hole 36 so as to be movable in the rotation direction of the disc portion 32,
The second guide shaft 34 is inserted into the second elongated hole 38 so as to be movable in the rotation direction of the disc portion 32, and the first and second guides are inserted into the second elongated hole 38. Shafts 33, 34
Only when is rotated in the screen pulling direction,
A wide portion 38b that allows the governor weight 35 to move to a position where it slides on the governor drum 25 is provided.

(Operation) By the above means, the second guide shaft 34 can be moved in the second elongated hole 38 in the direction of the wide portion 38a and the governor weight 35 can be moved in the direction away from the center of the governor shaft 27 only when the screen is pulled up. It will be in a state.

(Embodiment) An embodiment embodying the present invention will be described below with reference to the drawings. As shown in FIG. 2, a roller blind 1 has mounting brackets 3 on both sides of a frame body 2 fixed to an upper frame such as a window.
a and 3b are screwed, and their mounting brackets 3a and 3b
A take-up shaft 4 is rotatably supported between b, and a cloth screen 5 is suspended from and supported by the take-up shaft 4. As shown in FIG. 1, a torsion coil spring 6 as an urging means is disposed in the winding shaft 4, and one end of the torsion coil spring 6 is a drive plug 7.
Is fixed to the take-up shaft 4 via, and the other end (not shown) is fixed to the mounting bracket 3b via a connecting member.
Then, when the screen 5 is pulled down, the torsion coil spring 6 is energized, and the energizing force of the torsion coil spring 6 energizes the screen 5.
Is being raised.

On one side of the winding shaft, a clutch device 8 for suspending and supporting the screen 5 at a desired position against the stored force of the torsion coil spring 6 and a governor device 9 for appropriately suppressing the pulling speed of the screen 5 are provided. Is provided. The structure will be described in detail. The bracket shaft 10 is screwed to the lower portion of the mounting bracket 3a.
At 0, a shaft portion 11 that projects laterally in a cylindrical shape is formed. A base end portion of a substantially cylindrical clutch cap 12 is rotatably supported on the outer periphery of the shaft portion 11,
One end of the winding shaft 4 is fitted and fixed to the outer peripheral surface of the clutch cap 12.

The base end portion of the brake drum 13 is fitted and fixed to the inner periphery of the shaft portion 11 of the bracket shaft 10, and the outer peripheral surface of the brake drum 13 located inside the clutch cap 12 with a slight gap has a cross section of half. Circular guide groove 1
4 are formed. A slide groove 15 having a semicircular cross section is also formed on the inner peripheral surface of the clutch cap 12 in the longitudinal direction, and a clutch ball 16 as a protrusion is disposed between the slide groove 15 and the guide groove 14. Has been done. When the clutch cap 12 rotates, the clutch ball 16 moves in the guide groove 14 while moving in the slide groove 15 in the lateral direction of FIG.

The guide groove 14 will be described in the expanded state shown in FIG. 4. In the figure, when the screen 5 is lowered, the clutch ball 16 moves in the direction of arrow A, and when the screen 5 is pulled up, the clutch ball 16 moves in the direction of arrow B. Move to. A pull-down groove 17 is provided on the tip side of the brake drum 13.
Are formed in an annular shape in the circumferential direction, and in the pull-down groove 17, there are provided first bending portions 18 that bend toward the base end side of the brake drum at two equal intervals, that is, 180 with respect to the center of the brake drum 13.
It is formed at intervals of degrees. A pull-up groove 19 is formed in a circumferential annular shape on the base end side of the brake drum 13, and in the pull-up groove 19, second curved portions 20 that bend toward the brake drum front end side are formed at two equal intervals. . The curved portions 18 and 20 are positioned so as to be offset from each other in the circumferential direction.

A stop groove 21 is formed from the first curved portion 18 in the screen pulling direction, and an end point portion 21a thereof is obliquely bent toward the base end side of the brake drum 13.

The first return groove 22 connected to the end point portion 21a extends slightly in the screen pull-down direction and then extends obliquely to the pull-up groove 19 side,
From that position, it extends in the screen pulling direction and communicates with the second curved portion 20 of the pulling groove 19. The first return groove 22 communicates with the second return groove 23 from a position obliquely extending to the pull-up groove 19 side, and the second return groove 23 communicates with the pull-down groove 17.

A planetary drum 24 and a governor drum 25 are fitted to the tip of the clutch cap 12. Both drums 24, 25
A support shaft 26 is passed through the center of the support shaft 26, one end of the support shaft 26 is supported and fixed to the brake drum 13, and the other end thereof is supported and fixed to the governor drum 25. A governor shaft 27 is rotatably supported by the support shaft 26, and a sun gear 28 is formed on the outer peripheral surface of the governor shaft 27 in the clutch cap 12.

Four planetary gears 30 rotatably supported by a planetary drum via a gear shaft 29 are arranged around the sun gear 28,
The planet gear 30 meshes with the sun gear 28. The tip of the brake drum 13 is located around each planetary gear 30, and inner teeth 31 are formed on the inner peripheral surface thereof.
The planetary gears 30 mesh with each other. Therefore, when the clutch cap 12 rotates, the planetary gears 30 move to the inner teeth 31.
In addition, since it rotates while meshing with the sun gear 28, the governor shaft 27 reversely rotates at a higher rotation speed than the clutch cap 12 via the sun gear 28. The number of teeth of each gear 28, 30 is set so that the governor shaft 27 rotates in the reverse direction at a rotational speed four times the rotational speed of the clutch cap 12.

The governor shaft 27 is circumferentially extended in the governor drum 25 to form a disc portion 32. As shown in FIG. 5, a side face of the disc portion 32 is provided with a first guide shaft 33 on the center line. Two guide shafts 34 are provided at equal intervals from the center, and two second guide shafts 34 are provided at equal intervals from the center on a center line orthogonal to the center line. The distance between the first guide shafts 33 is slightly larger than the distance between the second guide shafts 34.

A pair of governor weights 35 are supported on each of the guide shafts 33 and 34 as a set of adjacent guide shafts. That is, the governor weight 35 is formed in a substantially crescent shape, and a first elongated hole 36 that curves along the outer peripheral surface is formed at one end thereof, and the first elongated hole 36 is formed.
A sliding portion 37 is projected on the outer peripheral surface in the vicinity. A second elongated hole 38 is formed at the other end of the governor weight 35. The second slot 38 has a substantially triangular shape that widens toward the other end of the governor weight 35.
6 is closest to the outer peripheral surface 39, and the wide portion 38b is formed in a direction away from the outer peripheral surface 39 and the top portion 38a. Then, the first guide shaft 33 is movably inserted into the first elongated hole 36, and the second guide shaft 34
Is movably inserted into the second elongated hole 38. Therefore, when the governor shaft 27 is rotated in the arrow C direction in FIG. 5, that is, in the screen pulling down direction, both guide shafts 33,
34 moves in the same direction in both of the long holes 36 and 38, the second guide shaft 34 moves toward the second long hole 38 as shown in FIG.
The governor weight 35 moves so as to be positioned at the top portion 38a of the. That is, both governor weights 35 move in a direction in which they approach each other due to the inertial force, and the state shown in the same figure is obtained. When the governor shaft 27 moves in the direction of arrow D, that is, in the screen pulling direction, both guide shafts 33, 3
4 moves in the same direction in both slots 36, 38,
As shown in the figure, the second guide shaft 34 moves into the wide portion 38a of the second elongated hole 38, and the governor weight 35 is in a state of being rotatable outward with the first guide shaft 33 as a fulcrum. When the rotation speed of the governor shaft 27 increases and the centrifugal force acting on the governor weight 35 increases in this state, the sliding portions 37 of both governor weights 35 slide on the inner peripheral surface of the governor drum 25, as shown in FIG. I have come into contact with them.

Next, the operation of the roller blind lifting device configured as described above will be described.

Now, when the screen 5 of this roll blind is pulled down against the biasing force of the torsion coil spring 6, the winding shaft 4
The clutch cap 12 is rotated via. At this time, the clutch ball 16 repeatedly moves in the direction of the arrow A in the pull-down groove 17 shown in FIG. Also, governor drum 2
5, the disc portion 32 of the governor shaft 27 is rotated in the direction of arrow C as shown in FIG. 5, so that the governor weight 35 is provided with the first and second elongated holes 36, 38 as shown in FIG.
Rotate while moving along. That is, since the two guide shafts 33, 34 move in the both elongated holes 36, 38, and particularly the second guide shaft 34 moves to the top portion 38a of the second elongated hole 38, the sliding portion 37 of the governor weight 35. Moves away from the inner peripheral surface of the governor drum 25. Therefore, when the screen 5 is pulled down, friction does not occur between the governor drum 25 and the governor weight 35, and an operating force sufficient to store the torsion coil spring 6 is sufficient.

When the screen 5 is pulled down to a desired position and the hand is released, the screen 5 is slightly pulled up by the stored force of the torsion coil spring 6 and then its movement is stopped. That is,
In FIG. 4, the clutch ball 16 moving in the pull-down groove 17 in the direction of arrow A when the screen is pulled down moves backward in the pull-down groove 17, and due to its inertial force, moves from the first curved portion 18 into the stop groove 21. It enters and is locked at the end point 21a. In this state, the rotation of the winding shaft 4 and the clutch cap 12 in the screen pulling direction due to the stored force of the torsion coil spring 6 is blocked by the brake drum 13 via the clutch ball 16, so that the screen 5 is hung at that position. Supported.

When the screen 5 is slightly pulled down from this state, the clutch ball 16 moves from the first return groove 22 into the second return groove 23 due to its inertial force, and when the hand is released in this state, the clutch ball 16 twists. The stored force of the coil spring 6 causes the coil spring 6 to move from the second curved portion 20 into the pull-up groove 19, and the movable state in the pull-up groove 19 can be repeated. Therefore, the screen 5 is pulled up to the uppermost position by the stored force of the torsion coil spring 6.

When the screen 5 is pulled down from the state where the clutch ball 16 is located at the end point portion 21 of the stop groove 21, the clutch ball 16 returns from the first return groove 22 through the second return groove 23 into the pull-down groove 17. The state in which the pull-down groove 17 can be continuously moved is achieved. Therefore, when the screen 5 is pulled down from the state in which the clutch ball 16 is locked at the end portion 21a of the stop groove 21 and the screen 5 is prevented from being pulled up, the clutch ball 16 automatically pulls down.
Since it moves into the inside 7, the screen 5 can be further lowered.

On the other hand, when the clutch ball 16 continuously moves in the pull-up groove 19 and the screen 5 is pulled up, the rotation of the take-up shaft 4 rotates through the clutch cap 12, the planetary drum 24, the planetary gear 30, and the sun gear 28. Shaft 2
7, the disc portion 32 is rotated in the direction of arrow D in FIG. Then, as shown in FIG. 6, the first and second guide shafts 33 and 34 move in the first and second elongated holes 36 and 38, and the second guide shaft 34 becomes the second elongated hole 38. Wide part 3
Move to 8b. At this time, if the accumulated force of the torsion coil spring 6 is excessive and the pulling speed of the screen 5 is too fast,
The governor shaft 27 rotates faster, the centrifugal force acting on the governor weight 35 increases, and the governor weight 35 increases.
Rotates outward with the first guide shaft 33 as a fulcrum.

As a result, the sliding portion 37 of the governor weight 35 is in sliding contact with the inner peripheral surface of the governor drum 25 that rotates in the opposite direction at a quarter of the rotation speed of the governor weight 37, and rotation of the winding shaft 4 is suppressed. . Therefore, the pulling speed of the screen 5 is appropriately suppressed even when the stored force of the torsion coil spring 6 is excessive. The weight and shape of the governor weight 35 are set so that the governor weight 35 does not come into sliding contact with the governor drum 25 when the lifting speed of the screen 5 is not excessive.

As described above, in this lifting device, when the screen 5 is pulled down to the desired position and the hand is released, the clutch ball 16 is locked to the end point portion 21a of the stop groove 21 and the screen 5 is suspended and supported at that position. When the screen 5 is slightly lowered to move the clutch ball 16 to the first return groove 22 and let go, the screen 5 is twisted and the coil spring 6 is released.
It is pulled up to the highest position by the accumulated power of. On the other hand, when the screen 5 is pulled down from a state where the screen 5 is suspended and supported at a desired position, the clutch ball 16 automatically returns to the pull-down groove 17 through the first and second return grooves 22 and 23. Therefore, the torsion coil spring 6
The screen 5 can be pulled down only by the operation force that opposes the stored force.

Also, when the screen 5 is pulled up at an excessive speed by the governor device 9, the pulling speed can be appropriately suppressed, and when the screen 5 is pulled down, the governor device 9 operates even if the screen 5 is pulled down rapidly. Since it does not, the operation can be performed quickly and with a slight operation force.

Effect of the Invention As described in detail above, this invention can suppress the excessive rotation speed of the winding shaft 4 by moving the governor weight 35 outward only when the screen 5 is pulled up. This has the excellent effect that the pulling-down operation of the screen can be quickly performed without operating the.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a screen lifting device showing an embodiment embodying the present invention, FIG. 2 is a front view of a roll blind relating to the present invention, and FIG. 3 is a sectional view showing a brake drum portion of the lifting device. FIG. 4 is a developed view of the guide groove, and FIGS. 5 and 6 are sectional views showing the operation of the governor device. Winding shaft 4, screen 5, governor device 9, governor drum 25, governor shaft 27, disk portion 32, first guide shaft 33, second guide shaft 34, governor weight 35, first elongated hole 36, first Second elongated hole 38, wide portion 38b.

Claims (1)

[Scope of utility model registration request] 1. A screen is suspended from a winding shaft, and the winding shaft is biased by a biasing means in a screen winding direction so that the screen can be pulled up by the biasing force of the biasing means. In the roll blind provided with a governor device for controlling excessive rotation of the winding shaft by sliding a governor weight on the governor drum by a centrifugal force acting in association with the rotation of the winding shaft. The governor shaft (27) that rotates with the rotation of the take-up shaft (4) is provided with a disc portion (32), and the disc portion (32) is provided with the first and second guide shafts (33, 34). The governor weight (35) is provided with first and second elongated holes (36, 38), and the first elongated guide hole (36) is provided with the first guide shaft (33). While being inserted movably in the rotation direction of (32), The second guide shaft (34) is inserted into the second elongated hole (38) so as to be movable in the rotation direction of the disc portion (32), and the second elongated hole (38) has the A wide portion that allows the governor weight (35) to move to a position where it slides on the governor drum (25) only when the first and second guide shafts (33, 34) are rotated in the screen pulling direction. (38b) is provided, The raising-lowering apparatus of the roller blind characterized by the above-mentioned.