JPH03275892A - Screen lifter for roll blind - Google Patents

Abstract

PURPOSE:To securely prevent the swinging of a bottom bar and a rotary arm, by providing a fitting gear at the rotary arm of a roll blind and providing a stopper at the window frame and further, a preventing means against fitting of the stopper and the fitting gear at the bearing shaft. CONSTITUTION:A fitting gear 9a moving around the periphery of a supporting shaft 11 according to the revolution of a rotary arm 4 is provided at the base end of the rotary arm 4 of a roll blind. Next, a stopper 16 is provided in order to prevent the rotary arm 4 from rotating upwards by fit with the fitting gear 9a at the window frame 8. Next, a preventing means 10 against fitting is provided to prevent fitting of a stopper 16 and the fitting gear 9a by the upward rotation sequential to the downward rotation of the rotary arm 4 in a specified angle on the supporting shaft 11. When the winding up shaft 1 is rotated to turn downwards the rotary arm 4, the rotary arm is prevented not to turn upwards. And when the rotary arm 4 is further rotated downwards by a specified angle and subsequently upwards, it can be turned upwards.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen lifting device for a roll blind that is provided on a window surface and adjusts the amount of sunlight coming in from outside.

[Conventional technology]

Conventionally, one type of roll blind is shown in FIG. 4. That is, a screen 2 is suspended from a winding shaft 1 that is rotatably supported by a case 7 fixed to the upper part of the window, and a bottom parr 3 is attached to the lower end of the screen 2. The tips of a rotating arm 4 are attached to both ends, and the base end of the rotating arm 4 is rotatably supported by a base member 5 fixed to a window frame 8. For example, an endless operating chain 6 is suspended from an operating device provided at one end of the winding shaft 1, and when the operating chain 6 is operated to rotate the winding shaft l, the screen 2 is wound onto the winding shaft 1. The screen 2 is raised and lowered by being rotated or rewound. At this time, the bottom par 3 is raised and lowered while rotating about the base end of the rotating arm 4 as a fulcrum.

Further, the winding shaft 1 is equipped with a known dead weight drop prevention device (not shown) that prevents the screen 2 from lowering due to the weight of the bottom par 3 and the rotating arm 4 when the operating chain 6 is not operated.

Therefore, in such a roll blind, screen 2
When the screen 2 is lowered halfway and then stopped, the screen 2 can be used as a sunshade when the screen 2 is lowered, as shown in the figure.

[Problems to be Solved by the Invention] In the roll blind as described above, the screen 2 is moved around the winding shaft 1 based on the weight of the bottom par 3 and the rotating arm 4.
Since the screen 2 is unwound from the ground and stretched in a bent manner, when the screen 2 stretched out in a bent manner is blown from below by the wind, the bottom par 3 and the rotating arm 4 are prevented from swinging upward and flapping. be. Therefore, as shown in FIG. 4, with the rotating arm 4 rotated to a preset angle, the rotating arm 4 is
A locking pin 19 is passed through the base end to fix the rotating arm 4 unrotatably, or a tension spring (not shown) that always applies a downward rotating force to the rotating arm 4 is rotated at the same time. A roll blind that is provided at the base end of the movable arm 4 to prevent the bottom par 3 and the rotary arm 4 from flapping has also been proposed.

However, as mentioned above, the locking pin 1 is attached to the base end of the rotating arm 4.
In the configuration where 9 is inserted, the rotating arms 4 on both sides of the screen 2
There is a problem in that the work of inserting the locking pins into the respective holes is complicated, and becomes especially complicated when the width of the screen 2 is wide. Further, if a downward rotational force is constantly applied to the rotational arm 4 by the tension spring, there is a problem in that the rotational force becomes a load on the operator when winding up the screen 2, requiring a large operating force.

The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the need for operations other than raising and lowering the screen using a screen operating means, and to provide a method for raising and lowering the screen. To provide a roll blind that can reliably prevent swinging of a bottom par and a rotating arm that support a bent screen without increasing operating force.

[Means to solve the problem]

In order to achieve the above object, the present invention suspends a screen from a winding shaft rotatably supported above the window,
A bottom par is attached to the lower end of the screen, and the bottom par is supported by the tips of a pair of rotating arms whose base ends are rotatably supported by a support shaft relative to the window frame, and the bottom par is supported by a winding shaft using an operating device. The bottom par is rotated by a rotating arm that rotates based on the weight of the bottom par and the rotating arm to take up or unwind the screen, and the screen is raised and lowered while rotating the bottom par. In a roll blind equipped with a self-weight drop prevention device that prevents the screen from lowering due to the weight of the rotating arm, a base end of the rotating arm is provided with a base end that rotates around the support shaft as the rotating arm rotates. Locking teeth are provided, the window frame is provided with a stopper that engages with the locking teeth to prevent upward rotation of the rotating arm, and the support shaft is provided with a stopper that engages with the locking teeth to prevent the rotating arm from rotating downward at a predetermined angle. The structure includes an engagement preventing means that prevents the stopper from engaging with the locking tooth by the subsequent upward rotation.

[Effect]

Therefore, in this invention, when the operating device rotates the take-up shaft and rotates the rotary arm downward, the locking teeth are engaged with the stopper and the upward rotation of the rotary arm is prevented. be done. Then, when the rotating arm is further rotated downward by a predetermined angle and then rotated upward, the rotating arm is rotated upward without the locking teeth being locked with the stopper by the engagement prevention means. It becomes possible.

〔Example〕

An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

The roll blind shown in FIG. 1 includes a case 7, a winding shaft 11 supported by the case 7, a screen 2 suspended and supported from the winding shaft 1, a bottom par 3 attached to the lower end of the screen 2, The rotating arm 4 attached to both ends of the bottom par 3 and the base member 5 to which the base end of the rotating arm 4 is fixed have the same structure as the conventional example. When the winding shaft 1 is rotated by operating an endless operating chain 6 hanging from an operating device (not shown) provided at one end of the winding shaft 1, the screen 2 is wound around the winding shaft l. Alternatively, it is rewound and the screen 2 is raised and lowered. still,
One end of the winding shaft 1 is provided with a known dead weight drop prevention device (not shown) that prevents the screen 2 from descending due to the weight of the rotating arm 4 and bottom par 3 when the operating chain 6 is not operated.

The base end of the rotating arm 4 is rotatably supported by a support shaft 11 provided on the base member 5, and the base end is formed in a circular shape with five serrated locking teeth on the outer periphery. 9a
are provided at regular intervals, thereby forming a ratchet 9. Further, the support shaft 11 has the same diameter as the ratchet 9 and has locking teeth 9a on its outer periphery.
A free ratchet 1° having teeth 10a opposite in direction is rotatably supported. This free ratchet 1
The zero teeth 10a are arranged at the same intervals and in the same number as the locking teeth 9a of the ratchet 9. Furthermore, free ratchet I
O is supported by the support shaft 11 with friction, and its rotation is restricted.

A pin 15 is formed on one side of the free ratchet 10, and a pin 15 is formed on the side of the ratchet 9.
A guide groove 1 that curves along the rotation diameter at the rotation position of the
4 is formed. Then, the pin 1 is inserted into the guide groove 14.
5 is inserted, ratchet 9 and free ratchet 10
It is possible to rotate relative to the guide groove 14 only within the length range of the guide groove 14. The length of the guide groove 14 is as shown in FIG. The tips of the teeth 10a are shifted from each other, and the pin 15 is inserted into the guide groove 14 as shown in FIG.
When the ratchet 9 is located on the A side, the tip of the locking tooth 9a of the ratchet 9 and the tip of the tooth 10a of the free ratchet 10 overlap, forming a chevron-shaped state as a whole.

A stopper 16 is rotatably supported on the shaft 12 of the base member 5 so as to come into contact with the outer peripheral surfaces of both ratchets 9°IO. A coil spring 17 is disposed between the receiving part 13 of the base member 5 and the stopper 16, so that the stopper 16 is always connected to both ratchets 9. It is biased in the IO direction. A locking pawl 16a is provided at the tip of the stopper 16, and when the locking tooth 9a of the ratchet 9 comes into contact with the top surface of the locking pawl 16a, the upward rotation of the rotating arm 4 is prevented. It has become. Also, locking claw 1
The lower surface of 6a is formed into a tapered shape, and even if the rotating arm 4 is rotated downward, the locking pawl 16a will slide over the locking teeth 9a of the ratchet 9 and the teeth 10a of the free ratchet JO, so that the rotating arm 4 can be rotated. The downward rotation of arm 4 is not prevented.

When the rotating arm 4 is rotated downward, the pin I5 comes into contact with the B side of the guide groove 14, and the tip of the locking tooth 9a of the ratchet 9 and the tip of the tooth 10a of the free ratchet 1o are shifted from each other. The free ratchet 10 rotates together with the ratchet 9. Here, as shown in FIG. 3(a), when the locking claw 16a of the stopper 16 reaches the point between immediately after getting over the locking tooth 9a and just before getting over the tooth 10a, the rotating arm 4 is moved upward. When rotated, the locking tooth 9a comes into contact with the upper surface of the locking pawl 16a, as shown in FIG. 3(b). Further, as shown in FIG. 3(c), the locking tooth 9 immediately after the locking pawl 16a of the stopper 16 gets over the tooth 10a.
Rotating arm 4 when it reaches just before crossing a.
When the is rotated upward, as shown in FIG. 3(d), due to the friction between the free ratchet 10 and the support shaft 11, first only the ratchet 9 rotates and the pin 15 moves into the A of the guide groove I4.
The end of the locking tooth 9a and the end of the tooth 10a overlap to form a chevron shape as a whole. Therefore, the locking pawl 16a slides on the chevron-shaped slope and does not come into contact with the locking tooth 9a, so that the locking tooth 9a cannot be locked with the locking pawl 16a. In this state, the free ratchet 10 is replaced by the ratchet 9.
rotates as one.

Note that the five locking teeth 9a formed on the ratchet 9 allow the rotary arm 4 to be held in an eave shape at five different angles.

Next, the operation of the roll blind configured as described above will be explained.

Now, when raising and lowering the screen 2, as shown in FIG. Screen 2 is raised and lowered. When the screen 2 is lowered by operating the operation chain 6 in this manner, the rotating arm 4 is rotated downward, and the ratchet 9 is accordingly rotated so that the pin 15 of the free ratchet 10 is moved into the guide groove 14 of the ratchet 9. The tips of the teeth 10a of the free ratchet 10 and the locking teeth 9 of the ratchet 9
When the tips of a and the free ratchet 10 are shifted from each other,
is rotated together with the ratchet 9. At this time, the locking pawl 16a of the stopper 16 overcomes the locking teeth 9a and the teeth 10a.

If the screen 2 is to be held in an overhanging state after the lowering operation of the screen 2, as shown in FIG. 3(a), the locking claw 16 of the stopper 16
When a reaches the point between immediately after getting over any of the locking teeth 9a of the ratchet 9 and just before getting over the teeth 10a of the free ratchet 10, the lowering operation of the screen 2 is stopped, and then the operating chain 6 is moved to the screen 2. Rotate in the lifting direction. Then, the rotating arm 4 is rotated upward, and the locking teeth 9a of the ratchet 9 are locked with the locking claws 16a of the stopper 16, as shown in FIG. 3(b).

Then, by further rotating the screen 2 slightly in the pulling direction, the screen 2 is held in a tensioned state. Therefore, in this state, the rotating arm 4 is prevented from rotating upward, and is also prevented from rotating downward by the self-weight drop prevention device, so even if the screen 2 is blown by the wind, the rotating arm 4 is prevented from rotating upward. And the fluttering of the bottom par 3 is reliably prevented.

As mentioned above, the locking teeth 9a of the ratchet 9 are connected to the stopper 1.
In order to pull up the screen 2 from the state where it is locked by the locking claws 16a of 6, the operation chain 6 is rotated in the direction of lowering the screen 2, and the rotation arm 4 is rotated downward. Then, as shown in FIG. 3(C), the stopper 16
When the locking pawl 16a of the free ratchet 10 reaches the point between just after it gets over the teeth 10a of the free ratchet 10 and just before it gets over the locking teeth 9a of the ratchet 9, the lowering operation of the screen 2 is stopped, and then the operation chain 6 is moved to the screen. 2 Rotate in the pulling direction. Then, as shown in FIG. 3(d), the rotating arm 4 is rotated upward, and the ratchet 9 is accordingly rotated, so that the pin 1 of the free ratchet 10 is rotated.
5 comes into contact with the A side of the guide groove 14 of the ratchet 9, and the tip of the locking tooth 9a of the ratchet 9 and the tip of the tooth 10a of the free ratchet IO overlap. In this state, the locking tooth 9a cannot be locked with the locking claw 16a of the stopper 16. Therefore, the rotating arm 4 can be rotated upward, and as the screen 2 is rolled up, the rotating arm 4 is rotated upward.

As described above, when holding the screen 2 in an eaves shape, the screen 2 is lowered to position the pin 15 of the free ratchet 10 on the B side of the guide groove 14 of the ratchet 9, and then the stopper 16 is engaged. Ratchet 9 with retaining pawl 16a
is positioned between any of the locking teeth 9a and the teeth 10a of the free ratchet 10 directly below it, and when the screen 2 is slightly pulled up from this state, the locking teeth 9a engage the locking claws 16a.
The rotating arm 4 is stopped from rotating upward. Therefore, by simply lifting and lowering the screen 2 using the operating chain 6, the ratchet 9 can be locked to the stopper 16 to easily prevent the rotating arm 4 and the bottom par 3 from flapping.
can be easily disengaged. Further, since a downward rotational force is not constantly applied to the rotating arm 4 by a spring or the like, the operating force does not increase.

Incidentally, in this invention, the teeth 10a of the free ratchet 10 are formed in a sawtooth shape, but the teeth 10a are formed in a chevron shape.
The two surfaces forming 0a are made oblique so that the locking pawl 16a of the stopper 16 can more smoothly get over the teeth 10a of the free ratchet 10 when the rotating arm 4 rotates downward. It is also possible to change the configuration of each part arbitrarily without departing from the spirit of the present invention.

〔Effect of the invention〕

As detailed above, the present invention allows the screen to be stretched out without requiring any operation other than raising and lowering the screen using the screen operating means, and without increasing the operating force for raising and lowering the screen. This provides an excellent effect of reliably preventing the bottom par and rotating arm that support the screen from swinging.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a roll blind embodying the present invention, Fig. 2 is an exploded perspective view of the same essential parts, Fig. 3 is a sectional view showing the operation of the ratchet, free ratchet, and stopper, and Fig. 4 is a conventional It is a side view showing a roll blind of. Winding shaft 1, screen 2, bottom par 3, rotating arm 4
, window frame 8, locking teeth 9a, free ratchet (engagement prevention means) 10, support shaft 11, stopper 16°

Claims (1)

[Claims] 1. A screen (2) is suspended from a winding shaft (1) rotatably supported above the window, and a bottom bar (3) is attached to the lower end of the screen (2). At the same time, the bottom bar (3) is supported at the tips of a pair of rotating arms (4) whose base ends are rotatably supported by a support shaft (11) with respect to the window frame (8), and the bottom bar (3) is wound by an operating device. The bottom bar (3) is rotated by the rotary arm (4) which rotates based on the weight of the bottom bar (3) and the rotary arm (4) by rotating the shaft (1) to wind up or unwind the screen (2). ) is rotated to raise and lower the screen (2), and the take-up shaft (1) is equipped with a self-weight drop prevention device that prevents the screen (2) from lowering due to the weight of the bottom bar (3) and rotating arm (4). In the roll blind equipped with the above-mentioned roller blind, a locking tooth (9a) that rotates around the support shaft (11) as the rotary arm (4) rotates is provided at the base end of the rotary arm (4). The locking teeth (9) are provided on the window frame (8).
a) is provided with a stopper (16) that engages with the pivot arm (4) to prevent the pivot arm (4) from pivoting upward; A screen lifting device for a roll blind, characterized in that an engagement preventing means (10) is provided for preventing engagement between the stopper (16) and the locking teeth (9a) when the stopper (16) is subsequently rotated upward.