JP7496284B2 - Sunshade device - Google Patents

Description

The present invention relates to a solar shading device equipped with a brake mechanism that slows down the descent speed of the shading body.

Conventionally, a reduction gear for a solar shading member has been disclosed in which a planetary gear type speed increasing mechanism and a centrifugal brake mechanism are provided between a rotating input shaft and a fixed case (for example, see Patent Document 1 (Claim 1, paragraphs [0013], [0023], Figures 1, 2, 5 and 6)). In this reduction gear for a solar shading member, the centrifugal brake mechanism includes a rotating support provided to be interlocked with the rotating input shaft, a centrifugal body whose base end side is journaled on the rotating support and whose open end side is swingable, a biasing spring piece integrally molded from synthetic resin with the rotating support that slides against the outside of the centrifugal body and biases the centrifugal body inward, and a brake shoe fixed to the centrifugal body. In addition, the planetary gear type speed increasing mechanism increases the rotation of the rotating support, so that the friction surface of the brake shoe is pressed against the inner surface of the fixed case, and the rotation of the rotating input shaft is reduced by the frictional force between the brake shoe and the fixed case. The shielding member mainly comprises a pair of side plates attached to a set frame fixed to a window frame or the like, a winding pipe rotatably supported at both ends by the pair of side plates, a screen connected at one end to the winding pipe and hung so that it can be wound up and unwound on the winding pipe, a weight bar attached to the bottom end of the screen, and a puller attached to the bottom end of the weight bar.

In a reduction gear device for solar shading members configured in this way, the rotational speed of the winding pipe is slow immediately after the screen is unwound, so the reduction mechanism does not operate. However, once the screen has been pulled out to a certain extent, the rotational speed of the winding pipe also increases due to inertia, and the rotating support body becomes even faster due to the planetary gear speed increase mechanism. As a result, the centrifugal body spreads out against the biasing force of the biasing spring piece due to centrifugal force, and the brake shoe is pressed against the inner surface of the fixed case, and the frictional force reduces the rotational speed of the rotating input shaft. In this way, the spread of the centrifugal body is suppressed, so the roll screen does not fall suddenly.

Patent No. 4994778

In the reduction gear for solar shading members shown in the above Patent Document 1, the range of variation of the braking force can be a problem. For example, in a centrifugal brake mechanism, the rotation speed of the centrifugal governor changes according to the weight of the screen, so that the mechanism exerts a braking force according to the weight of the screen. However, in the reduction gear for solar shading members shown in the above Patent Document 1, the braking force has a range of variation, so depending on the range of variation, it may not be possible to handle all screen weights. In other words, if the braking force is too strong for the screen weight, the screen does not descend to the specified position, and conversely, if the braking force is too weak for the screen weight, the screen falls sharply. In addition, there was also the problem that such defects are dependent not only on the screen weight, but also on the sliding resistance between the components in the product and the construction environment. Therefore, it was necessary to prepare reduction gears with different specifications that have different numbers of centrifugal bodies and brake shoes installed, and use the reduction gears depending on the screen weight or products with different mechanisms, or to replace the reduction gears with different specifications if there is a defect after construction.

The object of the present invention is to provide a solar shading device in which the braking force of the brake mechanism can be adjusted to suit the solar shading device, even if the weight of the shading body is different for different models, or even if the sliding resistance between components is different for the same model.

As shown in Figs. 1, 2, 6 and 8, the first aspect of the present invention is a solar radiation shading device 10 including a drive shaft 16 that rotates forward or backward to raise and lower the shielding body 12, a brake mechanism 17 that decelerates the drive shaft 16, and a planetary gear mechanism 18 that is provided between the drive shaft 16 and the brake mechanism 17 and adjusts the deceleration of the drive shaft 16 by the brake mechanism 17. The planetary gear mechanism 18 includes a sun gear 21 that is loosely fitted on the drive shaft 16, an internal gear 19 that is concentric with the sun gear 21 and surrounds the sun gear 21 at a predetermined interval, a plurality of planetary gears 22 that are located between the sun gear 21 and the internal gear 19 and mesh with the sun gear 21 and the internal gear 19, and a plurality of planetary gears 22 that are loosely fitted on the drive shaft 16. The device has a planetary carrier 23 that holds the planetary gear 22 so that it can rotate on its own axis and revolve around the sun gear 21, and further includes an adjustment mechanism 26 having an elastic member 26a that can be pressed against the internal gear 19 in the axial direction of the drive shaft 16. The planetary carrier 23 or the sun gear is connected to the drive shaft 16, and the sun gear 21 or the planetary carrier is connected to a brake mechanism 17. The adjustment mechanism 26 adjusts the force with which the elastic member 26a is pressed against the internal gear 19 to slow down or stop the rotational speed of the internal gear 19, thereby increasing the rotational speed of the sun gear 21 or the planetary carrier, and the brake mechanism 17 exerts its braking function to slow down the rotational speed of the drive shaft 16.

The second aspect of the present invention is a solar radiation shading device having a drive shaft that rotates forward or backward to raise and lower a shield, a brake mechanism that decelerates the drive shaft, and a planetary gear mechanism that is provided between the drive shaft and the brake mechanism and adjusts the deceleration of the drive shaft by the brake mechanism, in which the planetary gear mechanism comprises a sun gear fitted to the drive shaft, an internal gear that is provided concentrically with the sun gear and surrounds the sun gear at a predetermined interval, a plurality of planetary gears that are located between the sun gear and the internal gear and mesh with the sun gear and the internal gear, and a planetary gear that is capable of rotating the plurality of planetary gears and The device has a planetary carrier that is held so that it can revolve around the sun gear, and further includes an adjustment mechanism having an elastic member that can be pressed against the sun gear in the axial direction of the drive shaft, the internal gear or planetary carrier is connected to the drive shaft, the planetary carrier or internal gear is connected to a brake mechanism, and the adjustment mechanism adjusts the force with which the elastic member is pressed against the sun gear to slow down or stop the rotational speed of the sun gear, thereby increasing the rotational speed of the planetary carrier or internal gear, and the brake mechanism exerts a braking function to slow down the rotational speed of the drive shaft.

The third aspect of the present invention is a solar radiation shading device having a drive shaft that rotates forward or backward to raise and lower a shield, a brake mechanism that decelerates the drive shaft, and a planetary gear mechanism that is provided between the drive shaft and the brake mechanism and adjusts the deceleration of the drive shaft by the brake mechanism, in which the planetary gear mechanism comprises a sun gear that is loosely fitted to the drive shaft, an internal gear that is concentric with the sun gear and surrounds the sun gear at a predetermined interval, a plurality of planetary gears that are located between the sun gear and the internal gear and mesh with the sun gear and the internal gear, and a planetary gear mechanism that allows the plurality of planetary gears to rotate on their own axes and The device has a planetary carrier that is held so that it can revolve around the sun gear, and further includes an adjustment mechanism having an elastic member that can be pressed against the planetary carrier in the axial direction of the drive shaft, and the internal gear or sun gear is connected to the drive shaft, and the sun gear or internal gear is connected to a brake mechanism, and the adjustment mechanism adjusts the force with which the elastic member is pressed against the planetary carrier to slow down or stop the rotational speed of the planetary carrier, thereby increasing the rotational speed of the sun gear or internal gear, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft.

The fourth aspect of the present invention is an invention based on any one of the first to third aspects, and is further characterized in that the elastic member 26a is made of an elastically deformable cushion material or a metal spring, as shown in FIG. 1.

The fifth aspect of the present invention is an invention based on the first aspect, and further characterized in that, as shown in Figs. 1, 2 and 5, the brake mechanism 17 is a centrifugal brake mechanism, and the centrifugal brake mechanism 17 has a rotating support 17a integral with the sun gear 21 or the planetary carrier, a plurality of weight members 17b arranged at intervals in the circumferential direction around the rotating support 17a, a plurality of support pins 17c attached to the rotating support 17a and holding the weight members 17b in a swingable manner, a plurality of brake shoes 17d whose base ends are attached to the weight members 17b and whose tips protrude outward from the outer circumferential surfaces of the weight members 17b, and a brake case 17e that surrounds the weight members 17b with gaps and whose inner circumferential surface is pressed against by the brake shoes 17d when the weight members 17b rotate together with the rotating support 17a.

The sixth aspect of the present invention is an invention based on the first aspect, and is further characterized in that, as shown in Figs. 1, 6 and 7, the elastic member 26a is formed in a ring shape surrounding the planetary carrier 23 in the carrier case 24 that houses the planetary carrier 23, and the adjustment mechanism 26 has the elastic member 26a, a female threaded portion 26b formed on the inner peripheral surface of the carrier case 24, a male threaded portion 26c that screws into the female threaded portion 26b, and an operating portion 26d that is integral with the male threaded portion 26c, and is configured such that the pressing force of the elastic member 26a against the internal gear 19 is adjusted by operating the operating portion 26d in the direction of screwing or loosening the male threaded portion 26c into the female threaded portion 26b.

The seventh aspect of the present invention is an invention based on the first aspect, and is further characterized in that, as shown in FIG. 9, the elastic member 26a is formed in a ring shape surrounding the planetary carrier 22 in the carrier case 24 that houses the planetary carrier 22, and the adjustment mechanism 56 has the elastic member 26, the female threaded portion 26b formed on the inner peripheral surface of the carrier case 24, the male threaded portion 26c that screws into the female threaded portion 26b, the driven gear 56a that is integral with the male threaded portion 26c, and the drive gear 56b that meshes with the driven gear 56a, and is configured so that the pressing force of the elastic member 26a against the internal gear 19 is adjusted by rotating the drive gear 56b in the direction in which the male threaded portion 26c is screwed into or loosened from the female threaded portion 26b.

The eighth aspect of the present invention is an invention based on any one of the first to third aspects, further characterized in that, as shown in Figures 10 and 11, the drive shaft is divided into a first drive shaft 71 and a second drive shaft 72, the planetary gear mechanism 18 is housed in a first case 81, the brake mechanism is housed in a second case 82 provided separately from the first case 81, the first drive shaft 71 is inserted into the first case 81 and connected to the planet carrier 23, the internal gear or the sun gear, one end of the second drive shaft 72 is inserted into the first case 81 and connected to the sun gear 21, the planet carrier or the internal gear, and the other end is inserted into the second case 82 and connected to the brake mechanism.

In the solar shading device of the first aspect of the present invention, the adjustment mechanism has an elastic member that can be pressed against the internal gear in the axial direction of the drive shaft, the planetary carrier or sun gear is connected to the drive shaft, and the sun gear or planetary carrier is connected to the brake mechanism. Therefore, the adjustment mechanism adjusts the pressing force of the elastic member against the internal gear to slow down or stop the rotational speed of the internal gear, thereby increasing the rotational speed of the sun gear or planetary carrier, and the braking function of the brake mechanism is exerted to slow down the rotational speed of the drive shaft. As a result, it is possible to prevent the shield from suddenly descending, and the shield can be descended at an optimal speed. Furthermore, even if the weight of the shield is different for models, or even if the sliding resistance between members is different for the same model, the braking force of the brake mechanism can be adjusted to suit the solar shading device.

In the solar shading device of the second aspect of the present invention, the adjustment mechanism has an elastic member that can be pressed against the sun gear in the axial direction of the drive shaft, the internal gear or planetary carrier is connected to the drive shaft, and the planetary carrier or internal gear is connected to the brake mechanism. Therefore, the adjustment mechanism adjusts the force with which the elastic member is pressed against the sun gear to slow down or stop the rotational speed of the sun gear, thereby increasing the rotational speed of the planetary carrier or internal gear, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft. As a result, as with the above, it is possible to prevent the shield from suddenly descending, and to allow the shield to descend at an optimal speed. Furthermore, even if the weight of the shield is different for models, or even if the sliding resistance between members is different for the same model, the braking force of the brake mechanism can be adjusted to suit the solar shading device.

In the solar shading device of the third aspect of the present invention, the adjustment mechanism has an elastic member that can be pressed against the planetary carrier in the axial direction of the drive shaft, the internal gear or sun gear is connected to the drive shaft, and the sun gear or internal gear is connected to the brake mechanism. Therefore, the adjustment mechanism adjusts the pressing force of the elastic member against the planetary carrier to slow down or stop the rotational speed of the planetary carrier, thereby increasing the rotational speed of the sun gear or internal gear, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft. As a result, as with the above, it is possible to prevent the shield from suddenly descending, and to allow the shield to descend at an optimal speed. Furthermore, even if the weight of the shield is different for models, or even if the sliding resistance between members is different for the same model, the braking force of the brake mechanism can be adjusted to suit the solar shading device.

In the solar shading device of the fourth aspect of the present invention, the elastic member is made of an elastically deformable cushion material or metal spring, so that the same effect as above can be achieved by adjusting the pressing force of the cushion material or metal spring against the internal gear, sun gear, or planetary carrier using an adjustment mechanism.

In the solar radiation shading device of the fifth aspect of the present invention, the brake mechanism is a centrifugal brake mechanism, so that by increasing the rotational speed of the sun gear or planetary carrier connected to the brake mechanism, the rotational support member that is integral with the sun gear, etc., also increases in speed, causing the weight member to rotate around the support pin due to centrifugal force and press the brake shoe against the inner surface of the brake case. As a result, the rotational speed of the sun gear, etc., and the rotational speed of the drive shaft also decrease, so that the shield can be lowered at an optimal speed.

In the solar shading device according to the sixth aspect of the present invention, the pressing force of the elastic member against the internal gear can be adjusted from the outside by operating the operating part in the direction of screwing or loosening the male threaded part into the female threaded part. With such a simple operation, the pressing force of the elastic member against the internal gear can be adjusted.

In the solar shading device according to the seventh aspect of the present invention, the pressing force of the elastic member against the internal gear can be adjusted by rotating the drive gear in the direction in which the male threaded portion is screwed into or loosened from the female threaded portion. If the shaft of the drive gear is connected to an operating rod via a universal joint, the pressing force of the elastic member against the internal gear can be adjusted from the outside with a simpler operation.

In the solar shading device of the eighth aspect of the present invention, the drive shaft is divided into a first drive shaft and a second drive shaft, the planetary gear mechanism is housed in a first case, and the brake mechanism is housed in a second case provided separately from the first case. The first drive shaft is inserted into the first case and connected to the planetary carrier, the internal gear, or the sun gear. Furthermore, one end of the second drive shaft is inserted into the first case and connected to the sun gear, the planetary carrier, or the internal gear, and the other end is inserted into the second case and connected to the brake mechanism. Therefore, the planetary gear mechanism and the brake mechanism can be incorporated into any unit, i.e., the planetary gear mechanism and the brake mechanism can be used in many types of solar shading devices.

FIG. 2 is a vertical cross-sectional view showing a brake mechanism and a planetary gear mechanism of the solar radiation shading device according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the brake mechanism and the planetary gear mechanism. 2 is a cross-sectional view taken along line AA in FIG. 1. 2 is a cross-sectional view taken along line BB in FIG. 1. 2A is a cross-sectional view taken along line CC in FIG. 1, showing a state in which the brake shoe is not in contact with the inner surface of the brake case, and FIG. 2B is a cross-sectional view taken along line CC in FIG. 1, showing a state in which the brake shoe is pressed against the inner surface of the brake case. 2 is a cross-sectional view of part D in FIG. 1 showing a procedure for adjusting the pressing force applied to the internal gear of the planetary gear mechanism by an adjustment mechanism. This is a cross-sectional view of part B in Figure 8, showing the procedure for removing the cap attached to the end of the head rail of the solar shading device, adjusting the pressing force on the internal gear of the planetary gear mechanism using the adjustment mechanism, and then attaching the cap to the head rail. FIG. 2 is a front view showing a main part of the solar shading device in section. FIG. 11 is a vertical cross-sectional view showing a brake mechanism and a planetary gear mechanism of a solar radiation shading device according to a second embodiment of the present invention. FIG. 13 is a front view showing a brake mechanism, a planetary gear mechanism, and a take-up drum of a solar shading device according to a third embodiment of the present invention. FIG. 2 is a vertical cross-sectional view showing the planetary gear mechanism.

Next, the embodiment of the present invention will be described with reference to the drawings.

First Embodiment
As shown in Fig. 8, the solar shading device 10 in this embodiment is a Roman shade. The Roman shade 10 includes a head rail 11 attached to the wall of a room via a fixing bracket (not shown), a shielding body 12 whose upper ends are attached to the head rail 11 and has a width substantially equal to the length of the head rail 11, a lifting cord 13 suspended from the head rail 11 so as to be liftable and connected to the shielding body 12, and a winding drum 14 attached to the head rail 11 and winding up the lifting cord 13 so as to be unreelable. As shown in Figs. 1 and 2, the head rail 11 is provided with a drive shaft 16 which rotates forward or backward to lift and lower the shielding body 12 via the lifting cord 13 and the winding drum 14, a brake mechanism 17 which decelerates the drive shaft 16, and a planetary gear mechanism 18 which is provided between the drive shaft 16 and the brake mechanism 17 and adjusts the deceleration of the drive shaft 16 by the brake mechanism 17. 7 and 8, reference numeral 11a denotes caps attached to both ends of the head rail 11.

In this embodiment, the planetary gear mechanism 18 is a planetary type planetary gear mechanism that slows down or stops the rotational speed of the internal gear 19 (FIGS. 1, 2, and 4). The planetary gear mechanism 18 also has a sun gear 21 loosely fitted to the drive shaft 16, the internal gear 19 that is concentric with the sun gear 21 and surrounds the sun gear 21 at a predetermined interval, a plurality of planetary gears 22 that are located between the sun gear 21 and the internal gear 19 and mesh with the sun gear 21 and the internal gear 19, and a planetary carrier 23 that holds the plurality of planetary gears 22 rotatably and revolvably around the sun gear 21. The planetary carrier 23 is rotatably housed in a carrier case 24, and four legs 24a are protruding from the carrier case 24 via a first flange 31 (FIGS. 2 and 4). The sun gear 21 is integral with the rotary support 17a of the brake mechanism 17, which will be described later, and the internal gear 19 is rotatably inserted between the four legs 24a of the carrier case 24 (FIGS. 1 and 2). In this embodiment, there are three planetary gears 22, and these planetary gears 22 are rotatably fitted onto three of the three protruding shafts 23a and three pins 23b that are circumferentially and alternately protruding from the planetary carrier 23 at equal intervals, and then a second flange 32 is attached to the tips of the three protruding shafts 23a and three pins 23b with screws (not shown) (FIGS. 1, 2, and 4). This prevents the planetary gears 22 from coming off the protruding shafts 23a.

On the other hand, in this embodiment, the brake mechanism 17 is a centrifugal brake mechanism (Figs. 1, 2 and 5). The centrifugal brake mechanism 17 includes a rotating support 17a that is integral with the sun gear 21, a plurality of weight members 17b that are arranged at intervals in the circumferential direction around the rotating support 17a, a plurality of support pins 17c that hold the weight members 17b in a swingable manner and are attached to the rotating support 17a, a plurality of brake shoes 17d whose base ends are attached to the weight members 17b and whose tips protrude outward from the outer circumferential surfaces of the weight members 17b, and a brake case 17e that surrounds the weight members 17b with gaps and whose inner circumferential surface is pressed against by the brake shoes 17d when the weight members 17b rotate together with the rotating support 17a. In this embodiment, the number of weight members 17b and brake shoes 17d is four each, and the number of support pins 17c is four (FIGS. 2 and 5). The four support pins 17c are each protruding from the end plate 17f. After the four weight members 17b are fitted to the four support pins 17c so that they can swing, the tips of the four support pins 17c are attached to the third flange 33 that is integral with the rotating support 17a with screws (not shown) (FIGS. 1 and 2). In this way, the four support pins 17c are attached to the rotating support 17a. In addition, a fourth flange 34 is integrally provided on the brake case 17e, and this fourth flange 34 is attached to the tip surfaces of the four legs 24a of the carrier case 24 with screws (not shown) (FIGS. 2 and 5).

On the other hand, the adjustment mechanism 26 further includes an elastic member 26a that can be pressed against the internal gear 19 in the axial direction of the drive shaft 16 (FIGS. 1 and 2). In this embodiment, the elastic member 26a is made of an elastically deformable cushioning material made of synthetic rubber, natural rubber, soft plastic, or the like. The elastic member 26a is formed in a ring shape in the carrier case 24 so as to surround the planetary carrier 23. The adjustment mechanism 26 further includes the elastic member 26a, a female threaded portion 26b formed on the inner peripheral surface of the carrier case 24, a male threaded portion 26c that screws into the female threaded portion 26b, and an operating portion 26d that is integral with the male threaded portion 26c. The operating portion 26d is configured so that the pressing force of the elastic member 26a against the internal gear 19 can be adjusted by operating the operating portion 26d in the direction of screwing or loosening the male threaded portion 26c into the female threaded portion 26b.

On the other hand, the planetary carrier 23 is connected to the drive shaft 16, and the sun gear 21 is connected to the brake mechanism 17 (Figs. 1 and 2). In this embodiment, the planetary carrier 23 is connected to the drive shaft 17 via a one-way clutch 27 (Figs. 1 to 3). The one-way clutch 27 has an inner ring 27a having a hexagonal hole 27b (Figs. 2 and 3) that can be fitted onto the drive shaft 16, a torsion coil spring 27c wound around the inner ring 27a, and the planetary carrier 23 surrounding the torsion coil spring 27c. One end of the torsion coil spring 27c is engaged with the inner ring 27a, and the other end is engaged with the planetary carrier 23. When the drive shaft 16 rotates in one direction, the inner ring 27a rotates in one direction together with the drive shaft 16, and the coil diameter of the torsion coil spring 27c tries to expand, increasing the adhesion of the torsion coil spring 27c to the inner surface of the planet carrier 23, so that the frictional resistance generated between the torsion coil spring 27c and the inner surface of the planet carrier 23 becomes extremely large, causing the planet carrier 23 to rotate together with the drive shaft 16. When the drive shaft 16 rotates in the other direction, the inner ring 27a rotates in one direction together with the drive shaft 16, and the coil diameter of the torsion coil spring 27c tries to contract, decreasing the adhesion of the torsion coil spring 27c to the inner surface of the planet carrier 23, so that the frictional resistance generated between the torsion coil spring 27c and the inner surface of the planet carrier 23 becomes extremely small, causing the planet carrier 23 not to rotate together with the drive shaft 16, i.e., the drive shaft 16 rotates idly. In this embodiment, when the drive shaft 16 rotates in one direction, the planetary carrier 23 rotates with the drive shaft 16, and the shield 12 descends. Furthermore, the sun gear 21 is integral with the rotating support 17a of the brake mechanism 17 and is configured to rotate with the rotating support 17a (Figures 1 and 2).

The adjustment method of the Roman shade 10 configured in this manner using the adjustment mechanism 26 will be described. First, the cap 11a attached to one end of the head rail 11 is removed from the head rail 11 (FIG. 7(b)). Next, the operating part 26d of the adjustment mechanism 26 is manually turned clockwise to screw the male screw part 26c into the female screw part 26b (FIGS. 6(a) and 7(c)), and the tip surface of the male screw part 26c is brought into contact with the elastic member 26a (FIG. 6(b)). Then, the elastic member 26a is pressed against the internal gear 19 in the axial direction of the drive shaft 16 until the male screw part 26c is screwed into the female screw part 26b by a predetermined amount. In this state, the shielding body 12 is lowered. At this time, the elastic member 26a is pressed against the internal gear 19, so that the rotation speed of the internal gear 19 is decelerated or stopped by pressing the elastic member 26a against the internal gear 19, and the rotation speed of the sun gear 21 is increased. When the rotation speed of the sun gear 21 is increased, the brake function of the brake mechanism 17 is exerted. That is, the rotation support 17a, which is integral with the sun gear 21, is accelerated, so that the weight member 17b rotates around the support pin 17c due to centrifugal force, and the brake shoe 17d is pressed against the inner surface of the brake case 17e. As a result, the rotation speed of the sun gear 21 is decelerated, and the rotation speed of the drive shaft 16 is also decelerated, so that the descent speed of the shield 12 is reduced. If the descent speed of the shield 12 is faster than the desired speed, the screwing amount of the male screw portion 26c into the female screw portion 26b is increased, and if the descent speed of the shield 12 is slower than the desired speed, the screwing amount of the male screw portion 26c into the female screw portion 26b is decreased, and the above operation is repeated. Then, when the descent speed of the shield 12 reaches the desired speed, the cap 11a is attached to one end of the head rail 11 (FIG. 7(d)). This makes it possible to prevent the shield 12 from suddenly descending, and to allow the shield 12 to descend at an optimal speed. In addition, the pressing force of the elastic member 26a against the internal gear 19 can be adjusted from the outside by simply removing the cap 11a from the head rail 11. Furthermore, even if the weight of the shield 12 is different for different models, or even if the sliding resistance between members is different for the same model, the braking force of the brake mechanism 17 can be adjusted to match the solar shading device such as the Roman shade 10.

Second Embodiment
9 shows a second embodiment of the present invention. In FIG. 9, the same reference numerals as in FIG. 1 indicate the same parts. In this embodiment, the adjustment mechanism 56 has an elastic member 26a, a female threaded portion 26b formed on the inner peripheral surface of the carrier case 24, a male threaded portion 26c screwed into the female threaded portion 26b, a driven gear 56a integrally provided with the male threaded portion 26c, and a driving gear 56b meshing with the driven gear 56a. In addition, the pressing force of the elastic member 26a against the internal gear 19 is adjusted by rotating the driving gear 54b in a direction in which the male threaded portion 26c is screwed into or loosened from the female threaded portion 26b. Other than the above, the second embodiment is configured the same as the first embodiment.

In a Roman shade configured in this manner, the pressing force of the elastic member 26a against the internal gear 19 can be adjusted from the outside by rotating the drive gear 54b in the direction in which the male threaded portion 26c is screwed into or loosened from the female threaded portion 26b. In addition, if the shaft of the drive gear 54b is connected to an operating rod via a universal joint (not shown), it is not necessary to remove the cap, and the pressing force of the elastic member 26a against the internal gear 19 can be adjusted from the outside with a simpler operation. The adjustment method using the adjustment mechanism other than the above is substantially the same as the adjustment method using the adjustment mechanism in the first embodiment, so repeated explanations will be omitted.

Third Embodiment
10 and 11 show a third embodiment of the present invention. In this embodiment, the drive shaft is divided into a first drive shaft 71 and a second drive shaft 72, the planetary gear mechanism 18 is housed in a first case 81, and the brake mechanism is housed in a second case 82 provided separately from the first case 81. The first drive shaft 71 is inserted into the first case 81 and connected to the planetary carrier 23. In this embodiment, the first drive shaft 71 is connected to the planetary carrier 23 via a one-way clutch 27 (FIG. 11). Furthermore, one end of the second drive shaft 72 is inserted into the first case 81 and connected to a first rotary support 91 provided integrally with the sun gear 21, and the other end is inserted into the second case 82 and connected to a second rotary support (not shown) of the brake mechanism (FIGS. 10 and 11). Other than the above, the configuration is the same as that of the first embodiment.

In a Roman shade configured in this manner, the planetary gear mechanism 18 and the brake mechanism can be incorporated into any unit, i.e., the planetary gear mechanism 18 and the brake mechanism can be used in many types of solar shading devices, including Roman shades. In addition, the adjustment method using the adjustment mechanism 26 is substantially the same as the adjustment method using the adjustment mechanism in the first embodiment, so repeated explanation will be omitted.

In the above first to third embodiments, a Roman shade is used as the sun shading device, but other sun shading devices such as horizontal blinds and pleated screens may also be used. In the above first to third embodiments, an elastically deformable cushioning material is used as the elastic member, but a metal spring may also be used. In the above first to third embodiments, the rotation support of the centrifugal brake mechanism is provided integrally with the sun gear, but the outer rotation support may also be provided integrally with the planetary carrier.

In the first to third embodiments, a centrifugal brake mechanism is used as the brake mechanism, but an oil damper brake mechanism that uses the viscosity of oil to generate a brake force, or a shock absorber brake mechanism that generates a brake force using a shock absorber mechanism may be used. An example of an oil damper may have the following configuration: Oil is filled between the brake case and the rotating support, and a rotor with a substantially oval cross section is fitted to the rotating support. When the rotor rotates due to the rotation of the rotating support, viscous resistance of the oil is generated, thereby exerting a brake function. On the other hand, an example of a shock absorber may have the following configuration: A ring-shaped moving member is housed between the brake case and the rotating support, and the moving member is screwed into the rotating support, and is configured to move in the axial direction as the rotating support rotates. In addition, a fine hole is provided in the moving member, and oil is filled between the brake case and the rotating support. Furthermore, the moving member is configured to be movable in the axial direction relative to the brake case but not rotatable relative to it. When the moving member moves in its axial direction due to the rotation of the rotating support, the oil in the brake case moves from one side of the moving member to the other side through the pores, generating resistance to the oil flow and providing the braking function.

In the first to third embodiments, the planetary carrier is connected to the drive shaft, the sun gear is connected to the brake mechanism, and the adjustment mechanism adjusts the pressing force of the elastic member on the internal gear to slow down or stop the rotational speed of the internal gear, thereby increasing the rotational speed of the sun gear, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft. However, the sun gear may be connected to the drive shaft, the planetary carrier is connected to the brake mechanism, and the adjustment mechanism adjusts the pressing force of the elastic member on the internal gear to slow down or stop the rotational speed of the internal gear, thereby increasing the rotational speed of the planetary carrier, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft.

In the first to third embodiments, the planetary gear mechanism is a planetary type planetary gear mechanism that slows down or stops the rotational speed of the internal gear, but a solar type planetary gear mechanism that slows down or stops the rotational speed of the sun gear, or a star type planetary gear mechanism that slows down or stops the rotational speed of the planet carrier may also be used. The solar type planetary gear mechanism is configured such that the adjustment mechanism has an elastic member that can be pressed against the sun gear in the axial direction of the drive shaft, the internal gear or planet carrier is connected to the drive shaft, and the planet carrier or internal gear is connected to a brake mechanism, and the adjustment mechanism adjusts the force with which the elastic member is pressed against the sun gear to slow down or stop the rotational speed of the sun gear, thereby increasing the rotational speed of the planet carrier or internal gear, and the brake mechanism exerts a braking function to slow down the rotational speed of the drive shaft. In addition, the star-type planetary gear mechanism is configured such that the adjustment mechanism has an elastic member that can be pressed against the planetary carrier in the axial direction of the drive shaft, the internal gear or sun gear is connected to the drive shaft, and the sun gear or internal gear is connected to a brake mechanism, and the adjustment mechanism adjusts the force with which the elastic member is pressed against the planetary carrier to slow down or stop the rotational speed of the planetary carrier, thereby increasing the rotational speed of the sun gear or internal gear, and the brake mechanism exerts its braking function to slow down the rotational speed of the drive shaft.

10. Roman shades (sun shading devices)
REFERENCE SIGNS LIST 12 Shield 16 Drive shaft 17 Brake mechanism 17a Rotation support 17b Weight member 17c Support pin 17d Brake shoe 17e Brake case 18 Planetary gear mechanism 19 Internal gear 21 Sun gear 22 Planetary gear 23 Planet carrier 24 Carrier case 26 Adjustment mechanism 26a Elastic member 26b Female thread portion 26c Male thread portion 26d Operation portion 56a Driven gear 56b Drive gear 71 First drive shaft 72 Second drive shaft 81 First case 82 Second case

Claims (8)

A solar radiation shading device comprising: a drive shaft that rotates forward or backward to raise or lower a shield; a brake mechanism that decelerates the drive shaft; and a planetary gear mechanism that is provided between the drive shaft and the brake mechanism and adjusts the deceleration of the drive shaft by the brake mechanism,
the planetary gear mechanism comprises a sun gear loosely fitted on the drive shaft, an internal gear that is concentric with the sun gear and surrounds the sun gear at a predetermined interval, a plurality of planetary gears that are positioned between the sun gear and the internal gear and mesh with the sun gear and the internal gear, and a planet carrier that holds the plurality of planetary gears rotatably and revolving around the sun gear,
The drive shaft further includes an adjustment mechanism having an elastic member that can be pressed against the internal gear in the axial direction of the drive shaft,
the planet carrier or the sun gear is connected to the drive shaft;
The sun gear or the planet carrier is connected to the brake mechanism,
A solar shading device characterized in that the adjustment mechanism adjusts the pressing force of the elastic member against the internal gear to slow down or stop the rotational speed of the internal gear, thereby increasing the rotational speed of the sun gear or the planetary carrier, and the brake mechanism performs a braking function to slow down the rotational speed of the drive shaft. A solar radiation shading device comprising: a drive shaft that rotates forward or backward to raise or lower a shield; a brake mechanism that decelerates the drive shaft; and a planetary gear mechanism that is provided between the drive shaft and the brake mechanism and adjusts the deceleration of the drive shaft by the brake mechanism,
the planetary gear mechanism comprises a sun gear fitted to the drive shaft, an internal gear that is concentric with the sun gear and surrounds the sun gear at a predetermined interval, a plurality of planetary gears that are located between the sun gear and the internal gear and mesh with the sun gear and the internal gear, and a planet carrier that holds the plurality of planetary gears rotatably and revolving around the sun gear,
an adjustment mechanism having an elastic member that can be pressed against the sun gear in the axial direction of the drive shaft,
The internal gear or the planetary carrier is connected to the drive shaft,
The planetary carrier or the internal gear is connected to the brake mechanism,
a braking mechanism that performs a braking function to decelerate the rotational speed of the drive shaft by adjusting the force with which the elastic member is pressed against the sun gear to slow down or stop the rotational speed of the sun gear, thereby increasing the rotational speed of the planetary carrier or the internal gear. A solar radiation shading device comprising: a drive shaft that rotates forward or backward to raise or lower a shield; a brake mechanism that decelerates the drive shaft; and a planetary gear mechanism that is provided between the drive shaft and the brake mechanism and adjusts the deceleration of the drive shaft by the brake mechanism,
the planetary gear mechanism comprises a sun gear loosely fitted on the drive shaft, an internal gear that is concentric with the sun gear and surrounds the sun gear at a predetermined interval, a plurality of planetary gears that are located between the sun gear and the internal gear and mesh with the sun gear and the internal gear, and a planet carrier that holds the plurality of planetary gears rotatably and revolving around the sun gear,
The planetary carrier is configured to rotate in an axial direction of the drive shaft.
The sun gear or the internal gear is connected to the drive shaft,
The internal gear or the sun gear is connected to the brake mechanism,
A solar shading device characterized in that the adjustment mechanism adjusts the force pressing the elastic member against the planetary carrier to slow down or stop the rotational speed of the planetary carrier, thereby increasing the rotational speed of the internal gear or the sun gear, and the brake mechanism performs a braking function to slow down the rotational speed of the drive shaft. The solar shading device according to any one of claims 1 to 3, wherein the elastic member is made of an elastically deformable cushioning material or a metal spring. The solar radiation shading device according to claim 1, wherein the brake mechanism is a centrifugal brake mechanism, and the centrifugal brake mechanism comprises a rotating support body integral with the sun gear or the planetary carrier, a plurality of weight members arranged at intervals in the circumferential direction around the rotating support body, a plurality of support pins attached to the rotating support body and holding the weight members in a swingable manner, a plurality of brake shoes whose base ends are attached to the plurality of weight members and whose tips protrude outward from the outer circumferential surfaces of the plurality of weight members, and a brake case that surrounds the plurality of weight members with gaps therebetween and in which the plurality of brake shoes are pressed against the inner circumferential surface when the plurality of weight members rotate together with the rotating support body. The elastic member is formed in a ring shape surrounding the planetary carrier in a carrier case that accommodates the planetary carrier,
the adjustment mechanism includes the elastic member, a female screw portion formed on an inner peripheral surface of the carrier case, a male screw portion screwed into the female screw portion, and an operating portion integrally provided with the male screw portion,
2. The solar shading device according to claim 1, wherein the pressing force of the elastic member against the internal gear is adjusted by operating the operating portion in a direction to screw or loosen the male threaded portion into the female threaded portion. The elastic member is formed in a ring shape surrounding the planetary carrier in a carrier case that accommodates the planetary carrier,
the adjustment mechanism includes the elastic member, a female threaded portion formed on an inner peripheral surface of the carrier case, a male threaded portion that screws into the female threaded portion, a driven gear that is integral with the male threaded portion, and a drive gear that meshes with the driven gear,
2. The solar shading device according to claim 1, wherein the pressing force of the elastic member against the internal gear is adjusted by rotating the drive gear in a direction in which the male threaded portion is screwed into or loosened from the female threaded portion. The drive shaft is divided into a first drive shaft and a second drive shaft,
The planetary gear mechanism is housed in a first case,
the brake mechanism is accommodated in a second case provided separately from the first case,
the first drive shaft is inserted into the first case and connected to the planet carrier, the internal gear, or the sun gear;
A solar shading device as described in any one of claims 1 to 3, wherein one end of the second drive shaft is inserted into the first case and connected to the sun gear, the planetary carrier or the internal gear, and the other end is inserted into the second case and connected to the brake mechanism.

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