JP7125856B2 - Braking device and shielding device using the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a braking device and a shielding device using the same, and more particularly to a braking device that can be used to adequately slow down the movement of a lifting cord.

Conventionally, there is a shielding device that raises a shielding material by pulling an elevating cord and lowers the shielding material by its own weight. Some of such shielding devices are provided with a braking device that slows down the movement of the lifting cords, thereby reducing the downward momentum of the shielding member. For example, Patent Literature 1 discloses a braking device that clamps a cord to convert movement of the cord into rotation of a member and applies resistance to the rotation to brake the cord.

JP 2005-30084 A

By the way, the braking device described in Patent Document 1 is configured to be incorporated into the braking device with a cord passed through the braking device. Therefore, once the braking device has been incorporated into the shielding device, in order to replace the parts that make up the braking device in order to adjust the resistance of the resistance applying portion or the defective parts, the cord must be removed from the braking device before the braking device can be removed. Therefore, it is necessary to replace the parts at the same time.

The present invention has been made in view of such circumstances, and the parts constituting the braking device can be easily replaced or adjusted even after the braking device is once incorporated into the shielding device, and the assembly work is easy. A braking device is provided.

According to the present invention, there is provided a braking device for braking the movement of a cord, comprising: a motion converting section for converting the movement of the cord into a rotational motion; a resistance applying section for applying resistance to the rotational motion; the motion converting section; and a case that holds at least part of the resistance applying portion, and the braking device includes any one of the following configurations (1) to (3).
(1) The case has attachment/detachment restricting means, and the attachment/detachment restricting means restricts the cord from falling off from the motion converting section and allows the cord to be removed from the motion converting section. state.
(2) The resistance applying section is provided above the motion converting section, the case includes a top plate above the resistance applying section, and the top plate separates the cord and the motion converting section. configured to be removed without
(3) The cord is configured to be detachable from the side of the cord to the motion converter.

According to the present invention, in the case of the configuration (1) above, since the attachment/detachment restricting means can take a state in which the cord can be taken out from the braking device, the braking device and the cord can be easily separated. , the parts constituting the braking device can be easily replaced or adjusted. Also in the case of the configuration (2) above, since the top plate can be removed without separating the cord and the motion conversion section, the parts constituting the braking device can be easily replaced or adjusted. Furthermore, in the case of the configuration (3) above, since the cord can be attached and detached from the braking device from the side thereof, the braking device and the cord can be separated without pulling out the cord to the end, thereby constituting the braking device. Parts can be easily replaced or adjusted.

Preferably, the motion converter includes a pair of clamping members clamping the cord, and a rotating member, and one of the pair of clamping members is configured to rotate together with the rotating member as the cord moves. and the resistance applying section is configured to apply resistance to the rotating member.

Preferably, the configuration of (1) is provided.

Preferably, the case has the configuration of (1), wherein the case includes a ceiling wall portion covering the upper side of the pair of clamping members, and the ceiling wall portion includes an introduction groove extending in the longitudinal direction.

Preferably, the attachment/detachment restricting means includes a protrusion extending in the longitudinal direction and fitted into the introduction groove.

Preferably, a holding member for holding the pair of clamping members is provided, the holding member has a groove that opens upward and extends in the longitudinal direction, and the cord is held from above. The pair of clamping members clamp the cord as the holding member moves within the case as the cord moves in one direction.

Further, the shielding member is opened and closed by movement of the cord, the head box can be opened in one direction substantially perpendicular to the longitudinal direction of the cord, and the braking device is configured to restrict the attachment and detachment. A shielding device is provided, wherein the means is mounted on the headbox so as to lie on the one side.

Preferably, the configuration of (2) above is provided.

Preferably, the configuration of (2) is provided above, wherein the resistance applying section includes a weight and a weight holder that holds the weight, and the weight holder rotates with the rotation of the rotating member to rotate the weight. and the resistance applying unit is configured to move radially outward by centrifugal force generated by the rotation of the weight and generate the braking force by friction with the inner wall surface of the case. , the braking force is configured to be adjustable according to the number or type of the weights.

The shielding member is opened and closed by movement of the cord, the head box can be opened in one direction substantially perpendicular to the longitudinal direction of the cord, and the braking device provides the resistance. A shielding device is provided, wherein a portion is mounted on the headbox such that the portion is positioned on the one side with respect to the motion converting portion.

Moreover, preferably, the configuration of (3) is provided.

Preferably, the above configuration (3) is provided, and the cord is arranged between the pair of clamping members from the side surface of the cord.

The shielding member is opened and closed by movement of the cord, the headbox can be opened in one direction substantially perpendicular to the longitudinal direction of the cord, and the braking device is attached to the headbox. A shielding device is provided in which the cord can be attached to and detached from the motion converting portion from the side of the cord in an installed state.

It is a front view showing shielding device 1 concerning a 1st embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the external appearance of the braking device 100 which concerns on 1st Embodiment of this invention. Fig. 3 is a perspective view showing a state in which a cover 10C of the braking device 100 of Fig. 2 is removed; FIG. 3 is a perspective view of the cover 10C of the braking device 100 of FIG. 2 as viewed from below; FIG. 3 is a perspective view showing a state in which an upper case 10A is removed from the braking device 100 of FIG. 2; FIG. 3 is a perspective view showing a slider 20 of the braking device 100 of FIG. 2; FIG. 6 is a perspective view showing a state in which a slider 20 is further removed from the state of FIG. 5 of the braking device 100 of FIG. 2; FIG. 3 is a cross-sectional view of the main part when the braking device 100 of FIG. 2 is cut along a plane perpendicular to the lifting cord CD. FIG. 9 is a sectional view taken along line AA of FIG. 8; FIG. 9 is a sectional view taken along line BB of FIG. 8; Fig. 10 is a perspective view showing the appearance of a braking device 100 according to a second embodiment of the present invention; FIG. 12 is a schematic diagram showing a situation when the braking device 100 of FIG. 11 is attached to the headbox 2 of the shielding device; FIG. 12 is a schematic diagram showing how only the lower case 10B is removed from the state where the braking device 100 of FIG. 11 is attached to the head box 2 of the shielding device. FIG. 12 is an explanatory diagram schematically showing a state in which a lower case 10B of the braking device 100 of FIG. 11 is removed; 15A is an explanatory diagram of a braking device 100 according to a modification of the second embodiment of the present invention, and FIG. 15B is an explanatory diagram of a braking device 100 according to another modification of the second embodiment of the present invention. be.

Embodiments of the present invention will be described below with reference to the drawings. Various features shown in the embodiments shown below can be combined with each other. In addition, the invention is established independently for each characteristic item.

1. First Embodiment 1-1 Overall Configuration A horizontal blind, which is a shielding device 1 according to the first embodiment, has a plurality of stages from a head box 2 via a plurality of ladder cords 3, as shown in the front view of FIG. A slat 4 is suspended, and a bottom rail 4 a is suspended from the lower end of the ladder cord 3 . Hereinafter, the slat 4 and the bottom rail 4a are collectively referred to as the shielding member 4 as well. In addition, in FIG. 1 , the front and back direction of the drawing is the front-rear direction, and the left-right direction is the width direction.

A plurality of support members 5 are arranged in the head box 2, and a tilt drum 6 is rotatably supported by the support members. The upper end of the ladder cord 3 is attached to a tilt drum 6 , and a tilt shaft 7 extending in the longitudinal direction of the headbox 2 is inserted into all the tilt drums 6 at the center of the tilt drum 6 . Therefore, when the tilt shaft 7 is rotated, all the tilt drums 6 are rotated, and one of the front and rear warp threads of the ladder cord 3 is pulled up with the rotation of the tilt drum 6, so that each slat 4 and the bottom are pulled up. The rails 4a are angularly adjusted in phase.

A cylindrical operating rod 8 is suspended from one end of the head box 2, and an operating portion 8a is provided at the lower end of the operating rod 8. As shown in FIG. When the operation rod 8 is rotated by gripping the operation portion 8 a , the tilt shaft 7 is rotated via the gear mechanism provided inside the head box 2 . Therefore, each shielding member 4 can be angle-adjusted by rotating the operating rod 8 .

A plurality of (three in FIG. 1) lifting cords CD are suspended from the head box 2, and one end of each lifting cord CD is attached to the bottom rail 4a. The other end of each lifting cord CD is turned and guided into the headbox 2 via a guide member (not shown) provided in the headbox 2, and is mounted inside the headbox 2 with a lock portion 9 and a braking device 100. through the head box 2 end. A plurality of lift cords CD pulled out are passed through a cylindrical operation rod 8, and their ends are connected to a cord equalizer 8b provided below the operation portion 8a. Therefore, when the cord equalizer 8b is pulled downward and the lifting cord CD is pulled out from the head box 2, the bottom rail 4a is lifted, and the slats 4 are sequentially lifted.

The locking portion 9 is used to prevent the shielding member 4 from dropping under its own weight, and in this embodiment, a known heart cam stopper is used. Although detailed description is omitted, this locking portion 9 is unlocked when the cord equalizer 8b is pulled downward from the locked state and released, and the shielding member 4 is lowered. When it is pulled downward, the lifting cord CD is locked to prevent it from dropping under its own weight.

Further, the braking device 100 brakes the movement of the lifting cord CD to reduce the force of the shielding member 4 descending. The braking device 100 will be described in detail below with reference to FIGS. 2 to 10. FIG.

In the following description, directions of arrows shown in FIG. Therefore, the longitudinal direction of the lifting cord CD coincides with the longitudinal direction of the braking device 100 . Further, in the shielding device 1 of FIG. 1, the braking device 100 is arranged so that the left side faces forward and the right side faces rearward.

1-2 Configuration of Braking Device 100 The braking device 100 according to the present embodiment includes a motion converter DT that converts the movement of the lifting cord CD into rotational motion, and a resistance imparting portion RA that imparts rotational resistance to this rotational motion. are connected in a substantially vertical direction.

In this embodiment, as shown in FIG. 8 and the like, the motion converter DT includes a slider 20 as a holding member, a tension transmission roller 30 as a rotating member that is one of the pair of pinching members, and a pair of pinching members. It is composed of an idle roller 40 , a coil spring SP, and a part of the case 10 . 8 and 9, the resistance applying part RA is composed of a carrier 260 with internal teeth, a planetary gear 280, a weight holder 320 with a sun gear, a weight 340, a lower case 10B and a part of the case 10. be done. Each member will be described below.

As shown in FIGS. 2 and 3, the case 10 of this embodiment includes an upper case 10A, a lower case 10B, and a cover 10C as an attachment/detachment restricting means.

The upper case 10A is a box-shaped member having an outer diameter such that two rectangular parallelepipeds, each of which is approximately square in plan view, are stacked, and has a space for accommodating each member therein. Specifically, the upper case 10A includes a top wall portion 11 having a substantially square outer shape, side wall portions 12 extending downward from the front, rear, left, and right ends of the top wall portion 11, and horizontal outward from the lower ends of the side wall portions 12. It has a collar portion 13 extending toward and a skirt portion 14 extending downward from the edge of the collar portion 13 .

As shown in FIG. 3, the ceiling wall portion 11 is formed with a first ceiling wall groove 16 and a second ceiling wall groove 17 penetrating vertically. The first ceiling wall groove 16 and the second ceiling wall groove 17 are each formed obliquely with respect to the longitudinal direction of the lifting cord CD, that is, the front-rear direction. The distance between the first ceiling wall groove 16 and the second ceiling wall groove 17 is made small.

Specifically, the first ceiling wall groove 16 is formed in an arc shape, and the arc of the first ceiling wall groove 16 is concentric with the inner peripheral surface of the carrier 260 with internal teeth shown in FIG. (see FIG. 3). On the other hand, the second ceiling wall groove 17 is formed in a shape that draws a gentle curve, and the front side has a substantially linear shape, and as it goes to the rear, it curves away from the first ceiling wall groove 16 ( See Figure 3). A shaft 31 of a tension transmission roller 30 and a shaft 41 of an idle roller 40, which will be described later, are arranged in the first ceiling wall groove 16 and the second ceiling wall groove 17, respectively.

As shown in FIGS. 2 and 3 , guide grooves 61 that are continuous in the vertical direction are formed at the center positions in the left-right direction of the front-rear surfaces of the side wall portions 12 . The guide groove 61 is a groove for inserting the lifting cords CD in the front-rear direction, and in FIGS. 2 and 3, three lifting cords CD are inserted in the front-rear direction. In addition, an introduction groove 62 extending in the front-rear direction is formed at the central position of the top wall portion 11 in the left-right direction. In this embodiment, the front and rear guide grooves 61 of the side wall portion 12 and the introduction grooves 62 are continuous. Therefore, the lifting cord CD can be introduced (incorporated) into the braking device 100 from above in FIG. In addition, as shown in FIG. 3, an engaging groove 12a for engaging with the cover 10C is formed at the position of the upper end of the lateral surface of the side wall portion 12. As shown in FIG.

As shown in FIG. 3, the collar portion 13 and the skirt portion 14 are formed below the side wall portion 12, and have therein a pinion gear 50, an internal toothed carrier 260, a planetary gear 280, a sun gear-equipped weight holder 320, and a A weight 340 is placed. The inner surface of the hem portion 14 has a substantially cylindrical shape, and a ring-shaped inner peripheral gear 65 (see FIG. 9) that meshes with the planetary gear 280 is formed. Engagement grooves 63 (see FIGS. 2 and 9) for engaging with the lower case 10B are formed at two locations in the left-right direction on the outer surface of the skirt portion 14 in the front-rear direction.

As shown in FIGS. 2, 8 and 10, the lower case 10B constitutes the bottom surface of the braking device 100 and constitutes a housing together with the upper case 10A. As shown in FIG. 10, the lower case 10B has a first lower case groove 18 and a second lower case groove 19 at positions facing the first ceiling wall groove 16 and the second ceiling wall groove 17 of the upper case 10A. . The shapes of the first lower case groove 18 and the second lower case groove 19 correspond to the shapes of the first ceiling wall groove 16 and the second ceiling wall groove 17, respectively. Engagement claws 64 that engage with the engagement grooves 63 of the upper case 10A extend upward from the front-rear end surface of the lower case 10B. In addition, the lower surface of the lower case 10B is provided with a mounting cylinder 15 used when fixing the braking device 100 inside the head box 2 (see FIG. 8).

The cover 10C is provided so as to cover the upper portion of the upper case 10A, particularly the introduction groove 62 of the upper case 10A, as shown in FIGS. The cover 10</b>C includes a top plate portion 71 , a holding portion 72 and a central convex portion 73 .

As shown in FIG. 4, the top plate portion 71 has thin recesses 71a on the left and right sides of the central protrusion 73. When the cover 10C is attached to the upper case 10A, the upper case 10A is The shaft 31 and the shaft 41 protruding from the first ceiling wall groove 16 and the second ceiling wall groove 17 do not interfere with each other (see FIG. 8).

The holding portions 72 extend downward in the front-rear direction from both ends of the top plate portion 71 in the left-right direction. Engagement claws 72a for engaging with the upper case 10A are formed on the inside of the holding portion 72 in the left-right direction at a position facing the side wall portion 12 of the upper case 10A.

The central convex portion 73 extends downward in the front-rear direction from the central portion in the left-right direction of the top plate portion 71 . The width of the central protrusion 73 in the left-right direction is substantially the same as the width of the introduction groove 62 in the left-right direction, or a width slightly narrower than that. As a result, the central projection 73 fits into the introduction groove 62 when the cover 10C is attached to the upper case 10A (see FIG. 2). In this embodiment, the central projection 73 does not protrude to the position where the slider 20 exists, and does not fit into the front and rear ceiling wall grooves 27 of the slider 20 . However, as long as it does not interfere with the movement of the slider 20 in the front-rear direction, the central projection 73 may be configured to fit with the front-rear top wall groove 27 as well.

As shown in FIG. 5, the slider 20 holds the tension transmission roller 30 and the idle roller 40 inside. It is configured to move forward and backward together with the roller 30 and the idle roller 40 . Specifically, the slider 20 has a top wall portion 21, a rear wall portion 22, a front wall portion 24, and a bottom wall portion 23, as shown in FIG.

The ceiling wall portion 21 includes left and right ceiling wall grooves 26 formed in the left-right direction and front and rear ceiling wall grooves 27 formed in the front-rear direction. Here, the left and right ceiling wall grooves 26 and the front and rear ceiling wall grooves 27 intersect at a substantially central portion of the ceiling wall portion 21 . Further, the front and rear ceiling wall grooves 27 are open upward, so that the lifting cord CD can be arranged in the slider 20 from above.

The bottom wall portion 23 includes a pair of left and right bottom wall grooves 28 at positions facing the left and right ceiling wall grooves 26 . The pair of bottom wall grooves 28 extend from the left and right ends of the bottom wall portion 23 toward the center. However, the bottom wall groove 28 on the bottom wall portion 23 side is not continuous in the horizontal direction, and connects the front and rear portions of the slider 20 at the central portion. Then, a shaft 31 and a shaft 41, which will be described later, are slid from the lateral direction outside along the left and right top wall grooves 26 and the pair of left and right bottom wall grooves 28 of the top wall portion 21, thereby sliding the tension transmission roller 30 and the idle roller 40. 20, and in addition, it can be held in a laterally movable manner.

A through hole 25 is formed in each of the front wall portion 24 and the rear wall portion 22 . The through hole 25 penetrates the front wall portion 24 and the rear wall portion 22 in the front-rear direction at substantially the center of the width direction of the front wall portion 24 and the rear wall portion 22, and has a substantially U shape elongated in the vertical direction. It is shaped so that the lifting cords CD of books can be inserted in a vertically aligned state.

Further, the rear wall portion 22 is formed with recesses 29 formed on both sides of the through hole 25 from the outer surface of the rear wall portion 22, and the coil springs SP are arranged in the recesses 29 (see FIG. 5). ). One end of the coil spring SP protrudes from the recess 29 when placed in the recess 29 .

The size of the slider 20 having such a shape in the left-right direction is substantially the same as the width in the left-right direction of the space formed by the ceiling wall portion 11 and the side wall portion 12 of the upper case 10A. Therefore, when the slider 20 is arranged in the space of the upper case 10A, the side surfaces of the top wall portion 21 and the bottom wall portion 23 of the slider 20 come into contact with the inner wall surfaces of the left and right side wall portions 12 of the upper case 10A, thereby displacing the slider. 20 is restricted in movement in the lateral direction with respect to the upper case 10A. In this state, the through hole 25 of the slider 20 is aligned with the guide groove 61 of the upper case 10A in the front-rear direction. Therefore, the lifting cord CD can be inserted into the slider 20 through the introduction groove 62 of the upper case 10A and the front and rear ceiling wall grooves 27 of the slider 20. As shown in FIG.

On the other hand, the size of the slider 20 in the front-rear direction is made smaller than the width of the same space in the front-rear direction. Therefore, when the slider 20 is arranged in the space of the upper case 10A, a gap is generated between the slider 20 and the inner wall surfaces of the front and rear side walls 12 of the upper case 10A, and the slider 20 is positioned relative to the upper case 10A. can move forwards and backwards. With the slider 20 placed in the space of the upper case 10A, the coil spring SP protruding from the recess 29 of the rear side wall 22 of the slider 20 presses the rear inner wall of the side wall 12 of the upper case 10A. Therefore, when the slider 20 is arranged in the space of the upper case 10A, the slider 20 is positioned on the front side and pressed forward within the upper case 10A.

Next, the tension transmission roller 30 and the idle roller 40 will be described with reference to FIGS. 7 and 8. FIG.

The tension transmission roller 30 has a shaft 31 and a cylindrical roller portion 32 covering the outer peripheral surface of the shaft 31 . The roller portion 32 is attached to one end of the shaft 31 , and a pinion gear 50 is inserted into the other end of the shaft 31 . The roller portion 32 is preferably made of an elastic material.

The pinion gear 50 is press-fitted to the shaft 31 and rotates about the shaft 31 together with the tension transmission roller 30 . Further, the pinion gear 50 and the tension transmission roller 30 are spaced apart so that the bottom wall portion 23 of the slider 20 can be interposed therebetween. In the pinion gear 50 of the present embodiment, the first top wall groove 16 of the upper case 10A and the first lower case groove 18 of the lower case 10B are concentric with the center point of the inner peripheral surface of the carrier 260 with internal teeth in plan view. Since it is formed above, it can always keep meshing with the internal gear 261 provided on the carrier 260 with internal teeth.

On the other hand, the idle roller 40 has a shaft 41 parallel to the shaft 31 of the tension transmission roller 30 and a roller portion 42 covering the outer peripheral surface of the shaft 41 . Therefore, the rotation axis of the tension transmission roller 30 and the rotation axis of the idle roller 40 are parallel to each other. In this embodiment, the outer peripheral surface of the roller portion 42 of the idle roller 40 is made of resin and has a higher coefficient of friction than a flat metal surface. Both ends of the shaft 41 are exposed from the roller portion 42 .

The roller portion 32 of the tension transmission roller 30 and the roller portion 42 of the idle roller 40 are held inside the slider 20, and the pinion gear 50 is held outside the slider 20, as shown in FIGS. . That is, when the braking device 100 is assembled, the bottom wall portion 23 of the slider 20 is sandwiched between the roller portion 32 and the pinion gear 50 .

Next, the internally toothed carrier 260 and the planetary gear 280 will be described with reference to FIGS. 7 to 9. FIG. In this embodiment, as shown in FIG. 7, the carrier 260 with internal teeth has a substantially donut shape in plan view. The internally toothed carrier 260 includes a cylindrical portion 264 and a flange 262 projecting radially outwardly from the cylindrical portion 264, as shown in FIG.

An internal gear 261 that meshes with the pinion gear 50 is formed on a radially inner peripheral surface of the cylindrical portion 264 as shown in FIG. 9 . A support shaft 263 projecting downward in the vertical direction is formed on the flange 262 (see FIG. 8). The support shafts 263 are preferably equidistant, and in this embodiment, four support shafts 263 are provided at equal intervals.

A planetary gear 280 is rotatably supported on each of the support shafts 263 . The planetary gear 280 meshes with a sun gear 323, which will be described later, and an inner peripheral gear 65 provided inside the upper case 10A. Then, it is possible to revolve around the central portion of the internal gear 261 . Therefore, when the rotation of the pinion gear 50 is transmitted to the internal gear 261, the carrier 260 with internal teeth rotates, and accordingly, the carrier 260 with internal teeth is rotatably supported by the support shaft 263 provided on the flange 262 of the carrier 260 with internal teeth. By rotating the planetary gear 280 , it is possible to transmit the rotation caused by the pinion gear 50 to the sun gear-equipped weight holder 320 .

Next, the weight holder with sun gear 320 and the weight 340 will be described with reference to FIGS. 8 to 10. FIG. As shown in FIG. 10 , the sun gear-equipped weight holder 320 has a shape in which a plurality (four) of projections 321 protrude outward from the vicinity of the lower end of a ring-shaped ring portion 324 . As shown in FIG. 9, a sun gear 323 that meshes with the planetary gear 280 is provided on the outer peripheral surface of the ring portion 324 so that the rotation axis is oriented substantially perpendicularly to the extending direction of the convex portion 321. . Then, as shown in FIG. 10, a weight 340 is arranged in a space formed by the outer surface of the ring portion 324 and the convex portion 321 to hold the weight 340 . In this embodiment, since there are four protrusions 321, four weights 340 can be held at maximum.

When the pinion gear 50 rotates, the weight 340 moves away from the center of the internal gear 261 (outside in the radial direction) due to the centrifugal force generated, and comes into contact with the inner peripheral wall of the case 10, thereby resisting rotation. It acts as a centrifugal brake to provide resistance. Therefore, the inner peripheral gear 65 of the upper case 10A, the weight holder with sun gear 320 and the weight 340 form the resistance applying portion RA. In this embodiment, a plurality of protrusions 341 are formed on the lower case 10B side of the weight 340 to reduce the frictional resistance between the weight 340 and the lower case 10B (see FIG. 8). The number of weights 340 is arbitrary, but it is preferable that the weights 340 are evenly spaced from the viewpoint of balance during rotation. In this embodiment, as an example, the weights 340 are arranged in two opposing spaces among the four holding spaces.

1-3 Operation of Brake Device 100 Next, the operation of the brake device 100 configured as described above will be described. The braking device 100 of the present embodiment applies a braking force to the forward movement of the lifting cord CD and does not apply a braking force to the rearward movement of the lifting cord CD.

<Steady state>
First, in a state (steady state) in which the lifting cord CD does not move, the slider 20 is pushed forward by the coil spring SP and positioned in front of the upper case 10A. For this reason, the tension transmission roller 30 and the idle roller 40 are also positioned forward, and since the distance between the roller portion 32 and the roller portion 42 is small, they sandwich the lift cord CD.

<Brake state>
Next, when the lifting cord CD moves forward (in one direction along the longitudinal direction) in the steady state described above, the roller portion 32 and the roller portion 42 rotate due to the frictional force generated between the lifting cord CD and the rollers. As the portion 32 rotates, the pinion gear 50 also rotates. At this time, the tension transmission roller 30 (shaft 31) and the idle roller 40 (shaft 41) try to move forward and move closer to each other in the left-right direction, and the clamping force of the lifting cord CD between the roller portions 32 and 42 increases. , the roller portion 32 is reliably rotated according to the movement of the lifting cord CD.

When the roller portion 32 and the pinion gear 50 connected thereto rotate, the pinion gear 50 meshes with the internal gear 261 as shown in FIGS. It rotates, and the planetary gear 280 provided on the carrier 260 with internal teeth also rotates (revolves). Since the planetary gear 280 meshes with the sun gear 323 and the inner peripheral gear 65 fixed by the upper case 10A, the planetary gear 280 rotates in the direction opposite to the direction of revolution. Sun gear 323, which meshes with gear 280, also rotates. As a result, the weight 340 held by the sun gear-equipped weight holder 320 that rotates together with the sun gear 323 also starts to rotate.

Then, the centrifugal force causes the weight 340 to come into contact with the inner peripheral wall of the upper case 10A, thereby generating resistance against rotation. Then, when the moving speed of the lifting cord CD increases, the rotational speed increases, thereby increasing the centrifugal force. As the centrifugal force increases, the weight 340 contacts the inner peripheral wall of the upper case 10A more strongly, increasing the resistance. As a result, the moving speed of the lifting cord CD can be suppressed.

<Non-braking state>
On the other hand, when the lifting cord CD moves backward (in the other direction along the longitudinal direction), the tension transmission roller 30 (shaft 31) and the idle roller 40 (shaft 41) tend to move backward and separate in the horizontal direction. As a result, the clamping force of the rollers 32 and 42 against the lifting cord CD is weakened, the transmission of rotation to the tension transmission roller 30 is suppressed, and the lifting cord CD can be pulled without receiving braking force.

1-4 Assembly of Braking Device 100 and Attachment to Head Box 2 The braking device 100 of this embodiment is assembled by arranging each member on the lower case 10B and covering it with the upper case 10A from above. The upper case 10A and the lower case 10B are fixed by engaging the four engaging grooves 63 of the upper case 10A with the corresponding engaging claws 64 of the lower case 10B (see FIG. 3).

In this embodiment, the braking device 100 is installed in the headbox 2 in this state, that is, without the cover 10C attached. At this time, the lower case 10B is introduced so as to come into contact with the bottom surface of the headbox 2, and the mounting tube 15 of the lower case 10B fits into a concave portion (not shown) formed in the headbox 2 and is positioned. After being installed in the head box 2 , the lifting cord CD is introduced into the motion converting portion DT of the braking device 100 through the introduction groove 62 of the upper case 10A and the front and rear top wall grooves 27 of the slider 20 . More specifically, the lifting cord CD is moved in a direction perpendicular to the longitudinal direction of the cord, so that it is positioned between the tension transmitting roller 30 and the idle roller 40, which are a pair of clamping members. and sandwiched between the tension transmission roller 30 and the idle roller 40 (see FIG. 2). Since the tension transmission roller 30 and the idle roller 40 are pushed toward each other as a result of the slider 20 being pushed forward by the coil spring SP, the lifting cord CD is sandwiched between them. In practice, it is preferable that the shafts 31 and 41 are operated to open the gap between them before the lifting cord CD is passed through.

Finally, the cover 10C is attached to the upper case 10A in the headbox 2, so that the lift cord CD is prevented from coming off, and the assembly of the braking device 100 to the headbox 2 is completed. In order to perform such assembly, it is preferable that the head box 2 can be opened upward, which is one direction substantially perpendicular to the longitudinal direction of the lifting cord CD, or is always open.

When the braking device 100 is installed in the head box 2, the front-rear direction (horizontal direction in the drawing) of the braking device 100 is such that the lifting cord CD is clamped when the shielding member 4 is pulled up by pulling the cord equalizer 8b. When the shielding member 4 is lowered by its own weight by releasing the cord equalizer 8b, the lifting cord CD is clamped. That is, the direction in which the lifting cord CD moves forward in FIG. Further, as shown in FIG. 1, the locking portion 9 is arranged in front of the braking device 100 (on the left side in the drawing).

By assembling the braking device 100 in such a direction, when the cord equalizer 8b is pulled downward to raise the shielding member 4, the tension transmission roller 30 and the idle roller 40 are separated from each other. It can be pulled with resistance. On the other hand, when the lifting cord CD is released while the shielding member 4 is not fully lowered and the lifting cord CD is not locked by the locking portion 9, the shielding member 4 tends to fall freely due to its own weight. However, at this time, the lifting cord CD is pulled forward, and as a result, the braking device 100 applies a braking force to the lifting cord CD, so the lowering speed of the shield member 4 is suppressed. When the shielding member 4, which is vertically suspended by the lifting cord CD, freely falls, the lifting cord CD is lifted at a point where the tension applied to the lifting cord CD and the resistance force of the weight 340 and the inner peripheral wall of the upper case 10A are balanced. The moving speed of the CD becomes substantially constant. Therefore, the braking device 100 enables the shielding member 4 to be lowered slowly, thereby suppressing damage or the like due to excessive lowering speed of the shielding member 4 .

1-5 Functions and Effects The following functions and effects can be obtained by the shielding device 1 according to the first embodiment.
(1) A state in which the braking device 100 has a cover 10C as an attachment/detachment restricting means, and a state in which the lifting cord CD is restricted from falling off from the motion converting portion DT of the braking device 100; It is possible to take a detachable state and a detachable state. Here, when restricting the lifting cord CD from falling off, the central convex portion 73 of the cover 10C fits into the introduction groove 62 of the top wall portion 11 of the upper case 10A. Therefore, during operation of the braking device 100, the lifting cord CD is prevented from falling off from the motion converting portion DT. On the other hand, the braking device 100 and the lifting cord CD can be easily separated only by removing the cover 10C. It is possible to perform maintenance of the braking device 100 and change the braking force. As a method of changing the braking force, for example, changing the number or type of the weights 340 of the resistance applying section RA can be considered. Increasing the number of weights 340 or making each weight 340 heavier increases the braking force, and decreasing the number of weights 340 or making each weight 340 lighter reduces the braking force. In addition, it is possible to retrofit the braking device 100 to the already installed shielding device 1 while the lifting cord CD is still connected. It can be said that such maintenance and retrofitting of the braking device 100 is possible because the braking device 100 is configured so that the lifting cord CD can be attached and detached from the side of the lifting cord CD. In maintenance or retrofitting of the braking device 100, the tilt shaft 7 arranged in the head box 2 may interfere with the work. ), the work can be easily carried out by shifting the tilt shaft 7 . When applying the braking device 100 of the present embodiment to a pleated screen as the shielding device 1 instead of the horizontal blind, the pleated screen does not have the tilt shaft 7, so that the braking device 100 can be installed more easily. be.
(2) Since the slider 20 as a holding member is provided with the front and rear ceiling wall grooves 27 as grooves that open upward and extend in the front-rear direction, the lifting cord CD can be inserted into the slider 20 from above. It can be introduced into the inside and pinched between a pair of holding members (tension transmission roller 30 and idle roller 40).

In addition, this embodiment can also be implemented in the following aspects.
In the above-described embodiment, the resistance applying part RA is arranged below the motion converting part DT. and the motion transforming unit DT are arbitrary. For example, it is possible to arrange the resistance applying section RA and the motion converting section DT two-dimensionally.
- In the above embodiment, the shafts 31, 41 of the tension transmission roller 30 and the idle roller 40, which are a pair of clamping members, are arranged vertically. The present invention can also be applied to the braking device 100 of this type. In this case, it is preferable that the lifting cord CD is horizontally moved and clamped by the clamping member.
In the above-described embodiment, the head box 2 can be opened upward, and the braking device 100 is arranged so that the motion converting portion DT and the cover 10C are opened upward with respect to the resistance applying portion RA. , the lifting cord CD can be easily removed from the motion converter DT. However, the invention is not limited to such a configuration. That is, it can be applied even when the head box 2 of the shielding device 1 is open or can be opened to other than upward (for example, downward). Specifically, by positioning the motion converting portion DT and the cover 10C on the side where the head box 2 can be opened with respect to the resistance applying portion RA, the lifting cord CD can be transferred from the motion converting portion DT as in the above-described embodiment. It becomes possible to remove easily.

2 Second Embodiment Next, a shielding device 1 according to a second embodiment will be described with reference to FIGS. 11 to 14. FIG. The shielding device 1 of the second embodiment differs from the first embodiment only in the shape of the case 10 of the braking device 100, the direction in which the braking device 100 is attached to the head box 2, and the number of weights 340 that can be attached. Therefore, only the differences will be described below.

As shown in FIG. 11, in the braking device 100 of the shielding device 1 according to this embodiment, the case 10 is composed of an upper case 10A and a lower case 10B, and the cover 10C is not provided. Further, the upper case 10A is not provided with an introduction groove for passing the lifting cord CD, and the slider 20 is not provided with front and rear ceiling wall portions. That is, in the present embodiment, the lifting cord CD is passed from the guide groove 61 to the motion converting portion DT of the braking device 100 , specifically between the tension transmission roller 30 and the idle roller 40 . Therefore, once the lifting cord CD is passed through the braking device 100, the braking device 100 and the lifting cord CD cannot be easily separated.

However, in the shielding device 1 of this embodiment, as shown in FIG. 12, the braking device 100 is assembled to the headbox 2 in the opposite direction to that of the first embodiment. That is, in this embodiment, the motion converter DT is arranged on the lower side, the resistance applying section RA is arranged on the upper side, the upper case 10A is arranged on the lower side, and the lower case 10B is arranged on the upper side. At this time, the cylindrical projecting portion 66 projecting outward from the top wall portion 11 of the upper case 10A of the braking device 100 is fitted into the mounting groove 2a formed in the head box 2, so that the braking device 100 is positioned.

Further, in the braking device 100 of the present embodiment, as shown in FIG. 14, the weight holder 320 with sun gear has eight convex portions 321 and eight weights 340 are attached. 14, illustration of members inside the weight holder with sun gear 320 is omitted.

Since the braking device 100 of this embodiment is assembled to the headbox 2 in this manner, as shown in FIG. is possible. Therefore, in the braking device 100 of the present embodiment, by removing the lower case 10B while the upper case 10A is fixed to the head box 2, the weight 340 is exposed as shown in FIG. 340 can be changed.

Also in the case of this embodiment, there is a possibility that the tilt shaft 7 arranged in the head box 2 interferes during work, but the tilt shaft 7 can be easily displaced in the axial direction (longitudinal direction of the head box 2). Therefore, by shifting the tilt shaft 7, the work can be easily performed. Also, when the braking device 100 of the present embodiment is applied to a pleated screen without the tilt shaft 7 instead of the horizontal blind, the braking device 100 can be installed more easily.

In addition, this embodiment can also be implemented in the following aspects.
In the above-described second embodiment, as shown in FIG. 12, the head box 2 is configured such that the upper side is open, and the braking device 100 is arranged so that the upper case 10A is on the lower side and the lower case 10B is on the upper side. was However, the headbox 2 of the shielding device 1 may be configured to open in directions other than upward or to be openable in directions other than upward. In this case, by arranging the lower case 10B on the open side with respect to the upper case 10A, the lower case 10B can be removed to easily change the number of weights 340 of the resistance applying portion RA, etc., as in the above embodiment. It becomes possible to
- In the second embodiment, the lower case 10B is vertically moved relative to the upper case 10A, so that attachment and detachment are performed by engaging 64 and 63 (see FIG. 14). . However, as shown in FIG. 15A, the lower case 10B can also be configured to be attached to the upper case 10A by sliding in the front-rear direction. In this case, in order to hold the lower case 10B, the upper case 10A is preferably provided with holding claws 67 (for example, four) at the ends in the left-right direction. With such a configuration, even when the tilt shaft 7 is arranged in the head box 2, the lower case 10B can be easily removed. In this configuration, the lower case 10B does not have the first lower case groove 18 and the second lower case groove 19 (see FIG. 14), and the shaft 31 of the tension transmission roller 30 and the shaft 41 of the idle roller 40 are not formed. , the lateral movement is restricted only by the first ceiling wall groove 16 and the second ceiling wall groove 17 of the upper case 10A. Therefore, in this case, it is preferable to make the ceiling wall portion 11 of the upper case 10A thicker than in the above embodiment. Further, as shown in FIG. 15B, instead of forming a groove in the lower case 10B, a first restricting wall 68 and a A second restricting wall 69 may be provided to restrict the lateral movement of the shaft 41 to the outside. With this configuration, it is possible to attach the lower case 10B to the upper case 10A by sliding and to suitably restrict the movement of the shafts 31 and 41 in the horizontal direction.

Moreover, the present invention can also be implemented in the following aspects.
- In the above-described first and second embodiments, the horizontal blind was used as the shielding device 1, but the shielding device 1 of the present invention may have a configuration different from that of the above-described embodiment. For example, the shielding device 1 of the present invention may be a pleated curtain, a Roman shade, or a roll curtain around which curtain cloth is wound.

The present invention is not limited to the above-described embodiments, and various modifications and changes are possible within the scope of the gist of the invention.

1: Shielding Device, 2: Head Box, 2a: Mounting Groove, 3: Ladder Cord, 4: Shielding Member (Slat), 4a: Bottom Rail, 5: Supporting Member, 6: Tilt Drum, 7: Tilt Axis, 8: Operation rod 8a: operation part 8b: code equalizer 9: lock part 10: case 10A: upper case 10B: lower case 10C: cover (removal restricting means) 11: top wall part 12: side wall Part 12a: Engaging groove 13: Collar part 14: Bottom part 15: Mounting tube 16: First top wall groove 17: Second top wall groove 18: First lower case groove 19: Third 2 lower case groove, 20: slider (holding member), 21: top wall portion, 22: rear side wall portion, 23: bottom wall portion, 24: front side wall portion, 25: through hole, 26: left and right ceiling wall grooves, 27 : top wall groove, 28: bottom wall groove, 29: concave portion, 30: tension transmission roller (rotating member), 31: shaft, 32: roller portion, 40: idle roller, 41: shaft, 42: roller portion, 50: Pinion gear, 61: guide groove, 62: introduction groove, 63: engagement groove, 64: engagement claw, 65: inner peripheral gear, 66: protrusion, 67: holding claw, 68: first regulation wall, 69: Second regulating wall 71: top plate portion 71a: concave portion 72: holding portion 72a: engaging claw 73: central convex portion 100: braking device 260: carrier with internal teeth 261: internal gear 262 : flange, 263: support shaft, 264: cylindrical portion, 280: planetary gear, 320: weight holder with sun gear, 321: convex portion, 323: sun gear, 324: ring portion, 340: weight, 341: projection, CD : Lifting code, DT: motion converter, RA: resistance applying part, SP: coil spring

Claims (5)

A braking device that brakes the movement of the cord while allowing the movement of the cord,
a motion converting portion that converts the movement of the cord into rotational motion; a resistance applying portion that applies resistance to the rotational motion; and a case that holds at least part of the motion converting portion and the resistance applying portion,
The motion conversion unit includes a pair of clamping members that clamp the cord,
one of the pair of clamping members is configured to rotate as the cord moves,
The resistance applying unit is configured to apply resistance to one of the pair of clamping members,
The case has attachment/detachment restricting means, and the attachment/detachment restricting means has a state in which the cord is restricted from falling off from the motion conversion section and a state in which the cord can be removed from the motion conversion section. A braking device, configured to take. A braking device according to claim 1 ,
the case includes a top wall portion that covers the upper side of the pair of clamping members,
A braking device, wherein the top wall portion includes an introduction groove extending in a longitudinal direction of the cord . A braking device according to claim 2 ,
The braking device, wherein the attachment/detachment restricting means includes a projection extending in the longitudinal direction and fitted with the introduction groove. The braking device according to claim 2 or 3,
A holding member that holds the pair of pinching members is provided,
The holding member has a groove that opens upward and extends in the longitudinal direction so that the cord can be arranged from above,
A braking device configured such that the pair of clamping members clamp the cord by the holding member moving within the case as the cord moves in one direction. A shielding device comprising a head box, a shielding member, the cord, and the braking device according to any one of claims 1 to 4 , wherein the shielding member is opened and closed by movement of the cord. configured,
The headbox can be opened in one direction substantially perpendicular to the longitudinal direction of the cord,
The braking device is a shielding device installed in the head box so that the attachment/detachment restricting means is located on the one direction side.

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