JP6441164B2 - Solar radiation shielding device speed adjustment device - Google Patents

Description

  The present invention relates to a speed adjusting device used in a solar radiation shielding device that lowers a weight of a shielding material such as a horizontal blind, a raised curtain, and a pleated screen.

  For example, Patent Document 1 discloses a solar shading device of a type that rewinds a lifting cord wound around a winding shaft by lowering the bottom rail by its own weight. This solar radiation shielding device includes a speed adjusting device for adjusting the descending speed of the bottom rail.

  The speed adjusting device is a so-called centrifugal governor, and can be slidably contacted with a rotating member that expands in the outer peripheral direction in accordance with the rotation speed of the take-up shaft (elevating shaft) and a rotating member that is arranged around the rotating member and expands. A sliding contact case. The rotating member is formed of a substantially inverted S-shaped rubber plate, and includes a rotation center shaft portion having a hole as a center, two arm portions extending from the outer periphery of the rotation center shaft portion, and the arm portion. And a weight portion formed continuously at each tip portion. When the rotating member rotates, the weight portion expands together with the arm portion in the outer peripheral direction by centrifugal force, and when the rotation stops, the rotating member returns to the original state by the elastic force. Patent Document 2 also discloses a similar speed adjustment device.

The arm portion of the rotating member described in Patent Document 1 includes a first arm portion extending radially outward from the rotation center portion, a second arm portion extending rearward in the rotation direction from the tip of the first arm portion, have. The rotating member is attached to a worm shaft which is a rotating shaft through a loading member (mounting member) called a bed. The mounting member has a disk part extending along the rotating member and a guide protrusion protruding from the disk part. The guide protrusion sandwiches the first arm portion from both sides and restricts the movement of the first arm portion in the rotation axis direction by a claw portion provided at the tip.
Note that the speed adjusting device of Patent Document 2 does not include a mounting member, and the rotating member is directly attached to the worm shaft.

Japanese Patent No. 3485164 (paragraph 0089, FIG. 10) JP 2013-72183 A (FIG. 1)

  However, in the speed adjustment device described in Patent Document 1, the first arm portion is less likely to be deformed than the second arm portion because the first arm portion is sandwiched between the guide protrusions. For this reason, when the rotating member rotates, only the tip of the second arm portion expands and vibrates finely, which may generate noise. Further, since the first arm portion is also somewhat deformed, noise may be generated when the first arm portion vibrates and contacts (collides) with the guide protrusion. Therefore, there has been a demand for the development of a speed adjusting device that is quieter than before.

  This invention solves an above-described problem and makes it a subject to provide the speed adjustment apparatus of the solar radiation shielding apparatus with a quieter sound higher than before.

  In order to solve the above-described problems, the present invention provides a shaft serving as a rotating shaft, a rotating member that rotates while being elastically deformed so as to expand according to the rotation speed of the shaft, and the rotating member is mounted on the shaft. A speed adjusting device for a solar radiation shielding device, comprising: a mounting member for mounting; and a sliding contact member that is installed on a radially outer side of the rotating member and is in sliding contact with the expanded rotating member, wherein the rotating member is A cylindrical portion having an axial hole; an arm portion extending radially outward from the cylindrical portion; and a weight portion provided at a tip of the arm portion, and the mounting member is A main body portion inserted into the axial hole of the cylindrical portion, a shaft mounting hole provided at the center of the main body portion, and locked to the cylindrical portion to restrict axial movement of the cylindrical portion. A slide restricting portion, and the arm portion is against the mounting member. Characterized in that in a non-contact state.

  According to such a configuration, the mounting member has the slide restricting portion that restricts the movement of the tubular portion in the axial direction by being engaged with the tubular portion of the rotating member. Absent. Further, since the arm portion of the rotating member is in a non-contact state with respect to the mounting member, the degree of freedom of the arm portion is improved and noise due to slight vibration of the arm portion can be reduced. Moreover, generation of noise due to contact between the arm portion and the mounting member can be prevented. Therefore, unlike the prior art (Patent Document 1), it is not necessary to provide the guide protrusion and the claw portion on the loading member, and it is possible to improve the silence while simplifying the parts.

  Moreover, it is preferable that the said slide control part is a cyclic | annular concave groove part formed in the outer peripheral surface of the said main-body part, and the said cylindrical part is fitting to the said concave groove part.

  According to such a configuration, the end portion of the cylindrical portion abuts against the side wall of the concave groove portion, so that the movement of the cylindrical portion (and thus the rotating member) in the axial direction is restricted. Therefore, unlike the prior art (Patent Document 1), it is not necessary to provide the guide protrusion and the claw portion on the loading member, and it is possible to improve the silence while simplifying the parts.

  Moreover, it is preferable that the shaft and the mounting member have a first rotation restricting portion that restricts relative rotation of each other.

  According to such a configuration, since the relative rotation of the shaft and the mounting member is restricted by the first rotation restricting portion, non-rotation of the rotating member due to idling of the shaft can be prevented.

  The first rotation restricting portion includes a first noncircular portion that is formed in a non-circular shape in the shaft and the shaft mounting hole in a cross-sectional view in a direction orthogonal to the rotation axis and engages with each other so as not to rotate relative to each other. Is preferable.

  According to such a configuration, the non-rotation of the rotating member due to the idling of the shaft can be easily prevented by engaging the first non-circular portion formed in the shaft and the shaft mounting hole with each other so as not to rotate. .

  Moreover, it is preferable that the mounting member and the rotating member have a second rotation restricting portion that restricts relative rotation of each other.

  According to such a configuration, since the relative rotation between the mounting member and the rotating member is restricted by the second rotation restricting portion, non-rotation of the rotating member due to idling of the mounting member can be prevented.

  Further, the second rotation restricting portion is formed in a non-circular shape on the outer peripheral surface of the main body portion and the shaft hole in a cross-sectional view in a direction orthogonal to the rotation axis, and engages with each other so as not to be relatively rotatable. It is preferable to have a configuration consisting of

  According to such a configuration, the non-rotation of the rotating member due to the idling of the mounting member is facilitated by engaging the second non-circular portion formed on the outer peripheral surface of the main body portion and the shaft hole with each other in a non-rotatable manner. Can be prevented.

  The distance between the sliding contact member and the weight portion is such that when the shielding material of the solar radiation shielding device is lowered to a predetermined lowering position higher than the maximum lowering position of the shielding material, the weight portion is the sliding contact member. It is preferable that the distance is set so as to be separated from the distance.

  According to such a configuration, when the shielding material of the solar shading device is lowered to a predetermined lowering position higher than the maximum lowering position of the shielding material, the weight portion is separated from the sliding contact member and the braking force is zero. become. Therefore, it can be suppressed that the shielding material stops when the shielding material further descends from the predetermined lowering position. Thereby, the shielding material can be smoothly lowered to the maximum lowering position.

  The arm portion includes a first arm portion extending radially outward from the tubular portion, and a second arm portion extending toward the rear side in the rotational direction from the tip of the first arm portion. The weight portion is provided at a tip end of the second arm portion, and an axis passing through the center position in the width direction of the first arm portion is an imaginary line passing through the center of rotation and parallel to the axis. It is preferable to adopt a configuration that is shifted to the front in the rotational direction.

  According to such a configuration, by providing the first arm portion so that the axis passing through the center position in the width direction of the first arm portion is shifted forward in the rotation direction with respect to the virtual line passing through the rotation center and parallel to the axis line. For example, it is possible to suppress vibration noise while increasing the braking force by extending the second arm portion.

  Moreover, it is preferable that the thickness of the arm portion in the rotation axis direction is larger than the width of the arm portion in the rotation direction.

  According to such a configuration, since the thickness of the arm portion in the rotation axis direction is larger than the width of the arm portion in the rotation direction, the rigidity of the arm portion in the rotation axis direction is increased. Therefore, since the deformation of the arm portion in the rotation axis direction is suppressed, the guide protrusion and the disk portion provided on the conventional loading member can be omitted.

  In the speed adjusting device of the present invention and the solar radiation shielding device including the speed adjusting device, it is possible to improve the quietness as compared with the related art.

It is the front view which showed the solar radiation shielding apparatus provided with the speed adjustment apparatus which concerns on embodiment of this invention. It is the side view which looked at the inside of the speed adjusting device from the axial direction of the rotating shaft. It is explanatory drawing of a rotating member, (a) is the front view seen from the rotating shaft direction of the rotating member, (b) is a perspective view. It is explanatory drawing of the member for mounting | wearing, (a) is a side view, (b) is bb arrow sectional drawing of (a), (c) is the cc arrow rear view from (a), (d ) Is a cross-sectional view taken along line dd in (c). It is explanatory drawing of a worm shaft, (a) is a side view, (b) is bb arrow sectional drawing of (a). It is explanatory drawing of a sliding contact member, (a) is the front view seen from the rotating shaft direction of the rotation member, (b) is IVb-IVb arrow sectional drawing shown to (a), (c) is a top view, is there.

  A speed adjusting device (hereinafter simply referred to as “speed adjusting device”) of a solar radiation shielding device according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In this embodiment, a case where the speed adjusting device of the present invention is applied to a horizontal blind will be described as an example. In the following description, “up / down / left / right” coincides with up / down / left / right in FIG. 1, and the front side in FIG. 1 is described as “front” and the back side is described as “rear”.

  As shown in FIG. 1, a horizontal blind 1 which is a solar shading device includes a head box 2 fixed to a window frame, an endless operation cord 3 suspended from a side end of the head box 2, and a head box. 2 and a ladder cord 5 suspended from the head box 2.

  Further, the horizontal blind 1 includes a bottom rail 6 attached to the lower end of the lifting / lowering cord 4 and a plurality of slats 7 (shielding materials) supported by the ladder cord 5.

  The ladder cord 5 is disposed in a pair of front and rear sides on the indoor side and the outdoor side. A plurality of slats 7 are supported at equal intervals in the vertical direction between the front and rear ladder cords 5 and 5.

  The head box 2 is a box-shaped member for accommodating various devices. In the head box 2, an elevating device 10 for elevating and lowering the bottom rail 6 and each slat 7, a slat driving device 20 for tilting each slat 7, and a lowering speed of the bottom rail 6 and each slat 7 are adjusted. And a speed adjusting device 30 are mainly accommodated. The head box 2 is fitted to a long box main body 2a formed in a groove shape having an upper opening in a cross-sectional view, a lid member 2b for closing the upper opening of the box main body 2a, and a right end portion of the box main body 2a. It has the cap member 2c and the cap member 90 fitted to the left end part of the box main body 2a.

The lifting device 10 includes a pulley 11, a clutch mechanism 12 connected to the pulley 11, a drive shaft 13 connected to the clutch mechanism 12, a take-up shaft 14 connected to the drive shaft 13, and a take-up shaft 14. And a bearing member 15 that is rotatably supported.
The pulley 11 is accommodated in the side end portion of the head box 2, and the upper end portion of the operation cord 3 is hung on the pulley 11.

The clutch mechanism 12 connects or disconnects the pulley 11 and the drive shaft 13. A bearing member 15 is disposed on one side of the clutch mechanism 12 (left side in FIG. 1).
The bearing member 15 has a bottom plate portion and two left and right side walls erected on the bottom plate portion, and is a holder that rotatably supports the winding shaft 14.

Further, in the bottom plate portion of the bearing member 15, a hole portion that guides the lifting / lowering cord 4 and the ladder cord 5 to hang in the vertical direction is formed at the right end portion in FIG. 1.
The winding shaft 14 is a cylindrical member, and both ends of the winding shaft 14 are rotatably supported on both side walls of the bearing member 15.

A drive shaft 13 is inserted into the take-up shaft 14, and the drive shaft 13 and the take-up shaft 14 are engaged so that the take-up shaft 14 rotates in conjunction with the drive shaft 13. An upper end portion of the lifting / lowering cord 4 is fixed to the winding shaft 14.
In the lifting device 10, when the pulley 11 is rotated by rotating the operation cord 3, the drive shaft 13 and the winding shaft 14 are rotated via the clutch mechanism 12.

  The bottom rail 6 is lifted by winding the lifting / lowering cord 4 around the winding shaft 14, and each slat 7 is lifted by sequentially lifting each slat 7 from the lower slat 7 by the bottom rail 6. it can.

  Further, when the lifting / lowering cord 4 wound around the winding shaft 14 is rewound and the bottom rail 6 is lowered, the ladder cord 5 sequentially supports the slats 7 from the upper slats 7 so that each slat 7 is developed.

  When the bottom rail 6 is lowered, the bottom rail 6 can be lowered by its own weight by separating the pulley 11 and the drive shaft 13 by the clutch mechanism 12.

  Housed in the head box 2 is a speed adjusting device 30 that adjusts the lowering speed of the bottom rail 6 by applying a braking force to the winding shaft 14 when the bottom rail 6 is lowered by its own weight. . The speed adjusting device 30 will be described in detail later.

  Also, in the head box 2, there is an obstacle detection stop device (not shown) that stops the rotation of the winding shaft 14 and stops the bottom rail 6 when the bottom rail 6 comes into contact with the obstacle when descending. Is provided. In the present embodiment, the obstacle detection and stop device is installed inside the left end portion of the winding shaft 14.

  When the bottom rail 6 comes into contact with the obstacle when the bottom rail 6 is lowered, and the tension of the lifting / lowering cord 4 is reduced, the stopper projects from the end of the winding shaft 14 and the stopper engages with the bearing member 15. Thereby, it is comprised so that rotation of the winding shaft 14 may stop.

The slat drive device 20 includes a tilt shaft 21 and a tilt drum 22 connected to the tilt shaft 21.
The tilt shaft 21 is connected to the pulley 11 via a gear mechanism, and is configured to rotate in conjunction with the pulley 11.
The tilt drum 22 is a cylindrical member interposed between the end of the winding shaft 14 and the side wall of the bearing member 15.

The tilt drum 22 includes an outer cylinder part, an inner cylinder part, and a tilt spring wound around the inner cylinder part. A tilt shaft 21 is connected to the inner cylinder portion via a gear mechanism, and the inner cylinder portion rotates in conjunction with the tilt shaft 21. Two outer and rear ladders are provided on the outer peripheral surface of the outer cylinder portion of the tilt drum 22. The upper ends of the cords 5 and 5 are fixed.

  When the operation cord 3 is rotated and the pulley 11 is rotated in a state where each slat 7 is horizontal, the drive shaft 13 and the tilt shaft 21 are rotated. In the slat drive device 20, the outer cylinder portion of the tilt drum 22 rotates in conjunction with the tilt shaft 21, so that one of the front and rear ladder cords 5, 5 is lowered and the other is raised. As a result, the slats 7 supported between the front and back ladder cords 5 and 5 are raised, and the space between the slats 7 is shielded.

  Next, the configuration of the speed adjusting device 30 will be described in detail with reference to FIGS.

  As shown in FIG. 2, the speed adjustment device 30 is a device that adjusts the lowering speed of the bottom rail 6. The speed adjustment device 30 includes an input shaft 31 for inputting the rotation of the drive shaft 13, a speed increasing wheel train 40 that transmits the rotation input to the input shaft 31 at an increased speed, a centrifugal governor 50, and these And a resin case member 34 for incorporating the member.

  The centrifugal governor 50 rotates as the final stage of the speed increasing wheel train 40 and expands in the outer circumferential direction according to the rotation speed, and is fitted inside the case member 34 and is surrounded by the rotation member 60. Slidable contact member 70 that is slidably contacted with rotating member 60 that is arranged and expanded with a predetermined clearance. The case member 34 includes a box-shaped case main body 34a and a case lid 34b (see FIG. 1). Between the case member 34 and the head box 2, a vibration suppressing member 80 (see FIG. 1) formed of an elastic member such as rubber is installed.

  The input shaft 31 has a hollow hollow shaft portion 31a having a rectangular insertion port 36 for inserting the tip of the drive shaft 13, and an input gear 31b formed integrally with the hollow shaft portion 31a. doing. The input shaft 31 is rotatably supported at both ends by a bearing portion (not shown) formed on the case member 34.

  The speed increasing wheel train 40 includes an input gear 31b, a pinion 41 that engages with the input gear 31b, a worm wheel 42 that is disposed coaxially with the pinion 41, and a worm shaft that serves as a rotating shaft that engages with the worm wheel 42. 120 and a rotating member 60 disposed coaxially with the worm shaft 120. The pinion 41 and the worm wheel 42 are rotatably supported by a bearing portion (not shown) formed on the case member 34 in a state where the rotation axis direction is directed in the left-right direction. The worm shaft 120 is supported on one end side by a bearing portion 34c formed on the case member 34 with the rotation axis direction directed in the front-rear direction, and on the other end on a bearing portion 71a formed on a sliding contact member 70 described later. Has been supported by the side.

  An attachment member 110 for attaching the rotating member 60 to the worm shaft 120 is provided on the other end side of the worm shaft 120. The mounting member 110 is fixed to the worm shaft 120 by press fitting or the like, and rotates integrally with the rotating member 60. Further, between the pinion 41 and the worm wheel 42, a one-way rotating means (not shown) for transmitting only the rotation of the drive shaft 13 in the rewinding direction to the worm wheel 42 is interposed.

  When the input gear 31b of the input shaft 31 rotates, the speed increasing wheel train 40 receives the rotation of the input gear 31b to rotate the pinion 41, and the rotation of the pinion 41 is transmitted to the worm wheel 42 and the worm shaft 120. Thus, the rotating member 60 is rotated. The speed increasing wheel train 40 uses a combination of the worm wheel 42 and the worm shaft 120 to increase the speed increasing ratio to, for example, 1:70.

  A rotating member 60 is installed inside the sliding contact member 70 on the other end side of the worm shaft 120. The rotating member 60 is a member that rotates while elastically deforming so as to expand in accordance with the rotational speed of the drive shaft 13. As shown in FIG. 3A, the rotating member 60 includes a cylindrical portion 61 including the rotation center O, a first arm portion 62 extending radially outward from the cylindrical portion 61, and a first arm. A second arm portion 63 extending from the tip of the portion 62 toward the rear side in the rotational direction and a weight portion 64 provided at the tip of the second arm portion 63 are provided. In the present embodiment, the first arm portion 62 and the second arm portion 63 may be collectively referred to as “arm portion”. The rotating member 60 is integrally formed of an elastic member such as rubber. The rotating member 60 rotates counterclockwise in FIG. 3A (see arrow Y). The rotating member 60 is not in contact with the inner peripheral surface of the sliding contact member 70 in the non-rotating state.

  The cylindrical part 61 is a cylindrical part connected to the other end side of the worm shaft 120 via the mounting member 110. The cylindrical portion 61 has a shaft hole 61a for inserting the mounting member 110. The center of the shaft hole 61a coincides with the rotation center O of the worm shaft 120 serving as a rotation axis. Two flat surfaces 61b are formed on the inner peripheral surface of the shaft hole 61a. That is, the inner peripheral surface of the shaft hole 61a is formed in a non-circular shape, and is formed in a so-called oval shape.

  The first arm portion 62 is a columnar portion that extends linearly from the outer peripheral surface of the tubular portion 61. In the present embodiment, the four first arm portions 62 are provided at equal intervals (intervals of 90 degrees). The axis line CL1 passing through the center position in the width direction of the first arm portion 62 is shifted from the virtual line D1 passing through the rotation center O and parallel to the axis line CL1 to the front side in the rotation direction. In the present embodiment, the side surface on the rear side in the rotation direction of the first arm portion 62 substantially coincides with the virtual line D1.

  The second arm portion 63 is an arc-shaped portion extending from the tip end of each first arm portion 62 toward the rear side in the rotation direction. A weight portion 64 is provided at the tip of each second arm portion 63. The weight part 64 is formed wider than the second arm part 63. The outer peripheral surface of the weight portion 64 is flush with the outer peripheral surface of the second arm portion 63.

  When the rotating member 60 rotates, the second arm part 63 and the weight part 64 are elastically deformed so as to expand radially outward by centrifugal force. Thereby, the outer peripheral surface of the 2nd arm part 63 and the weight part 64 is slidably contacted with the inner peripheral surface of the slidable contact member 70, and braking force generate | occur | produces by friction of both.

  The length L2 of the second arm part 63 is larger than the width W1 of the first arm part 62. Further, the thickness T1 of the rotating member 60 (that is, the thickness T1 of the first arm portion 62 and the second arm portion 63 in the rotation axis direction) is larger than the width W1 of the first arm portion 62 in the rotation direction (see FIG. 3 (b)). Here, the length L <b> 2 of the second arm portion 63 refers to a dimension from the side surface on the rear side in the rotation direction of the first arm portion 62 to the weight portion 64. Further, the width W <b> 1 of the first arm portion 62 refers to a dimension from the side surface on the front side in the rotation direction of the first arm portion 62 to the side surface on the rear side in the rotation direction of the first arm portion 62.

  As shown in FIG. 4, the mounting member 110 is a member for mounting the rotating member 60 to the worm shaft 120. The mounting member 110 is interposed between the worm shaft 120 and the rotating member 60. The mounting member 110 includes a main body 111 inserted into the shaft hole 61 a of the cylindrical portion 61, a shaft attachment hole 112 provided at the center of the main body 111, and the cylindrical portion 61. And a groove portion 113 as a slide restricting portion for restricting the movement of 61 in the axial direction. The mounting member 110 does not have a guide protrusion unlike the conventional mounting member described in Patent Document 1. Therefore, the first arm portion 62 and the second arm portion 63 (that is, the entire arm portion) are in a non-contact state (non-constrained state) with respect to the mounting member 110.

  The main body 111 is a portion that supports the cylindrical portion 61 of the rotating member 60 and is formed in a substantially cylindrical shape. One end 111 a of the main body 111 is formed in a tapered shape (conical shape) that becomes thinner toward the tip, and is easily inserted into the shaft hole 61 a of the cylindrical portion 61. A concave groove 113 is formed on the outer peripheral surface of the main body 111.

  The concave groove portion 113 is a slide restricting portion that restricts the rotating member 60 from moving in the axial direction with respect to the mounting member 110. The concave groove 113 is formed in an annular shape on the outer peripheral surface of the main body 111. The width W2 of the concave groove 113 is substantially equal to the thickness T1 of the rotating member 60. When the end surface of the cylindrical portion 61 comes into contact with the side surface 113a of the concave groove portion 113, the sliding movement of the rotating member 60 is restricted.

  As shown in FIG. 4B, the bottom surface 113b of the groove 113 is formed in a non-circular shape when viewed in cross section. Specifically, two flat surfaces 113c are provided at intervals of 180 degrees on the bottom surface 113b of the groove 113, and are formed in a so-called oval shape. The flat surface 113 c engages with the flat surface 61 b provided in the shaft hole 61 a of the cylindrical portion 61. As a result, the mounting member 110 and the rotating member 60 cannot be rotated relative to each other. That is, the second non-circular portion 300 as the second rotation restricting portion is configured by the bottom surface 113b of the concave groove portion 113 formed in a non-circular shape and the inner peripheral surface of the shaft hole 61a also formed in a non-circular shape. Yes.

As shown in FIGS. 4C and 4D, the shaft attachment hole 112 is a hole formed so as to penetrate from the one end side to the other end side of the main body 111. The shaft mounting hole 112 is formed by connecting five hole portions having different diameters in the axial direction. For convenience of explanation, these five holes are referred to as a first hole 112a to a fifth hole 112e in order from the one end 111a side of the main body 111. In the present embodiment, one flat surface 112f is formed on a part of the inner peripheral surface of the fourth hole portion 112d. That is, the cross-sectional shape of the fourth hole 112d is noncircular.
In addition, the 5th hole 112e is formed in the taper shape which diameter-expands, so that it leaves | separates from the 4th hole 112d. Further, the inner diameter of the second hole 112b is the smallest, and the third hole 112c, the first hole 112a, the fourth hole 112d, and the fifth hole 112e increase in this order.

  As shown in FIG. 5, the worm shaft 120 is a rod-shaped member that serves as the rotation axis of the rotation member 60. The worm shaft 120 includes a worm portion 121 formed on one end side and an insertion portion 122 formed on the other end side.

  The worm portion 121 is a screw-shaped gear that engages with the worm wheel 42 described above.

  The insertion part 122 is a part that is inserted into the shaft attachment hole 112 of the mounting member 110. The insertion portion 122 is formed to have an outer diameter corresponding to the first hole portion 112a to the fifth hole portion 112e of the shaft attachment hole 112. The insertion portion 122 has a flat surface 122a at a position corresponding to the flat surface 112f of the shaft attachment hole 112. As shown in FIG. 5B, the cross-sectional shape of the insertion portion 122 passing through the flat surface 122a is non-circular. With the insertion portion 122 of the worm shaft 120 inserted into the shaft attachment hole 112 of the mounting member 110, the flat surface 122a engages with the flat surface 112f of the mounting member 110. Thereby, the worm shaft 120 and the mounting member 110 cannot be rotated relative to each other. That is, as the first rotation restricting portion, the inner peripheral surface of the fourth hole 112d formed in a non-circular shape and the outer peripheral surface (the outer peripheral surface including the flat surface 122a) of the insertion portion 122 also formed in a non-circular shape. The first non-circular portion 200 is configured.

  As shown in FIG. 6, the sliding contact member 70 includes a bottomed cylindrical peripheral wall portion 71 in which the rotating member 60 is disposed, a pair of upper protruding pieces 72 protruding upward from the peripheral wall portion 71, and a peripheral wall portion. 71 and a pair of lower protruding pieces 73 protruding downward from 71.

  A bearing portion 71 a that supports the other end of the worm shaft 120 is recessed in the bottom portion of the peripheral wall portion 71. When the rotating member 60 is rotated, the outer peripheral surfaces of the second arm portion 63 and the weight portion 64 that are spread out are in sliding contact with the inner peripheral surface 71 b of the peripheral wall portion 71.

  The pair of upper protruding pieces 72 are plate-like portions extending upward from the outer peripheral surface of the peripheral wall portion 71 and are spaced apart from each other in the left-right direction. The upper end portions of the pair of upper protruding pieces 72 protrude upward from the upper end portion 71 c of the outer peripheral surface of the peripheral wall portion 71.

  The pair of lower projecting pieces 73 are plate-like portions extending downward from the outer peripheral surface of the peripheral wall portion 71 and are spaced apart from each other in the left-right direction. The lower end portions of the pair of lower protruding pieces 73 protrude below the lower end portion 71 d of the outer peripheral surface of the peripheral wall portion 71.

  As shown in FIG. 2, the pair of upper protruding pieces 72 are fitted in a concave groove 34 d provided on the upper wall of the case member 34. Further, the pair of lower projecting pieces 73 are fitted in a concave groove 34 f provided in a rib 34 e projecting from the side wall of the case member 34. That is, the sliding contact member 70 (more specifically, the peripheral wall portion 71) is supported by the case member 34 via the pair of upper protruding pieces 72 and the pair of lower protruding pieces 73.

  On the other hand, as shown in FIG. 6, the vicinity of the upper end 71 c of the peripheral wall 71 between the pair of upper protruding pieces 72 is not directly supported by the case member 34. Further, the vicinity of the lower end 71 d of the peripheral wall 71 between the pair of lower protruding pieces 73 is not directly supported by the case member 34. Further, the vicinity of the left and right end portions 71 e and 71 f of the peripheral wall portion 71 between the left and right upper protruding pieces 72 and the left and right lower protruding pieces 73 are not directly supported by the case member 34. Thereby, the rigidity of the up-down direction of the surrounding wall part 71 and the rigidity of the left-right direction (horizontal direction) of the surrounding wall part 71 become substantially equal.

  Here, an interval S between the inner peripheral surface 71b of the peripheral wall portion 71 and the outer peripheral surface of the weight portion 64 (see FIG. 6B) is a predetermined value in which the slat 7 of the horizontal blind 1 is higher than the maximum descending position of the slat 7. It is set so that the outer peripheral surface of the weight portion 64 is separated from the inner peripheral surface 71b of the peripheral wall portion 71 when it is lowered to the lowered position. In the present embodiment, the predetermined lowering position is set to a lowering position such that, for example, one or two of the lower slats 7 are still on the bottom rail 6 and are not deployed.

  Next, operations and effects of the speed adjusting device 30 and the horizontal blind 1 having the same will be described.

  When the operation cord 3 is operated and the clutch mechanism 12 is disconnected while the lifting / lowering cord 4 is wound on the winding shaft 14, the bottom rail 6 is lowered by its own weight, and the lifting / lowering cord 4 is rewound, and the winding shaft 14 and the drive shaft 13 rotate in the rewind direction of the lifting / lowering cord 4.

  As the drive shaft 13 rotates, the input shaft 31 of the speed adjusting device 30 connected to the left end of the drive shaft 13 rotates. The rotation of the input shaft 31 is accelerated by the speed increasing wheel train 40, and the rotating member 60 connected to the last stage of the speed increasing wheel train 40 rotates at a speed 70 times that of the drive shaft 13, for example.

  When the rotating member 60 rotates at a high speed, centrifugal force acts on the second arm portion 63 and the weight portion 64, and the second arm portion 63 and the weight portion 64 move outward in the radial direction. Accordingly, the second arm portion 63 is elastically deformed so as to expand with respect to the first arm portion 62.

  When the second arm portion 63 and the weight portion 64 are expanded, the outer peripheral surfaces of the second arm portion 63 and the weight portion 64 are in sliding contact with the inner peripheral surface 71 b of the peripheral wall portion 71. Since the second arm portion 63 and the weight portion 64 are strongly pressed against the inner peripheral surface 71b by centrifugal force, a frictional force (braking force) is generated between them. When the force with which the bottom rail 6 pulls the lifting / lowering cord 4 and the frictional force balance, the lowering speed of the bottom rail 6 becomes constant. Further, the second arm portion 63 and the weight portion 64 vibrate by sliding contact with the inner peripheral surface 71b of the peripheral wall portion 71, and generate a vibration sound.

  At this time, in the speed adjustment device 30 according to the present embodiment, the first arm portion 62 and the second arm portion 63 are not in contact with the mounting member 110. Therefore, since the entire arm portion vibrates, the vibration frequency becomes smaller than when only the second arm portion 63 vibrates (when the first arm portion 62 is constrained), and the vibration sound is reduced. Further, it is possible to prevent the generation of noise due to the contact between the first arm portion 62 and the second arm portion 63 and the mounting member 110. Furthermore, since the mounting member 110 has the concave groove portion 113 that is locked to the tubular portion 61 of the rotating member 60 and restricts the axial movement of the tubular portion 61, the axial movement of the rotating member 60 is restricted. can do. Therefore, unlike the prior art (Patent Document 1), it is not necessary to provide the guide protrusion and the claw portion on the loading member 110, and the silence can be improved while simplifying the parts.

  Furthermore, as a result of experiments and research by the inventors, when other conditions such as the length of the second arm portion 63 and the size and mass of the weight portion 64 are the same, the first arm portion 62 passes through the center position in the width direction. When the axis line CL1 is configured to be shifted to the front side in the rotation direction with respect to the virtual line D1 passing through the rotation center O and parallel to the axis line CL1, the axis line CL1 coincides with the virtual line D1 (the axis line CL1 is rotated). It has been found that the vibration noise is small compared to the configuration (through the center O).

  Therefore, according to the speed adjustment device 30 according to the present embodiment, the axis CL1 passing through the center position in the width direction of the first arm 62 is forward in the rotation direction with respect to the virtual line D1 passing through the rotation center O and parallel to the axis CL1. Therefore, for example, the vibration noise can be suppressed more than when the axis CL1 coincides with the virtual line D1, while increasing the braking force by extending the length L2 of the second arm portion 63. Moreover, if the braking force is the same, vibration noise can be reduced.

  Further, since the length L2 of the second arm portion 63 (the length from the first arm portion 62 to the weight portion 64) is larger than the width W1 of the first arm portion 62, the second arm portion 63 is caused by centrifugal force. It becomes easy to expand, the contact area of the 2nd arm part 63 and the sliding contact member 70 increases, and braking force can be enlarged.

  Further, since the thickness T1 of the rotating member 60 in the rotation axis direction is larger than the width W1 of the first arm portion 62, the contact area between the rotating member 60 and the sliding contact member 70 increases, and the braking force can be increased. it can. Further, since the thickness T1 of the first arm portion 62 and the second arm portion 63 in the rotation axis direction is larger than the width W1 of the first arm portion 62, the rotation axes of the first arm portion 62 and the second arm portion 63 are the same. Directional rigidity increases. Therefore, since the deformation of the first arm portion 62 and the second arm portion 63 in the rotation axis direction is suppressed, the guide protrusion and the disk portion provided on the conventional loading member can be omitted.

  Further, the worm shaft 120 and the mounting member 110 have a first non-circular portion 200 as a first rotation restricting portion that restricts relative rotation with each other. The first non-circular portion 200 is formed in a non-circular shape in the worm shaft 120 and the shaft mounting hole 112 in a cross-sectional view in a direction orthogonal to the rotation axis, and engages with each other so as not to rotate relative to each other. Therefore, since the relative rotation of the worm shaft 120 and the mounting member 110 is restricted by the first non-circular portion 200, the rotation of the rotating member 60 due to idling of the worm shaft 120 can be prevented.

  In addition, the mounting member 110 and the rotating member 60 have a second non-circular portion 300 as a second rotation restricting portion that restricts relative rotation of each other. The second non-circular portion 300 is formed in a non-circular shape on the bottom surface 113b of the concave groove portion 113 and the inner peripheral surface 112a of the shaft hole 112 in a cross-sectional view in a direction orthogonal to the rotation axis, and engages with each other so as not to rotate relative to each other. . Therefore, since the relative rotation of the mounting member 110 and the rotating member 60 is restricted by the second non-circular portion 300, the non-rotation of the rotating member 60 due to the idling of the mounting member 110 can be prevented.

  Further, for example, in the conventional horizontal blind 1, the lower one or two of the plurality of slats 7 are difficult to deploy due to the frictional force generated between the drive shaft 13 or the winding shaft 14 and the bearing portion. There was a thing. On the other hand, the distance S between the inner peripheral surface 71b of the peripheral wall portion 71 and the outer peripheral surface of the weight portion 64 is such that the slat 7 of the horizontal blind 1 descends to a predetermined lower position that is higher than the maximum lower position of the slat 7. Further, the outer peripheral surface of the weight portion 64 is configured to be spaced from the inner peripheral surface 71 b of the peripheral wall portion 71. Accordingly, the braking force (friction force) of the speed adjusting device 30 becomes zero before the rotational speed of the rotating member 60 (that is, the descending speed of the shielding material) becomes zero. Therefore, the slat 7 which is a shielding material can be smoothly lowered to the maximum lowering position.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the present embodiment, the case where the speed adjusting device of the present invention is applied to a horizontal blind having a plurality of slats is described. However, the speed adjusting device of the present invention is not limited to a roman shade (raised curtain) or a pleated screen. It can be applied to various solar shading devices such as.

  In the present embodiment, the four first arm portions 62, the second arm portions 63, and the weight portions 64 are provided on the rotating member 60 at intervals of 90 degrees. However, the present invention is not limited to this. The first arm part 62, the second arm part 63, and the weight part 64 may be provided so as to be rotationally symmetric. For example, two may be provided at intervals of 180 degrees, or three may be provided at intervals of 120 degrees. .

  In the present embodiment, the first arm portion 62 and the second arm portion 63 are configured to be continuous so as to be bent at an angle of approximately 90 degrees. However, the shape of the arm portion is not limited to this, For example, the entire arm portion may be curved in an arc shape.

  In the present embodiment, the worm shaft 120 is used as the shaft serving as the rotation axis. However, a shaft having a gear other than the worm gear or a rotation mechanism may be used.

The first and second non-circular portions may be formed in a polygon such as a quadrangle or a regular hexagon. Moreover, you may make a noncircular shape by forming a protrusion and a recessed part in a part of circular outer peripheral surface (or inner peripheral surface).
Furthermore, the first and second rotation restricting portions are not limited to the first and second non-circular portions, and for example, the relative rotation of the two members may be restricted using a fixing member such as a screw or a screw. Good.

  Further, the predetermined lowering position where the weight portion 64 is separated from the inner peripheral surface 71b of the peripheral wall portion 71 is not particularly limited, and the interval S may be set as appropriate so that the slats 7 can be smoothly deployed to the end.

1 Horizontal blind (sunlight shielding device)
2 Head box 4 Lifting cord 7 Slat (shielding material)
DESCRIPTION OF SYMBOLS 10 Lifting device 13 Drive shaft 30 Speed adjustment device 60 Rotating member 61 Cylindrical part 61a Shaft hole 61b Flat surface 62 1st arm part 63 2nd arm part 64 Weight part 70 Sliding contact member 110 Mounting member 111 Main body part 112 Shaft attachment Hole 112f Flat surface 113 Concave groove (slide restricting part)
113c Flat surface 120 Worm shaft (shaft)
122 Insertion part 122a Flat surface 200 1st non-circular part (1st rotation control part)
300 Second non-circular portion (second rotation restricting portion)
CL1 Axis D1 Virtual line O Center of rotation

Claims (9)

A shaft serving as a rotation axis;
A rotating member that rotates while elastically deforming so as to expand according to the rotational speed of the shaft;
A mounting member for mounting the rotating member on the shaft;
A sliding contact member installed on the radially outer side of the rotating member and in contact with the expanded rotating member;
A solar shading device speed adjusting device comprising:
The rotating member has a cylindrical part having an axial hole, an arm part extending radially outward from the cylindrical part, and a weight part provided at a tip of the arm part,
The mounting member includes a main body portion that is inserted into the shaft hole of the cylindrical portion, a shaft attachment hole that is provided at the center of the main body portion, and a shaft of the cylindrical portion that is locked to the cylindrical portion. A slide restricting portion that restricts movement in the direction,
The said arm part is a non-contact state with respect to the said member for mounting | wearing, The speed adjustment apparatus of the solar radiation shielding apparatus characterized by the above-mentioned.   2. The solar radiation shielding according to claim 1, wherein the slide restricting portion is an annular groove portion formed on an outer peripheral surface of the main body portion, and the tubular portion is fitted in the groove portion. Device speed adjustment device.   The speed adjusting device for a solar radiation shielding device according to claim 1, wherein the shaft and the mounting member have a first rotation restricting portion that restricts relative rotation between the shaft and the mounting member.   The first rotation restricting portion includes a first non-circular portion that is formed in a non-circular shape in the shaft and the shaft mounting hole in a cross-sectional view in a direction orthogonal to the rotation axis and engages with each other so as not to rotate relative to each other. The speed adjusting device for a solar radiation shielding device according to claim 3.   5. The solar radiation shielding according to claim 1, wherein the mounting member and the rotating member have a second rotation restricting portion that restricts relative rotation of each other. Device speed adjustment device.   The second rotation restricting portion is formed of a second non-circular portion that is non-circularly formed on the outer peripheral surface of the main body portion and the shaft hole in a cross-sectional view in a direction orthogonal to the rotation axis and engages with each other so as not to rotate relative to each other The speed adjusting device for a solar radiation shielding device according to claim 5.   The distance between the sliding contact member and the weight portion is such that the weight portion is separated from the sliding contact member when the shielding material of the solar radiation shielding device is lowered to a predetermined lowering position higher than the maximum lowering position of the shielding material. The speed adjusting device of the solar radiation shielding device according to any one of claims 1 to 6, wherein the speed adjusting device is configured to have such an interval. The arm portion is a first arm portion extending radially outward from the tubular portion;
A second arm portion extending from the tip of the first arm portion toward the rear side in the rotational direction,
The weight portion is provided at a tip of the second arm portion,
The axis line passing through the center position in the width direction of the first arm portion is shifted forward in the rotation direction with respect to a virtual line passing through the rotation center and parallel to the axis line. The speed adjustment apparatus of the solar radiation shielding apparatus of any one of Claims 1.   The speed adjustment device for a solar radiation shielding device according to any one of claims 1 to 8, wherein a thickness of the arm portion in the rotation axis direction is larger than a width of the arm portion in the rotation direction. .

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