JP2000213260A - Shutter having viscous braking means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter having a viscous braking means having a mechanism which demonstrates no braking effect when the shutter is started to descend, but is capable of limiting the descending speed by the braking effect in the middle of the descending operation. SOLUTION: When a winding shaft 2 is rotated, an adapter 4 is prevented from being rotated by a nut 5 in the middle of the rotation, and the rotation of a second transmission means 7 in a viscous braking means 3 to be engaged with the adapter 4 is prevented. When the second transmission member 7 is stopped, the viscous torque in the direction opposite to that of the rotation of the winding shaft 2 is applied by the effect of an outer plate 9 of a viscous coupling 3, an inner plate 8 and a viscous fluid, and the rotation of the winding shaft 2 is braked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter for opening and closing an opening of a building by winding or unwinding a slat on a rotating body. More specifically, the present invention relates to a shutter provided with a viscous braking means capable of braking the closing speed of the shutter using the viscous braking means.

[0002]

2. Description of the Related Art Conventionally, a slat-wound shutter has been used to open and close an opening of a building or to protect a glass window from strong rain and the like. FIG. 5 shows a schematic view of such a slat-mounted shutter. The shutter includes a slat 91 in which a number of slat plates each having a substantially strip shape are swingably connected to each other. The slat 91 is wound around a winding drum 92, and when a winding shaft 93 that rotationally drives the winding drum 92 is rotated forward,
The slat 91 is unwound from the winding drum 92 and descends while being guided by the guide rail 94 to close the opening of the building. On the other hand, when the winding shaft 93 is rotated in the reverse direction,
The slat 91 is wound up by the winding drum 92 and rises, and the opening of the building is opened.

[0003] A driven sprocket 95 attached to the end of the winding shaft 93 and a drive shaft 9 on the electric motor 96 side.
A chain 99 is wound between the drive sprocket 98 and the drive sprocket 98 attached to the drive shaft 7. Then, by operating the electric motor 96 by operating the open / close switch 90 attached near the opening of the building, the slat 91
Can be moved up and down to open and close the opening of the building.

Incidentally, the shutter is a slat 91
When the slat 91 descends, the closing speed of the shutter gradually increases due to the weight of the slat 91. In order to solve this problem, Japanese Patent Application Laid-Open No. 9-96181 discloses a configuration of a shutter in which the winding shaft is provided with a viscous braking means, that is, a viscous coupling.

The shutter with the viscous braking means has the same basic structure as the above-mentioned winding type shutter, but has a viscous braking means 100 shown in FIG. 6 as a further additional structure. The viscous braking means 100 includes, as a main component, a first transmission member 10 which rotates together with the winding shaft 101.
2 and the first transmission member 102 so as to be rotatably engaged with each other, and together with the first transmission member 102, constitute a working chamber 103 defined as an annular sealed space.
09 which is a housing fixed to the second transmission member 104
And a plurality of thin annular fixing plates 1 disposed in the working chamber 103 and engaged with the second transmission member 104 in the rotational direction.
05 and these fixing plates 105 are alternately arranged,
A plurality of thin annular rotating plates 106 engaged with the first transmission member 102 so as to be relatively non-rotatable, a viscous fluid sealed in the working chamber 103, and a shutter after the opening of the building is closed by the shutter. As the total number of rotations of the winding drum 107 increases, the fixed plate 105 and the rotating plate 10
And a viscous resistance increasing means 108 for increasing the viscous resistance generated between them.

According to this shutter with viscous braking means,
A braking torque can be applied to the winding shaft 101 by using viscous resistance generated between the fixed plate 105 and the rotating plate 106. Further, since the viscous resistance generated between the fixed plate 105 and the rotating plate 106 is proportional to the relative rotational speed difference between the two plates, the winding shaft 101
As the rotational speed of the motor increases, the brake torque increases. Further, the viscous resistance increasing means 100 increases the viscous resistance generated between both plates as the total number of rotations of the winding drum 107 after the shutter starts to close the opening of the building increases, so that the shutter is As closing, the brake torque increases.

[0007]

Due to the construction of the shutter with viscous braking means, the viscous braking effect starts to occur at the same time as the winding shaft 107 starts rotating. That is, the shutter with the viscous braking means generates a viscous torque in a direction opposite to the rotation direction from the moment the winding shaft 107 starts rotating, and keeps the shutter until the rotation of the winding shaft 107 (the lowering of the shutter) ends. It is characterized by the fact that braking against the descent of the vehicle works. JP-A-9-
The viscous braking means 100 having the structure disclosed in Japanese Patent No. 96181 is designed so that the braking force gradually increases as the descent proceeds, but the difference is that the braking force is present from the start of the descent. There is no. However, for example, when the height of the shutter is high, there is no significant problem even if the braking force is not generated from the start of the descent, and if the braking force is present from the start of the descent, the descent speed is slow throughout. Therefore, the time until the descent ends (the closing of the opening ends) becomes longer.

In consideration of the above points, especially when the height of the shutter is high, it is more convenient that the acceleration by gravity is present when the shutter starts to descend. Advantageously, no effect exists. However, in order to reduce the impact of landing, when the shutter is lowered (closed), it is more convenient that the lowering speed is lower.

Therefore, the shutter with viscous braking means according to the present invention does not exhibit a braking effect when the shutter starts to descend, but can accelerate the descending speed by gravity and limit the descending speed by the braking effect during the descending. It is an object of the present invention to provide a shutter with viscous braking means having a simple mechanism.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a slat for closing an opening of a building, a winding drum on which the slat can be wound, and a winding shaft for rotating the winding drum. A first transmission member to which the winding shaft is fitted, a second transmission member capable of coaxial relative rotation with respect to the first transmission member, the first transmission member and the second transmission member. An operating chamber formed by a transmission member; a plurality of inner plates disposed in the operation chamber and engaged with the first transmission member so as to be relatively non-rotatable; (2) A shutter with viscous braking means, comprising: a plurality of outer plates engaged with the transmission member so as to be relatively non-rotatable; and a viscous braking means having a viscous fluid filled in the working chamber. The one way An adapter having a large-diameter outer portion and a small-diameter outer portion with a latch interposed is provided, and the small-diameter outer portion has a rotation preventing member that is immovable with respect to the direction in which the winding shaft rotates. The present invention is attained by providing a shutter with viscous braking means, wherein the second transmission member and the adapter are connected to each other by rotation of the slat in the unwinding direction by the one-way clutch.

According to the above configuration of the present invention, when the end of the rotation preventing member is free in the rotation direction of the adapter during the rotation for lowering the slat, the rotation of the adapter and the rotation of the adapter are prevented. Since the blocking member is not engaged in the rotation direction, the rotation of the adapter is not blocked. However, when the end of the rotation preventing member engages with a boundary between the large-diameter outer peripheral portion and the small-diameter outer peripheral portion, that is, the end of the large-diameter outer peripheral portion, the rotation of the adapter is prevented. Is done.

Since the one-way clutch is interposed during the rotation in the unwinding direction, the rotation of the second transmission member becomes impossible if the rotation of the adapter is prevented. As a result, due to the effect of the viscous braking means, a torque in a direction opposite to the rotation direction acts on the winding shaft, and the rotation is braked. Therefore, at the beginning of rotation, the winding shaft is not braked, and thereafter,
The two effects of braking the winding shaft and landing the slat at a safe speed can be achieved at the same time. Further, braking can be applied by the viscous braking means only when the slat is lowered by the one-way clutch.

Here, the height of the slat and the diameter of the winding drum are taken into consideration, and the outer peripheral portion having the small diameter and the size of the rotation preventing member are appropriately set so that the winding shaft has The range for braking the rotation can be set appropriately.

For example, when the height of the slat is high and the weight is light, the length of the small-diameter outer peripheral portion in the circumferential direction is increased, and the length of the rotation preventing member in the rotation direction is increased. You may take it narrowly. By doing so, the range in which the adapter can freely rotate can be made longer, so that the period during which the viscous braking is not applied can be made longer. On the other hand, when the height of the slat is low and the weight is heavy, the length of the small-diameter outer peripheral portion may be reduced and the length of the rotation preventing member may be increased. By doing so, the range in which the adapter can freely rotate becomes shorter, so that the viscous braking can be immediately applied.

Further, according to the above configuration, the range in which the adapter can rotate can be determined according to the diameter of the winding drum. When the diameter of the winding drum is large and small, the larger the diameter is, the larger the unwinding amount of the slat for the same rotation angle is. A braking force is required earlier than in comparison. Therefore, when the diameter of the winding drum is large, the range in which the adapter can be rotated may be shortened.

Further, since the adapter is an independent member and can be replaced, the same rotating mechanism and viscous braking means can be used. Therefore, there is no need for redesign, and design and manufacturing costs can be reduced.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the vicinity of a winding shaft of a shutter with viscous braking means according to an embodiment of the present invention. However, the slats are omitted and not shown. The shutter with viscous braking means mainly includes a winding drum 1 on which the slat can be wound, a winding shaft 2 for driving the winding drum 1 to rotate, and a viscous coupling 3 having a function of viscous braking means. , An adapter 4 and a nut 5 having the function of a rotation preventing member.

The viscous coupling 3 is a well-known one, and mainly includes a first transmission member 6 to which the winding shaft 2 is fitted,
A second rotatable coaxially relative to the first transmission member 6;
A transmission member 7, a working chamber 20 formed by the first transmission member 6 and the second transmission member 7, and a plurality of working chambers disposed in the working chamber 20 and engaged with the first transmission member 6 so as to be relatively non-rotatable. A plurality of inner plates 8, a plurality of outer plates 9 disposed in the working chamber 20 and engaged with the second transmission member 7 so as to be relatively non-rotatable, and a viscous fluid filled in the working chamber 20. Consists of

The second transmission member 7 has an adapter support 10 in the right direction in FIG. Then, two ball bearings 11 are fitted to the adapter support portion 10, and a one-way clutch 12 is fitted to the adapter support portion 10 between the two ball bearings 11. The one-way clutch 12 is set so that the adapter 4 and the adapter support 10 are connected only when the winding shaft 2 rotates to unwind the slat. Further, an annular groove is provided at the right end in FIG. 1 of the adapter support portion 10. By fitting a retaining ring 13 into this groove, the axial direction of the ball bearing 11 (lateral direction in FIG. 1). To prevent movement against. The outer surfaces of these three members, that is, the outer surfaces of the two ball bearings 11 and the one-way clutch 12 and the inner surface of the adapter 4 are fitted.

The adapter 4 has a two-stage outer periphery composed of a large-diameter outer peripheral portion 19 and a small-diameter outer peripheral portion 14. The nut 5 is arranged on the small-diameter outer peripheral portion 14. The nut 5 is screwed with the first bolt 15, and in addition, the first bolt 15 is fixedly mounted on the support plate 17 by being screwed into the bracket 16 in addition to the nut 5. The bracket 16 is also screwed into a second bolt 18 which is shorter than the first bolt 15.

When the winding shaft 2 rotates, the winding shaft 2
The first transmission member 6 rotates with the rotation of. Then
Due to the effect of the viscous coupling 3, viscous torque is mutually transmitted between the first transmission member 6 and the second transmission member 7. At this time, if the second transmission member 7 is in a rotatable state, the first transmission member 6 and the second transmission member 7 rotate substantially integrally due to the effects of the viscous fluid, the inner plate 8 and the outer plate 9, and the winding is performed. No viscous torque acts on the shaft 2. However, if the second transmission member 7 is not rotatable, viscous torque acts on the winding shaft 2 in a direction opposite to the rotation direction of the winding shaft 2 due to the effect described above, and the rotation is braked. multiply.

Hereinafter, the rotation of the second transmission member 7 and the operation of the entire apparatus related thereto will be described. However, unless otherwise noted, rotation in this description refers to rotation in the direction of unwinding the slat (the direction of closing the shutter).

It is the characteristic component of the present invention that determines whether or not the second transmission member 7 is rotatable, that is, the fixed rotation preventing member, that is, the nut 5 and the coaxial shaft with the winding shaft 2. The adapter 4 is capable of various rotations. 2, the nut 5 and the adapter 4 are installed such that the nut 5 is disposed on the small-diameter outer peripheral portion 14.

At the time of rotation, the end portion 1 of the large-diameter outer peripheral portion 19 is rotated.
9a is in a free state with respect to the forward rotation direction (FIG. 2).
In the case of (a), since the adapter 4 is not engaged with the nut 5 in the rotation direction, the rotation of the adapter 4 is not prevented. However, the end 19a of the large-diameter outer peripheral portion 19
Are engaged with the end 5a of the nut 5 in the rotational direction (FIG. 2).
(B)) Then, the rotation of the adapter 4 is prevented.

The second transmission member 7 is installed so as to rotate integrally with the adapter 4 via the one-way clutch during the rotation in the descending direction. 2 The rotation of the transmission member 7 becomes impossible. That is, the second transmission member 7 is in a fixed state.
As a result, as described above, due to the effect of the viscous coupling 3, a torque in a direction opposite to the rotation direction acts on the winding shaft 2, and braking is applied to the rotation.

When the slat is rotated in the winding direction, the one-way clutch 12 disconnects the adapter 4 and the adapter support 10 from each other. It does not hinder the rotation of. Here, once the take-up shaft 2 rotates once in the unwinding direction of the slat, there is a concern that the effect of the one-way clutch 12 prevents the adapter 4 from returning to the original initial position. Even if the winding shaft 4 rotates in the direction of winding the slat, there is no particular problem since a weak sliding contact torque enough to rotate the adapter 4 to the original position is transmitted to each other.

Here, a method of selecting the shapes of the adapter 4 and the nut 5 will be described with reference to FIG. In this embodiment, the adapter 4 and the nut 5 are designed as independent members so that they can be appropriately selected in consideration of the height and weight of the slat. In the case where the slats are high and light, it is preferable to increase the time of non-braking, so that the adapter 4 can be freely rotated to secure a longer range in which the second transmission member 7 is not fixed.
As shown in (a), the small-diameter outer peripheral portion of the adapter 4 is selected to be long, and the width of the nut 5 is selected to be small. On the other hand, when the height of the slat is low and heavy,
Since it is preferable to shorten the non-braking time, in order to take a longer range for fixing the second transmission member 7 by making the adapter 4 unrotatable, for example, as shown in FIG.
The small-diameter outer peripheral portion of the adapter 4 is selected to be narrow, and the width of the nut 5 is selected to be long.

There are two important points in selecting the shapes of the adapter 4 and the nut 5. The first point is that the rotatable range of the adapter 4 is determined according to the height and weight of the slat. For example, even if the width of the nut 5 is long, the outer diameter portion 1 of the adapter 4 having a small diameter
If the length of the nut 4 is long enough, the range of the non-braking will be long, and conversely, if the width of the nut 5 is small, the small diameter outer peripheral portion 14 of the adapter 4 is not long enough.
As a result, the range of non-braking becomes shorter.

The second point is that the range in which the adapter 4 can be rotated is determined according to the diameter of the winding drum. In the case where the diameter of the winding drum is large and the case where the diameter is small, the larger the diameter, the larger the unwinding amount of the slat for the same rotation angle, so that compared to the case where the diameter is small. The braking force is required earlier. Therefore, the adapter 4 and the nut 5 need to be selected correspondingly.

The shapes of the adapter 4 and the nut 5 are as follows.
For example, it may have a shape as shown in FIG. FIG. 4 (a)
The adapter 4 is provided with two small-diameter outer peripheral portions, and the same number of nuts 5 are arranged in each of the two portions. The adapter 4 shown in FIG.
Nuts 5 are provided at each of the small-diameter outer peripheral portions 14 as in FIG. 4A.
The feature of these two examples is that since there are a plurality of engagement portions in the rotational direction between the adapter 4 and the nut 5, unlike the case of the single engagement portion as in the example of FIGS. 2 and 3,
That is, the loads applied to both members are dispersed to some extent. This prevents the force (stress) from being concentrated on one point of the member.

Although not shown, a small-diameter outer peripheral portion 1 is provided.
If the length of the nut 4 in the rotation direction is equal to the width of the nut 5 in the same direction, the rotation of the adapter 4 is prevented from the start of the rotation of the winding shaft 2, and the second transmission member is, in effect, a stationary member. Become.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be appropriately modified.

[0033]

As described above, in the shutter with viscous braking means of the present invention, the second transmission member is provided with the adapter having the large-diameter outer periphery and the small-diameter outer periphery while interposing the one-way clutch. A rotation preventing member that is immovable with respect to the direction in which the winding shaft rotates is disposed on the small-diameter outer peripheral portion, and the second transmission member and the second transmission member are rotated by a one-way clutch when the slat is rotated in the unwinding direction. Since the adapter is connected, the braking effect is not exerted when the shutter is wound up and when the descent starts, the descent speed is accelerated by gravity, and the descent speed can be limited during the descent by the braking effect. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the vicinity of a viscous braking unit of a shutter with a viscous braking unit according to the present invention when viewed from a side.

FIG. 2 is a sectional view when an adapter and a nut (rotation preventing member) are observed from the front. (A) shows the case where the adapter can be rotated, and (b) shows the case where the adapter is prevented from rotating.

FIG. 3 is a cross-sectional view showing a modification of the adapter and the nut (rotation preventing member) when viewed from the front.

FIG. 4 is a cross-sectional view showing a modification of the adapter and the nut (rotation preventing member) when viewed from the front.

FIG. 5 is a front view showing an example of a conventional shutter.

FIG. 6 is a cross-sectional view of the vicinity of a viscous braking unit of a conventional shutter with a viscous braking unit when viewed from a side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding drum 2 Winding shaft 3 Viscous coupling 4 Adapter 5 Nut 6 First transmission member 7 Second transmission member 8 Inner plate 9 Outer plate 10 Adapter support part 11 Ball bearing 12 One-way clutch 13 Retaining ring 14 Small diameter outer peripheral portion 15 First Bolt 16 Bracket 17 Support Plate 18 Second Bolt 19 Large Diameter Outer Part 20 Working Chamber

Claims (1)

[Claims] 1. A slat for closing an opening of a building, a winding drum on which the slat can be wound, and a winding shaft for rotationally driving the winding drum, wherein the winding shaft is fitted. A first transmission member, and a second transmission member capable of coaxial relative rotation with respect to the first transmission member;
An operation chamber formed by the first transmission member and the second transmission member; a plurality of inner plates disposed in the operation chamber and engaged with the first transmission member so as to be relatively non-rotatable; Viscous braking means provided with a plurality of outer plates arranged in the working chamber and engaged with the second transmission member so as to be relatively non-rotatable, and viscous braking means having a viscous fluid filled in the working chamber. A shutter having a large-diameter outer portion and a small-diameter outer portion with a one-way clutch interposed therebetween, wherein the small-diameter outer portion includes the winding shaft. A rotation preventing member that is immovable with respect to the direction in which the slats are rotated by the one-way clutch. Viscous damping means with a shutter, characterized in that the connection state.