JPH08303496A - Centrifugal brake and window opening and closing device - Google Patents

Abstract

PURPOSE: To provide a centrifugal brake capable of increasing braking force when a window is opened and a window opening and closing device adopting the centrifugal brake without enlarging the build. CONSTITUTION: In a centrifugal brake 100 composed of a rotary member 1, a plurality of connecting members 12 projectingly provided from the outer periphery of the rotary member 1 to the radial direction, brake pieces 2 provided with fitting parts to be slidably fitted to the connecting members 12, an elastic wheel 21 for energizing respective brake pieces 2 in the central direction, and a brake shoe 3 arranged on the outer peripheries of the brake pieces 2, the connecting members 12 are inclined in one rotating direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal brake suitable for adjusting a window opening speed of a smoke exhaust window and the like, and a window opening / closing device equipped with the brake.

[0002]

2. Description of the Related Art A device for opening and closing a smoke exhaust window is provided with a window opening biasing mechanism for biasing the shoji in the window opening direction between a window frame and a shoji mounted swingably at one end of the window frame. A wire winding device as a remote control device presses the window opening biasing mechanism to maintain the window closing state. The opening of the smoke exhaust window is performed by releasing the ratchet mechanism of the pulley that winds the wire by operating an operating means such as a push button. When opening the window, if the opening speed of the shoji is too high, the glass may be damaged, the shoji may be deformed, or the impact sound may be too loud.

For this reason, a centrifugal brake is attached to the pulley to limit the opening speed of the shoji. This centrifugal brake includes a rotating member connected to a pulley around which a wire is wound via a speed increasing mechanism, a plurality of connecting guide pins protruding from the rotating member at equal intervals in the radial direction, and a sliding member on the guide pin. It is composed of a brake piece having a fitting guide hole that movably fits, an elastic wheel hung on the outer circumference of the brake piece, and a brake shoe surrounding the outer circumference of each brake piece.

[0004]

In the conventional centrifugal brake, the same braking force acts in the rotation direction for opening the pulley window (one rotation direction) and the rotation direction for closing the pulley window (reverse rotation direction). It was structured. In order to increase the braking force of the brake, there is a method of increasing the weight or the turning radius of the brake piece or increasing the speed increasing ratio of the speed increasing mechanism. However, the former has a drawback that the body and weight are increased and the product cannot be made smaller and lighter, and the latter has a problem that the brake acts even in the rotating direction of closing the window to increase the operation force.

An object of the present invention is to provide a centrifugal brake which can increase the braking force only on the side where the window is opened without increasing the size and weight, and a window opening / closing device incorporating the centrifugal brake. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a rotating member, a plurality of connecting members radially protruding from the outer periphery of the rotating member, and a fitting portion slidably fitted to each of the connecting members. In a centrifugal brake comprising a brake piece having, a urging means for urging each brake piece in a central direction, and a brake shoe arranged on the outer periphery of the brake piece, each of the connecting members has one rotation direction. It is characterized by being inclined.

A centrifugal brake according to a second aspect of the present invention is characterized in that the urging means is an elastic wheel hung on the outer circumference of each brake piece. A centrifugal brake according to a third aspect of the present invention is characterized in that the connecting member is composed of two or more pillars arranged at equal intervals, and is integrally formed with the rotating member.

A centrifugal brake according to a fourth aspect of the present invention is characterized in that the brake piece is formed of a substantially fan-shaped block having an inner side surface with a connecting guide hole slidably fitted in the column body. A centrifugal brake according to a fifth aspect of the invention is characterized in that the elastic wheel is a coil spring wheel fitted in a groove formed on the outer circumference of each of the brake pieces.

A window opening / closing device of the present invention is the centrifugal brake according to any one of claims 1 to 5, a wire winding pulley having a ratchet mechanism, a wire winding lever connected to the pulley, and a release mechanism of the ratchet mechanism. With a wire winding mechanism equipped with, one end is connected to the shoji of the opening and closing window,
The other end consists of a wire connected to the pulley.

[0010]

The centrifugal brake according to the present invention strongly brakes against rotation in the rotation direction (one rotation direction) for opening the window, and brakes against rotation in the rotation direction (reverse rotation direction) to close the window. Since this can be prevented, it is suitable for braking applications such as smoke exhaust windows. The centrifugal brake according to claims 2 to 5 has a small number of parts and can be formed in a simple and sturdy structure, and is therefore small in size, lightweight and excellent in durability. The window opening / closing device according to the sixth aspect can be formed compactly and is excellent in operability and usability.

[0011]

1 and 2 show a centrifugal brake 100 according to an embodiment of the present invention, in which a rotary member 1, four brake pieces 2 arranged on the outer periphery thereof, and each brake piece 2 are provided. The brake shoe 3 surrounds the outer circumference. Rotating member 1
Is composed of a quadrangular block-shaped boss portion 11 and four connecting members 12 that project from the outer peripheral surface of the boss portion 11 at equal intervals in the radial direction of rotation.

In this embodiment, the four connecting members 12 are
Each of them is a flat quadrangular prismatic column that is inclined about 10 degrees in the right rotation direction, and is integrally formed with the rotating member 1 by casting, forging, or the like. Each connecting member 12 may be a column, or a member such as a spring pin formed separately from the boss portion 11 may be fixed to the outer peripheral surface of the boss portion 11.

The number of the connecting members 12 may be 2, 3 or 5 or more, but 4 is optimal from the viewpoints of assembling property, securing of braking force and the like. The inclination angle of each connecting member 12 is 5 degrees to 1 depending on the size, number, weight, etc. of the smoke exhaust window.
It can be appropriately designed within the range of 5 degrees. On the front surface of the boss portion 11,
A small pinion 13 that constitutes a speed increasing mechanism described later is provided coaxially.

The brake piece 2 is composed of a substantially fan-shaped block, and the outer peripheral surface 21 is a 1/4 cylindrical surface having a radius corresponding to the inner diameter of the brake shoe 3. The inside of the brake piece 2 is an inner flat surface 22 having a shape corresponding to the outer peripheral surface of the boss portion 11, and the both sides of the brake piece 2 are radial flat surfaces 23 and 24. A circumferential spring groove 25 is provided on the outer peripheral surface 21, and the inner flat surface 22
A connecting guide hole 26 having a rectangular cross section into which the connecting member 12 is slidably fitted is formed therein. An elastic ring (biasing means) 27 made of a coil spring is fitted in the spring groove 25, and biases the four brake pieces 2 toward the rotation center.

The centrifugal brake 100 includes a rotating member 1
Is rotated counterclockwise as shown in FIG. 1 (A), in addition to the centrifugal force received by the brake piece 2 due to the rotation, as a component force of the inertial force due to the rotational acceleration, the radius along the inclination angle of the connecting member 12 is increased. An external force acting outward in the direction is added. Therefore, the outer peripheral surface 21 of each brake piece 2 is strongly pressed by the brake shoe 3 and the braking force can be increased, as compared with the case where the direction of the connecting member 12 matches the radial direction of rotation.

The centrifugal brake 100 has a rotary member 1
When the brake piece 2 rotates clockwise as shown in FIG. 1B, the centrifugal force received by the rotation of the brake piece 2 is a radial component along the inclination angle of the connecting member 12 as a component force of the inertial force due to the rotational acceleration. It is offset by the inward force. For this reason,
Compared with the case where the direction of the connecting guide pin 12 is aligned with the radial direction of rotation, the urging force applied to each brake piece 2 in the radial direction becomes smaller, and an unnecessary braking force acts to hinder the rotational movement. Can be prevented.

3 to 6 show a window opening / closing device 200 for a smoke exhaust window A (shown in FIG. 6) in which the centrifugal brake 100 is incorporated, and one end of the wire W is connected to a shoji B of the smoke exhaust window A.
And a winding mechanism 300 for winding the wire W. The wire winding mechanism 300 includes a flat and vertically long box 4, and a front lid (face) 43 attached to the front surface of the box 4.
It is housed in a casing 40 composed of Front lid 4
A wire winding lever 5 is attached to the front surface of the wire 3.
The box 4 is installed by being embedded in the wall surface as shown in FIG.

The box 4 has a back plate 41 as shown in FIG.
Is formed integrally with the side wall 42. A wire winding pulley 6 is rotatably housed in the lower portion of the box 4. Between the pulley 6 and the back plate 41 of the box 4, clockwise rotation of the pulley 6 (direction to close the smoke exhaust window A)
And a ratchet mechanism 7 for restricting the counterclockwise rotation (the direction in which the smoke exhaust window A is opened).

The centrifugal brake 100 is provided in an intermediate portion of the box 4, and the upper portion of the box 4 releases the restriction for the counterclockwise rotation of the pulley 6 by the ratchet mechanism 7 to open the smoke exhaust window A. A button P is provided. A lever connecting member 45 for connecting the pulley 6 to the lever 5 is rotatably fitted in the front lid 43 of the box 4. The lever connecting member 45 is a columnar body whose both ends have a flange-shaped large diameter portion, and a splined shaft hole is formed at the rear end. The splined shaft hole is connected to a hexagonal hole formed in the shaft center of the pulley 6 by interposing a transmission shaft 46.

The front plate 61 of the pulley 6 has a large pinion 81 with teeth cut off on the outer periphery, and meshes with an idle gear 82 provided between the pulley 6 and the brake 100. The idle gear 82 meshes with the small pinion 13 of the rotating member 1 and makes the rotating speed of the rotating member 1 5 to 10 times (7 times in this embodiment) the rotating speed of the pulley 6.
A speed increasing mechanism 8 for increasing the speed is configured.

The lever 5 is connected to the lever connecting member 45. The lever 5 includes a base portion 52 pivotally attached to the front surface of the connecting member 45 by a pin 51, and a tip portion 54 to which a rotating handle 53 is attached. On the front lid 43 between the release button P and the centrifugal brake 100, the rotating handle 5
The third fitting hole 47 is opened. As a result, the lever 5 is folded upward with the pin 51 as a fulcrum when not in use, as shown in FIG. 4 or 5B.

The smoke exhaust window A is normally closed, and the button P is pushed in to open it. By this operation, the ratchet mechanism 7 is released via the link mechanism 71 (see FIG. 3), and the pulley 6 is allowed to rotate freely. The shoji B of the smoke exhaust window A is pushed by a piston Q as a window opening urging mechanism and separated from the window frame C, and then the wire W is unwound from the pulley 6 by its own weight and opened.

At this time, the rotating member 1 is rotated at a speed several times higher than the rotating speed of the pulley 6, and the brake piece 2 is brought into sliding contact with the brake shoe 3 for braking, so that the opening speed of the shoji B is reduced within an appropriate range. Let As a result, it is possible to reduce the impact caused by the sudden stop of the shoji B at the end of opening, and prevent inconveniences such as breakage of the window glass, deformation of the shoji, and generation of a loud impact sound. In the present invention, in the centrifugal brake 100, since the connecting member 12 is inclined in the clockwise direction, the force with which the brake piece 2 is pressed against the brake shoe 3 is large, and even a small and lightweight brake 100 has a large braking force. can get.

When the smoke exhaust window A is closed, the tip end portion 54 of the lever 5 is grasped and pulled forward, the rotating handle 53 is taken out to the state shown in FIG. 5 (A), and the lever 5 is rotated counterclockwise. When the rotating speed of the pulley 6 for winding the wire W is high, the rotating member 1 also rotates at a high speed. At this time, if the brake piece 2 is brought into sliding contact with the brake shoe 3 by the centrifugal force, the force required for winding the wire W becomes unnecessarily large.

In the present invention, since the connecting member 12 is inclined in the clockwise direction and the centrifugal force of the brake piece 2 is offset, the brake piece 2 slides on the brake shoe 3 even if the lever 5 is rotated at a high speed. It is possible to prevent the contact and to prevent the operation force from unnecessarily increasing.

In the above embodiment, the brake piece 2 is provided with the connecting guide hole and the rotating member 1 is provided with the connecting member. However, conversely, the rotating member 1 is provided with the connecting guide hole and the brake piece 2 is projected with the connecting member. You may set it up. The urging means for urging each brake piece toward the center may be an urging means such as a spring provided for each brake piece 2. Further, even when the elastic wheel is used, the elastic wheel may be provided over the outer circumference of each brake piece 2 by providing a hooking portion.

[Brief description of drawings]

FIG. 1 is a front view of a centrifugal brake.

FIG. 2 is a perspective view of a centrifugal brake.

FIG. 3 is a front view showing a state in which a front lid of the wire winding mechanism of the window opening / closing device is removed.

FIG. 4 is a side sectional view of the window opening / closing device.

FIG. 5 is a perspective view of a front lid portion of the wire winding mechanism.

FIG. 6 is a perspective view of a window opening / closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating member 12 connecting member (column) 2 brake piece 27 elastic wheel (biasing means) 3 brake shoe 4 box 43 front lid 5 wire winding lever 6 wire winding pulley 7 ratchet mechanism 8 speed increasing mechanism 100 centrifugal brake 200 Window opening / closing device 300 Wire winding mechanism

Claims (6)

[Claims] 1. A rotating member, a plurality of connecting members provided in a radial direction from an outer periphery of the rotating member, a brake piece having fitting portions slidably fitted to the connecting members, and brakes. In a centrifugal brake comprising a biasing means for biasing the piece toward the center and a brake shoe arranged on the outer periphery of the brake piece, each of the connecting members is inclined in one rotation direction. Formula brake. 2. The centrifugal brake according to claim 1, wherein the urging means is an elastic wheel hung on the outer circumference of each brake piece. 3. The centrifugal brake according to claim 1, wherein the connecting member is composed of two or more pillars arranged at equal intervals, and is integrally formed with the rotating member. 4. The brake piece according to claim 3,
A centrifugal brake, comprising a substantially fan-shaped block having a connecting guide hole that is slidably fitted on the inner surface of the pillar. 5. The centrifugal brake according to claim 2, wherein the elastic wheel is a coil spring wheel fitted in a groove formed on the outer periphery of each brake piece. 6. The centrifugal brake according to claim 1,
A wire take-up pulley having a ratchet mechanism, a wire take-up lever connected to the pulley, and a wire take-up mechanism having a release mechanism of the ratchet mechanism, one end of which is connected to a shoji of an opening / closing window and the other end of which is A window opening and closing device consisting of a wire connected to a pulley.