JPH1088945A - Manual operating device for electric shutter opening and closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the operating force at the time of manual operation by interlocking a brake mechanism and a manual wind-up mechanism with each other through a self-lock mechanism, and using a lock spring in the self-lock mechanism so as to regulate the transmission of the rotation of a brake shaft to an upper part of a shaft of the manual wind-up unit, and on the other hand, transmitting the rotation of a shaft of the manual wind-up unit to the brake shaft. SOLUTION: In the case of winding up a shutter curtain with manual operation, a second member 15 is rotated by a chain provided in a chain wheel. Diameter of a spring 16 is reduced so that the spring 16 is adhered to the periphery of a main body 15a, and an edge 15d of a notch part 15c abuts on an extension piece 14b of a first member 14, and the first member 14 and the second member 15 are integrally rotated with each other. At this stage, since a ratchet brake member is made to pressure-contact with a brake member, a driving shaft thereof is rotated with the rotation of the chain wheel so as to rotate a wind-up shaft of the shutter curtain. Consequently, the shutter curtain can be wound up by the operating force smaller in comparison with the conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual operation device for an electric shutter switch.

[0002]

2. Description of the Related Art There has been known an electric shutter switch which can be manually opened and closed in response to an emergency such as a fire or a power failure. The structure of such a braking mechanism of a switch will be described.
A brake drum fixed to a motor shaft and a brake drum fixed to a brake shaft are disposed so as to be able to approach and separate from each other, and the brake drum is normally braked by a brake spring provided on the back surface of the brake drum. -Kish-is pressed against.

When the electric motor is energized, the electromagnetic clutch is excited to attract the brake drum, so that a gap is generated between the brake drum and the brake, and the motor shaft can be rotated. When the shutter curtain is wound up, the motor shaft is rotated to sense the upper limit, thereby stopping the energization of the motor, stopping the excitation of the electromagnetic clutch and pressing the brake drum against the brake. . The rotation of the brake drum in the downward direction is regulated by the ratchet mechanism, but the rotation in the upward direction is free.
The brake drum is transmitted to the drum and the brake drum is rotated by the inertia of the motor shaft.

However, the brake drum is usually provided with a chain for manually winding the shutter curtain. When the brake drum rotates due to the inertia of the motor shaft, the chain is wound. (This is referred to as circling of the manual operation device).
As means for preventing such a problem, means for suppressing the chain with a chain sandwiching plate or means for locking the brake disk using a frame have been employed.
However, in any of the means, manual operation requires a force for removing a plate or a frame which is being held down, so that the operation force is heavy. Moreover,
Such a conventional anti-rotation mechanism is integrated with the brake drum, and the manual winding part is also disposed close to the brake drum, so that the structure of the brake drum becomes complicated and the solenoid is operated by a solenoid. There was a fear that the mechanical parts would be magnetized and each mechanism would operate with sticking.

[0005]

SUMMARY OF THE INVENTION The present invention has been conceived to solve such a problem, and is capable of preventing twisting with a simple structure, while reducing the operating force at the time of manual operation. It is an object of the present invention to provide a manual operation device for an electric shutter-opening / closing device which requires only a short time.

[0006]

The technical means adopted by the present invention for solving the above-mentioned problems includes a brake member fixed to a drive shaft driven by an electric motor, and a brake member fixed to one end of the brake shaft. The ratchet brake member is provided so as to be able to contact with and separate from the ratchet brake member. Normally, the ratchet brake member is pressed against the brake member to restrict the rotation of the drive shaft, and the ratchet brake member is forcibly moved. The brake is released from the brake member to release the braking of the drive shaft. The other end of the brake shaft is provided with a self-locking mechanism, and a manual winding portion is provided. A first member provided at the other end of the shaft,
A second member that rotates in conjunction with the rotation of the manual winding part; a lock spring formed in a coil shape and having protrusions at both ends; and a casing that houses these components. When the first member rotates, the lock spring When the second member rotates, the lock spring is reduced in diameter and is separated from the inner peripheral surface of the casing so that the first member and the first member are separated from each other. The two members rotate integrally.

A feature of the present invention is that a ratchet brake member is provided at one end of a brake shaft, and a self-locking mechanism is provided at the other end of the brake shaft. The anti-rotation mechanism is separated and the brake mechanism and the manual hoisting mechanism are interlocked via the self-lock mechanism. The self-lock mechanism uses a lock spring to lock the brake shaft. The rotation is restricted from being transmitted to the manual winding portion, and the rotation of the shaft portion of the manual winding portion is transmitted to the brake shaft.

Preferably, the first member comprises a circular plate-shaped main body, and an extended piece formed by extending a desired portion of the peripheral edge of the main body in a direction perpendicular to the main body surface, and the second member is provided at one end side. A main body in the form of a short cylinder having an opening at the other end, a shaft extending vertically from the surface to the surface, and a desired portion of the peripheral surface of the main body extending in the direction in which the shaft extends. And a notch formed in the notch. The width of the extension of the first member is smaller than the width of the notch of the second member, and when the two are opposed and combined, the extension of the first member surrounds the notch of the second member. A lock spring is provided on the outer periphery of both of them, and the protrusions at both ends thereof are positioned in the play portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an inside view of an electric shutter switchgear. One end of a drive shaft 2 housed in a case 1 is connected to an output shaft 4 via a speed reducer 3. The rotation of the output shaft 4 is transmitted to a take-up shaft of a shutter (not shown) via a sprocket 5 provided at an end of the output shaft 4.

A brake member 6 having a brake 6a is fixed to the other end of the drive shaft 2 so that the drive shaft 2 and the brake member 6 rotate integrally. A brake shaft 7 is rotatably disposed at the other end of the drive shaft 2 on the same axis as the drive shaft 2, and a brake member 6 is provided at one end of the brake shaft 7. A ratchet brake member 8 is fixed to face. The brake shaft 7 is movable in the longitudinal direction, and the brake member 6 and the ratchet brake member 8 are arranged so as to be able to come and go.

The brake shaft 7 is urged toward the drive shaft by a brake spring 9, and a ratchet brake member 8 is provided.
Is always pressed against the brake member 6. The rotation of the ratchet brake member 8 on the side of lowering the shutter curtain is restricted by the engagement of a ratchet claw 8a detachably provided on the case side.
The rotation of the drive shaft 2 is restricted by pressing the brake member 8 against the brake member 6. The ratchet brake member 8 has a shape capable of coping with any rotational direction, and the right and left hand can be changed simply by removing the ratchet claw 8a from the case 1 and changing its direction. , Right type and left type.

An electromagnetic coil 10 is disposed on the rear side of the ratchet brake member 8 in close proximity to the ratchet brake member 8. When the electric motor 11 is energized, the electromagnetic coil 10 is excited to generate a ratchet brake. The member 8 is a brake member 6
And the braking of the drive shaft 2 is released. When the shutter curtain is lowered by the rotation of the drive shaft 2, the power is cut off by a limit switch (not shown) at a predetermined lower limit position, the electromagnetic coil 10 is de-energized, and the ratchet brake member 8 is moved to the brake member. 6 is pressed. next,
To open the opening, when the motor 11 is energized, the electromagnetic coil 10 is excited to separate the ratchet brake member 8 from the brake member 6, and the rotation of the drive shaft 2 causes the shutter curtain to be wound up. At a predetermined upper limit position, the current is cut off by a limit switch (not shown), the electromagnetic coil 10 is de-energized, and the ratchet brake member 8 is pressed against the brake member 6. Since the rotation of the ratchet brake member 8 in the direction of winding up the shutter curtain is not restricted, the ratchet brake member 8 does not hinder the winding of the shutter curtain.

The brake shaft 7 is inserted through a brake release lever 12 so that the brake can be released by an automatic closing device or manually. When the release lever 12 swings, the projection 12a of the release lever 12 comes into contact with a washer 18 described later provided on the brake shaft 7 to forcibly move the brake shaft 7 in the axial direction. The brake member 8 is separated from the brake member 6. The brake shaft 7 must be movable in the axial direction, but it is sufficient if the brake shaft 7 can move back and forth by 1 mm. The distal end portion 12b of the release lever 12 extends into a case of an automatic closing device (not shown), and an operating rod operated by a fire or other detection signal is forcibly released.
12, the shutter curtain is lowered by its own weight. The release lever 12 is provided with a perforation (not shown), and the release lever 12 can be manually swung by connecting a wire (not shown) to the perforation.

At the time of a power failure or the like, it is necessary to manually wind up the shutter curtain.
The chain wheel 13 is rotated by using a chain (not shown) mounted on the chain wheel 13, and the chain wheel 1 is rotated.
The rotation of the shutter 3 is transmitted to the take-up shaft of the shutter curtain to wind up the shutter curtain.
The chain wheel 13 and the brake shaft 7 are interlocked via a self-locking mechanism, and the configuration will be described below.

The self-locking mechanism includes a first member 14 and a second member 14.
It comprises a member 15, a lock spring 16, and a casing 17 for housing the member. The first member 14 is composed of a circular plate-shaped main body 14a and an extension piece 14b formed by extending a desired portion of the peripheral edge of the main body 14a in the vertical direction (axial direction of the brake shaft 7). An insertion hole 14c through which the brake shaft 7 is inserted is provided in the center of the main body.
A screw is engraved on the peripheral surface at the other end of the brake shaft 7, and the brake shaft 7 is inserted into the washer 18 and the first member 14, and a stopper 20 is screwed to the end. By doing so, it is fixed to the first member 14. Reference numeral 19 denotes a guide plate which is mounted in a concave portion (not shown) provided in the case 1. The guide plate 19 has an insertion hole 19a.
The washer 18 and a part of the first member 14 are inserted therethrough.

The second member 15 comprises a short cylindrical main body 15a having a surface at one end and an opening at the other end, and a shaft extending vertically with the surface at the center of the surface. 15b is formed, and a notch 15c is formed by notching a desired portion of the peripheral surface of the main body 15a in the extending direction of the shaft 15b. The first member 14 and the second member 15 have substantially the same diameter, the width of the extension piece 14b of the first member 14 is smaller than the width of the notch 15c of the second member 15, and the two members face each other. When combined, the extension piece 14b of the first member 14 is positioned with play in the circumferential direction (rotational direction) in the notch 15c of the second member 15.

The casing 17 is a short cylindrical member having a surface at one end and an open end at the other end, and is mounted on the casing 1 of the brake portion. The second member 1 is provided on the surface.
5 is provided with an insertion hole 17a through which the shaft portion 15b is inserted. A bush 21 is provided in the insertion hole 17a so as to rotatably receive the shaft portion 15b. Casing 17
The chain wheel 13 is fixed to the protruding shaft portion 15b, and the second member 15 is rotated by rotating the chain wheel 13.

The lock spring 16 is a coil spring in which a linear member is formed in a spiral shape, and has projecting members 16a, 16a projecting radially inward at both ends. The lock spring 16 is wound around the outer peripheral surface of the combination of the first member 14 and the second member 15, and the protrusion 16 a at the end is formed by the extension piece 14 b of the first member 14 and the second member 1.
5 is located between the notch 15c and the edge 15d.

In this state, when the first member 14 rotates, the extension piece 14b of the first member 14
The spring 16 expands in the radial direction while rotating while abutting on a, and is pressed against the inner peripheral surface of the casing 17 to restrict the rotation. The spring 16 is always in light contact with the inner peripheral surface of the casing 17 so that even if the spring 16 is slightly expanded, the spring 16 is pressed against the inner peripheral surface of the casing 17 and braking is performed. Has become. Second member 1
When the member 5 rotates, the notch edge 15d of the second member 15 rotates while abutting on the projection 16a of the spring 16, and the spring 16 contracts in the radial direction and comes into close contact with the outer peripheral surface of the main body 15a of the second member 15. Spring 16 is casing 17
Does not come into sliding contact with the inner peripheral surface. Therefore, the second member 15
The notch edge 15d rotates integrally with the extension piece 14b of the first member 14 while contacting the extension piece 14b, so that the rotation of the second member 15 is transmitted to the first member 14.

In order to close the opening by lowering the shutter curtain in the switchgear thus configured,
The electric motor 11 is energized to excite the electromagnetic coil 10 to attract the ratchet brake member 8, thereby releasing the braking and rotating the drive shaft 2 to lower the shutter curtain. Alternatively, the brake release lever 12 is swung by an automatic closing device or manually to release the braking of the drive shaft 2,
The shutter curtain is lowered by its own weight. When the shutter curtain descends by its own weight, it descends while being braked by a governor mechanism (not shown). The descending shutter curtain is stopped at a predetermined position by a lower limit mechanism or a lower position adjustment mechanism (not shown).

Next, in order to wind up the shutter curtain and open the opening, the electric motor 11 is energized to excite the electromagnetic coil 10 and the ratchet brake member 8 is attracted to release the braking. The drive shaft 2 is rotated to wind up the shutter curtain. When the shutter curtain is raised to a predetermined position, the electric motor 11 is driven by the upper limit mechanism.
Is turned off, the excitation of the electromagnetic coil 10 is also released, and the ratchet brake member 8 is pressed against the brake member 6. At this time, the drive shaft 2 slightly rotates due to the inertial force of the electric motor 11, and the rotation is transmitted to the ratchet brake member 8. However, when the brake shaft 7 rotates, the first member 14 rotates accordingly. Then, the diameter of the lock spring 16 expands and slides on the inner peripheral surface of the casing 17, whereby the rotation is regulated.

If the shutter curtain is to be manually rolled up at the time of a power failure or the like, the chain wheel 1 is used.
When the second member 15 is rotated by a chain (not shown) provided on the third member 3, the spring 16 is reduced in diameter with the rotation of the second member 15, and comes into close contact with the outer periphery of the main body 15 a of the second member 15. The edge 15d of the notch 15c of the member 15 abuts on the extension piece 14b of the first member 14, so that the first member 14
And the second member 15 are integrally rotated. At this time, since the ratchet brake member 8 is pressed against the brake member 6, the drive shaft 2 rotates in conjunction with the rotation of the chain wheel 13, and the take-up shaft of the shutter curtain is rotated. Is rotated to wind up the shutter curtain. As described above, since the operation during manual winding is not affected by the mechanism for preventing the rotation, the shutter curtain can be wound with a lighter operating force.

[0023]

The present invention is constructed as described above and has the following advantageous effects. (1) Since the operation at the time of manual winding is not affected by the mechanism for preventing the twisting, there is no need to perform the operation against the mechanism for preventing the twisting as in the related art, and the shutter can be operated with a lighter operating force. The curtain can be wound up. (2) Since the self-locking mechanism and the ratchet brake member are separated from each other, the number of components constituting the ratchet brake member is reduced, so that manufacture and assembly are facilitated and cost can be reduced. Further, since the self-locking mechanism and the ratchet brake member are disposed before and after the electromagnetic coil, the self-locking mechanism is not affected by the solenoid. (3) The ratchet brake member of the present invention is made of a single plate as compared with the conventional ratchet brake member in which the anti-rotation mechanism is integrated, so that the solenoid for attracting the ratchet brake member is smaller. Can be

[Brief description of the drawings]

FIG. 1 is a side view showing an inside view of a switchgear of an electric shutter.

FIG. 2 is an exploded side view showing a braking mechanism of the drive shaft in FIG.

FIG. 3 is an exploded side view showing the self-locking mechanism in FIG.

FIG. 4 is an exploded perspective view of the self-locking mechanism without casing.

[Explanation of symbols]

 Reference Signs List 2 drive shaft 6 brake member 7 brake shaft 8 ratchet brake member 11 motor 13 chain wheel 14 first member 15 second member 16 lock spring 17 casing

Continued on the front page (72) Inventor Hiroshi Miyanokoshi 3-62 Samegachi, Jyushiyama-mura, Kaifu-gun, Aichi Prefecture Ha-moni Co., Ltd.

Claims (1)

[Claims] A brake member fixed to a drive shaft driven by an electric motor and a ratchet brake member fixed to one end of the brake shaft are opposed to and separated from each other. -The rotation of the drive shaft is regulated by pressing the brake member against the brake member, and the ratchet brake member is forcibly separated from the brake member to release the braking of the drive shaft. At the other end of the key shaft, a self-locking mechanism is interposed to provide a manual winding part. The self-locking mechanism is interlocked with the rotation of the manual winding part with the first member provided at the other end of the brake shaft. A rotating member, a lock spring formed in a coil shape and having protrusions at both ends, and a casing housing these components. When the first member rotates, the lock spring expands in diameter and the casing is formed. The rotation is regulated by pressing against the inner peripheral surface of the second part. There locking spring reduced in diameter when rotated Ke - first spaced apart from the inner peripheral surface of the single member and the second
A manual operation device for a switch for an electric shutter, wherein the member and the member are rotated integrally.