JPS6329103Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reverse winding prevention device for a shutter opening/closing machine, in which a manual operation handle is attached to the main shaft of the opening/closing machine that opens and closes the shutter, so that the shutter can be manually hoisted. be.

In general, in the case of electric shutters, when opening and closing manually when electric operation is not possible, such as during a power outage, and in the case of manual shutters, when opening and closing normally, the closing operation of the shutter involves the fall of the shutter curtain's own weight. Although this can be done by unwinding from the take-up shaft,
To open the shutter, simply pushing up the shutter curtain will cause the winding on the take-up shaft to become loose or uneven, making it impossible to reliably wind the shutter. Indeed, it was noticeable and was a cause of shutter failure. Therefore, there is a system in which the main shaft of an opening/closing machine that is interlocked and connected to the winding shaft of the shutter is manually rotated to rotate the winding shaft and wind up the shutter curtain. If you accidentally rotate the main shaft in the opposite direction when the main shaft is fully closed, the shutter curtain will be wound in the opposite direction on the take-up shaft and the shutter will malfunction. Even so, there is a drawback that it is not possible to stop winding the shutter curtain midway and leave it in a half-opened state because the shutter curtain falls due to its own weight. Therefore,
It is proposed to restrict the reverse rotation of the main shaft, but in this case, an actuating body is provided on the boss part for removably fixing the operating handle to the main shaft, and this regulating body is provided on the opening/closing machine side. There is also a mechanism that allows only the rotation of the shutter to be raised, but this requires a separate actuating body on the boss, requires a large number of parts, and is time-consuming to assemble. There are drawbacks such as.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and the boss part is key-fitted to the main shaft of the opening/closing machine so that it can be freely inserted and removed in the axial direction, and is fixed in a non-rotating manner. In the shutter configured to be able to be manually hoisted with an operating handle, the boss portion is formed into a cylindrical shape that is approximately similar to the outer shape of the main shaft with a key surface, while the opening/closing machine has a key surface on the boss portion. A regulating body is provided that comes into contact with the corresponding part and retracts when the operating handle is rotated in the shutter-up direction to allow rotation on the main shaft side, and does not retract and restricts rotation on the main-shaft side when the operating handle is rotated in the shutter-down direction. hand,
It is characterized in that the key surface corresponding portion of the boss portion is used as the actuating portion for the regulating body.

With this configuration, the present invention allows the actuating part formed in the boss part of the operating handle detachably attached to the main shaft to act on the regulating body so as to allow rotation only in the shutter raising direction.
The actuating portion is formed by a portion of the boss portion corresponding to the key surface on the main shaft side without using a separate member.

The structure of the present invention will be explained based on the embodiment shown in the drawings. Reference numeral 1 is a switchgear having a built-in deceleration braking mechanism for an electric shutter, and one end of the main shaft 2 of the switchgear 1 is a chain transmission mechanism. It is interlocked and connected to the winding shaft side 4 of the shutter curtain 4a via a suitable transmission mechanism such as No. 3 or the like. 3a is a sprocket on the main shaft 2 side, 5 is a brake release lever, and 6 is a brake release ring.

A key surface 8 is formed on the outer periphery of the other end of the main shaft 2 protruding from the side surface 7a of the cylindrical cover 7 of the opening/closing machine 1, and a fitting hole having the same shape as the other end of the main shaft 2 in which the key surface 8 is formed is formed. By fitting the cylindrical boss portion 10 of the operating handle 9, which has a cylindrical shape, to the main shaft 2 so as to be freely inserted and removed in the axial direction, the operating handle 9 is fixedly attached to the main shaft 2 in a non-rotating state. It's getting old. The boss portion 10 has a flat portion 10a formed corresponding to the key surface 8 and a circular arc portion 10b, so that the boss portion 10 has a shape substantially similar to the other end portion of the main shaft 2. 9b is a grip portion of the operating handle 9. 11
is a regulating body that regulates the reverse rotation of the main shaft 2, that is, the rotation of the main shaft 2 in the lowering direction of the shutter curtain 4a. Although it is attached so as to be able to move up and down by a screw 11b that passes through the hole 11a, it is normally moved down by its own weight. One side edge of the regulating body 11 is located at a position substantially in contact with the rotation locus a of the main shaft 2, but is separated from the regulating body 11 by an arcuate notch groove 12 formed on one side edge of the regulating body 11. Free rotation is guaranteed. Moreover, this notch groove 1
2, when the boss part 10 of the operating handle 9 is key-fitted to the main shaft 2, the flat part 10a of the boss part 10 becomes an actuating part and acts in contact with the regulating body 11, so that the main shaft 2 is activated by the shaft. Winding up the tar curtain 4a is allowed to rotate in one direction (in the direction of arrow X), but rotation in the opposite direction is restricted. That is,
The boss portion 10 has a flat portion 1 corresponding to the main shaft notch surface 8.
In the opposing position where 0a is parallel to the side edge of the regulating body 11, it is separated from the regulating body 11 to ensure that the regulating body 11 falls under its own weight, but from this opposing position, the operation handle 9 is
When the boss portion 10 is rotated in the direction, the arcuate portion 10b of the boss portion 10 sequentially enters the notch groove 12 and comes into contact with the notch groove 12 in a state where it is pushed up from below to the inner surface of the notch groove 12. Then, when the operating handle 9 is further rotated in the X direction, the regulating body 11 receives the pushing up force of the boss portion 10 that is in contact with it and moves upward along the elongated hole 11a.
It retreats from the rotation locus b of 0 and allows rotation of the main shaft 2 in the X direction. On the other hand, when the operating handle 9 is attempted to be rotated in the direction opposite to the X direction from the facing position, the other end side of the flat part 10a does not come into contact with the notch groove 12, but instead touches the side edge of the regulating body 11 located in the lowered position. Since they are in contact with each other, further rotation is restricted.

In the figure, 13 is a washer and 14 is a nut.

Next, the operation of the present invention constructed as described above will be explained. If the shutter curtain 4a cannot be opened/closed electrically due to a power outage, etc., and it must be opened/closed manually, the brake release lever 5,
The brake mechanism built into the opening/closing machine 1 is released by the brake release ring 6. Thereafter, the shutter curtain 4a can be closed by its own weight or the like. On the other hand, in order to raise the shutter curtain 4a, the operating handle 9 may be fixed to the main shaft 2 of the opening/closing machine 1 and rotated in the direction in which the shutter curtain 4a is wound up by the winding shaft 4.

In such a manual opening/closing operation, the main shaft 2 of the opening/closing machine 1 rotates freely without being subjected to the regulating action of the regulating body 11 during the closing operation when the operating handle 9 is not fixed. The curtain 4a can be smoothly lowered manually.

On the other hand, in order to raise the shutter curtain 4a, it is sufficient to fix the operating handle 9 to the main shaft 2 and rotate it in the direction of the arrow X. This is done by externally fitting it onto the main shaft 2. In this way, when the boss portion 10 is externally fitted onto the main shaft 2, the regulating body 11, which is normally located at the lowered position and is movable up and down in which the notched groove 12 is formed, enters the notched groove 12 from below to regulate the body 1
As described above, the boss part 1
When 0 is rotated in the X direction, the regulating body 11 is pushed upward and retracted, allowing rotation in the X direction, but when rotated in the opposite direction, the regulating body 11 does not retreat and the boss portion 10 is restricted from rotating in the opposite direction. Therefore, when the shutter curtain 4a is manually rolled up and raised, by locking the operation handle 9 necessary for rotating the main shaft 2, a reversal prevention effect is automatically added, and Therefore, the reverse rotation of the main shaft 2 can be restricted and released automatically by effectively utilizing the boss portion 10 of the operating handle 9, and the shutter curtain 4a can be manually raised and lowered without any operational errors. Moreover, in this case, the actuating part that acts on the regulating body 11 is connected to the boss part 10.
There is no need to attach separate parts such as pins to the shaft, and the cylindrical boss shape is formed to be approximately similar to the outer shape of the main shaft 2, and in this case corresponds to the key surface to prevent the boss from rotating. The flat surface portion 10a directly serves as the operating portion, so the number of parts is small, the structure is simple, and it can be provided at low cost and easily.

Incidentally, the present invention is not limited to the above-mentioned embodiment. For example, the cutout groove 12a formed in the regulating body 11 may be formed into a trapezoidal shape as shown in FIG. Compared to an arcuate shape, there is an advantage that generation of a horizontal component force when the boss portion 10 abuts can be eliminated, and the upward movement and retraction of the regulating body 11 can be performed more reliably. Further, although the shape of the boss portion 10 is configured to include a flat portion 10a and a circular arc portion 10b in accordance with the main shaft 2, it may also be configured in a prismatic shape as shown in FIG. 6B.

In summary, since the present invention is constructed as described above, the actuating part provided on the boss side is only allowed to rotate in the shutter-up direction with respect to the regulating body on the opening/closing machine side, and is only allowed to rotate in the shutter-down direction. The rotation of the shutter is restricted, and when the operation handle is stuck, the shutter cannot be lowered. If the boss part is formed in a shape that is approximately similar to the shape of the main shaft with a key surface for preventing rotation of the boss part, the part corresponding to the key surface of the boss part will directly become the actuating part and act as a regulating body. It will work. Therefore, the structure cannot be significantly simplified, and the number of parts can be reduced and the cost can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the reverse winding prevention device for a shutter opening/closing machine according to the present invention.
The figure is a schematic diagram of the main parts of the shutter, Figures 2A and B are front and side views of the opening/closing mechanism, Figures 3A and B are front and side views of the operating handle, and Figures 4A and B are the main parts. 5A to 5D are action explanatory views,
FIGS. 6A and 6B are schematic diagrams of main parts showing other examples. In the figure, 1 is a switch, 2 is a main shaft, 4 is a winding shaft, 4
a is a shutter curtain, 8 is a cutout surface, 9 is an operating handle, 10 is a boss portion, 10a is a flat portion, 10
b is a circular arc portion, 11 is a regulating body, 11a is a long hole, 1
2 and 12a are notch grooves.

Claims (1)

[Scope of utility model registration request] In a shutter configured to enable manual hoisting operation using an operation handle that is fixed to the main shaft of the opening/closing machine so that the boss part is fitted with a key so that the boss part can be freely inserted and removed in the axial direction and fixed in a non-rotating manner, the boss part is attached to the main shaft with a key surface. The opening/closing machine is formed into a cylindrical shape that is approximately similar to the external shape of the switch, and the switch contacts the key surface corresponding part of the boss part, and when the operating handle is rotated in the shutter-up direction, it retreats and rotates on the main shaft side. A shutter opening/closing device characterized in that a regulating body is provided that allows the shutter to rotate in the lowering direction and restricts rotation on the main shaft side without retracting when the shutter rotates in the downward direction, and the key surface corresponding part of the boss part is used as an actuating part for the regulating body. Machine reverse winding prevention device.