JPH0414617Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a locking device for a shutter curtain such as a sheet shutter.

[Problems to be solved by the prior art and the invention] In general, some of these types of shutter curtains, such as sheet shutters, are installed at entrances and exits of factories and warehouses, and are used to absorb energy due to temperature differences between indoors and outdoors. There are some that are designed to minimize loss. However, in this case, the shutter curtain is stretched or inflated by the wind, and is easily pulled up, thereby losing the heat-saving effect. Therefore, attempts have been made to automatically lock the shutter curtain when it is fully closed so that it will not be easily pulled up even if the shutter curtain is exposed to wind. However, if this is done, the shutter curtain will remain locked even if an excessive load is applied to it when a strong wind blows against the shutter curtain.
This poses a problem in that the shutter curtain or the like cannot withstand this and is damaged.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a locking device for a shutter curtain that can eliminate these drawbacks. When the shutter curtain is lowered slightly before it is fully closed, the abutment member on the shutter curtain side comes into contact with the shutter curtain from above and retreats to allow the corresponding member to pass, and as the abutment member passes, the original A swingable lock body is provided which returns to the lock position and restricts the upward movement of the abutment member, and the tangent of the lower contact surface of the lock body where the abutment member abuts from below and exerts a pushing up force is provided. teeth,
It is characterized in that the component force in the direction orthogonal to the tangent is set in a direction biased towards the retracting swinging side with respect to the swinging axis of the lock body.

Although the present invention uses this configuration to lock the shutter curtain when it is fully closed, it automatically releases the lock when an excessive load is applied due to strong winds, etc. This makes it possible to prevent damage to shutter curtains, etc.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, S is a roll-up type sheet shutter, and the lowermost end of the sheet shutter curtain 1 constituting the sheet shutter S is
The aggregate 2 is installed horizontally with both ends protruding in the left-right direction. The entire length of the lower surface of the aggregate 2 at the lowest end of the shutter curtain 1 is made of a rubber elastic material so that it comes into close contact with the floor surface when the shutter curtain 1 is lowered to the fully closed state. A seat plate portion 3 is provided, and lower end portions of a plurality of actuation wires 4 are connected to each other. The upper end of the operating wire 4 is wound around a winding shaft 5, and as the winding shaft 5 rotates forward and backward by driving the switch 5a, the operating wire 4 is wound around a winding shaft 5.
The shutter curtain 1 is wound or unwound around the winding shaft 5, and the shutter curtain 1 is opened and closed as it is wound around the winding shaft 5 or unwound. be. Here, 6 is a guide rail erected on both sides of the shutter curtain 1, and 7 is an aggregate 2 to run within the guide rail 6.
These are guide rollers provided at both left and right ends of the.

On the other hand, reference numeral 10 denotes a lock device in which the present invention is implemented, and the lock device 10 is attached to both inner surfaces of the left and right guide rails 6 so as to correspond to the position of the seat plate portion 3 when the shutter curtain 1 is fully closed. The storage box 1 of the locking device 10 is provided.
A substantially fan-shaped lock body 11 is disposed in the interior of the guide rail 6, and is located near the lower end of the guide rail 6, and whose upper end (top) is swingably supported on a support shaft 12. The lock body 11 protrudes from the notch 10b of the storage box 10a toward the guide rail 6, and faces the passing path of the aggregate 2 just before it descends when fully closed.
As mentioned above, when the shutter curtain 1 is fully closed, when the aggregate 2 approaches the lock body 11 position, the abutting member 2a provided on the aggregate 2 closes the lock body 1.
The lock body 1 is brought into contact with the inclined surface 11a of the lock body 1 from above.
1 is forcibly retracted to the storage box 10a side, whereby the aggregate 2 passes through the lock body 11 and descends to the fully closed position. When the aggregate 2 passes by, the lock body 11 swings back to the original lock position under its own weight, and is configured to assume a lock position that restricts the upward movement of the abutment member 2a.

Furthermore, the lower edge of this lock body 11 is arcuate, and the arcuate lower contact surface 11b is
The storage box 10a is closer to the axis A of the support shaft 12.
It is formed to have a radius of curvature centered at a position B that is biased by a distance λ toward the retracting swing side of the lock body 11. Then, the fully closed shutter curtain 1 expands due to the wind.
When the aggregate 2 is lifted, the contact member 2a contacts the lower contact surface 11b from below and is pushed upward.

In the embodiment of the present invention configured as described above, when the actuating wire 4 is rewound by the drive of the opening/closing machine 5a and the shutter curtain 1 is fully opened, the abutment member 2a is locked. 11
will be forced to evacuate and pass. As a result, when the shutter curtain is fully closed, the locking body 11, which has returned to its original locking position, restricts the upward movement of the abutment member 2a, and the shutter curtain due to wind etc. In addition to being able to reliably prevent the unnecessary pulling-up phenomenon described in No. 1, it is also possible to ensure indoor and outdoor shielding properties and to suppress energy loss as much as possible.

As described above, in the present invention, although it is possible to lock the shutter curtain 1 in the fully closed state and prevent unnecessary lifting of the shutter curtain 1, it is possible to prevent the shutter from being subjected to an excessive load due to strong winds. When joining the target curtain 1, this lock can be automatically released. That is, the shutter curtain 1 expands due to the wind, and the aggregate 2
When the lock body 11 is about to be lifted, the abutment member 2a abuts the lower abutment surface 11b of the lock body 11 from below.

Therefore, at this contact position C, if the upward lifting force by the contact member 2a is F, then the component force in the direction perpendicular to the tangent D at the contact position C, that is, the center B of the lower contact surface 11b The component force directed in the direction is "F・Cosθ]. However, this center B is biased toward the retracting swing side from the swing axis A of the lock body 11, and therefore, the lock body 11 is With the swing axis A as a fulcrum, a force of "F·Cos θ" acts on the center B of the circular arc surface offset by a distance λ, and the swing torque in the retracting direction described above is generated. When this swinging torque becomes excessive and becomes large enough to overcome the load such as sliding resistance between the abutment member 2a and the lock body 11 and the locking force, the lock body 11 automatically swings to retract and releases the lock. As a result, the backing member 2
Since the shutter a moves upward without being restricted by the lock body 11, damage to the shutter curtain 1 can be prevented, resulting in extremely high safety. And when the wind weakens,
The aggregate 2 moves downward under its own weight again and is locked by the locking body 11.

Further, in the above embodiment, the lock is released when the shutter curtain 1 is raised by the connecting wire 13.
The lock body 11 and the solenoid 14 are connected by the locking mechanism, and the solenoid 14 is operated in conjunction with driving the opening/closing device 5a by operating a push button switch (not shown) to change the lock body 11 to the unlocked position. This can be done by showing yourself.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, but the lower contact surface of the lock body does not need to be a precise circular arc, and the tangent line is defined by the direction perpendicular to the tangent line. It is sufficient that the force is set in a direction biased toward the retracting and swinging side with respect to the rocking axis of the lock body. It may be shaped into a polygonal shape or even into a polygonal shape. The torque required to release the lock is so large that the component force in the direction perpendicular to the tangent line deviates from the swing axis. This means that it can be arbitrarily set whether the lock is released when the material is pulled up. Furthermore, it is not necessarily necessary to separately provide the abutment member, and it may be the aggregate itself or the roller shaft of the guide roller.

[Operations and Effects] In summary, the present invention is constructed as described above, and the shutter curtain can be opened in the fully closed state by the retracting and return swinging of the lock body in conjunction with the fully closed lowering of the shutter curtain. As a result, it is possible to reliably prevent unnecessary lifting due to the locking action of the lock body, resulting in good shielding performance. Moreover, when an excessive load is applied to the shutter curtain in the fully closed state, the component force in the direction perpendicular to the tangent of the lifting force of the abutment member trying to lift the lower contact surface of the lock body will The force acts toward the evacuation swing side rather than the swing axis, and this force acts as a torque to operate the lock body in the release direction, allowing automatic lock release in the event of an overload, and the shutter This prevents the tar curtain from being damaged and makes it extremely safe.

[Brief explanation of the drawing]

The drawing shows one embodiment of the shutter curtain locking device according to the present invention.
The figure is an overall front view with a portion of the seat shutter cut away, Figure 2 is a side view of the same as above, Figure 3 is a side view of the locking device, Figure 4 is a front view of the main part, and Figure 5 is a plan view of the main part. , FIG. 6 is an explanatory diagram of the operation. In the figure, 1 is the shutter curtain, 2 is the aggregate, 2
Reference numeral a designates an abutment member, 6 a guide rail, 10 a lock device, and 11 a lock body.

Claims (1)

[Scope of utility model registration request] When the shutter curtain is lowered slightly before it is fully closed, the guide rail side comes into contact with the abutment member on the shutter curtain side from above, and is retracted to allow the passage of the corresponding member, thereby preventing the abutment member from passing. In addition to providing a swingable lock body that returns to the original lock position and restricts the upward movement of the abutting member,
The tangent line of the lower contact surface of the lock body where the abutment member abuts from below and exerts a pushing up force is such that a component force in a direction perpendicular to the tangent line causes the above-mentioned retraction with respect to the rocking axis of the lock body. A locking device for a shutter curtain, characterized in that it is set to face in a direction biased towards the swinging side.