JPH0428603Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention applies brakes to smoke shutters, fire doors, etc. to open them, and then releases the brake and closes them when a fire occurs. This invention relates to an automatic braking force release device for making the brake force stop.

[Problems to be solved by the prior art and the invention]

Conventionally, this type of automatic braking force release device is known, for example, in Japanese Utility Model Publication No. 56-21417. However, when such an automatic braking force release device is used in an explosion-proof area such as a factory or laboratory where flammable chemicals are used, it must be completely isolated from the air in the installation atmosphere to prevent ignition from sparks, etc. need to be blocked. For this reason, in the past, the entire automatic braking force release device was tightly covered to make it explosion-proof, which resulted in the entire device becoming larger and heavier.
Moreover, there were some difficulties in handling, which became a problem.

[Means to solve the problem]

In view of the above-mentioned circumstances, the present invention aims to provide an automatic braking force release device that can eliminate these shortcomings. When the solenoid part that is activated by the solenoid part and the actuating body that is locked and held in the non-acting position by the operation of the solenoid part are released, the actuating body is automatically displaced to the working position and the braking force is released. The solenoid section is characterized in that the solenoid section is housed in an explosion-proof case that is shielded from the outside air in the installation atmosphere.

The object of the present invention is to provide an explosion-proof automatic braking force release device that is compact in size and extremely easy to handle due to this configuration.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes an explosion-proof automatic braking force release device, and the release device 1 includes a solenoid section 2.
and an operating section 3. That is, the plate-shaped actuating body 4 constituting the actuating section 3
is inserted through a frame plate 6 fixed to the base plate 5 so as to be slidable in the left and right direction, and a coil bomb 7 is interposed between the stopper 4a provided on the operating body 4 and the frame plate 6. Due to the biasing force, the actuating body 4 is constantly urged in a direction in which the tip thereof protrudes from the frame plate 6. A wire clip 4b is provided at the base end of the actuating body 4, and one end of an actuating wire 8 operatively connected to a braking device (not shown) is integrally attached and fixed thereto. Note that 9 is an outer receiver for the actuating wire 8. Furthermore, a lever 10 is pivotally supported on a bracket 6a projecting from the frame plate 6 so as to be swingable about a pin shaft 10a. A locking pin 10b is provided on the bracket 6a, and an engaging groove 4c is formed in the operating body 4 so as to face the locking pin 10b.

On the other hand, the solenoid section 2 is integrally fixed to a vertical piece 5a planted on the base 5, and the solenoid section 2 has a solenoid 11 and a lead wire 12a introduced therein, and is equipped with necessary switches, etc. The control section 12 includes the following members, and an explosion-proof case 13 that covers these components in an explosion-proof manner. That is, the explosion-proof case 13
1 and the control unit 12 are installed internally so as to be isolated from the outside air in the installation atmosphere.This is installed by tightly securing it to the vertical piece 5a using the tightening bolt 14, and this explosion-proof Case 1
An operating shaft 11a of a solenoid 11 protruding from the lever 10 is extended to face the lever 10. When the solenoid section 2 is in a non-operating state, that is, under normal conditions, the actuating shaft 11a receives the lever 10 in an upright position, thereby causing the locking pin 10b to move into the engaging groove 4c of the retracted actuating body 4. The actuating body 4 is held in a non-operating position by being fitted and locked to the actuating member 4. In this state, the braking device is in its normal operating state and applies braking to the lowering of the shutter. If an emergency such as a fire occurs in this state, and a command from a sensor (not shown) is detected and transmitted to the control unit 12 through the lead wire 12a, the solenoid 11 is activated in response. , the operating shaft 11a protrudes to the operating position. As a result, the lever 10 is pushed in the direction of the arrow and swings about the pin shaft 10a as a fulcrum, the locking pin 10b is pulled out from the engagement groove 4c, and the actuating body 4 is moved from the frame plate by the biasing force of the coil bomber 7. 6, by means of which the actuating wire 8 is pulled, the braking device is
The braking force is automatically released and the shutter descends. Note that 15 and 16 are return bullets for the lever 10.

In the embodiment of the present invention configured as described above, when an emergency situation such as a fire occurs, the solenoid 11 is activated in response to a command from the sensor that has detected this as described above, and the lever 10 is thereby activated.
As a result, the holding of the actuating body 4 is released, and the actuating body 4 receives the biasing force of the coil projectile 7 and protrudes.Thereby, the braking force of the braking device is automatically released and the shutter is automatically activated. It will be closed.

In this way, in the present invention, the braking device is automatically released by the operation of the automatic release device 1, but the solenoid 11 and its control section 12 are built inside the explosion-proof case 10. Therefore, it can be used as is in explosion-proof areas. That is, in the automatic release device 1, the solenoid section 2, which has various electrical contacts that may cause sparks, etc., is housed inside the explosion-proof case 10 and is shielded from the outside air, so that it is not triggered by sparks, etc. It is safe as there is no chance of the chemicals catching fire. Moreover, this explosion-proof structure was achieved by covering only the solenoid section 2 that generates sparks with the explosion-proof case 10, instead of covering the entire automatic release device as in the conventional case, so the release device 1 can be made smaller and lighter. , and easy to handle.

[Effect]

In summary, since the present invention is constructed as described above, the braking force is automatically released in conjunction with the operation of the actuating section upon receiving an emergency detection command from the sensor. However, since the solenoid that operates electrically in response to the sensor command is housed in an explosion-proof case, even if a spark occurs, it will not become a source of ignition for flammable gas contained in the installation atmosphere. There is no risk of accident, and it is extremely safe. Moreover, this explosion-proof structure covers only the electrical solenoid part with an explosion-proof case, rather than the entire structure including the operating part as in the past, making the entire device smaller and lighter, easier to handle, and extremely easy to maintain. It can be made advantageous.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic braking force release device according to the present invention, in which Fig. 1 is an overall front view, Fig. 2 is an overall plan view, and Fig. 3 is an enlarged view of the main parts. The explanatory drawings and FIGS. 4A to 4D are a front view, a top view, a left side view, and a right side view of the explosion-proof case. In the figure, 1 is an automatic release device, 2 is a solenoid part,
3 is an operating part, 4 is an operating body, 8 is an operating wire, 13
is an explosion-proof case.

Claims (1)

[Scope of utility model registration request] The solenoid part that operates in response to a sensing command from a sensor that detects smoke, etc. and the actuating body that is locked and held in a non-operating position upon activation of the solenoid part are released, causing the actuating body to and an actuating section that automatically displaces the solenoid to an operating position to release the braking force, and the solenoid section is housed in an explosion-proof case that is shielded from the outside air in the installation atmosphere. Automatic release device.