JP2018104887A - Automatic closing device for fire door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic closing device for a fire door capable of bringing a latch mechanism into a release state manually and easily without using a fire door.SOLUTION: When a fire breaks out, an automatic closing device 1 for a fire door can automatically close a fire door by bringing a latch mechanism part 3 into a release state by a start part starting, and by releasing engagement of a latch 3a and an engaging member H of the fire door, and it can also manually close the fire door by bringing the latch mechanism part 3 into a release state by pulling the fire door in a closing direction and by releasing engagement of the latch 3a and the engaging member H of the fire door. In a housing 2, an opening 10 for release operation is provided, and an operation of bringing the latch mechanism part 3 into a release state can be performed from the outside through the opening 10 for release operation.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an automatic closing device for a fire door that normally keeps the fire door open and automatically closes the fire door when a fire occurs.

  2. Description of the Related Art An automatic closing device for a fire door (hereinafter also simply referred to as “automatic closing device”) includes a latch mechanism having a latch that engages with an engaging member of the fire door. At all times, the latch mechanism is fixed and the engagement between the latch and the fire door engaging member is maintained, and the fire door is held open. In the event of a fire, the latch mechanism is released based on the fire signal. In this state, the engagement between the latch and the engagement member of the fire door is released, and the fire door can be automatically closed (see, for example, Patent Document 1).

  In addition, this type of automatic closing device is provided in the case where the fire door cannot be automatically closed, and by pulling the fire door in the closing direction, the fire door engaging member pulls the latch in the release direction, thereby The latch mechanism is forcibly released to release the engagement between the latch and the engagement member of the fire door, and the fire door can be manually closed (see Patent Document 1).

Japanese Patent Publication No. 3-19350

  By the way, the automatic closing device may manually release the latch mechanism during construction, operation test, or the like. At that time, if the installation of the fire door is completed, the latch mechanism can be released using the fire door (pulling in the closing direction) as described above. However, if the installation of the fire door is not completed, the fire door cannot be used. The force that maintains the engagement with the force that pulls the latch in the release direction is set by adjusting the elasticity of an elastic member such as a coil spring, but when the latch mechanism is manually released, the fire door It is assumed that it will be used, and since the fire door must be kept open at all times, it is set so that a strong force works. For this reason, when the latch mechanism is manually released, a very strong force is required, and it is difficult to apply a pulling force in the release direction to the latch without using a fire door. If the installation of the fire receiver, etc. is completed and energization is possible, the latch mechanism can be automatically released by starting the solenoid or other activation means. The possible state is the final stage of the construction, and in many cases the energization is not possible at the stage where the fire door is not installed.

  That is, conventionally, it has been difficult for the automatic closing device to manually release the latch mechanism without using a fire door.

  In view of the above circumstances, an object of the present invention is to provide a fire door automatic closing device that can easily release a latch mechanism manually without using a fire door.

  The present invention includes a latch mechanism portion having a latch that engages with an engagement member of a fire door, and an activation portion that is activated based on a fire signal, and the latch mechanism portion is normally fixed. The latch is engaged with the engagement member of the fire door, and the fire door is held in an open state. On the other hand, when a fire occurs, the start mechanism is activated to release the latch mechanism portion. The engagement between the latch and the engagement member of the fire door can be released, the fire door can be automatically closed, and the latch mechanism is released by pulling the fire door in the closing direction. In the automatic door closing device for a fire door that releases the engagement between the latch and the engagement member of the fire door, and can manually close the fire door, the release operation opening is provided in the housing. Through the opening for the release operation. A self-closing device for a fire door, characterized in that from the outside enabled the operation of the release state of the latch mechanism portion Te.

  Further, according to the present invention, the opening for releasing operation can be inserted through a rod-like body from the outside, and the operation of bringing the latch mechanism portion into a released state by the inserted rod-like body is possible. There is an automatic closing device for a fire door characterized by being.

  Further, the present invention is the fire door automatic closing device, characterized in that a guide portion for guiding the rod-shaped body toward the operation target is provided inside the release operation opening.

  Further, the present invention further includes a latch fixing mechanism portion that puts the latch mechanism portion in a fixed state or a released state in the housing, and the release operation opening portion passes through the latch fixing mechanism portion from outside. It is provided in the position which can perform operation of the fire door closing device characterized by the above-mentioned.

  According to the present invention, the latch mechanism can be released from the outside of the housing through the release operation opening, and the latch mechanism can be manually released without pulling the latch. .

  Therefore, according to the present invention, it is possible to provide a fire door automatic closing device that can easily release the latch mechanism manually without using the fire door.

  In the present invention, since the latch mechanism can be easily released manually without using the fire door, it is necessary to attach the fire door to the fire door during construction until the installation of the fire door is completed. Even if the engagement member is temporarily engaged with the latch and the engagement member is detached from the latch and attached to the fire door after the installation of the fire door is completed in order to prevent the loss of the joint member, The required operation of removing the engaging member can be facilitated.

  Further, according to the present invention, the opening for release operation can be operated to bring the latch mechanism portion into the release state by a rod-like body inserted through the opening, so that the rod-like operation can be performed. The body can be used, and for example, a simple tool such as a driver usually held by an operator can be used during construction.

  Further, according to the present invention, since the release operation opening is provided at a position where the latch fixing mechanism can be operated from the outside through the opening, only the operation of operating the latch fixing mechanism is performed. Thus, the latch mechanism can be released, and the latch mechanism can be easily released manually.

It is an upper surface figure of the state where an example of the embodiment of the automatic closing device for fire doors of this invention was shown and the case upper part was removed. It is the perspective view which showed the same as the above and looked at the state which removed the intermediate chassis etc. from the state of FIG. 1 from diagonally upward. The operation rod 11 inserted through the release operation opening is indicated by a broken line. It is the front view of the whole apparatus which showed the same and showed the side of the side wall in which the latch opening part and the opening part for cancellation | release operation are provided in the side wall of a housing | casing. It is a bottom view of the state which showed the same and removed the housing | casing lower side. The operation rod 11 inserted through the release operation opening is indicated by a broken line. FIGS. 2A and 2C are diagrams corresponding to the B arrow view of FIG. 2, and each component when the latch mechanism is automatically released from the fixed state by the activation of the activation unit. These changes are shown separately in (a) to (c). (A) when the latch mechanism is in a fixed state, (b) when the latch fixing mechanism is released and the latch mechanism starts to change to a released state, (c) However, when the latch mechanism part will be in a cancellation | release state and the engagement with the engagement member of a fire door is cancelled | released, each is shown. FIG. 6 is a view corresponding to FIG. 5, showing the change of each component when the latch mechanism is manually changed from the fixed state to the released state by an operation through the release operation opening. In (a) and (b), the bar 11 for operation inserted through the opening for release operation is indicated by a broken line. The same as above, and (a) to (d) are all equivalent to the view of arrow B in FIG. 2, and the change when the latch mechanism is manually released by pulling the fire door in the closing direction. Are shown separately in (a) to (d). (A) is when the latch mechanism is in a fixed state, (b) is when the lever for manual release of the latch mechanism is in contact with the second release trigger of the latch fixing mechanism, (C), when the manual release lever pushes the second release trigger in the release direction, the latch fixing mechanism part starts to release, and the latch mechanism part starts to be released, (d) However, the latch fixing mechanism portion is in a released state, and the engagement with the engaging member of the fire door is released, respectively. FIG. 5 is a view corresponding to a partially enlarged view of FIG. 4 and showing another example of a latch fixing mechanism.

  An example of an embodiment of the automatic closing device of the present invention will be described with reference to FIGS.

  First, an outline of the configuration of the entire apparatus will be described.

  As shown in FIG. 1 and FIG. 2, the automatic closing device 1 (fire door automatic closing device 1) is a housing provided with a latch opening 2a through which a hook H which is an example of an engagement member of a fire door enters and exits. A latch mechanism portion 3 having a latch plate 3a which is an example of a latch that engages with a hook H of a fire door, and the latch mechanism portion 3 is fixed or released. In this state, the latch fixing mechanism portion 4 that holds or releases the engagement between the latch plate 3a and the hook H of the fire door, the solenoid 5 that is an example of an activation portion that is activated based on a fire signal, and the fire door are pulled. Accordingly, a holding force adjusting mechanism 8 for adjusting the holding force in the engaged state when the latch plate 3a is manually disengaged from the hook H of the fire door is provided. The automatic closing device 1 further includes an automatic release mechanism for automatically releasing the latch fixing mechanism portion 4 in conjunction with the activation of the solenoid 5 inside the housing 2. Is omitted.

  The automatic closing device 1 normally holds the latch mechanism portion 3 in a fixed state by the latch fixing mechanism portion 4, maintains the engagement between the latch plate 3 a and the hook H of the fire door, While maintaining the open state, in the event of a fire, the latch fixing mechanism 4 is released automatically by interlocking with the activation of the solenoid 5 based on the fire signal or manually by pulling the fire door in the closing direction. Thus, the latch mechanism 3 is changed to the released state, the engagement between the latch plate 3a and the hook H of the fire door is released, and the fire door can be closed.

  In the present embodiment, the latch plate 3a specifically has a hook-like engagement portion 3e, and the hook-like engagement portion 3e provides an opening side entrance in the latch opening 2a. By being positioned so as to be closed, the hook H on the fire door side is engaged.

  Furthermore, in this embodiment, the housing | casing 2 shall be divided into 2 parts up and down, as shown in FIG. 3, and shall consist of two parts, the housing | casing upper side 2b and the housing | casing lower side 2c. In addition, the latch opening 2a is provided over the entire length in the vertical direction on both side walls 2d and 2e of the housing upper side 2b and the housing lower side 2c. Further, an intermediate chassis 7 is provided between the case upper side 2b and the case lower side 2c, and the inside of the case 2 has a two-stage arrangement structure with the intermediate chassis 7 as a boundary. That is, the latch mechanism portion 3 and the latch fixing mechanism portion 4 are positioned below the intermediate chassis 7, and the solenoid 5 and the holding force adjusting mechanism portion 8 are positioned above the intermediate chassis 7. . Note that FIG. 1 shows mainly the upper-side components when the housing upper side 2b is removed from above, and FIG. 2 shows the state where the intermediate chassis 7 is further removed when seen from above. 1 mainly shows components on the lower stage side.

  Next, details of each component will be described.

[Latch mechanism]
As will be understood in detail from FIG. 2, the latch mechanism portion 3 includes a latch plate 3b provided with an engagement convex portion 3f and a release lever 3i in addition to the latch plate 3a (details will be described later). Is provided with a release lever-equipped plate 3c. It also has a latch arm 3d provided with an engagement recess 3g that engages with the engagement projection 3f of the locking plate 3b.

  The three plates 3a to 3c are provided so as to overlap each other in such a manner that the locking plate 3b is sandwiched between the latch plate 3a and the release lever-equipped plate 3c. It is provided so that rotation is possible. On the other hand, the latch arm 3d is provided at a position on the side (the upper side in the drawing) of the three plates 3a to 3c, and is provided in the housing 2 so as to be rotatable about another axis X2 whose position is fixed. It has been.

  As the three plates 3a to 3c rotate about the axis X1, the engaging portion 3e of the latch plate 3a is positioned so as to close the doorway of the latch opening 2a, and the hook H on the fire door side An engagement position (P1) where the engagement is possible, and a release position (P2) where the engagement with the hook H on the fire door is released and the release position (P2) is located so as to open the doorway of the latch opening 2a (See FIGS. 5A to 5C, etc.). On the other hand, the latch arm 3d rotates about the axis X2 to rotate in a direction (up and down in the drawing) to and away from the locking plate 3b, and the engagement recess 3g engages with the locking plate 3b. It is rotationally displaced so as to engage and disengage the convex portion 3f (see the figure).

  Here, in the three plates 3a to 3c, the latch plate 3a and the release lever-equipped plate 3c are fixedly connected. Further, the latch plate 3a and the locking plate 3b are separated in the rotation direction at the portions of the moving side adjustment piece 8a and the fixed side adjustment piece 8b (details will be described later) provided at the respective rotation ends. It is connected so that contact is possible. That is, the three plates 3a to 3c are provided in the housing 2 so as to be rotatable together about the axis X1 whose position is fixed.

  The three plates 3a to 3c are always biased toward the release position (P2) by a spring (not shown) such as a torsion spring, but the engagement recess 3g of the latch arm 3d The engaging projections 3f of the locking plate 3b are provided so as to stop the rotation of the locking plate 3b toward the release position (P2) as long as they are engaged with each other. Further, when the engaging recess 3g of the latch arm 3d engages with the engaging convex portion 3f of the locking plate 3b, the engaging portion 3e of the latch plate 3a is moved to the engaging position (P1). It is provided to be located.

  That is, the latch mechanism 3 controls the rotation and stop of the three plates 3a to 3c by engaging and disengaging the engagement recess 3g of the latch arm 3d and the engagement protrusion 3f of the locking plate 3b. The engaging portion 3e of the latch plate 3a can be held in an engagement position (P1) where the engagement with the hook H of the fire door is possible, and the hook H of the fire door can be released. It is provided so that it can be in a release state in which it is automatically rotated to the release position (P2) side.

[Latch fixing mechanism]
The latch fixing mechanism unit 4 operates in cooperation with the latch mechanism unit 3 to place the latch mechanism unit 3 in a fixed state or a released state, and to maintain or release the engagement between the latch plate 3a and the hook H of the fire door. Is. In the present embodiment, the toggle mechanism 4a is located on the side of the latch mechanism portion 3 and connected to the rotating end of the latch arm 3d, and can be changed between an extended state and a bent state.

  The toggle link mechanism 4a includes a first arm 4b that can rotate about an axis X3 fixed to the housing 2, and a second arm 4c that is rotatably connected to the first arm 4b by a joint portion 4d. The pivot end side of the latch arm 3d is rotatably coupled to the second arm 4c by a joint portion 4e. When the toggle link mechanism 4a is in the extended state, the latch arm 3d is positioned at a position where the engagement recess 3g engages with the engagement projection 3f of the locking plate 3b (see FIG. 5A, etc.). In the bent state, the latch arm 3d is provided as a link for positioning the engagement recess 3g at a position where the engagement recess 3g does not engage with the engagement projection 3f of the locking plate 3b (see FIG. 5C, etc.). Yes.

  In the toggle link mechanism 4a, the first and second arms 4b and 4c are constantly urged to the extension side by a spring 4h such as a torsion spring (see FIGS. 5A and 5B). If the arms 4b and 4c are in the extended state, the state is maintained. When both arms 4b and 4c are in the extended state, the latch mechanism portion 3 is in a state where the engagement concave portion 3g of the latch arm 3d and the engagement convex portion 3f of the locking plate 3b are engaged with each other. The rotation of the plate 3b is stopped, and the engagement portion 3e of the latch plate 3a is in a fixed state in which it is held at the engagement position (P1) where the engagement with the hook H of the fire door is possible. That is, the toggle link mechanism 4a holds the latch mechanism 3 in a fixed state by holding both arms 4b and 4c in an extended state.

  On the other hand, when the first and second arms 4b and 4c are changed to the refracted state against the urging force that urges the first arm 4b and the second arm 4c to the extension side, the latch arm 3d is interlocked with the engaging recess 3g and the locking plate 3b. It rotates to the side which cancels | releases engagement with the engaging convex part 3f, and the engagement state is cancelled | released. Thereby, the state in which the rotation of the locking plate 3b is stopped is released, and the engaging portion 3e of the latch plate 3a is rotated to the release position (P2) side. That is, the toggle link mechanism 4a changes the latch mechanism portion 3 to the released state by changing both arms 4b and 4c to the refraction state.

  The toggle link mechanism 4a is operated to cooperate with the solenoid 5 and an automatic release mechanism (not shown) and automatically change the latch mechanism 3 to the release state in conjunction with the activation of the solenoid 5. An automatic release trigger pin 4f, which is an example of a first release trigger, is provided on the joint 4d (see FIG. 2). Further, a hook-like trigger lever 4g for manual release, which is an example of a second release trigger that is manually operated to change the latch mechanism 3 to the release state by pulling the fire door, is provided with the second arm 4c. Is provided on the rotating end 4i side (see FIG. 4). Regardless of which trigger is operated, the first and second arms 4b and 4c can be changed to the refracted state, and the latch mechanism portion 3 can be changed to the released state. That is, the engaging portion 3e of the latch plate 3a can be turned to the release position (P2) side to release the engagement with the hook H of the fire door, and the hook H can be released.

[solenoid]
The solenoid 5 is activated based on the fire signal and operates to automatically release the latch mechanism portion 3 in cooperation with the latch fixing mechanism portion 4 and the automatic release mechanism (not shown). It has a plunger 5a that expands and contracts based on a fire signal. The automatic release mechanism (not shown) is biased by a spring or the like so as to be in a contracted state during operation, and the plunger 5a is always held in an extended state by a magnetic force, and the automatic release mechanism (not shown) operates. Is stopped (see FIG. 1). On the other hand, when a fire occurs, the solenoid 5 is energized to weaken the magnetic force, and the plunger 5a can be changed to the contracted state. At this time, the automatic release mechanism (not shown) operates to be in a contracted state, and the trigger pin 4f for automatic release of the toggle link mechanism 4a is released in the release direction (arrow A1 direction) while changing the plunger 5a to the contracted state. It is moved (see FIGS. 5A to 5C). As a result, the first and second arms 4b and 4c of the toggle link mechanism 4a change to the refraction state, and the latch mechanism portion 3 changes to the release state.

[Holding force adjustment mechanism]
The automatic closing device 1 can also manually release the latch mechanism portion 3 by pulling the fire door in the closing direction. The holding force adjusting mechanism 8 (see FIGS. 1 and 7) is for adjusting the force required for the manual operation, that is, the engagement holding force of the latch mechanism 3.

  The holding force adjusting mechanism 8 stands on the moving side adjusting piece 8a erected on the rotating side end of the latch plate 3a, and on the rotating side end of the locking plate 3b so as to face the moving side adjusting piece 8a. The fixed adjustment piece 8b provided, a coil spring 8c as an example of a spring that constantly urges the adjustment pieces 8a and 8b toward each other, and the adjustment pieces 8a and 8b penetrating the adjustment pieces 8a and 8b. 8b are connected to each other so as to be separable from each other in the rotational direction, and an adjustment screw 8d for adjusting the urging force by expanding and contracting the coil spring 8c is provided.

  Here, by pulling the fire door in the closing direction, the latch plate 3a engaged with the hook H of the fire door is released side (P2) side together with the plate 3c with a release lever fixedly connected thereto. Will be pulled in the direction of rotation. The pulling force urges the moving-side adjustment piece 8a of the latch plate 3a in the approaching direction and latches it to the fixed-side adjustment piece 8b of the locking plate 3b in a state where the rotation is stopped by the latch arm 3d. If the urging force of the coil spring 8c that stops the rotation of the plate 3a is overcome, the latch plate 3a rotates together with the release lever-equipped plate 3c toward the release position (P2). When the latch mechanism portion 3 is in a fixed state, the plate 3c with a release lever faces the trigger lever 4g for manual release of the toggle link mechanism 4a and is turned to the release position (P2) side. A release lever 3i is provided at a position to push the trigger lever 4g in the release direction (arrow A2 direction) (see FIG. 4). That is, if the latch plate 3a is overcome to the biasing force of the coil spring 8c and is rotated to the release position (P2) side together with the release lever-attached plate 3c, the release lever 3i pushes the trigger lever 4g in the release direction. Then, the toggle link mechanism 4a can be changed to the refracted state, and the latch mechanism part 3 can be changed to the released state (see FIGS. 7A to 7D).

  That is, the holding force adjusting mechanism 8 adjusts the biasing force of the coil spring 8c that biases the moving side adjusting piece 8a of the latch plate 3a and the fixed side adjusting piece 8b of the locking plate 3b in the approaching direction. It adjusts the force required to manually release the latch mechanism 3 using a fire door.

[Release operation opening]
As shown in FIGS. 2 to 4, the automatic closing device 1 is provided with a release operation opening 10 in the housing 2, and through the release operation opening 10, the inside of the housing 2 from the outside. The latch mechanism portion 3 can be operated to be released.

  In the present embodiment, the release operation opening 10 is provided on the side of the housing 2 on the side where the latch opening 2a is provided (specifically, the side wall 2e of the housing lower side 2c). In addition, the rod-like body 11 inserted through the opening can reach the latch fixing mechanism portion 4 and is provided at a position where the latch fixing mechanism portion 4 can be operated to release the latch fixing mechanism portion 4.

  Here, in the present embodiment, the latch fixing mechanism portion 4 is configured such that the front end surface of the rotating end portion 4i of the second arm 4c in the toggle link mechanism 4a is in a state where both arms 4b and 4c are in the extended state. It is provided in an arrangement facing the inside of the side wall 2e of the lower side 2c. As can be easily understood from FIGS. 3 and 4, the release operation opening 10 can be operated to release the rotating end 4 i of the second arm 4 c by the rod-like body 11 when it is in the extended state. It is provided in a possible position.

  In other words, the automatic closing device 1 is configured such that the pivotal end of the second arm 4c of the toggle link mechanism 4a in the extended state in the latch fixing mechanism portion 4 by the rod-like body 11 inserted from the outside through the opening 10 for the release operation. The part 4i can be operated to move in the release direction (in the direction of arrow A2), thereby changing the toggle link mechanism 4a from the extended state to the refracted state, and the latch mechanism part 3 Can be changed from the fixed state to the released state (see FIGS. 4 and 6A to 6C).

  Therefore, according to the automatic closing device 1 of the present embodiment, the release operation opening 10 is provided, so that the latch mechanism 3 is brought into the release state from the outside of the housing 2 through the release operation opening 10. The latch can be operated without pulling the latch plate 3a and without resisting the urging force of the coil spring 8c of the holding force adjusting mechanism 8 that holds the latch plate 3a in the engaged state. The mechanism unit 3 can be manually released. That is, the latch mechanism 3 can be easily released manually without using the fire door (even before the fire door is installed).

  In addition, in the automatic closing device 1 of this embodiment, since the latch mechanism part 3 can be easily released manually without using the fire door, it is necessary to complete the installation of the fire door at the time of construction. In the meantime, in order to prevent the hook H attached to the fire door from being lost, the hook H is temporarily engaged with the latch plate 3a, and after the installation of the fire door is completed, the hook H is detached from the latch plate 3a and attached to the fire door. Even if it makes it like that, the operation | work of the removal of the hook H required in that case can be made easy.

  Further, the release operation opening 10 is provided in the side wall 2e on the side where the latch opening 2a is provided, so that, for example, even after the automatic closing device 1 is installed in a state of being embedded in the wall. The latch mechanism 3 can be manually changed to the release state from the outside of the housing 2 through the release operation opening 10. In addition, the release operation opening 10 can be operated to bring the latch mechanism 3 into the release state by the rod-like body 11 inserted through the opening. A simple tool such as a driver can be used for the operation. Further, since the release operation opening portion 10 is provided at a position where the latch fixing mechanism portion 4 can be operated through the opening portion, the latch mechanism portion can be simply operated by releasing the latch fixing mechanism portion 4. 3 can be released, and the latch mechanism 3 can be manually released more easily. Further, the second arm 4c is rotated in the latch fixing mechanism portion 4 that is located on the inner side of the side wall 2d where the release operation opening 10 is provided. By setting it as the edge part 4i, the rod-shaped body 11 penetrated to the opening part 10 for cancellation | release operation can be easily reached to the rotation edge part 4i which is the operation object.

  Here, in the case of the present embodiment, the second arm 4c rotating end 4i is erected toward the bottom surface side of the casing 2, and when the toggle link mechanism 4a is in the extended state, A standing piece 4j that forms a tip surface substantially parallel to the side wall 2e is provided at the tip (see FIG. 3 and the like). As a result, when the rod-like body 11 inserted into the release operation insertion port 10 is operated to rotate the turning end 4i of the second arm 4c in the release direction (arrow A2 direction), the rod-like body 11 is raised. The operation can be performed by touching the side portion with the height of the piece 4j, and the operation can be facilitated.

  Next, when the operation of changing the latch mechanism portion 3 from the state in which the latch fixing mechanism portion 4 is held in the fixed state to the released state is performed automatically by the activation of the solenoid 5, the opening for releasing operation is performed. When performing by manual operation through 10, it will be described separately when performing by manual operation using a fire door.

[Automatic operation]
5 (a) to 5 (c) show how each component changes when the latch mechanism 3 is automatically changed from the fixed state to the released state by the activation of the solenoid 5. FIG. As shown to (a), when the latch mechanism part 3 exists in a fixed state, the engaging part 3e of the latch plate 3a exists in the engaging position (P1) engaged with the hook H of a fire door. This state is held by the toggle link mechanism 4a of the latch fixing mechanism unit 4 being held in the extended state. When the solenoid 5 is activated, the plunger 5a can be changed from the extended state to the reduced state. At that time, an automatic release mechanism (not shown) that has stopped the operation when the plunger 5a is extended operates to change the plunger 5a to the contracted state, while the trigger pin 4f of the toggle link mechanism 4a is released in the release direction (arrow). A1 direction). Due to the movement of the trigger pin 4f in the release direction, the first and second arms 4b and 4c of the toggle link mechanism 4a change from the stretched state to the refracted state as shown continuously in (b) and (c). At the same time, the latch arm 3d rotates its engagement recess 3g to a position (upward in the drawing) where the engagement recess 3g does not engage with the engagement projection 3f of the lock plate 3b, thereby rotating the release position of the lock plate 3b. Is released, and the latch plate 3a, the locking plate 3b, and the release lever-attached plate 3c are rotated to the release position (P2) side (clockwise in the drawing) to engage the latch plate 3a. The part 3e is rotated until it reaches the release position (P2). Thereby, the latch mechanism part 3 will be in a cancellation | release state, and the hook H of a fire door will be released.

[Manual operation through the opening for release operation]
6 (a) to 6 (c) show how each component changes when the latch mechanism 3 is manually changed from the fixed state to the released state by an operation through the opening 10 for the releasing operation. However, only the operation position with respect to the latch fixing mechanism 4 is changed, and the operation itself of the latch mechanism 3 and the latch fixing mechanism 4 is the same as that of the automatic operation described above. That is, (a) shows a state when the latch mechanism unit 3 is in a fixed state, and the latch mechanism unit 3 and the latch fixing mechanism unit 4 are the same as the case shown in FIG. In the same state. When the latch mechanism 3 is manually released from the outside through the release operation opening 10 by the rod-like body 11, the rod-like body is inserted into the release operation opening 10 from the outside of the housing 2 as shown in FIG. 11 is inserted toward the rotation end 4i of the second arm 4c in the toggle link mechanism 4a to be operated, and the inserted rod-like body 11 is toggled to the second arm 4c at the rotation end 4i. It is made to contact the position (for example, the side part of the standing piece 4j) which can be rotated in the release direction (arrow A2 direction) of the mechanism 4a. Then, as shown in (b), by rotating the rod-like body 11 and pushing the rotation end 4i, the second arm 4c is rotated in the release direction (arrow A2 direction). Then, the first and second arms 4b and 4c of the toggle link mechanism 4a are changed to the refractive state. As a result, as shown continuously in (b) and (c), the engaging portion 3e of the latch plate 3a is formed as described with reference to FIGS. 5 (b) and (c). The latch mechanism unit 3 can be brought into the released state by rotating to the release position (P2).

[Manual operation using a fire door]
FIGS. 7A to 7D show the change of each component when the latch mechanism unit 3 is manually changed from the fixed state to the released state by pulling the fire door. (A) shows a state when the latch fixing mechanism portion 4 is in a fixed state, and the latch mechanism portion 3 and the latch fixing mechanism portion 4 are the same as those shown in FIG. Is in a state. When manually releasing the latch mechanism 3 by pulling the fire door, the latch plate 3a engaged with the hook H of the fire door is released together with the release lever-attached plate 3c by pulling the fire door. It will be pulled in the direction of rotating to the position (P2) side, and will be pulled in the direction of separating from the locking plate 3b in the state where the rotation is stopped in the rotating direction. At that time, if the latch plate 3a is pulled with a force that exceeds the biasing force of the coil spring 8c that biases the moving side adjustment piece 8a of the latch plate 3a and the fixed side adjustment piece 8b of the locking plate 3b in the approaching direction, ( As shown in succession to b) to (d), the latch plate 3a rotates to the release position (P2) side together with the release lever-attached plate 3c. Accordingly, the release lever 3i of the plate 3c with the release lever pushes the trigger lever 4g of the toggle link mechanism 4a in the release direction (arrow A2 direction), and the first and second arms 4b and 4c of the toggle link mechanism 4a. Is changed from the stretched state to the refractive state. That is, as described with reference to FIGS. 5B and 5C, the latch mechanism portion 3 is rotated by rotating the engaging portion 3e of the latch plate 3a to the release position (P2). Can be released.

  As mentioned above, although an example of this embodiment was explained referring to Drawing 1 thru / or Drawing 7, this invention is not limited to the composition of the above-mentioned embodiment, and suitably in the range of the gist of the invention Its configuration can be changed.

  For example, the number of release operation openings 10 may be plural. Further, the release operation opening 10 is preferably provided on the side wall 2e on the side where the latch opening 2a is provided, but may be provided on the other side wall or on the top wall or the bottom wall. You may make it provide.

  Further, a guide portion that guides the inserted rod-shaped body toward the operation target may be provided inside the release operation opening 10. In that case, the shape of the guide portion can be a cylindrical shape. By providing such a guide portion, the inserted rod-shaped body can be easily made to reach the operation target, and contact with a portion other than the operation target can be prevented. Furthermore, when making the shape of a guide part cylindrical, in addition to it, it can be made into a taper shape toward the operation target. By adopting such a tapered shape, it is possible to accurately guide toward the operation target.

  Further, the standing piece 4j provided on the second arm 4c in the toggle link mechanism 4a may be simply a convex portion, for example, a rod-like portion such as the trigger pin 4f.

  Further, in the above-described embodiment, the standing piece 4j is formed with a front end surface substantially parallel to the side wall 2e of the housing 2 when the toggle link mechanism 4a is extended, but as shown in FIG. It is good also as what forms the inclined front end surface so that it may function as a cam surface which rotates the arm 4c of 2 in a cancellation | release direction. That is, as the inclined surface that functions to rotate the second arm 4c in the direction of the arrow A2 by pushing the rod-like body 11 inserted through the release operation opening 10 straight in the direction of the arrow A3, the tip thereof It is good also as what forms a surface. In this way, the toggle link mechanism 4a can be released simply by pushing straight from the front without rotating the rod-shaped body 11.

  1: Automatic closing device for fire door 2: Housing 2a: Latch opening 2b: Upper housing 2c: Lower housing 2d: Side wall 2e: Side wall 3: Latch mechanism 3a: Latch plate 3b: Locking plate 3c: Plate with release lever 3d: Latch arm 3e: Engagement portion 3f: Engagement projection 3g: Engagement recess 3i: Release lever 4: Latch fixing mechanism 4a: Toggle link mechanism 4b: First arm 4c: Second Arm 4d: Joint portion 4e: Joint portion 4f: Trigger pin 4g: Trigger lever 4h: Spring 4i: Rotating end 4j: Standing piece 5: Solenoid 5a: Plunger 7: Intermediate chassis 8: Holding force adjusting mechanism portion 8a: Moving side Adjustment piece 8b: Fixed adjustment piece 8c: Coil spring 8d: Adjustment screw 10: Opening opening 11: Rod-shaped body X ~X3: axis H: fire door of the hook

Claims (4)

The housing includes a latch mechanism portion having a latch that engages with an engagement member of the fire door, and an activation portion that is activated based on a fire signal. And the engagement member of the fire door is maintained, the fire door is held in an open state, while in the event of a fire, the start mechanism is activated to release the latch mechanism, The engagement between the latch and the engagement member of the fire door can be released, the fire door can be automatically closed, and the latch mechanism is released by pulling the fire door in the closing direction, In the automatic closing device for a fire door capable of releasing the engagement between the latch and the engagement member of the fire door and manually closing the fire door,
An automatic closing device for a fire door, wherein a release operation opening is provided in the casing, and the latch mechanism is externally released through the release operation opening.   The release operation opening can be inserted through a rod-shaped body from the outside, and the latch mechanism can be operated to be released by the inserted rod-shaped body. The automatic closing device for a fire door according to claim 1.   The automatic closing device for a fire door according to claim 2, wherein a guide portion for guiding the rod-shaped body toward an operation target is provided inside the opening portion for release operation.   The housing further includes a latch fixing mechanism for fixing or releasing the latch mechanism, and the opening for release operation is a position through which the operation of the latch fixing mechanism can be operated from the outside. The automatic closing device for a fire door according to any one of claims 1 to 3, wherein the automatic closing device is provided on the fire door.

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