JP5576761B2 - Automatic closing device for fire door - Google Patents

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.

  The automatic closing device for a fire door generally includes a latch having an engaging portion that engages with an engaging member of the fire door, and is normally engaged with the engaging portion of the latch and the engaging member of the fire door. To hold the fire door in an open state, and in the event of a fire, the engagement state between the latch engaging portion and the fire door engaging member is interlocked with the operation of the starting means such as a solenoid. The fire door can be automatically closed by its own weight.

  This type of automatic closing device can also release the latch engagement state by pulling the fire door in the closing direction in case the fire door cannot be closed automatically. In other words, in the conventional automatic closing device, in general, the latch is hooked on the twill portion of the stopping piece, and the engaged state is maintained. In the case of automatic release, the stop piece is released by a trigger plate, and in the case of manual operation, the latch is pulled to remove the hook from the twill portion of the stop piece (see, for example, Patent Document 1).

Japanese Patent Publication No. 3-19350

  As described above, the latching state in the conventional automatic closing device is released by the trigger plate in the automatic case, and in the manual operation, the latch is directly removed from the tread portion of the restraining piece. .

  Therefore, since the conventional automatic closing device moves the stop piece by different parts automatically and manually when releasing the latch engagement, the dimensions related to the trigger plate and the stop piece, the latch and the stop piece The dimension related to Aya was severe.

  In view of the above circumstances, an object of the present invention is to provide an automatic closing device for a fire door that is easy to design and manufacture.

The present invention relates to a latch mechanism including a latch having an engaging portion that engages with an engaging member of a fire door, and latch fixing that holds the engagement between the engaging portion of the latch and the engaging member of the fire door. Latch release that automatically releases the engagement holding state of the engagement portion of the latch and the engagement member of the fire door by the latch fixing mechanism portion based on the activation of the mechanism portion, the activation portion, and the activation portion The automatic door closing device for a fire door is provided with a mechanism portion and configured to be able to release the engagement holding state between the latch engagement portion and the fire door engagement member by the latch fixing mechanism portion. The latch fixing mechanism has a first arm and a second arm rotatably connected to the first arm, and the first arm and the second arm are connected to each other. provided to the joint portion, the first trigger that operates when releasing the engagement state of the latch automatically , Provided to the second arm, hand and made of a toggle link mechanism and a second trigger that operates when releasing the engagement state of the latch, also the latch mechanism, said The latch is provided so as to be rotatable, and is provided so as to rotate in a predetermined direction by pulling the fire door in the closing direction, and rotates in a predetermined direction together with the rotating latch. And a release lever that pushes the second trigger. When manually releasing the latch, the release lever is rotated by pulling the fire door in the closing direction. The automatic trigger device for a fire door is characterized in that the second trigger is operated thereby .

Further, the present invention is the automatic closing device for a fire door, wherein the release lever rotates about the same axis as the latch .

  According to this invention, the latch fixing mechanism portion includes the first trigger for automatically releasing the latch engagement holding state and the second trigger for manually releasing the latch, whereby one latch fixing mechanism is provided. Depending on the part, it is possible to deal with both automatic release and manual release of the latch holding state, increasing the degree of freedom in device design, and increasing the dimensional tolerance during manufacturing.・ Manufacturing can be facilitated.

  Therefore, according to the present invention, an automatic closing device for a fire door that can be easily designed and manufactured can be provided.

An example of embodiment of the automatic closing device for fire doors of this invention is shown, (a) is a top view in the state which removed the case upper side, (b) is a top view in the state which removed the case upper side and the intermediate chassis. (A) and (b) are both side views of the starting portion, the intermediate chassis, and the slide mechanism portion, and (a) is a state when the plunger of the starting portion is always extended, b) is a case where the plunger of the starting portion at the time of starting is contracted and the trigger pin for automatic release of the latch fixing mechanism portion is displaced to the release position. The same as above, (a) to (c) are plan views with the upper case and the intermediate chassis removed. The latch mechanism is automatically released from the engaged holding state and the fire door hook is released. (A) is when the latch mechanism is in the engagement holding state, (b) is the release state of the latch mechanism by the activation of the activation unit. (C) is the case where the latch mechanism portion is released from the engagement holding state by the activation of the starting portion, and the fire door hook is released from the latch mechanism portion. The same as above, (a) to (d) are plan views with the upper case and the intermediate chassis removed, and manually release the latch mechanism from the engaged state to release the fire door hook. (A) is when the latch mechanism is in the engagement holding state, (b) is a lever for manually releasing the latch mechanism and the latch fixing mechanism is (C) and (d) when the manual release lever of the latch mechanism part pushes the trigger lever for manual release of the latch fixing mechanism part, and latches when it is in contact with the manual release trigger lever. This is when the fixing mechanism portion changes to the released state, the latched and held state of the latch mechanism portion is released, and the fire door hook is released from the latch mechanism portion.

  An embodiment of an automatic closing device for a fire door according to the present invention will be described with reference to FIGS.

  First, the overall outline will be described.

  A fire door automatic closing device 1 includes a case 2 with a latch mechanism 3, a latch fixing mechanism 4, a solenoid 5 as an example of an activation unit, a latch release mechanism 6, an intermediate chassis 7, and the like. In the automatic door closing device 1 for a fire door, the case 2 is vertically divided into two. The case 2 is formed with an opening 2a through which an engagement member of a fire door (not shown), for example, a hook H is made to enter and exit. Further, the case 2 is divided into two parts in the vertical direction with the intermediate chassis 7 as a boundary, and a slide mechanism described later on the latch mechanism part 3, the latch fixing mechanism part 4, and the latch release mechanism part 6 below the intermediate chassis 7. The portion 6a and the like are positioned, and the solenoid 5 and the like are positioned above the intermediate chassis 7.

  The automatic door closing device 1 for a fire door can always hold the engagement by the latch mechanism 3 with the hook H of the fire door located in the opening 2a, and can keep the fire door in an open state. In the event of a fire, holding the engagement by the latch mechanism portion 3 with the hook H of the fire door either automatically based on the activation of the solenoid 5 by a fire signal or manually by pulling the fire door in the closing direction The state is released, the hook H is released from the latch mechanism portion 3, and the fire door can be closed.

  Next, details of each component will be described.

  The latch mechanism portion 3 includes a latch plate 3a having a hook-like engagement portion 3e that engages with the hook H of the fire door. Specifically, the latch mechanism portion 3 rotates together with an axis X1 fixed to the case 2 as an axis. It consists of three plates consisting of a movable latch plate 3a, a locking plate 3b, and a release lever-attached plate 3c, and a latch arm 3d that can rotate about an axis X2 fixed to the case 2. In this latch mechanism part 3, the three plates rotate together about the axis X1, but the engaging part 3e engages with the hook H of the fire door by the rotation of the latch plate 3a. It is possible to rotate and displace between an engagement position (P1) where the joint can be held and a release position (P2) where the engagement with the hook H can be released (FIGS. 3a to 3a). c and FIGS. 4a to 4d), and the three plates are always urged toward the release position (P2) side of the engaging portion 3e (clockwise in the drawing) by a spring (not shown). The stop plate 3b and the latch arm 3d cooperate, and the engagement projection 3f of the latch plate 3b and the engagement recess 3g of the latch arm 3d are engaged and disengaged as the three plates rotate. The plate can be turned and stopped. Note that the latch arm 3d is constantly urged toward the three plate sides (downward in the drawing) by a spring (not shown).

  The latch fixing mechanism portion 4 cooperates with the latch mechanism portion 3 to hold the latch plate 3a in the engagement holding position and fix the latch mechanism portion 3 in the engagement holding state. More specifically, it is composed of a toggle link mechanism 4a that is connected to the pivot end of the latch arm 3d and can be changed between an extended state and a bent state.

  Specifically, the toggle link mechanism 4a includes a first arm 4b that can rotate about an axis X3 fixed to the case 2, and a second arm that is rotatably connected to the first arm 4b by a joint portion 4d. 4c, the pivot end of the latch arm 3d is connected to the second arm 4c so as to be pivotable by the joint portion 4e. When the latch arm 3d is in the extended state, the latch arm 3d is engaged with the engaging recess 3g. Is positioned at a position where it engages with the engaging projection 3f of the locking plate 3b (FIGS. 3a and 4a), and when it is in a bent state, the engaging recess 3g of the latch arm 3d is engaged with the locking plate 3b. It is positioned at a position where it does not engage with the convex portion 3f (FIGS. 3c and 4d), and is always urged in the extending direction by a spring (torsion spring) 4h provided on the axis X3 portion, In the latch mechanism 3 If the engaging projection 3f of the locking plate 3b is in a position where it engages with the engaging recess 3g of the latch arm 3d, that is, if the engaging portion 3e of the latch plate 3a is in the engagement holding position, the extended state Is maintained, and the engagement recess 3g of the latch arm 3d is kept engaged with the engagement projection 3f of the locking plate 3b, that is, the engagement portion 3e of the latch plate 3a is in the engagement holding position. The latch mechanism 3 is fixed in the engaged and held state. The toggle link mechanism 4a cooperates with the latch release mechanism 6 to provide a first trigger for changing from the extended state to the refractive state in order to automatically release the engagement holding state of the latch mechanism unit 3. As an example, a trigger pin 4f for automatic release is provided upright on the joint portion 4d.

  The solenoid 5 has a plunger 5a that expands and contracts based on a fire signal or the like, and cooperates with the latch release mechanism 6 to automatically release the engagement holding state of the latch mechanism unit 3. Normally, the plunger 5a is held in an extended state by a magnetic force (FIG. 2a). In a fire, the magnetic force is weakened by energization so that the plunger 5a can be contracted. 6 and is shortened by being pressed by the starting lever 6m (FIG. 2b). Reference numeral 5b denotes a spring for returning the plunger 5a to the extended state.

  The latch release mechanism portion 6 cooperates with the solenoid 5 to automatically release the latch holding state of the latch mechanism portion 3, but in the longitudinal direction on the intermediate chassis 7 as an example of the mounting plate. The first and second release plates 6b and 6c are mounted so as to be slidably overlapped with each other. The latch 5 is latched by the latch fixing mechanism 4 in conjunction with the movement of the solenoid 5 toward the contracted side of the plunger 5a. A slide mechanism 6a that operates so as to release the engagement holding state of the mechanism unit 3 is included.

  In the slide mechanism 6a, the first release plate 6b is provided with an activation lever 6m that passes through the intermediate chassis 7 and comes into contact with the tip of the plunger 5a of the solenoid 5 (FIGS. 2a and 2b), and the opposite side thereof. A release lever 6n that comes into contact with the trigger pin 4f of the toggle link mechanism 4a is erected (FIGS. 2a and 2b). In addition, a coil spring 6p is provided between the first release plate 6b and the second release plate 6c to apply a biasing force in a direction in which both plates approach each other along the length direction of both plates. When the plunger 5a in the extended state of the solenoid 5 is in contact with the activation lever 6m of the first release plate 6b, the first release plate 6b and the second release plate 6c are separated by 6q in the length direction. (The hooking portion 3h of the latch plate 3a hooks the upright piece 6r of the second release plate 6c and pulls the second release plate 6c so as to be separated 6q from the first release plate 6b). The spring 6p is in an extended state, and the urging force due to the restoring force acts as a force for pressing the plunger 5a by the activation lever 6m. (FIG. 2a), when the plunger 5a changes to the contracted state, the first release plate 6b slides in the direction approaching the second release plate 6c, that is, the arrow A1 direction by the urging force of the coil spring 6p. At this time, the release lever 6n of the first release plate 6b pulls the trigger pin 4f of the toggle link mechanism 4a in the direction of the arrow A1 (FIG. 2b) to change the toggle link mechanism 4a from the extended state to the refracted state. The latch arm 3d rotates in the release direction (upward in the drawing), and the engagement of the engagement recess 3g of the latch arm 3d and the engagement projection 3f of the locking plate 3b is released (FIGS. 3a to 3c). ).

  That is, the slide mechanism 6a in the latch release mechanism unit 6 can change the toggle link mechanism 4a of the latch fixing mechanism unit 4 from the extended state to the refracted state when the solenoid 5 is activated and the plunger 5a is contracted. When the solenoid 5 is activated, the latch holding mechanism 3 can automatically release the engagement holding state of the fire door with respect to the hook H.

  Furthermore, the automatic door closing device 1 for a fire door is not only capable of automatically releasing the engagement holding state of the fire door with respect to the hook H by the latch mechanism 3, but also to do so manually. It is possible to do.

  Specifically, a release lever 3i for manual release is provided at the rotating end of the plate 3c with a release lever of the latch mechanism unit 3, and the toggle link mechanism 4a is refracted from an extended state. A trigger lever 4g for manual release as an example of the second trigger to be changed to the state is provided on the free end side of the second arm 4c, and the two cooperate with each other to manually engage the latch mechanism portion 3. The holding state can be released, that is, by pulling the fire door, the latch plate 3a engaged with the hook H and the engaging portion 3e is released (clockwise in the drawing). At the same time, the release lever plate 3c also rotates. At this time, the release lever 3i of the release lever plate 3c pushes the trigger lever 4g of the toggle link mechanism 4a. Tog The link mechanism 4a is changed from the extended state to the refracted state, the latch arm 3d rotates in the release direction (upward in the drawing), the engagement of the engagement recess 3g and the engagement projection 3f is released, and the latch The engagement holding state of the fire door with respect to the hook H by the mechanism unit 3 can be released (FIGS. 4a to 4d).

  Here, as described above, the automatic door closing device 1 for a fire door can release the engagement holding state of the fire door with respect to the hook H by the latch mechanism 3 either automatically or manually. The toggle link mechanism 4a constituting the latch fixing mechanism unit 4 is provided with a trigger pin 4f serving as an automatic release trigger and a trigger lever 4g serving as a manual release trigger separately, that is, one latch fixing mechanism. 4 to release the engagement between the engagement convex portion 3f and the engagement concave portion 3g by rotating the latch arm 3d in the release direction (upward in the drawing) regardless of whether the release is performed automatically or manually. Since the latch fixing mechanism portion 4 is provided separately from the latch mechanism portion 3, the degree of freedom in device design is expanded and the dimensional tolerance at the time of manufacture can be made larger than before. .

  Note that the automatic door closing device 1 for a fire door is provided with a force required to release the latch mechanism portion 3 when the latch mechanism portion 3 is released from the hook holding state of the fire door manually, that is, the engagement holding force of the latch mechanism portion 3. A holding force adjusting mechanism 8 for adjusting is further provided. The holding force adjusting mechanism 8 includes a moving adjustment piece 8a erected at the rotation end of the latch plate 3a and a fixed adjustment piece 8b erected at the rotation end of the locking plate 3b. And a coil spring 8c that constantly urges both the adjusting pieces 8a and 8b in the close-contact direction, and an expansion / contraction mechanism using a screw 8d that expands and contracts the coil spring 8c and adjusts the urging force in the close-contact direction. When the engagement holding state is manually released, the moving side adjustment piece 8a is moved in the contact direction acting on the fixed side adjustment piece 8b of the locking plate 3b by the coil spring 8c as the latch plate 3a rotates. The urging force is overcome and separated from the fixed side adjustment piece 8b of the locking plate 3b, but the force required for the separation, that is, the force required to manually release the engagement holding state, The holding force adjusting mechanism 8c can adjust the biasing force in the contact direction by the coil spring 8c acting on the space 8e between the moving side adjusting piece 8a and the fixed side adjusting piece 8b by rotating the screw 8d. It has become.

  Finally, regarding the operation of each component when releasing the latch mechanism 3 from the engagement holding state and releasing the hook of the fire door, when releasing the engagement holding state automatically or manually This will be explained separately.

[Auto release]
FIGS. 3A to 3C show the change in each configuration when the latch mechanism 3 is automatically released from the engaged and held state and the hook of the fire door is released. As shown in FIG. 3A, when the latch mechanism portion 3 is in the engagement holding state, the latch plate 3a is in a position (P1) where the engagement portion 3e engages with the hook H of the fire door. This state is maintained when the engagement convex portion 3f of the locking plate 3b and the engagement concave portion 3g of the latch arm 3d are engaged and the toggle link mechanism 4a to which the latch arm 3d is coupled is in the extended state. Yes. When the solenoid 5 is activated, the plunger 5a changes from the extended state of FIG. 2A to the contracted state of FIG. 2B, and the first release plate 6b in the slide mechanism 6 moves in the A1 direction and is released. The lever 6n moves the trigger pin 4f of the toggle link mechanism 4a in the direction of the arrow A1. That is, when the solenoid 5 is activated, the toggle link mechanism 4 is extended by the movement of the trigger pin 4f in the direction of the arrow A1 by the first release plate 6b as shown in FIGS. 3B and 3C continuously. And the latch arm 3d rotates to a position (upward in the drawing) where the engagement recess 3g does not engage with the engagement projection 3f of the locking plate 3b. The engagement holding state is released by disengagement, and the latch plate 3a is rotated in the release direction (clockwise in the drawing) together with the locking plate 3b and the release lever-attached plate 3c by the urging force of a spring (not shown). The engaging portion 3e reaches the position (P2) where the hook H of the fire door is released, and the hook H of the fire door is released from the latch mechanism portion 3.

[Manual release]
4 (a) to 4 (d) show how each component changes when the latch mechanism 3 is manually released from the engaged and held state and the hook H of the fire door is released. . As shown in FIG. 4A, when the latch mechanism portion 3 is in the engagement holding state, each configuration is in the same state as in the automatic release. To manually release the latch holding state of the latch mechanism portion 3, the fire door is pulled, and the latch plate 3a is pulled by the hook H in the release direction (clockwise in the drawing) via the engagement portion 3e. In this case, the latch plate 3a rotates in the release direction (clockwise in the drawing) together with the release lever-attached plate 3c as shown in FIGS. 4B to 4D continuously. Then, the release lever 3i of the release lever-equipped plate 3c pushes the trigger lever 4g of the toggle link mechanism 4, thereby changing the toggle link mechanism 4 from the extended state to the refracted state. Through a similar change, the engaging portion 3e reaches the position (P2) where the hook H of the fire door is released, and the hook H of the fire door is released from the latch mechanism portion 3.

1: Automatic closing device for fire door 2: Case 3: Latch mechanism 3a: Latch plate 3b: Locking plate 3c: Plate with release lever 3d: Latch arm 3e: Engagement part 3f: Engagement convex part 3g: Engagement Recess 3h: Hook 3i: Release lever 4: Latch fixing mechanism 4a: Toggle link mechanism 4b: First arm 4c: Second arm 4d: Joint 4e: Joint 4f: Trigger pin 4g: Trigger lever 4h: Spring 5 : Starter 5a: plunger 5b: spring 6: latch release mechanism 6a: slide mechanism 6b: first release plate 6c: second release plate 6m: starter lever 6n: release lever 6p: spring 6q: separation 6r: standing Piece 7: Intermediate chassis 8: Holding force adjustment mechanism 8a: Moving adjustment piece 8b: Fixed adjustment piece 8c: Sprinkle 8d: Screw 8e: Between X1 to X3: Shaft H: Fire door hook

Claims (2)

A latch mechanism portion including a latch having an engagement portion that engages with an engagement member of the fire door; a latch fixing mechanism portion that holds the engagement between the engagement portion of the latch and the engagement member of the fire door; An activation part, and a latch release mechanism part that automatically releases the engagement holding state between the latch engagement part and the fire door engagement member by the latch fixing mechanism part based on the activation of the activation part; An automatic closing device for a fire door configured to be able to release the engagement holding state between the latch engagement portion and the engagement member of the fire door by the latch fixing mechanism portion,
The latch fixing mechanism portion includes a first arm and a second arm rotatably connected to the first arm, and a joint portion between the first arm and the second arm. A first trigger that operates when the latch is automatically released, and a second trigger that is provided on the second arm and operates when the latch is manually released. Comprising a toggle link mechanism having two triggers ,
In addition, the latch mechanism portion is provided so that the latch can be rotated, and is provided to rotate in a predetermined direction by pulling the fire door in the closing direction. A release lever that rotates in a predetermined direction together with the latch and pushes the second trigger is further included, and when the engagement state of the latch is manually released, the fire door is pulled in the closing direction. The automatic closing device for a fire door is characterized in that the release lever is rotated by this to operate the second trigger . The automatic closing device for a fire door according to claim 1, wherein the release lever rotates about the same axis as the latch .