JPH031570Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention is a method for holding a fire door in a fixed state through a hook or other hook provided on the fire door, or for releasing this fixation. This relates to locking and unlocking devices used for locking and unlocking devices.

``Prior Art'' The locking/unlocking device described above is used by being fixed to the wall of a building, etc., and has a hook-shaped claw plate, and under normal conditions, the fire door is locked by the hook plate. It remains latched (locked) to the board, and in the event of an emergency such as a fire, the non-latching member is released (unlocked) from the claw plate, which opens the fire door and closes the passage. In this type of device, the above-mentioned unlocking operation is usually performed electrically using a solenoid, etc., and the fire door is opened in conjunction with a fire alarm, etc., and the passage is closed. There is.

By the way, in general, the above-mentioned devices have a mechanism that allows the fire door to be forcibly opened manually, in case the electrical opening means breaks down, such as when an electrical cable breaks in the event of a fire. (tentatively named release mechanism) is provided.
As such devices, those shown in FIGS. 4 to 6 are conventionally known.

In FIGS. 4 to 6, only essential parts of the forced opening mechanism are shown to make it clear. The device shown in these figures is housed inside a casing 1, and one side of the casing 1 (the upper part in the figures) has a locking member 2 attached to a fire door. An opening 1a is formed. Further, inside the casing 1, a claw plate 3 and a locking plate 4 are rotatably provided so as to overlap each other by the same rotation shaft 5. The nail plate 3 is
As shown in the figure, a long arm portion 3a and a short arm portion 3 following it.
It is a substantially J-shaped plate-like member consisting of a hook portion 3c provided at the tip side of the short arm portion 3b,
A notched cam portion 3d is formed at the tip of the short arm portion 3a. As described above, the cam portion 3d is
The tip of the short arm portion 3b is shaped such that the dimension from the rotating shaft 5 gradually decreases from the hook portion 3c side to the other side. On the other hand, an engagement plate part 3e is formed at the outer end (lower part in the figure) near the tip of the long arm part 3a of the claw plate 3 so as to stand up in a direction substantially perpendicular to the plate surface of the long arm part 3b. ing.

Further, the locking plate 4 is a plate-like member formed in a substantially L-shape, and has an engagement stepped portion 4b formed at the tip of the short arm portion 4a. This engagement step portion 4b is formed to face the opposite side of the hook portion 3c of the claw plate 3, and the dimension from the rotation shaft 5 to the tip portion is approximately the same as the dimension to the tip of the cam portion 3d. Or it is formed slightly smaller. On the other hand, the hanging plate 4
An engaging plate portion 4d is formed in the vicinity of the tip of the long arm portion 4c at a position slightly protruding from the outer side of the engaging plate portion 4d so as to rise approximately perpendicularly to the plate surface of the long arm portion 4c. It can be superimposed on the engagement plate portion 3e of No. 3.

A female screw hole (not shown) is bored in the center of the engagement plate part 4d of the locking plate 4, and a penetration hole with a diameter slightly larger than that of the female screw hole is provided in the center of the engagement plate part 3e of the claw plate 3. A hole (not shown) is bored, and a screw 6 is screwed into the female screw hole through the through hole from the upper surface side of the engagement plate portion 3e. A coil spring 7 is attached to this screw 6,
One end thereof is brought into contact with the upper surface of the engaging plate portion 3e of the claw plate 3, and the other end thereof is secured to the head 6a of the screw 6. Therefore, the engagement plate portion 3e of the claw plate 3 is always urged by the coil spring 7 toward the engagement plate portion 4d.

The claw plate 3 and the catch plate 4 are rotatably supported on the rotation shaft 5 as described above, and the hook portion 3c is directed outward from the opening 1a of the casing 1 by means of a spring (not shown). It is biased in the direction of release (counterclockwise in the figure).

Further, a rotation shaft 8 parallel to the rotation shaft 5 is attached inside the casing 1. An L-shaped plate-shaped stopper 9 is rotatably supported on the rotation shaft 8, and is always urged clockwise in the figure by a spring (not shown). The tip of the short arm portion 9a of this stopper 9 is connected to the engagement step portion 4 of the locking plate 4.
The cam portion 3d of the claw plate 3 can be engaged with the cam portion 3d of the claw plate 3.
It is coming into contact with the On the other hand, Stoppa 9
The tip of the long arm portion 9b is engaged with an unlocking mechanism (not shown), and the direction in which the stopper 9 disengages from the engagement step portion 4b by the operation of a solenoid or the like of the unlocking mechanism ( It is designed to be rotated (counterclockwise in the figure).

Next, the operation of the above conventional device will be explained.

First, Figure 4 shows the latched member 2 of the fire door during normal times.
In this state, the stopper 9 engages with the engagement stepped portion 4b of the locking plate 4 to restrict the counterclockwise rotation of the locking plate 4. In addition, a counterclockwise force is applied to the hook plate 3 from the hooked member 2 to the hook portion 3c, but the coil spring 7 generates a sufficient elastic force to prevent the claw plate 3 from rotating relative to the locking plate 4, thereby maintaining the locked state of the locked member 2.

In addition, in the event of an emergency such as a fire, a signal to open the fire door of the locking/unlocking device is sent in conjunction with a fire alarm, etc., and the stopper 9 is rotated slightly counterclockwise in the figure by the operation of a solenoid, etc. This stopper 9 is disengaged from the engagement step portion 4b of the locking plate 4. As a result, the latching plate 4 and the claw plate 3 rotate counterclockwise in the figure, the latched member 2 comes off the hook part 3c, the fire door is opened, and the passage is closed (unlocking operation). .

In addition, in the event that the electrical system for opening the fire door from the state fixed to the passage wall breaks down in an emergency, the hooked member 2 can be forcibly separated from the hook part 3c as follows to prevent the fire. The door can be opened. That is, as shown in FIG. 2, a force is applied to the hook portion 3c of the claw plate 3 in the direction in which the latched member 2 is released, and this force compresses the coil spring 7 against its elastic force. If this is sufficient, the pawl plate 3 will rotate relative to the catch plate 4. This rotation of the pawl plate 3 causes the tip of the stopper 9 to move along the cam portion 3d and disengage from the engagement step portion 4b. With this, the claw plate 3 and the latching plate 4 are attached to the latched member 2.
The fire door can be forcibly opened from the state where it is fixed to the passageway wall by rotating in the direction of release.

By the way, the force required for the above-mentioned forcible unlocking operation in the above-mentioned device is such that it cannot be unlocked needlessly by a child or the like during normal times, and that it can be unlocked as necessary in an emergency. In the case of the above device, it is necessary to set the screw 6 to coil spring 7
By adjusting the length of the coil spring 7, the elastic force generated by the coil spring 7 can be adjusted.

``Problems to be Solved by the Invention'' However, in the conventional device described above, the following problem occurred when adjusting the elastic force of the coil spring 7.

() In the above device, the elastic force generated by the coil spring is adjusted by rotating the screw 6 to adjust the length of the coil spring 7,
This allows the force required for the forced unlocking operation to be adjusted appropriately. However, as described above, since the distance from the rotation axis (fulcrum) 5 to the engagement plate parts 3e and 4d, which are the operating points at the time of forced release, is relatively long, the elastic force of the coil spring 7 increases or decreases relatively little. This results in a relatively large change in the force required for the forced unlocking operation. Therefore, in order to make the force required for the forced unlocking operation appropriate, the screw 6 must be rotated delicately, making adjustment very difficult.

() In the above device, as shown in FIG. 6, there is a method in which a screwdriver or the like is inserted through the opening 1a of the casing 1 to rotate the screw 6 with the fire door open from the device, and a method in which the screw 6 is rotated with the fire door opened from the device. 3
The above adjustments were made by rotating the locking plate 4 to the same position as in the locked state, inserting a screwdriver or the like through a hole drilled near the opening 1a, and rotating the screw 6. . However, in the above method, since the pawl plate 3 etc. are set in the locked position, the switch etc. of the unlocking mechanism interlocked with the pawl plate 3 via the stopper 9 may be set in the locked state. Therefore, when re-securing the latched member 2 after adjustment, it is complicated to operate a fire alarm, etc., set the latched member 2 to the unlocked state, and then lock the latched member 2. Occasionally, operations were required. Also,
In the above method, if the screw 6 is pushed with excessive force by mistake, the claw plate 3 etc. may rotate and the device may be set to the locked state in the same way as in the above case, and the device may be locked again. There was a problem that complicated operations were required.

This invention was made in view of the above circumstances,
Easily adjust the force required to forcefully unlock existing equipment.
It is also an object of the present invention to provide a locking/unlocking device that can reliably maintain the unlocked state of the device.

``Means for Solving the Problems'' The locking/unlocking device of this invention has a hook plate mounted on a pawl plate which is rotatably supported on a rotation shaft in a casing, and one end of which is attached to the rotation shaft. A cover portion is provided nearby that is rotatably supported on the claw plate and covers the head of an adjustment screw provided on the claw plate and the locking plate, and is configured to expose the head of the adjustment screw. A lock preventing member having a locking portion that rotates as the cover portion rotates and engages at least one of the claw plate and the locking plate is disposed near the claw plate and the locking portion. It is characterized by a rotatably supported structure.

"Function" According to the above configuration, the claw plate is rotatably fixed to the casing, and the hanging plate is movable relative to the casing, but is rotatably fixed to the claw plate. Therefore, the hanging plate has two fulcrums. Therefore, when the claw plate rotates, the latch plate is moved in the same direction and rotated relative to the claw plate, so the level of the latch plate can be adjusted without significantly rotating the claw plate. It becomes possible to release the engagement between the part and the locking member. Furthermore, for the same reason,
This prevents the force required for the forced unlocking operation from changing greatly due to an increase or decrease in the elastic force of the coil spring that biases the engagement plate portion of the pawl plate against the engagement plate portion of the latching plate. This makes it much easier to adjust the force required for forced unlocking to an appropriate level.

In addition, in the above configuration, when the claw plate is in the unlocked state, the adjusting screw is covered with the cover part of the lock prevention member, but by flipping up this cover part with a screwdriver, the screwdriver can be inserted into the head of the adjusting screw. When the locking member is brought into contact with the driver, the tip of the cover comes into contact with the driver, and the engaging portion of the lock preventing member engages with the claw plate or the hook plate. As a result, when rotating the screw with a screwdriver, even if the screw is strongly pushed inward of the casing, the pawl plate and the locking plate do not rotate and the locking state does not occur.

This invention will be explained in more detail below using examples.

Embodiment FIGS. 1 to 3 show an embodiment of this invention, and parts common to those in FIG. 4 are given the same reference numerals to simplify the explanation.

In the figure, reference numeral 10 indicates a roughly J-shaped claw plate that is rotatably supported by a rotation shaft 11 and biased counterclockwise in the figure by a torsion coil spring 12, as in the conventional case. It is something. This nail plate 10
As shown in FIG. 2, nail plate laminates 14 having substantially the same shape are laminated and integrated on the lower surface of the nail plate main body 13, thereby increasing the thickness. The nail plate main body 13 has a long arm portion 1
3a, a substantially J-shaped plate member having a short arm portion 13b and a hook portion 13c, and a cam portion 15 that comes into contact with a locking member to be described later is formed at the end (other end) of the long arm portion 13a. , the long arm portion 13a, the short arm portion 13b and the hook portion 13c are provided on the side of the long arm portion 13a.
A substantially rectangular engagement plate portion 16 is integrally provided that stands upright above the plate surface constituted by. A through hole 17 into which the rotation shaft 11 is inserted is located near the intermediate corner between the long arm portion 13a and the short arm portion 13b.
A through hole 17b is provided near the through hole 17a in the center of the long arm portion 13a, into which a rotation shaft 18a for rotatably supporting a locking plate 18, which will be described later, is inserted. is drilled, and the short arm part 13b and the hook part 1
This nail plate body 13 is located near the middle corner of 3c.
A through hole 17c is provided for integrally fixing the nail plate laminate 14 and the nail plate laminate 14 with caulking bolts. The claw plate laminates 14 are formed to have the same shape and dimensions as the claw plate main body 13 from which the engagement plate portion 16 is removed. A rectangular cutout 16a is provided at the center of the base end of the engagement plate portion 16, a through hole 16b is provided at the upper center portion, and the engagement plate portion 16a is provided at the right side of the upper end of the engagement plate portion 16. 1
A plate-shaped locking piece 16c perpendicular to 6 is integrally provided.

The latching plate 18 includes a latching plate main body 20 on which an engaging plate portion 19 facing the engaging plate portion 16 of the claw plate 13 is erected on the side thereof, and a thick wall on the upper surface of the latching plate main body 20. It is composed of a hanging laminate plate 21 that is laminated for the purpose of increasing A through hole 17 of the hook plate body 13 is provided at one end (left side) of the hook plate body 20.
A through hole 20a corresponding to b is drilled, and the same body 2
The other end of the main body 20 is provided with an engaging stepped portion 20b that engages with a locking member to be described later, and the main body 20 and the above-mentioned locking laminate plate 21 are integrated into a plate surface near the other end of the main body 20. A through hole 20c is provided for fixing to. Further, the engagement plate portion 19 has a vertically long length L.
It has a long plate shape that is bent into a letter shape, and its width is set to be slightly smaller than the width of the hollow opening 16a provided in the engagement plate portion 16 of the claw plate main body 13. A screw hole 19a corresponding to the through hole 16b of the engagement plate portion 16 and having a smaller diameter than the through hole 16b is bored in the upper part. The latching laminate 21 has the same shape and dimensions as the latching plate main body 20 from which the engagement plate portion 19 is removed.

The locking plate 18 having the above-mentioned shape has its engagement plate portion 19 located outside the engagement plate portion 16 of the claw plate 10, and
It is rotatably attached to the top of the 0. Therefore,
The range in which the locking plate 18 rotates relative to the claw plate 10 is as follows:
Length range of the bent portion at the lower end of the hanging plate 19 (Fig. 2 d)
dimensions).

The screw hole 1 of the engagement plate portion 19 of the latching plate 18 rotatably mounted on the claw plate 10 as described above.
An adjustment screw 22 passing through the through hole 16b of the engagement plate portion 16 is screwed onto the screw 9a.
A coil spring (elastic member) 23 is interposed between the head portion 22a and the engagement plate portion 16, and has a predetermined elastic force adjusted by the screw 22, so that the engagement plate portion 16 is constantly urged toward the engagement plate portion 19.

Further, near the opening 1a of the casing 1 near the claw plate 10, a stopper (locking member) 24 is rotatably supported on a rotation shaft 25, which is fixed or released by an unlocking mechanism (not shown). At the same time, it is biased counterclockwise in FIG. 1 by a torsion coil spring 26 mounted on the rotation shaft 25. This stopper 24 has an end edge portion of a short arm portion 24a in contact with the cam portion 15 of the claw plate 10, and a locking plate 1
The long arm portion 24b extends toward the vicinity of the rotation shaft 11, as shown in FIG.

Further, a lock prevention member 2 is attached to the rotation shaft 25.
7 is rotatably supported. This lock prevention member 27 is attached so that its plate portion 27a is substantially perpendicular to the rotation axis 25, and the opening 1 is attached to the rotation axis 25 of this plate portion 27a.
The portion located on the a side is bent at a substantially right angle and extends to cover at least a portion of the head 22a of the screw 22 to form a cover portion 27b. On the other hand, the side of the plate portion 27a opposite to the cover portion 27b is slightly extended to form a locking portion 27c.
This locking portion 27c protrudes radially inward from the rotation locus drawn by the end of the claw plate 10 when the claw plate 10 and the latch plate 18 are in the unlocked state shown in FIG. Therefore, the cover part 2
When the tip of 7b contacts the screw 22 and is pushed up to the vicinity of the opening 1a, the locking portion 27c can engage with the engagement plate portion 16 at the end of the claw plate 10.

Furthermore, in the unlocked state shown in FIG. 3, the lock prevention member 27 is allowed to rotate slightly clockwise in the figure against the elastic force of the torsion coil spring 26, as shown in FIG. An adjustment tool such as a screwdriver can be brought into contact with the screw 22.

Based on the above configuration, the lock prevention member 27 is
As shown in FIG. 3, when adjusting the elastic force of the coil spring 23 in the unlocked state, the cover portion 2
When 7b is separated from the screw 22 with a screwdriver or the like, the locking portion 27c projects toward the rotation shaft 11 from the rotation locus of the tip of the locking plate 18, and therefore the locking plate 18 and the claw plate 10 are in the locked state. The shifting rotation is prevented by the locking portion 27c.

However, in the above configuration, if the solenoid cannot be operated due to a failure of the electrical system, etc., when the latched member 2 is strongly pulled in the release direction, the claw plate 10 is moved in the direction of arrow A as shown in FIG. The cam portion 15 at the end thereof slides while coming into contact with the short arm portion 24a of the stopper 24. Along with this, the stopper 24 rotates slightly in the direction of arrow B in the figure, and the engagement with the locking step 20b of the locking plate 18 is released. He was released from prison and forcibly unlocked. Note that at this time, the rotation shaft 18a on the claw plate 10
moves along with the pawl plate 10 in the direction of arrow C in the figure, but since the engaging stepped portion 20b at the end thereof is locked by the stopper 24, the whole is tilted somewhat. Naturally, as the posture inclines, the engagement stepped portion 20b also inclines with respect to the stopper 24, and as a result, it acts in the same way as the cam portion 15 of the pawl plate 10, so that the forcible unlocking operation described above is performed more smoothly. It will be. Furthermore, since the locking plate 18 is tilted as described above when unlocking, a small increase or decrease in the elastic force of the coil spring 23 will not cause a large change in the force required for the forced unlocking operation, and as a result,
This makes it much easier to adjust the force required for forced unlocking to an appropriate level.

Furthermore, when adjusting the magnitude of the force required for forced unlocking, the device is in the unlocked state.
In this state, as shown in FIG. 3, a portion of the head 22a of the screw 22 is covered by the cover portion 27b of the lock prevention member 27. Therefore, when fitting the screwdriver to the screw head 22a, the cover portion 27b is flipped up at the tip of the driver as shown in the figure. When the screwdriver is in contact with the screw head 22a in this manner, the tip of the cover portion 27b is in contact with the driver and the locking portion 27c is in contact with the locking plate 1.
8. Therefore, according to the above device, even if the screw head 22a is strongly pushed inward of the casing 1 when the screw 22 is rotated with a screwdriver, the lock prevention member 27 keeps the claw plate 10 and the latch plate 18 in the locked state. migration is reliably prevented. Therefore, according to the above-mentioned device, when adjusting the force required for forced release by the screw 22, it is possible to prevent an accident of accidentally shifting the device to the unlocked state, and to apply sufficient pressing force to the screw 22. In addition, the driver can be reliably fitted, allowing for stable and easy-to-work adjustment operations.

``Effects'' As explained above, according to the locking/unlocking device according to this invention, the claw plate is rotatably fixed to the casing, the latch plate is movable relative to the casing, but the claw plate is rotatably fixed to the casing. It is rotatably fixed to the holder, so the latching plate has two fulcrums. Therefore, when the claw plate rotates, the catch plate also moves in the same direction and rotates relative to the claw plate, so the stage of the catch plate can be adjusted without significantly rotating the claw plate. It becomes possible to release the engagement between the part and the locking member. Furthermore, for the same reason, the force required for forced unlocking changes greatly depending on the increase or decrease in the elastic force of the coil spring that biases the engagement plate part of the claw plate against the engagement plate part of the latching plate. This makes it much easier to adjust the force required for forced unlocking to an appropriate level. Also, when the claw plate is in the unlocked state, the adjusting screw is covered with a cover part of the lock prevention member, but if you flip up this cover part with a screwdriver and bring the screwdriver into contact with the head of the adjusting screw. , the tip of the cover comes into contact with the driver, and the locking portion of the lock prevention member engages with the claw plate or the locking plate. As a result, when rotating the screw with a screwdriver, even if the screw is strongly pushed inward of the casing, the pawl plate and the locking plate do not rotate and the locking state does not occur.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention. Figure 1 is a front view, Figure 2 is an exploded perspective view of the main parts, and Figure 3 is adjustment of the force required for forced unlocking. The front view inside, Figures 4 to 6 are conventional locks and
Fig. 4 is a front view, and Figs. 5 and 6 are front views of the main parts, showing the unlocking device. DESCRIPTION OF SYMBOLS 1... Casing, 1a... Opening, 2... Latching member, 10... Claw plate, 11... Rotation shaft, 13
c...Hook part, 15...Cam part, 16, 19...Engagement plate part, 16b...Through hole, 18...Latching plate, 2
0b...Engagement plate part, 22...Adjustment screw, 22a...
... Head of adjustment screw, 23 ... Coil spring (elastic member), 24 ... Stopper (locking member), 2
7...Lock prevention member, 27b...Cover part, 2
7c...Locking part.

Claims (1)

[Claims for Utility Model Registration] A casing having an opening on one side, rotatably supported on a rotating shaft in the casing, and having a hook portion facing the opening at one end thereof, and The other end has a cam part that comes into contact with a locking member that is rotatably provided in the casing, and an engagement plate part is provided upright on the side of the other end, and the cam part is inserted through the opening. a pawl plate for removably locking the locking member with the hook portion; one end of the pawl plate is rotatably supported on the pawl plate in the vicinity of the rotation axis; a locking plate having a stepped portion that engages with a locking member and having an engagement plate portion facing the engagement plate portion of the nail plate erected on the side of the other end; and an engagement plate of the nail plate. an adjustment screw that loosely passes through a through hole provided in the part and is screwed together so as to pass through an engagement plate part of the locking plate; a head of the adjustment screw and an engagement plate part of the claw plate; an elastic member interposed between the nail plate and the retaining plate that biases the engaging plate portion of the hook plate against the engaging plate portion of the locking plate with a predetermined force; The cover part is rotatably supported by a shaft, and has a cover part that covers at least a part of the head of the adjustment screw when the hook part is released, and the cover part is configured to expose the head of the adjustment screw. a lock prevention member having a locking portion that rotates with the rotation and engages at least one of the claw plate and the locking plate, and prevents the claw plate from rotating to the locked state; A locking/unlocking device is provided.