JPH09151641A - Door locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply perform unlatching operation from the outside even in the abnormal state where a key can not be used. SOLUTION: A key insert hole is provided in a pedestal for rotatably supporting a locking shaft 6, a pedestal fixing vis is covered with a seal in a recessed part, a movable base plate 15 to which a latch bar 7 is fixed is moved and energized in the projecting direction by a spring 10, and the locking shaft 6 is passed through an oblong slot 23 of the movable base plate 15, an oblong slot 24 of the front plate part of a case 18, an oblong slot 25 of a door 1, and an oblong slot 26 of the rear face plate part of the case 18. When the keyway 6b of the locking shaft 6 can not be used, the pedestal is detached, the locking shaft 6 is moved laterally along the slot, and the latch bar 7 is forced to escape from a receiving part 22 of a fixed frame 2 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door locking device used for a door of a substation in a building.

[0002]

2. Description of the Related Art Since it is extremely dangerous for ordinary people to enter and exit electrical facilities such as a substation room without permission, a door is provided with a locking device to lock the door when not in use. In the event of an abnormal situation in which a strong key is filled, the key cannot be inserted into the keyhole. In such a case, it is impossible to open the door unless the hinge pin on one side of the door is removed or a part of the door on which the locking device is mounted is burned off.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a door having a structure which can be easily unlocked from the outside even in an abnormal situation where the key cannot be used, and which cannot be understood by anyone other than the person concerned. It is to provide a locking device for use.

[0004]

Means for Solving the Problems A door locking device of the present invention includes a case 18 fixed to the door 1, a movable base plate 15 slidably accommodated in the case 18 in the left-right direction, and a movable base plate. 15, the front end portion 6
a protruding from the horizontal slot 24 of the front plate portion of the case 18 and the horizontal slot 25 of the door 1 and the locking shaft 6 whose rear end portion 6d protrudes from the horizontal slot 26 of the rear plate portion of the case 18;
A latch rod 7 fitted into a guide hole 27 in a left side plate portion of the case 18, a base end portion fixed to the movable base plate 15, and a distal end portion engaged with and disengaged from the receiving portion 22 on the fixed frame 2 side; A spring 10 inserted between the plate 15 and the right side plate of the case 18 to urge the movable base plate 15 in the forward direction;
A cam plate 20 fixed to the lock shaft 6 and sliding the movable base plate 15 backward when the lock shaft 6 rotates; disposed on the front side of the door 1, covering a front end of the lock shaft 6, A pedestal 4 provided with a blind hole-shaped bearing hole 28 for rotatably supporting the front end 6a, and a key insertion hole 34 provided in the front wall of the bearing hole 28 to communicate with the key hole 6b of the locking shaft 6; The pedestal 4 is inserted from the mounting hole 30 in the bottom wall portion of the formed recess 29 to
And a seal 5 that is fitted and bonded to the recess 29 so as to cover the head of the screw 32.

In the event of an abnormal situation where the keyhole 6b is filled with foreign matter and the use of the external unlocking key 17 becomes impossible, the seal 5 is peeled off and removed from the recess 29 of the pedestal 4. As a result, the fixing screw 32 of the pedestal 4 is exposed.
Remove from As a result, the front end 6a of the locking shaft 6 is exposed to the front side of the door 1 as shown in FIG. 6, and the locking shaft 6 is pulled in the direction of arrow F in FIG. I just need.

[0006] By this pulling operation, the locking shaft 6 is turned into the horizontal slot 24 in the front plate portion of the main body case 18, the horizontal slot 25 in the door 1, and the horizontal slot 2 in the rear plate portion of the main body case 18.
6 to the right. At this time, the locking shaft 6
Presses the right inner end face of the horizontally elongated slot 23 of the movable base plate 15, the movable base plate 15 slides backward to the right, and the tip end of the latch bar 7 escapes from the receiving portion 22 on the fixed frame 2 side. As a result, the lock of the door 1 with respect to the fixed frame body 2 is released, and the door 1 can be opened from the outside. Since the structure of such an emergency unlocking mechanism is concealed inside the pedestal 4, there is no danger that the structure will be known to ordinary people.

[0007]

In the illustrated embodiment, the pedestal 4 is a pedestal with a cap, and a fixing screw 32 of the pedestal 4 passes through a mounting hole 29 of a concave portion 29 of the pedestal 4 through a through hole 31 of the door 1. It is screwed into a screw hole 36 in the front plate of the case 18. The case 18 is divided into two parts, and one constituent part 18a and the other constituent part 18b are fastened and fixed by screws 16. The fixing screw 13 of the case 18 passes through the through hole 33 of the door 1 and the screw hole 3 of the front plate portion of the case 18.
Screwed to 5. The circular cap 3 is pivotally attached to the front side of the pedestal 4 by an eccentric shaft 11 and is attracted to the pedestal 4 side by a spring 12. When the door 1 is unlocked from the outside, the cap 3 is pulled out in a direction perpendicular to the front surface of the door 1 against the force of the spring 12 and rotated in the direction of arrow E in FIG. Thus, the key insertion hole 34 of the pedestal 4 is exposed, so that the key can be inserted into the key hole 6b of the locking shaft 6.

In an abnormal situation where the use of the keyhole 6b becomes impossible, if the cap 3 is further rotated in the direction of arrow C from the position shown in FIG. 2, the seal 5 is exposed and the seal 5 can be peeled off. The latch bar 7 is fixed to the movable base plate 15 by screws 19. A spring support 14b is protruded from a right side plate portion of the movable base plate 15 bent and formed into a U-shape, and a spring support 14a is formed on an inner surface of the right side plate portion of the case 18.
Is protruding. The biasing spring 10 composed of a compression coil spring is supported by both spring receivers 14a and 14b. The movable base plate 15 is guided by the inner surfaces of the front plate portion and the rear plate portion of the case 18 so as to slide linearly.

The internal unlocking handle 8 is fixed to the rear end 6d of the locking shaft 6 by a screw 9. The key 17 for external unlocking has a locking piece 17b fitted in a leading end split groove of a shaft portion, and is pivotally connected with a transverse shaft pin 17a. Locking shaft 6
When the shaft of the key 17 is inserted into the keyhole 6b of the
The tip cam surface of the key hole 6b hits the bottom surface of the keyhole 6b.
The locking piece 17b rotates so as to be perpendicular to the shaft as shown in FIG. 5, and engages with the horizontal hole 6c crossing the keyhole 6b. By rotating the key 17 in the direction of arrow E in FIG.
Is transmitted to the lock shaft 6.

A cam plate 20 fitted and fixed to the lock shaft 6
Is the handle 8 or key 1 under normal use conditions.
7, when the lock shaft 6 is turned, the movable base plate 15
The movable base 15 is slid backward by pressing the passive pin 21 fixed to the movable base 15. By this backward sliding, the tip portion of the latch bar 7 escapes from the receiving portion 22 on the fixed frame 2 side, and the locking of the door 1 to the fixed frame 2 is released, and the door 1 can be opened.

[0011]

As described above, according to the present invention, the pedestal 4 having the key insertion hole 34 is detached from the door 1 and the locking shaft 6 is directly pulled, so that the key 17 is inserted into the key hole 6b.
Even if an abnormal situation occurs in which the door 1 cannot be inserted, the door 1 can be easily released from the outside and opened. Further, since this emergency unlocking mechanism is invisible to the general public, the intended use of the locking device for ensuring the safety of the target facility is not impaired.

[Brief description of the drawings]

FIG. 1 is a front view showing a locked state of a substation door to which a door locking device according to an embodiment of the present invention is attached.

FIG. 2 is a front view of the door locking device.

FIG. 3 is a bottom view of the door locking device.

FIG. 4 is a front view of the door locking device when the pedestal with the cap is removed and the locking shaft is moved to the unlocking position.

FIG. 5 is a cross-sectional view taken along line AA of FIG. 1, showing a key insertion state.

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a front view of a door where the door locking device is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door 2 Fixed frame 3 Cap 4 Pedestal 5 Seal 6 Locking shaft 7 Latch rod 8 Internal unlocking handle 9 Handle fixing screw 10 Spring for biasing a movable base plate 11 Eccentric shaft of cap 12 Spring for pulling cap 13 Fixing screw for pedestal 15 Movable base plate 16 Case assembling screw 17 External unlocking key 18 Case 19 Fixing screw for latch rod 20 Cam plate 21 Passive pin for cam plate

Claims (1)

[Claims] A case fixed to the door; a movable base plate accommodated in the case so as to be slidable in the left-right direction;
5; and is inserted into the horizontally long slot 23 of the movable base plate 15, and the front end portion 6 a is the horizontally long slot 2 of the front plate portion of the case 18.
4 and the locking shaft 6 protruding from the horizontal slot 25 of the door 1 and the rear end 6d protruding from the horizontal slot 26 of the rear plate of the case 18; The latch rod 7 has an end fixed to the movable base plate 15 and a distal end engaged and disengaged from the receiving portion 22 on the fixed frame 2 side.
A spring 10 inserted between the movable base plate 15 and the right side plate portion of the case 18 to slidably bias the movable base plate 15 in the forward direction; and fixed to the locking shaft 6 when the locking shaft 6 rotates. A cam plate 20 for sliding the movable base plate 15 backward; a blind hole-shaped bearing hole disposed on the front side of the door 1, covering the front end of the locking shaft 6, and rotatably supporting the front end 6 a of the locking shaft 6. 28
A pedestal 4 provided with a key insertion hole 34 communicating with the key hole 6b of the locking shaft 6 in the front wall of the bearing hole 28; and a mounting hole 30 in the bottom wall of the recess 29 formed in the front surface of the pedestal 4. A locking device for a door, comprising: a screw 32 inserted to fix the pedestal 4 to the door 1; and a seal 5 fitted and adhered to the recess 29 so as to cover the head of the screw 32.