JP6318222B1 - Latch lock device - Google Patents

Abstract

Provided is a latch locking device with a cap which is unlikely to cause a half-hanging state of a latch bolt and is free from accidental unlocking due to vibration or the like. When a latch bolt is engaged with a receiving metal fitting in a closed state and the tip of a control plate 8 is in a retracted position in contact with the receiving metal fitting, the lock pin 5 is pushed in by closing the cover plate. Then, it falls into the recess 15 of the latch bolt 7 to restrain the latch bolt 7 in the locking position. Further, since the lid plate is locked to the fixed frame plate in the closed position, the lock pin 5 is constrained to the lock position, and the latch bolt 7 is retracted unintentionally due to impact or the like so that the door does not open. [Selection] Figure 7

Description

  The present invention relates to a locking device attached to a door in order to lock a door hinged to a fixed frame body of a housing to the fixed frame body in a closed state.

  Conventionally, for example, a lock used for a door of a box that contains a control panel of a traffic signal, the cap that covers the keyhole is locked in order to prevent malfunction of the lock mechanism due to intrusion of dust or rainwater. It is equipped on the front part of the main body (see, for example, Patent Document 1). The cap includes a fixed wing portion and a movable wing portion that are hinged by a pivot parallel to the front surface of the lock body. The fixed wing is fixed to the lock body. When the movable wing is closed to the fixed wing, it covers the front face of the lock body. The movable wing portion includes a hook portion, and the fixed wing portion includes a catch portion that engages with and disengages from the hook portion. When the movable wing portion is closed to the fixed wing portion and covers the front side of the lock body, the hook portion engages with the catch portion. Both engagements are maintained until unlocked using the key.

JP 2004-250877 A

The conventional locking device is fixed to the door and engages with a metal receiver fixed to the fixed frame of the housing. That is, in the conventional locking device described above, the latch bolt that is slidably biased by the spring so as to protrude from the side surface of the latch unit constituting the locking device engages with the round shaft bar of the receiving member on the fixed frame side. In general, the door is locked to the frame body. The latch bolt includes a sliding slope portion that is in sliding contact with the round shaft rod, and a flat surface portion that is engaged with and contacts the round shaft rod.
In general, a round shaft bar is rotatable about an axis. Therefore, when the flat surface part of the latch bolt is half-hanging on the round shaft bar for some reason, that is, when it is only caught at the tip of the original flat surface part, or when the latch bolt is pushed halfway into the round shaft bar The round shaft rod is likely to rotate due to external vibration or the repulsive force of the packing between the fixed frame and the door. Thereby, there is a risk that the latch bolt and the round bar shaft are disengaged and the door is unintentionally opened. In addition, when a large impact is applied, there is a risk that the latch bolt retracts against the spring force, thereby opening the door.
Accordingly, an object of the present invention is to provide a latch locking device with a cap that is unlikely to cause a half-hanging state of a latch bolt and that is free from accidental unlocking due to vibration or the like.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, a latch locking device 1 of the present invention is a locking device that is attached to a door in order to lock the door hinged to the fixed frame body of the housing to the fixed frame body, a latch unit 2 which engages withdrawal against the receiving metal 41 fixed to the frame, the cylinder lock to release the engagement between the receiving metal 41 and the latch unit 2 by operating the key is secured to the latches unit 2 3, a protective cap 4 that covers and exposes the key hole 25 of the cylinder lock 3, and a lock pin 5 that restrains engagement of the receiving metal fitting 41 and the latch unit 2 in a state where the cylinder lock 3 is covered.
The latch unit 2 includes a latch case 6 that is fixed to the back side of the door, a latch bolt 7 that is provided in the latch case 6 so as to be able to advance and retract in parallel with the front surface of the door, and is engaged with and disengaged from the receiving metal fitting 41. A plate 8 is provided.
The cylinder lock 3 has an outer cylinder 24 fixed to the latch case 6 and a key hole 25 opened on the front surface so that the key can be rotated with respect to the outer cylinder 24 by a key, and the latch bolt 7 is driven at the rear end. And an inner cylinder 26 connected to the latch bolt 7, and the front surface of the inner cylinder 26 is provided so as to be exposed to the front surface side of the door.
The protective cap 4 is a cap that restrains both the fixed frame plate 29 and the lid plate 30 that are hinged to be openable and closable on the base end side, and the fixed frame plate 29 and the lid plate 30 in a closed state. Cap locking mechanisms 32a and 32b for releasing both of them by the unlocking operation of the key are provided, the fixed frame plate 29 is fixed to the front side of the outer cylinder 24 of the cylinder lock 3 on the front side of the door, and the lid plate 30 is It arrange | positions so that the front surface of the cylinder lock 3 may be coat | covered in a closed state.
The lock pin 5 vertically passes through the outer cylinder 24 and the latch case 6 of the cylinder lock 3 in the front-rear direction, and when the lid plate 30 is in an open state, the unlocking position in which the front end projects to the front side of the door, The front end portion is pushed into the cylinder lock 3 by the lid plate 30 in the state, and the rear end portion can be moved back and forth between the lock position protruding into the latch case 6 and biased to the unlock position. .
The latch bolt 7 can move forward and backward in parallel with the front surface of the door between a locking position that protrudes from the latch case 6 and engages with the receiving bracket 41 and an unlocking position that disengages the receiving bracket 41. It is biased to the stop position. The latch bolt 7 permits the sliding slope 12 with which the metal fitting 41 is slidably contacted during the door closing operation, and allows the lock pin 5 to retreat to the lock position at the lock position, thereby constraining the latch bolt 7 to the lock position. A recess 15 and a contact surface 14 that faces the rear end of the lock pin 5 at an intermediate position between the lock position and the unlock position, thereby preventing the lock pin 5 from moving back to the lock position, and closing the door. In the course of operation, the sliding inclined surface 13 is pushed by the receiving metal fitting 41 and retracted to the unlocking position, and then protrudes to the locking position and engages with the receiving metal fitting 41 in the closed state.
The control plate 8 can move forward and backward between a protruding position protruding from the latch case 6 along with the latch bolt 7 and a retracted position retracted toward the latch case 6, and is urged to the protruding position. Is placed in the retracted position in contact with the receiving metal fitting 41. The control plate 8 includes a sliding slope 19 that comes into sliding contact with the metal fitting 41 during the closing operation, and a contact surface 21 that prevents the lock pin 5 from retreating to the locking position by facing the rear end of the locking pin 5 at the protruding position. And a recess 22 that allows the lock pin to retract to the lock position in the retracted position, and is provided so that the sliding slope 19 is pushed by the receiving metal fitting 41 and retracts to the retracted position during the closing operation.

  In the latch lock device 1 of the present invention, the latch bolt 7 is engaged with the receiving metal fitting 41 in the completely closed state, and the front end of the control plate 8 is in contact with the receiving metal fitting 41 and is in the retracted position. When the lid plate 30 is closed, the lock pin 5 is pushed into the cylinder lock 3 and the rear end portion falls into the latch bolt 7 and the recesses 15 and 22 of the control plate 8 to restrain the latch bolt 7 in the locked position. Since the lid plate 30 is locked to the fixed frame plate 29 in the closed position, the lock pin 5 is restrained to the lock position. Therefore, the latch bolt 7 does not retreat unintentionally due to impact or the like, and the door does not open. The door is double-locked by the cylinder lock 3 and the protective cap 4. On the other hand, when the control plate 8 is pushed into the retracted position by the receiving bracket 41, that is, when the latch bolt 7 is not engaged with the receiving bracket 41, the control plate 8 is in the protruding position and the lock pin 5 is in contact. Since it faces the contact surface 21 and is restrained to the unlock position and protrudes forward from the cylinder lock 3, the lid plate 30 cannot be closed. Further, in a half-hanging state in which the latch bolt 7 is incompletely engaged with the receiving metal fitting 41, the latch bolt 7 does not completely protrude to the locking position, so that the lock pin 5 contacts the contact surface 14 and cannot be pushed in. . For this reason, reliable locking of the door can be confirmed by the state of the cover plate 30.

It is a front view of the latch locking device which concerns on this invention, (A) shows the locked state which closed the protective cap, (B) shows the unlocked state which opened the protective cap. It is a side view of the latch lock apparatus of FIG. 1, (A) shows the locked state which closed the protective cap, (B) shows the unlocked state which opened the protective cap. It is a front view which shows the inside of the latch unit in the latch lock apparatus of FIG. 1, (A) shows the locked state which closed the protective cap, (B) shows the unlocked state which opened the protective cap. It is sectional drawing of the lock pin periphery of the latch lock apparatus of FIG. 1, (A) is a fragmentary sectional view in alignment with IVa-IVa in FIG. 1 (A), (B) is IVb-IVb in FIG. 1 (B). FIG. It is sectional drawing of the lock pin periphery of the latch lock apparatus of FIG. 1, (A) is partial sectional drawing in alignment with Va-Va in FIG. 1 (A), (B) is Vb-Vb in FIG. 1 (B). FIG. It is a front view which shows the inside of the latch unit in the latch lock apparatus of FIG. 1, (A) is in the middle of door closing operation | movement, (B) shows the time of unlocking. It is a disassembled perspective view which shows a part of structure of the latch lock apparatus of FIG.

Embodiments of the present invention will be described with reference to the drawings.
1 and 2, a latch locking device 1 is a locking device that is attached to a door to lock a door hinged to a fixed frame body of a housing (not shown) to the fixed frame body. A cylinder lock 3, a protective cap 4, and a lock pin 5.

  The latch unit 2 is fixed to the back surface side of the door, and is automatically locked by being locked with the receiving metal fitting 41 on the side of the fixed frame body when the door is closed, and the cylinder lock 3 is unlocked with a key (not shown). It separates from 41 and allows the door to be opened.

  As shown in FIGS. 2 and 3, the latch unit 2 includes a latch case 6, a latch bolt 7 and a control plate 8 provided in the latch case 6.

  As shown in FIG. 4, the latch case 6 includes a rectangular box-shaped case body 9 that opens forward, and a front plate 10 that is fixed to the case body 9 so as to close the opening. The front plate 10 is fixed to the door in parallel with the front surface of the door.

  The latch bolt 7 is provided in the latch case 6, protrudes from the opening of the latch case 6 and engages with the receiving metal fitting 41 (FIG. 1A to FIG. 5A), and retracts into the latch case 6. Then, it can move forward and backward in parallel with the front surface of the door between the unlocked position (FIG. 6B) where the engagement with the receiving metal fitting 41 is disengaged, and is biased to the locked position by the spring 11.

  As shown in FIGS. 5 and 6, the latch bolt 7 includes a sliding slope 12 on which the receiving bracket 41 slides, an engagement plane 13 on which the receiving bracket 41 engages, and a contact surface on which the lock pin 5 contacts. 14 (FIG. 6), a recess 15 (FIG. 6) into which the lock pin 5 falls, and a cam groove 16 (FIG. 6) with which the cylinder lock 3 is engaged.

  In the course of the closing operation, the receiving bracket 41 is in sliding contact with the sliding slope 12 from the proximal end side to the distal end side, thereby retracting the latch bolt 7 to the unlocked position (FIG. 6A). When 41 passes the tip of the sliding slope 12, the latch 11 protrudes to the locking position by the spring 11 (FIG. 1 to FIG. 5A), and the catch 41 is automatically engaged with the engagement plane 13. Match.

  As shown in FIGS. 6 and 7, a ridge 17 is provided on one edge along the advancing / retreating direction of the latch bolt 7 so as to extend to the base end side continuously to the engagement plane 13. A contact surface 14 that is continuous with the engagement plane 13 and a recess 15 that falls rearward perpendicularly thereto are provided.

  As shown in FIG. 6, the control plate 8 is supported in the case 6 along the latch bolt 7 along one side surface along the forward / backward direction of the latch bolt 7 and capable of moving forward / backward in the same direction. The control plate 8 is pushed into the latch case 16 by being pushed by the receiving metal 41 and the projecting position (FIG. 1 to FIG. 5 (B)) that projects from the latch case 6 along with the latch bolt 7 in the locking position. It can be moved back and forth between the retracted position (FIG. 1 to FIG. 5A) in parallel with the front surface of the door, and is urged by the spring 18 to the protruding position. The control plate 8 includes a sliding slope 19, a tip projection 20, a contact surface 21, and a recess 22. The control plate 8 has substantially the same shape as the side surface of the adjacent latch bolt 7, and the sliding slope 19 is flush with the sliding slope 12 of the latch bolt 7 in the locking position at the protruding position (FIG. 5B )), The contact surface 21 is flush with the contact surface 14. As shown in FIGS. 4 and 5, the tip protrusion 20 stands at the front end of the control plate 8 higher than the engagement plane 13 of the latch bolt 7, and continues vertically to the sliding slope 19. The front end surface 23 stands up.

  The control plate 8 is pushed into the retracted position (FIG. 6 (A)) together with the latch bolt 7 when the receiving metal fitting 41 is in sliding contact from the proximal end side to the distal end side of the sliding slope 19 during the door closing operation. However, even after the receiving metal fitting 41 has passed through the sliding slope 19, the front end surface 23 abuts on the receiving metal fitting 41, so that it is held in the retracted position. Therefore, only the latch bolt 7 protrudes to the locking position and the receiving metal fitting 41. (A in FIG. 1 to FIG. 5).

  As shown in FIG. 5, the cylinder lock 3 includes an outer cylinder 24 that is fixed to the front plate 10 of the latch case 6 at the rear end, and an inner cylinder that can be rotated in the unlocking direction with respect to the outer cylinder 24 by operation with a key (not shown). And a tube 26. As shown in FIG. 1 (B), the cylinder lock 3 is fixed to the door such that the key hole 25 on the front surface of the inner cylinder 26 is exposed on the front surface side of the door. The inner cylinder 26 freely penetrates the front plate 10 at the rear end, and engages with the cam groove 16 of the latch bolt 7 in the latch case 6 to drive the cam 27 (FIGS. 3, 5, and 6). It has.

  As shown in FIGS. 1 and 2, the protective cap 4 includes a fixed frame plate 29 and a lid plate 30 that are hingedly connected to each other on the base end side by a pivot 28 parallel to the front surface of the door. . The fixed frame plate 29 is fixed to the front surface side of the outer cylinder 24 by exposing the front surface of the inner cylinder 26 of the cylinder lock 3 forward from the opening 31. The fixed frame plate 29 and the lid plate 30 are provided with cap locking mechanisms 32a and 32b on the distal end side that are automatically locked in a closed state where they are closed together. The locked cap locking mechanisms 32a and 32b are unlocked by an unlocking operation using a cap key (not shown). The fixed frame plate 29 is fixed to the front surface of the outer cylinder 24 of the cylinder lock 3 on the front surface side of the door. As shown in FIGS. 1 and 2A, the lid plate 30 is disposed so as to cover the key hole 25 of the cylinder lock 3 in the closed state.

  As shown in FIG. 4, the lock pin 5 vertically penetrates the outer cylinder 24 of the cylinder lock 3 and the front plate 10 of the latch case 6 in the front-rear direction, so that the lock position (FIG. 4A) and the unlock position ( 4 (B)) is provided so as to freely advance and retract in the front-rear direction. When the cover plate 30 is in the open state, the lock pin 5 is biased by the spring 33, and the front end is in the unlocked position protruding to the front side of the door, and the cover plate 30 is in the closed state. The front end portion is in a locked position where it is pushed into the cylinder lock 3 by being pushed by the lid plate 30. As shown in FIG. 3, the rear end of the lock pin 5 faces the boundary between the latch bolt 7 and the control plate 8, and the backward movement of the lock pin 5 is the contact surface between the latch bolt 7 and the control plate 8. Limited by positions 14,21.

  The positional relationship between the recess 15 of the latch bolt 7 and the recess 22 of the control plate 8 is set as follows. That is, as shown in FIG. 1 to FIG. 5A, in a state where the latch bolt 7 protrudes to the locking position and the control plate 8 is held in the retracted position, the recess 15 of the latch bolt 7 and the control plate 8 , And the recess 22 of the lock pin 5 is allowed to retreat. As shown in FIG. 3B, when the control plate 8 is in the protruding position, the recess 22 and the lock pin 5 do not match, and therefore the lock pin 5 is prevented from moving backward.

  In the latch lock device 1 configured as described above, when the door is open, both the latch bolt 7 and the control plate 8 are in a position protruding from the case 6, the lock pin 5 protrudes forward, and the lid plate 30 is opened. ((B) in FIGS. 1 to 5). In this state, the rear end of the lock pin 5 faces the abutment surface 21 of the control plate 8 and cannot be retracted, so the lid plate 30 cannot be closed.

  From this point, when the door is closed, the sliding slopes 12 and 19 are pushed by the receiving metal fitting 41 on the housing side, and the latch bolt 7 and the control plate 8 are pushed together into the latch case 69 (FIG. 6 ( A)). When the tip of the latch bolt 7 passes through the receiving metal fitting 41, the latch bolt 7 automatically protrudes to the locking position by the urging force, and the engaging flat surface 13 is engaged with the receiving metal fitting 41 and locked (see FIGS. 1 to 5). (A)). In this state, the front end surface 23 of the control plate 8 abuts against the receiving metal fitting 41 and is held in the retracted position, and the recess 22 matches the rear end of the lock pin 5. 30 can be closed. When the lid plate 30 is closed, the cap locking mechanisms 32a and 32b are automatically locked with the fixed frame plate 29.

  If for some reason the door is not fully closed and the latch bolt 7 is half-hanging with respect to the receiving metal 41, the latch bolt 7 is in the process of retreating or projecting, so the rear end of the lock pin 5 is the latch bolt. 7 faces the abutting surface 14 and the lid plate 30 cannot be closed. Therefore, whether or not the door is completely closed and locked depending on the state of the lid plate 30 can be easily confirmed by visual observation.

  Further, when the door is closed and the lid plate 30 is also closed ((A) in FIGS. 1 to 5), the lock pin 5 falls into the latch bolt 7 and the recesses 15 and 22 of the control plate 8, respectively. Since the latch bolt 7 and the control plate 8 are prevented from retreating, the locking is not released even if a large vibration or impact is applied.

  In order to open the door, the key is inserted into the cylinder lock 3 and the inner cylinder 26 is rotated in the unlocking direction to the right in FIG. 1. As shown in FIG. Is pulled into the latch case 6 and disengaged from the metal fitting 41, and the door can be pulled with the key as it is. After the door is opened, the cylinder lock 3 returns to the locked position together with the latch bolt 7 and returns to the state shown in FIG.

DESCRIPTION OF SYMBOLS 1 Latch lock device 2 Latch unit 3 Cylinder lock 4 Protective cap 5 Lock pin 6 Latch case 7 Latch bolt 8 Control board 9 Case main body 10 Front plate 11 Spring 12 Sliding slope 13 Engagement plane 14 Contact surface 15 Recess 16 Cam groove 17 ridge spring 18 spring 19 sliding slope 20 tip projection 21 abutment surface 22 recess 23 tip end surface 24 outer cylinder 25 key hole 26 inner cylinder 27 cam 28 pivot 29 fixed frame plate 30 lid plate 31 openings 32a, b cap locking mechanism 33 Spring 41 Bracket

Claims (1)

A locking device attached to the door to lock the door hinged to the fixed frame of the housing to the fixed frame,
A latch unit for engaging disengaged against receiving metal fixed to the stationary frame member, a cylinder lock to release the engagement of the receiving and fitting said latch unit by the operation of which is fixed to the latches unit key A protective cap that covers and exposes the keyhole of the cylinder lock, and a lock pin that restrains the engagement between the metal fitting and the latch unit in the covered state of the cylinder lock,
The latch unit includes a latch case fixed to the back side of the door, a latch bolt and a control plate provided in the latch case so as to be movable forward and backward in parallel with the front surface of the door, Comprising
The cylinder lock is rotated by inserting a key into an outer cylinder fixed to the latch case and a key hole opened on the front surface, and is connected to the latch bolt so as to drive the latch bolt at a rear end portion. An inner cylinder, the front surface of the inner cylinder is exposed on the front side of the door,
The protective cap includes a fixed frame plate and a lid plate that are hinged to be openable and closable on the base end side, and the cap frame is unlocked in a closed state in which the fixed frame plate and the cover plate are closed. A cap lock mechanism that releases both of them by operation, the fixed frame plate is fixed to the front surface side of the outer cylinder of the cylinder lock on the front surface side of the door, and the front surface of the cylinder lock is closed when the lid plate is closed. Arranged to cover
The lock pin penetrates the outer cylinder of the cylinder lock and the latch case in the front-rear direction perpendicular to the front surface of the door, and the front end portion protrudes to the front side of the door when the cover plate is open. The unlocked position is freely movable back and forth between the unlocked position and the locked position where the front end is pushed into the outer cylinder and the rear end protrudes into the latch case by the lid plate in the closed state. Energized by
The latch bolt is movable forward and backward between a locking position that protrudes from the latch case and engages the receiving bracket and an unlocking position that disengages the receiving bracket, and is biased to the locking position. A sliding slope on which the metal fitting comes into sliding contact during the closing operation, a recess for restraining the latch bolt to the locking position by allowing the locking pin to move back to the locking position at the locking position, and a locking position. A contact surface that prevents the lock pin from moving backward to the lock position at an intermediate position with respect to the lock position, and the sliding slope is pushed back by the metal fitting during the door closing operation and then retracted to the unlock position. , Provided to engage the receiving bracket by protruding to the locking position in the closed state,
The control plate can be moved back and forth between a protruding position protruding from the latch case along with the latch bolt and a retracted position retracted toward the latch case, and is urged to the protruding position, and the front end surface is closed in the closed state. A sliding inclined surface that is in contact with the receiving metal fitting and is disposed at the retracted position and that slides on the receiving metal fitting during the door closing operation, and a rearward end of the lock pin at the protruding position, thereby retreating to the locking position. A contact surface for blocking and a recess allowing the lock pin to move back to the locked position at the retracted position, so that the sliding inclined surface is pushed by the receiving metal during the door closing operation and retracts to the retracted position. A latch lock device, characterized in that it is provided.

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