JP5524169B2 - Locking device - Google Patents

Description

  In railcars, common locks called sneak locks have been installed on cab doors, switchboard doors, and others for many years, and locking / unlocking operations are performed using a common key. The present invention relates to a lock device comprising such a lock and a key.

An example of a sneak lock used in a railway vehicle or the like is shown in FIG. In FIG. 14, the lock 41 has a rotor 43 disposed behind the front plate 42 having a key hole 42a. A latch shaft 44 protrudes behind the rotor 43, and a latch 45 is fixed thereto. The rotor 43 includes an engaging portion 46 on the front end side, and further includes a guide rod 47 that protrudes forward from the front end 46 c of the engaging portion 46.
The shaft of the key 48 includes a cylindrical portion 49 that opens to the tip side so as to receive the guide rod 47 of the rotor 43, a wing portion 50 that protrudes radially on the outer periphery of the cylindrical portion 49, and a tip from the wing portion 50. It has an engaging protrusion 51 protruding in the direction, and has a cross-sectional shape that fits into the key hole 42a. The front end portion of the engaging protrusion 51 protrudes toward the front end side in the axial direction from the front end of the cylindrical portion 49.
The engaging portion 46 of the rotor 43 has a locking direction contact surface 46a and an unlocking direction contact surface 46b at positions 90 ° apart from each other around the axis.
When the shaft of the key 48 is rotated right or left around the shaft in a state where the shaft is inserted into the key hole 42a until the tip of the cylindrical portion 49 comes into contact with the front surface 46c of the engaging portion 46 (operation position). The engaging protrusion 51 is configured to be in contact with any one of the contact surfaces 46a and 46b of the engaging portion 46 so that the rotor 43 can be rotated.
In the figure, the latch 45 is in the unlocked position. When the key 48 is inserted and rotated 90 times in the clockwise direction, the engaging protrusion 51 contacts the contact surface 46a of the rotor 43 and rotates the rotor 43, bringing the latch 45 to the unlocked position. The The key 48 is returned 90 ° therefrom and removed from the key hole 42a.
In addition, a lock device described in Patent Document 1 is known as a stealth lock. The lock device includes a lock seat that is fixed to either the front or back surface of the hinged door and has a keyhole, a latch that is rotatably attached to the front surface of the lock seat in a plane parallel to the front and back surfaces of the hinged door, It is provided on the back side of the seat and is attached to the latch so as to rotate integrally with the latch. And a lock that engages. The latch regulates the opening of the hinged door by detachably engaging with a receiver provided on the door frame side. When the lock is rotated with the key while the key is engaged with the lock, the lock is engaged with the lock and the lock is locked and the lock is locked. It is possible to selectively take the latch release state in which the combination is released and the latch is allowed to rotate. The key hole includes a round hole portion located at the center and a pair of insertion hole portions extending in a radial direction from the round hole portion.

JP 2011-106169 A

In the conventional locking device described above, if a tool is inserted through the gap between the door and the door frame and the latch is rotated, the unauthorized person can unlock it illegally.
Therefore, the invention according to this application provides a lock device that can prevent unauthorized unlocking as described above and can be easily replaced with an existing lock device without requiring a structural change of the door and door frame. It is an object.

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-mentioned problems, the lock device of the invention according to this application is engaged with a lock 1 fixed to a door, a key 2 for locking and unlocking the lock 1, and a fixed frame body such as a door frame. And a latch 3 coupled to the lock 1 so as to rotate forward and backward between a locking position to be released and an unlocking position to be detached from the fixed frame. The lock 1 includes a case 4, a rotor 5 and a drive member 6 accommodated in the case 4, and a spring 31 that biases the drive member 6. The case 4 includes a front plate 8 having a key hole 8a and a cylindrical portion 7 extending rearward of the front plate 8. The rotor 5 is relatively rotatable around the axis between the locked position and the unlocked position, and is disposed behind the cylindrical portion 7 of the case 4 so as not to move in the axial direction. The drive member 6 is relatively rotatable about an axis between a locked position and an unlocked position, and is movable in the axial direction between a front restraint position and a rear release position. Placed in. The spring 31 is interposed between the drive member 6 and the rotor 5 and biases the drive member 6 to the front restraint position. The case 4 and the drive member 6 include axial clutch engagement portions 18a, 18b, and 26 that are engaged with each other when the drive member 6 is in the restrained position and are disengaged when the drive member 6 is in the release position. The drive member 6 and the rotor 5 include key coupling portions 13 and 19 that mesh with each other so as to be movable relative to each other in the axial direction. The rotor 5 further includes a latch shaft 9 that protrudes rearward and is coupled to the latch 3. The driving member 6 is further disposed in the front, and a pressure receiving surface 24 that receives a pressing force backward by the key 2. A passive engagement portion 17 that is disposed in the front and engages the key 2 in the rotational direction around the axis. It comprises. The key 2 is inserted into the key hole 8a and the drive member 6 is pushed into the release position, and is rotated integrally with the rotor 5 to perform the locking / unlocking operation. Even if a tool is put on the latch 3 in the locked state to rotate it in the unlocking direction, the driving member 6 that engages with the rotor 5 is in the restraining position, and the rotor 5 is restrained to the case 4. I can't.

  According to the invention according to this application, it is possible to prevent the unauthorized person from unlocking illegally by directly rotating the latch, and it is possible to easily remove the existing locking device without requiring a structural change of the door or the door frame. It is possible to provide a locking device that can be exchanged with.

It is a disassembled perspective view of the locking device which concerns on this invention. It is sectional drawing of the locking device of FIG. 1, (A) shows an unlocking state, (B) shows the locking / unlocking operation state by a key. It is a rear view of the locking device of FIG. It is IV-IV sectional drawing in FIG. 2, (A) shows an unlocked state, (B) shows a locked state. It is a rear view of the case in the locking device of FIG. It is sectional drawing of the case in the locking device of FIG. It is a front view of the rotor in the locking device of FIG. It is a side view of the rotor in the locking device of FIG. It is a top view of the rotor in the locking device of FIG. It is a front view of the drive member in the locking device of FIG. It is a side view of the drive member in the locking device of FIG. It is an opposite side view of the drive member in the locking device of FIG. It is a top view of the drive member in the locking device of FIG. It is a schematic exploded perspective view of the conventional locking device.

Embodiments of the present invention will be described with reference to the drawings.
The lock device includes a lock 1, a key 2 for operating the lock 1, and a latch 3 coupled to the lock 1. The lock 1 includes a case 4 fixed to the door D and the like, a rotor 5 and a drive member 6 housed in the case 4.

  The case 4 includes a cylindrical portion 7 that houses the rotor 5 and the driving member 6, and a front plate 8 that closes the front end of the cylindrical portion 7. The front plate 8 has a keyhole 8a and a display window 8b. A clutch protrusion 26 is formed on the inner periphery of the front end portion of the tubular portion 7.

  The rotor 5 is disposed rearward in the case 4, and has a latch shaft 9 projecting rearward of the case 4 so as to be rotatable forward and backward by 90 ° around the axis between the unlocked position and the locked position. The rotor 5 has a front end face 10 and a rear end face 11 orthogonal to the axis, and is held on the rear end face 11 so as not to move in the axial direction by a retaining ring 12. The latch 3 is fixed to the latch shaft 9. The rotor 5 includes a key protrusion 13 as a key coupling portion that protrudes forward from the peripheral edge portion of the front end surface 10, and a guide rod 14 that protrudes forward along the axis from the center portion of the front end surface 10. .

  The drive member 6 is disposed in front of the case 4 and is relatively rotatable between the unlocked position (FIG. 4A) and the locked position (FIG. 4B) in a range of approximately 90 ° around the axis. The spring 31 can be moved in the axial direction between the front restraint position (FIG. 3A) and the rear release position (FIG. 3B). It is urged to the restraining position (FIG. 3A). The drive member 6 has a front end surface 15 that faces the inner side surface of the front plate 8 of the case, and a rear end surface 16 that faces the front end surface 15 of the rotor 5, and each of the keys reaches a predetermined depth position from the front end surface. It includes a receiving notch 17, a rotation restricting notch 18, clutch recesses 18a and 18b, and a key groove 19 extending from the rear end surface to a predetermined depth position in the front. Further, the drive member 6 has a bearing hole 20 penetrating in the front-rear direction along the axis, and the guide rod 14 of the rotor 5 penetrates through this.

  The key receiving notch portion 17 is a passive engagement portion that receives the key 2 and receives the rotation of the key 2, and the locking direction abutting surface facing the arcuate inner peripheral surface 21 along the axis at an angle of approximately 90 ° around the axis. 22 and an unlocking direction contact surface 23. The bottom surface of the key receiving notch 17 is composed of an annular first bottom surface 24 around the bearing hole 20 and a sector-shaped second bottom surface 25 formed between the contact surfaces 22 and 23 at a rear position therefrom. The first bottom surface 24 serves as a pressure receiving surface that receives a backward pressing force by the key 2.

  The rotation restricting notch 18 is provided in a range of approximately 90 ° around the axis at the peripheral edge on the front end side of the drive member 6 and is deeply cut in the axial direction at positions 90 ° apart from each other. Clutch recesses 18a and 18b are provided. The rotation restriction notch 18 receives the clutch protrusion 26 of the case 4 and restricts the relative rotation angle of the drive member 6 within the 90 ° range of the rotation restriction notch 18. The clutch recesses 18 a and 18 b are clutch coupling portions that selectively mesh with the clutch protrusion 26 of the case 4 depending on the relative rotational position of the drive member 6. Further, on the front end surface of the drive member 6, a colored display portion 27 that displays the unlocked state is formed at a position corresponding to the display window 8 b of the front plate 8 when the rotor 5 is in the unlocked position.

  The shaft portion of the key 2 includes a cylindrical portion 28 that opens to the front end side so as to receive the guide rod 14 of the rotor 5, a wing portion 29 that protrudes radially from the outer periphery of the cylindrical portion 28, and the wing portion 29. And an engaging protrusion 30 that protrudes from the axial front end to the front end side longer than the front end of the tubular portion 28. The engagement protrusion 30 protrudes in the axial direction from a position away from the outer periphery of the cylindrical portion 28 in the radial direction. The tip of the key 2 has a cross-sectional shape that can be inserted into the key hole 8a.

  1, 2 </ b> A, and 4 </ b> A, the key 2 is inserted into the key hole 8 a, and the tip of the cylindrical portion 28 abuts against the pressure receiving surface 24 of the drive member 6. When the key 2 is further pushed in, as shown in FIG. 2B, the drive member 6 compresses the spring 31 and moves to the rearward release position, and the rear end face 16 of the drive member 6 moves to the front end face 10 of the rotor 6. Abut. At this position, the clutch recess 18 a is disengaged from the clutch protrusion 26 of the case 4, and rotation around the axis is possible within the range of 90 ° of the notch 18. In this state, when the key 2 is rotated to the right around the axis, the engagement protrusion 30 of the key 2 comes into contact with the contact surface 22 of the rotor 6, and the drive member 6 is rotated integrally with the rotor 5 in the clockwise direction. Let When the drive member 6 rotates 90 ° and the latch 3 together with the rotor 5 reaches the locked position, one end surface of the notch 18 comes into contact with the clutch protrusion 26 and stops. When the pressing of the driving member 6 by the key 2 is stopped at this position, the driving member 6 is moved to the front restraining position by the spring 31, and the clutch projection 26 is engaged with the clutch recess 18b (FIG. 4B). The key 2 can be rotated 90 ° to the left and pulled out from the key hole 8a. In the locked state, the clutch protrusion 26 is engaged with the clutch recess 18b, so that even if a tool is applied directly to the latch 3 to rotate it in the unlocking direction, this cannot be performed.

DESCRIPTION OF SYMBOLS 1 Lock 2 Key 3 Latch 4 Case 5 Rotor 6 Drive member 7 Cylindrical part 8 Front plate 8a Key hole 8b Display window 9 Latch shaft 10 Rotor front end surface 11 Rotor rear end surface 12 Retaining ring 13 Key protrusion 14 Guide rod 15 Front end surface 16 of driving member Rear end surface 17 of driving member Passive engagement portion (key receiving notch portion)
18 Notch 18a Clutch recess 18b Clutch recess 19 Key groove 20 Bearing hole 21 Arc-shaped inner peripheral surface 22 Locking direction contact surface (passive engagement portion)
23 Unlocking direction contact surface (passive engagement part)
24 Pressure receiving surface (first bottom surface)
25 Second bottom surface 26 Clutch projection 27 Colored display portion 28 Tube portion 29 Wing portion 30 Engagement projection portion 31 Spring D Door

Claims (3)

A locking device for locking and unlocking a door hinged to a fixed frame body,
A lock that is fixed to the door; a key that operates to lock and unlock the lock; and a lock that rotates forward and backward between a locking position that engages the fixed frame and an unlocking position that disengages from the fixed frame And a latch
The lock includes a front plate having a key hole and a cylindrical portion extending rearward of the front plate; the lock is relatively rotatable between the locked position and the unlocked position, and is not axially movable. A rotor disposed rearwardly in the cylindrical portion of the case; and capable of relative rotation about the axis between the locking position and the unlocking position, and moving in the axial direction between the front restraint position and the rear release position A drive member disposed in front of the cylindrical portion of the case as possible; and a spring interposed between the drive member and the rotor and biasing the drive member toward the front restraint position;
The case and the drive member each include a clutch coupling portion that meshes with each other when the drive member is in the restrained position and is disengaged when the drive member is in the released position;
The driving member and the rotor each include a key coupling portion that can move relative to each other in the axial direction.
The rotor further includes a latch shaft that protrudes rearward and is coupled to the latch;
The drive member further includes a pressure receiving surface that is disposed in front and receives a backward pressing force by the key; and a passive engagement portion that is disposed in front and engages the key in a rotational direction around an axis. And
The passive engagement portion of the drive member includes a locking direction contact surface and an unlocking direction contact surface that are opposed to each other at a position approximately 90 ° apart about the axis,
The rotor further comprises a guide bar protruding forward along its axis,
The drive member further includes a through hole that allows the guide rod of the rotor to pass therethrough and protrudes forward from the pressure receiving surface,
The key protrudes radially from the outer periphery of the cylindrical portion that opens to the front end side to receive the guide rod, and pushes the drive member to the release position, so that the key is moved to the right or around the axis. When rotating to the left, a wing portion configured to be in contact with either the locking direction contact surface or the unlocking direction contact surface and configured to rotate the drive member integrally with the rotor,
A locking device that performs locking / unlocking operation by inserting the key into the keyhole and rotating the driving member integrally with a rotor while pushing the driving member into a release position. The clutch coupling portion of the case is a clutch protrusion that protrudes from the inner periphery of the front end of the cylindrical portion,
The clutch coupling portion of the drive member is a clutch recess formed on the outer periphery of the front end portion so as to receive the clutch projection of the case at the restraining position and to disengage from the meshing projection at the release position. Item 2. The locking device according to Item 1. 2. The front plate of the case is provided with a display window, and the front surface of the drive member is provided with a colored display portion that is visible from the display window at a locked or unlocked position. Locking device.

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