JP5291756B2 - lock - Google Patents

Description

  In railway vehicles, common locks (snipping locks) have been installed on cab doors, switchboard doors, and others for many years, and locking and unlocking operations are performed using a common key. The present invention relates to a lock 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. 6, the lock 31 has a latch shaft 33 disposed behind the front plate 32 having a key hole 32a. The latch shaft 33 includes an engaging portion 34 on the front end side, and further includes a guide bar portion 35 protruding forward from a front end 34a of the engaging portion 34.
The shaft 37 of the key 36 includes a cylindrical portion 38 that receives the guide bar portion 35 of the lock 31, and an engagement protrusion 39 that projects to the outer periphery of the cylindrical portion 38, and has a cross-sectional shape that fits into the key hole 32 a. The distal end portion of the engagement protrusion 39 projects rearward in the axial direction from the distal end of the cylindrical portion 38.
The engaging portion 34 of the latch shaft 33 has a locking direction contact surface 34b and an unlocking direction contact surface 34c at positions 90 ° apart from each other around the shaft.
The engagement protrusion 39 of the key 36 inserts the shaft 37 into the key hole 32a to a predetermined unlocking depth position (until the tip of the cylindrical portion 38 abuts the front surface 34a of the engagement portion 34 of the latch shaft 33). In this state, when it is rotated right or left around the shaft, the latch shaft 33 can be rotated by contacting any one of the contact surfaces 34b, 34c of the latch shaft 33. In the figure, the latch 40 is in the locked position. When the key 36 is inserted and rotated 90 degrees in the clockwise direction, the engaging projection 39 abuts against the abutting surface 34c of the latch shaft 33 and rotates it, bringing the latch 40 to the unlocked position. The The key 36 is returned 90 ° therefrom and removed from the keyhole 32a.
The applicant could not find prior art documents.

Conventionally, sneak locks installed in various places are locked and unlocked with a common key for many years, and thus are vulnerable to illegal key unlocking and theft. Therefore, it is desired to change the structure of the lock in order to increase security. However, even if a lock with a new structure is installed in the future, if there is no key that can be shared by a number of locks with an old structure that has already been installed, there is a risk that it will hinder business operations.
Therefore, the invention according to this application is a lock that cannot be locked / unlocked with a conventional key, and is a new key for locking / unlocking the lock, which can be locked / unlocked with no trouble even with an old lock. It is intended to provide.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
The lock of the invention according to this application for solving the above-described problems includes a lock 1 and a key 6 for operating the lock and unlocking. The latch shaft 3 of the latch 10 is disposed behind the front plate 2 having the key hole 2a. On the front end side of the latch shaft 3, an engaging portion 4 and a guide bar portion 5 protruding forward from the front end 4a of the engaging portion 4 are provided. The engaging portion 4 of the latch shaft 3 has a locking direction contact surface 4c and an unlocking direction contact surface 4b at positions 90 ° apart from each other around the shaft. The shaft 7 of the key 6 has a cylindrical portion 38 for receiving the guide rod portion 5 of the lock 1 on the distal end side, and projects from the outer periphery of the cylindrical portion 8 and protrudes rearward in the axial direction from the distal end of the cylindrical portion 8. It has a mating projection 9 and a cross-sectional shape that fits into the keyhole 2a. When the engaging protrusion 9 of the key 6 is inserted into the key hole 2a until the tip of the shaft 7 abuts the front surface 4a of the engaging portion 4 of the latch shaft 3, it is rotated right or left around the shaft. The latch shaft 3 is configured to be able to rotate by contacting any one of the contact surfaces 4 b and 4 c of the latch shaft 3. A restriction protrusion 11 protruding in the radial direction is provided on a part of the outer periphery of the guide rod portion 5 of the latch shaft 3. A notch 8a is formed in the cylinder portion 8 of the key 6 so that the shaft 7 can be inserted into the key hole up to a predetermined unlocking depth position while avoiding the restricting projection 11 of the latch shaft 3. Enables relative rotation of the shaft and latch shaft within the range of °. When the shaft 7 of the key 6 is inserted into the key hole 2a until the tip of the shaft 7 contacts the front surface 4a of the engaging portion 4 of the latch shaft 3, the engaging projection 9 However, the latch shaft 3 can be rotated by abutting against any one of the abutment surfaces 4 b and 4 c of the latch shaft 3.

  According to the invention relating to this application, a lock that cannot be locked and unlocked with a conventional key, and is a new key for locking and unlocking the lock that can be locked and unlocked without any trouble even with an old lock. Can be provided.

It is a schematic exploded perspective view of the lock concerning the present invention. It is the schematic perspective view which expanded a part of lock according to the present invention. It is a partial schematic perspective view showing the key of the lock according to the present invention and the key of the conventional lock in comparison. It is a figure explaining the applicability of the key with respect to the lock | rock which concerns on this invention. It is a figure explaining the applicability of a key by comparing and showing a lock according to the present invention and a conventional lock. It is a schematic exploded perspective view of the conventional lock.

Embodiments of the present invention will be described with reference to the drawings.
The lock consists of a lock 1 and a key 6 for operating the lock. The latch shaft 3 of the latch 10 is disposed behind the front plate 2 having the key hole 2a. The latch 10, the latch shaft 3, and a support frame (not shown) that supports them are fixed to the interior or inner surface of a door (not shown).

  On the front end side of the latch shaft 3, a concentric engaging portion 4 and a concentric guide rod portion 5 protruding forward from the front end 4a of the engaging portion 4 are provided.

  The engagement portion 4 of the latch shaft 3 has a shape in which a part of a cylinder is cut out, and has a locking direction contact surface 4c and an unlocking direction contact surface 4b at positions 90 ° apart from each other around the shaft. .

  A restriction protrusion 11 protruding in the radial direction is provided on a part of the outer periphery of the guide rod portion 5 of the latch shaft 3. In the illustrated embodiment, a restriction projection 11 is provided on the front surface 4 a of the engaging portion 4 on the outer periphery of the base portion of the guide rod portion 5.

  The shaft 7 of the key 6 has a cylindrical portion 38 that receives the guide rod portion 5 of the lock 1 on the distal end side. Engaging protrusions 9 having a cross-sectional shape that fits the keyhole 2a protrude from the outer periphery of the cylindrical portion 8. The engagement protrusion 9 protrudes rearward in the axial direction from the tip of the cylindrical portion 8.

  A cutout portion 8 a is formed in the cylindrical portion 8 of the key 6. The notch 8a is for avoiding contact with the restricting projection 11 of the latch shaft 3 when the key 6 is inserted into the key hole 2a. The shaft 7 can be inserted into the keyhole 2a (until the tip of 8 abuts the front surface 4a of the engaging portion 4 of the latch shaft 3), and the relative relationship between the shaft 7 and the latch shaft 3 is within a range of 90 °. Enable rotation.

  In FIG. 1, the latch 10 is in the locked position. When the shaft 7 of the key 6 is inserted into the key hole 32a until the tip of the cylindrical portion 38 comes into contact with the front surface 4a of the engaging portion 4 of the latch shaft 3, the shaft 7 is engaged by rotating 90 degrees clockwise. The protrusion 9 comes into contact with the contact surface 4c of the latch shaft 3 and rotates it, thereby bringing the latch 10 to the unlocked position. The key 6 is returned 90 ° therefrom and removed from the keyhole 32a. The latch 10 is held in a locked position or an unlocked position by a holding mechanism (not shown). To bring the latch 10 to the locked position, the reverse operation is performed.

  In FIG. 4, when a rotation operation is attempted with respect to the latch shaft 3 using the conventional key 36, the tip of the shaft 37 comes into contact with the restricting projection 11, so that it comes into contact with the front surface 4 a of the engaging portion 4. Absent. For this reason, the front-end | tip part of the engagement protrusion 39 does not hook on the contact surface of the engagement part 4, Therefore, The latch shaft 3 cannot be rotated. FIG. 5 shows the applicability of the keys 6, 36 to the locks 1, 31 with solid arrows. A dotted arrow indicates that it is not applicable.

  On the other hand, the key 6 can be applied to a conventional lock 31 that does not have the restricting projection 11 as shown by a solid line arrow in FIG. For this reason, even when the lock 1 according to the present invention is newly installed, the key 6 can be applied to the conventional lock 31 already installed in many places, which may hinder the execution of business. Absent.

DESCRIPTION OF SYMBOLS 1 Lock 2 Front plate 2a Key hole 3 Latch axis | shaft 4 Engagement part 4a Front end 4b Unlocking direction contact surface 4c Locking direction contact surface 5 Guide bar part 6 Key 7 Shaft 8 Tube part 8a Notch part 9 Engagement protrusion 10 Latch 11 Restriction protrusion

Claims (1)

A latch having a latch shaft disposed behind a front plate having a key hole, an engaging portion on a front end side of the latch shaft, and a guide rod portion protruding forward from the front end of the engaging portion;
A cylindrical portion for receiving the guide rod portion of the lock is provided on the distal end side, an engagement protrusion is formed on the outer periphery of the cylindrical portion and protrudes in the axial direction from the distal end of the cylindrical portion, and fits the keyhole. Consisting of a key with an axis with a cross-sectional shape,
The engaging portion of the latch shaft has a locking direction contact surface and an unlocking direction contact surface at positions 90 ° apart from each other around the shaft,
When the key engagement protrusion is rotated right or left around the shaft in a state where the shaft is inserted into the key hole to a predetermined unlocking depth position, the contact surface of either of the latch shafts In the lock configured to be able to rotate the latch shaft in contact with the
A restriction protrusion protruding in the radial direction is provided on a part of the outer periphery of the guide rod portion of the latch shaft,
The cylindrical portion of the key allows the shaft to be inserted into the key hole up to a predetermined unlocking depth position while avoiding the restricting projection of the latch shaft, and the shaft and the latch shaft within a range of 90 °. A lock having a notch that allows relative rotation with the lock.

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