JP2721244B2 - Sidebar cylinder lock - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device, particularly to a sidebar cylinder lock.

2. Description of the Related Art Since the invention of the tumbler tablet in 1848, various locking devices have been developed. Developed locking devices often have different lock structures and configurations from country to country in accordance with the anti-theft methods of each country.

Although not described in detail, the sidebar cylinder lock has a great resistance to so-called "picking" and "breaking" and has been developed mainly in the United States. For example, as shown in U.S. Pat.No. 3,080,744, a sidebar cylinder lock has a case having an accommodation hole formed in a longitudinal direction, and a key cylinder rotatably arranged in the accommodation hole. . The key cylinder is provided with a plurality of slots formed in the radial direction and a hole formed substantially at right angles to these slots. A plurality of tumblers are slidably disposed in each slot of the key cylinder and have a keyhole. A tumbler spring is disposed between each tumbler and the key cylinder and biases the tumbler outside the key cylinder. Each tumbler is provided with a contact portion at a different position. The side bar is slidably disposed in the hole of the key cylinder and in the locking groove of the case so as to be able to engage with the contact portion of the tumbler. The side bar is biased against the tumbler by a side spring.

In the above configuration, when a key is inserted into the sidebar cylinder lock, the tumbler is moved so that the contact portions of the tumblers are aligned in a straight line against the tumbler spring. For this reason, the end of the side bar fits into the contact portion of all the tumblers, and the side bar escapes from the engagement groove of the case. Thus, the side bar moves to the retracted position where it does not protrude from the key cylinder, so that the key can be rotated and unlocked. Since the sidebar cylinder lock has high mechanical strength against breakage and it is difficult to simultaneously move all tumblers to the desired position to engage with the sidebar at the time of unauthorized unlocking to the predetermined engagement position with the sidebar, High resistance to unauthorized unlocking.

On the other hand, when a regular key is inserted into a cylinder lock, it may be necessary to detect the key insertion and operate an electrical device. For example, U.S. Pat. No. 3,781,854 discloses an electronic anti-theft device. This electronic anti-theft device is shifted to an armed state when all the doors and hoods of the automobile are closed and locked. In the armed state, when the opening / closing part is opened without a proper key, the alarm device is activated. To stop the activated alarm device or switch the anti-theft device from the armed state to the armed release state where the alarm device does not operate (disarmed state or anti-theft release state), use a proper door lock device or ignition lock device. The key cylinder must be turned to the locked or unlocked position by inserting the key.

SUMMARY OF THE INVENTION In the above-described anti-theft device, when switching from the anti-theft state to the anti-theft release state with a regular key, this switching operation is switched as quickly as possible after inserting the regular key into the cylinder lock. It is desirable. For example, when the normal key is inserted into the cylinder lock and rotated to the lock position to switch from the anti-theft state to the anti-theft release state, the driver accidentally rotates the normal key to the unlock position and makes a mistake. It may take a long time to recognize the direction of rotation. Therefore, the operation of the alarm device continues until the key is turned to the lock position.

Further, anti-theft devices typically use a lock switch that is activated when the key is turned to a locked position to generate an electrical signal. The lock switch is shifted to the anti-theft state by an electric signal, and when rotated to the unlock position, the anti-theft state is released by an electric signal generated from the unlock switch. For this reason, a plurality of switches for detecting the rotation of the key cylinder at various positions such as the lock position, the neutral position or the unlock position of the key cylinder rotatably disposed inside the cylinder lock must be provided on the small cylinder lock. No. Therefore, in order to apply various electric signals to the anti-theft device, a plurality of switches must be attached to the cylinder lock.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sidebar cylinder lock for quickly detecting the insertion of a legitimate key while solving the above-mentioned drawbacks.

Means for Solving the Problems In the sidebar cylinder lock according to the present invention, a plurality of tumblers are arranged in a key cylinder accommodated in a case, and each tumbler is urged in one direction by a tumbler spring, and Sidebars are provided that abut against each tumbler due to elasticity. The movable piece of the detection switch is brought into contact with the side bar through the opening of the case and is operated by moving the side bar.

Action All tumblers move to the unlocked position when the proper key is fully inserted into the sidebar cylinder lock.
For this reason, the side bar contacts the contact part of the tumbler,
Since the movable piece moves inward from the locking groove of the case, the movable piece is moved by the movement of the side bar, and the key detection switch is operated. Thus, the key detection switch is operated only by inserting a regular key into the sidebar cylinder lock.

An embodiment of a sidebar cylinder lock according to the present invention will be described below with reference to FIGS.

The sidebar cylinder lock 10 has a case 14 and a key cylinder 17 rotatably housed in the case 14. The case 14 includes an accommodation hole 11 formed in the length direction, and the accommodation hole 11.
Tumbler groove 12 formed in the length direction
(FIGS. 3 and 4) and locking groove 13 (FIGS. 1 to 3)
And The key cylinder 17 has a key groove 17a formed in the length direction, a plurality of slots 15 formed in the radial direction, and a hole formed substantially at right angles to these slots 15.
With 16. The key cylinder 17 is rotatably arranged in the housing hole 11 of the case 14. The plurality of tumblers 19 are arranged so as to be slidable in each slot 15 of the key cylinder 17 and protrudable from the key cylinder 17 into the tumbler groove 12 of the outer case 14 and have a key hole 18. The tumbler springs 20 are arranged between each tumbler 19 and the key cylinder 17 and urge the tumbler 19 to the outside of the key cylinder 17.

The side bar 21 is mounted on the key cylinder 17 as shown in FIG.
The tumbler 19 is slidably disposed in the hole 16 and is engaged with a notch 25 formed as a contact portion at a different position of each tumbler 19. Although not shown in detail, each tumbler 19
The notch 25 is formed at a different position for each tumbler 19 with respect to the key hole 18 in order to give a key code to the key hole 18.
A key detection switch 26 is attached to the case 14, and the key detection switch 26 is a movable piece 27 that detects the movement of the sidebar 21.
Having. The movable piece 27 moves from the key detection switch 26 to the case 14
And is in contact with the side bar 21 through an opening 28 provided in the side bar 21.

As shown in FIGS. 1 and 6, a stainless steel cover 29 is attached to the front of the case 14 and is fixed to the case 14 by caulking. A side spring 22 is provided between a spring seat portion 21a formed at both ends of the side bar 21 and the lid 30.
The lid 30 is fixed to the key cylinder 17 adjacent to both ends of the hole 16 of the key cylinder 17. The side spring 22 biases the side bar 21 against the tumbler 19.

As shown in FIG. 3 and FIG.
When the key 31 is not inserted into the, the tumbler 19 protrudes into the tumbler groove 12 of the case. In the conventional sidebar cylinder lock, the tumbler groove from which the tumbler protrudes is not formed in the case. The side bar 21 projects into the locking groove 13 of the case 14.

Next, as shown in FIGS. 1 to 3, when the key 31 is inserted into the key groove 17a of the sidebar cylinder lock 10, the tumbler 1
The key is inserted into the key hole 18 of the ninth, and the tumbler 19 moves to the retracted position where it does not protrude from the key cylinder 17. Further, the side bar 21 is engaged with the notch 25 of each tumbler 19, and is moved to the retracted position shown in FIG. Can be rotated.

As is apparent from FIG. 3 showing a state where the key 31 is not inserted into the key groove 17a of the sidebar cylinder lock 10, the rotation of the key cylinder 17 is prevented by the sidebar 21 and the tumbler 19. For this reason, the strength against the illegal rotation of the key cylinder 17 can be increased by at least 50% compared to the related art due to the shear strength of the side bar 21 and the tumbler 19. The strength against this breakage actually depends on the shapes and dimensions of the side bar 21 and the tumbler 19. However, the practice of the present invention does not require the use of particularly small sidebars and tumblers. In other words, when obtaining the same strength as the conventional sidebar cylinder lock, according to this embodiment, the sidebar cylinder lock can be manufactured very small.

Generally, the sidebar 21 has a greater shear strength than the tumbler 19. For this reason, when an incorrect rotational force is applied to the key cylinder 17, the rotational force is first resisted by the side bar 21, and after the side bar 21 is deformed to some extent, the tumbler 19 is used to resist the rotational force. It is also possible.

When the key 31 is inserted into the key groove 17a, the key detection switch 26 moves and aligns the tumblers 19 and the side springs 22.
Due to the elasticity of, the side bar 21 moves, so that the key 31 is turned on without rotating the key 31. Therefore, the key detection switch 26 can be used as a switch for detecting that a regular key has been inserted. Conversely, even if a key other than the regular key is used, all the tumblers 19 do not simultaneously move to the unlock position, and the key detection switch 26 does not generate a signal.

In the above configuration, when the regular key 31 is sufficiently inserted into the sidebar cylinder lock 10, all the tumblers 19 move to the unlock position. Because of this, the side bar 21 comes into contact with the notch 25 as the contact portion of the tumbler 19 and moves inward from the locking groove 13 of the case 14, so that the side bar 21
The movable piece 27 is moved by the movement of 21, and the key detection switch
26 is activated. Thus, the key detection switch 26 is
It is activated simply by inserting the regular key 31 into the sidebar cylinder lock 10.

As described above, in the sidebar cylinder lock according to the present invention, an electric key detection signal is generated only by inserting a regular key, and it is necessary to rotate the key to generate the key detection signal. Absent. Therefore, when the side bar cylinder lock according to the present invention is used in combination with the electric anti-theft device, the anti-theft device can be smoothly operated regardless of the rotation direction of the key. Further, in the present invention, the key detection switch detects not only the key insertion / removal but also the insertion of the proper key, so that the key detection switch for the anti-theft device provided at the lock position and the unlock position is provided. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line AA of FIG. 3 showing a cross section of the sidebar cylinder lock according to the present invention without a key inserted therein, and FIG. 2 is a cross-sectional view of the sidebar cylinder lock having a key inserted therein. FIG. 3 is a sectional view taken along the line AA in FIG. 3, and FIG.
FIG. 4 is a sectional view taken along the line CC of FIG. 3, FIG. 5 is a sectional view of the key cylinder, and FIG. 6 is a sectional view of the sidebar cylinder lock according to the present invention. It is an exploded perspective view. 10: Sidebar cylinder lock, 11: Housing hole, 12: Tumbler groove, 13: Locking groove, 14: Case, 15: Slot, 16: Hole, 17: Key cylinder, 18 …… key hole,
19 tumbler, 20 tumbler spring, 21 sidebar, 22 side spring, 26 key detection switch, 27 movable piece,

Claims (1)

(57) [Claims] A plurality of tumblers are arranged in a key cylinder accommodated in a case, and each tumbler is urged in one direction by a tumbler spring, and a side bar is provided which comes into contact with each tumbler by elasticity of a side bar spring. A sidebar cylinder lock, wherein a movable piece of a detection switch is brought into contact with a sidebar through an opening of a case and is operated by moving the sidebar.