JPH0332220Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention (field of industrial application) This invention relates to a cylinder lock in which the electronic circuit for locking and unlocking the lock is operated by inserting and removing a key.

(Prior art and issues to be solved) There is a device that controls the operation of an anti-theft device by inserting a key into the lock and turning it to generate a lock signal in the locked position and an unlock signal in the unlocked position. They are becoming increasingly used, and this trend is also becoming noticeable in locking mechanisms installed on automobile doors and handles.

The circuit that controls locking/unlocking by inserting/removing and rotating the key usually includes a limit switch,
Usually, hardware such as magnetic switches and reed switches are installed, but with this method, there is a risk that rainwater and dust may enter through the hardware, so waterproofing measures may need to be taken. However, when arranging it at a predetermined position, it takes a lot of time to adjust it, which deteriorates the workability.

In order to avoid such problems, some proposals have been made that use electronic circuits using Hall elements, LED elements, etc.; Since current flows even when there is no power, the battery is inevitably exhausted.

The present invention was developed in view of the current situation, and provides a cylinder lock that does not consume unnecessary current because the circuit becomes conductive only when the key is inserted into the cylinder lock. The purpose is to

(2) Structure of the invention (technical means for solving the problem and its effects) In order to achieve the above purpose, the invention includes a cylinder and a housing surrounding the cylinder.
In a cylinder lock configured such that a key is inserted into and removed from a key groove formed in the cylinder, a pressurized conductive rubber is stored in a recess formed on the outer peripheral surface of the housing, and a through hole communicates the bottom of the recess and the key groove. at least two pressure members are disposed in the through hole, and one end of the pressure member is in contact with the pressurized conductive rubber in a normal state,
It is characterized in that the other end is configured to be exposed to the keyway.

With this configuration, the current used by the lock control circuit can be kept to a minimum without requiring special hardware due to the extremely simple configuration and without the risk of poor contact.

(Description of Embodiments) FIG. 1 is a cross-sectional view of a main part of a cylinder lock showing an embodiment of the present invention, in which a tumbler 1 is installed inside a housing 2 of a cylinder lock 1 by rotating it with a key K.
A cylinder 10 for operating 3 is installed inside.

A recess 3 is formed in the housing 2 surrounding the cylinder 10, and a pressurized conductive rubber 4 is attached to the recess 3, which exhibits insulating properties under normal conditions and exhibits conductivity when pressurized. be.

It is assumed that conductive wires 5, 5 are connected to the pressurized conductive rubber 4, and these are connected to a control means (not shown).

A through hole 6 reaching the cylinder 10 is formed in the bottom 3' of the recess 3, and a through hole 11 is formed in the housing 2, which is connected to the through hole 6 and reaches the keyway 12. Pressure member 7,
A second pressure member 8 and a third pressure member 9 are provided, and the key groove side end of the third pressure member 9 is tapered as shown.

Each of the pressure members is configured such that the taper portion of the third pressure member 9 on the keyway side is exposed to the keyway in a normal state.

With this configuration, the keyway 12
As you insert the key K into the
The pressure member 9 comes into contact with the tapered portion at the tip of the pressure member 9, further presses the pressure member, and retreats into the through hole 11 as shown by the chain line in the figure. The first pressing member 7 is displaced through the first pressing member 7, which presses the pressing conductive rubber 4 to make it conductive, thereby energizing a control circuit (not shown).

As shown in FIG. 3, even when the key K is rotated, in the case of the illustrated device, the first pressure member 7 is moved to the cylinder 1.
Since the pressurized conductive rubber 4 rests on the outer surface of the pressurized conductive rubber 4 and maintains the pressed position, there is no change in the properties of the pressurized conductive rubber 4.

When the key K is returned to the removal position and then pulled out from the cylinder, each pressure member 7, 8, 9 returns to its previous position due to the elasticity of the pressurized conductive rubber 4, and the pressurized conductive rubber becomes insulating. As a result, the control circuit (not shown) is not energized.

With this configuration, the control circuit is energized only when the key is inserted into the cylinder lock, so this can be used in automobile locks to minimize battery wear and tear. Is possible.

Of course, it goes without saying that the present invention can be applied not only to locks for automobiles, but also to locks installed in various locations.

(3) Effects of the invention As explained above, according to the invention, a key can be attached to a cylinder lock without the need for special hardware or additional mechanisms by simply disposing the pressurized conductive rubber on the lock itself. Since it is possible to energize the control circuit only when the connector is inserted, the energization can be reliably controlled without causing poor contact or the like with a simple configuration, thereby eliminating wasted current.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part of a cylinder lock showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. 1, and Fig. 3 is a cylinder lock from the position shown in Fig. 2. FIG. 1...Cylinder lock, 2...Housing, 3...
Recessed portion, 4... Pressure conductive rubber, 7, 8, 9... Pressure member, 10... Cylinder, K... Key.

Claims (1)

[Scope of Claim for Utility Model Registration] A cylinder lock comprising a cylinder and a housing surrounding the cylinder, and configured such that a key is inserted into and removed from a key groove formed in the cylinder, wherein a recess formed in the outer peripheral surface of the housing A pressurized conductive rubber is housed, a through hole is formed that communicates the bottom of the recess and the key groove, and at least two pressurizing members are disposed in the through hole, and in a normal state, the pressurizing member is . A cylinder lock configured such that one end abuts the pressurized conductive rubber and the other end is exposed in the keyway.