JPH0223666B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-theft device for a motor vehicle which issues an alarm when a cylinder lock fixed to a handle escutcheon of a motor vehicle door is broken.

Generally, a cylinder lock for operating a vehicle door lock is attached to the door. recently,
In view of weight reduction, ease of assembly, and design, a structure is adopted in which a handle escutcheon with a cylinder lock attached is inserted and fixed into a hole in the door panel. However, with this structure, the mounting strength of the cylinder lock is not sufficient for special breaking methods, and there is a risk that the cylinder lock may be broken and theft may occur.

The present invention prevents theft by using a special breaking method for the cylinder lock provided on the handle escutcheon, by activating a switch and issuing an alarm when the entire cylinder lock or a part of the cylinder lock moves from the handle escutcheon. The purpose is to

In order to achieve this object, the present invention includes a switch for detecting that the entire or part of the cylinder lock provided on the handle escutcheon has been moved due to breakage, and an alarm circuit activated by this switch.

Each example will be described below.

1 to 3, a handle escutcheon 1 provided with an outdoor bundle is fixed to an opening 3 formed in a door panel 2 of an automobile by a known method. Handle escutcheon 1
is integrally molded from synthetic resin or metal material.

A case 4 shown in FIG. 1 or 6 is integrally provided on the handle escutcheon 1 by an insert method or other method. The case 4 has a cylindrical cavity (not shown) inside, and a cylinder lock 5 is inserted into the cavity with the key hole exposed to the outside, and this cylinder lock 5 is fitted with a clip (not shown).
It is fixed inside this case 4 by.

As is well known, the cylinder lock 5 is composed of a sea cylinder C having a plurality of tumblers and a housing H having an axial groove for accommodating the key cylinder C and from which the tumblers protrude in the locked state.

A switch S is attached to the escutcheon 1 adjacent to the cylinder lock 5. The switch S has a socket 6 as a movable switch component fixed to the housing H, and the terminals of the socket 6 are connected to an alarm circuit A shown in FIG. Since the socket 6 is connected to a U-shaped jack 11 as a fixed switch component buried in the escutcheon 1, the switch S is turned on. The U-shaped jack 11 is electrically insulated from the escutcheon 1 as required. In the illustrated example, the socket 6 is fixed to the housing H, but it can also be attached to the key cylinder C.

Therefore, in the cylinder lock 5 consisting of the housing H and the key cylinder C, when the entire housing H of the cylinder lock 5 or the key cylinder C which is a part thereof is moved from the mounting position of the escutcheon 1 due to destruction. Switch S is turned off, the alarm circuit is activated, and the alarm device issues an alarm.

Referring to another embodiment shown in FIGS. 6 to 8, the switch S includes a casing 14 as a fixed switch component having an internal cavity.
, a plunger 15 as a movable switch component slidably disposed in this internal cavity, a spring 16 that presses the plunger 15 in one direction, and a pair disposed within the casing 14 and connected to the alarm circuit A. and an inner contact 18 fixed to the plunger 15 so as to be in contact with the outer contact 9 and having a U-shape. Switch S
is the escutcheon 1 as shown in Figures 6 and 7.
Fixed.

A stopper 17 is attached to the key cylinder C of the cylinder lock 5. This stopper 17 is loosely fitted to the end of the key cylinder C so that it does not rotate even when the key cylinder C is rotated by the key, but it moves together with the key cylinder C only when the key cylinder C moves in the axial direction. so lever 20 and E
It is held between Schilling 21.

One end of the stopper 17 is formed in a U shape, and this U
The tip 15a of the plunger 15 is brought into contact with the shaped groove 17', and after the assembly is completed, the plunger 15 is held in the retracted position shown in FIG. 8 by the stopper 17.
At this time, the outer contact 9 and the inner contact 18 come into contact and the switch 7 is turned on.

In the embodiment of FIGS. 1 to 4, when the housing H, ie the entire cylinder lock 5, moves inside the escutcheon 1 due to breakage, the switch S is switched off. Further, in the embodiment shown in FIGS. 6 to 8, when the key cylinder C, which is a part of the cylinder lock 5, moves due to breakage, the plunger 15, which is a moving component of the switch S, is moved by the spring 16.
Since the contact points 9 and 18 are separated, the switch S is turned off.

In the circuit shown in FIG. 9, when switch S is turned off, inverter I connected to alarm circuit A is turned on, transistor T is made conductive, and alarm L is activated. The alarm L is an acoustic or luminous alarm.

In the embodiment of the switch shown in FIG. 10, the contacts 9 and 18 are in a non-contact state when installed in an automobile, and when the cylinder lock is broken, the plunger 15 as a component of the moving switch comes off the stopper 17 and the contacts 9 and 18 are in a non-contact state. and 18 come into contact, and the switch S is turned on.

When the switch S is turned on, in this embodiment, the inverter I is omitted from the circuit of FIG. 9, and an input is directly applied to the base terminal of the transistor T, thereby activating the alarm.

As described above, the present invention provides a cylinder lock having a housing and a key cylinder and a switch adjacent to each other in the escutcheon of an automobile door handle, connects an alarm circuit to the switch, and comprises a fixed component and a movable component. The switch is switched by the movement of the movable component, and the movable component is connected to the cylinder lock, so when the cylinder lock attached to the handle escutcheon of the automobile door is broken. By operating the switch, an alarm can be issued to prevent theft.

[Brief explanation of drawings]

Fig. 1 is a plan view of the handle escutcheon to which the anti-theft device of the present invention is attached, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a side sectional view with the switch removed, and Fig. 4 is a sectional view taken along the line - - in Fig. 1. The figure is a plan view of the cylinder lock, Figure 5 is a side view of Figure 4, Figure 6 is a plane view of another embodiment, Figure 7 is a side sectional view of Figure 6, and Figure 8 is a cross section of the switch. Figure 9 is an alarm circuit diagram, 1st
Figure 0 is a sectional view showing another embodiment of the switch. 1... Escutcheon, 4... Case, 5... Cylinder lock, S... Switch, H... Housing, C... Key cylinder, A... Alarm circuit.

Claims (1)

[Claims] 1. A cylinder lock having a housing and a key cylinder and a switch are provided adjacent to each other in the escutcheon of an automobile door handle, and an alarm circuit is connected to the switch. An anti-theft device for an automobile, characterized in that the switch is switched by the movement of the switch, and the movable component is connected to the cylinder lock.