Steering lock device

The present invention relates to a steering lock device.

A device described in Patent Document 1 has been known as a steering lock device configured such that a mounted member such as a switch is fixed to a frame housing a cylinder lock and a lock body.

In this conventional example, as shown in FIG. 15 , the frame of the steering lock device is provided with an opening part (mounting hole) that is cut from a front open end of the frame, and a key detection switch is mounted in this mounting hole.

Patent Document

Patent Document 1: Japanese Patent Application Publication No. Hei 10-61285

Problem to be Solved by the Invention

Here, in the above conventional example, the mounting hole is formed in a cut-out shape open at one end. For this reason, if a force is applied to the side edges of the mounting hole in a widening direction, the mounting hole is widened, which leads to a possibility of improper access to the cylinder lock inside.

The present invention has been made to solve the above drawback and an object thereof is to provide a steering lock device that can prevent improper access to a cylinder lock due to deformation of a mounting hole formed in a cut-out shape.

Means for Solving the Problem

According to the present invention, the above object is achieved by providing a steering lock device, including:

a frame 4 that includes a cylindrical section 1 open at one end, and that houses a lock body 3 which moves in and out of a steering column as a result of manipulation of a cylinder lock 2 fixed in the cylindrical section 1 ; and

a mounted member 6 that is mounted in a mounting hole 5 which is formed in a cut-out shape in the cylindrical section 1 and open at one end to the open end of the cylindrical section 1 , in which

at opposite side edges of the mounting hole 5 , to-be-locked parts 9 are provided that restrict deformation of the mounting hole 5 in a widening direction by being locked in a circumferential direction within the frame 4 with locking parts 8 of an inserted member 7 inserted in the cylindrical section 1 .

In the present invention, the opposite side edges of the mounting hole 5 for the mounting of the mounted member 6 are locked with the locking parts 8 of the inserted member 7 and are practically in a coupled state, so that the cantilevered state is solved. This results in an increase in the resistance against external force that tries to widen the clearance between the opposite side edges of the mounting hole 5 . Hence, it is possible to prevent improper access to the cylinder lock 2 inside due to deformation of the mounting hole 5 .

Also, since the locking parts 8 and the to-be-locked parts 9 are locked inside the frame 4 , access to their locking points can be effectively prevented as well.

Further, the mounted member 6 of the steering lock device can be configured such that it includes locking protrusions 11 that lock with locking grooves 10 formed in the inserted member 7 to thereby restrict detachment of the mounted member 6 in a radial direction of the frame 4 .

The mounted member 6 may be fixed with appropriate additional fixing members to restrict its detachment in the radial direction of the frame 4 . However, according to the present invention, the work of mounting the mounted member 6 can be done simply by: sub-assembling the mounted member 6 in advance such that the locking protrusions 11 locks with the locking grooves 10 of the inserted member 7 ; and then inserting this sub-assembly into the cylindrical section 1 . Hence, the efficiency of the assembling is improved.

Also, while locking with the locking grooves 10 of the inserted member 7 , the locking protrusions 11 are covered by the inserted member 7 and the frame 4 . Thus, it is possible to prevent an improper destructive act of attacking the locking protrusions 11 .

Further, the steering lock device can be configured such that the locking parts 8 are formed integrally with a case 12 of the cylinder lock 2 .

For the inserted member 7 , for example, a cap member or the like may be used that closes the front open end of the cylindrical section 1 . However, by forming the locking parts 8 integrally with the case 12 of the cylinder lock 2 , the case 12 of the cylinder lock 2 is formed as the inserted member 7 . Hence, the configuration as a whole can be simplified.

Also, the steering lock device can be configured such that it includes:

a frame 4 that includes a cylindrical section 1 open at one end toward a front side;

a lock body 3 that moves in and out of a steering column as a result of manipulation of a cylinder lock 2 which is inserted in the cylindrical section 1 from the front open end thereof and fixed to the frame 4 ; and

a key detection switch that is inserted into a mounting hole 5 in the cylindrical section 1 from the front open end thereof and that detects a state where an unlocking key is inserted in the cylinder lock 2 , the mounting hole 5 being formed in a cut-out shape open to the front open end of the cylindrical section 1 , in which

a case 12 of the cylinder lock 2 is provided with locking parts 8 that, while the cylinder lock 2 is inserted in the cylindrical section 1 , lock with to-be-locked parts 9 protruding from opposite side edges of the mounting hole 5 , to thereby restrict widening of the mounting hole 5 .

Effect of the Invention

According to the present invention, the opposite side edges of the mounting hole, which is formed in a cut-out shape, are coupled to each other by using the inserted member. This improves the resistance against the widening deformation of the mounting hole. Hence, it is possible to prevent improper access to the cylinder lock due to the deformation of the mounting hole.

FIG. 1 is a cross-sectional view showing the present invention.

FIG. 2 is a perspective exploded view of FIG. 1 .

FIG. 3 is a set of views showing a mounted state of a mounted member, and part (a) is a side view, part (b) is a view seen in the direction of arrow 3 B in part (a), and part (c) is a cross-sectional view of an assembled state.

As shown in FIG. 1 and the following figures, a steering lock device includes a cylinder lock 2 housed in a frame 4 and an ignition switch 13 that is fixed to the frame 4 and performs switch operation when the cylinder lock 2 is manipulated. The steering lock device is fixed to a steering column not shown with a fixer member 14 .

The cylinder lock 2 is formed by inserting a plug 2 a into a case 12 , and the plug 2 a can be turned inside the case 12 with a correct unlocking key (not shown) inserted in the plug 2 a . This cylinder lock 2 is inserted and mounted in a cylindrical section 1 of the frame 4 open at the front end thereof. At the front end of the case 12 of the cylinder lock 2 , a cap section 12 a is formed that has an outer diameter substantially equal to the outer diameter of the cylindrical section 1 and closes the front open end of the cylindrical section 1 when inserted in the cylindrical section 1 . Through not shown, key position marks such as “LOCK,” “ON,” “ACC,” and “START” are written on the cap section 12 a.

A rotator 15 which can be coupled at the rear end to a rotational terminal (not shown) on the ignition switch 13 is coupled to the plug 2 a of the cylinder lock 2 in a rotational direction. The ignition switch 13 can be manipulated through manipulation of turning the plug 2 a to a predetermined key position.

Moreover, a cam part 15 b is formed at a middle section of the rotator 15 , and a lock body 3 is disposed with its follower part 3 a in pressure contact with the cam part 15 b . The lock body 3 is slidable in a direction perpendicular to the rotational center of the rotator 15 , i.e. the plug 2 a , and is urged by a compression spring 16 in a direction in which the follower part 3 a is in pressure contact with the cam part 15 b.

Thus, in this embodiment, when the plug 2 a is at a “LOCK” position, a lock part 3 b of the lock body 3 projects from the frame 4 as shown in FIG. 1 and locks with a steering shaft not shown inside the steering column, thereby restricting turning manipulation of the steering shaft.

In response to turning manipulation of the plug 2 a in this state in an “ON” direction with the correct unlocking key, the lock part 3 b is retracted into the frame 4 , thereby unlocking the steering shaft.

Further, a key detection switch (mounted member 6 ) is mounted to the frame 4 . As shown in FIG. 1 , the key detection switch 6 includes a movable projection 6 b projecting from a housing 6 a with suitable urging force. The key detection switch 6 is capable of detecting whether the movable projection 6 b is in the projecting state or a retracted state, based on disconnection and connection of a contact not shown housed in the housing 6 a.

For the purpose of mounting this key detection switch 6 , a mounting hole 5 is bored in the frame 4 , penetrating from the outer surface of the frame 4 to the inside of the frame 4 . The movable projection 6 b comes in contact with the plug 2 a while the key detection switch 6 is mounted in the mounting hole 5 . A slider housing hole 2 b is bored in the plug 2 a in a region where the plug 2 a comes in sliding contact with the movable projection 6 b . The slider housing hole 2 b positionally coincides with the movable projection 6 b when the plug 2 a is at the “LOCK” position. A slider piece 17 is mounted in the slider housing hole 2 b movably in the radial direction.

As shown in FIG. 1 , while the plug 2 a is at the “LOCK” position without the unlocking key inserted in a key insertion groove 2 c in the plug 2 a , the movable projection 6 b of the key detection switch 6 is projecting from the housing 6 a . When the unlocking key is inserted in this state, the movable projection 6 b is pushed by the unlocking key toward the outer periphery of the plug 2 a , so that the key detection switch 6 detects the state where the unlocking key is inserted. If the driver, for example, tries to leave the vehicle in this state, a warning signal is outputted that informs the driver that the key is left inside.

As shown in FIGS. 2 and 3 , the mounting hole 5 for mounting the key detection switch 6 is formed in a cut-out shape open at one end to the open end side of the cylindrical section 1 . The key detection switch 6 can be mounted by inserting it into the mounting hole 5 from this open end side.

Moreover, to-be-locked parts 9 are provided on opposite side edges of the mounting hole 5 , the to-be-locked parts 9 protruding toward the center. On the other hand, locking parts 8 are provided on the case 12 of the cylinder lock 2 , which is inserted into the cylindrical section 1 from the open end thereof. When the cylinder lock 2 is inserted, the to-be-locked parts 9 are locked with the locking parts 8 of the case 12 , which functions as an inserted member 7 , so that circumferential movement is restricted. This allows improved resistance against deformation of the mounting hole 5 that brings the opposite side edges of the mounting hole 5 outwardly away from each other and widens the mounting hole 5 .

Further, the housing 6 a of the key detection switch 6 includes locking protrusions 11 on opposite side edges of the lower end thereof, while locking grooves 10 with which the locking protrusions 11 can lock are formed in the case 12 of the cylinder lock 2 . The key detection switch 6 is held at an appropriate position on the case 12 by sliding the locking protrusions 11 into the locking grooves 10 .

Thus, in this embodiment, the key detection switch 6 is mounted by: firstly sub-assembling the key detection switch 6 such that it is held on the cylinder lock 2 ; and then inserting this sub-assembly into the cylindrical section 1 of the frame 4 . In the state where the sub-assembly is inserted in the cylindrical section 1 and fixed to the frame 4 , the locking of the locking protrusions 11 in the locking grooves 10 restricts radial movement of the key detection switch 6 , and also the cap section 12 a of the cylinder lock 2 restricts forward movement of the key detection switch 6 . Hence, the key detection switch 6 is held at a predetermined position without using any fixing members such as screws.

Moreover, as described above, while the cylinder lock 2 is fixed, the locking grooves 10 and the to-be-locked parts 9 are coupled to each other by the locking parts 8 , which reinforces the locking parts 9 and thereby prevents the deformation of the mounting hole 5 in the widening direction. Hence, improper access can be prevented.

1 Cylindrical Section

2 Cylinder Lock

3 Lock Body

4 Frame

5 Mounting Hole

6 Mounted Member

7 Inserted Member

8 Locking Part

9 To-Be-Locked Part

10 Locking Groove

11 Locking Protrusion

12 Case