JPH03224880A - Steering lock device for motor scooter - Google Patents

Abstract

PURPOSE:To prevent surely foul unlocking by means of the insertion of a driver or the like, by releasing the integration of a key rotor and a cylinder body which has been done by a tumbler and making the key rotor alone rotatable, when a proper key is inserted into the key hole of the key rotor. CONSTITUTION:A steering lock device 21 provided at a head pipe at the front end of the scooter body frame of a scooter, makes a turning movement by inserting a key into a key hole 28, and allows the rotation of a key rotor 24 by releasing the operation of a tumbler 29, and a lock bar 31 is engaged with and disengaged from a steering shaft lock hole by means of this rotation through a joint 25 and a drive cam 25. In this instance, when the key rotor 24 is foully rotated by means of a driver or the like, it is so arranged that a cylinder body 23 is also rotated integrally. As a result, a base end lock bar 33 out of the lock bar 31 is integrally rotated with the cylinder body, and combination with a tip lock bar 34 is released, and the tip lock bar 34 is maintained at a lock condition.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a steering lock device for a motorcycle, and the invention relates to a steering lock device for a motorcycle, which prevents unlocking of a front fork device using a flathead screwdriver or the like. Relating to a locking device.

(Prior Art) A conventional steering lock device generally serves as a main switch, and the cylinder body 1 of the steering lock device shown in FIG. 7 is attached to a head pipe (not shown) via a mounting plate (not shown) or the like. It will be done. Insert an engine key (not shown) into the key hole 3 of the key rotor 2 in this steering lock device, rotate the engine key to a predetermined position (LOCK position), and lock the lock bar (not shown) to the head pipe and steering shaft (both not shown). By engaging the lock hole of
The front fork device is locked. Note that the reference numeral 4 in FIG. 7 indicates a tumbler.

(Problems to be Solved by the Invention) In the conventional steering lock device described above, for example, if a flathead screwdriver is driven into the key hole 3 of the key rotor 2 with a hammer or the like, and the flathead screwdriver is rotated using pliers or the like, the tumbler 4 If the key rotor is damaged, the key rotor may rotate, the lock bar may move backward, and the front fork device may be unlocked. Furthermore, since there is a risk that the main switch may also be turned on at this time, there is a risk that the motorcycle will be stolen.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a steering lock device for a motorcycle that can prevent the front fork device from being unlocked by a driver or the like, thereby avoiding theft of the motorcycle. shall be.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a cylinder body disposed within an apparatus body and rotatable by the action of a predetermined torque or more; and a tumbler, a key rotor integrated with the cylinder body by the tumbler, a conversion mechanism disposed within the cylinder body that converts the rotational movement of the key rotor into reciprocating movement, and a conversion mechanism connected to the conversion mechanism. a proximal end lock bar and a lock bar to which a distal end lock bar that can protrude from the device body is removably coupled, the cylinder body loosely fitting into the proximal end lock bar;
The cylinder body is rotated to rotate the proximal end lock bar, thereby disengaging the proximal end lock bar from the distal end lock bar.

(Function) Therefore, according to the steering lock device for a motorcycle according to the present invention, when a proper key is inserted into the key hole of the key rotor, the integration between the key rotor and the cylinder body by the tumbler is released, and only the key rotor is released. Rotate. This rotation is converted into a reciprocating motion of the lock bar through a conversion mechanism, so that the tip lock bar protrudes in and out of the device body, and when protruded, locks the front fork device.

In addition, if an incorrect key or flathead screwdriver is inserted into the key hole of the key rotor and a torque exceeding a specified level is applied to the key rotor, the key rotor is integrated with the cylinder body by the tumbler, so the cylinder body Rotate as one. As a result, the base end lock bar rotates integrally with the cylinder body, and the connection between the base end lock bar and the distal end lock bar is separated. At this time,
Since the distal end lock bar is held in that position, the front fork device can be maintained in a locked state when the proximal end lock bar protrudes.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a steering lock device for a motorcycle according to the present invention, and FIG. 5 is an overall side view showing a motorcycle (scooter) to which the steering lock device of FIG. 1 is applied. It is a diagram.

As shown in FIGS. 5 and 6, the scooter has a front wheel 1
The space between the handle 12 for operating the seat 1 and the seat 13 is deeply curved in a U-shape.

The seat 13 is attached to a vehicle body frame 14 formed in a curved shape.
located on the rear of the A head pipe 17 is fixed to the front end of this body frame 14.

A front fork device 18 including a handle 12 is attached to the head pipe 17. This front fork device 18 has a steering shaft 20 erected between two left and right front forks 19, and a handle 12 is fixed to the upper stage of this steering shaft 20. The front fork device 18 is provided with a steering shaft 20 passing through the head pipe so as to be rotatable in the left-right direction of the vehicle body.

Further, the rear wheel 15 is constructed integrally with an engine unit 16, and the engine unit 16 is supported by the vehicle body frame 14 by a shock absorbing unit (not shown) and is shock-suspended.

Now, the steering lock device 21 is attached to the head pipe 17 in the vehicle body frame 14. As shown in FIG. 1, this steering lock device 21 includes a cylinder body 23 rotatably disposed within a device body 22, and a key rotor 24 and a drive cam 25 rotatably mounted on the upper and lower parts of the cylinder body 23, respectively. It is housed and configured. These key rotor 24 and drive cam 25 are connected by a joint 26.

A key hole 28 into which an engine key 27 can be inserted is formed in the key rotor 24, and a tumbler 29 is installed therein. By operating this tumbler 29, the key rotor 24 is integrated with the cylinder body 23. key hole 28
By inserting and rotating a proper engine key 27, the operation of the tumbler 29 is released, and the key rotor 2
3 rotates. This rotation causes the drive cam 25 to rotate around the axis via the joint 26.

The driving cam 25 penetrates and is engaged with the driven cam 30, and the locking member 31 is fitted and connected to the driven cam 30.

The tumbler 29 and the driven cam 30 function as a conversion mechanism and convert the rotational motion of the key rotor 24 into reciprocating motion. Therefore, these driving cams 25 and driven cams 3
0, the lock par 31 reciprocates in the horizontal direction in FIG.

This lock par 31 moves forward, the tip of the lock par 31 protrudes from the device body 22, and the steering shaft 2
The front fork device 18 is locked by engaging with the lock hole 32 (FIG. 6).

The lock par 31 has, for example, a prismatic shape as shown in FIG. 4, and as shown in FIG.
The lock hole 32 of the steering shaft 20 protrudes from the
and a distal end lock par 34 that is engaged with. These proximal lock pars 33 and distal lock pars 3
4 are coupled by a coupling portion 35. This joint 35
As shown in FIGS. 2 and 3, the L-shaped coupling element 36 of the proximal end locking member 33 and the L-shaped coupling element 37 of the distal end locking member 34 are fitted together. This coupling portion 35 is provided so that it can be separated when the coupling elements 36 and 37 move in a direction parallel to the plane of FIG. 2 (in the direction of arrow A in FIG. 2).

Also, the coupling element 37 in the tip locking par 34
A stopper 38 is formed on the back surface of the holder.

This stopper 38 comes into contact with a stopper wall surface 39 of the device body 22 when the lockper 31 is protruded, and prevents the distal end lockper 34 from coming off when it is separated from the proximal end lockper 33.

On the other hand, the cylinder body 23 has, as shown in FIG.
A loosely fitting portion 40 is formed into which only the proximal end lockper 33 of the locker 31 is loosely fitted.

Further, as shown in FIG. 1, a torque limiter 41 is installed on the device body 22 at a position where it contacts the cylinder body 23. In this torque limiter 41, the steel ball 42 is
It is configured to be biased by a spring 43 embedded within the device body 22. By applying this biasing force to the cylinder body 23 by the steel ball 42, the cylinder body 23 is positioned at an appropriate position. The biasing force of the spring 43 holds the cylinder body 22 in that position when a proper engine key 27 is inserted into the key hole 28 of the key rotor 24 and the key rotor 24 is rotated. The size is set to allow rotation of the cylinder body 22 when the key rotor 24 is forcibly rotated with a torque greater than a predetermined torque by inserting a screwdriver or the like.

Next, the effects will be explained.

The appropriate engine key 27 fits into the key hole 28 of the key rotor 24.
When the key rotor 24 is inserted by the tumbler 29
The integration between the key rotor 24 and the cylinder body 23 is released, and only the key rotor 24 rotates.

This rotation is caused by joint 26. The lock bar 34 is converted into a reciprocating motion of the lock par 31 via the driving cam 25 and the driven cam 30, and the lock bar 34 at the tip of the lock par 31 is moved against the device body 2.
Protruding in and out from 2. When the tip lock par 34 protrudes, the tip lock par 34 engages with the lock hole 32 of the steering shaft 20, and the front fork device 18 is locked.

The key rotor 24 may be damaged if an inappropriate key, flat head screwdriver, etc. is inserted into the key hole 28 of the key rotor 24 by another person.
When a torque exceeding a predetermined torque is applied to the key rotor 24, the key rotor 24 is integrated with the cylinder body 23 by the tumbler 29, and the operation of the torque limiter 41 is released, so that the cylinder body 23 rotates together with the key rotor 24. At this time, since the proximal end lock bar 33 is loosely fitted into the loose fitting portion 40 of the cylinder body 23, the proximal end lock bar 33 rotates together with the cylinder body 23 in the direction of arrow A (FIG. 2). , the connection with the tip lockper 34 is released. At this time, the tip lock par 34 is held in that position by the locking of the stopper 38 and the stopper wall surface 39, so that if the tip lock par 34 protrudes, it can maintain its protruding state and lock the front fork device 18. The state can be ensured.

Moreover, even if someone else uses a screwdriver or the like to rotate the key rotor 24 and rotate the cylinder body 23 to shift the position of the base end lock bar 33 of the lock par 31, the torque limiter 41 also performs the positioning function. So,
By returning the cylinder body 23 and the base end lock bar 33 to their original proper positions, the steering lock device 21 can be reused.

Moreover, since this steering lock device 21 only changes the structure of the lock par 31 and cylinder body 23 of the conventional steering lock device and adds the device body 22 and torque limiter 21, an increase in cost can also be avoided.

〔Effect of the invention〕

As described above, according to the steering lock device for a motorcycle according to the present invention, the cylinder body is disposed within the device body and is rotatable by the action of a predetermined torque or more, and the lock pad 2 - is provided at the base end. The cylinder body loosely fits the proximal end lock bar, and the rotation of the cylinder body rotates the proximal end lock bar. The cylinder body and the base end lock bar are configured to be separated from each other, so even if someone inserts a screwdriver or the like into the key hole of the key rotor and applies more than a predetermined torque to the key rotor, the cylinder body and base end lock bar will not rotate. Just by doing this, the tip lockper can maintain the locked state. As a result, unlocking of the front fork device by a driver or the like can be prevented, and theft of the motorcycle can be avoided.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a steering lock device for a motorcycle according to the present invention, and FIG.
Figure 3 is an enlarged view of part ■ in Figure 1, Figure 4 is a sectional view taken along line IV-IV in Figure 1, Figure 5 shows the steering lock device in Figure 1. FIG. 6 is a perspective view showing the vehicle body frame of FIG. 5, and FIG. 7 is a partial sectional view showing a part of the conventional steering lock device. 21... Steering lock device, 22... Device body, 23... Cylinder body, 24... Key rotor, 25... Drive cam, 27... Engine key, 2
8... Key hole, 29... Tumbler, 30... Follower cam, 31... Lock par, 33... Base end lock bar, 34... Tip lock par, 35... Joint portion, 4
0... Loose fitting part, 41... Torque limiter, 42...
・Steel ball, 43...spring.

Claims (1)

[Claims] A cylinder body disposed within the device body and rotatable by the action of a torque exceeding a predetermined value; disposed within the cylinder body and provided with a keyhole and a tumbler; a key rotor; a conversion mechanism disposed within the cylinder body to convert rotational movement of the key rotor into reciprocating movement; a proximal lock bar connected to the conversion mechanism; and a distal lock bar protruding from the device body. a lock bar that is removably coupled to the cylinder body, the cylinder body loosely fits into the proximal lock bar, and rotation of the cylinder body rotates the proximal lock bar,
A steering lock device for a motorcycle configured to disconnect the base end lock bar from the distal end lock bar.