JPH03224879A - Steering lock device for motor scooter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 that locks a front fork device to prevent the motorcycle from being stolen.

(Prior Art) A conventional steering lock device generally serves as a main switch, and the steering 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). ), the front fork device is locked (steering lock). Note that in FIG. 7, reference numeral 4 indicates a tumbler.

(Problem to be Solved by the Invention) In the conventional steering lock device as 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 can be locked. There is a risk that the key rotor may be damaged, the key rotor may rotate, the lock bar may move backward, and the front fork device may be unlocked. Moreover, since the main switch is also turned on, there is a risk that the motorcycle will be stolen.

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a steering lock device for a motorcycle that can prevent the device from being destroyed and avoid theft of the motorcycle.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, when a key is inserted into a key hole of a key rotor disposed in a cylinder body and rotated, a lock bar protrudes from the cylinder body to lock a front fork device. In the steering lock device for a motorcycle, a guard member is fixed to the cylinder body at a position above the key rotor, a guard portion key groove into which the key can be freely inserted is formed in the guard member, and the guard member is characterized in that it is constructed with high hardness so that it will not be damaged even when a screwdriver or the like is inserted into the keyway of the guard portion.

(Function) Therefore, according to the steering lock device for a motorcycle according to the present invention, even if someone tries to forcibly rotate the key rotor using a screwdriver or the like, the highly hard guard member covers and protects the key rotor. Moreover, since this guard member is fixed to the cylinder body, it is impossible to destroy the guard member with a screwdriver or the like. Therefore, it is possible to prevent the front fork device from being unlocked by forcibly rotating the key rotor and damaging the tumbler, thereby avoiding theft of the motorcycle.

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

FIG. 1 is a longitudinal sectional view showing one embodiment of a steering lock device for a motorcycle according to the present invention, and FIG. 4 is an overall side view showing a motorcycle (scooter) to which the steering lock device of FIG. 1 is applied. It is.

As shown in FIGS. 4 and 5, 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 arranged on the rear part of a vehicle body frame 14 formed into a curved shape. 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 end of the steering shaft 20. The front fork device 18 is provided with a steering shaft 20 passing through the head pipe 17 so as to be rotatable in the left-right direction of the vehicle body.

Further, the rear wheel 15 is integrally configured 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, in this steering lock device 21, a key rotor 23 and a drive cam 24 are rotatably housed in the upper and lower parts of a cylinder body 22, respectively.
are combined by Further, a guard portion 33 (described later) as a guard member is fixed to the cylinder body 22 above the key rotor 23 .

A key hole 27 into which an engine key 26 can be inserted is formed in the key rotor 23, and a tumbler 28 is installed therein. When a proper engine key 26 is inserted into the key hole 27 and rotated, the operation of the tumbler 28 is released and the key rotor 23 rotates, and this rotation rotates the drive cam 24 around the axis via the joint 25.

The drive cam 24 penetrates and is engaged with the driven cam 29, and the lock bar 30 is fitted into the driven cam 29. The lock par 30 is provided so as to be movable back and forth in the left and right horizontal directions in the figure via the driven cam 29 by the rotation of the drive cam 24 around the axis.

This lock par 30 also reciprocates within a lock bar guide portion 31 that forms a part of the cylinder body 22. This lock bar guide portion 31 is molded integrally with the cylinder body 22. The lock par 30 moves forward within the lock bar guide portion 31, projects to the position shown by the two-dot chain line in FIG. Locked (steering lock).

By the way, as shown in FIG. 1, the guard portion 33 fixed above the key rotor 23 is made of a material having a hardness and strength higher than that of a screwdriver so that it will not be damaged by a screwdriver or the like. This guard part 33
has a thick-walled, approximately cylindrical shape, and has second
A protrusion 34 as shown in the figure is integrally molded. The guard portion 33 is fixed to the cylinder body 22 by casting or the like,
These protrusions 34 prevent the cylinder body 22 from being removed from the cylinder body 22 and prevent the cylinder body 22 from rotating.

The guard portion 33 also includes the OFF position of the ignition switch by the key rotor 23 and the key rotor 2
At the LOCK position 3, a guard key groove 36 is formed, which allows the engine key shown in FIG. 3 to be inserted and extracted. In this embodiment, the guard part key groove 36 has a cross-shaped planar shape as shown in FIG. 2, and is configured to penetrate through the upper and lower surfaces of the guard part 33 as shown in FIG.

Here, as shown in FIG. 3, the engine key 26 includes a grip portion 37, a constriction portion 38, and an operation portion 39, and the grip portion 37 is gripped by the rider. Operation part 3
Reference numeral 9 denotes a portion that is inserted into the key hole 27 of the key rotor 23 and engaged with the tumbler 28 to activate or deactivate the tumbler 28.

Further, the constricted portion 38 has a cylindrical shape, and its diameter d is
The diameter of the center part of the guard key groove 36 in the guard member 3 is smaller ((d<D). The axial length B of the constricted part 38 is larger than the height A of the guard part 33 ((B
AA) Set.

Therefore, the engine key 26 is rotatable within the guard part key groove 36 of the guard part 33, and the key rotor 23 is rotated by the operation part 39 of the engine key 26 after the operation of the tumbler 28 is released. Further, the constricted portion 38 of the engine key 26 is configured to have a strength that can be broken with a strength that is less than the breaking torque of the tumbler 28.

According to the above embodiment, even if someone tries to forcibly rotate the key rotor 23 using a screwdriver or the like, the guard portion 33 whose hardness is higher than that of the screwdriver or the like covers and protects the key rotor 23. Since the guard portion 33 is fixed to the cylinder body 22, the guard portion 33 cannot be destroyed. Therefore, it is possible to prevent a driver or the like from forcibly rotating the key rotor 23, damaging the tumbler 28, and unlocking the front fork device, thereby avoiding theft of the motorcycle.

Moreover, when the hardness of the guard part 33 is made higher than that of the drill, the guard part 33 cannot be destroyed by the drill, so it is possible to prevent the steering lock device 21 from being damaged by the drill.

Therefore, theft of the scooter can be avoided.

Further, since the key rotor 23 is covered by the guard portion 33, it is impossible to apply torque to the key rotor 23 using a special tool. Therefore, the front fork device 21 cannot be unlocked even by a picking operation in which a torque is applied to the key rotor 23 using a special tool, and the tumbler 28 is sequentially mounted with a long and thin pin to unlock the lock.

Furthermore, even if a thin plate unauthorized tool with a constricted part without a stepped key shape is used, the breaking torque of the tumbler 28 is set to be higher than the fracture torque of the constricted part of the unauthorized tool, so the constricted part of the unauthorized tool is placed first. It is broken, and it is impossible to unlock it with this unauthorized tool.

Moreover, since the guard part key groove 36 is not formed in the guard part 33 at the ON position of the ignition switch by the key rotor 23, the engine key is not only prevented from being removed by catching on the tumbler 28, but also by the guard part 33. will be stopped.

Therefore, it is ensured that the engine key cannot be removed in the ON position.

FIG. 6 is a partial sectional view of a steering lock device showing another embodiment. In this other embodiment, the same parts as those in the previous embodiment are designated by the same reference numerals, and a description thereof will be omitted.

In this other embodiment, a cover portion 40 is used as a guard member in place of the guard portion 33 of the previous embodiment. The cover part 40 is attached to cover the upper part of the cylinder body 22 in which the key rotor 23 is housed, and
It is fixed to the cylinder body 22 by. This cover portion 40 is also constructed to have a hardness and strength higher than that of a driver or the like.

1. Therefore, this other embodiment also has the same effect as the one embodiment described above.

〔Effect of the invention〕

As described above, according to the steering lock device for a motorcycle according to the present invention, a guard member is fixed to the cylinder body at a position above the key rotor, and the guard member has a guard portion key groove into which the key can be freely inserted. At the same time, the guard member is made of high hardness that will not be damaged even if a screwdriver or the like is inserted into the guard key groove, so that even if someone tries to forcibly rotate the key rotor using a screwdriver or the like, the guard member will not be damaged. , the guard member cannot be destroyed. Therefore, destruction of the steering lock device can be prevented, and theft of the motorcycle can be avoided.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a steering lock device for a motorcycle according to the present invention, and FIG.
3 is a front view showing the engine key used in the steering lock device shown in FIG. 1, and FIG. 4 is an overall view of a motorcycle (scooter) to which the steering lock device shown in FIG. 1 is applied. A side view, FIG. 5 is a perspective view showing the body frame of the scooter shown in FIG. 4, and FIG.
The figure is a partial sectional view showing a part of a steering lock device in another embodiment, and FIG. 7 is a partial sectional view showing a conventional steering lock device. DESCRIPTION OF SYMBOLS 14... Vehicle body frame, 18... Front fork device, 22... Cylinder body, 23... Key rotor, 26... Engine key, 27... Key hole, 30...
...Lock bar, 33... Guard part, 36... Guard part keyway, 38... Constriction part.

Claims (1)

[Claims] A steering lock device for a motorcycle in which a lock bar protrudes from the cylinder body and locks a front fork device by inserting a key into a key hole of a key rotor disposed in the cylinder body and rotating the key. A guard member is fixed above the key rotor, and a guard key groove is formed in this guard member to allow the key to be inserted freely. A steering lock device for a motorcycle, characterized in that it is constructed with high hardness that will not be damaged even when exposed to water.