JPH09240533A - Antitheft device for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively improve prevention of theft of a bicycle. SOLUTION: A fixed frame 14 is fixed to a pipe frame 12 for supporting a saddle 10, a turning frame 16 is supported on the fixed frame 14, a locking member 20 for detachably locking the turning frame 16 and the fixed frame 14 is provided on the front end of the fixed frame 14, and an engaging arm 22 to be engaged with a cylinder lock 24 attached to the fixed frame 14 in the position in which the turning frame 16 is erected is provided on the rear end side of the turning frame 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antitheft mechanism for preventing a bicycle from being stolen.

[0002]

2. Description of the Related Art Conventionally, a bicycle anti-theft device has a lock mechanism for locking the rotation of a bicycle wheel, a fixing article for connecting a bicycle to a fixed column of a building or the like to prevent the bicycle from moving. There is. As the lock mechanism, there are provided a lock device fixed to a bicycle in advance and attached thereto, a lock article formed in a chain shape or the like and appropriately attached to the bicycle for use. In both cases, a key is used to set and release the lock.

[0003]

By the way, the above-mentioned conventional bicycle antitheft device is not always effective in preventing the bicycle theft. The reason is that the lock device that is fixed to the bicycle is fixed and attached to the front hawk or frame of the bicycle, but even if the key of the lock device cannot be released, it can be unlocked by moving the lock device. It is possible, and also in the case of lock products formed in a chain shape, cut the chain,
This is because the lock can be released by destroying the lock item.

The present inventor has made the present invention in view of the fact that the conventional bicycle anti-theft device is not always effective for the anti-theft. The purpose of the present invention is to prevent the anti-theft of the bicycle. The present invention intends to provide a bicycle antitheft mechanism that can be effectively used as a bicycle and is easy to handle.

[0005]

The present invention has the following constitution in order to achieve the above object. That is, the frame body supporting the saddle of the bicycle supports the saddle so that it can be erected up and down between the normal running state and the standing state, and the saddle can be locked at the position where the saddle stands up. To do. Further, a fixed frame is fixed to a pipe frame that supports the saddle, a rotating frame is pivotally supported at a rear end portion of the fixed frame, and the rotating frame and the fixed frame can be attached to and detached from a front end portion of the fixed frame. A locking member for locking is provided, and locking means is provided for engaging the rotating frame in a standing state at the rear end side position of the fixed frame and locking the rotating frame at the standing position. To do.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is an explanatory view showing an embodiment of a bicycle antitheft mechanism according to the present invention. The anti-theft mechanism for a bicycle according to the present invention moves up and down between a position where the saddle of the bicycle is set to be substantially horizontal, which is used during normal traveling, and a position where the saddle is set to be substantially vertical when parked. The feature is that it is possible. That is, when the vehicle is parked, the saddle is locked and fixed at the standing position to prevent theft, and during normal use, the saddle can be returned to the normal position for use.

In order to allow the saddle to be tilted up and down, in the embodiment shown in FIG. 1, a frame fixed substantially horizontally above the pipe frame 12 attached to the frame body of the bicycle for adjusting the height of the saddle 10. 14 is fixed, and the rotating frame 1 is placed so as to be superposed on the fixed frame 14.
6, the rotary frame 16 is rotatably supported by a shaft 18 fixed to the rear end side of the fixed frame 14, and the saddle 10 is fixedly supported on the rotary frame 16. 30
Are springs for supporting the saddle 10, and 32 and 34 are fixing plates for fixing the spring 30 to the rotating frame 16.

As shown in FIG. 1, the rotating frame 16 has its front end portion extended to the front end position of the fixed frame 14, and is bent downward at the front end in accordance with the front end position of the fixed frame 14. Reference numeral 16a denotes an engaging arm portion that engages with the fixed frame 14 at the portion bent into the L shape. When the bicycle is normally run, the rotating frame 16 needs to be fixed and set on the fixed frame 14. In the present embodiment, a locking member 20 is provided on the lower surface of the front end portion of the fixed frame 14 as locking means for locking and fixing the rotating arm 16 and the fixed frame 14, and a locking member mounted on the locking member 20. The pawl 20a is the engaging arm portion 1 of the rotating frame 16.
6a is adopted.

The locking claw 20a is always biased and mounted in a direction projecting forward from the front end of the fixed frame 14, and the locking claw 2
As shown in FIG. 1, the front end surface of 0a is formed as a tapered surface having a lower end side. Further, the engaging hole 16b into which the engaging claw 20a is fitted is provided in the engaging arm portion 16a of the rotating frame 16.
To form By forming the front end surface of the locking claw 20a into a tapered surface, when the rotating frame 16 is tilted from the standing position to the horizontal position, the lower surface of the engaging arm portion 16a provided at the front end of the rotating frame 16 has the locking claw 20a. When the rotating frame 16 descends to a predetermined position while pushing the locking claw 20a in the retracted direction while contacting the tapered surface of the locking claw 20a, the locking claw 20a is fitted into the locking hole 16b at the lowered position and is rotated. The moving frame 16 is clickably locked to the fixed frame 14.

Since the locking claw 20a is biased in the protruding direction, when the rotating frame 16 is lowered to a predetermined position, the locking claw 20a is automatically fitted into the locking hole by the biasing force. With the locking claw 20a fitted, the locking claw 20a
Is in a retaining state, and the rotating frame 16 is locked and supported by the fixed frame 14. In this way, the rotating frame 16 or the saddle 10 is held in the normal traveling position. When the rotating frame 16 is raised from the normal position, the knob 20b provided for retracting the locking claw 20a may be pulled to release the engagement of the locking claw 20a.

FIG. 2 shows a plan view of the rotating frame 16 and a plan view of the shaft 18, the locking member 20, etc. for pivotally supporting the rotating frame 16 on the fixed frame 14. The shaft 18 is installed so as to penetrate the fixed frame 14 in the width direction. The rotating frame 16 is pivotally supported on its lower surface at a substantially central portion of a shaft 18. FIG.
An assembled perspective view of the fixed frame 14 and the rotating frame 16 is shown in FIG. The rotating frame 16 is rotatably mounted on the fixed frame 14 via a shaft 18. Saddle 10
For mounting, the spring 30 of the saddle 10 is fixed by sandwiching it between two fixing plates 32 having spring mounting grooves 30a, and the fixing plates 32 and 34 are fixed to the rotating frame 16 by screwing.

On the other hand, regarding the structure in which the rotating frame 16 is erected and is locked and supported in the erected state, the engaging arm 22 is extended downward from the lower surface of the rear end of the rotating frame 16, and the fixed frame 14 is fixed. By installing a cylinder lock 24 as an engaging means for engaging with the engaging arm 22. The cylinder lock 24 is configured such that the push rod 24b is pushed in to cause the engaging rod 24a to project from the inner end surface of the cylinder lock 24 and unlocked by a key operation. The engaging arm 22 of the rotating frame 16 is provided with an engaging hole 22a into which the rod 24a is fitted, and the rod 2 of the cylinder lock 24 is inserted into the engaging hole 22a when the rotating frame 16 is in the standing position.
4a is fitted and the rotating frame 16 is held at the standing position.

As shown in FIG. 2, the cylinder lock 24 has a push portion 24b near one side surface of the fixed frame 14.
Installed at a position where can be easily operated. The rod 24a of the cylinder lock 24 is arranged so as to project toward the other side surface of the fixed frame 14 when locked. The engaging arm 22 provided on the rotating frame 16 is the rod 2 of the cylinder lock 24.
The protrusion 4a is arranged at a position where it can be engaged with the engagement hole 22a.

Since the engaging arm 22 rotates about the shaft 18 together with the rotating frame 16, it must be disposed at a position where it does not interfere with the cylinder lock 24 during the rotating operation.
In this embodiment, the main body of the cylinder lock 24 is the rotating frame 1.
Since it occupies the substantially central portion of 6, the engaging arm 22 is arranged at a position deviated from the center line of the rotating frame 16 to the other side surface side so as not to interfere with the main body of the cylinder lock 24. .

A cylinder lock 24 is provided in an engaging hole 22 formed in the engaging arm 22 at a position where the rotating frame 16 is erected.
In order to allow the rod 24a to be fitted therein, the distance between the shaft 18 and the engagement hole 22 is made equal to the distance between the shaft 18 and the rod 24a. Further, in order to hold the rotating frame 16 in an upright position, the position of the engaging arm 22 in a state where the rotating frame 16 is fixedly set to the fixed frame 14 and the state in which the rotating frame 16 is in an upright position. The position of the engaging arm 22 and the position of the engaging arm 22 are deviated from each other by 90 degrees with respect to the shaft 18.

With such a structure, the rotating frame 16
By inserting the rod 24a of the cylinder lock 24 into the engaging hole 22a of the engaging arm 22 of the rotating frame 16 in the state of standing upright, the rotating frame 16 can be held and locked in the standing position. . 4 and 5 respectively show a state in which the rotating frame 16 is in the position for normal traveling and a state in which the rotating frame 16 is in the standing position, as sectional views taken along the line AA in FIG. In FIG. 4, reference numeral 26 is a support block for fixing the cylinder lock 24 to the fixed frame 14. The cylinder lock 24 is fitted into and supported by a support block 26, and a rod 24 a can project from the other end side of the support block 26. 14a, 1
6a is a rib provided on the periphery of the fixed frame 14 and the rotating frame. Thus, the ribs 14a and 16a can be provided to reinforce the fixed frame 14 and the rotating frame 16.

As shown in the drawing, the engaging arm 22 is a member formed in a U shape when viewed from the front, and the engaging hole 22a into which the rod 24a of the cylinder lock 24 is fitted in the arm on the inner side surface side.
Is provided. The engagement arm 22 is located on the side of the support block 26 so that the engagement arm 22, the cylinder lock 24, and the support block 26 do not interfere with each other when the rotation arm 16 is rotated.

In the state shown in FIG. 5 in which the rotary arm 16 is erected, the cylinder lock 2 is attached to the engaging arm 22 of the rotary frame 16.
4 shows a state in which the rod 24a of No. 4 is fitted and locked.
The rotation arm 16 is locked by pushing the push portion 24b of the cylinder lock 24, protruding the rod 24a, and inserting the rod 24a into the engagement hole 22a of the engagement arm 22. Thus, unless the cylinder lock 24 is released by the key, the rotating frame 16 or the saddle 10 is locked and held in the upright state.

FIG. 5 shows a state in which the saddle 10 is erected and locked by the above structure. As described above, the bicycle of the present embodiment is configured so that the saddle 10 can be rotated between the standing position and the normal traveling position, and the saddle 10 can be locked and fixed at the standing position. Therefore, during parking, the saddle 10 is erected and supported so that normal running of the bicycle can be disabled and theft can be prevented.

The antitheft mechanism of the present embodiment allows the saddle 10 itself to be tilted up and down, and locks the saddle 10 in the standing position to disable traveling, so the saddle 10 can be operated by a method other than releasing the key. Cannot be returned to the normal position. Otherwise, the supporting portion of the saddle 10 is destroyed and normal traveling becomes impossible, and theft prevention can be extremely effectively achieved.

Further, the bicycle antitheft mechanism of the present embodiment has an advantage that the operation of tilting the saddle 10 up and down and locking it is easy. That is, when locking the saddle 10 in the upright state, the locking claw 20a of the locking member 20 may be removed from the rotating frame 16 to raise the saddle 10, and the cylinder lock 24 may be pushed in to lock the engagement arm 22. When the saddle 10 is returned to the normal position, the cylinder lock 24 is released and the saddle 10 is simply pushed down, so that the locking claw 20a is engaged and locked with the rotating frame 16.

Of course, it is also possible to use the method of raising and lowering the saddle according to the present invention, the method of locking the wheels of the front wheels, and the other anti-theft goods together. 7 and 8 show an example of a front wheel lock mechanism used in combination with the above-described method of raising and lowering the saddle. This lock mechanism locks using a cylinder lock 25 that can be unlocked by the same key as the cylinder lock 24 used in the above lock mechanism.
In this lock mechanism, a lock plate 44 is fixed to the front wheel frame 42 at a connecting portion between the front wheel handle shaft 40 and the front wheel frame 42, and a rod 25a of the cylinder lock 25 is inserted into a key hole 46 formed through the lock plate 44. It is possible to insert.

The cylinder lock 25 is fixed to the bearing frame 41 of the handle shaft 40, and the cylinder lock 25 and the lock plate 44 can be engaged at a position where the front wheel frame 42 is rotated. A plurality of key holes 46 provided in the lock plate 44 are provided so that the front wheel frame 42 can be locked at a position rotated by a predetermined angle. When locking the front wheel, the front wheel is bent at a predetermined angle, the push portion 25b of the cylinder lock 25 is pushed, and the rod 25a is fitted into the key hole 46 to lock the front wheel. When the lock is released, it may be released by using the key used in the lock mechanism by raising and lowering the saddle. This front wheel locking mechanism is useful because it can be used to easily lock the front wheels as well, by using it together with the above-described locking mechanism for raising and lowering the saddle.

The above-described embodiment of the antitheft mechanism for a bicycle can be applied to an actual bicycle by appropriately changing the shape and the like. For example, although the cylinder lock 24 is used as the lock mechanism of the rotating frame 16 in the above embodiment, other locking means may be used instead of the cylinder lock 24. Further, even when the saddle 10 is erected, it does not necessarily have to be erected in the direction of 90 degrees with respect to the normal traveling position, and it is sufficient that the saddle 10 is configured to be erected at an angle at which normal traveling cannot be performed and locked.

[0025]

The bicycle antitheft mechanism according to the present invention comprises:
By allowing the saddle to be tilted between the normal running position and the standing position and locking it in the standing position, it is impossible to run the bicycle in the locked state, compared with the case of the conventional locking device, It has the effect of preventing theft of the bicycle more effectively. Further, by simplifying the structure for moving the saddle up and down and making it easy to handle, it is possible to provide a remarkable effect such as providing an antitheft mechanism that facilitates the locking operation and can be used easily.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a main part of a bicycle antitheft mechanism.

FIG. 2 is an explanatory diagram showing a planar arrangement of a rotating frame, a shaft, a cylinder lock, a locking member, and the like.

FIG. 3 is an assembled perspective view showing a method of attaching a fixed frame, a rotating frame, and the like.

FIG. 4 is a cross-sectional view showing an arrangement of a fixed frame, a rotating frame, and the like in a normal traveling state.

FIG. 5 is a cross-sectional view showing a locked state of the engagement frame and the cylinder lock in a state where the rotating frame is erected.

FIG. 6 is a side view of the bicycle with the saddle upright.

FIG. 7 is an explanatory diagram showing a front wheel lock mechanism.

FIG. 8 is a plan view showing an arrangement of a lock plate and a cylinder lock in a front wheel lock mechanism.

[Explanation of symbols]

 10 Saddle 12 Pipe Frame 14 Fixed Frame 16 Rotating Frame 16a Engaging Piece 16b Engaging Hole 18 Shaft 20 Engaging Member 20a Engaging Claw 20b Knob 22 Engaging Arm 22a Engaging Hole 24 Cylinder Lock 24a Rod 24b Pushing Section 25 Cylinder Lock 30 Spring 32, 34 Fixing plate 44 Lock plate 46 Key hole

Claims (2)

[Claims] 1. A frame body supporting a saddle of a bicycle, the saddle being supported so as to be able to move up and down between a normal running state and a standing state, and the saddle can be locked at a position where the saddle stands up. Anti-theft mechanism for bicycles characterized by. 2. A fixed frame is fixed to a pipe frame which supports a saddle, a rotating frame is pivotally supported at a rear end portion of the fixed frame, and the rotating frame and the fixed frame are provided at a front end portion of the fixed frame. A locking member that locks in a detachable manner is provided, and a locking means that locks the rotating frame at the standing position by engaging the rotating frame at the rear end side position of the fixed frame in a standing state The antitheft mechanism for a bicycle according to claim 1, wherein: