JPH10119852A - Burglar prevention device for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive burglar prevention device which is hard to be broken or cut off as the current lock and chains are so, furthermore is simple in structure, and is positively burglarproof in the burglar prevention device for a bicycle. SOLUTION: The insertion of a key 20 allows a locking member 17 to be revolved upward so as to allow a projected part 17b to be fitted into the cut-out part 16a of a ring shaped member 16. This constitution thereby allows a rotating shaft 7 to be connected to a crank arm 8 by way of a ring shaped member 16, and the locking member 17. The removal of the key 20 thereby allows the locking member 17 to be revolved downward so as to allow the cut-out part 16a to be released fitting from the projected part 17b, and since the rotating shaft 7 and the crank arm 8 are so constituted as to be freely rotated, its system will never function as a bicycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle anti-theft device and, more particularly, to a technology for preventing theft by depriving the function of the bicycle itself.

[0002]

2. Description of the Related Art Conventionally, various devices for preventing theft of a bicycle have been developed and put into practical use. However, because the bicycle itself is easy to be stolen, theft has not stopped and the frequent theft continues. doing. The most basic ones for preventing theft include those using a combination of a key and a lock, or a strip such as a wire or a chain.

FIG. 7 shows a schematic structure of a conventional bicycle. A front wheel 2 and a rear wheel 3 are rotatably mounted on a front portion and a rear portion of the frame 1, and a handle 4 and a saddle 5 are mounted on an upper portion. A main gear 6 is rotatably attached to a lower portion of the frame 1 via a rotary shaft 7, and crank arms 8 and 9 are connected to both ends of the rotary shaft 7, respectively. Pedals 10, 11 are rotatably attached to the distal ends of the crank arms 8, 9, respectively. The main gear 6 is connected to a rear gear 13 via a chain 12, and the rear gear 13 is connected to the rear wheel 3.

In the combination of a key and a lock for preventing theft, as shown in FIG. 7, a lock 15 is attached to the front portion of the frame 1 so that the front wheel 2 is prevented from rotating by locking the lock. There are cases. In a method using a strip such as a wire or a chain, as shown in FIG. 7, rotation of the rear wheel 3 may be hindered by connecting a rear portion of the frame 1 and the rear wheel 3 with a strip 14. The strip 14 may be hung between the handle 4 and the frame 1 or the front wheel 2 in some cases.

[0005]

However, in the above-mentioned conventional anti-theft device, if the bicycle is to be seriously stolen, the lock must be removed from the frame or destroyed.
Alternatively, there is a problem that a bicycle can be stolen relatively easily by cutting a strip such as a wire or a chain.

In order to further prevent theft by such a method, a plurality of locks or strips are attached to make it harder to steal, or the locks or strips are made stronger, or a more complicated structure is required. For example, to make it difficult to unlock. However, regardless of the method,
There is a problem in that it takes time and effort to remove the key, and the manufacturing cost of these devices such as keys increases.

Therefore, the present invention is to solve the above-mentioned problem, and the problem is that it is difficult to destroy as in the prior art, and it is an inexpensive and simple structure that can reliably prevent theft. An object of the present invention is to provide an anti-theft device.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention provides a bicycle anti-theft device having traveling wheels and a pedal for driving the traveling wheels. A driving force interrupting mechanism for interrupting a driving force transmission path between the traveling wheel and the pedal in response to an operation of the external operating member.

According to this means, when the external operating member is operated, the driving force transmission path between the traveling wheel of the bicycle and the pedal can be interrupted by the driving force interrupting mechanism.
Disconnecting the driving force transmission path can render it unusable as a bicycle, and can be dealt with by simple means such as removing and breaking locks and cutting strips as seen in many conventional theft cases. Since it is not possible, theft can be effectively prevented.

Here, the driving force interrupting mechanism is provided between a crank arm shaft connected to the pedal and a main rotating shaft connected to the traveling wheel, and the driving force transmission path is disconnected. It is preferable that the crank arm shaft be configured to idle with respect to the main rotation shaft in the state.

According to this means, a driving force intermittent mechanism is provided between the crank arm shaft and the main rotation shaft, and the crank arm shaft idles in a state where the driving force transmission path is disconnected. As a result, it cannot be used as a bicycle, preventing theft, and the connection between the crank arm and the main rotating shaft is configured to be intermittent. Cost can also be reduced.

The external operating member is a key. When the key is mounted, the driving force interrupting mechanism connects the driving force transmission path, and when the key is removed, the driving force transmission path is disconnected. Preferably, it is configured.

According to this means, when the key is attached, the driving force transmission path is connected, and when the key is removed, the driving force transmission path is disconnected. Therefore, unless the user has the key, the driving force transmission path can be connected. Because it is not easy, theft can be more reliably prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a bicycle anti-theft device according to the present invention will be described with reference to the accompanying drawings.

(First Embodiment) FIGS. 1, 2 and 5 show the structure of a main part of a first embodiment according to the present invention. Rotary shaft 7 rotatably supported on frame 1
Are connected to rotate together with the main gear 6.
The rotating shaft 7 is connected to crank arms 8 and 9 at both ends. The connecting portion 8a of the crank arm 8 has a hollow structure, and receives one end of the rotating shaft 7. A ring-shaped member 16 is fixed to the end of the rotating shaft 7 by a key, a screw, or the like.
6 is formed with a notch 16a.

On the other hand, inside the hollow portion 8a, a lock member 1 is fixed around a support shaft 17a fixed to the crank arm 8.
7 is rotatably mounted. This lock member 1
In FIG. 7, a projection 17b that fits into a notch 16a formed in the ring-shaped member 16 in the state of FIG. 1 is formed. The other end of the lock member 17 is connected to the crank arm 8.
One end of an elastic member 18 composed of a coil spring fixed to the projection 17b is attached to the projection 17b at a position opposite to the support shaft 17a, and constantly urges the lock member 17 in a direction of rotating downward. ing.

An opening 8b is formed in the lower side surface of the hollow portion 8a, and the key 20 can be inserted into the inside of the hollow portion 8a through the opening 8b. Opening 8b
Slightly behind the opening edge of the opening, a spherical engaging member 19 constantly urged in the protruding direction by an elastic member such as a coil spring.
Are mounted so as to slightly protrude from the wall surface.
The key 20 has a tip portion 20a having an outer edge shape formed in a curved shape, and a concave portion 20b for engaging with the engaging member 19 is formed in an intermediate portion between the tip portion and the grip portion 20c. .

In the state shown in FIG. 1, the key 20 is connected to the opening 8b.
The recess 20b of the key 20 fits into the engaging member 19 to fix the key 20 into the hollow portion 8a. The tip portion 20a of the key 20 pushes the lock member 17 upward against the elastic force of the elastic member 18, and the lock member 17
Of the ring-shaped member 16 is formed by a notch 16a.
Is fitted. For this reason, the crank arm 8 is connected to the rotary shaft 7 by an engagement structure between the lock member 17 and the ring-shaped member 16, and the rotary shaft 7 is moved by pedaling the pedal 10 attached to the tip 8 c of the crank arm 8.
Can be rotated to drive the rear wheel 3 of FIG. 7 via the main gear 6.

On the other hand, the key 20 can be pulled out from the hollow portion 8a by once pushing the grip portion 20c and pushing down the engaging member 19 by the inclined surface formed in the concave portion 20b. In the state where the key 20 is pulled out in this manner, as shown in FIG. 2, the force for pushing up the lock member 17 from below disappears, so the lock member 17 pivots downward by the elastic force of the elastic member 18, and The portion 17a comes off the notch 16a of the ring-shaped member 16. In this state, since the rotating shaft 7 and the crank arm 8 are not connected, the crank arm 8
No matter how much is rotated, the rotating shaft 7 does not rotate, and therefore the main gear 6 does not rotate, so that the bicycle cannot be driven.

In this embodiment, as shown in FIG. 5, the crank arm 8 and the crank arm 9 are mounted such that they are offset from each other by 180 degrees. The crank arm 9 has the same structure as that of the crank arm 8, and the rotary shaft 7 and the crank arm 9 are connected by inserting the key 20 through the opening 9b. Here, the cutout portion 16a of the ring-shaped member 16 and the cutout portion of the ring-shaped portion similarly attached to the rotating shaft 7 in the crank arm 9 are formed at an angle shifted from each other by 180 degrees. As a result, the crank arm 8 and the crank arm 9 are fixed at positions shifted from each other by 180 degrees.

According to this embodiment, when the key 20 is attached, the bicycle can be used as usual by depressing the left and right pedals. However, when the key 20 is removed, the crank arms 8 and 9 are disengaged from the rotating shaft 7. Since the bicycle is disengaged, the bicycle cannot be run due to the pedal, and it is possible to prevent the vehicle from being stolen. This method eliminates the value of being stolen by depriving the bicycle of its basic functions, rather than locking the bicycle. According to this structure, the function of the bicycle cannot be restored by a simple method such as removing the lock, breaking it, or cutting a wire, a chain, or the like as in the related art.

In the above embodiment, the shape of the key 20 that can be inserted into the openings 8b and 9b can be made special by devising the structure inside the hollow portion 8a. Rotating shaft 7 and crank arm 8,
9 cannot be connected. In addition,
In the above embodiment, the mechanism for intermittently driving the driving force is provided in both the left and right crank arms 8 and 9, but the effect can be obtained with only one of them.

In the above-described embodiment, the above-mentioned mechanism (the ring-shaped member 16, the lock member 1,
7, the elastic member 18 and the engaging member 19),
It is possible to make the structure inexpensively without complicating the structure. Also, a key 20 as an external operation member
Since the connection of the driving force transmission path by the driving force intermittent mechanism becomes impossible by removing, the theft can be more reliably prevented.

In the above-described embodiment, when the driving force transmission path is connected, the two crank arms 8 and 9 are necessarily shifted from each other by 180 degrees only by setting the positional relationship of the notch of the ring-shaped member. Since the configuration is such that the positional relationship is adjusted, there is also an advantage that the crank arm can be easily positioned.

Further, in the above embodiment, not only for preventing the bicycle from being stolen, but also for pulling the bicycle, the crank arm from which the key 20 has been removed is tied to a frame or the like, and the legs of the person who pulls the bicycle. It also has the advantage that it can be prevented from contacting the surface. Further, since the crank arm is in a free state, handling in a stopped state becomes easy. For example, even if a large number of bicycles are arranged close enough to contact each other, removal and rearrangement will not be difficult due to the entanglement of the crank arm as in the past, and it is also easy to arrange the abandoned bicycles Become.

(Second Embodiment) Next, a second embodiment according to the present invention will be described with reference to FIGS. 3, 4, and 6. FIG. In this embodiment, the crank arm 28 is intermittently connected to the rotation shaft 27.
A concave hole 27 a is formed at the end of the rotating shaft 27, and the spherical engaging member 31 facing both the inside of the concave hole 27 a and the outside of the rotating shaft 27 slightly extends in the radial direction of the rotating shaft 27. It is housed so that it can be moved to. When the engaging member 31 moves outward, the surface of the engaging member 31 protrudes slightly outward from the rotation shaft 27. When the engaging member 31 moves inward, the surface of the engaging member 31 slightly extends inside the concave hole 27a. It is designed to protrude.

On the other hand, a ring-shaped member 32 having a cylindrical shape is attached and fixed to the crank arm 28. The ring-shaped member 32 rotatably supports the rotation shaft 27, and has a concave surface formed on the inner peripheral surface that contacts the rotation shaft 27 so as to fit with the protruding surface of the engagement member 31. 32
a is formed.

As shown in FIG. 3, when nothing is inserted into the concave hole 27a, when the crank arm 28 is rotated, the engaging member 31 is pushed back inward and the rotating shaft 27 is rotated.
, The driving force from the crank arm 28 is not transmitted to the rotating shaft 27. Here, the key 40 shown in FIG.
1 is pushed out from the inside to the outside, and fits into the concave portion 32 a of the ring-shaped member 32. In this case, the crank arm 28 and the rotating shaft 27 are connected and the driving force is transmitted, so that the bicycle can be used in the same manner as a normal bicycle.

Here, the key 40 has a cylindrical tip-side body 40 extending rearward from a curved tip 40a.
b, and an annular groove 40c is formed at the rear of the tip side body portion 40b. The rear side of the annular groove 40c has a slightly larger diameter and is connected to a cylindrical rear end body 40d having a slightly larger diameter than the front end body 40b. A grip portion 40e having a further enlarged diameter is formed behind the rear end side body portion 40d.

When the key 40 is introduced into the concave hole 27a, FIG.
As shown in FIG. 7, the distal end portion 40a advances along the central axis of the concave hole 27a, and the annular groove 40c penetrates until the annular groove 40c engages with the engaging member 31 while pushing the engaging member 31 outward by the distal side trunk portion 40b. . When the annular groove 40c engages with the engaging member 31, as shown in FIGS. 4 and 6, the engaging member 31 is held in a state of being slightly pushed outward, and as described above, the crank arm 28 and the rotating shaft 27 are rotated. Are linked. At this time, the key 40 is held in the concave hole 27a by the engagement between the engagement member 31 and the annular groove 40c.

In order to remove the key 40, the key 40 is pushed in once, and the key 40 is pulled out with the engaging member 31 pushed further outward on the inclined surface on the side of the rear end side body 40d of the annular groove 40c. To do. In a state where the key 40 is removed, it is desirable to attach a cap member 50 made of a synthetic resin or the like shown in FIG. 6 so that dust does not become clogged in the concave hole 27a or a foreign object is inserted by a thief.

In each of the above-described embodiments, the configuration is such that the key is in a usable state when the key is attached, and the key is in an unusable state when the key is removed.
It is not always necessary to adopt such a mode, and even if a key is used, not only the key may be inserted, but also the driving force interrupting mechanism may be configured to operate by rotating after insertion. Can be adopted. Further, the driving force interrupting mechanism may be operated by a switch or a dial provided on the bicycle instead of the key. In this case, the danger of theft is further reduced by configuring such that the driving force can be interrupted for the first time by inputting a personal identification number or by enabling the driving force to be interrupted by operating a remote controller or the like. it can.

Further, in each of the above embodiments, the driving force intermittent mechanism is provided between the crank arm and the rotating shaft. However, any other driving force transmission path from the pedal to the traveling wheel may be used. A driving force interrupting mechanism may be provided at a location. For example, a clutch mechanism may be provided between the rotation shaft and the main gear or between the rear gear and the rear wheel.

[0034]

As described above, according to the present invention, when the external operating member is operated, the driving force transmission path between the traveling wheel of the bicycle and the pedal can be interrupted by the driving force interrupting mechanism. Disconnecting the driving force transmission path can render it unusable as a bicycle, and can be dealt with by simple means such as removing and breaking locks and cutting strips as seen in many conventional theft cases. Since it is not possible, theft can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing a use state of a first embodiment according to the present invention.

FIG. 2 is a partial side sectional view showing a non-use state of the first embodiment.

FIG. 3 is a partial side sectional view showing a non-use state of a second embodiment according to the present invention.

FIG. 4 is a partial side sectional view showing a use state of the second embodiment.

FIG. 5 is a partial rear cross-sectional view illustrating a use state of the first embodiment.

FIG. 6 is a partial rear cross-sectional view illustrating a use state of the second embodiment.

FIG. 7 is a schematic configuration diagram showing the entire configuration of a conventional bicycle.

[Explanation of symbols]

 7, 27 Rotary shaft 8, 9, 28 Crank arm 10, 11 Pedal 16, 32 Ring-shaped member 16a Notch 17 Lock member 17a Projection 20, 40 Key 31 Engagement member 32a Concave surface

Claims (3)

[Claims] An anti-theft device for a bicycle, comprising: a traveling wheel; and a pedal for driving the traveling wheel, wherein an external operation member, and the traveling wheel and the pedal are connected to each other in response to an operation of the external operation member. And a driving force intermittent mechanism for intermittently intermitting a driving force transmission path between the bicycles. 2. The driving force intermittent mechanism according to claim 1, wherein the driving force intermittent mechanism is provided between a crank arm shaft connected to the pedal and a main rotation shaft connected to the traveling wheel. A bicycle anti-theft device, wherein the crank arm shaft is configured to idle with respect to the main rotation shaft in a disconnected state. 3. The external operating member according to claim 1, wherein the external operating member is a key, the driving force intermittent mechanism connects the driving force transmission path when the key is attached, and the driving force when the key is removed. A bicycle anti-theft device characterized in that the force transmission path is cut off.