JPH0976960A - Lock for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent at least a working member of a lock (a part equivalent to a stopper to stop the movement of a mechanical member) from being exposed outside of a bicycle, to make it difficult for a theft to discover the presence of the lock, to make the lock difficult to be broken, and to prevent a part of a bicycle from being broken even when a bicycle is forcibly moved. SOLUTION: In a lock 11 for a bicycle in which a pair of cranks to which a pedal is fitted respectively are connected to each other by a shaft 5, and the shaft 5 is pivotably and rotatably supported in a shaft case 1, at least one engagement part 51 is formed on the outer circumference of the shaft 5, and the lock 11 capable of stopping the rotation of the shaft 5 is fitted to the shaft case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle lock for preventing a bicycle from being stolen, and more specifically, it is possible to prevent a bicycle from being stolen by restricting a pedal from rotating so that the bicycle cannot be driven. It relates to bicycle locks.

[0002]

BACKGROUND OF THE INVENTION In order to prevent theft of bicycles, conventionally used locks are attached to a part of the side frame of the front or rear wheels. This lock employs a stopper that is configured to project or retract, and the rotation of the wheel is stopped by inserting the stopper between the spokes of the wheel.

However, since such a lock is exposed to the outside of the bicycle, the rotation of the pedal can be easily performed by forcibly removing the lock itself from the frame or deforming the entire lock or only the stopper. With the ability to recover, even a child who was not familiar with machines could easily borrow or steal a bicycle.

When a violent thief is encountered and the bicycle is forcibly moved with the lock in operation, even if the lock is prevented from being destroyed and theft can be prevented, the spokes on the wheels can be prevented by the lock stopper. It would have been damaged and the bicycle would have to be repaired.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent at least a lock actuating member (a portion corresponding to a stopper for stopping the movement of a mechanical member) of a lock from being exposed to the outside of a bicycle by a thief. (EN) Provided is a lock that makes it difficult to discover its existence and easily destroys it, and does not damage a part of a bicycle when it is forcibly moved.

[0006]

According to the present invention, which has achieved the above object, a pair of cranks each having a pedal attached thereto are connected by a shaft, and the shaft is rotatably supported in a cylindrical shaft case. A lock for a bicycle, wherein at least one engaging portion is formed on the outer periphery of the shaft, and the lock can stop rotation of the shaft by engaging with the engaging portion. It is characterized by being attached to the case.

As long as one or more engaging portions formed on the shaft are provided in the outer peripheral direction of the shaft, a plurality of engaging portions such as two, three, etc. are arranged along the outer peripheral direction. The engaging portion may be formed by cutting out in a groove shape in an arbitrary shape (including one in which a planar engaging portion is formed by cutting a part of a shaft having a circular cross section). ), Or two or more protrusions are provided in a protruding manner, and a recess is provided as an engaging portion between them.

Further, the structure of the projection portion which is constituted as an actuating member in the lock is such that it can move forward and backward toward the engaging portion, or it can be displaced so as to turn (preferably 90 to 270 degrees). Any of those which are displaced within the range, and more preferably those which are displaced by 180 degrees) may be used.

In the most preferable embodiment, an engaging portion is formed by cutting out a part of the outer periphery of a shaft having a circular cross-sectional shape to have an L-shaped cross section, and a protruding portion that can be inserted into or retracted from the engaging portion. Is preferably formed in a lock, and the protrusion has a structure in which the position is changed so as to rotate by the rotation of a key suitable for the lock.

The lock of the present invention restricts the free rotation of the shaft connecting the left and right cranks of the bicycle, and prevents the bicycle from being driven without the need to step on the pedal. It is fixed to the shaft case which is rotatably supported by means such as welding.

Further, the structure for stopping the shaft is
This is done by engaging a groove-shaped or protrusion-shaped engaging portion formed on the shaft with a protrusion that is a part of the lock and that changes the position, and by fixing the lock to the shaft case, The shaft case and the shaft can be arbitrarily selected between the locked state and the unlocked state (using a lock that can be operated only by a compatible key).

That is, in the lock fixed to the shaft case, a fitting key is fitted and moved to stop the rotation of the shaft by the lock when the protrusion is engaged with the engaging portion of the shaft. By moving the key back, the protrusion of the lock is retracted from the shaft rotation locus, the shaft can be freely rotated, and the pedal can be rotated to allow the bicycle to travel. .

In a general bicycle, the shaft is solid and has a circular cross section, and a simple means for processing the shaft to form an engaging portion is a cross section L centering on a part of the outer circumference. It can be achieved by cutting into a V-shape, a V-shape, or a semi-cylindrical shape. At this time, the smaller the number of the engaging portions formed, the easier the processing is, and if one engaging portion is formed, the engagement with the protruding portion of the lock is possible.

The structure of the lock is such that when a suitable key is inserted and the lock is operated, the protrusion, which is a part of the lock, moves so as to rotate 180 degrees, and engages with the engaging portion formed on the shaft. The structure of the lock itself has a simple structure and can be provided at a low cost without an excessive size. At this time, reversing the turning movement amount of the protrusion by 180 degrees is efficient because the largest stroke can be secured.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially perspective explanatory view showing the vicinity of a shaft case 1 accommodating a shaft 5 (see FIGS. 2 and 3) connecting a pair of cranks 2 and 2. The shaft case 1 is a tubular metal pipe material. The rod-shaped cranks 2, 2 formed on the shaft case 1 are rotatably attached to the shaft case 1 at both ends thereof (the shaft 5 is rotatably supported on the shaft case 1 as will be described later). It will be done). Other frame members 4 and 4 are welded and joined to the outside of the shaft case 1, and a columnar lock 11 is attached through the shaft case 1, and a part of the outer periphery of the lock 11 is welded to the shaft case 1. To be joined.

FIG. 2 is a cross-sectional explanatory view of the shaft case 1,
FIG. 3 is a vertical cross-sectional explanatory view of the shaft case 1. As shown in FIG. 3, spline processing parts 52, 52 are formed at the left and right ends of the shaft 5 for fixedly joining the crank 2, and the left and right parts of the shaft 5 are ball bearings 54,
The shaft 5 is attached to the shaft case 1 via 54, and the shaft 5 is rotatably supported by the shaft case 1.

Further, as shown in FIG. 2, an engaging portion 51 which is cut out in an L-shaped cross section is formed on a part of the outer periphery of the shaft 5. The engagement portion 51 is formed only in a part of the center of the shaft 5 in the longitudinal direction. Further, in the approximate center of the shaft case 1 in the length direction (it may be the end side in the length direction),
As described above, the lock 11 (in FIG. 2, the state in which the key 12 is inserted) is welded and joined, and the key 1 is partially attached to the lock 11.
A protrusion 13 that is displaced by the operation of 2 is provided inside the shaft case 1.

That is, in this embodiment, when the key 12 is rotated by 180 degrees, the protrusion 13 is moved so as to rotate 180 degrees and is displaced to the position 13a. Therefore, when the protrusion 13 engages with the inside of the engaging portion 51 of the shaft 5 as shown by the solid line in FIG. 2, the rotation of the shaft 5 is restricted by this and stopped so as not to rotate at all. At this time, the cranks 2 and 2 cannot be moved at all, the pedals 3 attached to the tips of the cranks 2 and 2 cannot be rotated, and the bicycle cannot be driven. Theft will be prevented.

Conversely, when the key 12 is rotated to move the protrusion 13 to the position 13a shown by the broken line in FIG. 2 by 180 degrees,
The projection 13 and the shaft 5 are not in contact with each other (which is naturally disengaged from the inside of the engaging portion 51), and the shaft 5 freely rotates with respect to the shaft case 1 to rotate the pedal to drive the bicycle. be able to.

The operation structure of the engaging portion 51 and the lock 11 is not limited to this example, and may be the structure shown in FIGS. 4 (a) to 4 (d). Ie lock 1
As shown in FIGS. 1 (a) and (b), 1 has a protrusion 13 of 9
In addition to the structure in which it is displaced so as to turn at an arbitrary angle within the range of 0 to 270 degrees and moves to the position indicated by 13a, its protrusion 14 as indicated by arrows in (c) and (d)
May have a structure of linearly advancing and retreating in a direction approaching or separating from the shaft 5.

The engaging portion 51 formed on the shaft 5 is
As shown in (a), a notch is formed so as to have a V-shaped cross section, and as shown in (b), a plurality of notches are provided along the circumferential direction of the shaft 5. Of the engaging portions (four in this example) are formed (thereby increasing the chances of engaging with the protrusions and facilitating the engagement), as shown in FIG. The plurality of projections 55, 55 described above are joined at intervals, and a concave engaging portion 56 into which the projection 14 can enter is formed between the projections 55, 55, as shown in FIG. A part of the outer circumference of the lock is cut into a flat surface (in this example, six chamfers are formed, but at least one or more chamfers are sufficient), and the end surface of the protrusion 14 of the lock 11 is brought into contact with the shaft 5 May be arbitrarily selected from those that regulate the rotation of the.

The number and shape of the engaging portions 51, the shape and number of the protrusions 55, and the number of chamfers are not limited to those shown in FIG. Any number and shape can be selected. Also, the protrusion 1 of the lock 11
The combination of the actuating mechanisms 3 and 14 and the engaging portion 51 of the shaft 5 is not limited to the examples (a) to (d), and any combination can be adopted.

[0023]

Since the present invention is constructed as described above, the rotation of the pedal can be stopped and regulated by using the lock that is not exposed to the outside according to claim 1, the bicycle cannot be driven, and the bicycle is stolen. Can be prevented. Further, when used in combination with a conventional bicycle lock, the bicycle drive is regulated at different parts, so that it is possible to further exert the effect of preventing theft.

Even if the pedal is forcibly moved in the locked state, some parts of the bicycle are not easily damaged, and the rotation of the pedal is ensured unless the key is unlocked. Can be regulated.

On the other hand, according to the structure of claim 2, the lock has a simple structure, an inexpensive and small one can be used, and the engaging portion to be applied to the shaft can be easily machined, so that the lock is economical. Can now be attached to a bicycle.

[Brief description of drawings]

FIG. 1 is a partial perspective explanatory view showing an arrangement position of a lock in the present invention.

FIG. 2 is a cross-sectional explanatory view of the shaft case shown in FIG.

3 is a vertical cross-sectional explanatory view of the shaft case shown in FIG.

4A to 4D are cross-sectional explanatory views showing another structure of an engagement portion and a lock provided on a shaft.

[Explanation of symbols]

 1 Shaft Case 2 Crank 3 Pedal 4 Frame Material 5 Shaft 11 Lock 12 Keys 13, 14 Projection 51 Engagement 52 Spline Processing 54 Ball Bearing

Claims (2)

[Claims] 1. A bicycle lock in which a pair of cranks each having a pedal attached thereto are connected by a shaft, and the shaft is rotatably supported in a cylindrical shaft case, the outer periphery of the shaft. At least one engaging portion is formed on the shaft case, and a lock capable of stopping rotation of the shaft by engaging with the engaging portion is attached to the shaft case. Tablets. 2. An engaging portion is formed by cutting out a part of the outer periphery of a shaft having a circular cross-sectional shape into an L-shaped cross section, and a protruding portion that can be inserted into or retracted from the engaging portion is a lock. The lock for a bicycle according to claim 1, wherein the protrusion is formed on the bicycle, and the protrusion is configured to convert an entry position and a retracted position by rotation of a key fitted to the lock.