JP4827954B2 - Bicycle overturn prevention device - Google Patents

Description

The present invention relates to a bicycle that is placed with a rear stand on a flat parking surface such as a road surface, a ground surface, a floor surface, etc. Directly move the front wheels in a straight direction so that they do not fall over due to turning left or right like when turning the rudder, or the parking position changes due to unstable posture and does not hinder traffic and means for fixedly holding the can be placed easily portable any place, after use removal easy as possible carried relates bicycles fall prevention device compact and lightweight.

  Bicycles are generally parked while standing on a stand. Two types of stand, a stand-alone stand and a single stand, are in widespread use. In the case of a compatible stand, the stand is supported at a total of three points, two on the left and right on the stand and one on the front wheel grounding portion. In the case of a single stand, it is supported at a total of three points: one point on one stand, one point on the rear wheel grounding portion, and one point on the front wheel grounding portion.

  In any stand system, the bicycle is held in a supported state by supporting three points. Under this parked state, the steering wheel is rotatable in the steering direction, and the parking surface, the front wheel grounding portion, The handle position is only held constant by the frictional force. For this reason, the handle can easily turn to the rudder state when a person or an object comes into contact with the handle, and this causes the bicycle to become unstable and take a width that is the width of the front wheel, impeding traffic. Cause a fall.

Therefore, there is a demand for means for holding the front wheels in a straight-ahead direction that is a stable posture with a balanced left and right when the bicycle is parked, and various means have been proposed. Here are some examples:
(A) A bicycle alignment tool in which a main body made of a synthetic resin material or other material is provided with a concave groove for fitting and holding the front wheel grounding portion of the bicycle, and a non-slip member is provided on the bottom surface of the main body (for example, Patent Document 1). reference).
(B) a block body provided with a tire fitting groove for standing and parking a part of a bicycle tire, a slope surface for riding on the tire provided on a side surface of the block body, and a locking ring or Bicycle parking lot provided with anchoring holes (for example, see Patent Document 2).
(C) Stability based on its own weight of a concrete block that is elongated on the base plate 3 in a semi-cylindrical shape with a parking groove 2 that immerses and holds the lower portion T of the wheel W at the top 4 and penetrates the bottom 7. A bicycle stand that is formed so that it can be parked by leaning the wheel W (see, for example, Patent Document 3).

However, each of these means has practical inconveniences in the following points.
The means (a) has the shape shown in FIGS. 10 and 11, and the concave groove 102 formed in the main body 100 is an open groove shape in which the end portion in the front-rear direction of the bicycle is opened and the bottom surface is horizontal and flat. Presents. Since there is no stopper means for stopping the progress of the front wheel when the front wheel of the bicycle is put in the concave groove 102, it is not easy for the operator to stop and position appropriately. Since the main body 100 is not so long, if it is stopped near the end, the holding may be uncertain. Further, for example, in the configuration in which a plurality of protruding anti-slip members 103 are arranged at the bottom as in this example, the bicycle is stopped so that the front wheel ground contact point is located at a substantially central position connecting the anti-slip members. Seems good.

  The means (b) has the outer shape shown in FIG. 12, and the tire fitting groove 104 has a concave shape curved downward along the outer shape of the front wheel formed on the upper surface of the block body 105. As long as the tire is guided into the fitting groove 104, it is automatically fitted into the fitting groove by its own weight as shown in FIG. 13, and the position of the front wheel in the front-rear direction with respect to the block body 105 is determined. In this example, since the slope surface 106 for guiding the tire into the fitting groove 104 is a flat inclined surface without any guide means, the slope surface 106 is positioned so carefully before the front wheel is put on the slope surface 106. Otherwise, it is not easy to guide the front wheel to the fitting groove 104 as shown in FIG.

The means (c) has the outer shape shown in FIGS. 14 and 15, and the parking groove 107 has an inclined surface facing in the longitudinal direction because of the function of immersing and holding the lower part of the wheel. As long as the front wheel is guided to the entrance of the inclined surface, it is considered that it is automatically fitted into the parking groove 107 along the inclination by its own weight and positioned in that state. Here, the transfer groove 108 for guiding the wheel to the parking groove 107 is a horizontally formed groove, and the entrance of the transfer groove 108 is in the middle of the inclined surface 109 formed at one end portion of the main body made of a concrete block. It is the structure which has opened.
As described above, since the entrance of the transfer groove 108 is opened in the middle of the inclined surface 109, a height (step) from the parking surface to the transfer groove 108 is generated, and the resistance when riding on the front wheel is large. The “depth of the parking groove (step)” that fulfills the function of determining the front-rear direction position of the front wheel in the parking groove 107 is determined by the difference ΔH in height between the bottom of the parking groove 107 and the bottom of the transfer groove 108. In order to secure this “depth of the parking groove” to some extent, the height of the groove bottom of the transfer groove 108 must be increased. It becomes large and it is not easy to guide the front wheel to the transfer groove 108. If the height of the transfer groove 108 is lowered, the level difference becomes shallow and the wheel positioning function in the front-rear direction cannot be sufficiently achieved.

  The means of (b) and (c) above is a state in which the block body is made of a material having a weight of, for example, 50 kg, such as concrete, and the bicycle is raised only by holding the front wheel without standing the rear portion of the bicycle with a stand. However, since it is heavy, it cannot be easily carried and installed and removed. Such a stationary means has a high front wheel holding performance, but cannot meet the necessity of parking at any parking place in accordance with the mobility of the bicycle. For this reason, a small and lightweight front wheel fixture that can be carried with one hand so that it can be easily installed and removed and can be easily carried and can be easily used by simply placing it on a parking surface is desired. On the other hand, if a block-like object is placed on an arbitrary parking surface, the portion becomes higher in a convex shape, and the road surface condition may be deteriorated.

Published Practical Showa 50-109355 Published practical use Showa 64-16495 gazette Published Utility Heisei 1-77588

The present invention has been made under the circumstances described above, and the first problem is the depth of the groove that can be carried and is small and light but can be positioned and held with the handle without being moved with the handle within the practical range. to facilitate the introduction of the front wheel into the groove while securing of the second object can that bicycle falling to eliminate the deterioration of the road surface conditions by partially protruding from the parking stop surface It is an object to provide a preventive tool.

The invention according to claim 1 for achieving the object described above is no vertical length of the block-shaped, placed on the parking stop plane of the bicycle that has been parked stopped in both stand, it is integrally put the front wheel, the bicycle according to the front wheel a of utilizing its own weight, the parking stop surface and bicycles fall preventer do that from the base to prevent overturning by stopping the swing of the front wheels so that the handle is not expired by friction,
Said platform consists elongated block, shape viewed from its longitudinal direction and has a trapezoidal long symmetrically lower base than the upper base, groove and draft groove fitted along the top surface longitudinal該台Is formed, the ends of the fitting groove and the guide groove are connected to each other,
Tire circular ground section and range periphery thereof including the depth of the front tire a groove consisting of a convex curved surface in the lower power sale along the contour when viewed tire from the rotation axis direction on the upper surface of the platform It said fitting groove to be fitted, said guide groove for guiding the front wheel to the fitting groove is provided with,
One end of the guide groove communicates with an end in the longitudinal direction of the fitting groove, and the other end is open to the outside at the end of the base in the longitudinal direction. A longitudinal gradient center position O1 of the fitting groove and a position passing through a perpendicular line from the tire center of the front wheel when the front wheel is fitted into the fitting groove; There met, a longitudinal center position O2 of the stand is the fact that deviates at least 15mm with respect to the center position O1 of the fitting groove.

In the first aspect of the present invention, the present invention engaging Ru bicycle fall preventer (hereinafter. Referred to wheel fixture) is able to carry along with the bicycle to any place to be parked is possible carry, parking By simply placing it without fixing it to the stop surface, it is possible to use the weight of the bicycle to make it difficult to turn the steering wheel, thereby preventing the bicycle from falling.

It is a perspective view of a front wheel fixture. (A) is a top view of a front wheel fixing tool, (b) is a center part longitudinal cross-sectional view of a front wheel fixing tool, (c) is the side view which looked at the front wheel fixing tool from arrow A in (a). It is an enlarged view of a front wheel tire and a rim part. It is a perspective view of a front wheel fixture (common to specimens 1 and 3) in an experimental example. It is a perspective view of the front wheel fixture (specimen 2) in an example of an experiment. It is the front view which showed arrangement | positioning of the bicycle in a test example, a front wheel fixing tool, and a spring balance. (A) is the state of the specimen 1 with respect to the front wheel, (b) is the state of the specimen 2 with respect to the front wheel, and (c) is a diagram illustrating the state of the specimen 3 with respect to the front wheel. It is a cross-sectional view of a front wheel fixture constituted by an elastic body. It is a GG longitudinal cross-sectional view in FIG. 8 of the front wheel fixing tool comprised with the elastic body. It is a perspective view of the conventional front wheel fixing tool (patent document 1 correspondence). It is a front view of the conventional front wheel fixing tool (patent document 1 correspondence). It is a perspective view of the conventional front wheel fixing tool (patent document 2 correspondence). It is the perspective view which showed the use condition of the conventional front wheel fixing tool (patent document 2 correspondence). It is a front view of the conventional front wheel fixing tool (patent document 3 correspondence). It is a side view of the conventional front wheel fixing tool (patent document 3 correspondence).

[First Embodiment]
This will be described with reference to FIGS. Placed on the parking surface of the bicycle parked at the balance stand, put the front wheels together and unite, and stop the front wheels from swinging so that the handle can not be broken by using the weight of the front wheels and friction with the parking surface It is an example of the front wheel fixture which consists of the small and lightweight stand 1 which can be carried.

  The table 1 is composed of a vertically long block with a substantially kamaboko shape, and the shape viewed from the arrow A which is the longitudinal direction is symmetrical with the lower base F being longer than the upper base E as shown in FIG. It has a trapezoidal shape. A fitting groove 4 for fitting with the lower part of the front wheel is formed along the longitudinal direction of the upper surface of the table 1, and a guide groove 5 for guiding the front wheel is formed in the fitting groove 4.

  The base 1 does not have to be large and heavy enough to support the bicycle with the base 1 alone and allow the bicycle to stand on its own, with the front wheel of the bicycle standing on the rear stand placed on the base 1 A minimum size that can form a groove sufficient to integrate the wheel with the front wheel is sufficient. This is because the weight of the bicycle is transmitted to the base 1 through the front wheels, and this load contributes to the frictional force between the lower surface of the base 1 and the parking surface. The weight of the base 1 may be light. As the material, an appropriate solid material such as synthetic resin, rubber or wood can be used.

  In the prototype manufactured as a front wheel fixture applied to a bicycle having a front wheel with a radius of 26 mm, the overall length L1 of the table 1 in the longitudinal direction L1 = 300 mm, the size of the upper base E = 56 mm, and the lower base F (the width of the base 1) The dimension is 125 mm, the height dimension K of the table 1 is K = 28 mm, and the end face in the lateral width direction is not vertical, but is an inclined surface heading toward the center of the table 1 with an ascending slope angle θ1 = 30 degrees. A smaller angle of about 15 to 29 degrees may be used in order to make it easier for the vehicle to cross the table 1.

  The fitting groove 4 is positioned approximately in the middle of the front, rear, left, and right of the upper surface of the base 1, and the groove width is such that it fits loosely into the tire. In the prototype, the groove width dimension W was set to 40 mm. As shown in FIG. 3, the groove has a depth of several centimeters including the ground contact portion 15 and the periphery of the tire 14 in the front wheel, and a maximum tire height h, preferably about 1/2 h. Is curved downward along a circular contour when viewed from the direction of the rotation axis. The depth is such that the operator can feel the resistance as a resistance when the front wheel of the bicycle that has entered the platform 1 is fitted into the curved surface of the fitting groove 4. The height of the platform 1 is made as low as possible to reduce the amount of protrusion from the road surface. In the prototype example, the groove length L2 of the fitting groove 4 was 200 mm, the depth dimension d1 of the groove was 24 mm, and the margin distance J from the end of the fitting groove to the end of the table 1 was 30 mm.

  One end of the guide groove 5 for guiding the front wheel to the fitting groove 4 communicates with the end of the fitting groove 4 in the longitudinal direction, and the other end of the guide groove 5 enters the outside at the end of the table 1 in the longitudinal direction of the table 1. While being open, it is formed in an ascending gradient from the other end side toward the one end side. In the prototype, the thickness dimension t = 10 mm from the bottom of the guide groove 5 to the bottom of the base 1 at the end of the base 1, and the length dimension z = 10 mm of the boundary portion 6 between the fitting part 4 and the guide groove 5. The depth d2 of the boundary portion is 7 mm, and the gradient angle θ2 of the guide groove is 11 degrees.

  Compared with the means of the prior art (c) described above. In the prior art, the transfer groove 108 is a horizontal groove without a gradient. Therefore, if the height of the transfer groove 108 is adjusted to the height of the entrance of the parking groove 107, the entrance height of the transfer groove 108 is equal to the height of the parking groove 107. Thus, a high step is formed at the entrance of the transfer groove 108 which is the entrance portion of the front wheel. On the contrary, if the entrance of the transfer groove 108 which is the entrance part of the front wheel is lowered to make the step small, the horizontal entrance groove of the transfer groove 108 is connected to the entrance of the parking groove 107 with a horizontal groove. Since the entrance height of the parking groove 107 must also be lowered, the depth of the parking groove 107 becomes shallow as a result, and the positioning function and the locking function of the front wheel are lowered.

On the other hand, in this example, since the guide groove 5 has an upward slope from the entrance to the back, the entrance height of the guide groove 5 is lowered to facilitate the entrance of the front wheel, and the end portion of the guide groove 5 (fit) Since the height of the inlet portion of the mating groove can be increased, the depth of the fitting groove 4 can be ensured to such an extent that the positioning function of the front wheels does not deteriorate.
The boundary part where the ends of the fitting groove 4 and the guide groove 5 are connected to each other is the part where the groove depth is shallowest because both grooves of the climbing slope intersect, but the minimum depth that can guide the front wheel, In this example, since the groove having the depth dimension d2 = 7 mm is held, the front wheel can be reliably guided from the guide groove to the fitting groove.

When the bicycle is parked on a level and flat road surface, the handle position is relatively stable. In particular, the bicycle is parked with the tilted parking surface facing the direction of the vehicle train so as to intersect the tilted direction. In this case, the handle tends to be released due to the downward tendency of the inclination, and when the handle is released as described above, it becomes an unstable state that is extremely easy to fall. For example, the direction of travel of the bicycle (the direction of the train) is directed to a road surface having a gradient of a degree attached to the L-shaped side groove formed at the end in the width direction of the road in a direction crossing the direction in which the inclination is maximum. When the front wheel fixing tool according to the present invention is not used when parked, the steering wheel can be inclined downward with a slight external force or no external force. Falls in the downward direction. Or it is very easy to fall. On the other hand, when the front wheel fixture of the present invention is used, even in such a case, the handle is not broken and a stable state can be obtained.
The front wheel fixing device of the present invention is small and light enough to be carried, and can be carried, for example, by putting it in a basket attached to a bicycle, and can be used on an occasional basis as needed. The front wheel is easily guided through the groove to the predetermined fitting position of the fitting groove so as to be integrated with the front wheel, and the necessary frictional force between the front surface and the parking surface using the weight of the bicycle applied to the front wheel. Thus, even if the parking surface is inclined, it is possible to easily prevent the front wheels from swinging easily.

<Experimental example 1>
An experiment was conducted to compare the magnitude of the load at which the handle starts to move when several specimens with different dimensions were used and when the table was not used.
Specimen 1:
Prototypes having approximate numerical values as described above for the dimensions of each part of the table 1 were made by cutting polystyrene foam, and in the experimental example, 125 mm (corresponding to the lower base F) was formed at the bottom of the prototype as shown in FIG. ) × 300 mm (corresponding to the total length L1), thickness 6 mm, and the front and back both sides of the rough-cut plate 7 are stacked and attached with an adhesive to obtain a specimen 1. The total weight is 300 g. In FIG. 4, the specimen 1 has a center position O1 in the longitudinal direction of the fitting groove 40 and a position through which a perpendicular drawn from the tire center of the front wheel passes when the front wheel is fitted in the fitting groove 4. The center position O2 in the longitudinal direction of the plate 7 is deviated by 15 mm rearward in the direction in which the bicycle enters the fitting groove 4 with respect to the groove center position O1.

Specimen 2:
In FIG. 5, the base 10 is a rectangular parallelepiped, the overall length L1 in the longitudinal direction is 300 mm, the lateral width F ′ of the base 10 is F ′ = 125 mm, the height of the base 10 is K = 30 mm, the groove width is W = 40 mm, and the groove length is L2 = A plate having the same finishing state and the same size as those of the plate 7 in the specimen 1 (indicated by reference numeral 7 for convenience) was attached to the bottom of the table with an adhesive, with the depth d1 of the groove being 220 mm and the depth d1 = 20 mm. The specimen 2 substantially matches the center position O1 in the longitudinal direction of the fitting groove 40 and the position through which the perpendicular drawn from the tire center of the front wheel passes when the front wheel is fitted in the fitting groove 4; The groove center position O1 coincides with the longitudinal center O2 of the plate 7.

Specimen 3:
The specimen 1 shown in FIG. 4 is disposed in the front-reverse direction, and the longitudinal center position O2 of the plate 7 with respect to the groove center position O1 is the direction in which the bicycle enters the fitting groove 4. It is displaced 15mm forward.

  FIG. 6 shows an outline of the experimental apparatus. A floor board in which varnish was applied to wood was used as a parking surface 8, and a general bicycle having a front wheel 11 having a radius of 26 mm was parked at the balance stand 9. The handle 22 is set in a state where the bicycle advances straight (the steering is not turned), the test specimens 120 are placed in order under the front wheel, and a spring balance (shinwa measurement) is attached to the end of the handle without the test specimen. Co., Ltd .: Pipe hand balance 2Kg: Part number 75038) 13 was pulled and the load when the handle started to move was measured. In both the specimen 1 and the specimen 2, the experiment is performed in a state where the front wheel is properly fitted in the fitting groove 4.

In Table 1, in the experiment of “front wheel fixture: none”, the front wheel tire is directly on the floorboard. In the experiment with the specimen 1, as shown in FIG. 7A, the center of the plate 7 is shifted 15 mm rearward from the center of the fitting groove (tire center).
In the experiment with the specimen 2, as shown in FIG. 7B, the center of the plate 7 and the center of the fitting groove (tire center) are coincident.
In the experiment with the specimen 3, as shown in FIG. 7C, the center of the plate 7 is shifted 15 mm forward from the center of the fitting groove (tire center).

  In Table 1, even when a small and lightweight front wheel fixture of 300 mm (full length) x 125 mm (horizontal width) x 30 mm (height) and a weight of about 300 g is pulled when the handle starts to move when no frame is used on the front wheel As a result, it finally began to move with a load more than double that of the load 220 g. In addition, a larger load is required to start moving compared to the case where the center of the bottom portion of the table 1 is shifted with respect to the center of the fitting groove 4.

<Experimental example 2>
The same specimen as the above experimental example was used. The difference is that the material of the parking surface is changed.
The bicycle is parked on the floor board coated with varnish on wood as in Experimental Example 1, and the anti-slip sheet (Sambelum Co., Ltd., product name: non-slip net mat, quality: chloride) is placed on the floor board at the front wheel position. A vinyl resin (size: about 40 × 65 cm) is laid, and a foamed polystyrene plate (160 mm × 320 mm × 30 mm) is placed thereon. On the foamed polystyrene plate, the same test sample as in Experimental Example 1 is used, and the same experiment is performed. Went. In both the specimen 1 and the specimen 2, the experiment is performed in a state where the front wheel is properly fitted in the fitting groove 4.

In Table 2, in the experimental state of “front wheel fixture: none”, the front wheel tire is directly on the expanded polystyrene plate. The reason why the tensile load when the handle starts to move is larger than that of Experimental Example 1 because the friction coefficient of the parking surface by the foamed polystyrene plate is larger than that of the floor plate.
It is an experimental example that the load when the center of the plate 7 is deviated from the case of the specimen 2 that coincides with the center of the fitting groove (the center of the tire) is large and the effect of fixing the front wheels tends to be large. 1, the relationship between the tendency of deviation and the load is as follows. In Table 1, the load on the specimen 3 is larger, whereas in Table 2, the specimen 2 has a slightly larger load.

  What can be said through Experimental Example 1 and Experimental Example 2 is that the front wheel is properly fitted in the fitting groove even with a small and light front wheel fixture, for example, a load of about 750 g on the specimen 1 in Table 1 above. If it is, there is an effect of preventing the rotation of the handle, and it is considered that there is some practicality. If a further anti-rotation effect is expected, if the material with a large coefficient of friction is appropriately attached to the back side of the base 1 or if three to four protrusion-like support portions are provided, the handle will become more difficult to turn. Conceivable.

  The specimen 1 having a guide groove, which is located behind in the direction of entry, can be carried and is small and light, but it can be positioned and held with the handle without being moved with the handle within the practical range. The guide groove can facilitate the introduction of the front wheel into the fitting groove while ensuring the depth of the groove that can be formed, and the guide groove has a slope, so the depth of the fitting groove that holds the front wheel There is an effect that the step at the entrance portion of the guide groove to the fitting groove can be made as small as possible. In order to make it difficult to turn the handle, an appropriate friction means may be installed on the bottom of the table as described above.

  Further, when comparing Table 1 (Experimental Example 1) and Table 2 (Experimental Example 2), the load of the specimen 2 is larger in Table 1, whereas the load of the specimen 1 is slightly higher in Table 2. The trend is reversed. Although the cause of this is not clear, the specimen 1 and the specimen 2 are simply the same thing placed in the front-rear direction, and both have a certain effect on the rotation of the handle. If the guide grooves 5 are provided on both sides in the direction, the convenience of ease of use increases as much as it is not necessary to care about the front-rear direction when placing the front wheel fixture on the parking surface.

  As described above, for each of the specimens 1, 2, and 3, even with a small and lightweight front wheel fixture, using the weight of the bicycle applied to the front wheel, even if the tensile load when the handle starts to move is large or small, It was confirmed that there was a function to make it difficult to turn around. Further, in the configuration of the specimen 1, the guide groove 5 is provided with a gradient so that the front wheel can be easily guided to the guide groove 5 from the entrance of a low step, and the fitting groove 4 is necessary while providing such a guide function. Since it can be deepened according to, it is excellent in practicality. By sticking a plate-like anti-slip uniformly on the bottom, or by providing a protrusion-like anti-slip on the bottom of the table 1 at three or four points, the tensile load when the handle starts to move can be increased.

[Second Embodiment]
The front wheel fixture as described in the first embodiment is portable and can be placed at any place. For this reason, the dimensions are made low so as not to create a large level difference, but it is possible that a car (automobile, bicycle, etc.) rarely crosses even in a parking place where a car cannot pass. The shape is a trapezoid with a gently sloping surface where both left and right ends are ascending, making it easier for the car to ride on the gently sloping surface on the side. If the entire structure is made of an elastic material so as to restore the previous state, the effect of the step state can be reduced.

[ Reference example ]
As shown in FIGS. 8 and 9, as in the first embodiment, the base 1 having the fitting groove 4 and the guide groove 5 is formed by an elastic material block 17 such as urethane resin or sponge, A sealed container is configured by covering it with an elastic film 18 such as rubber, and an opening 20 formed on the side of the sealed container 18 is formed in the main body 19 formed of the sealed container composed of the elastic material block 17 and the elastic film 18. It was set as the structure which attached the pump chamber 21 connected through this. Pump chamber 21 covered the opening 20 in the film by the elastic member, and configured adhered firmly to the side of the sealed container 18 the region where the opening 20 is provided so as to surround without gaps. A reinforcing plate 22 having a thickness of several millimeters is fixed to the bottom of the main body 19 in order to maintain stability in the installed state of the main body 19 made of an elastic material.

  Further, in the pump chamber 21, when the body 19 is crushed by a load, such as when it is crushed by the load, the air inside the sealed container 18 is sucked to expand the film made of an elastic material, and the load is removed. The main body portion crushed by the internal pressure energy stored at the time of expansion is expanded so as to restore the main body portion 19 to a state before receiving a load. Since the elastic material block 17 is covered and protected by the sealed container 18, the elastic material block 17 is protected from rain, dust, etc., and there is a room for selecting a material having a high restoration performance. Restorability can be improved.

DESCRIPTION OF SYMBOLS 1, 10 4, 40 Fitting groove 5 Guide groove 6 Boundary part 7 Plate 8 Resting surface 11 Front wheel 13 Spring balance 14 Tire 15 Grounding part 16 Rim 17 Elastic block 18 Sealing container 19 Main body part 20 Opening 21 Pump chamber 22 Handle 100 Body 102 Concave groove 103 Non-slip member 104 Fitting groove 105 Block body 106 Slope surface 107 Retaining groove 108 Transfer groove 109 Inclined surface 120 Specimen θ1 Angle A View E Upper base d1, d2 Depth dimension F Lower base F ' Horizontal width dimension ΔH Height difference h Tire height K Height dimension L1 Groove length L2 Length O1, O2 Center position t Thickness dimension W Groove width dimension z Length dimension

Claims (1)

No vertical length of the block-shaped, placed on the parking stop plane of the bicycle that has been parked stop at both stand and includes integrally put the front wheel, using the weight of the bicycle according to the front wheel, the handle by friction with the parking stop surface Gakire no way a bicycle fall preventer Do that from the base to prevent overturning by stopping the swing of the front wheels,
Said platform consists elongated block, shape viewed from its longitudinal direction and has a trapezoidal long symmetrically lower base than the upper base, groove and draft groove fitted along the top surface longitudinal該台Is formed, the ends of the fitting groove and the guide groove are connected to each other,
Tire circular ground section and range periphery thereof including the depth of the front tire a groove consisting of a convex curved surface in the lower power sale along the contour when viewed tire from the rotation axis direction on the upper surface of the platform It said fitting groove to be fitted, said guide groove for guiding the front wheel to the fitting groove is provided with,
One end of the guide groove communicates with an end in the longitudinal direction of the fitting groove, and the other end is open to the outside at the end of the base in the longitudinal direction. A longitudinal gradient center position O1 of the fitting groove and a position passing through a perpendicular line from the tire center of the front wheel when the front wheel is fitted into the fitting groove; There matched, the fitting groove bicycle fall preventer you characterized in that the longitudinal central position O2 of the board is displaced at least 15mm with respect to the center position O1 of.

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