JP5825596B2 - Bicycle for practice - Google Patents

Description

  The present invention relates to a traveling practice bicycle that is used as a bicycle that travels with a driving force by stepping on a pedal by cultivating a sense of balance and operation technology with the motorcycle body itself, and by connecting a pedal unit to the motorcycle body. The present invention relates to a bicycle for running practice in which a structure related to a connection portion for connecting the pedal unit and the pedal unit is devised and the strength of the connection portion is enhanced.

  In Patent Document 1 below, there is an idea related to a bicycle for running practice that can assist in cultivating operation techniques and a sense of balance, and that can be shortened by shortening the practice period without being damaged by hitting the pedal. Proposed.

  This device is composed of a vehicle body, a connection part, and a pedal unit. A connection part is fixed below the middle stage of the vehicle body, a storage space is formed in the connection part, and a storage space is installed corresponding to the connection part. The connecting part is formed with a pivot end and a fixed rod, the pivot axis corresponds to the pedal unit, the pedal unit is pivoted at the pivot end of the connection part, and the fixed rod on the connection part is fixed by the fixing screw. By being fixed in the storage space, the connection component can be installed or removed from the storage space. With this configuration, when a child is practicing bicycle riding, the body can first be used to practice balance and operational control, and the pedal unit does not interfere with both feet. Is supposed to be obtained. In this traveling practice bicycle, two fixing screws are penetrated in parallel in the left-right direction, and the vehicle body and the connecting parts are connected.

  A conventional traveling practice bicycle 10 shown in FIG. 4 includes a two-wheeled vehicle body 20 and a pedal unit 30 having a connecting portion. In this traveling practice bicycle 10 as well, the connection between the two-wheeled vehicle body 20 and the connecting portion of the pedal unit 30 is made by penetrating two fixing screws 40 in parallel in the front-rear direction, as shown in FIG. Moreover, since the connection parts are provided in the two-wheeled vehicle body 20 and the pedal unit 30 and these connection parts are connected via the columnar body 50, the size (length) of the connection part tends to increase. is there.

Utility Model Registration No. 3093576

  Thus, in the conventional bicycle for running practice, two fixing screws are penetrated in parallel to connect the vehicle body and the pedal unit. However, in this connection mode, although it has strength against stress from one direction (the one in Patent Document 1 is the left-right direction and the one in FIG. 4 is the front-rear direction), it is vulnerable to stress from the other direction. When the pedal unit is subjected to an unusual stress, there is a problem that the connection portion is twisted. The twisting of the connection part causes the chain to move by twisting the chain and causing the chain to come off. Even if the twisting of the connection portion remains slight, the bicycle performance is greatly affected, for example, a sense of incongruity occurs when the pedal is depressed, and the driving force cannot be efficiently transmitted to the chain. In the examples of FIGS. 4 and 5, the size (length) of the connection location tends to increase, increasing the risk of the connection location being twisted. There is also a demand for improving the screwing of the two places with the fixing screw because it takes time.

  The present invention has been proposed in view of the above circumstances, and is configured such that the pedal unit is detachably connected to the two-wheeled vehicle body, and the two-wheeled vehicle itself cultivates a sense of balance and operation technology, and the pedal unit is connected to the two-wheeled vehicle body. To provide a driving practice bicycle that can be used as a typical bicycle as well, strengthening the strength of the connection part that connects the two-wheeled vehicle body and the pedal unit, and making it easy to attach and remove the pedal unit With the goal.

  In order to achieve the above object, the present invention provides a two-wheeled vehicle body in which a cylindrical connecting portion having a storage space is provided below the middle stage and on which front and rear wheels are mounted, and is detachably connected to the connecting portion. For driving practice that is used as a bicycle that is driven by driving force by stepping on the pedal by connecting the pedal unit to the connecting part, cultivating a sense of balance and operation technology with the motorcycle body itself In the bicycle, the connection portion is provided with a pair of connection portion side holes penetrating through the bolts and a pair of slits extending to the end of the cylinder at different positions in the circumferential direction, and the pedal unit includes the pivot shaft portion and A chain wheel provided on the shaft end of the pivot shaft portion and two cranks provided with the pedal; and a perpendicular extension to the pivot shaft portion, together with the connecting portion side hole and the bolt A pair of unit side holes that are passed through and a receiving portion that has a pair of convex portions that engage with the slit, and the receiving portion is inserted into the storage space, and the connecting portion side hole and the unit side The pedal unit is connected to the connecting portion by being supported by two directions of the axial direction of the bolt formed through the hole and the axial direction formed by the convex portion engaged with the slit. To do.

In particular, the present invention provides a pair of reinforcing members that abut against the rear side of the connecting portion between the chassis portion of the two-wheeled vehicle body and the rear side of the connecting portion, or the shortest distance from the convex portion to the pivot shaft portion. Is L, and the shortest distance from the unit side hole to the pivot shaft portion is l, the difference ΔL is preferably 0 to ± 2.0 cm, and almost all of the receiving portion is inserted into the storage space. More preferably. Moreover, it is also a preferable structure that the convex part is formed of a rod-like member that penetrates the accommodated part.

  In the present invention, a pair of connecting portion side holes penetrating through the bolts and a pair of slits extending to the end of the tube are provided at different positions in the circumferential direction in the cylindrical connecting portion having the storage space. The stored portion of the pedal unit has a pair of unit side holes that are penetrated by the bolts and a pair of convex portions that engage with the slits together with the connection side holes. The receiving portion is inserted into the receiving space, and is supported by two directions of the axial direction of the bolt formed through the connecting portion side hole and the unit side hole, and the axial direction formed by the convex portion engaged with the slit. It is. Therefore, in the present invention, the connection portion between the two-wheeled vehicle body and the pedal unit can resist the stress received from the two directions of the axial direction through which the bolt penetrates and the axial direction of the convex portion engaged with the slit. It is possible to prevent twisting when an unusual stress is applied to the. In addition, since the connection work with the bolt is only required at one place, it is easy to attach and remove the pedal unit.

  Furthermore, in the present invention, if the two-wheeled vehicle body is provided with a pair of reinforcing members that abut against the rear side of the connecting portion, it is possible to further strengthen the resistance force against the external stress of the connecting portion itself. If the shortest distance from the convex portion to the pivot shaft is L and the shortest distance from the unit side hole to the pivot shaft is l, the difference ΔL is 0 to ± 2.0 cm. Since it becomes the suitable structure which can resist stress, the intensity | strength of the connection location of a two-wheel vehicle body and a pedal unit can further be strengthened. If almost all of the receiving parts are inserted into the storage space, it is possible to prevent twisting by minimizing the size (length) of the connection portion. Moreover, if the convex portion is formed by a rod-like member that penetrates the accommodation portion, the accommodation portion of the pedal unit can be easily manufactured.

1 is a schematic overall view showing a traveling practice bicycle according to the present invention. FIG. 2 is an exploded schematic overall view drawn with the pedal unit removed from the traveling practice bicycle shown in FIG. 1. It is a principal part enlarged view in the bicycle for driving practice which concerns on this invention. It is a schematic whole view which shows the conventional bicycle for driving practice. FIG. 4 is an enlarged view of a main part shown in FIG. 3 according to a conventional traveling practice bicycle.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment that exemplifies a traveling practice bicycle according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the traveling practice bicycle 1 according to the present invention is provided with a connecting portion 21 below the middle stage, a saddle portion provided above the connecting portion 21, a handle portion, a front wheel, The motorcycle includes a two-wheeled vehicle body 2 equipped with rear wheels and the like, and a pedal unit 3 that is detachably connected to a connecting portion 21 of the two-wheeled vehicle body 2. When a child develops a bicycle operation technique and a sense of balance, the pedal unit 3 can be used without being connected to the connecting portion 21 so that the pedal unit 3 does not interfere with both feet. On the other hand, if the pedal unit 3 is connected to the connecting portion 21, it can be used as a normal bicycle. If the pedal unit 3 is connected to the connecting portion 21, a normal bicycle is obtained. Therefore, a wheel portion for meshing a chain 5 for transmitting a driving force generated by depressing the pedal is transmitted to the rear wheel of the two-wheeled vehicle body 2. Is provided.

  As shown in FIG. 2, the connecting portion 21 of the two-wheeled vehicle body 2 is formed in a round cylindrical shape having a storage space that can be stored from the end 21 a to the inside. On the cylinder surface, a pair of connection part side holes 211 that penetrates the bolts 4 and a pair of slits 212 that extend to the cylinder end are provided at different positions in the circumferential direction. In the present embodiment, a pair of connection part side holes 211 are provided in the front-rear direction of the two-wheel vehicle body 2, and a pair of slits 212 are provided in the left and right (width) direction of the two-wheel vehicle body 2. Are provided every 90 degrees. As the bolt 4, a known bolt corresponding to the diameter of the connection portion side hole 211 may be used.

  In addition, as shown in FIGS. 1 and 2, the two-wheel vehicle body 2 is provided with a pair of plate members 22 as a pair of reinforcing members that abut against the rear side of the connection portion 21. In the present embodiment, the plate material 22 is of a substantially triangular Ella-like shape that is inclined upward from the rear side of the connecting portion 21 toward the rear side. In particular, the lower end of the plate member 22 is extended to a position at substantially the same level (height) as the upper end portion of the slit 212 and is abutted against the rear side of the connecting portion 21. In addition to the plate member 22, for example, two (a pair) rod-shaped members may be employed as the reinforcing member. By providing the rod-like member so as to straddle between the chassis portion of the two-wheeled vehicle body 2 and the rear side of the connecting portion 21, and by taking the role of a replacement rod, the strength of the connecting portion 21 itself can be improved. Also in this case, it is preferable that the position of the end portion of the rod-shaped member that abuts on the rear side of the connection portion 21 is substantially the same level as the upper end portion of the slit 212. The reinforcing member 22 may be provided by welding from the two-wheel vehicle body 2 to the rear side of the connecting portion 21.

  In particular, as shown in FIG. 3, the pedal unit 3 includes a columnar pivot shaft 31 and two cranks each including a chain wheel 32 and a pedal 33a provided on the shaft end of the pivot shaft 31. 33 and a receiving portion 34 extending perpendicularly to the pivotal shaft portion 31. The accommodated portion 34 is formed in a round cylindrical shape having a diameter that can be inserted into the accommodation space of the connection portion 21 of the two-wheeled vehicle body 2. A pair of convex portions 342 that engage with the pair of unit side holes 341 and the slits 212 that pass through the bolt 4 are provided on the cylindrical surface together with the connection portion side holes 211 of the two-wheeled vehicle body 2. The convex portion 342 is provided in a direction facing the chain wheel 32, the pedal 33a, and the crank 33 on the cylindrical surface, and the convex portion 342 and the unit side hole 341 are provided every 90 degrees in the circumferential direction. In addition, since the diameter of the unit side hole 341 is penetrated by the bolt 4 together with the connection portion side hole 211, it is preferable to match the diameter of the connection portion side hole 211.

  In the present embodiment, the pedal unit 3 has a pair of convex portions 342 formed by end portions of rod-shaped members that pass through the accommodated portion 34. The convex portion 342 can be formed by passing a rod-shaped member through a pair of rod-shaped member holes provided in advance and welding the end portions thereof. Further, the unit side hole 341 and the convex part 342 are respectively set such that the shortest distance from the convex part 342 to the pivot shaft part 31 is L, and the shortest distance from the unit side hole 341 to the pivot shaft part 31 is l. The difference ΔL (L−1) is provided to be 1.3 cm. A well-known means can be used for the two cranks 33 provided with the chain wheel 32 and the pedal 33a.

  As shown in FIG. 1 and FIG. 3, in the traveling practice bicycle 1 according to the present invention, the convex portion 342 is engaged with the slit 212, and almost all of the storage portion 34 is inserted into the storage space of the connection portion 21. Thus, the two-wheeled vehicle body 2 and the pedal unit 3 are connected. Specifically, while the convex portion 342 is engaged with the slit 212, the storage portion 34 is inserted into the storage space of the connection portion 21, and the unit side hole 341 appears at the position where the connection portion side hole 211 is provided. Sometimes, the bolt 4 passes through the connecting portion side hole 211 and the unit side hole 341 together to fix and connect the pedal unit 3 to the two-wheeled vehicle body 2.

  The almost entire storage portion 34 to be inserted into the storage space of the connection portion 21 is that the pivot shaft portion 31 is cylindrical and the storage portion 34 is round, so that the convex portion 342 is slit 212. When the end portion 21a of the connection portion 21 is brought into contact with the pivotal shaft portion 31 after being engaged with each other, a part 34a of the storage portion 34 is exposed without being stored in the storage space of the connection portion 21. means. That is, in the present embodiment, the traveling practice bicycle 1 inserts the storage portion 34 into the storage space of the connection portion 21 of the two-wheeled vehicle body 2 until the end portion 21a of the connection portion 21 abuts on the pivot shaft portion 31. The unit side hole 341 appears at the position where the connection part side hole 211 is provided.

  When the two-wheeled vehicle body 2 and the pedal unit 3 are connected to each other, the bicycle for practice 1 has a convex portion in which the receiving portion 34 is engaged with the axial direction of the bolt 4 (the front-rear direction of the two-wheeled vehicle body 2) and the slit 212. The rod-shaped member that forms the portion 342 is supported in two directions in the axial direction (the left-right direction of the two-wheeled vehicle body 2). Further, the convex portion 342 and the unit side hole 341 of the receiving portion 34 respectively have a shortest distance L from the convex portion 342 to the pivot shaft portion 31 and a shortest distance from the unit side hole 341 to the pivot shaft portion 31. Since the difference ΔL is 1.3 cm, the penetrated bolt 4 and the convex portion 342 are configured to have ΔL as the axial distance. In addition, in this embodiment, the axial direction distance from the convex part 342 to the lower end of the board | plate material 22 is 6 mm.

  When the traveling practice bicycle 1 in which the two-wheel vehicle body 2 and the pedal unit 3 are connected is used as a general bicycle, the chain 5 is fitted to the chain wheel 33 and the wheel portion of the rear wheel.

Further, in the pedal unit 3, when the shortest distance from the convex portion 342 to the pivot shaft portion 31 is L and the shortest distance from the unit side hole 341 to the pivot shaft portion 31 is l, the difference ΔL is larger than 0. It has been confirmed that if it is less than 2.0 cm, it is possible to provide a connecting portion with a resistance force that resists an assumed external stress, and to effectively prevent twisting of the connecting portion. The difference ΔL is preferable because the resistance against resistance to external stress can be improved as it approaches 0 cm. The reason why ΔL does not become 0 cm is that the bolt 4 and the rod-shaped member forming the convex portion 342 cannot intersect on one plane.
Furthermore, the axial distance from the convex portion 342 to the lower end of the plate member 22 is also preferable because the resistance against resistance to external stress can be improved as it approaches 0 cm. And the lower end of the board | plate material 22 which hits the back side of the connection part 21 is not only the form located in the level above the convex part 342 as shown in FIG. 1, FIG. 2, but the form located in a lower level. Even so, it is preferable.

  As described above, in the traveling practice bicycle 1 according to the present invention, the storage portion 34 is supported in two directions, that is, the axial direction of the bolt 4 and the axial direction of the rod-shaped member forming the convex portion 342. And the pedal unit 3 are connected. Therefore, by resisting this stress by the two axes, even if an unusual stress is applied to the pedal unit 3 from various directions, the connection portion formed by the connection portion 21 and the accommodated portion 34 is twisted. Can be prevented. Further, since the axial distance between the bolt 4 and the convex portion 342 is ΔL (1.3 cm) and the axial resistance force resisting external stress is concentrated within the range of ΔL, the twist of the connection portion is prevented. It can be effectively prevented. The resistance against the external stress of the connecting portion 21 itself is further increased by providing a pair of plate members 22 that abut against the rear side of the connecting portion 21 on the two-wheeled vehicle body 2 with an axial distance of 6 mm from the convex portion 342 to its lower end. It has been strengthened.

  Furthermore, since the receiving part 34 is inserted into the storage space of the connecting part 21 of the two-wheeled vehicle body 2 until the end 21a of the connecting part 21 abuts on the pivotal shaft part 31, the connecting part 21 and the receiving part 34 The connection location formed in (1) does not exceed the size (length) of the connection portion 21. That is, since the region (connection location) where the twist may occur can be minimized, the twist of the connection location can be prevented also from this viewpoint. Moreover, the connection work by the bolt 4 is only required at one place, and the pedal unit 3 can be easily attached to and detached from the two-wheeled vehicle body 2.

  As described above, in the present invention, the structure related to the connection portion connecting the two-wheel vehicle body 2 and the pedal unit 3 is devised, the strength of the connection portion is strengthened, and the pedal unit 3 is attached to the two-wheel vehicle body 2; The bicycle 1 for driving practice that can be easily detached is achieved.

  As mentioned above, although one Embodiment of this invention was illustrated and explained in full detail, this invention is not limited to the said embodiment. The present invention can be modified in various ways without departing from the scope of the claims.

  For example, in the above-described embodiment, the bicycle for traveling practice provided with a circular cylindrical connection portion and a accommodated portion has been illustrated and described. However, the shape of the connection portion and the accommodated portion is, for example, a rectangular tube shape. Also good. With the rectangular tube-shaped configuration, it is possible to obtain an effect that it is easy to store the receiving portion in the storage space of the connection portion. Furthermore, if it is made a prismatic shape up to the pivot shaft part, the entire receiving part can be stored in the storage space of the connecting part, and the size (length) of the connecting portion formed by the connecting part and the receiving part ) Can be minimized.

  Further, in the above embodiment, as illustrated in FIG. 3 and the like, the configuration in which the unit side hole is provided at a distance closer to the pivot shaft portion than the convex portion is described as an example, but the opposite configuration is used. May be. Even in such a configuration, when the shortest distance from the convex portion to the pivot shaft portion is L and the shortest distance from the unit side hole 341 to the pivot shaft portion 31 is l, the difference ΔL (l−L ) Greater than 0 and less than 2.0 cm, and by concentrating the axis that resists external stress within the range of ΔL, it is possible to effectively prevent torsion of the connection points. Furthermore, as the pair of reinforcing members that abut against the rear side of the connecting portion, members having various shapes such as a substantially triangular shape and a rod shape can be adopted. The lower end of the reinforcing member that hits the rear side of the connecting portion is at the same level as the level at which the connecting portion and the accommodated portion are fixed by the bolt and the convex portion, so that a resistance force that resists external stress can be provided. it can.

  Moreover, even if the rod-shaped member which penetrates a to-be-stored part is a volt | bolt, a pair of convex part can be formed. Further, instead of the configuration in which the pair of convex portions is formed by the rod-shaped member that penetrates the accommodated portion, the configuration in which the pair of convex portions is formed by the rod-shaped member that penetrates the accommodated portion with a bolt is used. The structure which provides a pair of convex part by arbitrary means on a cylinder surface may be sufficient. With this configuration, the difference ΔL when the shortest distance from the convex portion to the pivot shaft portion is L and the shortest distance from the unit side hole to the pivot shaft portion is l can be set to 0 cm. By concentrating the resisting force of the shaft that resists to one plane, it is possible to more effectively prevent twisting of the connection portion.

  In addition, in the above-described embodiment, a pair of connecting portion side holes are provided in the front-rear direction of the two-wheeled vehicle body, and the connecting portion side holes and slits are provided every 90 degrees in the circumferential direction. The configuration corresponding to the above has been described as an example. However, in order to configure the present invention, as long as the configuration is such that the receiving portion is supported by two directions of the axial direction of the bolt and the axial direction of the convex portion and the pedal unit is connected to the connecting portion, the connecting portion side hole or the like An arbitrary position may be provided. However, the configuration in which a pair of connecting part side holes are provided in the front-rear direction of the two-wheeled vehicle body is preferable because it can perform a connecting operation of penetrating the bolt into the connecting part side hole without being interrupted by the chain wheel or the crank. Thus, the present invention meets the problem to be solved.

  In addition, in the bicycle for running practice according to the present invention, the height adjustment means of a general bicycle, such as the height of the saddle portion and the height of the handle portion, is provided to adjust the height according to the growth of the child. It is possible to adopt a configuration that can be used.

1 ... Bicycle for practice practice (present invention)
2 ... Two-wheeled vehicle body 21..Connection portion 211.Connection portion side hole 212.Slit 21a.End portion 22..Plate material (reinforcing member)
3 ... Pedal unit 31 ... Pivot shaft 32 ... Chain wheel 33 ... Crank 33aPedal 34 ... Storage part 341 / Unit side hole 342 / Protrusion 34a / Part of storage part 4. ..Bolt 5 ... Chain 10
20 .. Motorcycle body (conventional)
30 ・ Pedal unit (conventional)
40-bolts (conventional)
50 ・ ・ Cylinder

Claims (5)

A two-wheeled vehicle body having a cylindrical connecting portion having a storage space provided below the interruption and having a front wheel and a rear wheel mounted thereon, and a pedal unit detachably connected to the connecting portion, the two-wheeled vehicle body itself In a bicycle for traveling practice that is used as a bicycle that travels with the driving force by stepping on the pedal by connecting the pedal unit to the connection part, cultivating a sense of balance and operation technology,
In the connection part, a pair of connection part side holes penetrated by the bolts and a pair of slits extending to the tube end are provided at different positions in the circumferential direction,
The pedal unit includes a pivot shaft, a chain wheel provided on a shaft end of the pivot shaft, two cranks provided with the pedal, and a perpendicular to the shaft end of the pivot shaft. Including a pair of unit side holes that pass through the bolt together with the connection portion side hole and a receiving portion having a pair of convex portions that engage with the slit,
The storage portion is inserted into the storage space and has an axial direction formed by an axial direction of the bolt passing through the connection portion side hole and the unit side hole, and an axial direction formed by the convex portion engaged with the slit. Supported by two directions, the pedal unit is connected to the connecting portion;
This is a bicycle for practice driving. The pair of reinforcing members that abut against the rear side of the connection portion are provided between the chassis portion of the two-wheeled vehicle body and the rear side of the connection portion. bicycle. When the shortest distance from the convex portion to the pivot shaft portion is L and the shortest distance from the unit side hole to the pivot shaft portion is 1, the difference ΔL is 0 to ± 2.0 cm.
The traveling practice bicycle according to claim 1 or 2, characterized in that The storage part is almost entirely inserted into the storage space.
The traveling practice bicycle according to claim 1 or 2, characterized in that The convex portion is formed by a rod-shaped member that penetrates the receiving portion.
The traveling practice bicycle according to any one of claims 1 to 4, characterized in that:

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