JP2018083623A - Cycle for travel training - Google Patents

Abstract

The present invention provides a traveling practice bicycle in which the strength of a connection portion is enhanced, the accuracy of manufacturing and assembly is improved, and the connection work can be easily completed.
A body connection portion 21 of a two-wheeled vehicle body 2 of a traveling practice bicycle has column surfaces 211 and 212 on both sides in the front-rear direction which is a traveling direction, and a pair of bolt surfaces 4 penetrates the column surfaces 211 and 212. Through-holes 21a, 21b, and a hexagonal columnar shape in plan view in which plastically processed corners 21c are formed on both the left and right sides, and the unit connecting portions 34 of the pedal unit 3 are connected to the column surfaces 341 on both sides in the front-rear direction. When the unit connection portion 34 is connected to the main body connection portion 21 such as a pillar shape corresponding to the main body connection portion 21 such as the 342, the through holes 34a and 34b, and the corners 34c, the unit connection portion 34 is twisted in the traveling direction by the bolt 4. The corner 34c and the corner 21c of the main body connecting portion 21 are configured to prevent twisting from the left and right directions.
[Selection] Figure 3

Description

  The present invention allows the two-wheeled vehicle body itself to develop a sense of balance and operation technology, and is used as a bicycle for traveling practice that is used as a bicycle that travels with the driving force of stepping on the pedal by connecting a pedal unit to the two-wheeled vehicle body. In particular, the present invention relates to a bicycle for traveling practice in which a structural device is applied to a connection portion connecting a two-wheeled vehicle body and a pedal unit, and 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

  In the conventional traveling practice bicycle shown in Patent Document 1 and FIGS. 4 and 5, 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 due to the cylindrical body 50, 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 a pedal unit is detachably connected to a two-wheeled vehicle body, and the two-wheeled vehicle body itself can cultivate a sense of balance and operation technology, and the pedal unit is connected to the two-wheeled vehicle body. For driving practice bicycles that can also be used as general bicycles, structurally devise to strengthen the strength of the connection points connecting the two-wheeled vehicle body and the pedal unit, and to assemble and manufacture with high precision The purpose of the present invention is to provide a bicycle for driving practice that can be easily attached and detached.

  In order to achieve the above object, the present invention provides a two-wheeled vehicle body having a main body connecting portion having a storage space provided below the middle stage, to which front wheels and rear wheels are mounted, and a unit detachably connected to the main body connecting portion. It consists of a pedal unit equipped with a connecting part, and it is possible to cultivate a sense of balance and operation skills with the two-wheeled vehicle body, and driving with the driving force by stepping on the pedal by connecting the unit connecting part to the main body connecting part In the traveling practice bicycle used as a bicycle, the pedal unit includes the unit connection portion, a pivot shaft portion extending perpendicularly to the unit connection portion, and a shaft end of the pivot shaft portion. It consists of a chain wheel provided on the top and two cranks equipped with the pedals, and the unit connection part and the main body connection part are respectively traveling directions of the bicycle for running exercise The main body connecting portion has a surface on both sides in the front-rear direction, a hole penetrating through the bolt is formed on this surface, and a corner in the left-right direction of the traveling practice bicycle. The unit connection portion is inserted into the storage space while aligning the corners, and is connected by being fastened with the bolt.

  Furthermore, the unit connection part and the main body connection part are polygonal prism shapes having a pentagonal shape to a twentieth angle in plan view.

  In the present invention, the unit connecting portion of the pedal unit and the main body connecting portion of the two-wheeled vehicle body have surfaces on both sides in the front-rear direction in which the traveling bicycle travels, holes formed through the bolts are formed on the surfaces, and It is a polygonal prism shape with corners on the left and right sides of the bicycle for running exercise, and the unit connection part is inserted into the storage space of the main body connection part while aligning the corners, and it is fastened with bolts and connected is there. Therefore, the connecting portion between the two-wheeled vehicle body and the pedal unit has a structure that strongly resists the stress received from the traveling (front-rear) direction of the traveling practice bicycle by the penetrating bolt. Furthermore, by having the corners, the structure can resist the stress received from the left and right sides of the bicycle for practice, and the strength can be enhanced. Further, it is possible to prevent twisting when an unusual stress is applied to the pedal unit. Further, since the connection work using the bolts is only required at one place, it is possible to easily attach and remove the pedal unit. Since the corners are formed on the left and right sides of the traveling exercise bicycle, accurate manufacturing is relatively easy, and it is possible to improve assembly accuracy and ease of assembly.

  Furthermore, in the present invention, if the unit connection portion and the main body connection portion are polygonal prism shapes having a pentagonal shape to a twentieth angle in plan view, the unit connection portion and the main body connection portion are received from the left and right sides of the bicycle for driving practice according to the angle in the pentagonal shape to the twentieth angle in plan view. The strength of the pedal unit can be enhanced by an optimum structure capable of resisting stress, and twisting can be effectively prevented when an unusual stress is applied to the pedal unit.

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 related to a conventional traveling exercise bicycle and corresponding to FIG. 3.

  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 FIG. 1 and FIG. 2, the traveling practice bicycle 1 according to the present invention has a main body connection portion 21 provided below the middle stage, a saddle portion provided above the main body connection portion 21, a handle portion, The motorcycle body 2 is equipped with front wheels, rear wheels, and the like, and the pedal unit 3 is provided with a unit connection portion 34 that is detachably connected to the main body connection portion 21 of the motorcycle 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 main body connection portion 21 so that the pedal unit 3 does not interfere with both feet. On the other hand, if the unit connection part 34 is connected to the main body connection part 21 and the pedal unit 3 is attached to the two-wheeled vehicle body 2, it can be used as a normal bicycle. If the pedal unit 3 is connected to the two-wheeled vehicle body 2, a normal bicycle is obtained. Therefore, the rear wheel of the two-wheeled vehicle body 2 is provided with a wheel that meshes with a chain 5 for transmitting the driving force generated by depressing the pedal. It has been.

  As shown in FIGS. 2 and 3, the main body connection portion 21 of the two-wheel vehicle body 2 is formed in a polygonal column shape having a storage space that can be stored from the end portion 210 to the inside, for example, a columnar shape having a regular hexagonal shape in plan view. Yes. A pair of through-holes 21 a and 21 b that are penetrated by the bolts 4 are formed on the pillar surfaces, particularly on the pillar surfaces 211 and 212 on both sides in the front-rear direction, which is the traveling direction of the traveling practice bicycle 1. Further, since it has a regular hexagonal columnar shape in plan view, corners 21c are formed on the left and right sides of the traveling practice bicycle 1 in the main body connection portion 21, and the corners 21c are, for example, plastically processed, so that the strength is enhanced. ing.

  In the present invention, the shape of the main body connecting portion is not limited to a regular hexagonal columnar shape in plan view as described above, and through holes penetrating the bolts are formed on both the front and rear column surfaces that are the traveling direction of the traveling practice bicycle. If it is formed and has a polygonal column shape (a column shape of pentagon or more) in which corners are formed on at least one of the left and right sides of the bicycle for running, the problems taken up in the present application can be solved. In other words, it is possible to strengthen the strength by becoming a structure that resists the stress received from the traveling (front and rear) direction and the left and right direction of the traveling practice bicycle, and the connection work with bolts is completed at one place, the pedal unit installation, It is easy to remove, and the corners of the polygonal prism shape are formed on the left and right sides of the bicycle for practice in the main body connection part, so it is easy to manufacture with high accuracy, improve the assembly accuracy, and improve the ease of assembly. And so on.

  And as an optimal structure which can resist the stress received from the right and left direction of the bicycle for running practice and can strengthen the strength, it is possible to adopt a polygonal prism shape of about pentagonal shape to icosahedron shape in plan view. A polygonal columnar shape having a hexagonal shape to a dodecagonal shape in plan view is a more desirable form from the viewpoint of strength and ease of manufacturing. In addition, since a column shape will approximate circular shape in planar view when it exceeds a decagon, it is good to make it into a decagon or less. Further, the shape of the main body connecting portion is preferably a columnar shape of a regular polygon in plan view, such as a regular hexagon, a regular octagon, a regular dodecagon, and a regular icosahedron, from the viewpoint of ease of manufacturing.

  Further, 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 main body connecting 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 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 and the rear side of the main body connecting portion, and by taking the role of a replacement rod, the strength of the main body connecting portion itself can be improved. Even if it is the board | plate material 22 or a rod-shaped member, the reinforcement member should just be provided by welding from the two-wheel vehicle body 2 to the rear side of the main-body connection part 21, etc.

  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 unit connecting portion 34 extending perpendicularly to the pivotal shaft portion 31. Known means can be used for the two cranks 33 provided with the chain wheel 32 and the pedal 33a of the pedal unit 3.

  The unit connecting portion 34 is inserted into the storage space of the main body connecting portion 21 of the two-wheeled vehicle body 2 and can be fitted into a polygonal column shape, for example, a regular hexagonal column shape in plan view corresponding to the main body connecting portion 21. Is formed. On the column surface, in particular, on the column surfaces 341 and 342 on both sides in the front-rear direction, which is the traveling direction of the traveling practice bicycle 1, through-holes 34 a and 34 b penetrating the bolt 4 are formed as in the main body connection portion 21. Yes.

  Further, since it has a hexagonal columnar shape in plan view, like the main body connecting portion 21, corners 34c are formed on the left and right sides of the traveling practice bicycle 1 in the unit connecting portion 34. The strength is strengthened. And in the present invention, the shape of the unit connecting portion can be adopted from a polygonal prism shape of about pentagonal shape to icosahedron in plan view for the same reason as the main body connecting portion, and is flat from the viewpoint of easy manufacture. The columnar shape is preferably a regular polygon. However, naturally, the shapes of the main body connecting portion and the unit connecting portion need to match. Further, the unit connection portion may have a columnar shape such as a hollow cylindrical shape having a hollow inside as shown in FIG. 3 or a solid columnar shape filled with contents.

  In the traveling practice bicycle 1 according to the present invention, as shown in FIGS. 1 to 3, the unit connection portion 34 is inserted into the storage space of the main body connection portion 21 with the corners 21 c and 34 c and fastened with bolts 4. The main body connection unit 21 and the unit connection unit 34 are connected. Thereby, the assembly work for connecting the pedal unit 3 to the two-wheeled vehicle body 2 is completed. 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.

  When the two-wheeled vehicle body 2 and the pedal unit 3 are connected in the traveling practice bicycle 1, the unit connecting portion 34 is supported in the axial direction of the bolt 4 (the longitudinal direction that is the traveling direction of the traveling practice bicycle 1). Thereby, it becomes a structure which can resist strongly the stress which it receives from the advancing (front-back) direction of the bicycle for driving practice by the bolt 4.

  Further, as shown in FIG. 3, the main body connecting portion 21 and the unit connecting portion 34 are polygonal column shapes (polygonal column shape having a regular hexagonal shape in plan view), and the unit connecting portion 34 is square to the storage space of the main body connecting portion 21. 21c and 34c are inserted together so that the left and right corners 34c of the practice bicycle 1 at the unit connection portion 34 are supported by the left and right corners 21c of the practice bicycle 1 at the main body connection portion 21. Is done. Thereby, it becomes a structure which can also resist the stress received from the left and right sides of the bicycle 1 for running practice. In particular, the corner 21c of the main body connection portion 21 is strengthened because it is plastically processed, and can be effectively prevented from being twisted when an unusual stress is applied to the pedal unit 3.

  Thus, in the traveling practice bicycle 1 according to the present invention, the connection portion formed by the main body connecting portion 21 and the unit connecting portion 34 is twisted by strongly resisting stress from the traveling direction and the left and right directions. Can be prevented. In addition, the traveling practice bicycle 1 can be connected to the two-wheeled vehicle body 2 of the two-wheeled vehicle body 2 easily by connecting the bolt unit 4 at one place. Since the corners 21c of the main body connecting portion 21 and the corners 34c of the unit connecting portion 34 are formed on the left and right sides of the traveling practice bicycle 1, accurate manufacturing is relatively easy, improving assembly accuracy, It is also possible to improve the ease of operation.

  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 bicycle for driving 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. A configuration that can be used can be adopted. The unit connection portion may be either a hollow cylinder shape having a hollow inside or a solid column shape filled with contents. The polygonal columnar shape of the main body connecting portion and the unit connecting portion can be adopted up to a polygonal prism shape of about pentagonal shape to icosahedron shape when viewed from above, and it should be a regular polygonal shape when viewed from the viewpoint of ease of manufacturing. preferable.

1 ... Bicycle for practice practice (present invention)
2 ... Two-wheeled vehicle body 21..Main body connection part 211.Column surface 212.Column surface 21a.Through hole 21b.Through hole 21c.Square 22..Plate material (reinforcing member)
3 .... Pedal unit 31..Pivot shaft 32..Chain wheel 33..Crank 33a.Pedal 34..Unit connection part 341.Column surface 342.Column surface 34a.Through hole 34b.Through hole 34c 4 ... Bolt 5 ... Chain 10 .... Bicycle for practice (conventional)
20 .. Motorcycle body (conventional)
30 ・ Pedal unit (conventional)
40-bolts (conventional)
50 ・ ・ Cylinder (conventional)

Claims (2)

A main body connection portion having a storage space is provided in the lower middle stage, and includes a two-wheeled vehicle body on which front wheels and rear wheels are mounted, and a pedal unit having a unit connection portion that is detachably connected to the main body connection portion, In the bicycle for traveling practice that can be cultivated with the two-wheeled vehicle body and develop a sense of balance and operating technique, and the unit connecting portion is connected to the main body connecting portion, and used as a bicycle that travels with a driving force by stepping on the pedal. ,
The pedal unit includes the unit connecting portion, a pivot shaft portion extending perpendicularly to the unit connection portion, a chain wheel provided on a shaft end of the pivot shaft portion, and the pedal. With two cranks,
The unit connection portion and the main body connection portion each have surfaces on both sides in the front-rear direction, which is the traveling direction of the traveling exercise bicycle, and holes that penetrate through bolts are formed on the surfaces, and the traveling exercise bicycle. It is a polygonal prism shape having corners in the left-right direction, and the unit connection portion is inserted into the storage space of the main body connection portion while aligning the corners, and is connected by being fastened with the bolts.
This is a bicycle for practice driving. 2. The traveling practice bicycle according to claim 1, wherein the unit connection portion and the main body connection portion have a polygonal prism shape having a pentagonal shape to a twentieth angle in plan view.

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