JP5897198B1 - Tricycle - Google Patents

Abstract

An object of the present invention is to provide a three-wheeled bicycle that is excellent in stability, can speed up, can be installed on a bicycle parking machine without requiring a large installation space. A three-wheel bicycle A includes a front wheel 1 and two inclined rear wheels 2 inclined inwardly toward the upper part, and a front frame 3 to which the front wheel 1 is rotatably attached; It has a rear frame 4 to which two inclined rear wheels 2 are rotatably attached, and a main frame 5 connected to the front frame 3 and the rear frame 4. By sequentially depressing the pedal 14 with the left and right feet of the rider, the lever bar 13 rotates about an angle of about 45 degrees with the support shaft 13a as a fulcrum, thereby rotating the crank 16 via the connecting bar 17. Accordingly, the gear 15 is rotated, and the inclined rear wheel 2 is rotated via the chain 18. [Selection] Figure 1

Description

  The present invention relates to a three-wheeled bicycle, and more particularly to a three-wheeled bicycle provided with an inclined rear wheel in which two rear wheels are inclined inward toward the upper part.

  In general, for elderly people, bicycles are a convenient vehicle that expands the range of action, but elderly people have weak legs and weakness in balance and grip strength, so they may fluctuate or fall over while riding. In addition, because the field of view narrows, the response to cars and pedestrians may be delayed. For this reason, accidents caused by two-wheeled bicycles on which elderly people ride have occurred frequently, which has become a major social problem.

  Conventionally, as a two-wheeled bicycle for elderly people, a bicycle that is easy to ride and has a frame and saddle set low so that both feet firmly touch the ground has been selected (hereinafter, this technology is referred to as Conventional Example 1).

  In addition, since it is easy to ride on a row or climb uphill, electric assist bicycles are widely used by elderly people (hereinafter, this technique is referred to as Conventional Example 2).

Further, Patent Document 1 proposes an automatic tricycle including inclined rear wheels that incline the left and right rear wheels at the rear of the vehicle body inward in order to prevent the vehicle from falling (hereinafter, this technique is referred to as Conventional Example 3). ).
JP 2010-36877 A

  In the conventional example 1 and the conventional example 2, the balance of the vehicle body is maintained only at the two points of the front wheel and the rear wheel, and the exercise is performed by rotating the pedal with the foot placed on the pedal. However, there is a problem in that it is not stable because it takes a lot of labor and burden, and it may fluctuate or fall over.

  Conventional Example 3 has a problem that it is difficult to increase speed because the width between the inclined rear wheels is wide. In addition, since a large installation space is required, there is a problem that it is difficult to install the bicycle in a bicycle parking lot or the like in a bicycle storage area.

  The present invention has been made to solve the above-described problems, and provides a three-wheeled bicycle that is excellent in stability, capable of speeding up, does not require a large installation space, and can be installed in a bicycle parking machine. With the goal.

The three-wheeled bicycle of the present invention is a three-wheeled bicycle comprising one front wheel and two inclined rear wheels inclined inward toward the upper part,
A front frame on which the front wheel is rotatably mounted;
A rear frame on which the two inclined rear wheels are rotatably mounted;
A main frame coupled to the front frame and the rear frame;
A lever bar that is pivotally attached to the front side of the main frame and has a pedal attached to the rear end;
A gear rotatably mounted with a gear shaft provided on the rear side of the main frame as a fulcrum;
A crank attached to the gear shaft;
A connecting bar connected between the pedal and the crank and rotatably mounted;
A chain that connects the rear hub attached to the inclined rear wheel and the gear and transmits the rotational force of the gear to the inclined rear wheel via the rear hub;
By rotating the lever bar, the crank is rotated via the connecting bar, the gear is rotated accordingly, and the inclined rear wheel is rotated via the chain.
It is characterized by this.

  The support shaft attached to the rear hub and the axle of the inclined rear wheel may be coupled in a state bent at a predetermined angle.

  The support shaft and the axle may be coupled by a pressing spring attached to each.

The push spring may be configured by alternately arranging a right-handed spring and a left-handed spring.
The distance between the lower parts of the inclined rear wheels is preferably about 300 mm.

  The present invention has the following effects.

  (1) Since one front wheel and two inclined rear wheels inclined inward toward the upper part are provided, the vehicle body is stabilized and can be prevented from falling.

  (2) Since it is possible to drive only by depressing the pedal, not by rotating the pedal with the feet of the rider, for elderly people who have the power to straddle, they can drive without much effort and lighten the burden, A more stable tricycle can be provided.

  (3) By setting the distance between the lower parts of the tilted rear wheels to about 300 mm, it is possible to increase the speed, and because it does not require a large installation space, it can also be installed on bicycle parking machines etc. in the bicycle storage area. Become.

1 is a side view schematically showing a tricycle according to an embodiment of the present invention. 1 is a plan sectional view schematically showing a front portion of a tricycle according to an embodiment of the present invention. It is explanatory drawing for demonstrating operation | movement of the three-wheeled bicycle which concerns on the example of embodiment of this invention. (A) is a rear view showing an inclined rear wheel of a three-wheel bicycle according to an embodiment of the present invention, (B) is a detailed view of an S portion of (A), and (C) is a perspective view showing a right-handed push spring. (D) is a perspective view showing a left-handed push spring.

  Embodiments of the present invention will be described below. FIG. 1 is a side view schematically showing a tricycle according to an embodiment of the present invention, FIG. 2 is a plan sectional view schematically showing a front portion of the tricycle according to an embodiment of the present invention, and FIG. FIG. 4A is a rear view showing an inclined rear wheel of the three-wheel bicycle according to the embodiment of the present invention, and FIG. 4B is an explanatory diagram for explaining the operation of the three-wheel bicycle according to the embodiment of the invention. (C) is a perspective view showing a right-handed push spring, and (D) is a perspective view showing a left-hand push spring.

  As shown in FIGS. 1, 2 and 4, the three-wheeled bicycle A according to the embodiment of the present invention includes one front wheel 1 and two inclined rear wheels 2 inclined inward toward the upper part. A front frame 3 to which the front wheel 1 is rotatably attached, a rear frame 4 to which two inclined rear wheels 2 are rotatably attached, and a main frame connected to the front frame 3 and the rear frame 4 And 5.

  A head pipe 6 is connected to the front end portion of the front frame 3, and a handle portion 7 is attached to the upper portion of the head pipe 6.

  A base end portion of the front frame 3 is connected to a front hub 8 that rotatably supports the front wheel 1.

  A vertical pipe 9 is erected on the upper part of the middle portion of the main frame 5, and a saddle 10 is attached to the upper part of the vertical pipe 9.

  The front frame 3 and the vertical pipe 9 are connected by a horizontal pipe 11.

  The front end portion of the rear frame 4 is connected to the rear portion of the vertical pipe 9, and the base end portion is connected to a rear hub 12 that rotatably supports the inclined rear wheel 2.

  On the front side of the main frame 5, two lever bars 13 are provided on the left and right sides, respectively, which are rotatably attached with a support shaft 13 a as a fulcrum and a pedal 14 is attached to the rear end.

  A gear 15 is attached to the rear side of the main frame 5 so as to be rotatable about the gear shaft 15a. The gear 15 is arranged behind the normal bicycle.

  Two cranks 16 are provided on the left and right sides of the gear shaft 15a of the gear 15, respectively.

  A connecting bar 17 is rotatably mounted between the pedal 14 and the crank 16.

  A chain 18 that transmits the rotational force of the gear 15 to the inclined rear wheel 2 via the rear hub 12 is attached between the rear hub 12 attached to the inclined rear wheel 2 and the gear 15.

  In addition, 19 is a mudguard part for front wheels, and 20 is a mudguard part for rear wheels.

  As shown in FIG. 3, by stepping on the pedals 14 with the left and right feet of the rider in sequence, the left and right lever bars 13 rotate about an angle of about 45 degrees with the support shaft 13a as a fulcrum. The crank 16 is rotated via the connecting bar 17, the gear 15 is rotated accordingly, and the inclined rear wheel 2 is rotated via the chain 18.

  As shown in FIG. 4, the inclined rear wheels 2 provided on the left and right sides are arranged so that the distance between the lower parts is about 300 mm and the distance between the upper parts is about 100 mm, so that they taper upward. It is inclined at an angle of about 80 degrees.

  The support shaft 12a attached to the rear hub 12 and the axle 2a of the inclined rear wheel 2 are connected in a state of being bent at a predetermined angle (about 10 degrees).

  The support shaft 12a and the axle 2a are connected to each other by a push spring 21 attached by brazing or the like (see FIG. 4B).

  The push spring 21 is configured by alternately arranging a right-handed push spring 21a shown in FIG. 4C and a left-hand push spring 21b shown in FIG. 4D (see FIG. 4B). ). As a result, the urging forces of the right-handed push spring 21a and the left-handed push spring 21b are alternately applied from the forward and reverse directions, and the support shaft 12a attached to the rear hub 12 and the axle 2a of the inclined rear wheel 2 are more It can be firmly connected.

  According to the three-wheeled bicycle according to the embodiment of the present invention, since the vehicle includes the one front wheel 1 and the two inclined rear wheels 2 inclined inwardly toward the upper part, the vehicle body is stabilized and the vehicle falls over. Can be prevented.

  In addition, since it can be driven only by depressing the pedal 14 instead of rotating the pedal 14 with the feet of the rider, it can be driven without requiring much labor for the elderly who have the power to straddle, and the burden is reduced. A more stable tricycle can be provided.

  Furthermore, by setting the distance between the lower part of the inclined rear wheel 2 to about 300 mm, it becomes possible to increase the speed, and because it does not require a large installation space, it can be installed in a bicycle parking machine etc. in a bicycle storage area. Become.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical matters described in the claims.

  The tricycle of the present invention is mainly used for elderly people.

A: Three-wheel bicycle 1: Front wheel 2: Inclined rear wheel 3: Front frame 4: Rear frame 5: Main frame 6: Head pipe 7: Handle part 8: Front hub 9: Vertical pipe 10: Saddle 11: Horizontal pipe 12: Rear hub 13: insulator bar 14: pedal 15: gear 16: crank 17: connecting bar 18: chain 19: front wheel mudguard 20: rear wheel mudguard 21: push spring

Claims (3)

A three-wheeled bicycle having one front wheel and two inclined rear wheels inclined inward toward the upper part,
A front frame on which the front wheel is rotatably mounted;
A rear frame on which the two inclined rear wheels are rotatably mounted;
A main frame coupled to the front frame and the rear frame;
A lever bar that is pivotally attached to the front side of the main frame and has a pedal attached to the rear end;
A gear rotatably mounted with a gear shaft provided on the rear side of the main frame as a fulcrum;
A crank attached to the gear shaft;
A connecting bar connected between the pedal and the crank and rotatably mounted;
A chain that connects the rear hub attached to the inclined rear wheel and the gear and transmits the rotational force of the gear to the inclined rear wheel via the rear hub;
By rotating the lever bar, the crank is rotated through the connection bar, the gear is rotated accordingly, the inclined rear wheel is rotated through the chain,
The supporting shaft attached to the rear hub and the axle of the inclined rear wheel are connected by a pressing spring attached to each of them,
The push spring is configured by alternately arranging a winding portion of a right-handed spring and a winding portion of a left-handed spring in the axial direction.
A tricycle characterized by that.   The three-wheeled bicycle according to claim 1, wherein a support shaft attached to the rear hub and an axle of the inclined rear wheel are connected in a state bent at a predetermined angle. The three-wheeled bicycle according to claim 1 or 2, wherein a distance between lower portions of the inclined rear wheels is about 300 mm.