JPH0715492U - Children's tricycle drive - Google Patents

Abstract

(57) [Summary] [Purpose] To make the drive shaft free from rotation of the front wheels in the forward direction. [Structure] An outer wheel 9 is attached to an inner wheel 6 rotatably attached to a drive shaft 1 so as to be synchronized with forward rotation and to be forwardly rotated and free to be rotated backward. The outer wheel 9 is fixed to a front wheel 11. Then, a fixed arm 13 having a movable arm 15 flexibly connected to the tip of the drive shaft 1 is projected in the diameter direction, and the fixed arm 13 is brought into contact with one end surface of the inner wheel 6 by the forward and backward rotation of the drive shaft 1. The front and rear diversion propulsion pieces 16 and 17 are arranged at an appropriate interval, and a guide 18 for bending the movable arm 15 is provided between the rear diversion propulsion piece 17 and a retractable space 19 for the movable arm 15. , Appearance distance 1 on the outer wheel 9
That is, the abutting body 21 is formed on which the movable arm 15 projecting from 9 and in the extended state collides.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive device that is attached to a front wheel of a child's tricycle and that moves the tricycle forward or backward by rotating a pedal or makes the tricycle free.

[0002]

2. Description of the Related Art Generally, in a three-wheeled vehicle for children, a crank is directly attached to a drive shaft of a front wheel, so that the rotation speed of the pedal of the crank and the rotation speed of the front wheel are the same. On the contrary, even if the wheel rotates, the rotation of the same rotation speed as the rotation of the wheel is transmitted to the crank, that is, the pedal.

[0003] Therefore, the pedal rotates even when the guardian pushes the tricycle back, so that there is a disadvantage that the foot placed on the pedal simultaneously moves up and down with the rotation of the wheel regardless of the will of the child. It will put an unexpected burden on the child.

[0004] Therefore, in the related art, a method of joining and separating the rotation of the pedal and the drive shaft of the front wheel by the operation of picking has been considered, and when joined, there is no difference from the conventional tricycle for children. When the children could play and separated, the pedals on which the child's feet were placed became completely free from forward and backward movements, allowing the parents to easily push and change directions.

However, in this method, if the child is in the separated state, not only cannot the child immediately respond to the forward / reverse movement operation, but also the brake operation by depressing the pedal becomes impossible. Had the inconvenience of having to constantly hold a tricycle, and there was a possibility that it would sometimes be extremely dangerous when going downhill, for example.

[0006]

[Problems to be solved by the invention] The problem to be solved is that the pedal of the conventional children's tricycle is directly connected to the drive shaft of the front wheel, and the pedal is not in a free state. However, with the joining / separation method, which can be completely free in both forward and backward movements, a great deal of trouble and great risk are involved.

[0007]

[Means for Solving the Problems]

 According to the present invention, pedals are attached to both ends via crankshafts, a drive shaft is rotatably supported at the lower end of the handle frame, an inner wheel rotatably attached to the drive shaft, and its outer periphery. Attached to the outer wheel, which rotates in synchronism with the forward rotation of the inner wheel and is free from backward rotation, the front wheel attachment piece that is formed on the outer periphery of the outer wheel, and the drive shaft. Of the fixed arm, which is connected to the distal end of the movable arm in a bendable manner, and a stopper that is provided on the fixed arm or the movable arm and that prevents the movable arm from excessively sharp bending. Between the front-rear propulsion piece, which is disposed on one end surface of the inner wheel at an appropriate interval and the side surface of the fixed arm abuts by the front-rear rotation of the drive shaft, and the outer end portion of the rear-revolution propulsion piece. Arranged with the movable arm appearing and leaving intervals, A guide that keeps the moving arm bent in the direction of the rearward-moving propulsion piece, and an abutting piece that collides with the movable arm that is formed on the outer wheel attachment piece or the front wheel and that is extended from the retracted interval. It consists of.

In addition, the fixed arm may be provided with a spring that elastically presses the movable arm in the bending direction.

[0009]

[Action]

 Then, the inner and outer wheels are rotatably inserted through the drive shaft, and the fixed arm with the movable arm bent in the direction of the rearward propulsion piece is positioned between the front and rear rearward propulsion pieces. The outer wheel is rotatably supported, the outer wheel mounting piece is fixed to the front wheel, the inner and outer wheels are mounted, and the pedals are mounted on both ends of the drive shaft via the crankshaft.

The relationship between the inner wheel and the outer wheel is that when the inner wheel is rotated forward, the outer wheel also rotates forward in synchronization, and when the pedal is stepped forward, the drive shaft rotates and the fixed arm moves forward. At the same time as the inner wheel is rotated by being brought into contact with the diversion propulsion piece, the outer wheel meshed with the inner wheel is also rotated, and the front wheel is driven forward. At this time, the movable arm comes into contact with the guide and is bent in the direction of the rearward-moving propulsion piece, but the movable arm is prevented from being bent at an excessively sharp angle by the stopper.

Next, if the forward movement of the pedal is stopped while the fixed arm is in contact with the forward drive propulsion piece, when the guardian pushes the tricycle, the front wheel is rotated along with the rotation of the front wheel. The outer wheel also rotates, but even if the fixed arm is in contact with the forward drive propulsion piece, no forward propulsion force is applied to the pedal, so the inner wheel moves forward of the front wheel. The rotation is not transmitted and the inner and outer wheels are free to rotate with respect to each other, so that the guardian can easily push the tricycle.

When the pedal is depressed in the reverse direction, since there is some resistance between the inner and outer wheels, the drive shaft, which is rotatable with respect to the inner and outer wheels, rotates backward independently and the movable arm moves. Will move in a bent state, but the tip of the movable arm will collide with the rearward propelling piece to change direction, and finally the tip of the movable arm will protrude from the retracted interval, while the fixed arm will move backward. It comes into contact with the diversion propulsion piece and is in a state in which the rearward rotation can be transmitted to the inner wheel. At this time, the movable arm is extended with respect to the fixed arm.

In this extended state, when the pedal is depressed in the backward direction, that is, when the inner wheel continues to rotate rearward, the movable arm protruding from the retracted interval is formed on the outer wheel attachment piece or the front wheel. It collides with the abutment body and transmits the rotational force to the outer wheels or the front wheels to drive the front wheels in the rearward direction. At this time, in the movable arm that collides with the abutting body, the connecting portion with the fixed arm is brought into contact with the rearward propulsion piece, and the opposite side surface is brought into contact with the end portion of the guide to maintain the extended state, The rearward drive of the front wheels continues.

When the movable arm collides with the abutting body, that is, when the front wheels are moved backward, the pedal on which the child's foot is put is moved in the forward direction by slightly retracting the tricycle. The front wheels will immediately rotate freely forward in the forward direction.

Further, since the fixed arm is provided with the spring that elastically presses the movable arm in the bending direction, the movable arm can always be in contact with the stopper, so that the bending operation of the movable arm by the guide can be performed. It is possible to provide more reliable assistance.

[0016]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 is a drive shaft rotatably supported by a lower end of a handle frame 2, and pedals 5 are attached to both ends thereof via crankshafts 4. ing.

Reference numeral 6 denotes an inner wheel rotatably attached to the drive shaft 1, and an engaging pawl 8 elastically pressed outward by a spring 7 is provided at a proper position on the outer periphery of the inner wheel. An outer wheel 9 is rotatably attached to the outer periphery of the inner wheel 6, and forms a pawl gear 10 with which the engaging pawl 8 meshes, and a front wheel 11 is fixed to the outer periphery of the outer wheel. The mounting piece 12 is formed to project.

Reference numeral 13 denotes a fixed arm projecting in the diametrical direction of the drive shaft 1, and a movable arm 15 having a spring 14 that elastically presses in the bending direction is connected to the tip of the fixed arm in a bendable manner. Front and rear turning propulsion pieces 16 and 17 in which the side surface of the fixed arm 13 is brought into contact with the inner side surface due to the front and rear rotation of the drive shaft 1 are arranged in a V-shape at appropriate intervals.

Reference numeral 18 denotes a guide projecting from the outer end portion of the rearward-traveling propulsion piece 17 at a protruding / retracting interval 19 of the movable arm 15 to indicate a state in which the movable arm 15 is bent toward the rearward-rotation propulsion piece 17. However, the movable arm 15 is provided with a stopper 20 that prevents excessively sharp bending of the fixed arm 13.

Reference numeral 21 denotes an abutment formed on the attachment piece 12 of the outer wheel 9, and the movable arm 15 projecting from the retracting interval 19 and in the extended state collides with the front wheel 11 to transmit the rearward rotation.

In the embodiment shown in the drawings, engaging pawls 8 are provided at appropriate positions on the outer circumference of the inner wheel 6, and a pawl gear 10 with which the engaging pawls 8 mesh with the inner peripheral surface is formed on the outer circumference of the inner wheel 6. Although the outer wheel 9 is rotatably attached, there is no technical difference even if the engaging pawl 8 and the pawl gear 10 are formed at mutually opposite positions, and the abutment body 21 is in front. Even if it is formed on the wheel 11, there is no particular difference in action and effect.

Further, although the stopper 20 formed on the movable arm 15 is shown as an example, the movable arm 15 is prevented from being bent excessively at an acute angle with respect to the fixed arm 13, and the movement of the fixed arm 13 is hindered. If the position is not present, for example, it may be formed on one end surface of the inner wheel 6 adjacent to the rear-wheeling propulsion piece 17, or may be formed on the fixed arm 13 facing the movable arm 15. is there.

[0023]

[Effect of device]

 The present invention is configured as described above, and it is possible to easily perform not only forward operation but also reverse operation as usual, and if the pedal is stopped in the forward direction and the state is maintained, the drive shaft and front wheel are Is in a free state and can be easily pushed or changed direction by the guardian, and since there is no transmission of rotation to the pedals, it does not burden the playing child. It can return to normal forward / backward operation immediately, which is extremely safe.

Further, by providing the fixed arm with a spring for elastically pressing the movable arm in the bending direction, the bending state of the movable arm with respect to the fixed arm is assisted, and the bending operation of the movable arm by the guide is made more reliable. Can be done.

[Brief description of drawings]

FIG. 1 is a front view with a partial cross section.

FIG. 2 is an exploded perspective view of a main part.

FIG. 3 is an explanatory diagram showing a forward movement state and a free state.

FIG. 4 is an explanatory diagram showing a reverse drive state.

[Explanation of symbols]

 1 Drive Shaft 2 Handle Frame 3 Shaft Support 4 Crank Shaft 5 Pedal 6 Inner Wheel 9 Outer Wheel 11 Front Wheel 12 Mounting Piece 13 Fixed Arm 14 Spring 15 Movable Arm 16 Forward Rolling Propulsion Piece 17 Rearward Rolling Propulsion Piece 18 Guide 19 Residing Interval 20 Stopper 21 Abutment

Claims (2)

[Scope of utility model registration request] 1. A drive shaft (1) having pedals (5) attached to both ends via a crank shaft (4) and rotatably supported on a lower end of a handle frame (2), and a drive shaft (1). An inner wheel (6) rotatably attached to the shaft (1), and an outer wheel (6) attached to the outer periphery of the inner wheel (6) that rotates in synchronism with the forward rotation of the inner wheel (6) and is free from backward rotation ( 9) and a piece (12) for attaching to the front wheel (11) which is formed on the outer circumference of the outer wheel (9).
And a fixed arm (13) projecting in the diametrical direction of the drive shaft (1) and having a movable arm (15) flexibly connected to the distal end thereof, and the fixed arm (13) or the movable arm (15), A stopper (20) for preventing the movable arm (15) from being bent excessively at an acute angle with respect to the fixed arm (13) and an inner wheel (6) at one end face thereof with an appropriate interval, and a drive shaft ( A movable arm (15) is provided between the forward-backward driving propulsion pieces (16) (17) with which the side surface of the fixed arm (13) is brought into contact by the forward-backward rotation of 1) and the outer end portion of the rearward-motion propulsion piece (17). The guides (1) which are arranged at intervals of appearing and disappearing (19) and which make the movable arm (15) bent in the direction of the rearward propulsion piece (17).
8) and the mounting piece (12) of the outer wheel (9) or the front wheel (11), the abutment body (15) colliding with the movable arm (15) that is extended from the retracting interval (19) and is in an extended state. 21) A drive device for a tricycle for children, which comprises 2. The drive device for a tricycle for children according to claim 1, wherein the fixed arm (13) is provided with a spring (14) for elastically pressing the movable arm (15) in a bending direction.