JPH06190078A - Resistance adder for indoor gymnastic apparatus - Google Patents

Abstract

PURPOSE:To provide a resistance adder for an indoor gymnastic apparatus which is so arranged to change a load linearly with respect to the movement of a knob f or adjusting the load to facilitate the adjustment of the load. CONSTITUTION:A resistance adder has a rotating shaft 16 which rotates with the operation of turning a pedal and a metal rotary plate 24 is fixed on the rotating shaft 16. A pair of eddy current generation members are counterposed sandwiching the rotary plate 24 while a plurality of permanent magnets 28 and 32 are arranged in a ring continuously so as to differentiate the polarity thereof alternately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an exercise which is installed on a floor surface to support a rear wheel of a bicycle and allows a user to rotate a pedal so that an effect similar to that of an actual bicycle race can be obtained. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an instrument, and more particularly, to a device for imparting load resistance to a pedal.

[0002]

2. Description of the Related Art On the floor, exercise equipment is commercially available which supports the rear wheels of a bicycle and allows a user to rotate a pedal to obtain the same effect as in an actual bicycle race. This exercise equipment is equipped with a device that applies load resistance to the rear wheel according to the rotational speed of the rear wheel of the bicycle. The exerciser can increase or decrease the load resistance of the load applying device according to his physical strength and physical condition.

Conventionally, as a load applying device, one using a fan whose air resistance increases and decreases according to the rotation speed is known. However, when this load applying device is used, the air is agitated as the fan rotates, which causes large noise and dust.

As another load applying device, there has been proposed a brake device which automatically adjusts frictional resistance due to contact between a disc provided on a shaft driven by a rear wheel of a bicycle and a brake applying member. ing. In this brake device, since frictional resistance due to contact is used as a load, the contact portion is worn and the load resistance is reduced. Therefore, there is a lack of accuracy in automatically adjusting the load. further,
It was necessary to replace the worn load means at an early stage, and maintenance work was extremely complicated.

In order to solve such a problem, exercise equipment provided with a magnetic load applying device has been proposed. As shown in FIG. 8, in this load applying device, a metallic rotating plate 60 is fixed to one end of a rotating shaft that supports a bicycle, and a pair of discs 61 that face each other with the rotating plate 60 interposed therebetween have a predetermined interval. A group of permanent magnets 62 arranged in an annular shape is arranged. Then, the magnetic flux from the facing magnet 62 and the rotating plate 60
Eddy current is generated by the rotational movement of. The load generated on the rotary plate 60 by this eddy current is transmitted to the rear wheel of the bicycle via the rotary shaft 63. The load is adjusted by rotating the permanent magnet 62 by adjusting the knob and changing the amount of magnetic flux that generates an eddy current. According to this magnetic load applying device, the load can be obtained in a non-contact manner, so that the noise is small. In addition, there is no wear and maintenance is easy. Further, the load can be easily adjusted.

[0006]

However, in the above load applying device, since the circular magnets are arranged at a predetermined interval, the group of circular permanent magnets arranged on one side of the rotary plate and the rotary plate. It is possible that one magnet group opposes the other permanent magnet group without being aligned with the circular permanent magnet group on the opposite side. The change in the amount of magnetic flux at this time is not linear, and the amount of magnetic flux changes non-linearly as shown in FIG. 9 with respect to the rotational movement amount of the knob. Therefore, the change of the magnetic flux is large and the change of the load is large with respect to a small movement of the load adjusting knob. Also, due to the non-linear characteristics, it is not easy to adjust to the load desired by the driver.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and its object is to make the load linear with respect to the movement of the load adjusting knob. Another object of the present invention is to provide a resistance imparting device for indoor exercise equipment that changes easily and easily.

[0008]

In order to achieve the above object, in the first aspect of the invention, a rotary shaft which is rotated by a rotary operation of a pedal, and a metal rotary shaft which is fixed to the rotary shaft. A plate and a pair of eddy current generating members, which are arranged to face each other with the rotary plate sandwiched therebetween, and in which a plurality of permanent magnets are continuously arranged in an annular shape so that the polarities are alternately different, are provided. It is a summary.

According to the second aspect of the invention, the rotary shaft which is rotated by the rotary operation of the pedal, the metal rotary plate fixed to the rotary shaft, and the rotary plate which are arranged to face each other with the rotary plate interposed therebetween are rotated. In a resistance imparting device for an indoor exercise equipment provided with an eddy current generating member for generating an eddy current when the plate rotates, the eddy current generating member is provided with a load that changes substantially linearly with respect to the rotating plate by the eddy current. The main point is that it is composed of a fan-shaped permanent magnet group to be added.

[0010]

With the above structure, the rotary shaft is rotated in accordance with the rotary operation of the pedal, and the metal rotary plate fixed to the rotary shaft is rotated. Then, an eddy current is generated by a pair of eddy current generating members that are arranged to face each other with the rotary plate interposed therebetween,
A linearly varying load is applied to the pedal.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, first and second leg portions 1 and 2 are erected on the left and right of a bicycle exercise stand so as to be slightly inclined, and both leg portions 1 and 2 extend horizontally at their lower ends. They are connected by a first horizontal support tube 3. At the upper end of the first leg 1, a cylinder 4 extending horizontally is provided.
Is formed, and the screw rod 5 is screwed therein. The holding body 6 attached to the inner end of the screw rod 5 is adjusted in position by operating a knob 7. And second
A cylinder 8 extending in the horizontal direction is also formed at the upper end of the leg portion 2, and a slider 9 is fitted into the cylinder 8. The outer end of the slider 9 and the pedal 10 are operatively connected via a lever 11. And with the stepping operation of the pedal 10,
The slider 9 moves in the cylinder 8 in the horizontal direction by the crank movement of the lever 11, and adjusts the position of the holding body 12 attached to the inner end thereof.

The upper ends of the two leg parts 1 and 2 are rotatably attached to the upper ends of U-shaped auxiliary leg parts 13 which are inclined corresponding to these. A second horizontal support pipe 14 is fixed to the lower end of the auxiliary leg portion 13.

A resistance applying device 15 is fixed on the first support tube 3. Then, as shown in FIG. 2, after the rear wheel 51 of the bicycle 50 is placed on the resistance applying device 15, both holders 6 and 12 are positionally adjusted to hold the hub of the rear wheel 51 irremovably. Thus, the exercise preparation posture of the bicycle 50 is completed.

Now, the resistance applying device will be described with reference to FIGS. 3 and 4. The rotating shaft 16 is rotatably supported by the main body 18 via a pair of bearings 17. Rotating shaft 16
The drive cylinder 19 is fitted in the central portion of the vehicle, and the rear wheel 51 of the bicycle 50 is in contact with the outer peripheral surface thereof. The drive cylinder 19 is rotated by the rotation of the rear wheel 51 associated with the rotation operation of the pedal 52 of the bicycle 50.

A flange 20 is fitted and fixed to one end of the rotary shaft 16. A flywheel 21 that gives inertia to the pedal 52 via the rotary shaft 16 when an exerciser rotates the pedal is attached to the flange 20 with a screw 20a. The flywheel 21 is made of an iron plate, and a plurality of sheets (up to three sheets in this embodiment) can be attached. The exerciser can adjust the number of flywheels 21 according to his physical strength. As described above, by attaching the desired number of flywheels 21 to the rotary shaft 16, the usability of the exercise equipment can be approximated to that of an actual bicycle.

Further, a substantially bowl-shaped inner case 22 is attached to the main body 18 so as to cover the flywheel 21,
A substantially bowl-shaped outer case 23 that covers the flywheel 21 from the other side is attached to its open end. Then, by removing the outer case 23 from the inner case 22, the flywheel 21 is replaced.

At the other end of the rotary shaft 16, a metal rotary plate 24 is provided.
Are fitted and fixed via a bush 25. Rotating plate 2
A substantially bowl-shaped inner case 26 is fixed to the side surface of the main body 18 so as to cover 4 from one side, and the rotating plate 24 is provided at the open end thereof.
A substantially bowl-shaped outer case 27 that covers the other side is attached.

A plurality of fixed permanent magnets 28 in the shape of an arc are attached to the inner surface of the inner case 26 adjacent to the rotary plate 24 via attachment plates 29. As shown in FIG. 4, the permanent magnets 28 are continuously arranged on the same circumference of the mounting plate 29 in alternating polarities.

A plurality of heat dissipation holes 24a arranged in the circumferential direction are formed on the inner peripheral portion of the rotary plate 24, and the rotary plate 2 rotates.
4. Prevents extreme heat rise. As shown in FIG. 3, a support plate 30 is rotatably supported on the inner surface of the outer case 27, and is retained and held by a plurality of support legs 31 provided on the outer case 27. A plurality of arcuate movable permanent magnets 32 having a circular arc shape are continuously provided on the support plate 30 in a state of being close to the rotary plate 24 and facing the fixed permanent magnets 28 so that the polarities are alternately different on the same circumference. It is arranged. Each movable permanent magnet 32 is adapted to generate an eddy current on the rotary plate 24 in cooperation with the fixed permanent magnet 28 when the rotary plate 24 rotates. Due to this eddy current, a rotation resistance is generated in the rotary plate 24, and a load is applied to the pedal 52 of the bicycle 50.

As shown in FIG. 5, an adjusting knob 33 for adjusting the load applied to the pedal 52 is attached to the center of the outer surface of the outer case 27. As shown in FIG. 3, the knob 33 is rotatably attached to the case 27 via a pin 34 and is fixed to the inner surface of the connecting plate 3.
It is connected to the support plate 30 via a plurality of connecting pieces 36 on the upper part 5. An index 37 is provided on the outer surface at one end of the adjusting knob 33.
A scale 38 is provided on the outer surface of the outer case 27 corresponding to the index 37 to indicate the adjustment position of the load applied to the rotary plate 24, that is, the pedal 52.

When the index 37 is at the position indicating "L" on the scale 38, it indicates a low load. In this state, the movable permanent magnet 32 and the fixed permanent magnet 28 are arranged so that the polarities of the end faces facing each other are matched. On the other hand, when the index 37 is at the position indicating "H" on the scale 38, it indicates a high load. In this state, the movable permanent magnet 32
The fixed permanent magnets 28 are arranged so as to face each other and have different polarities. By rotating the knob 33 between “H” and “L” of the scale 38, the pedal 52
The value of the load on the can be adjusted. As shown in FIG. 3, engagement balls 39 and springs 40 are provided on the outer surface of the outer case 27. By the action of the spring 40, the ball 39 is selectively engaged with the plurality of engaging holes 41 provided on the connecting plate 35, and the movable permanent magnet 32 is adjusted to the desired adjustment indicated by the index 37. Held in position.

Next, the operation of the indoor exercise equipment constructed as described above will be described. In this indoor exercise equipment, when the pedal 52 of the bicycle 50 is rotationally operated, the driving force of the rear wheel 51 is transmitted to the rotary shaft 16 via the drive cylinder 19. With the rotation of the rotary shaft 16, the flywheel 21 and the rotary plate 24 at both ends are integrally rotated. At this time,
An eddy current is generated on the rotary plate 24 by the permanent magnet groups 28 and 32 arranged with the rotary plate 24 interposed therebetween, and resistance is imparted to the rotation. Therefore, a load is applied to the rotation operation of the pedal 52. Rotational resistance of the pedal 52 is controlled by operating the adjusting knob 33 so that the fixed and movable permanent magnets 28,
It is adjustable by changing the facing positional relationship of 32.

More specifically, at the "L" position of the scale 38 shown in FIG. 6A, the movable permanent magnet 32 is located.
Are arranged so that the same poles face each other with respect to the fixed permanent magnet 28, so that the magnetic flux passing through the rotary plate 24 is almost zero. Eddy current is magnetic flux and rotating plate 24
Is generated by the rotational movement of the rotary plate 24, and a load is generated in a direction that hinders the rotation of the rotary plate 24. Therefore, if the magnetic flux is zero, no eddy current is generated and no load is generated. On the other hand, FIG.
In the “H” position of the graduation 38 shown in (c), the movable permanent magnet 32 is arranged with the different poles facing each other with respect to the fixed permanent magnet 28, so that the magnetic flux increases. Then the load increases. The position of the movable permanent magnet 32 with respect to the fixed permanent magnet 28 is the circumferential direction from the state where the same poles face each other, and the intermediate state between “H” and “L” of the scale 38 shown in FIG. 6B. , Are continuously displaced to the opposite states of different polarities. Then, the magnetic flux increases linearly,
The eddy current also increases linearly. Therefore, the adjustment knob 3
The load changes linearly as shown in FIG.

As described above, in the resistance imparting device of this embodiment, the load changes linearly with the amount of rotation of the adjusting knob 33, so it is desirable to rotate the adjusting knob 33 according to the scale 38. Adjustments to the load can be made easily.

The present invention is not limited to the configuration of the above-described embodiment. For example, the permanent magnets 28 and 32 arranged on the circumference may be circular permanent magnets instead of arc-shaped permanent magnets. It is also possible to embody it by arbitrarily changing it within a range that does not depart from the spirit of the present invention, such as arranging continuously in a ring shape without breaks.

[0026]

According to the present invention, since the permanent magnets are continuously arranged in an annular shape, the load changes linearly with respect to the amount of rotation of the adjusting knob, and it is easy to adjust to a desired load. There is an effect that can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a resistance imparting device for exercise equipment embodying the present invention.

FIG. 2 is a front view showing a state in which a bicycle is set on exercise equipment.

FIG. 3 is a vertical cross-sectional view of a resistance applying device.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 showing the arrangement of permanent magnets.

FIG. 5 is a front view showing an adjustment knob of the resistance applying device.

FIG. 6A is an explanatory diagram showing a state of magnetic flux of the rotating plate at a position where the index indicates “L” on the scale. (B) It is explanatory drawing which shows the state of the magnetic flux of a rotating plate in the position which an index | index indicates the intermediate | middle of "L" and "H" of a scale. (C) It is explanatory drawing which shows the state of the magnetic flux of a rotating plate in the position which an index | index indicates "H" of a scale.

FIG. 7 is a characteristic diagram showing a relationship between a knob rotation amount and a load applied to a pedal.

FIG. 8 is a cross-sectional view showing a state where permanent magnets are arranged in a conventional example.

FIG. 9 is a characteristic diagram showing a relationship between a knob rotation amount and a load applied to a pedal in a conventional example.

[Explanation of symbols]

16 rotating shaft, 24 rotating plate, 28 fixed permanent magnet constituting eddy current generating member, 29 mounting plate constituting eddy current generating member, 30 supporting plate constituting eddy current generating member, 32 constituting eddy current generating member Movable permanent magnet, 52 pedals.

Claims (2)

[Claims] 1. A rotary shaft which is rotated in accordance with a rotary operation of a pedal, a metal rotary plate fixed to the rotary shaft, and a plurality of permanent magnets arranged to face each other with the rotary plate interposed therebetween. A resistance imparting device for an indoor exercise tool, comprising: a pair of eddy current generating members continuously arranged in a ring so that the polarities are alternately different. 2. A rotary shaft that is rotated according to a rotary operation of a pedal, a metal rotary plate fixed to the rotary shaft, and a rotary plate that are opposed to each other with the rotary plate interposed therebetween, and an eddy current is generated when the rotary plate rotates. In a resistance imparting device for indoor exercise equipment provided with an eddy current generating member for generating a eddy current, the eddy current generating member is provided with a fan-shaped permanent magnet for applying a load that changes substantially linearly to the rotating plate by the eddy current. A resistance imparting device for an indoor exercise equipment, which is configured by a magnet group.