JPS628756A - Limb extending and contracting motion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lower limb extension exerciser that can perform flexion and extension movements of both legs independently, alternately between the left and right, or both left and right together.

[Conventional technology]

Lower limb extension exercise 2S1 shown in Fig. 5 used for strengthening physical strength and training for functional recovery of post-surgery patients, physically disabled people, etc.
In this example, a trainee who takes a sitting posture throws both legs forward, fixes the feet to pedals 2g and 2f that can freely reciprocate in the front and back direction, and repeats bending and stretching movements. The structure is such that a load such as 4r provides exercise resistance to the muscles.

[Problem that the invention seeks to solve]

In the above-mentioned conventional lower limb extension exerciser 1, the effect of muscle strength during general joint movement is smallest in the flexed position (at the start of extension).
It has a mountain-shaped characteristic that reaches its maximum at an intermediate angle and decreases again at an extended position.
), therefore, if the weight load is set to be suitable for the flexed position, the load will be under-loaded at other angles, and if the weight load is set to be suitable for the intermediate angle where muscle strength is maximum, the load will be overloaded at other angles. There was a problem in that it was not possible to apply an optimal load to the entire range of motion of the joint, causing strain. In addition, in response to a weight load, both legs were extended at the same time, one leg at a time, and it was not possible to alternately exercise the pedals, such as extending the right foot pedal and flexing the left foot pedal, or vice versa. There were problems such as the inability to train alternating movements or to train patients with hemiplegia.

[Means for solving problems]

This invention solves the above-mentioned problems, and includes a pair of left and right chains that are stretched in a reciprocating manner over the range of bending and stretching of both legs when sitting in a sitting position, and a pair of chains that are connected to these pairs of chains to move the left and right legs. A speed-limiting load device that applies a load when the pedal to be locked and the pair of sprockets to which each of the chains is stretched reaches a predetermined speed, and a speed-limiting load device that is interposed between the pair of sprockets and The gist of this is that it is comprised of a gear mechanism that restricts both sprockets to rotate in opposite directions.

[Effect]

In this invention, a pedal fixed to a chain stretched between sprockets is reciprocated by bending and extending both legs, and uniform velocity training is performed during extension, and a gear mechanism interposed between left and right sprockets allows To regulate both sprockets to have a reverse rotation relationship.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 to 3 are a plan view, a side view, and a plan view of essential parts, respectively, showing an embodiment of the lower limb extension exerciser of the present invention.

In FIG. 1.2, the lower limb extension exerciser 11 has a configuration in which a cam clutch 13 matches the load produced by a speed-limiting @-type load device 12 that limits the speed of exercise and the trainee's leg strength. The trainee lowers his or her hips on the chair 14, throws both legs forward, and places the left and right feet on the pedals 15/15r. The pedals isg and isr are arranged between a pair of sprockets L61 and 16 provided in the bending and stretching range of both legs, respectively.
It is connected to a chain 17 that is stretched between r and reciprocates back and forth along a pair of guide rails 171 and 17r that are parallel to the chain 17 by bending and stretching the legs.

The left and right sprockets) 16jl' and L6r are attached to each output shaft 13a of the cam clutch 13 on both sides of the gear mechanism 18, as shown in FIG. The rotational power of the load device 12 is transmitted to the pulley 19 provided at the right end of the belt hook 13b by transmission. The cam clutch 13 is connected to the output shaft 1
3a is in a connected state when it is synchronized with the input shaft 13b in the normal rotation direction, and gears 201.20r are fixed to the ends of both output shafts 13a. A gear 221 meshes with the gear 20g via a small-diameter gear 21, and a gear 22r meshes with the other gear 20r. The gear 22g and the gear 22r are on the same axis, and the gear 221 can be moved between the engagement position and the disengagement position on the axis n by a shift lever 24 that is operated according to the movement form. can.

The load device 12 is a speed-limiting type that rotates at a predetermined speed, and when the output shaft 12a attempts to rotate beyond that speed, the output shaft 12a functions to suppress rotation exceeding the predetermined speed. The trainee receives resistance as a reaction force.

Here, when the gear 221 is shifted to the detached position by operating the shift lever, the left and right gears 20/, 20r can rotate independently of each other. Therefore, the trainee can bend and stretch the left and right legs separately or simultaneously by connecting the pedals 151 and 15r. In this case, if the normal rotational speed of the output shaft 13a of the cam clutch 13 is smaller than the rotational speed of the input shaft 13b, the cam clutch 13 is in a slipping state, and the normal rotational speed of the output shaft 13a is lower than the rotational speed of the input shaft 13b. 13 When it catches up with the rotational speed of b,
The output shaft 13a and the input shaft 13b rotate together. Therefore, even if an attempt is made to move the left and right legs at a speed higher than a certain speed, the rotation of the output shaft 13a does not increase any further, and as a result, the leg on the kicking side performs a uniform extension motion.

On the other hand, when the gear 22j is shifted to the meshing position by operating the shift lever 24, the left and right gears 201.degree.2Or will rotate synchronously in opposite directions.

Therefore, by moving the left and right legs alternately, the trainee can
Pedal 1! M! , 15r can be moved alternately. That is, when the left leg is extended forward, the right leg is bent, and when the right leg is extended forward, the left leg is bent.

Therefore, the exercise in this case is an exercise in which the left leg and right leg alternately bend and stretch. That is, in the case of this example, resistance training is performed at a constant speed throughout the entire range of motion of both legs, so-called iso-kinetic exercise.
), and as a result, even if the muscle movement at a certain angle is weakened due to a disability or the like, it is possible to apply a load that is suitable for the correct angle.

In this way, the lower limb extension exerciser 1 is a sprocket)
Pedals 151 and 15r connected to a chain 17 stretched between 161 and 16r are reciprocated by bending and stretching both legs, and uniform velocity training is performed during extension. Both sprockets 161 #1
Since the structure is configured such that 6r can be regulated in a reverse rotational relationship, the movement form of both legs can be selected such as left and right alternately or left and right independently, depending on whether the gear mechanism 18 is activated or not. Furthermore, since the rotation of both sprockets 161 and 16r is configured to be loaded by the load device 12 of the speed limiter when it reaches a predetermined speed, uniform velocity (based on one practice) is achieved. It is possible to achieve the fruits of muscular strength enhancement and functional recovery that are difficult to obtain from isotonic training or isotonic training.

In the above embodiment, the gear mechanism 18 was constructed using five gears 206, zor, 21.22J, and '22r, but as in gear mechanism 4 shown in FIG. 4, a pair of bevel gears 306, 301 In addition to fixing the bevel gears 30g and 3Or, a bevel gear 31 that can be freely engaged and disengaged may be provided, and the bevel gear 31 may be switched between the engaged state and the disengaged state by a shift lever 32 that is operated according to the movement form. good. When the bevel gears 31 are engaged, the left and right pedals 161. L6r moves alternately, and when the bevel gear 31 is disengaged, the left and right pedals 161 and 16r can move freely.

Furthermore, in the above embodiment, by providing a braking means at the shaft end of the input shaft 13a, isotonic training becomes possible.

Furthermore, the lower limb extension exerciser 11 can be used not only horizontally, but also with an appropriate inclination from horizontal to vertical.

In addition, in the above embodiment, as shown by the dotted line in FIG.
A semiconductor strain sensor 50 may be attached to the pedals 15g and 15r, and the leg extension force may be displayed on a display device (not shown).

〔Effect of the invention〕

As explained above, according to the present invention, the pedal connected to the chain stretched between the sprockets is reciprocated by bending and stretching both legs, and uniform velocity training is performed during extension, and the pedal is connected to the chain stretched between the sprockets. Since the gear mechanism interposed between the two sprockets is configured to be able to restrict rotation in opposite directions, depending on whether the gear mechanism is activated or not,
The motion form of both legs can be selected to alternate left and right or left and right independently, and a speed-limiting load device applies a load to the rotation of both sprockets when a predetermined speed is reached. Because it has a structure that gives strength, it is based on isokinetic training and increases muscle strength that is difficult to obtain from isoattribute training or isotonic training.

The benefits of functional recovery can be cited, and are not limited to the medical field.
It has excellent effects, such as being applicable to training in the field of sports.

[Brief explanation of drawings]

1 to 3 are a plan view, a side view, and a plan view of essential parts, respectively, showing an embodiment of the lower limb extension exerciser of the present invention;
FIG. 4 is a plan view of a main part showing a modified example of a lower limb extension exerciser according to the present invention, and FIG. 5 is a side view showing an example of a conventional lower limb extension exerciser.

Claims (1)

[Claims] A pair of left and right chains tensioned so as to be reciprocally movable in the range of bending and stretching of both legs in a sitting posture, a pedal connected to each pair of chains to lock the left and right feet, and a pair of chains to which each of the chains is stretched. A speed limiting type load device that applies a load when the sprocket reaches a predetermined speed, and a gear mechanism that is interposed between the pair of sprockets and restricts both sprockets to rotate in opposite directions when activated. A lower limb extension motor.