JPH0226977B2 - - Google Patents

Description

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

[Conventional technology]

The lower limb extension exerciser 1 shown in Fig. 5, which is used for strengthening physical strength and training for functional recovery of post-surgical patients and physically disabled people, is used by a trainee who takes a sitting position, throws both legs forward, and moves forward and backward. The feet are fixed to reciprocably movable pedals 2l, 2r, and are repeatedly bent and stretched, and at this time, the load of vertical weights 4l, 4r, etc. connected to the pedals by wires 3 provides exercise resistance to the muscles.

[Problems to be Solved by the Invention] In the above-mentioned conventional lower limb extension exerciser 1, the action of muscle strength during general joint movement is limited to the flexed position (at the start of extension).
It has the characteristic of a mountain shape that it is smallest at the middle angle, becomes largest at the middle angle, and becomes smaller again at the extended position, whereas it is an isotonic exercise using weights 4l, 4r, etc. If the weight load is set to be suitable for the flexed position, the load will be too low at other angles, and if the weight load is set to be suitable for the intermediate angle where muscle strength is maximized, it will be overloaded at other angles, causing strain. There was a problem in that it was not possible to apply an optimal load to the entire joint range of motion. 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 to allow reciprocating movement in the range of bending and stretching of both legs in a sitting posture, and a chain that is connected to these pairs of chains to lock the left and right legs. a speed-limiting type load that is connected to the pair of sprockets through a cam clutch, and applies a load when the pair of sprockets reaches a predetermined speed. The gist of this invention is that it is comprised of a gear mechanism, which is interposed between the pair of sprockets, and which restricts both sprockets to rotate in opposite directions when in operation.

[Effect]

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

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Figures 1 to 3
The figures 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 FIGS. 1 and 2, the lower limb extension exerciser 11 is configured so that a cam clutch 13 matches the load produced by a speed-limiting type loading device 12 that limits the speed of exercise and the leg strength of the trainee. The trainee is on chair 1
4, throw both legs forward, and lock the left and right feet on the pedals 15l and 15r. The pedals 15l and 15r are connected to a chain 17 stretched between a pair of sprockets 16l and 16r, respectively, which are provided in the bending and stretching range of both legs, and a pair of guide rails 17l parallel to the chain 17 are connected by the bending and stretching movements of the legs. , 17r.

The left and right sprockets 16l and 16r are connected to the cam clutch 1 on both sides of the gear mechanism 18, as shown in FIG.
The input shaft 13 is attached to each output shaft 13a of 3 and passes through the output shaft 13a of both cam clutches 13.
The rotational power of the load device 12 is transmitted to the pulley 19 provided at the right end portion of b by belt transmission.
The cam clutch 13 is connected when the output shaft 13a is synchronized with the input shaft 13b in the normal rotation direction, and a gear 20 is provided at the end of both output shafts 13a.
1 and 20r are fixed. A gear 22l meshes with the gear 20l via a small-diameter gear 21, and a gear 22r meshes with the other gear 20r. The gear 22l and the gear 22r are connected to the same shaft 2.
The gear 22l can be moved on the shaft 23 between an engaged position and a disengaged position by a shift lever 24 operated according to the movement mode.

The load device 12 is of a speed-limiting type, in which the output shaft 12a 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 experiences resistance as a reaction force.

Here, operate the shift lever 24 to shift the gear 22
When l is shifted to the release position, the left and right gears 20
l and 20r can now rotate independently of each other. Therefore, the trainee can bend and stretch the left and right legs separately or simultaneously by connecting the pedals 15l and 15r. In this case, if the normal rotation speed of the output shaft 13a of the cam clutch 13 is smaller than the rotation speed of the input shaft 13b, the cam clutch 13 is in a slipping state, and the normal rotation speed of the output shaft 13a is equal to the rotation speed of the input shaft 13b. When the output shaft 13a and input shaft 13b catch up, 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 22l is shifted to the meshing position by operating the shift lever 24, the left and right gears 2
0l and 20r rotate synchronously in opposite directions. Therefore, by alternately moving the left and right legs, the trainee can alternately reciprocate the pedals 15l and 15r. 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 one in which the left leg and right leg are alternately extended and extended. That is, in the case of this example, resistance training at a constant speed over the entire range of motion of both legs, so-called iso-kinetic exercise, is performed.
This makes it possible to apply a correctly adapted load even if muscle movement at a certain angle is weakened due to a disability or the like.

In this way, the lower limb extension exerciser 11 has the pedals 15l and 15r connected to the chain 17 stretched between the sprockets 16l and 16r.
Make them reciprocate by bending and extending both legs, perform uniform velocity training when extending, and adjust the left and right sprocket 1.
Since the gear mechanism 18 interposed between 6l and 16r is configured so that both sprockets 16l and 16r can be regulated in a reverse rotational relationship, depending on whether the gear mechanism 18 is activated or not, the motion form of both legs can be changed alternately between left and right. Alternatively, the left and right sides can be selected independently. Furthermore, both sprockets 16l, 1
6r rotation, the speed-limiting type loading device 12 is configured to apply a load when a predetermined speed is reached, so that it can be used for isometric training and isotonic training based on isokinetic training. You can see the hard-to-obtain fruits of muscle strength building and functional recovery.

In addition, in the above embodiment, the gear mechanism 18 has five
gears 20l, 20r, 21, 22l, 22r
Although the gear mechanism 28 shown in FIG.
A pair of bevel gears 30l and 30r are fixed together as shown in FIG.
1 may be switched to an engaged state or a disengaged state. When the bevel gear 31 is engaged, the left and right pedals 15l and 15r move alternately, and the bevel gear 3
If 1 is removed, the left and right pedals 15l and 15r
will be able to move freely.

Furthermore, in the above embodiment, by providing a braking means at the shaft end of the input shaft 13b, isotonic training becomes possible. Furthermore, the lower limb extension exerciser 11
It is possible not only to install it horizontally, but also to use it with an appropriate inclination from horizontal to vertical.

Further, in the above embodiment, as shown by the dotted line in FIG. 2, semiconductor strain sensors 50 may be attached to the pedals 15l 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 the extension, and the pedal is connected to the chain stretched between the sprockets. Since the structure is such that both sprockets can be regulated in a reverse rotational relationship by a gear mechanism interposed in Furthermore, since the rotation of both sprockets is configured to be loaded by a speed-limiting load device when a predetermined speed is reached, based on uniform velocity training,
Strengthening muscle strength, which is difficult to obtain from isometric training or isotonic training,
It can bring about the fruits of functional recovery, and has excellent effects that can be applied not only to the medical field but also to training in the sports field.

[Brief explanation of drawings]

1 to 3 are a plan view, a side view, and a plan view of essential parts showing an embodiment of the lower limb extension exerciser of the present invention, and FIG. 4 is a modified example of the lower limb extension exerciser of the present invention. FIG. 5 is a side view showing an example of a conventional lower limb extension exerciser. 11... Lower limb extension exerciser, 12... Loading device, 13
...Cam clutch, 15l, 15r...Pedal, 16
l, 16r...Sprocket, 17...Chain, 1
8, 28... Gear mechanism, 24, 32... Shift lever.

Claims (1)

[Claims] 1. A pair of left and right chains that are tensioned in a reciprocating range over the range of bending and stretching of both legs in a sitting posture, a pair of pedals that are connected to these pairs of chains and lock the left and right feet, and a pair of chains that are tensioned with each of the chains. sprockets, a speed limiting type load device which is connected to the pair of sprockets via a cam clutch and applies a load when the pair of sprockets reaches a predetermined speed, and which is interposed between the pair of sprockets and operates. A lower limb extension exerciser comprising a gear mechanism that regulates both sprockets to rotate in opposite directions.