DE102021104709A1 - Training device for isokinetic strength training - Google Patents

Abstract

The present application relates to a training device for isokinetic strength training. The training device includes a power transmission element, which can be set in motion by a movement of a user of the training device, and an electric generator, which is in operative connection with the power transmission element, so that the movement of the power transmission element causes the electric generator to rotate, causing it opposes a force to the movement of the force transmission element. In addition, the training device has at least one sensor for measuring the speed and direction of movement of the force transmission element and a controller. The electrical generator is connected to an electronic load, with the controller changing the resistance value of the electronic load and thus the force generated by the electrical generator, which opposes the movement of the force transmission element, based on the movement speed measured by the at least one sensor in such a way that the Movement speed of the power transmission element is within a predefined range. Furthermore, the present application also relates to a method for checking the resistance of a training device during isokinetic strength training.

Description

technical field

The invention relates to a training device for isokinetic strength training, in which resistance to a movement by a user of the training device is generated by means of an electrical generator. Furthermore, the invention also relates to a method for monitoring a resistance of a training device during isokinetic strength training.

State of the art

There is a wide range of strength training equipment available on the market. What these have in common is that your user performs a certain number of repetitions of a movement during a training session, with the movement taking place against a resistance that is generated by appropriate means of the training device. In this case, a part of the body is traditionally leaned against an actuating element of the training device, with the actuating element being connected to the means that generate the resistance via a force-transmitting means, for example a cable. These means can be designed, for example, as a stack of weights that are moved against the force of gravity. The resistance can usually be set individually before a training session, so that the effort required for the movement can be set for each user. However, during the training session, the resistance remains the same for each movement, which can lead to a slowing of the movement and a reduction in the distance of movement due to the increasing fatigue of the muscles of the user of the exercise machine, thus reducing the efficiency of the strength training.

During isokinetic training, the resistance is therefore dynamically changed at any time in such a way that the user can always move at a substantially constant speed and thus the maximum power of the muscle is called up at any time. The advantages of isokinetic training are the increase in strength in all angles and a lower tendency to sore muscles because there are no load peaks in the strength process.

In order to be able to carry out isokinetic training, classic training devices with weight stacks or eddy current resistance are provided with additional braking or support elements and controls, which makes the devices more expensive overall. Such devices also need a lot of space, which means that they can only be used in fitness centers or households with a large living area or basement.

Presentation of the invention

The object of the invention is to create a training device belonging to the technical field mentioned at the outset, which is of simple construction and has correspondingly small dimensions and a low price, so that isokinetic strength training is also made possible in private households.

The solution to the problem is defined by the features of claim 1. According to the invention, the training device for isokinetic strength training comprises a force transmission element, which can be set in motion by a movement of a user of the training device, and an electrical generator, which is operatively connected to the force transmission element, so that the movement of the force transmission element causes the electrical generator to Rotation is offset, whereby this opposes the movement of the power transmission element, a force. In addition, the training device has at least one sensor for measuring the speed and direction of movement of the force transmission element and a controller. The electrical generator is connected to an electronic load, with the controller changing the resistance value of the electronic load and thus the force generated by the electrical generator, which opposes the movement of the force transmission element, based on the movement speed measured by the at least one sensor in such a way that the Movement speed of the power transmission element is within a predefined range.

The training device according to the invention has a very simple structure with only a few parts, which means that it only requires a small amount of space and can be produced inexpensively. In addition, the training device is low-maintenance due to the small number of parts.

The training device can be designed to train a specific muscle group or multiple muscle groups. For this purpose, the training device preferably has at least one actuating element which can be grasped by a user or pushed or pulled using a part of the body. The at least one actuating element is connected to the force transmission element, so that the user of the training device can move the force transmission element by moving the actuating element. The actuating element is preferably connected directly to the force transmission element. Alternatively, however, the actuating element can also be connected indirectly to the force-transmitting element via a further element, such as a connecting cable.

The training device preferably has at least one guide with which the movement of the force transmission element is restricted in at least one specific direction, so that a user of the training device can only perform a guided training movement with the force transmission element. This at least one guide includes, for example, a deflection roller or guide rail.

The training device is preferably a strength training device. Alternatively, however, the training device can also be a cardio training device, for example an ergometer or similar.

The movement of the force transmission element can be linear or circular. The power transmission element is preferably flexible. Alternatively, however, the force transmission element can also be rigid.

The generator is preferably a rotating generator with a rotor and a stator. Electrical voltage is induced in the conductors or conductor windings of the stator by the Lorentz force due to the circulating DC magnetic field generated by the rotor with a permanent magnet or an electromagnet.

The power transmission element and the generator preferably have complementary elements in order to enable power transmission between the power transmission element and the rotor of the electric generator. As a result, the electric generator can be rotated by the movement of the power transmission element.

The electronic load acts as a current sink that consumes the electric power generated by the rotation of the electric generator. The electrical power is preferably converted into heat in the electronic load.

The resistance value of the electronic load can be set within a specific range by the controller. The resistance created by the electronic load is applied to the voltage of the electric generator. The variable resistance of the electronic load allows the flow of current through the conductor windings of the electrical generator to be varied so that a variable force is opposed to the rotation of the rotor of the electrical generator. Since the power transmission element interacts with the electric generator, this force also opposes the movement of the power transmission element. This means that a user of the training device has to exert a force that is opposite to this force in order to move the force transmission element, with which the training effect is ultimately achieved.

The at least one sensor is preferably an optical, electrical or magnetic sensor. The speed of movement and the direction of movement of the force transmission element are measured with the at least one sensor.

The controller preferably has a microprocessor and a non-volatile memory. The controller is preferably arranged in a housing and has a connection for a power supply. Furthermore, the controller is connected to the electronic load and to the at least one sensor. The predefined area is preferably stored in the controller. The controller preferably has input means, for example buttons or a touch screen, with which the predefined area can be changed or entered by a user of the training device.

The controller preferably has a module for wireless communication, in particular a Bluetooth®, NFC or Wifi module based on the IEEE 802.11 standard. This allows the controller to read out user-specific data, in particular data relating to the predefined area, from a mobile device of a user of the training device, for example from a mobile phone or fitness bracelet, or from a chip which is arranged, for example, on a card or in a key fob.

If the movement speed of the force transmission element measured by the at least one sensor exceeds or falls below the predefined range, the controller changes the resistance value of the electronic load by increasing or decreasing it. The increase or decrease in the resistance value is carried out until the speed of movement of the force transmission element is again within the predefined range. This dynamic change in the resistance value enables isokinetic training with the training device according to the invention.

The training device preferably has a basic element on which at least the controller, the electric generator and the electronic load are arranged. This base element preferably has bores with which the base element can be attached, in particular to a wall, wall, ceiling, floor, door frame or other training device.

The electrical generator, the electronic load and the controller are preferably arranged in a housing which protects these components of the training device from external influences and damage. The housing has appropriate openings or holes so that the power transmission element can protrude through it.

The controller preferably has display means, for example a display unit or a screen, on which data can be displayed to a user of the training unit, in particular data on the measured movement speed and direction or the predefined area.

The force transmission element is preferably guided in such a way that it can be moved back and forth linearly, with the force transmission element being moved during the outward movement by the user from a basic position in a first direction over a first distance and then in a second direction, that of the first Direction is opposite, can be moved back to the home position.

The electric generator is preferably an electric motor. The electric motor is preferably a compact electric motor with small dimensions. The electric motor is preferably a DC motor or alternatively a three-phase motor.

As is known to a person skilled in the art, any electric motor can be used as an electric generator and vice versa. A commercially available electric motor can therefore be used as an electric generator in the training device according to the invention, which considerably reduces the costs for production and repair of the training device.

The electric motor is preferably a brushless DC motor with sensor-controlled commutation using Hall sensors, the Hall sensors of the electric motor also being used as sensors for measuring the speed and direction of movement of the power transmission element.

Since the power transmission element interacts with the electric generator—which is designed as a brushless DC motor in this embodiment—the rotational speed and direction of rotation of the DC motor can be used to measure the speed and direction of movement of the power transmission element.

By using the Hall sensors present in the DC motor to measure the speed and direction of movement, the number of parts required to produce the training device can be further reduced.

Preferably, the controller is further configured to calculate the first distance when the user moves the force transmission element in the first direction based on the movement speed and the duration of this movement, and to rotate the electric motor when the movement of the force transmission element in the first direction is complete to move to move the power transmission element in the second direction back to the basic position.

The controller preferably calculates the duration and rotational speed of the electric motor that are necessary to move the force transmission element back into the basic position.

In this embodiment, the force transmission element is actively moved by a user of the training device only in the first direction, while the movement in the second direction back to the basic position takes place passively for the user, since this is done by the electric motor.

Alternatively, however, the movement back into the basic position can also take place actively by a movement by the user or passively for the user by a spring element which is tensioned by the movement in the first direction.

The controller is preferably designed in such a way that during a first movement of the force transmission element within a training session in the first direction, it calculates an average speed of the force transmission element based on the measured speed of movement and the duration of the movement, with the controller also being designed in such a way that this is calculated for each subsequent Movement of the power transmission element in the first direction changes the resistance value of the electronic load in proportion to the deviation when the measured speed of movement deviates from the average speed by more than a predetermined difference value.

Thus, in this embodiment, the predefined range is defined by the average ge speed determined during the first movement of the power transmission element in the first direction within a training session and the predetermined difference value.

A training unit preferably comprises a large number of trains, ie repetitions of a movement of one or more body parts, for example the legs or arms, the movement being suitable for training one or more muscle groups. Typically, a training session consists of 5 to 50 moves, especially 10 to 20 moves. In one go, the force transmission element is moved by the user using muscle power first in the first direction from the basic position by the first distance against the force generated by the electric generator and then back to the basic position.

The predetermined differential value can preferably be changed by the user of the training device via the controller, for example by input means of the controller.

The power transmission element is preferably at least one cable, a chain or a belt, in particular a V-belt. If the power transmission element is a rope, it can be a wire rope or a rope made of synthetic or natural fibers. A wire rope which has a sheath made of a polymer is particularly preferably used as the rope.

The electric motor is preferably an external rotor motor, the rotor of which forms a roller, with the at least one cable, the at least one chain or the at least one belt being stretched around the roller around at least part of its circumference, but preferably being wound at least once around its circumference .

The at least one cable, the at least one chain or the at least one belt is preferably wound onto the roll. As a result, the power transmission element does not have a free end that lies or hangs around freely in the training device. This can improve the visual appearance of the exercise machine and reduce the risk of injury from entanglement.

The electronic load preferably has a DC-DC converter and at least one high-capacity capacitor to convert and smooth the voltage of the current generated by the generator, so that in particular the generated electric current can be stored in an accumulator or used to operate a device can.

The electronic load preferably has an inverter in order to feed the current generated by the generator into a power grid.

The present application also relates to a method for checking a resistance of a training device during isokinetic strength training, in a first step the movement speed and the direction of movement of a force transmission element of the training device, which is operatively connected to an electrical generator, is measured with at least one sensor. wherein the electric generator counteracts the movement of the force transmission element with a force. In a further step, the resistance value of an electronic load that is connected to the electrical generator is changed by a controller if the speed of movement of the force transmission element measured by the at least one sensor is outside a predefined range.

The method is particularly preferably carried out using a training device as described above.

Preferably, during a first movement of the force transmission element within a training session in a first direction, an average speed of the force transmission element is calculated by the controller based on the measured movement speed and the duration of the movement, with each further movement of the force transmission element in the first direction if there is a deviation in the measured movement speed from the average speed by more than a predetermined difference value, the resistance value of the electronic load is varied by the controller in proportion to the deviation.

Further advantageous embodiments and combinations of features of the invention result from the following detailed description and the entirety of the patent claims.

Brief description of the drawings

• 1 eine schematische Seitenansicht einer Ausführungsform eines erfindungsgemässen Trainingsgeräts; und
• 2 ein schematischer Ablauf einer bevorzugten Ausführungsform eines erfindungsgemässen Verfahrens.

The drawings used to explain the embodiment show:

• 1 a schematic side view of an embodiment of a training device according to the invention; and
• 2 a schematic sequence of a preferred embodiment of a method according to the invention.

In principle, the same parts are provided with the same reference symbols in the figures.

Ways to carry out the invention

the 1 shows a schematic side view of an embodiment of a training device 1 according to the invention. The training device 1 comprises a force transmission element 2, which is designed as a cable in the embodiment shown. At one end, the power transmission element 2 has a handle bar 3 which can be gripped by a user of the training device 1 . The user can use the handle bar 3 to move the power transmission element 2 in a linear back and forth movement in order to exercise, the power transmission element 2 being guided over a deflection roller 4 in the embodiment shown. The power transmission element 2 is operatively connected to an electrical generator 5 . The electric generator 5 is arranged in a housing 7, the housing 7 having an opening through which the power transmission element 2 is guided. In the embodiment of the training device 1 shown, the electric generator 5 is designed as an electric motor, the rotor 6 of which is configured as an external rotor. The power transmission element 2 designed as a cable is wound onto the rotor 6 of the electrical generator 5 . The training device 1 also includes a controller 8, a sensor 10, with which the speed and direction of movement of the power transmission element 2 can be measured, and an electronic load 9. The sensor 10 and the electronic load 9 are connected to the controller 8. The electronic load 9 is also connected to the electrical generator 5 . A variable resistance value for the current generated by the movement of the force transmission element 2 by the electric generator 5 is generated with the electronic load 9 . This resistance opposes the rotation of the rotor 6 of the electric generator 5 with a force. As a result, the movement of the force-transmitting element 2 operatively connected to the rotor 6 is also counteracted by a resistance. This resistance ultimately achieves the training effect for a user using the training device 1 . The controller 8 is designed in such a way that it changes the resistance value of the electronic load 9 in such a way that the speed of movement of the power transmission element 2 is always within a predetermined range. If the moving speed of the power transmission member 2 is too low, the controller 8 decreases the resistance value of the electronic load 9. Accordingly, the controller 8 increases the resistance value of the electronic load 9 when the moving speed of the power transmission member 2 is too high. This means that the force which opposes the movement of the force transmission element 2 is varied in such a way that the force transmission element always moves at a speed which lies within the predefined range.

In the embodiment shown, the training device 1 preferably has a base element 11 in the form of a plate which can be fastened to a wall or masonry, for example, with appropriate fastening means such as screws or bolts.

the 2 shows a schematic representation of an embodiment of the method 30 according to the invention for a training device 1, for example according to FIG 1 . After the training device 1 or the controller 8 is switched on by a user of the training device 1, the controller 8 monitors in an initial step 31 by means of the at least one sensor 10 whether the force transmission element 2 is set in motion. This is the case when the user begins a training session in which he uses the handlebar 3 to move the power transmission element 2 out of a basic position against the resistance of the electrical generator 5, initially in a first direction over a first distance and then back into the basic position moved back. During this first train 40 of the training unit, in a first step 32 during the movement of the force transmission element 2 in the first direction, the sensor 10 measures the movement speed of the force transmission element 2 and the movement duration in the first direction, and from this an average speed of the force transmission element is calculated by the controller 8 calculated. The distance by which the force transmission element 2 was moved can be determined on the basis of the average movement speed and the duration of the movement in the first direction. The end of the first movement in the first direction is detected by a reversal of the speed of movement.

After this first move 40, the training unit includes further moves 50 in which the same movements are carried out by the user. This means that with each additional train 50 in the training session, the user moves the power transmission element 2 against the resistance of the electric generator 5 from the basic position, first in the first direction and then in the second direction back to the basic position.

After by the at least one sensor 10 a renewed reversal of the direction of movement of the force transmission element 2 in a first th detection step 33 is detected, the speed of movement of the force transmission element 2 in the first direction and the duration of the movement are then determined in a second step 34 of the method 30 . In a comparison step 35, the controller 8 compares the speed of movement determined in the further train 50 with the average speed of movement in the first train 40. If the speed of movement determined is lower by a predetermined differential value than the average speed of movement of the force transmission element 2 of the first train 40, the controller 8 reduces the Resistance value of the electronic load. If the determined speed of movement of the further train 50 is greater than the average speed of movement of the first train 40 by a predetermined differential value, the controller 8 increases the resistance value of the electronic load 9.

In a second detection step 36 the reversal of the movement direction of the force transmission element 2 is measured by the at least one sensor 10 . After reversing the direction of rotation twice, a new next move 50 of the training unit begins. If only the direction of movement is reversed, then the training unit and thus the method have reached the end 37 .

During the training session, the user of the training device 1 is preferably shown data on the determined average movement speed of the first train 40 and the determined movement speed of the other trains 50 on a display unit.

Reference List

1

training device

2

power transmission element

3

handle bar

4

pulley

5

electric generator

6

rotor

7

Housing

8th

steering

9

electronic load

10

sensor

11

basic element

30

procedure

31

initial step

32

First step

33

First detection step

34

Second step

35

comparison step

36

Second detection step

37

End

Claims (12)

Training device for isokinetic strength training comprising a force transmission element, which can be set in motion by a movement of a user of the training device, an electrical generator, which is in operative connection with the force transmission element, so that the movement of the force transmission element causes the electrical generator to rotate, whereby this counteracts the movement of the force transmission element with a force, at least one sensor for measuring the speed and direction of movement of the force transmission element and a controller, characterized in that the electrical generator is connected to an electronic load, the controller measuring the resistance value of the electronic load and thus the The force generated by the electrical generator, which opposes the movement of the force transmission element, based on the movement speed measured by the at least one sensor such ve indicates that the speed of movement of the power transmission element is within a predefined range. training device according to claim 1 , characterized in that the force transmission element is guided in such a way that it can be moved back and forth linearly, with the force transmission element during the outward movement by the user from a basic position in a first direction over a first distance and then in a second direction , which is opposite to the first direction, can be moved back to the basic position. training device according to claim 2 characterized in that the electric generator is an electric motor. training equipment according to claim 3 , characterized in that the electric motor is a brushless DC motor with sensor-controlled commutation using Hall sensors, the Hall sensors of the electric motor being used at the same time as sensors for measuring the speed and direction of movement of the power transmission element. training device according to claim 3 or 4 , characterized in that the controller is further configured to calculate the first distance when the user moves the force transmission element in the first direction based on the movement speed and the duration of this movement and to calculate the first distance when the movement of the force transmission element in the first direction is complete To set electric motor in rotation to move the power transmission element in the second direction back to the basic position. Training device according to one of claims 2 until 5 , characterized in that the controller is designed in such a way that, during a first movement of the force transmission element within a training session in the first direction, it calculates an average speed of the force transmission element on the basis of the measured speed of movement and the duration of the movement, the controller also being designed in such a way that with each further movement of the force transmission element in the first direction, if the measured movement speed deviates from the average speed by more than a predetermined differential value, this changes the resistance value of the electronic load in proportion to the deviation. Training device according to one of Claims 1 until 6 , characterized in that the power transmission element is at least one cable, a chain or a belt, in particular a V-belt. training device according to claim 7 , characterized in that the electric motor is an external rotor motor, the rotor of which forms a roller, the at least one rope, the at least one chain or the at least one belt being stretched around the roller at least over part of its circumference, but preferably at least once around whose circumference is wrapped. Training device according to one of Claims 1 until 8th , characterized in that the electronic load has a DC-DC converter and at least one high-capacity capacitor in order to convert and smooth the voltage of the current generated by the generator, so that in particular the generated electric current is stored in an accumulator or used to operate a device can be used. training device according to claim 9 , characterized in that the electronic load has an inverter to feed the electricity generated by the generator into a power grid. Method for checking a resistance of a training device, in particular according to one of Claims 1 until 10 , during isokinetic strength training, comprising the following steps: a) measuring the movement speed and the direction of movement of a force transmission element of the training device, which is operatively connected to an electrical generator, with at least one sensor, the electrical generator counteracting the movement of the force transmission element with a force; b) Changing a resistance value of an electronic load, which is connected to the electric generator, by a controller if the speed of movement of the force transmission element measured by the at least one sensor is outside a predefined range. procedure according to claim 11 , characterized in that during a first movement of the force transmission element within a training session in a first direction based on the measured movement speed and the duration of the movement, an average speed of the force transmission element is calculated by the controller, with each further movement of the force transmission element in the first direction at a If the measured speed of movement deviates from the average speed by more than a predetermined difference value, the resistance value of the electronic load is changed by the controller in proportion to the deviation.

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