JPH04126165A - Training machine - Google Patents

Abstract

PURPOSE:To calculate and display the muscular power curve from only a pressure sensor by calculating a damper operating speed and working force from detected hydraulic pressure of a hydraulic damper, calculating a stroke by integrating the speed, and displaying a muscular power characteristic curve calculated, based on the working force and the stroke. CONSTITUTION:In the training machine provided with a member 50 to be moved for moving by a transfer of external force, and a hydraulic damper 51 for giving moving resistance force of this member to be moved, a means 52 for detecting generated hydraulic pressure of the hydraulic damper 51, a means 53 for calculating a damper operating speed from this detected hydraulic pressure, a means 54 for calculating working force from the detected hydraulic pressure in the same way, a means 55 for calculating a stroke by integrating a speed, and a means 56 for displaying a muscular power characteristic curve calculated, based on the working force and the stroke are provided. As for the hydraulic damper, generated attenuation force becomes high in accordance with an operating speed, and there is a prescribed correlation between them. Accordingly, by measuring the pressure, the working force and the damper speed are calculated, and based thereon, the stroke amount is also derived.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a training machine having a function of displaying measured muscle strength characteristics.

(Conventional technology) As a training machine used for physical strength training,
Some use hydraulic dampers.

For example, the one shown in FIG. 5 is a training machine used for training to increase leg strength, in which a hydraulic damper 3 is connected to a driven lever 2 that is moved by a trainee sitting on a seat 1 using leg strength.

When the leg force applied to the driven lever 2 is increased, the driven lever 2 moves against the hydraulic damper 3, but when the leg force is weakened, the restoring force of the hydraulic tamper 3 causes the driven lever 2 to return to its original position.

At this time, a pressure sensor 5 detects the pressure of the hydraulic damper 3 in order to measure and display the strength of the leg force applied to the driven lever 2.
, a potentiometer 6 that detects the stroke amount, and an encoder 7 that detects the rotation angle of the driven lever 2. Based on these input signals, a computer 8
However, a muscular strength characteristic curve is calculated based on the relationship between the stroke of moving the driven lever 2 and its counterforce, and this is displayed in real time on the screen of the display device 9 through graph processing.

In this case, the acting force (muscle strength) can be measured from the output of the pressure sensor 5, and the stroke can be measured from the output of the potentiometer 6, but the correspondence between the output value of the pressure sensor 5 and the actual muscle strength depends on the rotation angle of the driven lever 2. Since the relationship changes and the stroke correspondence also changes, these are corrected based on the rotation angle of the driven lever 2 detected by the encoder 7.

(Problem to be Solved by the Invention) However, this device has a pressure sensor 5 that detects the pressure generated by the hydraulic damper 3, a potentiometer 6 that detects the stroke, and an encoder 7 that detects the rotation angle of the driven lever 2. must be installed on the training machine,
The configuration of the detection unit becomes complicated, and there are also problems in terms of cost.

An object of the present invention is to provide a training machine that solves the above-mentioned problems by focusing on the pressure and speed characteristics of a hydraulic damper, and by making it possible to calculate and display a muscle strength curve only from a pressure sensor. shall be.

(Means for Solving the Problems) As shown in FIG. 1, the present invention provides a training machine that includes a driven member 50 that moves by transmission of an external force, and a hydraulic damper 51 that applies a movement resistance force to the driven member. , means 52 for detecting the JIE oil pressure of the hydraulic damper 51;
A means 53 for calculating the damper operating speed from the detected oil pressure, a means 54 for calculating the acting force from the detected oil pressure, a means 55 for calculating the stroke by integrating the speed, and a means 55 for calculating the stroke by integrating the speed. and means 56 for displaying the muscle strength characteristic curve.

(Function) The damping force generated by a hydraulic damper increases depending on the operating speed, and there is a certain correlation between these forces. Therefore, by measuring the pressure, the acting force and damper speed can be calculated.
Based on this, the stroke amount can also be determined. Muscle strength characteristics are calculated and displayed from the acting force and stroke determined in this way.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 2 to 4.

In FIG. 2, 1 is a seat, 2 is a driven lever (driven member) 2, 3 is a hydraulic damper, and a hydraulic sensor 5 is installed to measure the hydraulic pressure generated by the hydraulic damper 3.

The output of the oil pressure sensor 5 is input to a computer (control device) 8, and based on this, the computer 8 calculates the muscle force characteristics acting on the driven lever 2 based on pressure (pushing force) and stroke, and displays the result on a display device (CRT). Display the graph on the screen of 9.

The arithmetic operations executed by the computer 8 will be explained according to FIG.

In steps 1 to 3, first, the scale of the orifice that determines the damping characteristics of the hydraulic damper 3 and the type of damper are input, and then the output value Px of the pressure sensor 5 is read.

As shown in FIG. 4, the pressure P generated by the hydraulic damper 3 is
It changes according to the damper operating speed V, and there is a correlation that as the speed ■ increases, the pressure increases rapidly, and this can be expressed as p = c, v2. However, C indicates a damping coefficient determined based on the thickness of the damper orifice, and the smaller the orifice area, the steeper the pressure rise.

In step 4, the acting force F is calculated based on the pressure value Px, the effective pressure receiving area of the damper, and the like. Also, from the pressure value Px, the damper coefficient C determined from the orifice scale and the type of damper, the damper speed ■ is calculated according to the characteristics shown in FIG. 4 (step 5.6).

This damper speed ■ is integrated to calculate the damper stroke S (step 7).

Then, by determining the above-mentioned acting force F in the unit damper stroke S, the muscle strength characteristics are calculated, and this is processed graphically and output to the display device 9 (step 8.9
).

In this way, the pressure value detected by the pressure sensor 5 is processed by the computer 8, and a muscle force characteristic curve is displayed in real time on the screen of the display device 9 as a graph based on the relationship between the acting force acting on the driven lever 2 and the displacement. can be displayed.

If the movement of the driven lever 2 is a rotational movement, the muscle force characteristic curve will more closely approximate the actual value if correction is made based on the rotation angle, but in this way the hydraulic damper 3 and the driven lever 2 are linked. Hydraulic tamper 3
The rotation angle of the driven lever 2 can be determined by calculation based on the stroke amount, and therefore correction according to the angle can be easily performed.

However, although not explained in this embodiment, when the driven lever (driven member) 2 moves linearly without rotating, or when the acting direction of the external force always matches the operating direction of the hydraulic damper 3. For this purpose, an accurate muscle strength characteristic curve can be immediately obtained without any correction.

It is clear that the present invention is applicable not only to training to strengthen leg strength but also to other training machines using the hydraulic damper 3.

(Effects of the Invention) As described above, according to the present invention, in order to display the muscle strength characteristic curve, it is sufficient to measure only the pressure value of the hydraulic damper.
The structure of the detection part is simplified and costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a diagram corresponding to claims showing the structure of the present invention, Fig. 2 is a block diagram showing an embodiment of the invention, Fig. 3 is a flowchart of control operation, and Fig. 4 shows the relationship between pressure and speed of the hydraulic damper. The characteristic diagram shown in FIG. 5 is a schematic diagram of a conventional example. 2... Driven lever, 3... Hydraulic damper, 5... Pressure sensor, 8... Computer, 9... Display device. c−+=−12Li Figure 4i! degree■ Figure 3

Claims (1)

[Claims] 1. In a training machine equipped with a driven member that moves by transmission of an external force and a hydraulic damper that applies resistance force to the driven member's movement, means for detecting the hydraulic pressure generated by the hydraulic damper, and determining the damper operating speed from the detected hydraulic pressure. means for calculating the acting force from the detected oil pressure;
A training machine characterized by comprising means for calculating a stroke by integrating velocity, and means for displaying a muscle strength characteristic curve calculated based on the acting force and the stroke.