FR2674760A1 - Dumb-bell (bar-bell) training device - Google Patents

Abstract

Dumb-bell training device, comprising a frame (10) on which are mounted two flexible traction elements (28, 29), the free ends (30, 31) of which are connected via a rod (32) so that the latter is suspended horizontally; the traction elements (28, 29) are connected to a drive device (16, 17, 20) for raising and lowering the dumb-bell (34). Provision is made for a control device which includes sensors (44, 38) intended to record the speed of displacement of the dumb-bell and the traction force exerted on the dumb-bell (34).

Description

i The present invention relates to a device

training with a dumbbell.

  Dumbbell training is part of

  muscle exercise When you want to develop

  muscle, the last two or three phases of

  lifting must be performed in the perfor-

  mances located above the threshold, that is to say in

  which the possibilities of the sportsman are already exceeded.

  As a result, the exhausted muscle strength is no longer enough to complete the movement.

  so need help from other people who bring him

  are providing the support necessary to complete the movement.

  DE 37 32 883 Ai describes a device for

  positive muscle training that activates automatically

  only an auxiliary motorized force, as soon as the athlete remains "blocked" in his movement This device replaces one or more people and is in particular designed for training devices in which the athlete acts via cables, on springs or weights which are guided for example on columns In this case, the direction in which the cables are pulled does not matter over a wide area and there is also no question of "fall", because the weights

are guided.

  However, athletes who would like to participate in competitions in the field of weight lifting, must perform at least 50% of their training with dumbbells, because the total degree of freedom of a dumbbell

  requires careful balancing in the horizontal direction

  tale, for which other muscles and reflexes of com-

  mande are solicited and trained The high level athletes exercise with a dumbbell weight of 400 kg and more For safety reasons, it is necessary in this case four people ready to intervene as soon as the dumbbell

  risk of falling The need to have these people

  Auxiliaries require an adaptation of the training program

  auxiliaries and takes a lot of time.

  The object of the invention is to indicate a device of the aforementioned type allowing an athlete to perform a

  training with a normal dumbbell, in the typical way

  teristic in this case, without having to resort to the help of other people.

  This goal is achieved with a training device -

  according to the invention in that there is provided a frame

  on which are mounted, freely suspended, two elements

  flexible traction elements spaced from one another horizontally, in that the free ends of the traction elements can be connected by a dumbbell rod so that the latter is suspended, approximately horizontally, on these ends , in that the

  traction elements are connected to a drive device

  motorized lifting and lowering of

  the dumbbell, in that there is provided a device for

  command which includes sensors for recording the speed of movement of the dumbbell and the force of

  traction exerted by the traction elements on the hal-

  tere, in that the control device is designed to control the drive device during the exercise lowering phase so that the traction elements are held taut with a first force

  reduced traction, as long as the speed of a-

  lowering the barbell does not exceed a given limit value, and in that the tensile force is increased, when this limit value is reached, as long as there is no further increase in speed

  lowering beyond this limit value.

  In this case, the dumbbell is suspended securely from the traction elements, but the sportsman practically does not feel it because of the flexibility of the traction elements, as long as he performs according to the rules (in the sense of the program of training) the movement of the dumbbell The reduced pulling force necessary to keep the traction elements taut is negligible compared to the weight of the dumbbell But as soon as the lowering speed becomes too great, the device provides movement control dumbbell, which

  definitely prevents a dumbbell fall.

  According to an advantageous variant of the invention, a low intermediate position can be given and, as a limit value of the lowering speed, a

  pre-selectable fixed value is activated by the

  control function, as long as the barbell rod is above the lower intermediate position, however a variable limit value depending on the stroke is activated by the control device, as soon as the barbell rod moves towards the bottom, in the range between the low intermediate position and the low position, the variable limit value having the value zero in the low position of the barbell rod The low intermediate position is fixed at approximately 5 & 10 cm,

  preferably 6 cm above the low position We guarantee

  tit as well as the limit value serving as limit of

  security, especially also at the end of the lowering phase

  training, is very closely adapted to the practical flow of the movement and that there is a

  quick reaction in case of failure.

  During the lifting training phase, it would be possible to insert an auxiliary force according to DE-37 32 883 Ai This auxiliary force intervenes by increasing slowly from zero, as soon as the lifting speed has dropped to a value which indicates that the sportsman has reached a neutral point But during this phase of increase in force, the lifting speed may initially decrease further considerably before the auxiliary force is large enough to

finally revive the movement.

  For dumbbell training in particular, this marked drop in lifting speed is not

  always desired; on the contrary, the movement must

  This is done with as much momentum as possible. In this case, a control device is provided which is designed so that the traction elements are kept tensioned with the first traction force, as long as the lifting speed of the dumbbell exceeds a given limit value, and in that the traction force is increased, when this limit value is reached, as long as there is no further reduction in the lifting speed, below this limit value On thus has in all cases a minimum speed corresponding to the limit value, regardless of the force supplied by the

  sportsman But as soon as the sportsman is able to exceed

  ser this minimum speed, it is naturally not

  prevented The automatic control nevertheless ensures

  days that the dumbbell is properly 'kept on a leash'.

  According to another variant of the invention, the

  lower intermediate position is fixed at about 5 to-

  cm, preferably 6 cm above the low position.

  This ensures that the forced lifting ends in the dumbbell position which represents the upper position of

  setpoint, according to the individual training program.

  If the athlete moves the dumbbell beyond, he can then

  stop it at any time (following the natural movement

  rel) It also ensures that the elements of

traction are tight.

  Before the exercise even begins, the dumbbell is normally in a preparation position, either flat on the ground, or a little higher on supports In this preparation position, the discs

  desired weights are mounted on the barbell rod.

  According to a variant of the invention, the control device actuates the drive device, activatable by a start signal, so that the dumbbell is raised from a preparation position to, the high position and is held in this high position The pulling force exerted on the dumbbell to raise it35 can be memorized, as a force signal, in a first memory of the control device, which

  pulling force represents the weight of the dumbbell.

  The dumbbell is thus lifted and held in a motorized manner.

  up to the upper position which corresponds to the stated set position The weight of the barbell is

  then automatically measured and stored.

  According to another variant, the content of the first memory, reduced by a first factor, serves as the first reference value which is compared to a force signal representing the current traction force and the

  control device is switched to the lowering phase

  exercise, as soon as the force signal passes

  briefly below the first reference value.

  The first factor is 20% The athlete can in

  this case, very simply remove the fixation of the hal-

  mother by briefly pressing it up so it does

  no need to operate a separate switch.

  To automatically switch the control device from the exercise lifting phase to a new lowering phase, a second memory is provided which is emptied at the end of each exercise lifting phase and in which each times a force signal representing the pulling force, as soon as and as long as the lifting speed of the dumbbell does not exceed the limit value of the lifting speed, during the lifting phase of exercise, in that the contents of the first memory, reduced by a second factor, serves as the second reference value which is compared with the value memorized in the second memory, in that the control device is switched to a new exercise lowering phase , when

  the value contained in the second memory is less

  lower than the second reference value and when at the same time the barbell rod is above the high position and the upward movement becomes zero, and the training program is stopped and the barbell maintained When stopped, as soon as it stops above the high position and, in doing so, the value contained in the second memory becomes greater than the second reference value If during the lifting phase, the athlete has used too much motorized auxiliary force, this is interpreted as the

  sign of too much exhaustion, which means that training

  is stopped But if the auxiliary force used

  stays below 80% of the weight of the dumbbell, the pro-

  gram of training is automatically continued The

  can thus fully and exclusively concentrate

  trer on the dumbbell and need not worry about whether or not to continue The forces recorded by the control device, free from any subjective impression, are perfectly reliable decision criteria. According to a variant of the invention, provision is made for the control device to switch from the exercise lowering phase to the exercise lifting phase, as soon as the dumbbell reaches the low position or is raised. at a speed exceeding the limit value of

lifting speed.

  Overall, the device therefore makes it possible to guarantee reliable fixing of the dumbbell in any position and in any exercise phase, without the athlete feeling the device, as long as he himself sufficiently controls the movement of the dumbbell. dumbbell help

  and protection only intervene when necessary.

  Various other features of the invention

  emerge from the detailed description which follows.

  A preferred embodiment of the invention is shown by way of non-limiting example in the drawings

attached.

  Figure 1 is a schematic and simplified front view of a device according to the invention;

  FIG. 2 is a diagram of the driving device

  ment with the control device for the device according to Figure 1;

  Figure 3 is a block diagram of the device

  order tif for the preparation phase;

  Figure 4 is a block diagram of the device

  control tif for the exercise lowering phase;

  Figure 5 is a block diagram of the device

  control tif for the exercise lifting phase.

  According to Figure 1, the device comprises a frame with two lateral uprights 11, 12, spaced from one another, which bear and are firmly anchored to the ground 13 The lateral uprights 11, 12 have an approximate height of 3 , 5 meters and carry, as a closure, a cross member 14 on which are mounted a motor control 15, an electric motor 16, a transmission 17 with a gear ratio of 28: 1, a toothed belt wheel 18 and a sensor

position 19.

  About 50 cm below extends a winding tree.

  LEMENT 20 whose two ends are rotatably mounted

  but axially fixed in supports 21, 22 which are fixed on the lateral uprights 11, 12 Below the toothed belt wheel 18 is also located on the winding shaft 20, a toothed belt wheel 23, and a toothed belt 24 passes over the two wheels 18, 23 The winding shaft 20 is thus coupled fixed in

  rotation with the drive shaft 25.

  On the winding shaft 20 are fixed, spaced apart, two winding drums 26, 27, on each of which are fixed fabric straps 28, 29 flat, so as to be wound or unwound according to the rotation

  of the winding shaft 20 In the situation shown

  They are almost completely unrolled.

  lower free straps of the fabric straps 28, 29 are folded in a loop 30, 31, so that they can be threaded on a barbell rod 32 On the barbell rod 32 are applied, in known manner, discs of weight 33 and these form with the dumbbell rod 32 a normal dumbbell 34 The loops 30, 31 are preferably located right against the turned inside faces

  one towards the other of the discs of weight 33.

  Due to the flexible straps 28, 29, the movement of the dumbbell 34 perpendicular to the plane

  of the drawing is not hampered, but in the horizontal direction

  tale either, the suspension is not too rigid Instead of the straps, we could also provide round braided cables, but the flat straps are wound

  in a better controlled manner, without the ends retom-

  bant freely are inconveniently moved.

  Between the two lateral uprights 11, 12, two commercial supports 35, 36 are placed on which

  dumbbell 34 can be held in the prep position

  tion In this position, the suitable weight discs 33 are mounted on the barbell rod 32 But, the barbell 34 can also rest on the floor 13, if the straps 28, 29 are long enough Figure 1

  schematically represents an athlete who

  holds the dumbbell 34 in the low position Pos 4 according to his individual training program It is understood that this position depends on the size of the sportsman The high position Pos 1 to which he must normally raise the dumbbell during the exercise, is determined in the same way So that the control device which will be described later, can control the movement, the position sensor 19 generates a position signal P which represents the exact height position of the dumbbell 34 or the barbell rod 32 Since in this embodiment, the position sensor 19 is connected to the drive shaft 25 and therefore only counts its rotations, this direct count signal must be converted into the position exact dumbbell, the influence of the variation in the diameter of the winding turns 37 of the straps 28, 29 must in particular be compensated This correction calculator is conveniently housed in the control device, m but for reasons of clarity, it is assumed below that the position sensor 19

  delivers the exact position signal P.

  It is understood that the position signal P can also be derived in another way, for example by scanning the position of the dumbbell, according to the principle of echo sounding with light (laser) or the like. In addition, the tension of the straps 28, 29 is important for controlling the movement. For this purpose, a force sensor could be inserted in the strap 28, just above the loop 30, according to the principle of an elongation measuring tape But the transmission of the signal to the control device is a bit complex A mechanical feel of the strap tension, shown schematically in FIG. 2, is more robust and

  less complex Figure 1 shows only the arrangement

  force sensor 38 just below the drum

winding 26.

  Figure 1 does not show a control console which includes a keyboard for entering parameters

  and a numerical display indicating the characteristics

  ristics of the exercise This control console which preferably also contains the control device,

  is shown schematically in Figure 2.

  FIG. 2 represents the essential elements of the drive device, such as the motor 16, the transmission 17 with the transmission shaft 25 and the

motor control 15.

  A suitable motor control is described

  for example in a report by P Zimmermann in "wt -

  Zeitschrift fur industrielle Fertigung "Heft 73 (1983), pages 629 to 632, under the title:" B Urstenlose

  Servoantriebe fur Werkzeugnaschinen '.

  This motor control 15 comprises a control circuit 39 which converts a three-phase alternating service voltage 40 of 380 V for example into an alternating voltage of three-phase motor 41 of variable frequency and intensity, which makes it possible to vary the torque of rotation of the motor 16, the speed of rotation and the direction of rotation The motor 16 is preferably a synchronous motor, that is to say that its rotor has permanent magnets To the motor shaft 42 are coupled a position sensor rotor 43 for generating a switching signal C and a tachometer generator 44 for generating a tachometer signal T (which

  corresponds to the speed of rotation of the motor shaft).

  The signal C controls the currents in the stator windings The tachometer signal T represents the actual value of the speed of rotation and is sent to the control circuit 39 and to the control device 45 The control circuit 39 also receives a speed signal v which represents the setpoint for the speed of

  motor rotation (and direction of rotation).

  On the motor shaft 42 (but also on the winding shaft 20) can be mounted a mechanical brake 46 which is electromagnetically actuated. In the event of a power failure or control failure, the winding shaft 20 is firmly held, so it

  cannot occur even in these cases.

  To the transmission shaft 25 is coupled the position sensor 19 already mentioned and finally the winding shaft 20 with the winding drum 26 (assembled here schematically only) The strap 28 to

  which is attached the dumbbell 34, hangs from the winding drum

  Lement 26 The force sensor 38 has an upper pair and a lower pair of guide pulleys 47, 48, so that the strap 28 is guided up and down in a defined position Between them is a pressure roller 49 which tends, according to the force of a spring 50, to bend the strap 28 The greater the tension of the strap 28, the more the pressure roller 49 is pressed to the right in FIG. 2 When the tension decreases, the roller pressure 49 moves to the left, proportional to the tension The position of the pressure roller 49 therefore constitutes a value of the tension prevailing in the strap 28 or of the pulling force exerted on the dumbbell If the dumbbell 34 is suspended freely, the pulling force is equal to half the weight of the dumbbell The pressure roller 49 is connected to the socket 51 of a potentiometer 52 and moves the latter according to the pulling force A force signal F (signal strength) can thus be pre lifted from

  prize 51 This representation is a schematic diagram.

  The position signal P of the position sensor 19 and the force signal F of the force sensor 38 are

  sent to control unit 45.

  The sequence of the command is described with reference to FIGS. 3 to 5 These diagrams must not be produced in a concrete form These figures represent only different states of organization of a processor command Consequently, according to an operating program , certain parts of the equipment are organized as necessary, so that input signals are exploited and chained in a given logic, to produce, as a function of this, a speed signal v of determined size and sign, which serves setpoint value according to figure 2 for the

motor control 15.

  In Figures 3 to 5, the signals P, T and F, from

  These sensors are marked with circles, while the signals coming from the control device itself are referenced by triangles. As can be seen from FIG. 1, the dumbbell 34 must be moved during the exercise of the positions Pos 1 & the position

  Pos 4 and vice versa Corresponding imposed values

  tes are stored in the control device 45, by the input keyboard, which control device then calls, if necessary, corresponding signals,

  Organized memory for this purpose In addition, the

  control unit automatically calculates a high intermediate position Pos 2, located 20 cm below Pos 1 and a low intermediate position Pos 3, located

Approx. 6 cm above Pos 4.

  FIG. 3 represents the logic circuit of the preparation phase The dumbbell 34 is in the preparation position, for example on the supports 35, 36 of FIG. 1 By a short press on a start button 53, the rocker FF 1 is placed so that at its output Q appears the signal value 1 Given that at this instant, the value of the signal P in the comparator Cl is less than the value of the signal Pos 2, the output Q of the comparator Cl also has the signal value 1 The condition AND at the inputs of the AND member Ai is thus satisfied, which means that the switch Si is closed As shown in the diagram, the control device therefore reads a given value v H '' contained in a corresponding memory and delivers it in the form of a set value v The dumbbell is lifted

high speed.

  As soon as the dumbbell reaches Pos 2, the comparison

  tor C 2 reacts Its output signal replaces the flip-flop FF 1, so that the switch SI opens In its place intervenes the flip-flop FF 2 whose output signal closes the switch 52 and 53 By means of 52, the value v H is delivered in the form of a set value v which is less than v H 'Via 53, the signal F is stored in a first memory M1, so that the instantaneous weight of the dumbbell 34 y

is therefore memorized.

  As soon as the dumbbell reaches the high position Pos 1, the comparator C 3 intervenes and replaces the rocker FF 2 It follows that the switches 52 and 53 open

  and the preparation phase is over.

  The IT equipment takes over the state of organization

  sation represented in FIG. 4 Consequently, by the switch 54 not activated, the value vo which again represents the set value v, by the switch 57 in FIG. 5 (which must be considered as an extension of this diagram), is delivered as setpoint v 'The setpoint v = vo means that

  dumbbell 34 is kept stationary in Pos l.

  The athlete can now grasp the hal- rod

  block 32 and first press it briefly upwards, which does not necessarily translate into an upward movement It suffices to relieve the strap 28 Indeed, the weight signal stored in the memory Ml and reduced by a first factor equal to 0.2 or 20% is given, as the first reference value, at input B of a comparator C 4 at input A to which the signal F Si applies as a result of the discharge of the straps, the value of the signal F goes below the first reference value (0.2 x G, with G = weight of the dumbbell), the comparator C 4 intervenes Since, in addition, P =

  Pos 1, the comparator C 5 also intervened The condition

  tion AND of the organ ET A 2 is thus satisfied, which means that the flip-flop FF 3 is put in place By its output

  Q, switch 54 is switched and the lowering phase

exercise is activated.

  In this state of organization, an invariable limit value v S given for the lowering speed is read and delivered, in the form of a set value v, by means of the switch 55 and the switches 56, 54 and 57 (Figure 5), as long as the

  is unable to slowly lower the hal-

  tere with its own force In comparator C 6, the signal T is compared with the limit value v S. As soon as T is less than A v S (which is unlikely at the start of the exercise), comparator C 6 intervenes and switches the switch 56 In this case, the control device generates a force-follow-up-signal in the direction of force regulation, the signal F being used for this purpose The force regulation is preferably designed so that the straps 28, 29 are kept tensioned with a first tensile force reduced by N, so that the dumbbell 34 is always guided, under control But this first tensile force is so small compared to the weight of the dumbbell that the sportsman does not feel it As long as he therefore masters the dumbbell by its force, the device does not come into operation in a perceptible way by him It is

  of course the limit value vs is given individually

  dual according to the athlete's training program

  (for example entered on the keyboard).

  The following description relates to the final domain

  of the exercise lowering phase In fact, as soon as the dumbbell goes below the low intermediate position Pos 3, the comparator C 7 intervenes (figure 4) and activates the switch 55 A variable limit value v SP , depending on the stroke, is read, and this under the control of the signal P This is done in that the limit value v SP in Pos 3 coincides with the value v S, but reached

the zero value in Pos 4.

  This limit value v variable SP now reaches

  as a reference to input B of the comparator C 6 If therefore the sportsman cannot brake the dumbbell sufficiently with his own force, the straps 28, 29 are kept taut, otherwise the drive mechanism brakes the movement of the dumbbell until in no case is the current instantaneous lowering speed limit value exceeded Even in the event of a failure

  total lance of the sportsman, the barbell remains at a standstill

  when the low position Pos 4 is reached.

  So that the sportsman knows when to start to brake the movement at the latest, an acoustic signal sensor 54 can be activated at the same time as the switch 55 Experienced sportsmen can

move on from this help.

  The principle of switching the lowering phase

  The lifting phase is described with reference to the

  figure 5 During the last part of the lowering phase

  The reference value v also corresponds firstly to the reference value v ', as it arrives from the previously described state of the control device, since the switch 57 is in the position shown. sees, the switch 57 is actuated by the flip-flop FF 4 which for its part is activated by the organ OR OD 1, when the value of signal 1

  applies to at least one of its entries.

  As soon as the dumbbell 34 therefore reaches the low position Pos 4, the comparator C 8 delivers to the output Q the signal value 1 which thus satisfies the OR condition of OD 1 This then activates the switch 57 by FF 4 We thus switch from the exercise lowering phase to the exercise lifting phase, the limit value signal v H or the force tracking signal Ff being delivered as setpoint v, via 58 More than

  details will be provided below.

  When the athlete is able to lift the dumbbell again with his own force, at a speed exceeding the limit value v H, before the dumbbell reaches the low position Pos 4, this naturally takes precedence This state is stored in comparator C 9 and a signal value 1 is delivered to the second input of OD 1, so that switch 57 is

activated by FF 4.

  During the exercise lifting phase which now takes place, the straps 28, 29 are only kept tensioned, as long as the athlete is able to move the dumbbell 34 faster than v H, which is indicated by the comparator C 9 Its output is linked for this purpose to

  an input from an organ OR OD 2, which then activates the int-

  switch 58 As soon as the athlete can no longer exceed this limit value, with his own force, the drive mechanism provides guidance The activation and deactivation of switch 58 can also take place

  often as desired, depending on the athlete's condition.

  But as soon as the dumbbell has reached the high position Pos 1, by which the sportsman has fulfilled his duty, in all cases the straps 28, 29 are only held taut, which is obtained by the fact that the second entry of OD 2 receives from signal comparator C 10 the signal value 1, by which switch 58 remains

  switched to force tracking signal Ff, independent

  the lifting speed The athlete thus has the freedom to move the dumbbell beyond Pos 1, when this corresponds to his pace of movement But

  the dumbbell is reliably held by the straps

so tense.

  In order for the sportsperson to notice that the dumbbell has reached the high position Pos 1, an acoustic signal sensor 55 can be activated with the output signal

of comparator C 10.

  The limit value v H of the lifting speed is

  planned individually according to the training program

  of the athlete and is generally less than

  the limiting speed v S of the lowering speed.

  As shown in FIG. 5, the comparator C 10 indicates the cases where the dumbbell 34 has exceeded the high position Pos l The movement of the dumbbell is controlled by another comparator Cil and a signal value 1 is not

  delivered to the Q output only when the speed of the hal-

  tere is null One can thus connect between them the two conditions which must involve a commutation on the phase of lowering of exercise, by connecting the outputs of comparator 10 and 11 to the entries of an organ AND A 3, which then replaces only the flip-flop FF 4 and brings

  switch 57 in rest position The lowering phase

  thus is again restored to the state of

  Figure 4; it should be noted that the rocker FF 3 and the inter-

switch 54 are still activated.

  But according to a preferred variant, there is provided a kind of performance control which decides according to the instantaneous possibilities of the sportsman, if the exercise can be continued or must be interrupted. It is indeed common for athletes who focus on the exercise , are not able to appreciate their

fair value their possibilities.

  This performance check is based on the fact

  that during the exercise lifting phase, it is contr 8-

  the force with which the engine must intervene

  drive mechanism contributes more or less strong-

  in displacement in all cases where the lifting speed signal T is not greater than the limit speed v H This is always the case when the signal value 0 This applies to the output Q of the comparator C 9 connection is linked to the inverting input of an ET A 4 member whose second (normal) input is connected to the

exit from FF 4).

  Signal value 1 to FF 4 means that the exercise lifting phase is activated (first condition AND) and signal value O to C 9 means that the mechanism

  contributes a little to the movement of the hal-

  tere (second condition ET) If therefore these two signal values are given, the switch 59 is activated via A 4, so that the signal F representing the instantaneous force share of the drive mechanism, is recorded in a second memory M 2 This recording is carried out at determined time intervals, again and as often as the aforementioned second AND condition is satisfied during a lifting phase. The content of the memory M 2 is thus constantly updated. it is understood that the zero value is memorized when during a lifting phase, no recording occurs, because at the end of each lifting phase, the memory M 2 is always

reset.

  Two comparators C 12 and C 13 then compare the value a F stored in the second memory M 2 A to a second reference value which is formed by the fact that the weight signal coming from the first memory

  Ml is reduced by a second factor equal to 0.8 or 80%.

  If therefore, the pulling force exerted by the drive mechanism on the dumbbell (according to a F) must maintain more than 80% of the weight of the dumbbell, this is interpreted as a sign that the sportsman has exceeded his possibilities. comparator C 12 then gives the value of signal 1 to an input of an AND member A 5 of which two other inputs are connected to the outputs Q of C 10 and Cll (which signals the end of the lifting phase) As soon as the end of the lifting is reached with the stop of the dumbbell above the high position Pos 1 and that therefore, the condition ET of the member ET A 5 is satisfied, the rocker FF 4 is replaced, by means of d 'an organ OR OD 3, used for uncoupling, so that 57 also is returned to the rest position shown At the same time, the second memory M 2 is reset to zero In addition, A 5 is also replaced by the lever FF 3 ( in FIG. 4), which means that the switch 54 again takes up the rest position shown La value vo is thus delivered in the form of set value v, that is to say that the drive mechanism keeps the dumbbell 34 stationary, as was the case at the end of the preparation phase Un new start by pressing up the dumbbell

  would now be required to trigger the lowering

  sement. But if the traction force exerted by the drive mechanism on the dumbbell, during the lifting phase (according to a F) remains below 80% of the weight of the dumbbell, the comparator C 13 delivers the value signal 1 at the third input of the device AND A 3 With this additional AND condition, the exercise is prolonged by switching to the exercise lowering phase only if the athlete has sufficient capacity The switching takes place by replacing FF 4 (via OD 3) and by resetting the second memory M 2 without FF 3 (9 in FIG. 4) being replaced. Unlike Figure 2, the straps can also be only deflected to the right of the drums

* winding 26, 27, which means that the winding shaft

  Lement proper can be placed in another position, for example behind the sportsman, & near the ground. Since in this exemplary embodiment, the speed sensor 44 (FIG. 2) is directly connected to the motor shaft 42, but that the latter moves the dumbbell 34 via the variable diameter of the winding turns 37 (FIG. 1), the representation using FIGS. 3 to 5 must be understood exactly, in the sense that a speed signal T is used, a

  corrected signal in which the influence of winding turns

  Lement 37 is compensated by the calculation But, on the other hand, in a manner similar to the position of the force sensor 38, a tachometer roller can be directly driven by the strap 28, so that no correction calculation is not necessary For example, the pressure roller 49 of the force sensor 38 can simultaneously constitute the rotor of a tachometer And the rotation of the pressure roller 49 can at the same time also provide a

position signal.

Claims (18)

  1 drive device 5 with a dumbbell, characterized in that there is provided a frame (10) on which are mounted, freely suspended, two traction elements (28, 29) flexible spaced from each other horizontally, in that the free ends (30, 31) of the traction elements (28, 29) can be connected by a dumbbell rod (32) so that it is   suspended, almost horizontally, on these extremi-   tees, in that the traction elements (28, 29) are connected to a drive device (16, 17, 20) for the motorized lifting and lowering of the dumbbell (34), in that it a control device (45) is provided which comprises sensors (44, 38) intended to record the speed of movement (T) of the dumbbell and the traction force (F) exerted by the traction elements (28, 29 ) on the dumbbell (34), in that the control device (45) is designed to control the training device during the exercise lowering phase so that the traction elements (28, 29) are kept taut with a reduced first pulling force (Ff), as long as the dumbbell lowering speed does not exceed a given limit value (v S, v SP), and in that the pulling force is increased , when this limit value (v S, v SP) is reached, as long as there is no further increase in the   lowering speed beyond this limit value.   2 Device according to claim 1, character-   rised in that the control device (45) is designed to control the drive device, during the exercise lifting phase, so that the traction elements (28, 29) are held taut with the first force of traction (Ff), as long as the lifting speed of the dumbbell exceeds a given limit value (v H), and in that the traction force is increased, when this limit value (v H) is reached, as long as no further reduction in the speed of   lifting, below this limit value.   3 Device according to claim 1, character-   risé in that the control device (45) comprises a sensor (19) intended to record the position in height of the barbell rod (32) and in that the high position (Pos 1) and the low position (Pos 4) to be achieved during the exercise can be given and stored in the control device (45).   4 Device according to claim 3, character-   in that a low intermediate position (Pos 3) can be given and in that, as a limit value of the   lowering speed, a fixed value (v S) pre-selection-   level is activated by the control device (45), as long as the barbell rod (32) is above the lower intermediate position (Pos 3), in that however a variable limit value (v SP) stroke function is activated by the control device, as soon as the barbell rod (32) moves down, in the range between the low intermediate position (Pos 3) and the low position (Pos 4), the variable limit value (v SP) having the value zero in the position   low (Pos 4) of the barbell rod.   Device according to claim 4, characterized in that the lower intermediate position (Pos 3) is fixed at approximately 5 to 10 cm, preferably 6 cm above from the low position (Pos 4).   6 Device according to claim 3, character-   that the control device (45) controls the drive device so that the elements   tension (28, 29) are kept taut, independent   the speed of movement of the dumbbell (34), only by the first pulling force (Ff), as soon as the dumbbell rod (32) moves upwards,   above the high position (Pos 1).   7 Device according to claim 3, character-   risé in that the control device (45) controls the drive device, activatable by a start signal, so that the dumbbell (34) is raised from a preparation position to the high position (Pos 1 )   and be kept in this high position.   8 Device according to claim 7, characterized in that the tensile force exerted on the dumbbell (34) to lift it can be stored, as a force signal (F), in a first memory (Ml) of the device control, which pulling force represents the weight of the barbell (34).   9 Device according to claim 8, character-   rised in that an upper intermediate position (Pos 2) can be given and in that the storage of the force signal (F) in the first memory (Ml) takes place only during the movement of the dumbbell (34 ), from the intermediate position (Pos 2) to the high position (Pos 1).   Device according to claim 8, character-   laughed in that the content of the first memory (Ml), reduced by a first factor, serves as the first reference value which is compared with a force signal (F) representing the current traction force and in that the device The control signal (45) is switched to the exercise lowering phase as soon as the force signal (F) briefly goes below the first reference value.   11 Device according to claim 10, charac-   terized in that the first factor is equal to 20%.   12 Device according to claim 8, character-   laughed in that a second memory (M 2) is provided which is emptied at the end of each exercise lifting phase and in which a force signal (a F) representing the traction force is memorized each time, as soon as and as long as the lifting speed of the dumbbell (34) does not exceed the limit value (v H) of the lifting speed, during the exercise lifting phase, in that the contents of the first memory (Ml), reduced by a second factor, serves as a second reference value which is compared with the value stored in the second memory (M 2), in that the control device (45)   is switched to a new exercise lowering phase   when the value in the second memory (M 2) is less than the second reference value and when at the same time the barbell rod (32) is above the high position (Pos 1) and the upward movement becomes zero, and in that the training program is stopped and the dumbbell (34) kept stationary, as soon as it stops above the high position (Pos 1) and that in doing so, the value contained in the second memory (M 2) becomes greater than the second reference value.   13 Device according to claim 12, charac-   terized in that the second factor is equal to 80%.   14 Device according to claims 2 and 4,   characterized in that the control device (45) switches from the exercise lowering phase to the exercise lifting phase, as soon as the dumbbell (34) reaches the low position (Pos 4) or is raised at a speed exceeding the limit value (v H) of lifting speed.   Device according to claim 14, charac-   terized in that the control device (45) triggers an acoustic signal, as soon as the dumbbell (34) reaches the low intermediate position (Pos 3) during the phase lowering exercise.   16 Device according to claim 12, charac-   terized in that the control device (45) triggers an acoustic signal, as soon as the dumbbell (34) reaches the high position (Pos 1), during the exercise lifting phase.   17 Device according to claim 1, character-   laughed at in that the traction elements are straps fabric (28, 29) flat.   18 Device according to claim 1, character-   risé in that the sensor (38) comprises, to record the traction force, an element (49) which is displaceable by the traction element (28), against a pre-stress, according to the tension of the traction element.   19 Device according to claim 1, character-   in that the frame (10) has a winding shaft   LEMENT (20) horizontal, placed above the head, which   can be rotated by a solid motor (16)   of the frame, and which carries by winding or by   pulling down, the traction elements (28, 29).   Device according to claim 19, charac-   terized in that the motor (16) is coupled to the shaft   winding (20), by a reduction gear (17).   21 Device according to claim 1, character-   laughed at in that the drive device has a   brushless electric motor, electronically switched.   22 Device according to claim 21, charac-   terrified in that the electric motor is a synchronous motor.