EP0560073B1 - Exercise apparatus - Google Patents

Exercise apparatus Download PDF

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Publication number
EP0560073B1
EP0560073B1 EP93102187A EP93102187A EP0560073B1 EP 0560073 B1 EP0560073 B1 EP 0560073B1 EP 93102187 A EP93102187 A EP 93102187A EP 93102187 A EP93102187 A EP 93102187A EP 0560073 B1 EP0560073 B1 EP 0560073B1
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EP
European Patent Office
Prior art keywords
belt
pulley
training apparatus
guide roller
tension spring
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EP93102187A
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German (de)
French (fr)
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EP0560073A1 (en
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Dieter Miehlich
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Individual
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Individual
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B22/00Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
    • A63B22/06Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement
    • A63B22/0605Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement performing a circular movement, e.g. ergometers
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B21/00Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
    • A63B21/005Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using electromagnetic or electric force-resisters
    • A63B21/0053Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using electromagnetic or electric force-resisters using alternators or dynamos

Definitions

  • the invention relates to a training device according to the preamble of claim 1.
  • a generic exercise device is known from US-A 4 705 493.
  • US-A 4 705 493 With this arrangement, when retensioning a belt running between a large and a small pulley by deflecting a deflection roller due to the spring force of a spring, the working strand and the empty strand of the belt move towards one another and there is a risk of them touching. Therefore, the smaller pulley cannot be made with an arbitrarily small diameter.
  • FR-A 927 986 discloses a flat belt with a tread profile serrated in cross section for an arrangement with a large and small pulley formed with a corresponding circumferential profile.
  • the toothed tread pattern of the flat belt according to the invention not only results in extremely low-noise operation, but at the same time also ensures reliable transferability of high performance.
  • the tread pattern also results in a reliable Belt guide so that it cannot run even under heavy use.
  • the flat belt according to the invention enables the use of a comparatively small diameter of the brakeable pulley, with which a large, one-stage transmission ratio can be achieved with a compact design.
  • the deflection roller can be accommodated on a swivel lever of great length, the swivel axis parallel to the axes of the pulley, together with the axis of the deflection roller in the tensioned position, lying in a plane that is approximately perpendicular with respect to the working strand of the belt.
  • the circular movement curve of the pulley affects a parallel to the belt's working run. Due to the large length of the swivel lever, similar conditions can be achieved as in the case of a straight guide, despite the oscillating suspension of the deflection roller.
  • the wrap angle that can be achieved is also approximately 180 ° here.
  • the length of the pivot lever can expediently be at least 5 times, preferably 6 times, the radius of the deflection roller.
  • the curvature of the movement curve of the deflection roller is practically no longer noticeable.
  • the long swivel lever is advantageously mounted on a standing spar of the device frame, which enables a large swivel lever length even when the swivel lever is suspended.
  • tension spring which is preferably designed as a tension spring, is arranged approximately at right angles to the pivoting lever, which results in clear force relationships.
  • the training device on which FIG. 1 is based in the form of a bicycle ergonomometer, contains a frame designed here as a tube construction with a lower support beam 1 which laterally protrudes to ensure sufficient stability and a structure 2 fastened thereon, which carries a seat 3 and a holding bracket 4.
  • the structure 2 is provided with a bottom bracket 5 arranged below the seat 3 for a pedal arrangement 6 which can be actuated by a person taking a seat on the seat 3.
  • a braking device 7 arranged on the frame, here in the form of a generator placed on the support beam 1 in front of the structure 2, can be driven, by means of which the power that is exercised by the training person is destroyed.
  • the so destructible performance is in the field of view the training person arranged, here attached to the bracket 4 adjusting and display 8 adjustable and displayable.
  • the setting and display device 8, which is connected to the braking device 7 by means of a signal line 9, is provided with a manually operable setting member 10, here in the form of an adjusting button cooperating with a scale, and a display 11.
  • the setting and display device 8 can also be provided with an integrated program control device which specifies a desired course of the power which can be destroyed by the braking device 7, as a result of which, for example, natural conditions in the form of ascent and descent and the like can be simulated .
  • a single-stage belt drive 12 which is designed such that, despite its single-stage design, a high gear ratio of 1:15 to 1:25, preferably 1:20 to 1:22 , results.
  • a relatively large diameter pulley 14 is wedged onto the shaft 13 of the pedal arrangement 6.
  • the input shaft stub of the generator forming the braking device 7 is designed as a further pulley 15 of comparatively small diameter.
  • the pulley 14 of large diameter which can be driven by the pedal arrangement 6 and the pulley 15 of small diameter which can be braked by the braking device 7 are connected to one another by an endless belt 16 connected.
  • the diameter of the smaller pulley 15 can be 20mm.
  • the belt 16 is, as can best be seen from FIG. 2, in the form of a flat belt which has a tread profile 17 which is toothed in cross section in a roof shape. Accordingly, there are triangular webs or grooves in cross section. At least one of the two pulleys 14, 15 is provided with a circumferential profile 18 which is adapted to the tread profile 17 of the belt 16 and has corresponding grooves and webs. As a rule, it is sufficient if at least the smaller pulley 15 has the circumferential profile 18 mentioned.
  • the larger pulley 14 can have a cylindrical tread.
  • the mentioned profiling of the belt 16 and at least the smaller pulley 15 ensures reliable belt guidance and reliable power transmission with little slippage. Nevertheless, even with a small pulley diameter of the order of 20mm, there is a gentle belt circulation.
  • the belt 16 according to the invention thus combines the advantages of flat and V-belts and avoids the mutual disadvantages.
  • the smaller pulley 15 is assigned a device 19 for increasing the wrap angle of the belt 16.
  • This consists of a in and out of the driving, larger pulley 14 freely rotatably mounted deflection roller 20 which engages on the braked, smaller pulley 15 and runs freely on the belt 16.
  • This can be provided with lateral guide flanges.
  • the deflection roller 20 is acted upon by an associated tension spring 21 in such a way that the empty run of the belt 16 is deflected inward in relation to the tangential course indicated by a dashed line.
  • the deflection roller 20 is arranged such that the portion of the belt run that runs onto the smaller pulley 15 runs approximately parallel to the section of the belt working run that runs from the pulley 15 and the belt 16 the smaller pulley 15 accordingly at an angle of 180 ° wraps around.
  • the deflection roller 20 can be slidably mounted on a longitudinal guide running approximately parallel to the working run of the belt 16.
  • the deflection roller 20 is received on a pivot lever 22 which is suspended in a pendulum manner on a standing spar of the structure 2.
  • the pivot lever 22, ie the distance between its pivot axis and the axis of the deflection roller 20, has a length of at least 5 times, preferably 7-, which is comparatively large with respect to the size of the deflection roller 20. up to 9 times the effective deflection roller radius.
  • the diameter of the deflection roller 20 can be 40-50mm.
  • the pivot bearing 23 of the pivot lever 22 is placed so that the pivot axis of the pivot lever 22 and the axis of the deflection roller 20 are in a common plane which is perpendicular to the working strand of the belt 16.
  • the length of the belt 16 is accordingly dimensioned so that in the tensioning position on which FIG.
  • This is designed as a spring with a comparatively soft spring characteristic, that is to say a low spring constant, so that the spring force exerted thereby is practically constant within a small spring travel.
  • the tension spring 21 is arranged here so that the spring axis extends approximately perpendicular to the pivot lever axis, whereby the fluctuation in the spring length is minimized.
  • the tension spring 21 engages on the one hand on the axis 24 of the deflection roller 20 and on the other hand on a retaining bolt 25 fastened to the support beam 1.
  • the ends of the tension spring 21 are designed as suspension claws.

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  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Description

Die Erfindung betrifft ein Trainingsgerät gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a training device according to the preamble of claim 1.

Ein gattungsgemäßes Trainingsgerät ist aus der US-A 4 705 493 bekannt. Bei dieser Anordnung bewegen sich beim Nachspannen eines zwischen einer großen und einer kleinen Riemenscheibe verlaufenden Riemens durch Auslenkung einer Umlenkrolle aufgrund der Federkraft einer Feder das Arbeitstrum und das Leertrum des Riemens aufeinander zu und es besteht die Gefahr, daß sie sich berühren. Deshalb kann die kleinere Riemenscheibe nicht mit beliebig kleinem Durchmesser ausgebildet sein.A generic exercise device is known from US-A 4 705 493. With this arrangement, when retensioning a belt running between a large and a small pulley by deflecting a deflection roller due to the spring force of a spring, the working strand and the empty strand of the belt move towards one another and there is a risk of them touching. Therefore, the smaller pulley cannot be made with an arbitrarily small diameter.

Desweiteren ändert sich bei Längung des Riemens dessen Umschlingungswinkel an beiden Riemenscheiben. Bezüglich der kleinen Riemenscheibe wirkt sich diese Änderung besonders stark aus, was zu einer starken Veränderung der Kraftübertragungsverhältnisse führt.Furthermore, when the belt is elongated, its wrap angle changes on both pulleys. With regard to the small pulley, this change has a particularly strong effect, which leads to a major change in the power transmission ratio.

Die FR-A 927 986 offenbart einen Flachriemen mit im Querschnitt gezahntem Laufflächenprofil für eine Anordnung mit einer, mit einem entsprechenden Umfangsprofil ausgebildeten großen und kleinen Riemenscheibe.FR-A 927 986 discloses a flat belt with a tread profile serrated in cross section for an arrangement with a large and small pulley formed with a corresponding circumferential profile.

Ausgehend von der eingangs beschriebenen gattungsgemäßen Anordnung ist es daher die Aufgabe der vorliegenden Erfindung, unter Vermeidung der Nachteile der bekannten Anordnungen ein Trainingsgerät gattungsgemäßer Art zu schaffen, das die Einhaltung einer hohen Genauigkeit mit einfachen Mitteln ermöglicht sowie eine hohe Zuverlässigkeit und geringe Lärmentwicklung gewährleistet und bei dem gleichzeitig ein hohes Übersetzungsverhältnis des Riementriebs und damit eine einfache Bauweise erreichbar sind.Starting from the generic arrangement described at the outset, it is therefore the object of the present invention, while avoiding the disadvantages of the known arrangements, to create a generic type of training device which enables high accuracy to be maintained with simple means, and which ensures high reliability and low noise levels and at the same time a high gear ratio of the belt drive and thus a simple construction can be achieved.

Diese Aufgabe wird erfindungsgemäß durch das Kennzeichen des Anspruchs 1 gelöst.This object is achieved by the characterizing part of claim 1.

Diese Maßnahmen ergeben in vorteilhafter Weise eine höchst einfache und kostengünstige Bauweise. Das gezahnte Laufflächenprofil des erfindungsgemäßen Flachriemens ergibt nicht nur einen äußerst geräuscharmen Betrieb, sondern gewährleistet gleichzeitig auch eine zuverlässige Übertragbarkeit einer hohen Leistung. Zudem ergibt das genannte Laufflächenprofil auch eine zuverlässige Riemenführung, sodaß dieser auch bei starker Beanspruchung nicht verlaufen kann. Außerdem ermöglicht der erfindungsgemäße Flachriemen die Verwendung eines vergleichsweise kleinen Durchmessers der abbremsbaren Riemenscheibe, womit sich bei kompakter Bauweise ein großes, einstufiges Übersetzungsverhältnis erreichen läßt. Dieser Vorteil wird dadurch noch unterstützt, daß mit Hilfe der erfindungsgemäßen Anordnung der Umlenkrolle ein großer Umschlingungswinkel erreichbar ist, sodaß auch bei kleinem Riemenscheibendurchmesser eine zuverlässige Leistungsübertragung gewährleistet ist und die Berührung des Arbeitstrums und des Leertrums zuverlässig vermieden wird. Ein weiterer, ganz besonderer Vorteil der erfindungsgemäßen Maßnahmen ist auch darin zu sehen, daß der nicht zu vermeidende Riemenschlupf nicht nur vergleichsweise klein ausfällt, sondern in einer praktisch linearen Abhängigkeit zur Leistung steht; der Umschlingungswinkel ändert sich auch bei Längung des Riemens praktisch nicht. Es ist daher mit einfachen Mitteln möglich, den genannten Schlupf rechnerisch auszugleichen und damit eine hohe Einstellgenauigkeit bezüglich der Bremskräfte zu erreichen, was vor allem bei programmgesteuerter Einstellung vorteilhaft ist.These measures advantageously result in a highly simple and inexpensive construction. The toothed tread pattern of the flat belt according to the invention not only results in extremely low-noise operation, but at the same time also ensures reliable transferability of high performance. In addition, the tread pattern also results in a reliable Belt guide so that it cannot run even under heavy use. In addition, the flat belt according to the invention enables the use of a comparatively small diameter of the brakeable pulley, with which a large, one-stage transmission ratio can be achieved with a compact design. This advantage is further supported by the fact that a large wrap angle can be achieved with the arrangement of the deflecting roller according to the invention, so that reliable power transmission is ensured even with a small pulley diameter and contact between the working strand and the empty strand is reliably avoided. Another, very special advantage of the measures according to the invention can also be seen in the fact that the belt slip which cannot be avoided is not only comparatively small, but is in a practically linear dependence on the power; the wrap angle practically does not change even when the belt is elongated. It is therefore possible with simple means to computationally compensate for the slip mentioned and thus achieve a high setting accuracy with regard to the braking forces, which is particularly advantageous in the case of program-controlled setting.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben. So kann die Umlenkrolle auf einem Schwenkhebel großer Länge aufgenommen sein, dessen zu den Achsen der Riemenscheibe parallele Schwenkachse zusammen mit der Achse der Umlenkrolle in der Spannstellung in einer bezüglich des Arbeitstrumms des Riemens etwa senkrecht stehenden Ebene liegt. Die kreisförmige Bewegungskurve der Umlenkrolle tangiert hierbei eine Parallele zum Arbeitstrumm des Riemens. Infolge der großen Länge des Schwenkhebels lassen sich daher trotz der pendelnden Aufhängung der Umlenkrolle ähnliche Verhältnisse erreichen wie im Falle einer Geradführung. Der erzielbare Umschlingungswinkel beträgt hier ebenfalls etwa 180°.Advantageous refinements and appropriate further training of the higher-level measures are specified in the subclaims. Thus, the deflection roller can be accommodated on a swivel lever of great length, the swivel axis parallel to the axes of the pulley, together with the axis of the deflection roller in the tensioned position, lying in a plane that is approximately perpendicular with respect to the working strand of the belt. The circular movement curve of the pulley affects a parallel to the belt's working run. Due to the large length of the swivel lever, similar conditions can be achieved as in the case of a straight guide, despite the oscillating suspension of the deflection roller. The wrap angle that can be achieved is also approximately 180 ° here.

Zweckmäßig kann die Länge des Schwenkhebels zumindest das 5-fache, vorzugsweise das 6-fache, des Radiusses der Umlenkrolle betragen. Hierbei ist die Krümmung der Bewegungskurve der Umlenkrolle praktisch nicht mehr spürbar. Der lange Schwenkhebel ist vorteilhaft an einem stehenden Holm des Gerätegestells gelagert, was auch bei pendelnder Aufhängung des Schwenkhebels eine große Schwenkhebellänge ermöglicht.The length of the pivot lever can expediently be at least 5 times, preferably 6 times, the radius of the deflection roller. The curvature of the movement curve of the deflection roller is practically no longer noticeable. The long swivel lever is advantageously mounted on a standing spar of the device frame, which enables a large swivel lever length even when the swivel lever is suspended.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, daß die vorzugsweise als Zugfeder ausgebildete Spannfeder etwa rechtwinklig zum Schwenkhebel angeordnet ist, womit sich übersichtliche Kraftverhältnisse ergeben.Another advantageous measure can consist in that the tension spring, which is preferably designed as a tension spring, is arranged approximately at right angles to the pivoting lever, which results in clear force relationships.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung in Verbindung mit den restlichen Unteransprüchen.Further advantageous refinements and expedient further developments of the higher-level measures result from the following description of an exemplary embodiment with reference to the drawing in conjunction with the remaining subclaims.

In der nachstehend beschriebenen Zeichnung zeigen:

Figur 1
eine schematische Seitenansicht eines erfindungsgemäßen Fahrradergonometers und
Figur 2
einen Teilradialschnitt durch eine Riemenscheibe mit aufgelegtem Riemen.
In the drawing described below:
Figure 1
is a schematic side view of a bicycle ergonomometer according to the invention and
Figure 2
a partial radial section through a pulley with a belt.

Das der Figur 1 zugrundeliegende Trainingsgerät in Form eines Fahrradergonometers enthält ein hier als Rohrkontruktion ausgebildetes Gestell mit einem unteren, zur Gewährleistung einer ausreichenden Standsicherheit seitlich ausladenden Standbalken 1 und einem hierauf befestigten Aufbau 2, der einen Sitz 3 und einen Haltebügel 4 trägt. Der Aufbau 2 ist mit einem unterhalb des Sitzes 3 angeordneten Tretlager 5 für eine Pedalanordnung 6 versehen, die von einer auf dem Sitz 3 platznehmenden Person betätigbar ist.The training device on which FIG. 1 is based, in the form of a bicycle ergonomometer, contains a frame designed here as a tube construction with a lower support beam 1 which laterally protrudes to ensure sufficient stability and a structure 2 fastened thereon, which carries a seat 3 and a holding bracket 4. The structure 2 is provided with a bottom bracket 5 arranged below the seat 3 for a pedal arrangement 6 which can be actuated by a person taking a seat on the seat 3.

Mit Hilfe der Pedalanordnung 6 ist eine auf dem Gestell angeordnete Bremseinrichtung 7, hier in Form eines auf den Standbalken 1 vor dem Aufbau 2 aufgesetzten Generators, antreibbar, durch welche die Leistung vernichtet wird, die von der trainierenden Person aufgebracht wird. Die so vernichtbare Leistung ist mittels einer im Sichtbereich der trainierenden Person angeordneten, hier am Haltebügel 4 befestigten Stell- und Anzeigeeinrichtung 8 einstellbar und anzeigbar. Hierzu ist die mittels einer Signalleitung 9 mit der Bremseinrichtung 7 verbundene Stell- und Anzeigeeinrichtung 8 mit einem manuell betätigbaren Einstellorgan 10, hier in Form eines mit einer Skala zusammenwirkenden Einstellknopfes, und einem Anzeigedisplay 11 versehen. Zusätzlich oder alternativ zur manuellen Einstellbarkeit kann die Stell- und Anzeigeeinrichtung 8 auch mit einer integrierten Programmsteuereinrichtung versehen sein, die einen erwünschten Verlauf der mittels der Bremseinrichtung 7 vernichtbaren Leistung vorgibt, wodurch beispielsweise natürliche Verhältnisse in Form von Berg- und Talfahrt und dergleichen, simulierbar sind.With the help of the pedal arrangement 6, a braking device 7 arranged on the frame, here in the form of a generator placed on the support beam 1 in front of the structure 2, can be driven, by means of which the power that is exercised by the training person is destroyed. The so destructible performance is in the field of view the training person arranged, here attached to the bracket 4 adjusting and display 8 adjustable and displayable. For this purpose, the setting and display device 8, which is connected to the braking device 7 by means of a signal line 9, is provided with a manually operable setting member 10, here in the form of an adjusting button cooperating with a scale, and a display 11. In addition or as an alternative to the manual adjustability, the setting and display device 8 can also be provided with an integrated program control device which specifies a desired course of the power which can be destroyed by the braking device 7, as a result of which, for example, natural conditions in the form of ascent and descent and the like can be simulated .

Zur Übertragung des Drehmoments von der Pedaleinrichtung 6 auf die Bremseinrichtung 7 ist ein einstufiger Riementrieb 12 vorgesehen, der so ausgebildet ist, daß sich trotz seiner einstufigen Bauart eine hohe Übersetzung von 1:15 bis 1:25, vorzugsweise 1:20 bis 1:22, ergibt. Hierzu ist auf die Welle 13 der Pedalanordnung 6 eine einen vergleichsweise großen Durchmesser aufweisende Riemenscheibe 14 aufgekeilt. Der Eingangswellenstummel des die Bremseinrichtung 7 bildenden Generators ist als weitere Riemenscheibe 15 vergleichsweise kleinen Durchmessers ausgebildet. Die durch die Pedalanordnung 6 antreibbare Riemenscheibe 14 großen Durchmessers und die durch die Bremseinrichtung 7 abbremsbare Riemenscheibe 15 kleineren Durchmessers sind durch einen endlosen Riemen 16 miteinander verbunden. Der Durchmesser der kleineren Riemenscheibe 15 kann 20mm betragen.To transmit the torque from the pedal device 6 to the braking device 7, a single-stage belt drive 12 is provided, which is designed such that, despite its single-stage design, a high gear ratio of 1:15 to 1:25, preferably 1:20 to 1:22 , results. For this purpose, a relatively large diameter pulley 14 is wedged onto the shaft 13 of the pedal arrangement 6. The input shaft stub of the generator forming the braking device 7 is designed as a further pulley 15 of comparatively small diameter. The pulley 14 of large diameter which can be driven by the pedal arrangement 6 and the pulley 15 of small diameter which can be braked by the braking device 7 are connected to one another by an endless belt 16 connected. The diameter of the smaller pulley 15 can be 20mm.

Der Riemen 16 ist, wie am besten aus Figur 2 erkennbar ist, als Flachriemen ausgebildet, der ein im Querschnitt dachförmig gezahntes Laufflächenprofil 17 aufweist. Es ergeben sich hier dementsprechend im Querschnitt dreieckförmige Stege bzw. Rillen. Wenigstens eine der beiden Riemenscheiben 14, 15 ist mit einem an das Laufflächenprofil 17 des Riemens 16 angepaßten Umfangsprofil 18 mit entsprechenden Rillen und Stegen versehen. In der Regel genügt es, wenn wenigstens die kleinere Riemenscheibe 15 das genannte Umfangsprofil 18 aufweist. Die größere Riemenscheibe 14 kann eine zylindrische Lauffläche aufweisen. Die genannte Profilierung des Riemens 16 und wenigstens der kleineren Riemenscheibe 15 gewährleistet eine zuverlässige Riemenführung und eine zuverlässige Leistungsübertragung mit geringem Schlupf. Dennoch ergibt sich auch bei kleinem Riemenscheibendurchmesser in der Größenordnung von 20mm ein schonender Riemenumlauf. Der erfindungsgemäße Riemen 16 vereinigt somit in sich die Vorteile von Flach- und Keilriemen und vermeidet die beiderseitigen Nachteile.The belt 16 is, as can best be seen from FIG. 2, in the form of a flat belt which has a tread profile 17 which is toothed in cross section in a roof shape. Accordingly, there are triangular webs or grooves in cross section. At least one of the two pulleys 14, 15 is provided with a circumferential profile 18 which is adapted to the tread profile 17 of the belt 16 and has corresponding grooves and webs. As a rule, it is sufficient if at least the smaller pulley 15 has the circumferential profile 18 mentioned. The larger pulley 14 can have a cylindrical tread. The mentioned profiling of the belt 16 and at least the smaller pulley 15 ensures reliable belt guidance and reliable power transmission with little slippage. Nevertheless, even with a small pulley diameter of the order of 20mm, there is a gentle belt circulation. The belt 16 according to the invention thus combines the advantages of flat and V-belts and avoids the mutual disadvantages.

Um trotz des kleinen, 20mm betragenden Durchmessers der Riemenscheibe 15 genügend Angriffsfläche für den Riemen 16 zu schaffen und damit die Leistungsübertragung weiter zu verbessern, ist der kleineren Riemenscheibe 15 eine Einrichtung 19 zur Vergrößerung des Umschlingungswinkels des Riemens 16 zugeordnet. Diese besteht aus einer in das von der antreibenden, größeren Riemenscheibe 14 ab- und auf die abbremsbare, kleinere Riemenscheibe 15 auflaufende Leertrumm des Riemens 16 eingreifenden, frei drehbar gelagerten Umlenkrolle 20. Diese kann mit seitlichen Führungsflanschen versehen sein. Die Umlenkrolle 20 wird durch eine zugeordnete Spannfeder 21 so beaufschlagt, daß das Leertrumm des Riemens 16 gegenüber dem durch eine gestrichelte Linie angedeuteten tangentialen Verlauf nach innen ausgelenkt wird. Die Umlenkrolle 20 ist dabei so angeordnet, daß der auf die kleinere Riemenscheibe 15 auflaufende Abschnitt des Riemen-Leertrumms etwa parallel zum von der Riemenscheibe 15 ablaufenden Abschnitt des Riemen-Arbeitstrumms verläuft und der Riemen 16 die kleinere Riemenscheibe 15 dementsprechend auf einem Winkel von 180° umschlingt. Hierzu kann die Umlenkrolle 20 auf einer etwa parallel zum Arbeitstrumm des Riemens 16 verlaufenden Längsführung verschiebbar gelagert sein. Im dargestellten Beispiel ist die Umlenkrolle 20 auf einem Schwenkhebel 22 aufgenommen, der an einem stehenden Holm des Aufbaus 2 pendelnd aufgehängt ist. Um dennoch ähnliche Verhältnisse wie bei einer Längsführung zu bewerkstelligen, besitzt der Schwenkhebel 22, d.h. der Abstand zwischen seiner Schwenkachse und der Achse der Umlenkrolle 20, eine bezüglich der Größe der Umlenkrolle 20 vergleichsweise große Länge von mindestens dem 5-fachen, vorzugsweise dem 7- bis 9-fachen wirksamen Umlenkrollen-Radius. Der Durchmesser der Umlenkrolle 20 kann 40-50mm betragen. Zudem ist das Schwenklager 23 des Schwenkhebels 22 so plaziert, daß sich die Schwenkachse des Schwenkhebels 22 und die Achse der Umlenkrolle 20 in einer gemeinsamen Ebene befinden, die bezüglich des Arbeitstrumms des Riemens 16 senkrecht steht. Die Länge des Riemens 16 ist dementsprechend so bemessen, daß sich in der der Figur 1 zugrundeliegenden Spannstellung eine gegenüber dem gestrichelt angedeuteten, tangentialen Verlauf rechtwinklige Riemenauslenkung nach innen ergeben kann. Diese tiefe Riemenauslenkung erleichtert auch die zum Arbeitstrumm und zum hierzu parallelen Abschnitt des Leertrumms des Riemens 16 etwa senkrechte Anordnung des Schwenkhebels 22 ohne zu einer unerwünscht großen Länge des Schwenkhebels 22 zu führen.In order to create sufficient contact surface for the belt 16 despite the small, 20 mm diameter of the pulley 15 and thus to further improve the power transmission, the smaller pulley 15 is assigned a device 19 for increasing the wrap angle of the belt 16. This consists of a in and out of the driving, larger pulley 14 freely rotatably mounted deflection roller 20 which engages on the braked, smaller pulley 15 and runs freely on the belt 16. This can be provided with lateral guide flanges. The deflection roller 20 is acted upon by an associated tension spring 21 in such a way that the empty run of the belt 16 is deflected inward in relation to the tangential course indicated by a dashed line. The deflection roller 20 is arranged such that the portion of the belt run that runs onto the smaller pulley 15 runs approximately parallel to the section of the belt working run that runs from the pulley 15 and the belt 16 the smaller pulley 15 accordingly at an angle of 180 ° wraps around. For this purpose, the deflection roller 20 can be slidably mounted on a longitudinal guide running approximately parallel to the working run of the belt 16. In the example shown, the deflection roller 20 is received on a pivot lever 22 which is suspended in a pendulum manner on a standing spar of the structure 2. In order to nevertheless achieve conditions similar to a longitudinal guide, the pivot lever 22, ie the distance between its pivot axis and the axis of the deflection roller 20, has a length of at least 5 times, preferably 7-, which is comparatively large with respect to the size of the deflection roller 20. up to 9 times the effective deflection roller radius. The diameter of the deflection roller 20 can be 40-50mm. In addition, the pivot bearing 23 of the pivot lever 22 is placed so that the pivot axis of the pivot lever 22 and the axis of the deflection roller 20 are in a common plane which is perpendicular to the working strand of the belt 16. The length of the belt 16 is accordingly dimensioned so that in the tensioning position on which FIG. 1 is based, a belt deflection which is at right angles to the tangential course indicated by dashed lines can result inwards. This deep belt deflection also facilitates the arrangement of the pivot lever 22 which is approximately perpendicular to the working strand and the section of the empty strand of the belt 16 parallel thereto, without leading to an undesirably large length of the pivot lever 22.

Am Schwenkhebel 22 greift die in Auslenkrichtung vorgespannte Spannfeder 21 an. Diese ist hier als Zugefeder mit vergleichsweise weicher Federcharakteristik, also geringer Federkonstante, ausgebildet, so daß die hiervon ausgeübte Federkraft innerhalb geringer Federwege praktisch konstant ist. Die Spannfeder 21 ist hier so angeordnet, daß die Federachse etwa senkrecht zur Schwenkhebelachse verläuft, wodurch die Schwankung der Federlänge minimiert wird. Die Spannfeder 21 greift einerseits an der Achse 24 der Umlenkrolle 20 und andererseits an einem am Standbalken 1 befestigten Haltebolzen 25 an. Hierzu sind die Enden der Spannfeder 21 als Einhängklauen ausgebildet.The tension spring 21, which is pretensioned in the deflection direction, acts on the swivel lever 22. This is designed as a spring with a comparatively soft spring characteristic, that is to say a low spring constant, so that the spring force exerted thereby is practically constant within a small spring travel. The tension spring 21 is arranged here so that the spring axis extends approximately perpendicular to the pivot lever axis, whereby the fluctuation in the spring length is minimized. The tension spring 21 engages on the one hand on the axis 24 of the deflection roller 20 and on the other hand on a retaining bolt 25 fastened to the support beam 1. For this purpose, the ends of the tension spring 21 are designed as suspension claws.

Claims (10)

  1. Training apparatus, more especially a cycle ergonometer, having a belt (16) which is guided around a pulley (14), preferably drivable by pedals, and a pulley (15), preferably retardable by means of a generator, the end portion of said belt travelling up and down the retardable smaller pulley (15) from the drivable larger pulley (14) and being inwardly deflectable relative to a tangential configuration by means of a freely rotatably mounted guide roller (20) which can be acted upon by means of at least one tension spring (21) in the direction of deflection, characterised in that the belt (16) is configured as a flat belt comprising a travel face profile (17) with a toothed cross-section, and at least one pulley (15) has a corresponding circumferential profile (18), and in that the guide roller (20), the tension spring (21) of which has a minimal resilient constant, is displaceable with its axis along a guide path, the distance of which from the working end of the belt (16) corresponds substantially to the sum of the diameter of the retardable pulley (15) and the radius of the guide roller (20) plus the belt thickness.
  2. Training apparatus according to claim 1, characterised in that the guide roller (20) is taken-up on a pivot lever (22) of great length, the pivot axis of said lever extending parallel to the axes of the pulleys (14, 15) and, together with the axis of the guide roller (20), lying in a plane substantially perpendicular relative to the working end of the belt (16).
  3. Training apparatus according to claim 2, characterised in that the length of the pivot lever (22) amounts to at least 5 times the radius of the guide roller (20), and preferably corresponds to 7 to 9 times the radius.
  4. Training apparatus according to one of the preceding claims 2 or 3, characterised in that the pivot lever (22) is mounted on an upright strut of the apparatus frame (1, 2).
  5. Training apparatus according to one of the preceding claims 2 to 4, characterised in that the tension spring (21) is disposed substantially at right angles to the pivot lever (22).
  6. Training apparatus according to one of the preceding claims, characterised in that the tension spring (21), which is preferably configured as a torsion spring, is pivotally mounted, at one end, on the axis (24) of the guide roller (20) and, at the other end, on a retaining bolt (25) on the frame side.
  7. Training apparatus according to one of the preceding claims, characterised in that at least the smaller pulley (15), preferably only this one, has a circumferential profile (18) adapted to the travel face profile (17) of the belt (16).
  8. Training apparatus according to one of the preceding claims, characterised in that a setting and display arrangement (8), which is preferably provided with a programme controlling arrangement, is associated with the braking arrangement (7).
  9. Training apparatus according to one of the preceding claims, characterised in that the smaller pulley (15) has a diameter of 20 mm.
  10. Training apparatus according to one of the preceding claims, characterised in that the guide roller (20), which is preferably provided with lateral guide flanges, has a diameter of 40 mm.
EP93102187A 1992-03-13 1993-02-12 Exercise apparatus Expired - Lifetime EP0560073B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4207992 1992-03-13
DE4207992A DE4207992C2 (en) 1992-03-13 1992-03-13 Training device

Publications (2)

Publication Number Publication Date
EP0560073A1 EP0560073A1 (en) 1993-09-15
EP0560073B1 true EP0560073B1 (en) 1996-04-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102187A Expired - Lifetime EP0560073B1 (en) 1992-03-13 1993-02-12 Exercise apparatus

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EP (1) EP0560073B1 (en)
DE (2) DE4207992C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4412017C1 (en) * 1994-04-07 1995-11-30 Keiper Dynafit Ergometer with pivot mounted brake disc
DE19930406B4 (en) * 1999-07-02 2006-08-10 Reck, Anton Movement device with two actuators for a pair of extremities of a person
CN108939411B (en) * 2018-07-02 2024-05-03 江苏康力源体育科技股份有限公司 Automatic tightening device for running belt
CN111513981B (en) * 2020-04-17 2021-10-08 合肥工业大学 Passive rehabilitation mechanism of low limbs

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR927986A (en) * 1946-04-27 1947-11-14 Belt drive improvements
FR2256709A5 (en) * 1973-12-27 1975-07-25 Brisard Gerard Apparatus to measure force developed by cyclist - incorporates a dynamometer and indicators for pedal couple force and speed
US4705493A (en) * 1986-09-08 1987-11-10 Shinn Fu Corporation Transmission mechanism for gymnastic bicycle
US4953850A (en) * 1989-09-27 1990-09-04 Lo Peter K Wind-drag type exercise bicycle with pedals disposed in front of the seat thereof
DE9014326U1 (en) * 1990-10-16 1990-12-20 Keiper Dynavit GmbH & Co, 6750 Kaiserslautern Belt drives, especially for sports equipment and sports medicine and medical equipment

Also Published As

Publication number Publication date
DE4207992C2 (en) 1994-03-31
DE4207992A1 (en) 1993-09-16
EP0560073A1 (en) 1993-09-15
DE59302311D1 (en) 1996-05-30

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