US3442131A - Ergometer - Google Patents

Ergometer Download PDF

Info

Publication number
US3442131A
US3442131A US559201A US3442131DA US3442131A US 3442131 A US3442131 A US 3442131A US 559201 A US559201 A US 559201A US 3442131D A US3442131D A US 3442131DA US 3442131 A US3442131 A US 3442131A
Authority
US
United States
Prior art keywords
ergometer
disc
pedal
frequency
braking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US559201A
Other languages
English (en)
Inventor
Johannes Leyten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gebr Mynhardt Cv
MIJNHARDT C V GEB
Original Assignee
MIJNHARDT C V GEB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MIJNHARDT C V GEB filed Critical MIJNHARDT C V GEB
Application granted granted Critical
Publication of US3442131A publication Critical patent/US3442131A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
    • H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
    • H02K49/046—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with an axial airgap
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
    • A61B5/221—Ergometry, e.g. by using bicycle type apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/16—Rotary-absorption dynamometers, e.g. of brake type
    • G01L3/22—Rotary-absorption dynamometers, e.g. of brake type electrically or magnetically actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S482/00—Exercise devices
    • Y10S482/903—Utilizing electromagnetic force resistance

Definitions

  • the brakmg device may be of the eddy current disc type.
  • This invention relates to an ergometer for measuring human physical capacity, of the type in which a person under observation should make a circular treadle movement, the treadle energy being taken up into a braking device.
  • a known ergometer of this type in which the energy is is constructed in such a way that in the range of the normal pedal frequency the braking torque is inversely proportional to the number of revolutions per unit time, consequently the energy taken up by the brake and produced by the person under observation is constant at an alternating pedal frequency.
  • ThlS structure is, however, disadvantageous in that the patient, in spite of the fact that the energy to be given off does not depend on pedal frequency or angular frequency, has the impression that at an increasing frequency he should produce a lesser amount of work, while at a decreasing frequency the apparatus seems to run heavier.
  • Another object of the invention is to provide an ergometer wherein said most efiicient action of the metabolism is automatically obtained for any investigated patient.
  • Another object is to obtain a precise measurement, independent of variations of the pedal frequency during the test.
  • FIGURE 2 shows experimentally determined capacity characteristics obtained by measurements on a large number of persons
  • FIGURE 3 represents in outline partially in section, an embodiment of an ergometer according to the invention.
  • the braking torque exerted by a braking device is inversely proportional to the number of treadle revolutions per unit time.
  • This construction was chosen in order that the energy produced by the patient, and absorbed by the braking device, should 'be independent of the angular frequency, since the energy is the product of the number of revolutions and the torque, or the capacity is the product of angular frequency and torque.
  • the braking torque was adjusted by adjusting the energizing current of the electromagnet.
  • the resistance torque of the braking device should be chosen such that in the range of the normal pedal frequencies it varies in the same sense as the pedal frequency.
  • the device will be experienced as more natural: the higher the pedal frequency, the higher the power to be produced by the patient.
  • the disadvantage of the prior device premature ending of the test because of the required too great physical and psychological effort after a slight decrease of the frequency-is obviated.
  • the said linear relationship between the braking torque and the pedal frequency can for example be obtained by any mechanical braking mechanism, wherein the braking force is controlled electronically by the angular frequency of the pedal shaft. 1 have, however, realised that said linear relationship can also be obtained with the known eddy current brake. To explain this, reference is made to FIG. 1, showing a series of torque characteristics of eddy current discs, the magnetic field intensities being the parameter.
  • FIGURE 1 shows also that in the range of the lower frequencies of eddy current discs there is a linear relationship between the braking torque K and N According to my invention one works exclusively in the linear area, which is practically bounded by the dotted line A. This means that simply the transmission ratio between the pedal shaft and the eddy current disc has to be chosen at a lower value than in the known device.
  • FIGURE 2 shows the result of medical investigations with several patients of various ages and physical strength; it represents the quadratic relationship between the energy produced P, and the pedal frequency N, which corresponds with the most eflicient action of the patients metabolism.
  • Any of the parabolic curves of FIG. 2 is related with any of the linear curve portions of FIG. 1 by a definite value of the transmission ratio between the pedals and the eddy current disc.
  • FIGURE 3 shows a frame structure with an encasement 1, in which is incorporated a pedal shaft 2 with pedals 4 mounted on cranks 3, and on which is mounted a saddle 5 and a bicycle handle-bar 6.
  • An eddy current disc 7 is mounted on the pedal shaft, the said disc being embraced by two permanent magnets 8 and 9.
  • a travelling wheel 10 of a speedometer 11 Between the magnets is a travelling wheel 10 of a speedometer 11. Since according to the invention there is a fixed relation between the circumferential speed of the eddy current disc at the location of the magnets and the energy absorbed by the eddy current disc, the speedometer 11 may directly be gauged in power units such as watts.
  • the two magnets and the travelling wheel are jointly mounted on a sledge 12, which in respect of the disc 7 is adjustable in radial direction by means of a handle 13.
  • the cable 14 of the speedometer is flexible.
  • an indicator 15 of the number of revolutions per unit time which instrument may be readable on both sides, and of which the travelling wheel 16 runs against the disc 7.
  • the speedometer 11 is readjusted automatically so that the indication of the capacity remains correct.
  • the invention provides an efficient and also simple and cheap apparatus in which non-registered friction losses are reduced to a minimum, and with which measurements can be performed under optimum conditions so that the results are dependable to a high degree.
  • An ergometer comprising:
  • a braking means including:
  • (II) means for applying a braking torque to said element which varies with variations in speed of said element
  • (b) means adapted to be rotated by a patient being tested
  • An ergometer as defined in claim 1 including means for adjusting the braking torque applied to said element (a) (I) by said means (a) (II).
  • An ergometer as defined in claim 3 wherein said means for providing a magnetic field includes a permanent magnet adjacent to said disc.
  • An ergometer as defined in claim 6 including means for adjusting the position of said permanent magnet in a radial direction with respect to said disc to adjust the braking torque on said disc as a result of said magnet.
  • An ergometer as defined in claim 3 including a speedometer having an indicator graduated in units of power, and means engaging said disc for transmitting the movement of the latter to said indicator.
  • An ergometer as defined in claim 7 including a speedometer having an indicator, follower means engaging a face of said disc for transmitting the movement of the latter to said indicator, said follower means being coupled to said adjusting means for moving said follower means together with said magnet radially with respect to said disc.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Medical Informatics (AREA)
  • Power Engineering (AREA)
  • Biophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
US559201A 1965-06-25 1966-06-21 Ergometer Expired - Lifetime US3442131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6508252A NL124727C (fr) 1965-06-25 1965-06-25

Publications (1)

Publication Number Publication Date
US3442131A true US3442131A (en) 1969-05-06

Family

ID=19793499

Family Applications (1)

Application Number Title Priority Date Filing Date
US559201A Expired - Lifetime US3442131A (en) 1965-06-25 1966-06-21 Ergometer

Country Status (4)

Country Link
US (1) US3442131A (fr)
DE (1) DE1541145B2 (fr)
FR (1) FR1505384A (fr)
NL (1) NL124727C (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589193A (en) * 1969-07-24 1971-06-29 William E Thornton Ergometer
US3831942A (en) * 1973-02-13 1974-08-27 Del Mar Eng Lab Portable exercise machine
EP0081189A2 (fr) * 1981-12-05 1983-06-15 Karl-Heinz Linnig Dispositif de freinage d'objets
EP0176962A2 (fr) * 1984-09-26 1986-04-09 Tsunoda Jitensha Kabushiki Kaisha Appareil d'exercice pour le pas
EP0193286A2 (fr) * 1985-02-15 1986-09-03 Cateye Co., Ltd. Dispositif pour appliquer une charge
US4798378A (en) * 1985-07-15 1989-01-17 Jones Robert S Rowing machine
US4826150A (en) * 1986-02-20 1989-05-02 Minoura Carrier & Stand Works Co., Ltd. Resistance applying means for exercising apparatus
US5205801A (en) * 1990-03-29 1993-04-27 The Scott Fetzer Company Exercise system
USRE34479E (en) * 1986-02-20 1993-12-14 Minoura Carrier & Stand Works Co., Ltd. Resistence applying means for exercising apparatus
US5916068A (en) * 1997-08-25 1999-06-29 Chisholm; Philip Variable resistance device
US6361479B1 (en) 1998-09-29 2002-03-26 Nustep, Inc. Recumbent total body exerciser

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2424015C2 (de) * 1974-05-17 1982-08-12 Robert Bosch Gmbh, 7000 Stuttgart Ergometer
DE2608313C2 (de) * 1976-02-28 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart Ergometer
DE3603854A1 (de) * 1986-02-07 1987-08-20 Seca Gmbh Ergometer, insbesondere fahrrad-ergometer
US5712520A (en) * 1993-05-21 1998-01-27 Magna Force, Inc. Permanent magnet braking system
EP1518588A1 (fr) * 2003-09-23 2005-03-30 Daum GmbH & Co. KG Appareil d'entraínement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL65391C (fr) *
US2784591A (en) * 1955-07-25 1957-03-12 Bernard A Shoor Cycle ergometer
US2886302A (en) * 1956-10-24 1959-05-12 B I F Ind Inc Scale beam sensitivity control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL65391C (fr) *
US2784591A (en) * 1955-07-25 1957-03-12 Bernard A Shoor Cycle ergometer
US2886302A (en) * 1956-10-24 1959-05-12 B I F Ind Inc Scale beam sensitivity control

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589193A (en) * 1969-07-24 1971-06-29 William E Thornton Ergometer
US3831942A (en) * 1973-02-13 1974-08-27 Del Mar Eng Lab Portable exercise machine
EP0081189A2 (fr) * 1981-12-05 1983-06-15 Karl-Heinz Linnig Dispositif de freinage d'objets
EP0081189A3 (en) * 1981-12-05 1984-10-03 Karl-Heinz Linnig Object braking device
US4752066A (en) * 1984-09-26 1988-06-21 Tsunoda Jitensha Kabushiki Kaisha Footstep exerciser
EP0176962A3 (en) * 1984-09-26 1986-08-20 Tsunoda Jitensha Kabushiki Kaisha Footstep exerciser
EP0176962A2 (fr) * 1984-09-26 1986-04-09 Tsunoda Jitensha Kabushiki Kaisha Appareil d'exercice pour le pas
US4775145A (en) * 1985-02-02 1988-10-04 Tsuyama Mfg. Company, Ltd. Load applying means for an exercise device
EP0193286A2 (fr) * 1985-02-15 1986-09-03 Cateye Co., Ltd. Dispositif pour appliquer une charge
EP0193286A3 (en) * 1985-02-15 1987-07-01 Cateye Co Ltd Load applying device
US4798378A (en) * 1985-07-15 1989-01-17 Jones Robert S Rowing machine
US4826150A (en) * 1986-02-20 1989-05-02 Minoura Carrier & Stand Works Co., Ltd. Resistance applying means for exercising apparatus
USRE34479E (en) * 1986-02-20 1993-12-14 Minoura Carrier & Stand Works Co., Ltd. Resistence applying means for exercising apparatus
US5205801A (en) * 1990-03-29 1993-04-27 The Scott Fetzer Company Exercise system
US5916068A (en) * 1997-08-25 1999-06-29 Chisholm; Philip Variable resistance device
US6361479B1 (en) 1998-09-29 2002-03-26 Nustep, Inc. Recumbent total body exerciser

Also Published As

Publication number Publication date
NL124727C (fr) 1968-08-15
DE1541145A1 (de) 1969-10-09
NL6508252A (fr) 1966-12-27
FR1505384A (fr) 1967-12-15
DE1541145B2 (de) 1976-07-08

Similar Documents

Publication Publication Date Title
US3442131A (en) Ergometer
CA2697297C (fr) Appareil d'entrainement ergometrique
US5165278A (en) Cycle ergometer
EP1040852B1 (fr) Installation de freinage pour ergomètre magnétique ou électrique
US3831942A (en) Portable exercise machine
US4047715A (en) Friction type ergometer apparatus
US5027303A (en) Measuring apparatus for pedal-crank assembly
US5081991A (en) Methods and apparatus for using nuclear magnetic resonance to evaluate the muscle efficiency and maximum power of a subject during locomotion
EP3402579B1 (fr) Dispositif d'exercice ergométrique stationnaire
Harrison Maximizing human power output by suitable selection of motion cycle and load
JPH0387624A (ja) 駆動トルク測定装置
WO1997026948A1 (fr) Appareil d'exercice monopedale
Van Praagh et al. A simple calibration method for mechanically braked cycle ergometers
US4647036A (en) Energy measurement enabling apparatus
DE3486014T2 (de) Verfahren zum erhalten eines optimalen belastungswertes fuer einen uebungsgeraetbenutzer.
Vandewalle et al. Friction-loaded cycle ergometers: past, present and future
US20210361994A1 (en) Exercise machine with a variable load provided by an electric motor
JPS4862146A (fr)
US5042794A (en) Load applying device for an exercise bicycle
FI71428C (fi) Momentmaetningsanordning foer en cykelergometer
DE19601194C2 (de) Verfahren zur Ansteuerung eines Hilfsantriebs eines Fahrrads in Abhängigkeit von dem von einem Fahrradfahrer abgegebenen Drehmoment
Clark et al. Electronic bicycle ergometer: a simple calibration procedure.
Atkins et al. An accurate constant-work-rate ergometer
JPH0739606A (ja) 運動負荷装置
Williams et al. Short-term power output in 9-year-old children: typical error between ergometers and protocols