EP2659936A1 - Freewheel structure - Google Patents
Freewheel structure Download PDFInfo
- Publication number
- EP2659936A1 EP2659936A1 EP12166800.8A EP12166800A EP2659936A1 EP 2659936 A1 EP2659936 A1 EP 2659936A1 EP 12166800 A EP12166800 A EP 12166800A EP 2659936 A1 EP2659936 A1 EP 2659936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- locking
- freewheel
- wheel frame
- weight
- 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.)
- Withdrawn
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Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B21/00—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
- A63B21/22—Resisting devices with rotary bodies
- A63B21/225—Resisting devices with rotary bodies with flywheels
Definitions
- the present invention relates to a freewheel structure.
- Fig. 1 shows a conventional stationary exercise.
- the frame 90 is provided with a freewheel 2.
- the other end of the frame 90 is provided with a crank unit 95 which is used to drive the freewheel 2.
- the user pedals the crank unit 95 to drive the freewheel 2 having a certain weight and to generate a load through a friction pad, a brake pad or a magnetic control member.
- the freewheel is called acceleration movement.
- the crank at one side is turned to the lowermost position, one course of thrust augmentation by left and right legs is completed.
- the crank continues to turn by inertial force of the freewheel.
- the crank goes the next course.
- the conventional freewheel is a solid stainless steel wheel.
- a stainless post having a larger diameter is required to cut and molding. The larger diameter is, the high cost will be. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.
- the primary object of the present invention is to provide a freewheel structure which can obviously elongate the curve of inertial weight without increasing the weight of the freewheel so as to enhance the exercise effect of an exercise apparatus.
- Another object of the present invention is to provide an adjustable freewheel structure.
- the weight of the freewheel can be adjusted as desired to change the curve of inertial weight for different users.
- the freewheel structure of the present invention comprises a wheel frame and a plurality of weight blocks.
- the wheel frame has a central axle portion and a flange portion around an outer edge thereof.
- the wheel frame further has a plurality of wheel arms formed between the axle portion and the flange portion. The wheel arms radially extend from the axle portion and are equally spaced.
- Each of the wheel arms has at least one first locking portion thereon.
- Each weight block has a second locking portion corresponding to the first locking portion of the corresponding wheel arm.
- the inertial effect of the present invention can be enhanced when the rotational speed is increasing progressively and the curve of inertial weight is elongated obviously.
- the cost of the freewheel is reduced effectively.
- the freewheel 1 of the present invention is mounted on the frame 60 of a stationary exercise bicycle.
- the frame 60 is provided with a crank unit 65 for the user to pedal.
- the rank unit 65 and the freewheel 1 on the frame 60 can be coaxial or not coaxial.
- the user can pedal the crank unit 65 to bring the freewheel 1 to rotate at a high speed.
- two cranks at both sides of the crank unit 65 can be turned smoothly.
- the freewheel 1 comprises a disk-shaped wheel frame 10 and a plurality of weight blocks 20.
- the wheel frame 10 has a central axle portion 11 for insertion of an axle member 50. Through the axle member 50, the freewheel 1 is mounted on the frame 60 of the stationary exercise bicycle.
- the wheel frame 10 has a flange portion 12 around an outer edge thereof.
- the wheel frame 10 further has a plurality of wheel arms 15 formed between the axle portion 11 and the flange portion 12.
- the wheel arms 15 radially extend from the axle portion 11 and are equally spaced.
- the present invention has six wheel arms 15. At least one of two side walls of each wheel arm 15 is formed with a limit portion 16. In this embodiment, the two side walls of each wheel arm 15 are formed with the limit portion 16.
- Each wheel arm 15 has a first locking portion 18 formed within the limit portion 16 for connection of the corresponding weight block 20.
- the distance between the first locking portion 18 and the axle portion 11 is greater than a half of the radius of the wheel frame 10.
- the first locking portion 18 can be one of a through hole, a threaded hole, a threaded post and a protruding post.
- the first locking portion 18 is a through hole for connection of the corresponding weight block 20.
- Each weight block 20 can have a different weight and size as desired.
- the weight of each weight block 20 is one kilogram for the user to count the weight conveniently.
- Each weight block 20 has a second locking portion 21 corresponding to the first locking portion 18 of the corresponding wheel arm 15.
- the second locking portion 21 is a through hole.
- the weight blocks 20 at two sides of each wheel arm 15 of the wheel frame 10 are fixed within the two limit portions 16 with a locking member 25 so as to lighten the bearing stress of the locking member 25.
- the freewheel 1 further comprises a wheel ring 30 fitted on the outer edge of the wheel frame 10.
- the wheel ring 30 has a plurality of spaced locking pieces 31 on an inner edge thereof. Through the locking pieces 31, the wheel ring 30 is fixed to the flange portion 12 of the wheel frame 10.
- the wheel ring 30 is a metallic ring and functions as the surface of a magnetic control member, a friction pad or a brake pad.
- the freewheel 1 comprises at least one wheel hub 40 disposed at either of the two sides of the wheel frame 10.
- the freewheel 1 comprises two wheel hubs 40 at the two sides of the wheel frame 10.
- the wheel hub 40 is made of a colorful and transparent material, so that the user won't touch the parts inside the freewheel 10 and can see the inner configuration through the transparent wheel hub 40.
- the colorful and transparent wheel hub 40 will create streamline and rotational change to enhance its appearance.
- the user pedals the crank unit 65 to drive the freewheel 1.
- the weight blocks 20 on the freewheel 1 keep a certain distance relative to the axle portion 11 of the wheel frame 10, so the freewheel 1 will generate a greater centrifugal force when it is rotated at a high speed.
- the longer distance between the same weight block 20 and the axle portion 11 is, the greater centrifugal force will be.
- the distance between the first locking portion 18 of the weight block 20 and the axle portion 11 is greater a half of the radius of the wheel frame 10.
- the limit portions 16 at both sides of each wheel arm 15 of the wheel frame 10 of the freewheel 1 are provided with the weight blocks 20 as desired.
- the weight blocks 20 can be decreased.
- the weight blocks 20 are spaced at intervals to lighten the whole weight of the freewheel 1 so as to have the same inertial effect as the conventional freewheel.
- the weight of the freewheel 1 of the present invention can be adjusted as desired.
- Fig. 8 and Fig. 9 show another embodiment of the present invention.
- the wheel frame 10 further has a plurality of wheel arms 15 formed between the axle portion 11 and the flange portion 12.
- the wheel arms 15 radially extend from the axle portion 11 and are equally spaced.
- Each wheel arm 15 is formed with an elongated guide portion 17.
- the elongated guide portion 17 has a plurality of first locking portions 18 which have different distances relative to the axle portion 11.
- the elongated guide portion 17 is a slot.
- the first locking portions 18 are recesses formed at one side of the slot.
- the weight block 20 can be moved along the elongated guide portion 17 and locked to a desired first locking portion 18 to change the distance between the weight block 20 and the axle portion 11, as shown in Fig. 9 .
- the freewheel 1 of the present invention can be mounted on an oval frame 70.
- the frame 70 is provided with a pair of handles 71 which can be operated in an interlaced movement.
- the frame 70 is provided with a pair of pedal units 75 which are disposed at both sides of the frame 70 and linked by the handles 71.
- the pedal units 75 are pivotally connected to both sides of the freewheel 1 through link rods 76 to generate inertial and load.
- the freewheel of the present invention has the following advantages and is very practical.
- the freewheel structure of the present invention uses the rotational centrifugal force of the weight blocks 20 which keep a certain distance relative to the axle portion 11 to generate the inertial effect. Compared to the solid freewheel, the freewheel of the present invention has greater centrifugal force. With the same weight, the curve of inertial weight is elongated obviously to enhance the exercise effect of the exercise apparatus.
- the freewheel structure of the present invention uses small weight blocks 20 to enhance the inertial weight. Compared to the large solid freewheel, the present invention has less material cost than the prior art and the processing apparatus is a normal one, so the manufacture cost can be reduced greatly.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biophysics (AREA)
- Orthopedic Medicine & Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
A freewheel structure includes a wheel frame and at least one weight block. The wheel frame has a central axle portion and a flange portion around an outer edge thereof. The axle portion is for insertion of an axle member. The weight block is selectively located between the axle portion and the flange portion, so that the weight block has a certain distance relative to axle portion. The freewheel will generate a greater centrifugal force when it is rotated at a high speed. The inertial effect of the present invention can be enhanced when the rotational speed is increasing progressively, so the curve of inertial weight is elongated obviously. The whole weight of the freewheel is reduced effectively.
Description
- The present invention relates to a freewheel structure.
-
Fig. 1 shows a conventional stationary exercise. Theframe 90 is provided with afreewheel 2. The other end of theframe 90 is provided with acrank unit 95 which is used to drive thefreewheel 2. The user pedals thecrank unit 95 to drive thefreewheel 2 having a certain weight and to generate a load through a friction pad, a brake pad or a magnetic control member. The freewheel is called acceleration movement. When the crank at one side is turned to the lowermost position, one course of thrust augmentation by left and right legs is completed. The crank continues to turn by inertial force of the freewheel. When passing the lowermost position, the crank goes the next course. - When the freewheel is driven, the weight of the freewheel is used for elongating the curve of the inertial weight and balancing resistance, so the freewheel must have a certain weight to generate an effective curve of the inertial weight. The conventional freewheel is a solid stainless steel wheel. For manufacture, a stainless post having a larger diameter is required to cut and molding. The larger diameter is, the high cost will be. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.
- The primary object of the present invention is to provide a freewheel structure which can obviously elongate the curve of inertial weight without increasing the weight of the freewheel so as to enhance the exercise effect of an exercise apparatus.
- Another object of the present invention is to provide an adjustable freewheel structure. The weight of the freewheel can be adjusted as desired to change the curve of inertial weight for different users.
- In order to achieve the aforesaid objects, the freewheel structure of the present invention comprises a wheel frame and a plurality of weight blocks. The wheel frame has a central axle portion and a flange portion around an outer edge thereof. The wheel frame further has a plurality of wheel arms formed between the axle portion and the flange portion. The wheel arms radially extend from the axle portion and are equally spaced. Each of the wheel arms has at least one first locking portion thereon. Each weight block has a second locking portion corresponding to the first locking portion of the corresponding wheel arm.
- By using the distance between the weight blocks and the axle portion as the length of the torque, the inertial effect of the present invention can be enhanced when the rotational speed is increasing progressively and the curve of inertial weight is elongated obviously. The cost of the freewheel is reduced effectively.
-
-
Fig. 1 is a perspective view of a conventional stationary exercise bicycle; -
Fig. 2 is a perspective view of the stationary exercise bicycle of the present invention; -
Fig. 3 is an exploded view of the freewheel structure of the present invention; -
Fig. 4 is a perspective view of the freewheel structure of the present invention; -
Fig. 5 is a sectional view taken along line 5-5 ofFig. 4 ; -
Fig. 6 is a side view of the freewheel structure of the present invention; -
Fig. 7 is a side view of the freewheel structure with fewer weight blocks of the present invention; -
Fig. 8 is a side view of the freewheel structure of another embodiment of the present invention; -
Fig. 9 is a side view showing the weight blocks in a different position of the freewheel structure of another embodiment of the present invention; and -
Fig. 10 is a schematic view showing the freewheel structure of the present invention applied to another stationary exercise bicycle. - Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
- As shown in
Fig. 2 , thefreewheel 1 of the present invention is mounted on theframe 60 of a stationary exercise bicycle. Theframe 60 is provided with acrank unit 65 for the user to pedal. Therank unit 65 and thefreewheel 1 on theframe 60 can be coaxial or not coaxial. The user can pedal thecrank unit 65 to bring thefreewheel 1 to rotate at a high speed. Through the inertial effect of thefreewheel 1, two cranks at both sides of thecrank unit 65 can be turned smoothly. -
Fig. 3 through Fig. 6 show a preferred embodiment of the present invention. Thefreewheel 1 comprises a disk-shaped wheel frame 10 and a plurality ofweight blocks 20. - The
wheel frame 10 has acentral axle portion 11 for insertion of anaxle member 50. Through theaxle member 50, thefreewheel 1 is mounted on theframe 60 of the stationary exercise bicycle. Thewheel frame 10 has aflange portion 12 around an outer edge thereof. Thewheel frame 10 further has a plurality ofwheel arms 15 formed between theaxle portion 11 and theflange portion 12. Thewheel arms 15 radially extend from theaxle portion 11 and are equally spaced. In this embodiment, the present invention has sixwheel arms 15. At least one of two side walls of eachwheel arm 15 is formed with alimit portion 16. In this embodiment, the two side walls of eachwheel arm 15 are formed with thelimit portion 16. Eachwheel arm 15 has afirst locking portion 18 formed within thelimit portion 16 for connection of thecorresponding weight block 20. The distance between thefirst locking portion 18 and theaxle portion 11 is greater than a half of the radius of thewheel frame 10. Thefirst locking portion 18 can be one of a through hole, a threaded hole, a threaded post and a protruding post. In this embodiment, thefirst locking portion 18 is a through hole for connection of thecorresponding weight block 20. - Each
weight block 20 can have a different weight and size as desired. For example, the weight of eachweight block 20 is one kilogram for the user to count the weight conveniently. Eachweight block 20 has asecond locking portion 21 corresponding to thefirst locking portion 18 of thecorresponding wheel arm 15. In this embodiment, thesecond locking portion 21 is a through hole. The weight blocks 20 at two sides of eachwheel arm 15 of thewheel frame 10 are fixed within the twolimit portions 16 with a lockingmember 25 so as to lighten the bearing stress of the lockingmember 25. - The
freewheel 1 further comprises awheel ring 30 fitted on the outer edge of thewheel frame 10. Thewheel ring 30 has a plurality of spaced lockingpieces 31 on an inner edge thereof. Through the lockingpieces 31, thewheel ring 30 is fixed to theflange portion 12 of thewheel frame 10. Thewheel ring 30 is a metallic ring and functions as the surface of a magnetic control member, a friction pad or a brake pad. - The
freewheel 1 comprises at least onewheel hub 40 disposed at either of the two sides of thewheel frame 10. In this embodiment, thefreewheel 1 comprises twowheel hubs 40 at the two sides of thewheel frame 10. Thewheel hub 40 is made of a colorful and transparent material, so that the user won't touch the parts inside thefreewheel 10 and can see the inner configuration through thetransparent wheel hub 40. When thefreewheel 1 is rotated at a high speed, the colorful andtransparent wheel hub 40 will create streamline and rotational change to enhance its appearance. - As shown in
Fig. 2 andFig. 4 , when in use, the user pedals thecrank unit 65 to drive thefreewheel 1. The weight blocks 20 on thefreewheel 1 keep a certain distance relative to theaxle portion 11 of thewheel frame 10, so thefreewheel 1 will generate a greater centrifugal force when it is rotated at a high speed. In general, the longer distance between thesame weight block 20 and theaxle portion 11 is, the greater centrifugal force will be. Compared to a solid wheel, the distance between thefirst locking portion 18 of theweight block 20 and theaxle portion 11 is greater a half of the radius of thewheel frame 10. With the same weight, the inertial effect of the present invention can be enhanced when the rotational speed is increasing progressively, so the curve of inertial weight is elongated obviously. - As shown in
Fig. 6 andFig. 7 , when in use, thelimit portions 16 at both sides of eachwheel arm 15 of thewheel frame 10 of thefreewheel 1 are provided with the weight blocks 20 as desired. The weight blocks 20 can be decreased. As shown inFig. 7 , the weight blocks 20 are spaced at intervals to lighten the whole weight of thefreewheel 1 so as to have the same inertial effect as the conventional freewheel. The weight of thefreewheel 1 of the present invention can be adjusted as desired. -
Fig. 8 andFig. 9 show another embodiment of the present invention. Thewheel frame 10 further has a plurality ofwheel arms 15 formed between theaxle portion 11 and theflange portion 12. Thewheel arms 15 radially extend from theaxle portion 11 and are equally spaced. Eachwheel arm 15 is formed with anelongated guide portion 17. Theelongated guide portion 17 has a plurality offirst locking portions 18 which have different distances relative to theaxle portion 11. Theelongated guide portion 17 is a slot. Thefirst locking portions 18 are recesses formed at one side of the slot. Theweight block 20 can be moved along theelongated guide portion 17 and locked to a desired first lockingportion 18 to change the distance between theweight block 20 and theaxle portion 11, as shown inFig. 9 . - As shown in
Fig. 10 , thefreewheel 1 of the present invention can be mounted on anoval frame 70. Theframe 70 is provided with a pair ofhandles 71 which can be operated in an interlaced movement. Theframe 70 is provided with a pair ofpedal units 75 which are disposed at both sides of theframe 70 and linked by thehandles 71. Thepedal units 75 are pivotally connected to both sides of thefreewheel 1 throughlink rods 76 to generate inertial and load. - The freewheel of the present invention has the following advantages and is very practical.
- The freewheel structure of the present invention uses the rotational centrifugal force of the weight blocks 20 which keep a certain distance relative to the
axle portion 11 to generate the inertial effect. Compared to the solid freewheel, the freewheel of the present invention has greater centrifugal force. With the same weight, the curve of inertial weight is elongated obviously to enhance the exercise effect of the exercise apparatus. - The freewheel structure of the present invention uses small weight blocks 20 to enhance the inertial weight. Compared to the large solid freewheel, the present invention has less material cost than the prior art and the processing apparatus is a normal one, so the manufacture cost can be reduced greatly.
- Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.
Claims (10)
- A freewheel structure, comprising:a wheel frame (10) having a central axle portion (11) and a flange portion (12) around an outer edge thereof, the wheel frame (10) further having a plurality of wheel arms (15) formed between the axle portion (11) and the flange portion (12), the wheel arms (15) radially extending from the axle portion (11) and being equally spaced, each of the wheel arms (15) having at least one first locking portion (18) thereon; anda plurality of weight blocks (20) each having a second locking portion (21) corresponding to the first locking portion (18) of the corresponding wheel arm (15).
- The freewheel structure as claimed in claim 1, wherein at least one of two side walls of each wheel arm (15) of the wheel frame (10) is formed with a limit portion (16) to receive the corresponding weight block (20), and the first locking portion (18) is formed within the limit portion (16).
- The freewheel structure as claimed in claim 1, wherein a distance defined between the first locking portion (18) of each wheel arm (15) of the wheel frame (10) and the axle portion (11) is greater than a half of the radius of the wheel frame (10).
- The freewheel structure as claimed in claim 1, wherein the first locking portion (18) of each wheel arm (15) of the wheel frame (10) is one of a through hole, a threaded hole, a threaded post and a protruding post, and the second locking portion (21) of each weight block (20) is a corresponding through hole or threaded hole.
- The freewheel structure as claimed in claim 1, wherein the first locking portion (18) of each wheel arm (15) of the wheel frame (10) is a through hole and the second locking portion (21) of each weight block (20) is a corresponding through hole for insertion of a locking member (25) cooperating with a nut, such that the weight blocks (20) are fixed to the wheel arms (15) of the wheel frame (10).
- The freewheel structure as claimed in claim 1, further comprising a wheel ring (30) fitted on the outer edge of the wheel frame (10), the wheel ring (30) having a plurality of spaced locking pieces (31) on an inner edge thereof, the wheel ring (30) being fixed to the flange portion (12) of the wheel frame (10) through the locking pieces (31), the wheel ring (30) functioning as a surface of a magnetic control member, a friction pad or a brake pad.
- A freewheel structure, comprising:a wheel frame (10) having a central axle portion and a flange portion around an outer edge thereof, the wheel frame further having a plurality of elongated guide portions (17) formed between the axle portion (11) and the flange portion (12), the elongated guide portions (17) being equally spaced, each of the elongated guide portions having a plurality of first locking portions (18) which have different distances relative to the axle portion (11); anda plurality of weight blocks (20) each having a second locking portion (21) corresponding to the first locking portions (18) of the corresponding wheel arm.
- The freewheel structure as claimed in claim 7, wherein each of the elongated guide portions (17) is a slot, and the first locking portions (18) are recesses formed at one side of the slot.
- The freewheel structure as claimed in claim 7, wherein the wheel frame further has a plurality of wheel arms (15) formed between the axle portion (11) and the flange portion (12), the wheel arms radially extend from the axle portion and are equally spaced, and the elongated guide portions (17) are respectively formed on the wheel arms (15).
- The freewheel structure as claimed in claim 7, wherein the first locking portions (18) of the wheel frame (10) are through holes and the second locking portion (21) of each weight block (20) is a corresponding through hole for insertion of a locking member cooperating with a nut, such that the weight blocks (20) are fixed to the wheel frame (10).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12166800.8A EP2659936A1 (en) | 2012-05-04 | 2012-05-04 | Freewheel structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12166800.8A EP2659936A1 (en) | 2012-05-04 | 2012-05-04 | Freewheel structure |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2659936A1 true EP2659936A1 (en) | 2013-11-06 |
Family
ID=46027819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12166800.8A Withdrawn EP2659936A1 (en) | 2012-05-04 | 2012-05-04 | Freewheel structure |
Country Status (1)
Country | Link |
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EP (1) | EP2659936A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108479000A (en) * | 2018-04-18 | 2018-09-04 | 应芹绿 | A kind of open air speed limit elliptical machine |
IT201700048638A1 (en) * | 2017-05-05 | 2018-11-05 | Desmotec S R L | FLYWHERE FOR AN EQUIPMENT FOR EXERCISING MUSCLES AND EQUIPMENT EQUIPPED WITH SOUTHERN FLY |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3100639A (en) * | 1961-04-26 | 1963-08-13 | Everett D Bonewitz | Exerciser |
US5163888A (en) * | 1992-02-25 | 1992-11-17 | Stearns Kenneth W | Exercise apparatus |
US20070179026A1 (en) * | 2006-01-30 | 2007-08-02 | Wu Chang M | Drive system for megnetic resistance exercisers field of the invention |
-
2012
- 2012-05-04 EP EP12166800.8A patent/EP2659936A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3100639A (en) * | 1961-04-26 | 1963-08-13 | Everett D Bonewitz | Exerciser |
US5163888A (en) * | 1992-02-25 | 1992-11-17 | Stearns Kenneth W | Exercise apparatus |
US20070179026A1 (en) * | 2006-01-30 | 2007-08-02 | Wu Chang M | Drive system for megnetic resistance exercisers field of the invention |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201700048638A1 (en) * | 2017-05-05 | 2018-11-05 | Desmotec S R L | FLYWHERE FOR AN EQUIPMENT FOR EXERCISING MUSCLES AND EQUIPMENT EQUIPPED WITH SOUTHERN FLY |
WO2018203311A1 (en) * | 2017-05-05 | 2018-11-08 | Desmotec S.R.L. | Flywheel for muscle exercising equipment and equipment provided with said flywheel |
CN108479000A (en) * | 2018-04-18 | 2018-09-04 | 应芹绿 | A kind of open air speed limit elliptical machine |
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