CN110613923A - Speed-dependent rigidity-variable foot web - Google Patents
Speed-dependent rigidity-variable foot web Download PDFInfo
- Publication number
- CN110613923A CN110613923A CN201810637412.4A CN201810637412A CN110613923A CN 110613923 A CN110613923 A CN 110613923A CN 201810637412 A CN201810637412 A CN 201810637412A CN 110613923 A CN110613923 A CN 110613923A
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- Prior art keywords
- rod
- rigidity
- speed
- taper
- adjusting device
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- 230000001419 dependent effect Effects 0.000 title abstract description 23
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- 239000007788 liquid Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 241001481833 Coryphaena hippurus Species 0.000 claims description 2
- 238000013016 damping Methods 0.000 claims description 2
- 230000009182 swimming Effects 0.000 description 21
- 238000005452 bending Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000009189 diving Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 6
- 210000000006 pectoral fin Anatomy 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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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
- A63B31/00—Swimming aids
- A63B31/08—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs
- A63B31/10—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet
- A63B31/11—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the hands or feet attachable only to the feet
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Rehabilitation Tools (AREA)
Abstract
The invention discloses a speed-dependent rigidity-variable fin, which comprises a fin plate and a longitudinal keel, wherein at least one of the longitudinal keels on the longitudinal side edge of the fin plate is a rigidity-variable longitudinal keel, the rigidity-variable longitudinal keel comprises at least one section of rigid rod and at least one rigidity-dependent speed adjusting device, the rigidity-dependent speed adjusting device is connected with the rigid rod end to end or is hidden in the hollow rigid rod, the rigidity-dependent speed adjusting device hidden in the hollow rigid rod comprises a hollow conical tube in the rigid rod and a conical rod which is filled with non-Newtonian fluid or has a common longitudinal axis with the conical tube and can move longitudinally along the longitudinal axis of the conical tube, and when the rigidity-dependent speed adjusting device consists of the conical tube and the conical rod, a reset elastic element for resetting the conical rod which moves longitudinally is also arranged between the conical tube and the conical rod.
Description
Technical Field
The invention relates to the industries of swimming equipment and diving equipment, in particular to a fin with variable stiffness along with speed, which is used for swimming and diving sports.
Background
In modern society, swimming and diving sports are increasingly popularized, various swimming equipment and diving equipment are layered endlessly, and most of the swimming equipment and diving equipment use flippers as main propulsion tools for advancing, wherein the common flippers are respectively worn on two feet, the two flippers are worn on the two feet, the bionic tail fin is worn on the two feet, the two flippers are driving forces for advancing by alternate pumping of the two legs of a swimmer, and the two flippers and the bionic tail fin are driving forces for advancing by synchronous pumping of the two legs of the swimmer.
The swimmer can obtain the best propelling force only by beating water at the optimal beating frequency no matter double-fin, double-fin and single-fin or bionic tail fin; when a swimmer wishes to change the speed of swimming, such as by pumping water at a higher frequency for fast swimming or at a lower frequency for slow swimming, the efficiency of propulsion decreases, especially when the swimmer pumps water at a higher frequency, which is not only inefficient but also quickly fatiguing.
Disclosure of Invention
Aiming at the defects that the main propelling tools of the prior swimming equipment and diving equipment, namely double-foot double-web, double-foot single-web and bionic tail fin, do not well solve the problem of higher propelling efficiency in two states of high-speed quick swimming and low-speed slow swimming, the invention provides a speed-dependent rigidity foot web by combining the characteristics of a human motion structure and scientifically and reasonably applying ergonomics, by means of the speed-dependent rigidity foot web, a swimmer can water at a higher frequency for high-speed quick swimming and can water at a lower frequency for low-speed slow swimming, the rigidity of a rigidity-variable longitudinal keel of the speed-dependent rigidity foot web changes along with the change of the swimming speed or the change of the leg swinging frequency of the swimmer, the swimmer can effectively improve the specific gravity of work no matter what frequency the swimmer pumps water, the advancing efficiency and the swimming speed of the swimmer are improved to the utmost extent, and the physical strength is saved, the traveling potential of the swimmer in water is fully exerted, and the purpose of long-time, long-distance, continuous and high-speed tour is finally achieved; the swimmer can effectively reduce the fatigue feeling generated when the swimmer continuously tours for a long distance and a long time through variable-speed tour.
The invention specifically adopts the following scheme:
a rigidity-variable fin with speed comprises a fin plate and a longitudinal keel, and is characterized in that: at least one longitudinal keel positioned on the longitudinal side edge or the middle part of the fin plate is a rigidity-variable longitudinal keel with variable rigidity, the fin comprises a double-foot single fin with two feet penetrating through one, double-foot double fins with two feet penetrating through one respectively, and a bionic tail fin with two feet penetrating through one, wherein the double-foot single fin is a dolphin fin.
The longitudinal keels of the double-foot single fin are usually two left and right longitudinal keels which are respectively positioned on two longitudinal side edges of the left and right sides of the fin plate of the double-foot single fin, and the two longitudinal keels are variable-rigidity longitudinal keels under the normal condition; the bionic tail fin is characterized in that the two longitudinal keels of the bionic tail fin are also the left longitudinal keel and the right longitudinal keel which are respectively positioned on the left longitudinal side and the right longitudinal side of the fin plate of the bionic tail fin, and the two longitudinal keels are variable-rigidity longitudinal keels under the common condition. The longitudinal keels of each fin of the two-footed double-fin are usually also the two left and right, respectively located on the two longitudinal sides of each fin of the two-footed double-fin, and are usually also variable-stiffness longitudinal keels. The longitudinal side edges are the outer edges of the longitudinal profile.
The rigidity-variable longitudinal keel comprises at least one section of rigid rod and at least one rigidity speed-following adjusting device, and the rigidity speed-following adjusting device and the rigid rod are connected end to end or are hidden in the hollow rigid rod.
The stiffness speed-following adjusting device hidden in the hollow rigid rod comprises a hollow taper pipe in the rigid rod and a non-Newtonian fluid filled in the taper pipe or a taper rod which is coaxial with the taper pipe and can move longitudinally along the longitudinal axis of the taper pipe, when the stiffness speed-following adjusting device consists of the taper pipe and the taper rod, a reset elastic element which enables the taper rod which moves longitudinally to reset is further arranged between the taper pipe and the taper rod, the taper rod comprises a smooth surface taper rod with continuously changed cross section girth and a step surface taper rod with discontinuously changed cross section girth, and the step surface taper rod comprises a step surface taper rod with fixed length and fixed shape and a step surface antenna taper rod with variable length and telescopic pull rod. The smooth surface tapered rod with the continuously changed cross section perimeter is generally a smooth surface tapered rod with fixed length and fixed shape.
The rigid rod of the variable-stiffness longitudinal keel in the previous paragraph is a whole hollow taper tube, the perimeter of the cross-sectional profile from the front end of the swimmer's traveling direction to the rear end of the swimmer's traveling direction and the perimeter of the cross-sectional profile of the interior cavity are both gradually reduced, and the perimeter of the cross-sectional profile of the taper rod is also correspondingly gradually reduced from the front end of the swimmer's traveling direction to the rear end of the swimmer's traveling direction. For smooth surface type taper rod and step surface type taper rod, the tension type reset elastic element arranged in the taper pipe acts on the big end of the taper pipe, or the compression type reset elastic element arranged in the taper pipe acts on the small end of the taper pipe to force the taper pipe to reset towards the advancing direction of the swimmer, the big end of the smooth surface type taper rod and the step surface type taper rod is the front end facing the advancing direction of the swimmer, and the small end is the rear end; for the pull rod antenna type taper rod, a tension type reset elastic element arranged in the taper pipe penetrates through all hollow telescopic joints of the pull rod antenna type taper rod to act on the front end, facing the advancing direction of a swimmer, of the last rod with the smallest cross section perimeter among all telescopic joints of the pull rod antenna type taper rod, or a pressure type reset elastic element arranged in the taper pipe acts on the rear end, facing the advancing direction of the swimmer, of the last rod with the smallest cross section perimeter among all telescopic joints of the pull rod antenna type taper rod, wherein the last rod is the last rod which faces the rear end in the advancing direction of the swimmer in the fully extended state of all telescopic joints of the pull rod antenna type taper rod, in general, the reset elastic element adopts a tension type reset elastic element, such as a tension spring or a rubber band, one end of the reset elastic element is fixed on the inner wall, facing the advancing direction of the front end, of the hollow taper pipe with the larger cross section perimeter, the other end of the telescopic rod passes through each hollow telescopic joint of the pull rod antenna type conical rod and is fixed with the front end of the last rod with the smallest cross section perimeter in each telescopic joint of the pull rod antenna type conical rod. The tension type reset elastic element or the compression type reset elastic element in the section is arranged in the cavity in the taper pipe, the longitudinal axis of the tension type reset elastic element or the compression type reset elastic element is coaxial with the taper pipe, two ends of the tension type reset elastic element are respectively fixed with the large head end of the taper rod and the large head end of the cavity in the taper pipe, and two ends of the compression type reset elastic element are respectively contacted with the small head end of the taper rod and the small head end of the cavity in the taper pipe.
When the rigidity speed-dependent adjusting device consists of a taper pipe and a smooth surface type taper rod or consists of a taper pipe and a step surface type taper rod, the centrifugal force or the inertia force is increased along with the increase of the leg swinging frequency, the smooth surface type taper rod or the step surface type taper rod overcomes the elasticity of the reset elastic element to move backwards along the longitudinal axis of the taper pipe, and the bending rigidity of the longitudinal keel with variable rigidity is increased; when the leg swinging frequency is reduced, along with the reduction of centrifugal force or inertial force, the smooth surface type conical rod or the stepped surface type conical rod moves forwards along the longitudinal axis of the conical pipe under the elastic action of the reset elastic element, and the bending rigidity of the rigidity-variable longitudinal keel is reduced; when the rigidity speed-dependent adjusting device consists of a taper pipe and a pull rod antenna type taper rod, the centrifugal force or the inertia force is increased along with the increase of the leg swinging frequency, the pull rod antenna type taper rod overcomes the elasticity of a reset elastic element and extends backwards step by step along the longitudinal axis of the taper pipe, the bending rigidity of the variable-rigidity longitudinal keel is increased, and the larger the perimeter of the cross section of the rod closer to the outer layer is, the larger the mass is, and the larger the centrifugal force or the inertia force is, the more the rod extends out; when the leg swinging frequency is reduced, along with the reduction of centrifugal force or inertia force, the pull rod antenna type taper rod retracts forwards step by step along the longitudinal axis of the taper pipe under the action of the elastic force of the reset elastic element, the bending rigidity of the variable-rigidity longitudinal keel is reduced, the circumference of the cross section of the rod which is closer to the inner layer is smaller, the mass is smaller, and the centrifugal force or the inertia force is smaller and the rod retracts earlier. A lubricating medium for reducing the friction resistance between the taper pipe and the taper rod is filled between the taper pipe and the taper rod, and the lubricating medium comprises but is not limited to lubricating oil, lubricating grease and lubricating liquid; the reset elastic element comprises but is not limited to a compression spring, an extension spring, a disc spring, an elastic sheet and a rubber band.
When the rigidity speed-dependent adjusting device consists of a taper pipe and non-Newtonian fluid, the non-Newtonian fluid enables the bending rigidity of the longitudinal keel with variable rigidity to be increased along with the increase of the leg swinging frequency; as the swing leg frequency decreases, the non-newtonian fluid causes the bending stiffness of the variable stiffness longitudinal spine to decrease.
The rigidity speed-following adjusting device connected end to end with the rigid rod comprises a piston cylinder, a piston rod and a reset spring, wherein a hollow cavity is formed inside the piston rod, a damping hole communicated with the hollow cavity in the piston cylinder is formed in one end, facing the piston cylinder, of the piston rod, the reset spring is arranged between the piston cylinder and the piston rod and located in the piston cylinder, the reset spring, the piston cylinder and the piston rod share a common longitudinal axis, liquid or gas or liquid and gas are filled in the hollow cavities of the piston cylinder and the piston rod simultaneously, the rigid rod and the rigidity speed-following adjusting device are connected end to end in a hinged or rigid mode, and the longitudinal axes of the rigid rod and the rigidity speed-following adjusting device are parallel or angled.
Typically, each of the variable stiffness longitudinal keels described in the preceding paragraph is comprised of 2 or more stiffness-dependent speed adjustment devices and an equivalent number of rigid bars connected end to end with one another, the rigid bars and the stiffness-dependent speed adjustment devices being rigidly connected or hinged together in an end to end relationship, and the longitudinal axes being hinged together at an angle, the stiffness of the variable stiffness longitudinal keel at the forward end of the swimmer's direction of travel being the greatest with respect to the cross-sectional profiles of the speed adjustment devices and the rigid bars, and the stiffness of the variable stiffness longitudinal keel at the rearward end of the swimmer's direction of travel being the least with respect to the cross-sectional profiles of the speed adjustment devices and the rigid bars. When the leg swinging frequency is increased, the bending rigidity of the variable-rigidity longitudinal keel is increased by the rigidity-along-speed adjusting device; when the leg swinging frequency is reduced, the bending rigidity of the longitudinal keel with variable rigidity is reduced by the rigidity and speed adjusting device.
The rigidity speed-following adjusting device is connected with the rigid rod end to end, meanwhile, the rigid rod is internally provided with a hollow cavity structure, and the other rigidity speed-following adjusting device is hidden in the rigid rod.
The rigidity speed-following adjusting device connected end to end with the rigid rod in the last paragraph is a rigidity speed-following adjusting device composed of a piston cylinder, a piston rod, a return spring and other elements, the other rigidity speed-following adjusting device hidden in the rigid rod is composed of a conical tube and a content in the conical tube, and the content in the conical tube is non-Newtonian fluid or a lubricating medium added by the conical rod and a return elastic element. When the leg swinging frequency is increased, the bending rigidity of the variable-rigidity longitudinal keel is increased by the two types of rigidity-along-speed adjusting devices; when the leg swinging frequency is reduced, the bending rigidity of the rigidity-variable longitudinal keel is reduced by the two types of rigidity-speed-following regulating devices.
In the invention, the rigid rod is made of materials including but not limited to engineering plastics, glass fiber reinforced plastics, carbon fibers, thin-wall steel, aluminum alloy, titanium alloy, thin-wall copper alloy, ceramics, toughened glass, bamboo, wood and nylon, and has light weight and high strength so as to meet the requirements of long-time and heavy-load work.
The invention has the advantages that:
1. the swimmer can swim fast at a high frequency and swim slowly at a low frequency, and the rigidity of the variable-rigidity longitudinal keel of the swimmer can be changed along with the change of the swimming speed or the change of the leg swinging frequency of the swimmer, so that the swimmer can effectively improve the proportion of useful work no matter what frequency the swimmer swims, the advancing efficiency and the swimming speed of swimming and diving are improved to the maximum extent, the physical strength is saved, the advancing potential of the swimmer in water is fully exerted, and finally the purpose of continuous and high-speed tour for a long time and a long distance is achieved.
2. The rigidity-variable foot web along with the speed can effectively reduce the fatigue feeling generated when a swimmer continuously tours for a long distance and a long time through variable speed tour.
3. The invention has the advantages of light structure, reliable work, simple corresponding manufacturing process and low cost, and is convenient for large-scale production and popularization and use.
Drawings
Fig. 1 is a schematic view of the construction of a speed varying stiffness fin comprising a fin panel and left and right longitudinal keels in accordance with the present invention.
In the figure: 1. speed-dependent stiffness flippers; 101. a web plate; 102. a longitudinal keel.
Wherein the left and right longitudinal keels 102 are both variable stiffness longitudinal keels.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the composition structure of a speed-dependent stiffness fin 1 of the present invention mainly comprises a fin plate 101 and left and right longitudinal keels 102, wherein the left and right longitudinal keels 102 are both stiffness-dependent longitudinal keels.
The specific embodiment of the invention is as follows:
the first embodiment is as follows: as shown in fig. 1, a speed varying stiffness fin 1 of the present invention mainly comprises a fin panel 101 and left and right longitudinal keels 102.
The speed-dependent stiffness fin 1 shown in fig. 1 is a double-footed single fin, and its longitudinal keels 102 are left and right, respectively located on both longitudinal sides of the fin plate 101 of the double-footed single fin, and both longitudinal keels 102 are stiffness-dependent longitudinal keels.
The variable stiffness longitudinal keel described in the previous paragraph includes a rigid rod with an integral root and a stiffness-dependent speed adjustment means concealed within the rigid rod. The rigidity speed-dependent adjusting device consists of a hollow conical pipe in the rigid rod and a content in the conical pipe. The content can be non-Newtonian fluid, and can also be a conical rod and a reset elastic element and a lubricating medium.
The cross-sectional contour perimeter of the rigid rod from the front end of the swimmer advancing direction to the rear end of the swimmer advancing direction and the cross-sectional perimeter of the internal taper pipe cavity are both gradually reduced, and the cross-sectional contour perimeter of the content in the taper pipe is also correspondingly gradually reduced from the front end of the swimmer advancing direction to the rear end of the swimmer advancing direction.
When the leg swinging frequency of the swimmer is increased, the rigidity-along-speed adjusting device enables the bending rigidity of the rigidity-variable longitudinal keel to be increased; when the leg swinging frequency is reduced, the rigidity-dependent speed adjusting device enables the bending rigidity of the rigidity-variable longitudinal keel to be reduced.
The swimmer can beat water at a high speed and swim rapidly at a high frequency and beat water at a low speed and swim slowly at a low frequency, the bending rigidity of the variable-rigidity longitudinal keel of the foot web 1 with variable rigidity changes along with the change of the swimming speed or the change of the leg swinging frequency of the swimmer, and the swimmer can effectively improve the proportion of useful work no matter what frequency the swimmer beats water, improve the advancing efficiency and the swimming speed of swimming and diving to the maximum extent and save physical strength, fully develop the advancing potential of the swimmer in the water, and finally achieve the purpose of long-time, long-distance and continuous high-speed tour; the swimmer can effectively reduce the fatigue feeling generated when the swimmer continuously tours for a long distance and a long time through variable-speed tour.
The above-mentioned embodiments are only for convenience of illustration and are not intended to limit the invention in any way, and those skilled in the art will be able to make modifications and equivalents of the disclosed embodiments without departing from the technical scope of the invention.
Claims (5)
1. A rigidity-variable fin with speed comprises a fin plate and a longitudinal keel, and is characterized in that: at least one longitudinal keel positioned on the longitudinal side edge of the fin plate is a rigidity-variable longitudinal keel with variable rigidity, the fin comprises a double-foot single fin with two feet penetrating one, double-foot double fins with two feet penetrating one respectively, and a bionic tail fin with two feet penetrating one, wherein the double-foot single fin is a dolphin fin.
2. A speed varying stiffness flipper according to claim 1 wherein: the rigidity-variable longitudinal keel comprises at least one section of rigid rod and at least one rigidity speed-following adjusting device, and the rigidity speed-following adjusting device and the rigid rod are connected end to end or are hidden in the hollow rigid rod.
3. A speed varying stiffness flipper according to claim 2 wherein: the stiffness speed-following adjusting device hidden in the hollow rigid rod comprises a hollow taper pipe in the rigid rod and a non-Newtonian fluid arranged in the taper pipe or a taper rod which is coaxial with the taper pipe and can move longitudinally along the longitudinal axis of the taper pipe, when the stiffness speed-following adjusting device comprises the taper pipe and the taper rod, a reset elastic element which enables the taper rod which moves longitudinally to reset is further arranged between the taper pipe and the taper rod, the taper rod comprises a smooth surface taper rod with continuously changed cross section girth and a step surface taper rod with discontinuously changed cross section girth, and the step surface taper rod comprises a step surface taper rod with fixed length and fixed shape and a step surface antenna taper rod with variable length and telescopic pull rod.
4. A speed varying stiffness flipper according to claim 2 wherein: the rigidity speed-following adjusting device connected end to end with the rigid rod comprises a piston cylinder, a piston rod and a reset spring, wherein a hollow cavity is formed inside the piston rod, a damping hole communicated with the hollow cavity in the piston cylinder is formed in one end, facing the piston cylinder, of the piston rod, the reset spring is arranged between the piston cylinder and the piston rod and located in the piston cylinder, the reset spring, the piston cylinder and the piston rod share a common longitudinal axis, liquid or gas or liquid and gas are filled in the hollow cavities of the piston cylinder and the piston rod simultaneously, the rigid rod and the rigidity speed-following adjusting device are connected end to end in a hinged or rigid mode, and the longitudinal axes of the rigid rod and the rigidity speed-following adjusting device are parallel or angled.
5. A rate-variable stiffness flipper according to claim 3 or 4, wherein: the rigidity speed-following adjusting device is connected with the rigid rod end to end, meanwhile, the rigid rod is internally provided with a hollow cavity structure, and the other rigidity speed-following adjusting device is hidden in the rigid rod.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810637412.4A CN110613923A (en) | 2018-06-20 | 2018-06-20 | Speed-dependent rigidity-variable foot web |
| PCT/CN2019/091442 WO2019242573A1 (en) | 2018-06-20 | 2019-06-16 | Foot fin having variable stiffness and adjustable propulsion power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810637412.4A CN110613923A (en) | 2018-06-20 | 2018-06-20 | Speed-dependent rigidity-variable foot web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110613923A true CN110613923A (en) | 2019-12-27 |
Family
ID=68920928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810637412.4A Pending CN110613923A (en) | 2018-06-20 | 2018-06-20 | Speed-dependent rigidity-variable foot web |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110613923A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541810A (en) * | 1983-10-28 | 1985-09-17 | Wenzel Clarence E | Swimming apparatus |
| RU2075320C1 (en) * | 1993-04-23 | 1997-03-20 | Товарищество с ограниченной ответственностью "ЛиК" | Fin |
| US20110217890A1 (en) * | 2010-03-02 | 2011-09-08 | Norbert Fleck | Swimming device for a swimmer or diver |
| CN207412640U (en) * | 2017-10-25 | 2018-05-29 | 东莞市宏俊运动用品有限公司 | A kind of adjustable flippers |
| CN208448558U (en) * | 2018-06-20 | 2019-02-01 | 朱光 | One kind is with fast variation rigidity flippers |
-
2018
- 2018-06-20 CN CN201810637412.4A patent/CN110613923A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541810A (en) * | 1983-10-28 | 1985-09-17 | Wenzel Clarence E | Swimming apparatus |
| RU2075320C1 (en) * | 1993-04-23 | 1997-03-20 | Товарищество с ограниченной ответственностью "ЛиК" | Fin |
| US20110217890A1 (en) * | 2010-03-02 | 2011-09-08 | Norbert Fleck | Swimming device for a swimmer or diver |
| CN207412640U (en) * | 2017-10-25 | 2018-05-29 | 东莞市宏俊运动用品有限公司 | A kind of adjustable flippers |
| CN208448558U (en) * | 2018-06-20 | 2019-02-01 | 朱光 | One kind is with fast variation rigidity flippers |
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