WO2014194339A2 - Blade arrangement for a diving fin - Google Patents
Blade arrangement for a diving fin Download PDFInfo
- Publication number
- WO2014194339A2 WO2014194339A2 PCT/ZA2014/000018 ZA2014000018W WO2014194339A2 WO 2014194339 A2 WO2014194339 A2 WO 2014194339A2 ZA 2014000018 W ZA2014000018 W ZA 2014000018W WO 2014194339 A2 WO2014194339 A2 WO 2014194339A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- fin
- flap
- dive
- foot pocket
- Prior art date
Links
- 230000009189 diving Effects 0.000 title description 6
- 230000001965 increasing effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 229920002457 flexible plastic Polymers 0.000 claims description 2
- 241000237519 Bivalvia Species 0.000 claims 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims 1
- 235000020639 clam Nutrition 0.000 claims 1
- 239000013536 elastomeric material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000013461 design Methods 0.000 description 4
- 210000004379 membrane Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009182 swimming Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- A63B31/12—Swim fins, flippers or other swimming aids held by, or attachable to, the hands, arms, feet or legs held by, or attachable to, the arms or legs
Definitions
- This invention relates to a diving fin having a self-adjusting angle of attack.
- a standard fin includes a foot pocke for accommodating the diver's foot, and a blade extending from the foot pocket, for providing thrust as the ' diver kicks.
- finning The basic principal of finning is that the diver uses his legs to push the blade of the fin, the blade pushes the water and, in turn, the diver is propelled forward.
- Types of fins have evolved to address the unique requirements of each community using them. Scuba divers, in particular, need large wide blades to overcome the wate resistance caused by their diving equipment..
- the - ngle of attack is the relative angle between the actual alignment of the oncoming flow (a vector of the flow created by the upward or downward kicking motion a d the flow created by the forward motion of the swimmer) and the lengthwise alig ment of the blade of the fin.
- a fixed blade angle provides a constant trade-off between comfort (low angle of attack and resistance) and thrust (higher angle of attack).
- the fin is not able to change its properties to suit the exac diver or circumstances.
- the movable members When kicked under water, the movable members are capable of wiggling independently and respectively so as to generate more lift b enhancing more water to be project from the trailing edge of the fin blade thereof.
- the movable members are furthermore capable of reducing the drag and turbulence exerting on the same by the water flow which will reduce the diver's fatigue and subsequently extend the swimming time and range.
- a dive fin comprising a blade extending from a foot pocket, the inner portion comprising a flap capable of independent movement in relation to the body of the blade when the blade is placed under pressure.
- the flap may be connected to the blade along th trailing edge of the biade.
- the flap may additionally be connected to the body of the blade by connection means beatable along the perimeter of the fap .
- connection means may include one or more strips of eiastorneric material, !ocatafoie between the flap and the body of the blade, for connecting the flap to the blade at localised points.
- connection means may include an eiastorneric membran iocatafote etween the flap and the body of the blade for connecting the flap to the blade along its entire perimeter
- connection means are intended to ⁇ limit the independent movement of the flap.
- the fin may additionally include support ribs extending from the foot pocket along the length of the blade.
- the support ribs may either extend along the outer edges of the blade, or may extend aieng the interior of the blade, between the flap and the body of the blade.
- the blade may also be attached to the foot pocket by an articulated joint or hinge, Including a biasing system to prevent the hinge from moving past a predetermined limit.
- the blade may fee manufactured from one or more resilient yet flexibl plastic materials, such as thermoplastic elastomers, and rigid plastic or composite panels may also be incorporated.
- Figure 1 is a representation of a first embodiment of the invention applied to a traditional fin
- Figure 2 is a representation of a second embodiment of the invention applied to a traditional fin
- Figure 3 Is a representation of the first embodiment of the invention applied to a different fin design:
- Figure 4 is a representation of the second embodiment of the invention applied to a different fin design
- Figure 5 is a representation of a third embodiment of the invention.
- Figure 6 is a representation of a fourth embodiment of the invention.
- FIGS 7 to 10 show one embodiment of the fin in use.
- the dive fin 10 includes a blade 12 extending from a foot pocket 14.
- the Inner portion of the lade comprises a flap 16 capable of independent movement in relation to the body of the blade when the blad 12 is placed unde pressure.
- the flap 18 is connected to the body of the blade 12. along the trailing edge of the blade, situated furthest from the foot pocket 14.
- the flap 16 may be surrounded by the body of the blade 12 on all sides.
- the flap 18 may extend almost into abutment with the leading edge 19 of the blade closest to the foot Docket 14.
- the flap 16 is connected to the bod of the blade 12 by an eiastomeric membrane 20 located between the flap 16 and the body of the blade 12.
- the flap 16 is connected to the body of the bfede along Its length by a plurality of strips of eiastomeric material 22, located between the flap 8 and the body of the blade 12. ⁇
- connection means 20 or 22 are intended to limit the Independent movement of the flap 16,
- the fin 10 may additionally include support ribs 2 -extending from the foot pocket.
- these support ribs 24 may extend along the outer edges of the blade.
- the support ribs 24 may extend along the interior of the blade, between the flap 16 and the body of the blade 12.
- the blad 12 ma also be attached to the foot pocket by an articulated joint or hinge 26, including a biasing system 28 to prevent the hinge from moving past a predetermined limit.
- the blade 12 will be manufactured from one or more resilient yet flexible plastic material?-,, such as thermoplastic elastomers, and that rigid plastic or composite panels may also be incorporated.
- the blade 12 deflects to a degree.
- the membran or strips limit and control the amount of deflection that the flap is capable of.
- the angle of the main blade is fixed, regardless of kick strength.
- the flap 16 does not deflec relative to th blade 12 so they share the same angle of attack.
- the flap 16 gradually deflects so that it presents a greater angle of attack.
- the flap 16 reaches the limit of its deflection, dictated by the membrane 20 or eiastomeric strips 22, so as to prevent an excessive angle of attack that would prevent effective thrust generation.
- the fin 10 therefore automatically adjusts the angie of attack to suit the circumstances, ft allows for low resistance (and lower thrust) when the diver is swimming gently and then, in a continuously variable manner, adjusts to provide greater thrust (and resistance) as the diver aims to swim faster, it therefore also self-compensates for the changing direction of apparent oncoming flow.
- the invention therefore provides a novel dive fin.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Knives (AREA)
- Toys (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA2015/07836A ZA201507836B (en) | 2013-04-12 | 2015-10-21 | Blade arrangement for a diving fin |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA201302626 | 2013-04-12 | ||
ZA2013/02626 | 2013-04-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2014194339A2 true WO2014194339A2 (en) | 2014-12-04 |
WO2014194339A3 WO2014194339A3 (en) | 2015-04-23 |
Family
ID=51989557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ZA2014/000018 WO2014194339A2 (en) | 2013-04-12 | 2014-04-11 | Blade arrangement for a diving fin |
Country Status (2)
Country | Link |
---|---|
WO (1) | WO2014194339A2 (en) |
ZA (1) | ZA201507836B (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4775343A (en) * | 1985-11-12 | 1988-10-04 | Undersea Industries, Inc. | Hydrodynamic swim fin |
US20120289105A1 (en) * | 2011-05-09 | 2012-11-15 | Gerardo Oscar Martinez | Reverse thrust swimming flipper |
-
2014
- 2014-04-11 WO PCT/ZA2014/000018 patent/WO2014194339A2/en active Application Filing
-
2015
- 2015-10-21 ZA ZA2015/07836A patent/ZA201507836B/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2014194339A3 (en) | 2015-04-23 |
ZA201507836B (en) | 2017-11-29 |
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