WO2018182519A1 - Ensemble de fixation de pied et procédés associés - Google Patents

Ensemble de fixation de pied et procédés associés Download PDF

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Publication number
WO2018182519A1
WO2018182519A1 PCT/SG2018/050148 SG2018050148W WO2018182519A1 WO 2018182519 A1 WO2018182519 A1 WO 2018182519A1 SG 2018050148 W SG2018050148 W SG 2018050148W WO 2018182519 A1 WO2018182519 A1 WO 2018182519A1
Authority
WO
WIPO (PCT)
Prior art keywords
assembly
rotatable member
watercraft
foot
rotated
Prior art date
Application number
PCT/SG2018/050148
Other languages
English (en)
Inventor
Chi'-Loong Benedict TAN
Shaohui Foong
Original Assignee
Changi General Hospital Pte Ltd
Singapore University Of Technology And Design
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 Changi General Hospital Pte Ltd, Singapore University Of Technology And Design filed Critical Changi General Hospital Pte Ltd
Priority to SG11201907586YA priority Critical patent/SG11201907586YA/en
Priority to CN201880022589.1A priority patent/CN110475592B/zh
Publication of WO2018182519A1 publication Critical patent/WO2018182519A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C10/00—Snowboard bindings
    • A63C10/16—Systems for adjusting the direction or position of the bindings
    • A63C10/18—Systems for adjusting the direction or position of the bindings about a vertical rotation axis relative to the board
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/40—Twintip boards; Wakeboards; Surfboards; Windsurfing boards; Paddle boards, e.g. SUP boards; Accessories specially adapted therefor
    • B63B32/45—Fixation means for feet of the board user, e.g. footstraps
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C10/00—Snowboard bindings
    • A63C10/02—Snowboard bindings characterised by details of the shoe holders
    • A63C10/04—Shoe holders for passing over the shoe
    • A63C10/06—Straps therefor, e.g. adjustable straps
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C17/00—Roller skates; Skate-boards
    • A63C17/26—Roller skates; Skate-boards with special auxiliary arrangements, e.g. illuminating, marking, or push-off devices
    • A63C17/262—Roller skates; Skate-boards with special auxiliary arrangements, e.g. illuminating, marking, or push-off devices with foot bindings or supports therefor

Definitions

  • the present disclosure relates broadly to an assembly for securing a foot of a person onto a surface of a watercraft and a watercraft comprising the assembly.
  • Related apparatuses and methods are also disclosed herein.
  • an assembly for securing a foot of a person onto a surface of a watercraft comprising: a retention member for receiving and securing the foot in a default position; and a rotatable member coupled to the retention member for allowing the retention member to be rotated upon itself and about an axis substantially perpendicular to the surface of the watercraft; wherein the rotatable member is configured to rotate the retention member from the default position to a rotated position when a torque applied to the rotatable member exceeds a threshold.
  • the rotatable member comprises a biasing member for biasing the retention member to the default position.
  • the retention member is configured to secure the received foot such that length of the received foot is substantially perpendicular to a direction of motion of the watercraft in the default position.
  • the rotated position comprises a position where the retention member is rotated from between more than 0° and 90° from the default position.
  • the assembly further comprises a stop member configured to prevent a further rotation of the rotatable member, when the rotatable member has rotated to a maximal rotated position.
  • the stop member comprises a protrusion projecting from a surface of the rotatable member, such that the protrusion moves along a rotational path in tandem with rotation of the rotatable member, and positioning a stopper at a point on the rotational path prevents further rotation of the rotatable member.
  • the maximal rotated position comprises a position where retention member is rotated from between 30° and 90° from the default position.
  • the retention member comprises a midfoot strap.
  • the rotatable member comprises a rotary pivot or a rotary bearing.
  • he biasing member is adjustable to vary the threshold, the rotated position, the maximal rotated position or a biasing strength of the biasing member.
  • the biasing member comprises a torsional spring or a linear spring.
  • the stiffness of the torsional spring is from 100 Nm/rad to 1000
  • the threshold is more than the torque applied to the rotatable member during normal motion condition of the watercraft without sharp deceleration. In one embodiment, an exposed area of the rotatable member is flush with the surface of the watercraft.
  • the retention member is devoid of a power source.
  • the rotatable member is configured to be rotatable in the anticlockwise direction from the default position, when the rotatable member is disposed on the starboard side of the watercraft. In one embodiment, the rotatable member is configured to be rotatable in the clockwise direction from the default position, when the rotatable member is disposed on the port side of the watercraft.
  • an apparatus comprising a pair of first and second assemblies, each of the assemblies in accordance with one or more of above embodiments, wherein the maximal rotated position of the first assembly relative to the default position is at a different angle from the rotated position of the second assembly.
  • a biasing strength of a biasing member of the first assembly is different from a biasing strength of a biasing member of the second assembly.
  • a stiffness of a torsional or linear spring of the first assembly is different from a stiffness of a torsional or linear spring of the second assembly.
  • a watercraft comprising the assembly or the apparatus in accordance with one or more of above embodiments
  • a method of securing a foot of a person onto a surface of a watercraft comprising: providing a retention member for receiving and securing the foot of in a default position; coupling the retention member to a rotatable member, said rotatable member for allowing the retention member to be rotated upon itself and about an axis substantially perpendicular to the surface of the watercraft; and allowing the rotatable member to rotate the retention member from the default position to a rotated position when a torque applied to the rotatable member exceeds a threshold.
  • the watercraft is selected from the group consisting of: sailboat, skiff, dinghy, catamaran, trimaran, surfboard, kitesurfing board, windsurfing board and wakeboarding board.
  • FIG. 1 A is drawing showing a perspective view of an assembly in accordance with an exemplary embodiment.
  • Fig. 1 B is drawing showing a perspective view of the assembly of FIG. 1 A when the assembly is in a rotated position in accordance with an exemplary embodiment.
  • FIG. 2A is a schematic drawing showing a front view of an assembly in accordance with an exemplary embodiment.
  • FIG. 2B is a schematic drawing showing a top plan view of an assembly in accordance with an exemplary embodiment.
  • FIG. 3 is a drawing showing an assembly on a surface of a watercraft in accordance with an exemplary embodiment.
  • FIG. 4A is a schematic drawing showing a top plan view of a foot when secured in an assembly in accordance with an exemplary embodiment.
  • FIG. 4B is a schematic drawing showing a top plan view of a position of a foot when a retention member of the assembly of FIG. 4A is in a first rotated position.
  • FIG. 4C is a schematic drawing showing a top plan view of a position of a foot when a retention member of the assembly of FIG. 4A is in a second rotated position.
  • FIG. 5A is a schematic drawing showing a bottom plan view of an assembly in a default position in accordance with an exemplary embodiment.
  • FIG. 5B is a schematic drawing showing a bottom plan view of the assembly of FIG. 5A in a maximal rotated position in accordance with an exemplary embodiment.
  • FIG. 6A is a drawing showing a perspective view of an apparatus comprising a pair of first and second assemblies in accordance with an exemplary embodiment.
  • FIG. 6B is a drawing showing a perspective view of the apparatus of FIG. 6A when the assemblies are in rotated positions in accordance with an exemplary embodiment.
  • FIG. 7 is a drawing showing a bottom perspective view of an apparatus in accordance with an exemplary embodiment.
  • FIG. 8A is a schematic drawing showing a top plan view of each foot when secured in an apparatus disposed on a watercraft in accordance with an exemplary embodiment
  • FIG. 8B is a schematic drawing illustrating a momentum of a rearfoot portion of each foot when there is a deceleration of the watercraft in accordance with an exemplary embodiment.
  • FIG. 8C is a schematic drawing showing a top plan view of a position of each foot when the assemblies of the apparatus are in their respective rotated positions.
  • FIG. 8D is a schematic drawing showing a top plan view of a position of each foot after ejection from the first assembly and the second assembly of the apparatus.
  • FIG. 9A is a schematic drawing showing a bottom plan view of an apparatus in a default position in accordance with an exemplary embodiment.
  • FIG. 9B is a schematic drawing showing a bottom plan view of the apparatus of FIG. 9A in a maximal rotated position in accordance with an exemplary embodiment.
  • FIG. 10 is a schematic flowchart for illustrating method of securing a foot of a person onto a surface of a watercraft in accordance with an exemplary embodiment.
  • FIG. 1 A is a drawing showing a perspective view of an assembly 100 for securing a foot of a person in accordance with an exemplary embodiment disclosed herein.
  • the assembly 100 comprises a retention member 102 and a rotatable member 104 coupled to the retention member 102.
  • the assembly 100 is disposed on a surface 106 of a watercraft and in such an embodiment, the retention member 102 may be on top of the rotatable member 104 such that the rotatable member 104 is between the retention member 102 and the surface 106.
  • the retention member 102 may receive and thereby secure the foot of a person onto the surface 106 of the watercraft.
  • the rotatable member 104 is rotatable upon itself and about an axis represented by the dotted line X as shown in FIG. 1 A.
  • the axis X is substantially perpendicular to the surface 106. In the exemplary embodiment, the axis is fixed and passes through the geometric centre 1 10 of the rotatable member 104.
  • the rotation of the rotation member 104 also rotates the retention member 102 (and therefore a foot received therein) about the axis represented by the dotted line X substantially perpendicular to the surface 106.
  • the axis may also pass through the geometric centre 108 of the retention member 102, and as such, the retention member 102 is also rotatable upon itself about the axis X.
  • the rotatable member 102 is therefore also rotatable upon itself and about the axis X substantially perpendicular to the surface 106. It will be appreciated that in alternative embodiments of the assembly 100, the rotatable member 102 may also be configured to have an axis of rotation that does not pass through the geometric centre 108 of the retention member 102 or the geometric centre 1 10 of the rotatable member 104. In such alternative embodiments, the rotatable member 102 is rotatable upon itself with the axis of rotation remaining substantially perpendicular to the surface 106, and the axis of rotation passes through the retention member 102 and rotatable member 104.
  • the assembly 100, the rotatable member 104 and the retention member 102 are in their default, unrotated positions.
  • the assembly 100, the rotatable member 104 and the retention member 102 may not move translationally.
  • the rotatable member 104 further comprises a biasing member (not shown) for biasing the rotatable member 104 and the retention member 102 to their default, unrotated positions.
  • FIG. 1 B is a drawing showing a perspective view of the assembly 100 when the assembly 100 is in a rotated position.
  • the rotatable member 104 and the retention member 102 have been rotated from the default, unrotated position about the axis represented by the dotted line X, said axis substantially perpendicular to the surface 106 and passing through the geometric centres 1 10 and 108 of the rotatable member 104 and the retention member 102 respectively.
  • Rotation of the rotatable member 104 and the retention member 102 from the default position may be effected by a rotational force or a torque applied to the rotatable member 104 and/or the retention member 102, said rotational force or torque exceeding a threshold.
  • the rotatable member 104 comprises a rotary pivot or a rotary bearing to allow for the rotation to occur about the axis X.
  • at least a portion of the rotatable member 104 is embedded or recessed within the surface 106 and the portion that is exposed i.e. the top surface of the rotatable member 104 is substantially flush with the surface 106.
  • the exposed portion or the top surface of the rotatable member 104 may be substantially flat and disc-shaped.
  • a disc shape has an infinite order of rotational symmetry about its geometric centre, and as such, the disc-shaped portion of the rotatable member 104 may remain substantially flush with the surface 106 at all angles of rotation about the geometric centre.
  • the seamless integration of the rotatable member 104 with the surface 106 advantageously allows the foot to experience minimal unevenness, protrusion or recess, when placed upon the rotatable member 104 and secured by the securing member 102. Therefore, comfort and performance are maximised.
  • the assembly 100 may also be mounted or installed on the surface 106 in alternative embodiments, such that the rotatable member 104 extends above the surface 106.
  • the assembly 100 may comprise a housing for receiving at least a portion of the rotatable member 104 such that only a top surface of the rotatable member 104 remains exposed and substantially flush with a top surface of the housing.
  • Such an assembly may be mounted or installed on the surface of 106 by coupling the housing to the surface 106, for example, by threaded means, screw means, nail means or the like.
  • the surface 106 is reinforced with backing to provide a sturdier surface for coupling to the housing of the assembly.
  • a mounted embodiment which may be positioned close to the midline of a windsurfing board can better preserve the structural integrity of the displacement board.
  • the mounted embodiment may also be implemented on kite boards and wakeboards which are typically of composite fibreglass/kelvar/carbon fiber material and are therefore too thin/fragile to allow for a recessed embodiment.
  • the mounted embodiment may also be implemented on certain classes of sailboats comprising only aluminium tubes and lacking sailing wings for receiving a recessed embodiment.
  • the retention member 102 is in the form of a midfoot strap.
  • the retention member 102 in the form of a midfoot strap has its distal ends fixedly or removably attached to opposite edges of the exposed portion or the top surface of the rotatable member 104, such that the retention member 102 forms a curve shape or loop atop the rotatable member 104, thereby defining an aperture 202 for receiving and securing at least a midfoot portion of a foot therein.
  • the retention member is not limited to a midfoot strap, but may be provided in alternative manners such that it is capable of receiving and/or securing at least a forefoot portion of a foot and/or a midfoot portion of a foot to the top surface of the rotatable member 104. As the rotatable member 104 is coupled to the watercraft, securing the foot to the rotatable member secures the foot to the watercraft.
  • the retention member 102 when a foot is inserted through the aperture 202, at least a portion of the retention member 102, for example, an inner face 206 of the retention member 102 is in contact with at least a portion of the top of the forefoot portion and/or the midfoot portion of a foot received therein.
  • a portion of the sole of the foot for example, the balls of the foot or the heel of the foot may face or fully contact or partially contact the top surface 208 of the rotatable member 104.
  • the retention member 102 may be removably attached to the rotatable member 104, for washing or replacement purposes.
  • the retention member 102 may be removably attached or fastened to the rotatable member 104, for example, by way of hook and loop fasteners, Velcro tape, buckle, clasp, popper fastener or the like.
  • the retention member 102 may also be adjustable such that the size of the aperture 202 or loop can be adjusted to cater to different foot sizes, to provide comfort to the user.
  • the retention member 102 does not receive and/or secure a rearfoot portion of a foot.
  • the retention member 102 is preferably made of a material that is water-resistant.
  • the retention member 102 is preferably made of a material which is comfortable to a person and which also provide sufficient grip so that a foot received therein would not slip out. Examples of such material include but are not limited to carbon fibre, fibreglass, high strength textiles or the like.
  • the aperture 202 for receiving a foot has a width W of about 10 cm to about 16 cm and a height H of about 7 cm to about 13 cm.
  • FIG. 2B is a schematic drawing showing a top plan view of an assembly in accordance with an exemplary embodiment.
  • the rotatable member 104 comprises a biasing member 204 for biasing the rotatable member 104 and the retention member 102 to their default, unrotated positions.
  • the biasing member 204 may be disposed at the underside of the rotatable member 104. That is the biasing member 204 is disposed underneath the rotatable member 104, on a bottom surface 210 (see FIG. 2A) opposite the surface 208 where the retention member 102 is disposed.
  • the biasing member is in the form of a flat spiral torsional spring wound into the shape of Archimedes spiral with constant spacing between the coils.
  • the end 212 at the outer coil of the spring may be fixed to a portion of the watercraft e.g. a fuselage or main body of the watercraft (or to a bracket fixedly and rigidly attached to a portion of the watercraft) while the end at the centre of the spring (hidden under rotatable member 104 in FIG. 2B) may be fixed to a portion of the rotatable member 104 to resist rotation of the rotatable member 104 relative to the watercraft.
  • the spring is a right hand wound spring. As may be appreciated, the spring can be right hand wound or left hand wound to resist clockwise or anticlockwise rotations.
  • linear springs that may provide a restoring force to return the rotatable member 104 coupled thereto to its default, unrotated position
  • linear springs extension springs, compression springs and other forms of torsional spring may be used to resist rotation of the rotatable member 104, when deployed in particular configurations.
  • the biasing member comprises a linear spring
  • one end of the linear spring may be fixed to a portion of the watercraft (or to a bracket fixedly and rigidly attached to a portion of the watercraft) while the other end may be fixed to a portion of the rotatable member 104 e.g. a proximal perimeter of the rotatable member 104, to resist movement of the proximal perimeter of the rotatable member 104 where the other end is fixed. In this way, rotation of the rotatable member 104 is resisted.
  • FIG. 3 is a drawing showing an assembly 300 on a surface 308 of a sailing wing located or disposed at the port side of a watercraft, in an example embodiment.
  • the assembly 300 functions substantially similarly to the assembly 100 of FIG. 1 and 2.
  • the retention member 302 and the rotatable member 304 are in their default, unrotated positions when the watercraft is moving in the direction of 306. In its default, unrotated position, the retention member 302 may receive and secure a foot such that the length of the received foot is substantially perpendicular to the direction of motion 306.
  • the assembly 300 may therefore be disposed on a sailing wing as shown in FIG. 3 such that the retention member 302 is oriented to receive a foot with the toes pointing towards the centreline of the watercraft and with the length of the foot substantially perpendicular to the direction of motion 306 (or the centreline) of the watercraft.
  • the sailor may also lower his body using portions of the sole his feet to leverage upon an outer edge of the sailing wing until his body is substantially parallel to the surface of the water when trapezing.
  • the assembly 300 is disposed at a proximal outer edge of a sailing wing of a watercraft (as shown in FIG. 3).
  • the retention member 302 is elastic or defines an aperture that is sufficiently big to provide sufficient room or give, to allow a foot received therein to be angled upward from a rearfoot portion away from the surface which the assembly 300 is disposed on.
  • FIG. 4A is a schematic drawing showing a top plan view of a foot 406 when secured in an assembly 400 comprising a retention member 402 in the default position 418 when a watercraft is moving in a direction 412, in an exemplary embodiment.
  • the assembly 400 comprising a retention member 402, functions substantially similarly to the assembly 100 and the assembly 300 of FIGS. 1 -3.
  • the assembly comprises a centre or pivot 404 that aligns with the centre or pivot of the retention member 402 and the centre or pivot of a rotatable member hidden under the foot 406 and thus not shown in this top plan view FIG. 4A.
  • the retention member 402 may receive and secure the foot 406 such that the length of the received foot 406 is substantially perpendicular to the direction of motion 412 or the centreline of the watercraft (not shown).
  • the retention member 402 comprises a front edge 416 nearer to the bow of a watercraft and a back edge 414 nearer to the stern of a watercraft, the front edge 416 and the back edge 414 being fixedly or removably attached to the rotatable member.
  • an axis that joins at least a portion of the front edge 416 and at least a portion of the back edge 414 is substantially parallel to the direction of motion 412.
  • the dotted line S passing through the centre or pivot 404 is used as a reference line to illustrate subsequent rotations.
  • the midfoot and/or forefoot portion 408 (408 denotes that non-rearfoot portion) of the foot 406 may also decelerate from a high velocity due to a reactive force exerted by the retention member 402 disposed on the watercraft.
  • a rearfoot portion 410 of the foot 406 that is not in contact with or secured with the retention member 402 may continue to move in the direction 412 at the high velocity due to inertia.
  • a large twisting force may be exerted on the ankles, the metatarsal bones and potentially the knees, resulting in injuries to the sailor.
  • the momentum of the rearfoot may result in a clockwise rotational force or torque being applied to the retention member 402.
  • the retention member 402 is coupled to a rotatable member, this results in a rotational force or torque being applied to the rotatable member.
  • the torque exceeds a pre-determined threshold, for example when there is a sharp deceleration, the rotatable member may rotate upon itself about the pivot axis 404.
  • the retention member 402 (and the foot 406 received within) similarly rotate about the pivot axis 404 in a clockwise manner.
  • the rotatable member and the retention member 402 rotate in a clockwise manner during a sharp deceleration, when the assembly 400 is mounted or disposed on the port side of the watercraft. Conversely, when the assembly 400 is mounted or disposed on the starboard side of the watercraft, the rotatable member and retention member 402 rotate in an anti-clockwise manner during a sharp deceleration.
  • the retention member 402 and the foot 406 received therein are rotated by an angle ⁇ ' with respect to the reference line S to a first rotated position 420.
  • rotation of the retention member 402 enables the forefoot portion and/or the midfoot portion 408 received therein to move in a substantially concerted manner with the unsecured rearfoot portion 410, thereby mitigating and/or sparing the ankles, the metatarsal bones and the knees from potentially experiencing any large twisting forces or strain and reducing the chances of injuries.
  • the force applied on the edges 414, 416 of the retention member 402 caused by momentum of the person's body is no longer substantially parallel to the axis that joins the front edge 416 and the back edge 414 (i.e., along the length of the strap) , and may instead be substantially perpendicular to the axis.
  • this allows the foot 406 to be dislodged/disengaged/ejected from the retention member 402, safely releasing the sailor from the retention member 402 and watercraft.
  • the retention member reverts to its default position 418 after dislodgement/disengagement/ejection of the foot 406.
  • the rotatable member may rotate the retention member 402 in an anti-clockwise manner such that it reverts to its default position (as shown in FIG. 4A) by virtue of a restoring force applied by the biasing member such as e.g., a torsional spring comprised therein.
  • the assembly 400 does not require manual reset to the default position.
  • FIG. 4C is a schematic drawing showing a top plan view of a position of the foot 406 when the retention member 402 is in a second rotated position 422.
  • a larger rotational force or torque may be applied to the rotatable member which may cause the retention member 402 to be rotated clockwise by a greater angle ⁇ " with reference to reference line S to a second rotated position 422.
  • the force caused by momentum of the person's body may also allow the foot 406 to be dislodged or ejected from the retention member 402.
  • the retention member 402 in the second rotated position 422 may eject the foot 406 in a different direction, angle or time as compared to when the retention member 402 is in the first rotated position 420 as shown in FIG. 4B.
  • the second rotated position is the maximal rotated position of the retention member 402 beyond which the retention member 402 may not be further rotated clockwise.
  • the assembly 400 may comprise one or more stop members for limiting the rotation of the retention member 402 and the rotatable member.
  • FIG. 5A is a schematic drawing showing a bottom plan view of an assembly in a default position in accordance with an exemplary embodiment.
  • the assembly 500 functions substantially similarly to the assemblies 100, 300 and 400 of FIGS. 1 -4.
  • the assembly 500 comprises stop members 508 and 510.
  • stop member in the form of protrusion 508 projects from a bottom surface of the rotatable member 504 i.e.
  • the stop member in the form of stopper 510 may project from a portion of the watercraft or where the assembly 500 comprises a housing, from a base on the housing.
  • the stop member 510 is positioned such that it lies in the path of stop member 508 when the stop member 508 is rotated clockwise in tandem with rotatable member 504.
  • the stop member 508 is therefore configured to meet with the stop member 510 to prevent a further rotation of the rotatable member 504.
  • the protrusion 508 moves along a rotational path in tandem with rotation of the rotatable member. Positioning the stopper 510 at a point on the rotational path prevents further rotation of the rotatable member 504.
  • FIG. 5B is a schematic drawing showing a bottom plan view of the assembly of FIG. 5A in a maximal rotated position in accordance with an exemplary embodiment.
  • the rotatable member 504 is rotated clockwise from its default position and the stop member 508 projecting therefrom comes into contact with the stop member 510.
  • both stop members 508 and 510 are rigid, further clockwise rotation of the rotatable member 504 is prevented, and the rotatable member 504 is therefore at its maximal rotated position.
  • stop members 508 and 510 act as mechanical limiters to prevent the assembly 500 from rotating past a set or predetermined point.
  • the assembly is configured to rotate to the maximum angle and be mechanically limited during instances of high deceleration such as e.g., high speed collisions.
  • high deceleration such as e.g., high speed collisions.
  • the deceleration force may not be enough to fully extend the biasing member in the form of a torsional spring 504 such that the stop member 508 projecting from the rotatable member 504 does not reach the stop member 510.
  • the example embodiments are directed at addressing injuries resulting from the more dangerous former scenario of e.g., high speed collisions.
  • the rotatable member 504 by virtue of the biasing strength of the biasing member in the form of a spring 506, is configured to rotate to the maximal rotated position when there is a sharp or high deceleration of the watercraft in the magnitude typical of that during a serious emergency/accident/collision/broach.
  • the deceleration force is less and this translates to a smaller extension of the spring. Consequently, the rotatable member 504 may not reach the maximal rotated position, and a received foot may not be dislodged or ejected from the retention member 502.
  • the deceleration force is less, the potential for serious injury is also reduced.
  • the retention member and/or the rotatable member is configured to remain substantially stationary in the default position during such normal motion. Therefore, the threshold rotational force or torque is configured to be more than the rotational force or torque exerted on the retention member and/or the rotatable member during a normal motion condition of the watercraft.
  • the assembly disclosed herein may function like a rigid foot-retaining assembly such as a rigid foot strap during normal motion condition, with the rotation of the assembly only activated when during an emergency, a crash or a broach.
  • a sharp deceleration exceeding 20 m/s 2 - 50 m/s 2 may be considered an emergency, a crash or a broach and the threshold rotational force or torque may be configured accordingly.
  • the threshold torque may be determined or fine-tuned by determining the typical torque applied to the assembly during normal sailing of the watercraft in various wind and wave condition, and also the torque applied to the assembly during a sudden deceleration. It may be further appreciated that the threshold torque may be determined or fine- tuned by determining the typical torque applied to the assembly during normal sailing of the watercraft in various wind and wave condition , and also the torque applied to the assembly during a sudden deceleration.
  • the threshold rotational force or torque required to rotate the rotatable member may be varied by varying a stiffness of the spring.
  • An example below shows how a suitable spring stiffness may be computed for a torsional spring.
  • Tmax Maximum torque exerted by body onto torsional spring
  • Omax maximum range of travel of torsional spring
  • Vmax Maximum velocity of boat
  • m typical mass of a sailor
  • V ma x to be 10 m/s
  • m to be 80 kg and the collision time to be 0.5s
  • e ma x to be ⁇ /2
  • the suitable torsional spring stiffness is computed to be 122 Nm/rad.
  • the suitable torsional spring stiffness is computed to be 306 Nm/rad.
  • the torsional spring stiffness is from 100 Nm/rad to 1000 Nm/rad inclusive.
  • the biasing member in the form of a spring is adjustable or replaceable to vary, tune, regulate or control variables including the threshold rotational force/torque, the rotated position, a biasing strength of the biasing member, or an ejection direction, angle or time of the user.
  • the length of the spring when the rotatable member is in its default unrotated position may be adjusted to vary a preload of the spring, and thereby vary a force or strength of the spring.
  • Such methods of adjusting the preload of a spring are known to the person skilled in the art.
  • one or both ends of the spring may be displaced to be affixed to a different point on the watercraft (directly or indirectly through a bracket) and/or to a different point on the rotatable member to vary an initial extension of the spring and therefore a preload of the spring.
  • a plurality of brackets for coupling to an end of a spring may be predisposed at distinct points on the rotatable member and/or portions of the watercraft to facilitate adjustment to the length of the spring.
  • the compression spring may be wound around a structure with one or both ends of the spring bound by threaded bolts or nuts or lock nuts, and the length of the spring may be reduced from its free length to introduce a particular preload by adjusting the threaded bolts or nuts or lock nuts by hand or a C-spanner.
  • preload adjusters such as a hydraulic spring preload adjuster or a pneumatic spring preload adjuster may also be used to vary a preload of the spring.
  • the force of a spring depends on the preload, which in turn depends on the initial extension or compression of the spring. Therefore, by extending or compressing the spring e.g.
  • the preload can be adjusted to be higher or lower, thereby making the spring stronger or weaker.
  • the preload at the default position
  • the preload becomes reduced and the spring requires a smaller force to move.
  • the threshold rotational force/torque may therefore be adjusted accordingly without replacing the spring. This method may allow for the threshold rotational force/torque to be finely-tuned, as the length of the spring may be adjusted finely.
  • the spring may be replaced completely with another spring of a different stiffness/ spring constant.
  • FIGS. 4A-4C and 5A-5B illustrate a clockwise rotation of an assembly from the default, unrotated position
  • embodiments of the assembly may also rotate in an anti-clockwise manner from the default, unrotated position when embodiments of the assembly are disposed on an opposite side of a watercraft from that illustrated in FIGS. 4A-4C and 5A-5B.
  • FIG. 6A is a drawing showing a perspective view of an apparatus or combined assembly 600 comprising a pair of assemblies - a first assembly 602 and a second assembly 604 in accordance with an exemplary embodiment disclosed herein.
  • Each of the first assembly 602 and the second assembly 604 functions substantially similarly to the assemblies 100, 300, 400 and 500 of FIGS. 1 -5.
  • the apparatus or combined assembly 600 when the apparatus or combined assembly 600 is disposed on a watercraft, the first assembly 602 and the second assembly 604 are disposed substantially adjacent to each other along a direction substantially parallel to the centreline of watercraft.
  • the rotatable member 608 of the first assembly 602 and the rotatable member 612 of the second assembly 604 may be rotatable upon themselves and about respective axis X' and X", each axis substantially parallel with each other, and respectively substantially perpendicular to a surface of the apparatus or combined assembly 600.
  • the retention member 606 coupled to the rotatable member 608, and the retention member 610 coupled to the rotatable member 612 may therefore also rotate about the axis X' and X" respectively.
  • the rotatable members 608 and 612 and the retention members 606 and 610 are in their default, unrotated positions.
  • the default, unrotated position of the assembly 602 with respect to the axis X' is the same as the default, unrotated position of the assembly 604 with respect to the axis X".
  • FIG. 6B is a drawing showing a perspective view of the apparatus of FIG. 6A when the assembly 602 and the assembly 604 are in their rotated positions in accordance with an exemplary embodiment disclosed herein.
  • the rotated position of the assembly 602 with respect to the axis X' is different from the rotated position of the assembly 604 with respect to the axis X".
  • the assembly 602 may rotate by an angle different than that of the assembly 604.
  • FIG. 7 is a drawing showing a bottom perspective view of an apparatus 700 disposed on a sailing wing 712 in accordance with an exemplary embodiment disclosed herein.
  • the apparatus 700 functions substantially similarly to the apparatus 600 in FIG. 6.
  • each of the first assembly 702 and second assembly 704 further comprises a respective biasing member 708 and a biasing member 710, disposed at the bottom of the assemblies.
  • the biasing member 708 and the biasing member 710 may be sealed or covered from an underside of the sailing wing or otherwise exposed on an underside of the sailing wing.
  • the seal or cover may be removed to allow for easy access to the biasing member when adjustment of e.g., the threshold torque or strength of the spring is required.
  • the biasing member is made of stainless steel, optionally marine-grade stainless steel.
  • FIG. 8A is a schematic drawing showing a top plan view of each foot 806 and 808 when secured in a first assembly 802 and a second assembly 804 respectively in an apparatus 800 in accordance with an exemplary embodiment disclosed herein.
  • the apparatus 800 functions substantially similarly to the apparatuses 600 and 700 in FIGS. 6 and 7.
  • FIG. 8B is a schematic drawing illustrating a momentum of a rearfoot portion of each foot 806 and 808 when there is a deceleration of the watercraft moving in the direction of 810.
  • the momentum of the unsecured rearfoot portion of each foot 806 and 808 may be in the direction of 816 and 818 respectively, both of which are parallel to the direction of motion of the watercraft 810.
  • the momentum may cause a clockwise torque to be applied to the assembly 802 and the assembly 804.
  • the assembly 802 and the assembly 804 rotate in a clockwise direction
  • FIG. 8C is a schematic drawing showing a top plan view of a position of each foot 806 and 808 when the first assembly 802 and the second assembly 804 are in their respective rotated positions 820 and 822.
  • the first assembly 802 (and therefore the foot 806 received therein) is rotated by an angle ⁇ 1 from the reference line S1 to a position 820 while the second assembly 804 (and therefore the foot 808 received therein) is rotated by a different angle ⁇ 2 from the reference line S2 to a position 822.
  • the rotated position 820 is a maximal rotated position of the first assembly 802.
  • the rotated position 822 is a maximal rotated position of the second assembly 804.
  • the rotated position or the maximal rotated position of the first assembly 802 is different from the rotated position or the maximal rotated position of the first assembly 804 at any given time or condition.
  • the momentum of the foot 806 is in the direction of 824 and the momentum of the foot 808 is in the direction 826, both directions of which are substantially parallel to the direction of motion 810.
  • FIG. 8D is a schematic drawing showing a top plan view of a position of each foot 806 and 808 after ejection from the first assembly 802 and the second assembly 804.
  • the force applied by the sailors on the retention members 802 and 804 (caused by momentum of the sailors' body) is no longer substantially parallel along the length of the strap. Given the momentum of the sailors in the direction of motion 810, this allows their feet 806 and 808 to be dislodged/disengaged/ejected from their respective retention members 802 and 804, safely releasing the sailors from their retention members and watercraft.
  • the momentum of the sailor's body causes the foot 806 and the foot 808 to be ejected or dislodged from the assembly 802 and the assembly 804 respectively in the direction of 828 and 830 respectively.
  • a user whose foot 806 is retained in the first assembly 802 may be ejected or flung from the first assembly 802 in a different direction from another user whose foot 808 is retained in the second assembly 804 due to the different maximal positions of the respective assemblies 802, 804, such that the two users do not collide in their ejection paths.
  • the first assembly 802 is located nearer to a bow of a watercraft and the second assembly 804 is located nearer to the stern of a watercraft, and the angle ⁇ 1 is greater than the angle ⁇ 2 at any given time or condition during a sharp deceleration.
  • the first assembly 802 when the apparatus 800 is disposed on a starboard side of the watercraft moving in the direction 810, the first assembly 802 is located nearer to a stern of a watercraft and the second assembly 804 is located nearer to the bow of a watercraft, and the angle of anti-clockwise rotation of the first assembly 802 from the default position is smaller than the angle of that of the second assembly 804 at any given time or condition during a sharp deceleration.
  • biasing strength of a biasing member of the first assembly 802 may be different from that of the second assembly 804 in order to provide for different release angles when similar torques are provided.
  • stiffness or the preload of a spring of the first assembly 802 may be different from that of the second assembly 804.
  • threshold torque required to rotate the assembly 802 may also be different from that of the second assembly 804.
  • FIG. 9A is a schematic drawing showing a bottom plan view of an apparatus in a default position in accordance with an exemplary embodiment.
  • the apparatus 900 functions substantially similarly to the apparatuses 600, 700 and 800 of FIGS. 6-8.
  • the apparatus 900 comprises a first assembly 902 comprising a pair of stop members 906 and 910, and a second assembly 904 comprising a pair of stop members 908 and 912.
  • stop members 906 and 908 project a bottom surface of the rotatable members 914 and 916 respectively i.e. opposite the surface where the retention members 918 and 920 are disposed.
  • the stop members 910 and 912 may project from a portion of the watercraft or a base of the apparatus 900.
  • the stop member 910 is positioned such that it lies earlier in the path of stop member 906 when the stop member 906 is rotated clockwise in tandem with rotatable member 914, whereas the stop member 912 is positioned such that it lies later in the path of stop member 908 when the stop member 908 is rotated clockwise in tandem with rotatable member 916. That is, the rotatable member 916 has to rotate by a greater angle from the default position before the stop member 908 projecting therefrom contacts the stop member 912, as compared to a small angle of rotation required by the rotatable member 914 before the stop member 906 projecting therefrom contacts the stop member 910.
  • FIG. 9B is a schematic drawing showing a bottom plan view of the apparatus of FIG. 9A in a maximal rotated position in accordance with an exemplary embodiment.
  • the first assembly 902 and the second assembly 904 are rotated clockwise from their default positions and the stop members 906 and 908 come into contact with the stop members 910 and 912 respectively.
  • the stop members are rigid, further clockwise rotation of the assemblies 902 and 904 are prevented, and the assemblies 902 and 904 are therefore in their respective maximal rotated positions.
  • the stop member 910 is positioned earlier along the path of clockwise rotation of the rotatable member from the default position.
  • the maximum rotated angle of the first assembly 902 is therefore smaller than that of the second assembly 904.
  • this allows a user of the first assembly 902 to eject from a different angle from another user of the second assembly 904 when the assemblies are in their respective maximal rotated positions, thereby minimising the chances of the two users colliding with each other in their ejection paths.
  • the apparatus comprising a first assembly and a second assembly may each secure a left foot of two sailors or a right foot of two sailors when the sailors are trapezing.
  • Coupled or “connected” as used in this description are intended to cover both directly connected or connected through one or more intermediate means, unless otherwise stated.
  • adjacent refers to one element being in close proximity to another element and may be but is not limited to the elements contacting each other or may further include the elements being separated by one or more further elements disposed therebetween.
  • the assembly and the apparatus are devoid of a power source. In various embodiments, the assembly and the apparatus are devoid of an electrical power source or any sources that directly or indirectly produce electrical energy.
  • the assembly and the apparatus comprise a mechanized assembly or apparatus.
  • the retention member of the assembly and the apparatus is made of a soft and/or a conformable material suitable for conforming to the shape of a foot received therein.
  • the retention member is not made of a hard material such that it is unsuitable for conforming to the shape of a foot received therein. It will be appreciated that that the retention member may secure a foot more effectively when it conforms to the shape of the foot.
  • the retention member of the assembly and the apparatus is made of a substantially elastic material such that it is suitable for allowing a foot received therein to be angled upward away from the surface on which the assembly or the apparatus is disposed on.
  • the retention member remains substantially intact during its rotation.
  • materials suitable for the retention member include but are not limited to carbon fibre, fibreglass, high strength textiles, rubber or the like.
  • the rotatable member comprises a rotary pivot or a rotary bearing to allow for the rotation to occur.
  • rotary pivot and rotary bearing include but are not limited to pivot bearing, roller bearing, ball bearing and the like.
  • a ball bearing may comprise an outer ring, an inner ring and a plurality of balls disposed between the outer ring and the inner ring.
  • the outer ring may be fixed to at least a portion of the watercraft whereas the inner ring may be directly coupled to the rotatable member opposite the surface where the retention member is coupled.
  • a watercraft comprising the assembly or the apparatus.
  • the watercraft comprises a foiling watercraft or a non-foiling watercraft.
  • the watercraft is selected from the group consisting of: sailboat, skiff, dinghy, catamaran, trimaran, surfboard, kitesurfing board, windsurfing board and wakeboarding board.
  • reference to a foot herein comprises reference to a shoe or any footwear in which a foot may be disposed.
  • FIG. 10 is a flowchart 1000 illustrating a method of securing a foot of a person onto a surface of a watercraft, in an exemplary embodiment.
  • a retention member for receiving and securing the foot of in a default position is provided.
  • the retention member is coupled to a rotatable member.
  • the rotatable member allows the retention member to be rotated upon itself and about an axis substantially perpendicular to the surface of the watercraft.
  • the rotatable member is allowed to rotate the retention member from the default position to a rotated position when a torque applied to the rotatable member exceeds a threshold.
  • the method may further comprise the step of biasing the retention member to the default position with a biasing member.
  • the step of providing a retention member for receiving and securing the foot may comprise securing the received foot such that length of the received foot is substantially perpendicular to a direction of motion of the watercraft in the default position.
  • the rotatable member may allow the retention member to be rotated from between more than 0° and 90° from the default position.
  • the method may further comprise providing a stop member to prevent a further rotation of the rotatable member, when the rotatable member has rotated to a maximal rotated position.
  • the stop member comprises a protrusion projecting from a surface of the rotatable member, such that the protrusion moves along a rotational path in tandem with rotation of the rotatable member, and positioning a stopper at a point on the rotational path prevents further rotation of the rotatable member.
  • the method may further comprise configuring the rotatable member to comprise a maximal rotated position, wherein the maximal rotated position comprises a position where retention member is rotated from between 30° and 90° from the default position.
  • the step of providing a retention member may comprise providing a midfoot strap.
  • the rotatable member may comprise a rotary pivot or a rotary bearing.
  • the method may further comprise adjusting the biasing member to vary the threshold, the rotated position, the maximal rotated position or a biasing strength of the biasing member.
  • the biasing member comprises a torsional spring or a linear spring.
  • the stiffness of the torsional spring may be from 100 Nm/rad to 1000 Nm/rad.
  • the threshold is more than the torque applied to the rotatable member during normal motion condition of the watercraft without sharp deceleration.
  • the exposed area of the rotatable member may be flush with the surface of the watercraft.
  • the retention member may be devoid of a power source.
  • the rotatable member is configured to be rotatable in the anti-clockwise direction from the default position, when the rotatable member is disposed on the starboard side of the watercraft.
  • the rotatable member is configured to be rotatable in the clockwise direction from the default position, when the rotatable member is disposed on the port side of the watercraft.
  • a method of securing a pair of feet onto a surface of a watercraft may comprise providing a pair of first and second assemblies, wherein the first assembly is configured to provide a first rotated position that is at a different angle from the rotated position of the second assembly.
  • a biasing strength of a biasing member of the first assembly is different from a biasing strength of a biasing member of the second assembly.
  • a stiffness of a spring of the first assembly is different from a stiffness of a spring of the second assembly.
  • embodiments of the assembly and apparatus disclosed herein are torque-sensitive and may release the foot when the foot applies a certain level of torque to the assembly.
  • the torque required for release may only present during sudden deceleration and hence embodiments of the assembly and apparatus may only activate release in times of emergencies. At all other times, embodiments of the assembly and apparatus may operate and function just like a static foot strap.
  • embodiments of the present application seek to advantageously provide, through improved equipment design, reduced incidences of sailing injuries, while faster boats gain popularity worldwide.
  • embodiments of the assembly and apparatus operate by way of a passive mechanism/mechanical system (i.e. no active power required for operation).
  • Embodiments of the assembly and apparatus may harness deceleration forces for safe, controlled, regulated and coordinated release of two sailors, for example a skipper and a crew, to spare the foot, ankle and knee from excessive rotational, valgus and traction forces.
  • Embodiments of the assembly and apparatus do not require the sailors to manually release the assembly and apparatus to free themselves.
  • Embodiments of the assembly and apparatus allow for quick release of the sailors during a sharp deceleration.
  • the exemplary embodiment of the combined assembly as illustrated in e.g., FIG. 6-9, may further advantageously avoid potential serious collisions between the two sailors when they are ejected from a watercraft, as they are ejected in different angles.
  • embodiments of the assembly and apparatus may be further customized or individualized according to the user to maximize their operation performance. For example, to determine the ideal threshold torque for rotating the assembly and apparatus for a user, on- water measurements of the typical torque exerted by the user during normal sailing in various wind and wave conditions, as well as the torque exerted during a sudden deceleration may be evaluated.
  • embodiments of the assembly and apparatus described herein may be introduced to competitive high performance boats, specifically the 49er and 49er FX, to reduce the high injury rates amongst competitive sailors.
  • Embodiments of the assembly and apparatus described herein may also be introduced to more types of boats (e.g. the Olympic catamaran class, the Nacra 17) and boards as well (e.g. kitesurfing boards, windsurfing boards, wakeboarding boards). Boat- and board-builders from around the world may therefore also stand to benefit.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Toys (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un ensemble pour fixer un pied d'une personne sur une surface d'un véhicule nautique, ledit ensemble comprenant : un élément de retenue destiné à recevoir et fixer le pied dans une position par défaut; et un élément rotatif accouplé à l'élément de retenue pour permettre à l'élément de retenue de tourner sur lui-même et autour d'un axe sensiblement perpendiculaire à la surface du véhicule nautique; l'élément rotatif étant conçu pour faire tourner l'élément de retenue de la position par défaut à une position mise en rotation lorsqu'un couple appliqué à l'élément rotatif dépasse un seuil. L'invention concerne également des appareils associés, des véhicules nautiques et des procédés de fixation d'un pied d'une personne sur une surface d'un véhicule nautique.
PCT/SG2018/050148 2017-03-31 2018-03-28 Ensemble de fixation de pied et procédés associés WO2018182519A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SG11201907586YA SG11201907586YA (en) 2017-03-31 2018-03-28 A foot-securing assembly and related methods
CN201880022589.1A CN110475592B (zh) 2017-03-31 2018-03-28 脚固定组件和相关方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG10201702672R 2017-03-31
SG10201702672R 2017-03-31

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WO2018182519A1 true WO2018182519A1 (fr) 2018-10-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179424A2 (fr) * 1984-10-24 1986-04-30 Gerhard Schäfer Planche pour le surf
US4964649A (en) * 1989-03-15 1990-10-23 Chamberlin Justin M Snowboard boot binder attachments
WO2000050130A1 (fr) * 1999-02-26 2000-08-31 Beacon Systems, Llc Systeme de fixation pour planche de sport
US20070007735A1 (en) * 2005-07-11 2007-01-11 Stefanic Daniel M Freely rotatable binding for board sports with internal resilience and safety lock
US7837219B1 (en) * 2007-06-20 2010-11-23 Cordes David W Binding assembly for a sports board
US20120227651A1 (en) * 2009-11-26 2012-09-13 Kuentzel Henning Rotatable Footstrap Plate And Footstrap Assembly For Gliding Boards

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2410008Y (zh) * 2000-01-05 2000-12-13 简瑜泽 改进的雪靴固定座角度调节装置
DE602004001340T2 (de) * 2003-02-20 2007-06-14 Jean-Pierre Edmond Bindung zur befestigung eines schuhs an einem schneegleitbrett
US7674328B2 (en) * 2003-03-25 2010-03-09 Hewlett-Packard Development Company, L.P. Dye-based ink
US20060051510A1 (en) * 2004-09-03 2006-03-09 Kempe Steven A Aesthetic applied cellulose material
US8276921B2 (en) * 2009-09-04 2012-10-02 Brendan Walker Snowboard binding

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179424A2 (fr) * 1984-10-24 1986-04-30 Gerhard Schäfer Planche pour le surf
US4964649A (en) * 1989-03-15 1990-10-23 Chamberlin Justin M Snowboard boot binder attachments
WO2000050130A1 (fr) * 1999-02-26 2000-08-31 Beacon Systems, Llc Systeme de fixation pour planche de sport
US20070007735A1 (en) * 2005-07-11 2007-01-11 Stefanic Daniel M Freely rotatable binding for board sports with internal resilience and safety lock
US7837219B1 (en) * 2007-06-20 2010-11-23 Cordes David W Binding assembly for a sports board
US20120227651A1 (en) * 2009-11-26 2012-09-13 Kuentzel Henning Rotatable Footstrap Plate And Footstrap Assembly For Gliding Boards

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Publication number Publication date
CN110475592B (zh) 2021-08-06
CN110475592A (zh) 2019-11-19
SG11201907586YA (en) 2019-09-27

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