Swimming device with retractable fins

The swimming device of claim number 1;

• wherein said left fin comprising a left fin base and a left fin planar section which is attached to said left fin base;
• wherein, said left fin has a left axis of symmetry;
• wherein a left axis of symmetry vector is defined as a vector which coincides with said left axis of symmetry and is pointing from said left fin base towards said left fin planar section;
• wherein said right fin comprising a right fin base and a right fin planar section which is attached to said right fin base;
• wherein, said right fin has a right axis of symmetry;
• wherein a right axis of symmetry vector is defined as a vector which coincides with said right axis of symmetry and is pointing from said right fin base towards said right fin planar section;
• wherein, an inner product angle between two vectors is defined as an angle having values which are in the range of 0 to 180 degrees;
• wherein, said left sole has a left sole plane;
• wherein, a left vertical vector is defined as a vector which is perpendicular to said left sole plane and is pointing upwards;
• wherein, said left fin's position is defined by a left slant angle and by a left tilt angle;
• wherein said left tilt angle is defined as said inner product angle between said left vertical vector and said left axis of symmetry vector;
• wherein said left slant angle is defined as said inner product angle between said left vertical axis vector and said left axis vector;
• wherein said left fin is in said left walking position when said left fin has a predetermined said left tilt angle which is within the range of 0 to 90 degrees and a predetermined said left slant angle which is within the range of 90 to 180 degrees;
• wherein said left fin is in said left swimming position when said left fin has a predetermined said left tilt angle which is within the range of 90 to 180 degrees and a predetermined said left slant angle which is within the range of 90 to 180 degrees;
• wherein, said right sole has a right sole plane;
• wherein, a right vertical vector is defined as a vector which is perpendicular to said right sole plane and pointing upwards;
• wherein, said right fin's position is defined by a right slant angle and by a right tilt angle;
• wherein said right tilt angle is defined as said inner product angle between said right vertical vector and said right axis of symmetry vector;
• wherein said right slant angle is defined as said inner product angle between said right vertical axis vector and said right axis vector;
• wherein said right fin is in said right walking position when said right fin has a predetermined said right tilt angle which is within the range of 0 to 90 degrees and a predetermined said right slant angle which is within the range of 90 to 180 degrees;
• wherein said right fin is in said right swimming position when said right fin has a predetermined said right tilt angle which is within the range of 90 to 180 degrees and a predetermined said right slant angle which is within the range of 90 to 180 degrees.

The swimming device of claim number 4, wherein said left fin planar section is made of elastic and resilient material;

• wherein said left fin base is made of elastic and resilient material;
• wherein said right fin planar section is made of elastic and resilient material;
• wherein said right fin base is made of elastic and resilient material;
• wherein said left fin base has said left bearing which is mounted on said left shaft;
• whereby said left fin can be rotated around said left axis with respect to said left shoe;
• in addition, said right fin base has said right bearing which is mounted on said right shaft;
• whereby said right fin can be rotated around said right axis with respect to said right shoe.

The swimming device of claim number 6, wherein said left positioning mechanism comprising a left member, which is attached to said left fin;

• said left member has a set of left protrusions;
• wherein said left bearing comprising a set of left walking recesses and a set of left swimming recesses;
• wherein said left positioning mechanism can lock said left fin at said left walking position by inserting said set of left protrusions into said set of left walking recesses;
• also, said left positioning mechanism can lock said left fin at said left swimming position by inserting said set of left protrusions into said set of left swimming recesses;
• said user can switch position of said left fin from said left walking position into said left swimming position by temporarily removing said set of left protrusions from said set of left walking recesses, next rotating said left fin into said left swimming position and then inserting said set of left protrusions into said set of left swimming recesses;
• said user can switch position of said left fin from said left swimming position into said left walking position by temporarily removing said set of left protrusions from said set of left swimming recesses, next rotating said left fin into said left walking position and then inserting said set of left protrusions into said set of left walking recesses;
• in addition, said right positioning mechanism comprising a right member, which is attached to said right fin;
• said right member has a set of right protrusions;
• wherein said right bearing comprising a set of right walking recesses and a set of right swimming recesses;
• wherein said right positioning mechanism can lock said right fin at said right walking position by inserting said set of right protrusions into said set of right walking recesses;
• also, said right positioning mechanism can lock said right fin at said right swimming position by inserting said set of right protrusions into said set of right swimming recesses;
• said user can switch position of said right fin from said right walking position into said right swimming position by temporarily removing said set of right protrusions from said set of right walking recesses, next rotating said right fin into said right swimming position and then inserting said set of right protrusions into said set of right swimming recesses;
• said user can switch position of said right fin from said right swimming position into said right walking position by temporarily removing said set of right protrusions from said set of right swimming recesses, next rotating said right fin into said right walking position and then inserting said set of right protrusions into said set of right walking recesses.

The swimming device of claim number 7, wherein said left member comprising a left polygonal bar;

• said left shaft comprising a left polygonal cavity which is centered along said left axis;
• wherein said left polygonal bar fits into said left polygonal cavity;
• wherein said left polygonal cavity allows said left polygonal bar to move along said left axis but not to rotate around said left axis;
• wherein said left polygonal bar has a left inner square cavity which has a left inner square floor with a left round hole;
• wherein said left inner square cavity contains a left round bar and a left compression spring which is wound around said left round bar;
• wherein said left round bar has a left square head which fits into said left inner square cavity;
• said left round bar has a left round bar lower section which passes through said left round hole and is anchored to said left heel;
• wherein said left compression spring is pre-compressed inside said left inner square cavity between said left square head and said left inner square floor;
• wherein said left compression spring has a bias which tends to push said left member along said left axis towards said left heel;
• whereby, said left fin, which is attached to said left member is also being pushed towards said left heel;
• wherein, left fin is fastened to said left heel;
• said compression spring bias also tends to push said set of left protrusions into said set of left walking recesses when said left fin is rotated into said left walking position;
• thereby, locking said left fin in said left walking position since said set of left protrusions are connected to said left member which cannot rotate around said left axis with respect to said left shoe;
• said compression spring bias also tends to push said set of left protrusions into said set of left swimming recesses when said left fin is rotated into said left swimming position;
• thereby, locking said left fin in said left swimming position since said set of left protrusions are connected to said left member which cannot rotate around said left axis with respect to said left shoe;
• when said user wants to switch said left fin from said left walking position into said left swimming position or vice versa, said user has to unlock said left fin by pulling backwards said left member against bias of said left compression spring, rotate said left fin into a new left position and stop pulling said left member such that said left member locks said left fin in said new left position;
• pulling backwards said left member unlocks said left fin since pulling removes said set of left protrusions either from said set of left walking recesses or from said set of swimming recesses;
• wherein said right member comprising a right polygonal bar;
• said right shaft comprising a right polygonal cavity which is centered along said right axis;
• wherein, said right polygonal bar fits into said right polygonal cavity;
• wherein, said right polygonal cavity allows said right polygonal bar to move along said right axis but not to rotate around said right axis;
• wherein, said right polygonal bar has a right inner square cavity which has a right inner square floor with a right round hole;
• wherein, said right inner square cavity contains a right round bar and a right compression spring wound around said right round bar;
• wherein, said right round bar has a right square head which fits into said right inner square cavity;
• wherein, said right round bar has a right round bar lower section which passes through said right round hole and is anchored to said right heel;
• wherein, said right compression spring is pre-compressed inside said right inner square cavity between said right square head and said right inner square floor;
• wherein said right compression spring has a bias which tends to push said right member along said right axis towards said right heel;
• whereby, said right fin, which is attached to said right member is also being pushed towards said right heel;
• thereby, left fin is fastened to said left heel;
• said compression spring bias also tends to push said set of right protrusions into said set of right walking recesses when said right fin is rotated into said right walking position;
• whereby, locking said right fin in said right walking position since said set of right protrusions are connected to said right member which cannot rotate around said right axis with respect to said right shoe;
• wherein, said compression spring bias also tends to push said set of right protrusions into said set of right swimming recesses when said right fin is rotated into said right swimming position;
• thereby, locking said right fin in said right swimming position since said set of right protrusions are connected to said right member which cannot rotate around said right axis with respect to said right shoe;
• when said user wants to switch said right fin from said right walking position into said right swimming position or vice versa, said user has to unlock said right fin by pulling backwards said right member against bias of said right compression spring, rotate said right fin into a new right position and stop pulling said right member such that said right member locks said right fin in said new right position;
• wherein, pulling backwards said right member unlocks said right fin since pulling removes said set of right protrusions either from said set of right walking recesses or from said set of swimming recesses.

The swimming device of claim number 7, wherein, a left bearing circle is defined as a planar circle centered at said left axis and perpendicular to said left axis vector;

• wherein said left bearing circle has a diameter which is equal to the diameter of said left bearing;
• wherein said left member has said set of left protrusions which includes:
• a left protrusion number 1 and a left protrusion number 2;
• said left protrusion number 1 and said left protrusion number 2 are positioned on said left bearing circle;
• wherein, angular spacing between said left protrusion number 1 and said left protrusion number 2 is:
• 180−2*Angle2 degrees measured in counterclockwise direction;
• wherein said Angle2 is equal to said left tilt angle;
• wherein said left protrusion number 1 is situated at Angle2 measured in counterclockwise direction from said left vertical vector;
• wherein said left protrusion number 2 is situated at:
• 180−Angle2 degrees measured in counterclockwise direction from said left vertical vector;
• wherein said set of left walking recesses and said set of left swimming recesses are positioned on said left bearing circle;
• wherein said set of left walking recesses includes:
• a left walking recess number 1 which is situated at zero degrees from said left axis of symmetry vector and a left walking recess number 2 situated at:
• 180−2*Angle2 degrees measured in counterclockwise direction from said left axis of symmetry vector;
• wherein said set of left swimming recesses includes:
• a left swimming recess number 1 which is situated at zero degrees measured from said left axis of symmetry vector and a left swimming recess number 3 situated at:
• 180+2*Angle2 degrees measured in counterclockwise direction from said left axis of symmetry vector;
• wherein, at said left walking position said left protrusion number 1 is inserted in said left walking recess number 1 and said left protrusion number 2 is inserted in said left walking recess number 2;
• wherein at said left swimming position said left protrusion number 1 is inserted in said left swimming recess number 3 and said left protrusion number 2 is inserted in said left swimming recess number 1;
• wherein, a right bearing circle is defined as said planar circle which is centered at said left axis and perpendicular to said left axis vector;
• wherein said right bearing circle has a diameter which is equal to the diameter of said right bearing;
• wherein said right member has said set of right protrusions which includes:
• a right protrusion number 1 and a right protrusion number 2;
• said right protrusion number 1 and said right protrusion number 2 are positioned on said right bearing circle;
• wherein, angular spacing between said right protrusion number 1 and said right protrusion number 2 is:
• 180−2*Angle2 degrees measured in clockwise direction;
• wherein said Angle2 is equal to said right tilt angle;
• wherein said right protrusion number 1 is situated at Angle2 measured in clockwise direction from said right vertical vector;
• wherein said right protrusion number 2 is situated at:
• 180−Angle2 degrees measured in clockwise direction from said right vertical vector;
• wherein said set of right walking recesses and said set of right swimming recesses are positioned on said right bearing circle;
• wherein said set of right walking recesses includes:
• a right walking recess number 1 which is situated at zero degrees from said right axis of symmetry vector and a right walking recess number 2, which is situated at:
• 180−2*Angle2 degrees measured in clockwise direction from said right axis of symmetry vector;
• wherein said set of right swimming recesses includes:
• a right swimming recess number 1 which is situated at zero degrees measured from said right axis of symmetry vector and a right swimming recess number 3 which is situated at:
• 180+2*Angle2 degrees measured in clockwise direction from said right axis of symmetry vector;
• wherein, at said right walking position said right protrusion number 1 is inserted in said right walking recess number 1 and said right protrusion number 2 is inserted in said right walking recess number 2;
• wherein at said right swimming position said right protrusion number 1 is inserted in said right swimming recess number 3 and said right protrusion number 2 is inserted in said right swimming recess number 1.

The swimming device of claim number 10, wherein said left latching mechanism comprising:

• a left latch, a left extension spring, a left anchoring screw and said left round bar;
• said left latch is a rectangular metal strip with a left central opening having a left opening ramp on the right hand side of said left central opening, a left spring hole at the left end of said left latch and a left latching hole at the right end of said left latch;
• said left round bar has said left square head and said left round bar lower section with a left notch and a left ending ramp;
• said left latch is housed in a left tunnel in said left heel of said left shoe;
• said left latch is anchored at said left spring hole to the right end of said left extension spring which is also housed at said left tunnel;
• the left end of said left extension spring is anchored to said left heel with said left anchoring screw;
• said left round bar lower section is being anchored to said left heel when said left opening ramp is inserted into said left notch;
• whereby, said left latching mechanism anchors and fastens said left fin to said left heel since said compression spring pushes said left member which is attached to said left fin towards said left heel;
• said user can detach said left fin from said left heel by pulling rightwards at said left latching hole;
• pulling rightwards at said left latching hole moves rightwards said left latch which in turn removes said left opening ramp from said left notch thus releasing said left round bar and said left fin from said left heel;
• when said user wants to attach said left fin to said left heel, said user pushes said left fin towards said left heel, which in turn pushes said left round bar and advances it towards said left latch;
• next, said left ending ramp slides on said left opening ramp and causes said left latch to slide rightwards until said round bar is able to pass through said left central opening;
• when said left latch slides rightwards it stretches said left extension spring;
• when said left round bar advances more through said left central opening said left notch reaches said left opening ramp and then said left latch springs back leftwards inserting its said left opening ramp into said left notch;
• whereby, anchoring said round bar to said left heel;
• thereby, said left fin also is anchored to said left heel because said left fin is connected to said left round bar;
• said user can detach said left fin from said left heel by pulling rightwards at said left latch which removes said left opening ramp from said left notch;
• thereby, releasing said left round bar and said left fin from said left heel;
• wherein said right latching mechanism comprising:
• a right latch, a right extension spring, a right anchoring screw and a right round bar;
• said right latch is a rectangular metal strip with a right central opening having a right opening ramp on the left hand side of said right central opening, a right spring hole at the right end of said right latch and a right latching hole at the left end of said right latch;
• said right round bar has said right square head and said right round bar lower section with a right notch and a right ending ramp;
• said right latch is housed in a right tunnel in said right heel of said right shoe;
• said right latch is anchored at said right spring hole to the left end of said right extension spring which is also housed at said right tunnel;
• the right end of said right extension spring is anchored to said right heel with said right anchoring screw;
• said right round bar lower section is anchored to said right heel when said right opening ramp is inserted into said right notch;
• whereby, said right latching mechanism anchors and fastens said right fin to said right heel since said compression spring pushes said right member which is attached to said right fin towards said right heel;
• said user can detach said right fin from said right shoe by pulling leftwards at said right latching hole;
• pulling leftwards at said right latching hole moves to the left said right latch which in turn removes said right opening ramp from said right notch thus releasing said right round bar and said right fin from said right heel;
• when said user wants to anchor said right fin to said right heel, said user pushes said right fin towards said right heel, which in turn pushes said right round bar and advances it towards said right latch;
• next, said right ending ramp slides on said right opening ramp and causes said right latch to slide leftwards until said round bar is able to pass through said right central opening;
• when said right latch slides leftwards it stretches said right extension spring;
• when said right round bar advances more through said right central opening said right notch reaches said right opening ramp and then said right latch springs back rightwards inserting its said right opening ramp into said right notch;
• whereby, anchoring said round bar to said right heel;
• thereby, said right fin also is anchored to said right heel because it is connected to said right round bar;
• said user can detach said right fin from said right heel by pulling leftwards at said right latch which moves out said right opening ramp from said right notch;
• thereby, releasing said right round bar and said right fin from said right heel.

The swimming device of claim number 9, wherein said left member comprising a left polygonal bar;

• said left shaft comprising a left polygonal cavity which is centered along said left axis;
• wherein said left polygonal bar fits into said left polygonal cavity;
• wherein said left polygonal cavity allows said left polygonal bar to move along said left axis but not to rotate around said left axis;
• wherein said left polygonal bar has a left inner square cavity which has a left inner square floor with a left round hole;
• wherein said left inner square cavity contains a left round bar and a left compression spring which is wound around said left round bar;
• wherein said left round bar has a left square head which fits into said left inner square cavity;
• said left round bar has a left round bar lower section which passes through said left round hole and is anchored to said left heel;
• wherein said left compression spring is pre-compressed inside said left inner square cavity between said left square head and said left inner square floor;
• wherein said left compression spring has a bias which tends to push said left member along said left axis towards said left heel;
• whereby, said left fin, which is attached to said left member is also being pushed towards said left heel;
• wherein, left fin is fastened to said left heel;
• said compression spring bias also tends to push said set of left protrusions into said set of left walking recesses when said left fin is rotated into said left walking position;
• thereby, locking said left fin in said left walking position since said set of left protrusions are connected to said left member which cannot rotate around said left axis with respect to said left shoe;
• said compression spring bias also tends to push said set of left protrusions into said set of left swimming recesses when said left fin is rotated into said left swimming position;
• thereby, locking said left fin in said left swimming position since said set of left protrusions are connected to said left member which cannot rotate around said left axis with respect to said left shoe;
• when said user wants to switch said left fin from said left walking position into said left swimming position or vice versa, said user has to unlock said left fin by pulling backwards said left member against bias of said left compression spring, rotate said left fin into a new left position and stop pulling said left member such that said left member locks said left fin in said new left position;
• pulling backwards said left member unlocks said left fin since pulling removes said set of left protrusions either from said set of left walking recesses or from said set of swimming recesses;
• wherein said right member comprising a right polygonal bar;
• said right shaft comprising a right polygonal cavity which is centered along said right axis;
• wherein, said right polygonal bar fits into said right polygonal cavity;
• wherein, said right polygonal cavity allows said right polygonal bar to move along said right axis but not to rotate around said right axis;
• wherein, said right polygonal bar has a right inner square cavity which has a right inner square floor with a right round hole;
• wherein, said right inner square cavity contains a right round bar and a right compression spring wound around said right round bar;
• wherein, said right round bar has a right square head which fits into said right inner square cavity;
• wherein, said right round bar has a right round bar lower section which passes through said right round hole and is anchored to said right heel;
• wherein, said right compression spring is pre-compressed inside said right inner square cavity between said right square head and said right inner square floor;
• wherein said right compression spring has a bias which tends to push said right member along said right axis towards said right heel;
• whereby, said right fin, which is attached to said right member is also being pushed towards said right heel;
• thereby, left fin is fastened to said left heel;
• said compression spring bias also tends to push said set of right protrusions into said set of right walking recesses when said right fin is rotated into said right walking position;
• whereby, locking said right fin in said right walking position since said set of right protrusions are connected to said right member which cannot rotate around said right axis with respect to said right shoe;
• wherein, said compression spring bias also tends to push said set of right protrusions into said set of right swimming recesses when said right fin is rotated into said right swimming position;
• thereby, locking said right fin in said right swimming position since said set of right protrusions are connected to said right member which cannot rotate around said right axis with respect to said right shoe;
• when said user wants to switch said right fin from said right walking position into said right swimming position or vice versa, said user has to unlock said right fin by pulling backwards said right member against bias of said right compression spring, rotate said right fin into a new right position and stop pulling said right member such that said right member locks said right fin in said new right position;
• wherein, pulling backwards said right member unlocks said right fin since pulling removes said set of right protrusions either from said set of right walking recesses or from said set of swimming recesses.

The swimming device of claim number 17, wherein said left latching mechanism comprising:

• a left latch, a left extension spring, a left anchoring screw and said left round bar;
• said left latch is a rectangular metal strip with a left central opening having a left opening ramp on the right hand side of said left central opening, a left spring hole at the left end of said left latch and a left latching hole at the right end of said left latch;
• said left round bar has said left square head and said left round bar lower section with a left notch and a left ending ramp;
• said left latch is housed in a left tunnel in said left heel of said left shoe;
• said left latch is anchored at said left spring hole to the right end of said left extension spring which is also housed at said left tunnel;
• the left end of said left extension spring is anchored to said left heel with said left anchoring screw;
• said left round bar lower section is being anchored to said left heel when said left opening ramp is inserted into said left notch;
• whereby, said left latching mechanism anchors and fastens said left fin to said left heel since said compression spring pushes said left member which is attached to said left fin towards said left heel;
• said user can detach said left fin from said left heel by pulling rightwards at said left latching hole;
• pulling rightwards at said left latching hole moves rightwards said left latch which in turn removes said left opening ramp from said left notch thus releasing said left round bar and said left fin from said left heel;
• when said user wants to attach said left fin to said left heel, said user pushes said left fin towards said left heel, which in turn pushes said left round bar and advances it towards said left latch;
• next, said left ending ramp slides on said left opening ramp and causes said left latch to slide rightwards until said round bar is able to pass through said left central opening;
• when said left latch slides rightwards it stretches said left extension spring;
• when said left round bar advances more through said left central opening said left notch reaches said left opening ramp and then said left latch springs back leftwards inserting its said left opening ramp into said left notch;
• whereby, anchoring said round bar to said left heel;
• thereby, said left fin also is anchored to said left heel because said left fin is connected to said left round bar;
• said user can detach said left fin from said left heel by pulling rightwards at said left latch which removes said left opening ramp from said left notch;
• thereby, releasing said left round bar and said left fin from said left heel;
• wherein said right latching mechanism comprising:
• a right latch, a right extension spring, a right anchoring screw and a right round bar;
• said right latch is a rectangular metal strip with a right central opening having a right opening ramp on the left hand side of said right central opening, a right spring hole at the right end of said right latch and a right latching hole at the left end of said right latch;
• said right round bar has said right square head and said right round bar lower section with a right notch and a right ending ramp;
• said right latch is housed in a right tunnel in said right heel of said right shoe;
• said right latch is anchored at said right spring hole to the left end of said right extension spring which is also housed at said right tunnel;
• the right end of said right extension spring is anchored to said right heel with said right anchoring screw;
• said right round bar lower section is anchored to said right heel when said right opening ramp is inserted into said right notch;
• whereby, said right latching mechanism anchors and fastens said right fin to said right heel since said compression spring pushes said right member which is attached to said right fin towards said right heel;
• said user can detach said right fin from said right shoe by pulling leftwards at said right latching hole;
• pulling leftwards at said right latching hole moves to the left said right latch which in turn removes said right opening ramp from said right notch thus releasing said right round bar and said right fin from said right heel;
• when said user wants to anchor said right fin to said right heel, said user pushes said right fin towards said right heel, which in turn pushes said right round bar and advances it towards said right latch;
• next, said right ending ramp slides on said right opening ramp and causes said right latch to slide leftwards until said round bar is able to pass through said right central opening;
• when said right latch slides leftwards it stretches said right extension spring;
• when said right round bar advances more through said right central opening said right notch reaches said right opening ramp and then said right latch springs back rightwards inserting its said right opening ramp into said right notch;
• whereby, anchoring said round bar to said right heel;
• thereby, said right fin also is anchored to said right heel because it is connected to said right round bar;
• said user can detach said right fin from said right heel by pulling leftwards at said right latch which moves out said right opening ramp from said right notch;
• thereby, releasing said right round bar and said right fin from said right heel.