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 wide section which is connected to said left fin base;
• wherein said right fin comprising a right fin base and a right fin wide section which is connected to said right fin base;
• an inner product angle between two vectors is defined here as having values which are in the range of 0 to 180 degrees;
• wherein said left fin position is measured by its left slant angle and by its left tilt angle;
• wherein said left tilt angle is defined as the inner product angle between said left shoe's vertical axis vector and said left fin's axis of symmetry vector;
• wherein said left shoe's said vertical axis vector is pointing upwards and is perpendicular to the plane of the sole of said left shoe;
• wherein said left fin's said axis of symmetry vector coincides with said left fin's axis of symmetry and is pointing from said left fin's base towards said left fin's wide section;
• wherein said left slant angle is defined as said inner product angle between said left shoe's said vertical axis vector and said left fin's axis of rotation vector which coincides with said left fin's said axis of rotation and is pointing outwards from said left shoe;
• 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 fin position is measured by its right slant angle and by its right tilt angle;
• wherein said right tilt angle is defined as said inner product angle between said right shoe's vertical axis vector and said right fin's axis of symmetry vector;
• wherein said right shoe's said vertical axis vector is pointing upwards and is perpendicular to the plane of the sole of said right shoe;
• wherein said right fin's said axis of symmetry vector coincides with said right fin's axis of symmetry and is pointing from said right fin's base towards said right fin's wide section;
• wherein said right slant angle is defined as said inner product angle between said right shoe's said vertical axis vector and said right fin's said axis of rotation vector which coincides with said right fin's said axis of rotation and is pointing outwards from said right shoe;
• wherein said right fin is in said right walking position when said right fin has a predetermined said right tilt angle which is in 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 6, wherein said left positioning mechanism can lock said left fin at said left walking position by placing left positioning pins into left walking position recesses;

• also said left positioning mechanism can lock said left fin at said left swimming position by placing said left positioning pins into left swimming position recesses;
• said user can switch position of said left fin from said left fin walking position to said left fin swimming position by temporarily removing said left positioning pins from said left walking position recesses, rotating said left fin to said left fin swimming position and placing said left positioning pins into said left swimming position recesses;
• said user can switch position of said left fin from said left fin swimming position to said left fin walking position by temporarily removing said left positioning pins from said left swimming position recesses, rotating said left fin to said left fin walking position and placing said left positioning pins into said left walking position recesses;
• in addition, said right positioning mechanism can lock said right fin at said right walking position by placing right positioning pins into right walking position recesses;
• also said right positioning mechanism can lock said right fin at said right swimming position by placing said right positioning pins into right swimming position recesses;
• said user can switch position of said right fin from said right fin walking position to said right fin swimming position by temporarily removing said right positioning pins from said right walking position recesses, rotating said right fin to said right fin swimming position and placing said right positioning pins into said right swimming position recesses;
• said user can switch position of said right fin from said right fin swimming position to said right fin walking position by temporarily removing said right positioning pins from said right swimming position recesses, rotating said right fin to said right fin walking position and placing said right positioning pins into said right walking position recesses.

The swimming device of claim number 1, wherein said left shoe comprising a left shoe bearing connected to said rear side of said left shoe and centered at said left axis of rotation;

• wherein, said left fin comprising a left fin shaft;
• wherein said left shoe bearing is mounted on said left fin shaft which is connected to said left fin base and centered at said left axis of rotation;
• whereby said left fin can be rotated with respect to said left shoe around said left axis of rotation;
• wherein said right shoe comprising a right shoe bearing connected to said rear side of said right shoe and centered at said right axis of rotation;
• wherein, said right fin comprising a right fin shaft;
• wherein right shoe bearing is mounted on said right fin shaft which is connected to said right fin base and centered at said right axis of rotation;
• whereby said right fin can be rotated with respect to said right shoe around said right axis of rotation.

The swimming device of claim number 1, wherein said left fin comprising a left wide section and said left fin base;

• wherein said left wide section is made of resilient material;
• wherein said left fin base is made of rigid material;
• wherein said right fin comprising a right wide section and said right fin base;
• wherein said right wide section is made of resilient material;
• wherein said right fin base is made of rigid material.

The swimming device of claim number 7, wherein said left positioning pins are installed on a left member comprising a left polygonal bar;

• said left polygonal bar is fitted into a left polygonal cavity which is centered at said left shaft;
• said left polygonal cavity allows said left polygonal bar to move along said left axis of rotation but not to rotate around said left axis of rotation which is centered at said left shaft;
• said left polygonal bar has a left inner cavity which contains a left compression spring which pushes said left member along said left axis of rotation towards said left fin;
• said left fin has said left bearing which is mounted on said left shaft;
• said left fin can rotate around said left shaft to left walking position and also to left swimming position;
• said left fin has said left walking position recesses and said left swimming position recesses;
• said left positioning pins can be placed in said left walking position recesses when said left positioning pins are aligned with said left walking position recesses;
• when said left positioning pins are placed in said left walking position recesses, said left fin is locked in said left walking position because said left positioning pins are attached to said left member which cannot rotate around left axis of rotation;
• said left positioning pins are aligned with said left walking position recesses when said left fin is rotated into said left walking position;
• said left member is pushed by said left compression spring and is enabled to push said left positioning pins into said left walking position recesses when said left fin is rotated into said left walking position;
• whereby, when said left fin is rotated into said left walking position, said left member is enabled to lock said left fin in said left walking position;
• unlocking said left fin requires said user to pull said member against said its left compression spring bias thus removing said left positioning pins from said left walking position recesses;
• said left positioning pins can be placed in said left swimming position recesses when said left positioning pins are aligned with said left swimming position recesses;
• when said left positioning pins are placed in said left swimming position recesses, said left fin is locked in left swimming position because said left positioning pins are attached to said left member which cannot rotate around said left axis of rotation;
• said left positioning pins are aligned with said left swimming position recesses when said left fin is rotated into said left swimming position;
• said left member is pushed by said left compression spring and is enabled to push said left positioning pins into said left swimming position recesses when said left fin is rotated into said left swimming position;
• whereby, when said left fin is rotated into said left swimming position, said left member is enabled to lock said left fin in said left swimming position;
• unlocking said left fin requires said user to pull said member against said its left compression spring bias thus removing said left positioning pins from said left swimming position recesses;
• wherein said right positioning pins are installed on a right member which has a right polygonal bar;
• said right polygonal bar is fitted into a right polygonal cavity which is centered at said right shaft;
• said right polygonal cavity allows said right polygonal bar to move along said right axis of rotation but not to rotate around said right axis of rotation which is centered at said right shaft;
• said polygonal bar has a right inner cavity which contains a right compression spring which pushes said right member along said right axis of rotation towards said right fin;
• said right fin has said right bearing which is mounted on said right shaft;
• said right fin can rotate around said right shaft to right walking position and to right swimming position;
• said right fin has said right walking position recesses and said right swimming position recesses;
• said right positioning pins can be placed in said right walking position recesses when said right positioning pins are aligned with said right walking position recesses;
• when said right positioning pins are placed in said right walking position recesses, said right fin is locked in said right walking position because said right positioning pins are attached to said right member which cannot rotate around said right axis of rotation;
• said right positioning pins are aligned with said right walking position recesses when said right fin is rotated into said right walking position;
• said right member is pushed by said right compression spring and is enabled to push said right positioning pins into said right walking position recesses when said right fin is rotated into said right walking position;
• whereby, when said right fin is rotated into said right walking position, said right member is enabled to lock said right fin in said right walking position;
• unlocking said right fin requires said user to pull said member against said its right compression spring bias thus removing said right positioning pins from said right walking position recesses;
• said right positioning pins can be placed in said right swimming position recesses when said right positioning pins are aligned with said right swimming position recesses;
• when said right positioning pins are placed in said right swimming position recesses, said right fin is locked in said right swimming position because said right positioning pins are attached to said right member which cannot rotate around said right axis of rotation;
• said right positioning pins are aligned with said right swimming position recesses when said right fin is rotated into said right swimming position;
• said right member is pushed by said right compression spring and is enabled to push said right positioning pins into said right swimming position recesses when said right fin is rotated into said right swimming position;
• whereby, when said right fin is rotated into said right swimming position, said right member is enabled to lock said right fin in said right swimming position;
• unlocking said right fin requires said user to pull said member against said its right compression spring bias thus removing said right positioning pins from said right swimming position recesses.

The swimming device of claim number 7, wherein said left positioning mechanism includes said left member with attached two said left positioning pins which are positioned at radial configuration on a left bearing circle centered at said left axis of rotation;

• said left bearing circle has a radius which is equal to the radius of said left bearing;
• said left positioning pins have an angular spacing of:
• 180−2·angle2 degrees measured counterclockwise;
• wherein said angle2 is equal to said left tilt angle which is equal also to said right tilt angle;
• said left walking position recesses plus said left swimming position recesses include three left recesses which are positioned at radial configuration on said left bearing circle;
• wherein left recess number 1 is positioned at upper side crossing of said left fin axis of symmetry with said left bearing circle which is defined here as left zero degrees;
• left recess number 2 is positioned at:
• 180−2·angle2 degrees measured in counterclockwise direction on said left bearing circle;
• left recess number 3 is positioned at:
• 180+2·angle2 degrees measured in counterclockwise direction on said left bearing circle;
• said left walking position recesses include:
• said left recess number 1 and said left recess number 2;
• said left swimming position recesses include said left recess number 3 and said left recess number 1;
• said right positioning mechanism includes said right member with attached two said right positioning pins which are positioned at radial configuration on a right bearing circle centered at said right axis of rotation;
• said right bearing circle has a radius which is equal to the radius of said right bearing;
• said right positioning pins have an angular spacing of:
• 180−2·angle2 degrees measured clockwise;
• wherein said angle2 is equal to said right tilt angle;
• said right walking position recesses plus said right swimming position recesses include three right recesses which are positioned at radial configuration on said right bearing circle;
• wherein right recess number 1 is positioned at upper side crossing of said right fin axis of symmetry with said right bearing circle which is defined here as right zero degrees;
• right recess number 2 is positioned at:
• 180−2·angle2 degrees measured in clockwise direction on said right bearing circle;
• right recess number 3 is positioned at:
• 180+2·angle2 degrees measured in clockwise direction on said right bearing circle;
• said right walking position recesses include:
• said right recess number 1 and said right recess number 2;
• said right swimming position recesses include said right recess number 3 and said right recess number 1.

The swimming device of claim number 9, wherein said left latching mechanism which is identical to said right latching mechanism comprising:

• a left latch, a left extension spring, a left anchoring screw and a left round bar;
• said left latch is a rectangular metal strip with a left central opening having a left opening ramp on one side of said central opening and two left holes at said left latch's ends;
• said left round bar has a left square head and a left elongated round bar 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 and is anchored at one end to said left extension spring which is also housed at said left tunnel;
• second end of said left extension spring is anchored to said left heel with said left anchoring screw;
• said left round bar is housed in a left round hole in said left heel;
• said left round hole is perpendicular to said left tunnel;
• when said user wants to latch said left fin to said left shoe, said user 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 backwards until said round bar is able to pass through said left central opening;
• when said left latch slides back 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 inserting its said left opening ramp into said left notch;
• whereby, latching said round bar to said left shoe;
• thereby, said left fin also is latched to said left shoe because it is connected to said left round bar;
• said user can detach said left fin from said left shoe by pulling at said left latch which moves out said left opening ramp from said left notch;
• thereby, releasing said left round bar and said left fin;
• wherein said right latching mechanism which is identical to said left 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 one side of said central opening and two right holes at said right latch's ends;
• said right round bar has a right square head and a right elongated round bar 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 and is anchored at one end to said right extension spring which is also housed at said right tunnel;
• second end of said right extension spring is anchored to said right heel with said right anchoring screw;
• said right round bar is housed in a right round hole in said right heel;
• said right round hole is perpendicular to said right tunnel;
• when said user wants to latch said right fin to said right shoe, said user 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 backwards until said round bar is able to pass through said right central opening;
• when said right latch slides back 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 inserting its said right opening ramp into said right notch;
• whereby, latching said round bar to said right shoe;
• thereby, said right fin also is latched to said right shoe because it is connected to said right round bar;
• said user can detach said right fin from said right shoe by pulling 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.

The swimming device of claim number 1, wherein said left axis of rotation is slanted which means having said left slant angle in the range of 90 to 180 degrees with respect to said left shoe's said vertical axis vector;

• wherein said left shoe's said vertical axis vector is pointing upwards and is perpendicular to said plane of the sole of said left shoe;
• wherein said left slant angle is defined as said inner product angle between said left shoe's said vertical axis vector and said left fin's axis of rotation vector which coincides with said left fin's said axis of rotation and is pointing outwards from said left shoe;
• wherein said right axis of rotation is slanted which means having said right slant angle in the range of 90 to 180 degrees with respect to said right shoe's said vertical axis vector;
• wherein said right shoe's said vertical axis vector is pointing upwards and is perpendicular to said plane of the sole of said right shoe;
• wherein said right slant angle is defined as said inner product angle between said right shoe's said vertical axis vector and said right fin's axis of rotation vector which coincides with said right fin's said axis of rotation and is pointing outwards from said right shoe;