Attitude reconstructing apparatus of air boat

Abstract

It is an object of the invention to realize an attitude reconstructing apparatus of an air boat in which until a ship body in an overturn attitude is set to a rotational angle which is equal to or less than an overturn limit angle and is reconstructed to a normal attitude, a force in a reconstructing direction can be continuously made to act on the ship body and the ship body can be certainly reconstructed to the normal attitude. According to the invention, there is provided an attitude reconstructing apparatus of an air boat in which a propeller for propulsion is attached to an engine mounted in an upward position of a rear portion of a ship body, wherein an expandable floating body is attached to a propeller guard covering the propeller and the apparatus has control means for controlling at least one of an expansion/contraction state and a setting state of the floating body so that a force in the reconstructing direction to make the ship body approach the normal attitude is made to act on the ship body in the overturn attitude.

1 . An attitude reconstructing apparatus of an air boat in which a propeller for propulsion is attached to an engine mounted in an upward position of a rear portion of a ship body, wherein:
 an expandable floating body is mounted to a propeller guard covering the propeller; and   the apparatus has control means for controlling at least one of an expansion/contraction state and a setting state of the floating body so that a force in a reconstructing direction adapted to make the ship body approach a normal attitude is made to act on the ship body in an overturn attitude.   
     
     
         2 . An attitude reconstructing apparatus of the air boat according to  claim 1 , wherein:
 the propeller guard has an outer peripheral member which is curved and projected upwardly in an inverse U-character shape so as to cover a rotational locus of the propeller;   the floating body is constructed by a one-side floating body which is mounted in an upper portion on one side in a ship body width direction of the outer peripheral member and an other-side floating body which is mounted in an upper portion on the other side in the ship body width direction of the outer peripheral member;   the apparatus has an arm extending from a lower portion to the upper portion along the other side in the ship body width direction of the outer peripheral member;   the other-side floating body is attached to an upper edge of the arm, the upper edge is rotated around a lower edge of the arm as a center by an actuator mounted to the lower portion on the other side in the ship body width direction of the outer peripheral member, thereby enabling a setting position of the other-side floating body to be changed;   a pressure source mounted to the ship body is connected to the one-side floating body and the other-side floating body by a one-side communicating passage and an other-side communicating passage, respectively;   a one-side switching valve and an other-side switching valve are provided for the one-side communicating passage and the other-side communicating passage, respectively;   a power source mounted to the ship body is connected to the actuator by a communicating electric path;   a change-over switch is provided for the communicating electric path;   the control means has detection means which can detect a rotational angle of the ship body in the ship body width direction;   on the basis of the rotational angle of the ship body detected by the detection means,   when the ship body is rotated from the normal attitude in the overturn direction at an angle exceeding an overturn limit angle, the one-side switching valve is switched so as to supply a pressure gas to the one-side floating body from the pressure source and to expand the one-side floating body;   when the ship body in the overturn attitude is rotated in the reconstructing direction by the expansion of the one-side floating body and the ship body is reconstructed to the rotational angle at which the one-side floating body has reached a surface of water, the other-side switching valve is switched so as to supply the pressure gas to the other-side floating body from the pressure source and to expand the other-side floating body; and   when the ship body is further rotated by the expansion of the other-side floating body and the ship body is reconstructed to the rotational angle at which the other-side floating body has reached the surface of the water, the change-over switch is switched so as to supply an electric power to the actuator from the power source and to rotate the arm in such a direction as to be away from the outer peripheral member.   
     
     
         3 . An attitude reconstructing apparatus of the air boat according to  claim 2 , wherein:
 when the ship body is reconstructed to the normal attitude, the control means switches the other-side switching valve so as to exhaust the pressure gas from the other-side floating body and to contract the other-side floating body.   
     
     
         4 . An attitude reconstructing apparatus of the air boat according to  claim 1 , wherein:
 the propeller guard has an outer peripheral member which is curved and projected upwardly in an inverse U-character shape so as to cover a rotational locus of the propeller;   the floating body is constructed by a one-side floating body which is mounted in an upper portion on one side in a ship body width direction of the outer peripheral member and an other-side floating body which is mounted so as to have a length extending from a lower portion on the other side in the ship body width direction of the outer peripheral member to an upper portion;   a pressure source mounted to the ship body is connected to the one-side floating body and the other-side floating body by a one-side communicating passage and an other-side communicating passage, respectively;   a one-side switching valve and an other-side switching valve are provided for the one-side communicating passage and the other-side communicating passage, respectively;   the control means has detection means which can detect a rotational angle of the ship body in the ship body width direction;   on the basis of the rotational angle of the ship body detected by the detection means,   when the ship body is rotated from the normal attitude in the overturn direction at an angle exceeding an overturn limit angle, the one-side switching valve is switched so as to supply a pressure gas to the one-side floating body from the pressure source and to expand the one-side floating body; and   when the ship body in the overturn attitude is rotated in the reconstructing direction by the expansion of the one-side floating body and the ship body is reconstructed to the rotational angle at which the one-side floating body has reached a surface of water, the other-side switching valve is switched so as to supply the pressure gas from the pressure source to the other-side floating body having the length extending from the lower portion of the outer peripheral member to the upper portion and to expand the other-side floating body.   
     
     
         5 . An attitude reconstructing apparatus of the air boat according to  claim 1 , wherein
 the propeller guard has an outer peripheral member which is curved and projected upwardly in an inverse U-character shape so as to cover a rotational locus of the propeller;   the floating body is constructed by a one-side floating body which is mounted in an upper portion on one side in a ship body width direction of the outer peripheral member and a plurality of other-side floating bodies which are sequentially arranged and mounted from an upper portion on the other side in the ship body width direction of the outer peripheral member to a lower portion;   a pressure source mounted to the ship body is connected to the one-side floating body and the plurality of other-side floating bodies by a one-side communicating passage and a plurality of other-side communicating passages, respectively;   a one-side switching valve and a plurality of other-side switching valves are provided for the one-side communicating passage and the plurality of other-side communicating passages, respectively;   the control means has detection means which can detect a rotational angle of the ship body in the ship body width direction;   on the basis of the rotational angle of the ship body detected by the detection means,   when the ship body is rotated from the normal attitude in the overturn direction at an angle exceeding an overturn limit angle, the one-side switching valve is switched so as to supply a pressure gas to the one-side floating body from the pressure source and to expand the one-side floating body; and   when the ship body in the overturn attitude is rotated in the reconstructing direction by the expansion of the one-side floating body and the ship body is reconstructed to the rotational angle at which the one-side floating body has reached a surface of water, the other-side switching valve is switched so as to supply the pressure gas to the plurality of other-side floating bodies from the pressure source and to sequentially expand the plurality of other-side floating bodies from the upper portion of the outer peripheral member to the lower portion.   
     
     
         6 . An attitude reconstructing apparatus of the air boat according to  claim 1 , wherein
 the propeller guard has an outer peripheral member which is curved and projected upwardly in an inverse U-character shape so as to cover a rotational locus of the propeller;   the floating body is constructed by a moving floating body which can change a setting position of the outer peripheral member;   a rail extending from an upper portion on one side in a ship body width direction of the outer peripheral member through an upper portion on the other side in the ship body width direction to a lower portion is provided;   a moving member to which the moving floating body has been attached is moved along the rail by an actuator, thereby enabling a setting position of the moving floating body to be changed from the upper portion on one side in a ship body width direction of the outer peripheral member through the upper portion on the other side in the ship body width direction to the lower portion;   a pressure source mounted to the ship body is connected to the moving floating body by a communicating passage;   a switching valve is provided for the communicating passage;   a power source mounted to the ship body is connected to the actuator by a communicating electric path;   a change-over switch is provided for the communicating electric path;   the control means has detection means which can detect a rotational angle of the ship body in the ship body width direction;   on the basis of the rotational angle of the ship body detected by the detection means,   when the ship body is rotated from the normal attitude in the overturn direction at an angle exceeding an overturn limit angle, the switching valve is switched so as to supply a pressure gas to the moving floating body from the pressure source and to expand the moving floating body; and   when the ship body in the overturn attitude is rotated in the reconstructing direction by the expansion of the moving floating body and the ship body is reconstructed to the rotational angle at which the moving floating body has reached a surface of water, the change-over switch is switched so as to supply an electric power to the actuator from the power source and to move the moving member to which the moving floating body has been attached along the rail from the upper portion on one side in the ship body width direction of the outer peripheral member through the upper portion on the other side in the ship body width direction to the lower portion.