Pneumatic fender and mouth piece metal for pneumatic fender
A pneumatic fender and a mouth piece metal for a pneumatic fender with an open/close valve fixed at a position in which a through hole formed in a dividing wall constituting a receiving chamber, where the valve is closed by closed position fixing members. A safety valve is isolated from a cavity of a fender bladder by a receiving chamber, the safety valve being able to be detached and attached while the pneumatic fender is in use. A confirmation test of a valve opening pressure of the safety valve is performed by opening a receiving chamber open/close valve and raising an internal pressure of a cavity of the receiving chamber to a pressure threshold via a receiving chamber communication passage. The open/close valve is fixed at a position in which the through hole is open by open position fixing member.
1. A pneumatic fender comprising:
a fender bladder including a cylindrical portion and bowl-like hemispherical portions connected to each end of the cylindrical portion;
a mouth piece metal disposed on at least one of the hemispherical portions,
the mouth piece metal including:
a safety valve that, upon an internal pressure of a cavity of the fender bladder reaching a pressure threshold, opens to connect the cavity of the fender bladder to outside air and reduce the internal pressure, and
a communication passage that connects the cavity of the fender bladder and outside air; and
a bladder open/close valve that opens and closes the communication passage; wherein
the mouth piece metal further includes:
a receiving chamber that isolates the safety valve from the cavity of the fender bladder,
a through hole that connects a cavity of the receiving chamber and the cavity of the fender bladder, the through hole being formed on a dividing wall constituting the receiving chamber,
an open/close valve that opens and closes the through hole,
a closed position fixing member that fixes the open/close valve at a position in which the through hole is closed,
an open position fixing member that fixes the open/close valve at a position in which the through hole is open,
a receiving chamber communication passage that connects the cavity of the receiving chamber and outside air, and
a receiving chamber open/close valve that opens and closes the receiving chamber communication passage; and
at least a part of the closed position fixing member and at least a part of the open position fixing member are disposed outside of the receiving chamber at a position to a surface side of the mouth piece metal.
2. The pneumatic fender according to claim 1 , wherein
the open/close valve includes:
an inner flange disposed in the receiving chamber,
an outer flange disposed outside of the receiving chamber at a position to the surface side of the mouth piece metal, and
a shaft including ends to which the inner flange and the outer flange are fixed in an opposing manner;
the open/close valve is slidable in a direction toward or away from the through hole: and
the open/close valve opens and closes the through hole via the inner flange.
3. The pneumatic fender according to claim 2 , wherein
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is closed and the dividing wall approximate to the through hole, and
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is open and the dividing wall.
4. The pneumatic fender according to claim 1 , wherein
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is closed and the dividing wall approximate to the through hole, and
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is open and the dividing wall.
5. A mouth piece metal for a pneumatic fender attachable to a bowl-like hemispherical portion constituting a fender bladder, the mouth piece metal comprising:
a safety valve that, upon an internal pressure of a cavity of the fender bladder reaching a pressure threshold, opens to connect the cavity of the fender bladder to outside air and reduce the internal pressure, and
a communication passage that connects the cavity of the fender bladder and outside air; and
a bladder open/close valve that opens and closes the communication passage; wherein
the mouth piece metal further includes:
a receiving chamber that isolates the safety valve from the cavity of the fender bladder,
a through hole that connects a cavity of the receiving chamber and the cavity of the fender bladder, the through hole being formed on a dividing wall constituting the receiving chamber,
an open/close valve that opens and closes the through hole,
a closed position fixing member that fixes the open/close valve at a position in which the through hole is closed,
an open position fixing member that fixes the open/close valve at a position in which the through hole is open,
a receiving chamber communication passage that connects the cavity of the receiving chamber and outside air, and
a receiving chamber open/close valve that opens and closes the receiving chamber communication passage; and
at least a part of the closed position fixing member and at least a part of the open position fixing member are disposed outside of the receiving chamber at a position to a surface side of the mouth piece metal.
6. The mouth piece metal for a pneumatic fender according to claim 5 , wherein
the open/close valve includes:
an inner flange disposed in the receiving chamber,
an outer flange disposed outside of the receiving chamber at a position to the surface side of the mouth piece metal, and
a shaft including ends to which the inner flange and the outer flange are fixed in an opposing manner;
the open/close valve is slidable in a direction toward or away from the through hole; and
the open/close valve opens and closes the through hole via the inner flange.
7. The mouth piece metal for a pneumatic fender according to claim 6 , wherein
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is closed and the dividing wall approximate to the through hole, and
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through is open and the dividing wall.
8. The mouth piece metal for a pneumatic fender according to claim 5 , wherein
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through hole is closed and the dividing wall approximate to the through hole, and
a seal material is disposed between opposing surfaces of the open/close valve fixed at a position in which the through is open and the dividing wall.