초록 ▼

Fuel shut-off device for use in a diesel fuel tank to discontinue fuel flow to a fuel pump comprises a valve seat forming a fuel flow opening for fuel to flow from the fuel tank to the fuel pump, a fuel control valve cooperably disposed relative to the valve seat to control fuel flow from the fuel t

Fuel shut-off device for use in a diesel fuel tank to discontinue fuel flow to a fuel pump comprises a valve seat forming a fuel flow opening for fuel to flow from the fuel tank to the fuel pump, a fuel control valve cooperably disposed relative to the valve seat to control fuel flow from the fuel tank to the fuel pump, and a spring biasing the fuel inlet valve to a closed position against the valve seat. A diaphragm is provided having a first valve-actuating side for moving the fuel inlet valve relative to the valve seat against bias of the spring and a second side. The second side is communicated to a control chamber having an inlet orifice that is communicated to the fuel tank and an outlet orifice that is communicated to said fuel pump. An inlet orifice valve is disposed in the fuel tank and is actuated to open the inlet orifice to the fuel tank when the fuel level is above a predetermined low level to cause the diaphragm to move toward the fuel inlet valve to move it to an open position relative to the valve seat against bias of the spring and actuated to close the inlet orifice to the fuel tank when the fuel level is at the predetermined low level to cause the diaphragm to move away from the fuel inlet valve to allow the spring to move the fuel inlet valve to the closed position to provide insufficient fuel flow to the fuel pump to maintain engine operation, thereby preventing air from being ingested into the fuel pump.

대표청구항 ▼

Fuel shut-off device for use in a diesel fuel tank to discontinue fuel flow to a fuel pump comprises a valve seat forming a fuel flow opening for fuel to flow from the fuel tank to the fuel pump, a fuel control valve cooperably disposed relative to the valve seat to control fuel flow from the fuel t

Fuel shut-off device for use in a diesel fuel tank to discontinue fuel flow to a fuel pump comprises a valve seat forming a fuel flow opening for fuel to flow from the fuel tank to the fuel pump, a fuel control valve cooperably disposed relative to the valve seat to control fuel flow from the fuel tank to the fuel pump, and a spring biasing the fuel inlet valve to a closed position against the valve seat. A diaphragm is provided having a first valve-actuating side for moving the fuel inlet valve relative to the valve seat against bias of the spring and a second side. The second side is communicated to a control chamber having an inlet orifice that is communicated to the fuel tank and an outlet orifice that is communicated to said fuel pump. An inlet orifice valve is disposed in the fuel tank and is actuated to open the inlet orifice to the fuel tank when the fuel level is above a predetermined low level to cause the diaphragm to move toward the fuel inlet valve to move it to an open position relative to the valve seat against bias of the spring and actuated to close the inlet orifice to the fuel tank when the fuel level is at the predetermined low level to cause the diaphragm to move away from the fuel inlet valve to allow the spring to move the fuel inlet valve to the closed position to provide insufficient fuel flow to the fuel pump to maintain engine operation, thereby preventing air from being ingested into the fuel pump. er boom member being movable with said intermediate boom member as said intermediate boom member is retracted and extended; a first concrete conduit, having inner and outer ends, positioned at said first side of said inner boom member; said inner end of said first concrete conduit being positioned at said inner end of said inner boom member; said outer end of said first concrete conduit being positioned at said outer end of said inner boom member; said inner end of said first concrete conduit being in communication with a source of concrete under pressure; an elongated, flexible concrete hose having first and second ends; said first end of said flexible concrete hose being operatively connected to said outer end of said first concrete conduit; a first elongated support, having inner and outer ends, mounted on said inner boom member at said first side thereof; a second elongated support, having inner and outer ends, mounted on said inner boom member at said second side thereof; a third elongated support, having inner and outer ends, movably mounted on said second elongated support; said third elongated support being movable between retracted and extended positions with respect to said second elongated support; said outer end of said third elongated support being operatively secured to said outer end of said intermediate boom member so that said third elongated support moves from its said retracted position to its said extended position as said intermediate boom member is moved from its said retracted position to its said extended position; a second concrete conduit, having inner and outer ends; said inner end of said second concrete conduit being in fluid communication with said second end of said flexible concrete hose; said second concrete conduit being secured to said outer end of said outer boom member for movement therewith; said second concrete conduit being positioned on said third elongated support when said outer boom member is in its said retracted position; said second concrete conduit extending from said outer end of said third elongated support when said outer boom member is in its said extended position; said flexible concrete hose being positioned on said first elongated support and at least partially upon said second elongated support when said intermediate and outer boom members are in their said retracted positions; and a concrete discharge conduit operatively secured to said outer end of said second concrete conduit. 2. The combination of claim 1 wherein said concrete discharge conduit comprises a rigid jib boom member, having inner and outer ends, pivotally secured to the outer end of said outer boom member. 3. The combination of claim 2 wherein said rigid jib boom member includes a self-aligning mechanism which normally maintains said rigid jib boom member in an aligned relationship with respect to said inner boom member. 4. The combination of claim 2 wherein a flexible concrete discharge hose is secured to said outer end of said rigid jib boom member. 5. The combination of claim 1 wherein said flexible concrete hose is generally U-shaped when the intermediate boom member and said outer boom member are in their said retracted positions. 6. The combination of claim 1 wherein said first elongated support is generally L-shaped in cross section. 7. The combination of claim 1 wherein said second elongated support is generally U-shaped in cross section. 8. The combination of claim 1 wherein said third elongated support is generally U-shaped in cross section. 9. The combination of claim 1 wherein said first concrete conduit comprises a rigid pipe. 10. The combination of claim 1 wherein said third concrete conduit comprises a rigid pipe. 11. The combination of claim 1 wherein said concrete discharge conduit comprises a rigid jib boom member pivotally and rotatably secured to the outer end of said outer boom member. 12. The combination of claim 11 wherein the pivotal axis and the rotational axis