초록 ▼

A poppet valve structure has a valve plug biased inwardly to close a vent opening (10). A connector member (40, 58) includes a cage (40) extending inwardly from the valve plug and a separately formed bottom plate (58) secured to the cage (40). The plate (58) defines a radially outwardly opening rece

A poppet valve structure has a valve plug biased inwardly to close a vent opening (10). A connector member (40, 58) includes a cage (40) extending inwardly from the valve plug and a separately formed bottom plate (58) secured to the cage (40). The plate (58) defines a radially outwardly opening recess (64) and a first pair of axially spaced apart confronting surfaces. A spring abutment member (66) surrounds the plate (58) and defines a radially inwardly opening recess (74) and a second pair of confronting surfaces. The two pairs of surfaces confront and substantially contact each other. The recesses (64, 74) together define a substantially closed annular chamber. The chamber may be formed by a pair of confronting channels (64, 74) or defined axially between two flanges (61, 67) on the plate (58′) and the abutment member (66′), respectively. A ring of fusible material (76) is cast in situ within the chamber to interconnect the plate (58) and the abutment member ( 66). At elevated temperatures, the fusible material (76) melts to allow the plate (58) and abutment member (66) to slide relative to each other and the plug to move outwardly away from the vent opening. The valve may be incorporated into a fuel tank cap.

대표청구항 ▼

An improved relief valve for a fuel tank, said valve being of a type having a vent opening surrounded by an outwardly directed valve seat and an inwardly directed spring abutment surface, a valve plug positioned outwardly of the valve seat and including a closure surface directed toward the valve se

An improved relief valve for a fuel tank, said valve being of a type having a vent opening surrounded by an outwardly directed valve seat and an inwardly directed spring abutment surface, a valve plug positioned outwardly of the valve seat and including a closure surface directed toward the valve seat, a oonneotor member extending inwardly from the valve plug through the vent opening, said connector member having an inner end spaced from the spring abutment surface, a spring abutment member surrounding the inner end of said connector member, a coil spring having an outer end in contact with the spring abutment surface and an inner end in contact with the spring abutment member, and a ring of fusible material interconnecting the inner end of the connector member and the spring abutment member, wherein the improvement comprises: said connector member defining, at its inner end, a radially outwardly opening recess and a first pair of axially spaced apart confronting surfaces; said spring abutment member defining a radially inwardly opening recess and a second pair of axially spaced apart confronting surfaces; said first pair of confronting surfaces confronting and substantially contacting said second pair of confronting surfaces; said recesses together defining a substantially closed annular chamber; and said ring of fusible material being cast in situ within said chamber.