Radiator cap

A radiator cap adapted to be mounted to a radiator opening and having an axis, said radiator cap comprising:

• a top cover unit including
• a cover body that is adapted to rotatably cover the radiator opening,
• a stem that extends downwardly from said cover body along the axis,
• two positioning members that are disposed respectively at opposite sides of the axis, that protrude inwardly from a periphery of said cover body toward the axis, and that are adapted to be fastened to the radiator opening, and
• a washer that is disposed in said cover body and that surrounds said stem;
• an intermediate seat unit disposed under and connected to said top cover unit, and including
• a connecting tube that is coupled to said stem and that extends along the axis, and
• a connecting seat that is connected to a lower end of said connecting tube, that surrounds the axis, and that has a plurality of guiding recesses equiangularly spaced apart from each other with respect to the axis;
• an output valve unit connected to a lower part of said intermediate seat unit, and including
• a valve seat that is connected to a lower part of said connecting seat and that is movable along the axis relative to said connecting seat, said valve seat and said connecting seat cooperatively defining an inner space, said valve seat having
• a plurality of hook portions that are respectively engaged with and movable along said guiding recesses, and
• a valve hole that is formed in a lower portion of said valve seat and that is in fluid communication with said inner space,
• a valve disc that is disposed under and connected to said valve seat, and
• a first spring that is disposed within said inner space for resiliently biasing said valve seat away from said top cover unit;
• and
• an input valve unit connected to said output valve unit, movable along the axis relative to said output valve unit, and including
• a pin rod that extends movably into said inner space via said valve hole, and
• a second spring that is mounted between said valve seat and a top portion of said pin rod, and that is disposed for resiliently biasing a bottom portion of said pin rod to thereby abut against said valve disc so as to close said valve hole;
• wherein said cover body, said stem, and said positioning members of said top cover unit are integrally made of a plastic material;
• wherein said connecting seat and said connecting tube of said intermediate seat unit are integrally made of a plastic material;
• wherein said valve seat of said output valve unit is integrally made of a plastic material;
• wherein said pin rod of said input valve unit is integrally made of a plastic material;
• wherein said connecting seat further has
• an upper ring portion that extends outwardly from said connecting tube,
• a lower ring portion that is spaced apart from and disposed under said upper ring portion, and
• a surrounding wall portion that interconnects said upper ring portion and said lower ring portion and that surrounds the axis;
• wherein each of said guiding recesses is indented from an inner surface of said surrounding wall portion, and extends upwardly through said upper ring portion and extends outwardly through said surrounding wall portion;
• wherein said valve seat of said output valve unit further has
• a bottom wall portion that is formed with said valve hole, and
• an insertion wall portion that surrounds the axis, that extends upwardly from said bottom wall portion, and that is inserted into said lower ring portion of said connecting seat;
• and
• wherein said hook portions protrude outwardly from an outer periphery of said insertion wall portion.