US 12,404,788 B2
Oil tank cap
Po-Hua Wu, Tainan (TW)
Assigned to COPLUS INC., Tainan (TW)
Filed by COPLUS INC., Tainan (TW)
Filed on Nov. 7, 2023, as Appl. No. 18/503,635.
Claims priority of application No. 111212217 (TW), filed on Nov. 8, 2022.
Prior Publication US 2024/0150091 A1, May 9, 2024
Int. Cl. F01M 11/04 (2006.01); B65D 41/02 (2006.01); B65D 51/16 (2006.01); B65D 53/02 (2006.01)
CPC F01M 11/04 (2013.01) [B65D 41/02 (2013.01); B65D 51/1644 (2013.01); B65D 53/02 (2013.01); B65D 2205/02 (2013.01); B65D 2251/205 (2013.01); F01M 2011/0491 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An oil tank cap adapted to be removably engaged with an oil tank, the oil tank having an oil storing space, and an oil inlet that spatially communicates with the oil storing space, said oil tank cap comprising:
a cap body that includes
an outer casing, and
a cap base being plastic and one-piece, cooperating with said outer casing to define an air accommodation space, and having
an annular seat portion that is adapted to be disposed outside the oil inlet, and that has an inner periphery, an outer periphery opposite to said inner periphery and connected to said outer casing, and at least one exhaust hole interconnecting said air accommodation space and an external environment,
a tube portion that extends from said inner periphery of said annular seat portion, and that is adapted to extend into the oil inlet, and
a separation portion that is connected to and disposed inside said tube portion, said air accommodation space being between said separation portion and said outer casing, said separation portion having
an accommodating slot that is formed in a middle of said separation portion, and that is isolated from said air accommodation space, and
at least one ventilation hole that is disposed beside and spaced apart from said accommodating slot, and that is adapted for interconnecting said air accommodation space and the oil storing space;
a spring strip that extends through said accommodating slot, and that is adapted to be disposed in the oil storing space and adjacent to the oil inlet;
an air seal that is disposed in said tube portion of said cap body, that abuts against said separation portion, and that encircles said at least one ventilation hole; and
an air valve that is inserted into said tube portion, that is connected airtightly to said air seal, and that is operable to open or close for balancing pressure of the oil storing space and pressure of the external environment.