초록 ▼

In a cap device for a fuel tank, a main portion includes an operation portion, a sealing member and an engaging portion. When the main portion is inserted into an opening portion of the fuel tank and rotated by a predetermined angle, the sealing member is pressed against the opening portion and the

In a cap device for a fuel tank, a main portion includes an operation portion, a sealing member and an engaging portion. When the main portion is inserted into an opening portion of the fuel tank and rotated by a predetermined angle, the sealing member is pressed against the opening portion and the engaging portion engages the opening portion, thereby fixing the cap device to the opening portion. The main portion also includes a shaft portion, a movable member having the engaging portion, and a cam mechanism disposed between the shaft portion and the movable member for allowing the shaft port ion to move separately from the movable member, so that the engaging portion engages the opening portion according to the vertical movement of the shaft portion through the cam mechanism.

대표청구항 ▼

What is claimed is: 1. A cap device for a fuel tank comprising: an operation portion, a shaft portion extending from the operation portion to be inserted into an opening of the fuel tank, a sealing member disposed on the shaft portion for sealing the opening, a movable member disposed over the s

What is claimed is: 1. A cap device for a fuel tank comprising: an operation portion, a shaft portion extending from the operation portion to be inserted into an opening of the fuel tank, a sealing member disposed on the shaft portion for sealing the opening, a movable member disposed over the shaft portion and having an engaging portion for engaging the opening of the fuel tank to fix the cap device to the fuel tank, and a cam mechanism disposed between the shaft portion and the movable member for allowing the shaft portion to move vertically and rotationally relative to the movable member by an actuation of the operation portion so that the engaging portion of the moving member engages with and disengages from the opening of the fuel tank according to a vertical and rotational movement of the shaft portion relative to the movable member through the cam mechanism, wherein the cam mechanism includes a cam groove formed in one of the shaft portion and the movable member and sized to allow the shaft portion to move vertically independent of the movable member, a cam projection formed in the other of the shaft portion and the movable member for fitting in the cam groove, and an urging member disposed between the shaft portion and the movable member for urging the movable member downward. 2. A cap device according to claim 1, wherein said operation portion includes a cover rotatable relative to a flange of the shaft portion, and a connecting mechanism disposed between the flange and the cover for selectively connecting the cover to the shaft portion, said connecting mechanism switching the cover between a non-connecting mode in which the cover rotates separately from the shaft portion and a connecting mode in which the cover rotates with the shaft portion depending on whether the cover is pressed downward with a specific force while the cover rotates in an opening direction. 3. A cap device for a fuel tank comprising: a main body having a flange at an upper side thereof, a sealing member disposed below the flange of the main body for sealing an opening of the fuel tank, an engaging portion disposed under the sealing member for engaging the opening of the fuel tank to fix the cap device to the fuel tank, an operation portion disposed on the flange of the main body, and having a cover rotatable relative to the flange, and a connecting mechanism disposed between the flange and the cover for selectively connecting the cover to the main body, said connecting mechanism switching the cover between a non-connecting mode in which the cover rotates separately from the main body and a connecting mode in which the cover rotates with the main body depending on whether the cover is pressed downward with a specific force while the cover rotates in an opening direction, wherein said connecting mechanism includes a teeth portion having at least one tooth with a first inclined surface facing the downward direction and a second inclined surface facing opposite the opening direction, and a cam mechanism including an introducing groove for introducing a cam projection of a movable member, a stopping vertical rib, a stand-by groove, and a sliding groove in this order, said stopping vertical rib assisting for holding the cam projection in the stand-by groove. 4. A cap device according to claim 3, wherein said connecting mechanism further includes an engaging piece disposed on the flange for engaging the teeth portion, and a spring member disposed between the cover and the flange for urging the teeth portion away from the flange. 5. A cap device according to claim 4, wherein said engaging piece includes a projected portion for engaging a corresponding part of the teeth portion. 6. A cap device according to claim 4, wherein said connecting mechanism further includes a connecting plate attached to the flange portion and having the engaging piece for releasing the projected portion from the teeth portion by allowing the engaging piece to swing when the cover is in the non-connecting mode or the cover rotates in a closing direction with a rotational torque higher than a predetermined value. 7. A cap device according to claim 3, wherein said cover is in the non-connecting mode when the cover is not pushed relative to the flange to abut against the flange. 8. A cap device for a fuel tank comprising: an operation portion, a shaft portion extending from the operation portion to be inserted into an opening of the fuel tank, a sealing member disposed on the shaft portion for sealing the opening, a movable member disposed over the shaft portion and having an engaging portion for engaging the opening of the fuel tank to fix the cap device to the fuel tank, and a cam mechanism disposed between the shaft portion and the movable member for allowing the shaft portion to move vertically and rotationally relative to the movable member by an actuation of the operation portion so that the engaging portion of the moving member engages with and disengages from the opening of the fuel tank according to a vertical and rotational movement of the shaft portion relative to the movable member through the cam mechanism, wherein the cam mechanism includes an introducing groove for introducing a cam projection of the movable member, a stopping vertical rib, a stand-by groove to prevent a rotation of the movable member during at least a portion of an insertion of the shaft portion into an opening of the fuel tank, and a sliding groove in this order, said stopping vertical rib assisting for holding the cam projection in the stand-by groove.