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A leak proof lid for a beverage container has a rocker arm which may be moved between open and closed positions by one hand. The lid is provided with drinking and venting apertures and respective basins within the lid. The rocker arm includes venting and drinking seals for sealing the respective ape

A leak proof lid for a beverage container has a rocker arm which may be moved between open and closed positions by one hand. The lid is provided with drinking and venting apertures and respective basins within the lid. The rocker arm includes venting and drinking seals for sealing the respective aperture when the rocker arm is in the closed position. The rocker arm is easily removable from an upper side of the lid to facilitate cleaning the venting and drinking aperture and seals on the rocker arm.

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1. A selectively openable drinking vessel lid adapted for receipt on the drinking vessel in an operating orientation and for operation with one hand, comprising:a substantially circular main body having an upper side, a lower side and wherein the main body defines a depressed drinking basin on the u

1. A selectively openable drinking vessel lid adapted for receipt on the drinking vessel in an operating orientation and for operation with one hand, comprising:a substantially circular main body having an upper side, a lower side and wherein the main body defines a depressed drinking basin on the upper side and diametrically opposed drinking and venting bores having substantially smooth sidewalls;an elongated rocker arm, vertically removable and pivotally connected to the upper side of the main body and having drinking and venting ends, the rocker arm being pivotable with respect to the main body between an open and a closed position;a drinking seal connected to the rocker arm adjacent to the drinking end, the drinking seal having a resilient, laterally extending, circumferential flange having a perimeter larger than a perimeter of the drinking bore for forming a seal with the side wall thereof; and,a venting seal connected to the rocker arm adjacent to the venting end, the venting seal having a resilient, laterally extending circumferential flange having a perimeter larger than a perimeter of the venting bore for forming a seal with the side wall thereof, so that the drinking and venting seal flanges are above and below their respective bores when the rocker arm is in the open position and so that the drinking and venting seal flanges are within the bores when the rocker arm is in the closed position. 2. The selectively openable lid of claim 1, including means for connecting the main body to a drinking vessel, wherein the rocker arm is substantially curved so that the drinking seal resides in a plane substantially lower than does the venting seal such that the drinking end of the rocker arm when in the open position does not mechanically interfere with a user's nose when the lid is used in connection with the drinking vessel. 3. The selectively openable lid of claim 1, wherein the elongated rocker arm is vertically removable from the main body by means of a pair of centrally positioned, flexible arms having detent pips at ends thereof and wherein the main body has centrally disposed detents external to the drinking basin for receipt of the pips. 4. The selectively openable lid of claim 1, wherein the main body has a raised, substantially planar surface adjacent to and substantially surrounding the venting bore, and wherein the rocker arm has a substantially planar upper surface adjacent to the venting end so that outside of the drinking basin, the main body and the venting end of the rocker arm present a substantially flat, coextensive profile without protuberances when the rocker arm is in the closed position. 5. The selectively openable lid of claim 1, wherein the lid has means for maintaining the rocker arm in the open position. 6. The selectively openable lid of claim 5, wherein the flanges and the bores are circular. 7. The selectively openable lid of claim 6, wherein the flanges are sufficiently resilient to deform into conic sections when the flanges are received in their respective bores. 8. A selectively openable drinking vessel lid adapted for receipt on the drinking vessel in an operating orientation and for operation with one hand, comprising:a main body having an upper side, a lower side and opposed drinking and venting bores having substantially smooth sidewalls;a removable, elongated rocker arm pivotally connected to the upper side of the main body between the drinking and venting bores and having drinking and venting ends, the rocker arm being pivotable with respect to the main body between an open and a closed position;a drinking seal connected to the rocker arm adjacent to the drinking end, the drinking seal having a resilient, laterally extending, circumferential flange having a perimeter larger than a perimeter of the drinking bore for forming a friction fit seal with the side wall thereof; and,a venting seal connected to the rocker arm adjacent to the venting end, the venting seal having a resilient, la terally extending circumferential flange having a perimeter larger than a perimeter of the venting bore for forming a friction fit seal with the side wall thereof, whereby the flanges are out of registration with their respective bores when the rocker arm is in the open position and so that the flanges are received within the bores when the rocker arm is in the closed position. 9. The selectively openable lid of claim 8, including means for fluidly connecting the main body to a drinking vessel, wherein the rocker arm is substantially curved so that the drinking seal resides in a plane substantially lower than does the venting seal such that the drinking end of the rocker arm when in the open position does not mechanically interfere with a user's nose when the lid is used in connection with the drinking vessel. 10. The selectively openable lid of claim 8, wherein the lid has removal means for vertically removing the rocker arm from the main body to facilitate cleaning the bores and the seals. 11. The selectively openable lid of claim 8, wherein the removal means includes a pair of centrally positioned, flexible arms on the rocker arm, each flexible arm having an outwardly directed detent pip at an end thereof and wherein the main body has centrally disposed detents for receipt of the pips. 12. The selectively openable lid of claim 8, wherein the main body has a raised, substantially planar surface adjacent to and substantially surrounding the venting bore, and wherein the rocker arm has a substantially planar upper surface adjacent to the venting end so that the lid in the vicinity of the venting end presents a substantially flat profile without protuberances when the rocker arm is in the closed position. 13. The selectively openable lid of claim 8, wherein the flanges are connected to the rocker arm by resilient stems. 14. The selectively openable lid of claim 8, wherein the flanges and the bores are circular. 15. The selectively openable lid of claim 14, wherein the flanges are sufficiently resilient to deform into conic sections when the flanges are received in their respective bores. 16. The selectively openable lid of claim 8, wherein the main body is substantially circular and the bores are diametrically opposed. 17. The selectively openable lid of claim 8, wherein the main body defines a depressed drinking region, and wherein the drinking bore is located within the drinking region and the venting bore is located outside of the drinking region. 18. A selectively openable drinking vessel lid adapted for receipt on a drinking vessel, in an operating orientation operation with one hand, comprising:a main body having an upper side, a lower side and opposed drinking and venting bores having substantially smooth sidewalls;a removable, elongated rocker arm pivotally connected to the upper side of the main body and having drinking and venting ends, the rocker arm being pivotable with respect to the main body between an open and a closed position;a drinking seal having a resilient, laterally extending, circumferential drinking seal flange for forming a friction fit seal with the drinking bore side wall, the drinking seal flange being connected to the rocker arm so as to be located above the drinking bore when the rocker arm is in the open position; and,a venting seal having a resilient, laterally extending, circumferential venting seal flange for forming a friction fit seal with the venting bore side wall, the venting seal flange being connected to the rocker arm so as to be located below the venting bore when the rocker arm is in the open position. 19. The selectively openable lid of claim 18, wherein the lid has removal means for removing the rocker arm from the main body to facilitate cleaning the bores and the seals. 20. The selectively openable lid of claim 18, wherein the flanges and the bores are circular and wherein the venting flange is sufficiently resilient to deform into a conic section when the flange is received in t he venting bore.