Self righting drinking cup with twist on base

A self righting cup with a removable base comprising:

• a hollow cup member having a tubular side wall, a bottom wall closing the bottom of said tubular sidewall, said bottom wall having a substantially planar lower surface, two generally arcuate shaped handles extending radially out from diametrically opposite sides of said sidewall, said handles are substantially vertical and are attached to the sidewall adjacent the top and bottom edges of said sidewall,
• a lid is sealingly secured to the top of said sidewall, a drinking spout is located on top of said lid to one side of said lid, a vent hole passes through the top of said lid to the side of said lid opposite said drinking spout,
• a weighted base member releasably attached to the lower surface of said cup member, said base member having a planar upper surface opposite said lower surface of said cup member, said base member having a convex sidewall that tapers from said upper surface to a lower horizontal planar bottom surface,
• at least one arcuate ridge on one of said upper and lower surface and a circular groove on the other of said upper and lower surface, said ridge and groove being sized such that said ridge is received in said groove in a closely mating and rotationally sliding manner,
• two resilient clips extending upwards from diametrically opposite edges of the upper surface of said base member, said clips extending upward along the outside of said sidewall of said cup member, facing in the same circumferential direction and being sized to resiliently clip on said handles upon rotation of said base member upon the lower surface of the cup member.

A self righting drinking cup comprising:

• a hollow cup container having a substantially cylindrical vertical sidewall, a substantially planar horizontal bottom wall enclosing the bottom of said cup container, said bottom wall having a substantially planar lower surface,
• a weighted base member having an upper surface, a rounded convex outer surface that tapers from said upper surface to a planar horizontal bottom surface upon which the cup stands when placed upon a flat surface, said convex outer surface and said bottom surface are concentric to a vertical axis which passes through the center of said cup,
• cooperating means on said lower surface of said cup container and said upper surface of said base member to rotatably aligning said base member on said lower surface of said cup container,
• two arcuate-shaped handles extending out from diametrically opposite sides of said cup container, lower ends of said handles being attached to said sidewall adjacent the bottom edge of said sidewall,
• resilient clip means on said base member for resiliently clipping onto said lower ends of said handles upon rotation of said base member on said lower surface of said cup container thereby vertically and rotatably securing said base member on said lower surface of said cup container.