Insulated mug

Abstract

An insulated mug includes a tubular coupler, an outer container shell, an inner container shell, a buffering member, a first annular gasket, a lid, and a second annular gasket. The upper and lower external threads of the tubular coupler are respectively engaged with the internal threads of the lid and the internal threads of the outer container shell. An insulating space is defined between the outer container shell and the inner container shell to reduce thermal conduction between the two shells. The inner container shell is snugly sandwiched between the first annular gasket and the buffering member to protect it against shock or vibration. The lid, fitted with the second annular gasket, is in sealing engagement with the tubular coupler to prevent a beverage contained in the inner container shell from spilling.

I claim: 
     
         1 . In an insulated mug including an outer container shell defining a top opening, an inner container shell of heat-resistant glass material defining a top opening and having an external diameter less than the outer container shell and located within the outer container shell, and a lid of food-safe, heat-resistant plastic material defining a bottom opening, wherein the improvement comprises:
 the outer container shell is provided with internal threads at its inner surface, near its top opening;   a buffering member, which has an outer enclosing wall and a plurality of inner enclosing walls, is placed on an inner surface of a bottom of the outer container shell, wherein the outer enclosing wall has a height greater than the inner enclosing walls, and the outer enclosing wall is fitted about a bottom of the inner container shell;   a tubular coupler of food-safe, heat-resistant plastic material, which has upper external threads and lower external threads on its outer surface and an inner projecting ring on its inner surface, is connected with the lid and the outer container shell, wherein an annular groove is defined between the upper external threads and the lower external threads, and the lower threads are engaged with the internal threads of the outer container shell;   a first annular gasket of food-safe, heat-resistant silicone material is placed between the inner projecting ring of the tubular coupler and a top edge that surrounds the top opening of the inner container shell; and   the lid is provided with internal threads on its inner surface for engaging with the upper threads of the tubular coupler and defines an annular recess at an inner top surface thereof for receiving a second annular gasket that is placed on top of the tubular coupler;   whereby the inner projecting ring of the tubular coupler will force the first annular gasket, the inner container shell, and the buffering member towards the bottom of the outer container shell, so that the inner container shell is snugly sandwiched between the annular gasket and the buffering member, so that the inner container shell is securely fixed in the outer container shell, and the lid is in sealing engagement with the tubular coupler to prevent a beverage contained in the inner container shell from spilling.   
     
     
         2 . The insulated mug of  claim 1 , wherein the outer container shell is provided with drawings, characters, or patterns on its outer surface. 
     
     
         3 . The insulated mug of  claim 1 , wherein a filtration screen is provided on the inner projecting ring of the tubular coupler to facilitate a user to make leaf or fruit tea in the inner container shell. 
     
     
         4 . The insulated mug of  claim 1 , wherein the tubular coupler is provided at its outer surface with two opposite downwardly extending hooks immediately above the annular groove; the annular groove is fitted with a closed band to facilitate a user to carry the insulated mug.