BACKGROUND OF THE INVENTION

a) Field of the Invention

The present invention relates to a locking device for replacing a liner in a thermos, and more particularly to a locking device that locks and positions a liner stably with an elastic effect after replacing and assembling the liner in a drinking container. The locking mechanism utilizes primarily an elastic force from a tightening ring to result in an elastic combining ability at high pressure by a locking action of a connecting ring, so that the mineral liner can be combined stably in the barrel, and the mineral liner can be withdrawn and replaced after pulling out the connecting ring.

b) Description of the Prior Art

During the leisure time in taking an outdoor activity, many designs of thermos containers can be used for keeping temperature of foods or beverages. The thermos containers are basically based on the adiabatic effect, in order to preserve the temperature of foods or beverages. In an early design, the liner in the thermos is made of metal or plastic, which is unable to withstand various chemical properties of the foods, such as acid-base or salinity. Therefore, the interior surface of the metallic liner can be coated with Teflon as a basis for withstanding acid-base. However, the Teflon coating will be worn out after brushing the liner.

A Taiwanese patent No. 103212060 discloses a thermos with a ceramic liner, wherein an outer bottle is disposed outside the main body of the thermos, and a ceramic liner is disposed in the space within the thermos. A top rim of the ceramic liner is an upper annular opening which is tightly combined with the rim of ceramic liner by sheathing. However, as ceramic is brittle, it is not appropriate for combining the upper annular opening with the rim of ceramic liner by squeezing. In addition, while using the thermos, the ceramic liner will absorb a shock wave and fracture when the bottle is subjected to an external force.

Moreover, although there are replaceable designs for a conventional thermos with the ceramic liner, the design of safety protection and effective combination is not available.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a locking device for replacing a liner in a thermos, wherein the locking device locks and positions a liner stably with an elastic effect after replacing and assembling the liner in a drinking container. The locking mechanism utilizes primarily a tightening ring with an elastic force, which is clamped between a mineral liner and a barrel by filling. The tightening ring is acted upon by the spinning of a connecting ring to result in a strong reaction force, so that the liner can be locked and assembled by the elastic tightening action.

A second object of the present invention is to provide a locking device for replacing a liner in a thermos, wherein an outer surface on a top end of the barrel is provided with a twist-on member, an inner circumference of the twist-on member is provided with a binding plane, an inner bottom of the binding plane is annularly provided with an inner shoulder plane, an upper part of the connecting ring is provided with a covering thread, a lower part of the connecting ring is provided with a lock-joint member, an inner circumference of the lock-joint member is provided with an inner thread, and a top end of the inner thread is provided with a push-down inner shoulder. A spinning lead of the inner thread is provided, allowing the push-down inner shoulder to actually push down the tightening ring that the tightening ring can be forced upon actually.

A third object of the present invention is to provide a locking device for replacing a liner in a thermos, wherein a top surface of the tightening ring is a surface of a snapping structure and the push-down inner shoulder of the connecting ring is provided correspondingly with a snap tooth to fix the connecting ring with the spinning end of the barrel by mechanical snapping.

A fourth object of the present invention is to provide a locking device for replacing a liner in a thermos, wherein a front end or a rear end of a helical line of the twist-on member of the barrel is provide with a protruded buckle, and an interior of the inner thread of the connecting to ring is provided with an elastic slot corresponding to the buckle. Upon combining the twist-on member with the connecting ring to reach the end of locking, the buckle can be snapped in by the introduction of the elastic slot; therefore, the spinning angle of the connecting ring relative to the barrel will be immobilized to fix the locking angle.

To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments.

