Safety Device for Cap of Liner of Thermos Bottle

Abstract

A safety device of a cap sealing a liner of a thermos bottle comprises a rod of a pushing member passing through a through hole of a lock assembly that is for being screws with the opening of the liner wherein after the rod is pierced into an accommodating space of the lock assembly and combined with components therein, the rod juts out a fastening member deposited in the depression of the cap to be combined with a moving member, whereby when there is a pressurized steam in the liner, the steam lifts the pushing member so that the rod pushes upward to disengage the moving member from a recess of the fastening member and in turn sit the moving member in the corresponding gaps of the upper decorating plate so that this point, even if the cap is rotated, the cap does not drive the lock assembly to rotate.

1 . A safety device of a cap sealing a liner of a thermos bottle, wherein the safety device is assembled in the cap that is combined with an opening of the liner, and the safety device is characterized in:
 a rod of a pushing member passing through a through hole formed at a center of a lock assembly that is for being screwed with the opening of the liner; the rod being retained in an accommodating space of the lock assembly with a first blocker and a second blocker, which are further positioned with respect to the rod by a c-shaped ring; the lock assembly being covered by the cap; a fastening member being settled in a depression of the cap; a spring being deposited between the fastening member and the accommodating space of the lock assembly; a recess formed at an upper end of the fastening member fittingly receiving a moving member having a plurality of protrusions formed at a periphery thereof; a hole formed at a center of the fastening member allowing the rod to be pierced therethrough so that the rod can be combined with the moving member positioned thereon; and a plurality of cavities at an upper periphery of the cap being engaged with a plurality of hooks extended downward from an upper decorating plate, whereby   when there is a pressurized steam in the liner assembled with the safety device, the steam lifts the pushing member having the rod so that the rod pushes upward to lift the moving member so as to disengage the moving member from the recess and in turn sit the moving member in corresponding gaps of the upper decorating plate and at this point, even if the cap is rotated, the cap does not drive the lock assembly to rotate, thereby scaled-accidents caused by a user's incautiously opening the cap sealing the liner being efficiently prevented.   
   
   
       2 . The safety device of  claim 1 , wherein the fastening member settled in the depression at the center of the cover is combined with the lock assembly as a whole by a plurality of screws. 
   
   
       3 . The safety device of  claim 1 , wherein a plurality of spacers are extended downward from the upper decorating plate that is engaged with the cavities at the upper periphery of the cap so that the plural spacers define gaps for receiving the moving member when the moving member is lifted. 
   
   
       4 . The safety device of  claim 1 , wherein the pushing member combined with the rod that passes through the through of the lock assembly comprises a contacting portion for being pushed by the steam and a covering portion for retaining the rod. 
   
   
       5 . The safety device of  claim 4 , wherein the contacting portion and the covering portion of the pushing member combined at the end of the rod are made of a high-heat resistant and slightly flexible material.