Portable warm bag having steam heating device

A portable warm bag having steam heating device includes a rectangular bag having a pressure sensor, a pressure releasing valve, a switch bottom and a valve cover on both sides of the upper lid, a partition vertically disposed in the bag adjacent a lateral side thereof to define a gap therebetween to receive a vapor creater therein which supplies the vapor into the food containing space via a hose and through a perforated plate above the bottom of the bag, a power source compartment under the bottom of the bag containing a plurality of rechargeable batteries therein for heating a heating bar in the vapor creater to boil the water to create vapor to into the bag to establish a heating circulation into the food which is kept at constant temperature eatable to the user.

BACKGROUND OF THE INVENTION

The present invention relates to the food carrying apparatus and more particularly to a portable warm bag having steam heating device which is able to create steam circulating in the bag to heat the food to a desired temperature.

People are used to carry a portable warm bag containing food to go outdoor to sponsor a picnic or other activities. The food in the bag will be warm and eatable.FIG. 1shows a prior art warm bag10which is made of heatproof material has a lid11connected with one edge of its opening and fastened by a zipper13and a suspender12connected with two lateral sides to facilitate the user to carry the bag10. This type of warm bag10has at least the following disadvantages:a) the heatproof effect is very pool. The temperature of the food in the bag can only keep few hours, especially in the winter time or snowing days, than the heatproof effect for food is rather worse it is no use for a worker, a student or a traveler,b) in summer time, although the temperature of the food containing in this bag may keep a longer time, but if there is no any heating device in the bag to continuously heat the food which will be easily fermented and/or deteriorated that becomes not eatable.

Some of the warm bags utilize the electricity to heat the food to keep the food at a constant temperature. Yet this type of warm bag has usually a large volume and the electricity is coming from an automobile which is unsuitable to a student or a worker because they need a small sized portable warm bag.

SUMMARY OF THE PRESENT INVENTION

The present invention has a main object to provide a portable warm bag having steam heating device which has self-support power source and a vapor creator to continuously provide the steam to heat the food which is kept at a constant temperature, no matter whether is in the summer or winter time.

Another object of the present invention is to provide a portable warm bag having steam heating device which not only keeps the temperature but also keeps the humidity of the food for which the original delicious condition is therefore maintained.

Accordingly, the portable warm bag of the present invention comprises generally a rectangular bag made of heatproof material and having a perforated plate above the bottom, a power source compartment under the bottom electrically connected with a vapor creater in an inner side of the bag and at least a hose having one end connected to an upper portion of the vapor creater and the other end extended downward to a space under the perforated plate. The vapor creater contains a predetermined amount of fresh water and a heating bar which is effected by the power source to boil the water to become vapor flowing out of the vapor creater through the hose so as to establish a steam heating circulation in the food.

The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference toFIGS. 1 to 4of the drawings, the portable warm bag having steam heating device of the present invention comprises a rectangular bag20which is made of flexible heatproof material so is foldable and has a lid201on the top partially connected to an upper edge thereof and fastened by a first zipper202, a temperature sensor203and a pressure releasing valve204spacedly disposed on the inner surface, a valve cap205and a switch button29spacedly disposed on the outer surface thereof, a partition24vertically disposed in the bag20adjacent a lateral wall of the bag20to define a gap therebetween for receiving a vapor creater22, wherein the partition24has a plurality of first through holes241spacedly formed in upper portion and the vapor creater22is a box containing a predetermined amount of water and an upright heating bar222on the bottom, a cap223releasably closing the top and plurality of second through holes221spacedly formed in upper portion of a lateral wall engaged with the first through holes241of the partition24, at least a hose23having upper end inserted into the vapor creater22through the through holes221and241and a lower end extended to the bottom of the bag20, a perforated plate25disposed into the bag20above the bottom thereof having a plurality of voids251in the entire surface and a plurality of semi-circular slots252spacedly formed in an edge engaged with the hoses23, a food containing space26above the perforated plate25, a power source compartment27formed under the bottom of the bag20electrically connected with the heating bar222for containing a plurality of the rechargeable batteries21or a portable storage cell (not shown), an openable plate271closing the compartment27which is fastened by a second zipper272and a suspender28having two end respectively connected to the upper outer surface of two lateral walls of the bag20for carrying the bag20.

Upon the above discussed structure, when press the switch button29downward, the batteries21immediately supply the electricity to heat the heating bar222which in turn heats the water in the vapor creater22. When the water is boiled, the vapor is created and flowing into the space between the bottom of the bag20under the perforated plate25which leads the steam flowing upward to heat the containing food which is gradually becoming hot at a constant temperature. If the steam becomes stronger and stronger in bag20and the vapor pressure is found excessive. The user may open the cap205of the pressure releasing valve204. Then opens the lid201of the bag20and picks the food to eat. The sensor203has the function to detect the pressure condition inside the bag20. Once the sensor found the vapor pressure in the bag20is excessive, it will automatically turn off the power source. In addition, if the water in the vapor creater is consumed to a lowerst amount, the power source will be also turned off to allow the replenishing the fresh water into the vapor creater22. So that the warm bag20of the present invention provide strong safety to the user even the partition24is able to prevent the user from to scalded by directly touching the vapor creater22. Because the steam heating device can keep the food fresh in the original humidity and delicious condition. Besides, this warm bag20suits to the students, the workes, the travelers and in the picnic no matter it is used in the summer or winter time. Due to that this bag20is made of flexible heatproof material, it is foldable to facilitate the user keeping and or bring with it.

Note that the specification relating to the above embodiment should be construed as an exemplary rather than as a limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.