the present invention is explained in further detail as below with reference to the drawings . the portable slow cooker in this embodiment as show in fig1 to 14 includes a cooking body 3 , a liner container 2 disposed within the cooking body 3 , a lid 1 disposed on the liner container 2 covering the opening end of the liner container 2 , a handle 4 , a handle box 5 fixed on the two end side surface of the cooking body 3 , and a sealing ring 6 disposed around the outer rim of the lid 1 , and within the handle box 5 is provided with a handling position and a fixed position . the handle 4 has two lower ends that can remove upward and downward to be fixed in the handle box 5 , and selectively be fixed at the handling position or fixed position of the handle box 5 , has an inverted u shape , and is disposed over the lid 1 . when the two ends of the handle 4 are fixed at the fixed position of the handle box 5 , the handle press tightly on the grip of the lid 1 , making the lid 1 , the sealing ring 6 and the liner container 2 closely joint together , insuring food within the liner container not spill out or pour out . when the two ends of the handle 4 are at the handle position of the handle box 5 , the pressing force upon the lid 1 by the handle 4 is released , so that the lid 1 and the liner container 2 can be picked up or placed freely , and the handle 4 can also rotate freely . as shown in fig2 and 12 , the handle box 5 of the present embodiment comprises a box base 51 , a box lid 52 , a positioning buckle 53 , a resetting spring sheet 54 and a trigger 55 . the box base 51 was fixed to the cooking body 3 via fasteners , e . g ., screws . the outside wall of the box base 51 is closely next to the side wall of the cooking body 3 . the inner side wall of the box base is provided with a horizontally projecting spindle 511 and 512 . the box lid 52 is fixed on the box base 51 via fasteners , e . g ., screws , and a cavity is formed between the box lid 52 and the box base 51 . along the vertical direction of the outsider of the box lid 52 is provided with a locating cylinder 522 , which has an upper end opened , for the upward and downward movement of the handle . a slide groove 521 is disposed on the box lid 52 , corresponding to the locating cylinder 522 , and the box lid 52 is provided with a hole 523 in the lower end . the positioning buckle 53 of sheeting structure is provided with a axial - hole 531 and a fillister shaped higher latching position 532 in the upper end , and with a fillister shaped lower latching position in the lower end , wherein a cam shaped or inclined face transition is formed between the bottom of the higher latching position 532 and the top of lower latching position 533 . the higher latching position 532 is the handling position of the handle box , and the lower latching position 533 is the fixed position of the handle box . via the matching of the axial - hole 531 and the spindle 511 , the positioning buckle 53 is assembled within the chamber between the box base 51 and the box lid 52 . the arc shaped resetting spring sheet 54 , engaged at the side of the positioning buckle 53 , has a hook 541 in the end which is matched with the edge 512 to fix the resetting spring sheet 54 within the chamber between the box base 51 and the box lid 52 , the spring force formed by the resetting spring sheet 54 against the positioning buckle 53 enable the positioning buckle 53 to rotate around the spindle 511 in a certain angle . the trigger 55 is utilized by users to overcome the spring force of the resetting spring sheet 54 , enable the positioning buckle 53 to rotate in the reverse direction to relieve the locked status , to switch the handle 4 from the fixed position of the handle box 5 to the handle position . the trigger 55 and the positioning buckle 53 are integrally designed in the present embodiment . the trigger 55 , horizontally projecting through the hole 523 in the lower end of the box lid 55 , is positioned at the bottom of the positioning buckle 53 . to obtain a similar effect , the trigger 55 may also be dependent from the positioning buckled , and then fixedly assembled together . to increase the upward restoring force of the handle from the fixed position to the handle position , a spring 56 , which has one end abutting on the end of the handle 4 , and another end abutting on the bottom of the locating cylinder 522 of the box lid , can be further provided in the present embodiment . referring to fig1 , each of the ends of the handle 4 is provided with a projecting rotate shaft 41 in the horizontal direction and a groove 43 in the vertical direction , in the present embodiment . a position - limiting projection 42 of a rather big size is provided at the end of the rotate shaft 41 , to prevent the handle from sliding off the handle box . the groove 43 is use for engaging the spring 56 , to locate the telescopic position of the spring 56 . as shown in fig4 , 5 , 6 , and 7 , each of the ends of the handle is positioned at the opening of the locating cylinder 522 . the position - limiting projection 42 of the handle goes through the slide groove 521 and the higher latching position 532 of the positioning buckle , to engage the rotate shaft 41 in the slide groove 521 and the higher latching position 532 of the positioning buckle in this circumstance , the positioning buckle 53 , the resetting spring sheet 54 and the spring 56 are on the status of free resetting , where the handle 4 is fixed at the handle position of the handle box 5 , not stressed , and may rotate around the rotate shaft 41 , having not locked the lid 1 and the liner container 2 . when the handle 4 rotates to a vertical direction as shown in fig4 , the rotate shaft 41 of the handle is engaged at the top of the slide groove 521 , and the position - limiting projection 42 is engaged at the top of the higher latching position 532 of the positioning buckle , and therefore the handle is fixed within the handle box out any possibility of sliding off , and the slow cooker can be lifted by lifting the handle upward to move in a short distance . while the handle 4 rotates to an inclined direction as shown in fig7 , the liner container 2 and the lid 1 can be conveniently picked and placed . as shown in fig8 and 9 when the handle is positioned in the vertical direction , unlocked , the handle 4 will overcome the force of the spring 56 to move along the locating cylinder 522 if a stress is forced on the handle 4 downward , then the rotate shaft 41 of the handle will move downward along the slide groove 521 , and press the cam shaped junction between the higher latching position 532 and the lower latching position 532 , making the positioning buckle press the resetting spring sheet 54 and rotate around the spindle 511 , until the rotate shaft 41 move to the lower latching position 533 of the positioning buckle . as shown in fig1 and 11 . the positioning buckle 53 rotates reversely under the reacting force of the resetting spring sheet 54 , engaging the rotate shaft 41 at the lower latching position 533 , and thus the handle 4 is fixed at the fixed position of the handle box . the handle 4 press tightly on the grip of the lid 1 , forming a tight fitness among the lid 1 , the sealing ring 6 and the liner container 2 , in this locked status , food within the liner container will not spill out or pour out , and thus the whole slow cooker can be lifted , or be suitable for long distance movement , or be placed on cars or other carriers that may slightly jounce . when the slow cooker is under locked status as shown in fig1 , the positioning buckle 53 can be driven to press the resetting spring sheet 54 and rotate around the spindle 511 by applying a horizontal force on the trigger 55 . the rotate shaft 41 of the handle leave the lower latching position 533 , and simultaneously , under the upward force by the users or the restoring force by the spring 56 , the handle 4 drives the rotate shaft 41 to move upward along the locating cylinder 522 , engaging the rotate shaft 41 at the higher latching position 532 , and therefore , it returns to a free status , unlocked , as shown in fig4 , where the handle 4 can return from the fixed position of the handle box to the handle position . as shown in fig1 , the spring 56 in the present embodiment is substituted by a tension spring 56 ′. the tension spring 56 ′, which has one end fixed on the box base , and another end fixed on the rotate shaft 41 of the handle , can be equally effective . the resetting spring sheet 54 can be substituted by a compression spring in the present embodiment . the compression spring , which has one end abutting on the side wall of the box base , and another end abutting on the side wall of the positioning buckle , can be equally effective . in the locked status of the present embodiment , the handle box 4 presses tightly on the grip of the lid 1 , forming a tight fitness among the lid 1 , the scaling ring 6 and the liner container 2 . of course , if the structure of the handle 4 is improved , it will still be within the protection scope of the present invention , e . g ., the width of the handle 4 corresponding to the grip of the lid is broadened , and a hole is provided in the center , so that the handle 4 can avoid the grip of the lid 1 , press tightly on other elements of the lid 1 , forming a tight fitness among the lid 1 , the sealing ring 6 , and the liner container 2 . as shown in fig1 to 24 , the slow cooker in the present embodiment includes a cooking body 3 ′, an liner container 2 ′ disposed within the cooking body 3 ′, an lid 1 ′ disposed on the liner container 2 ′ covering the opening of the liner container 2 ′, a handle 4 ′, a handle box 5 ′ fixed on the two end side surface of the cooking body 3 ′, and a sealing ring 6 ′ disposed around the outer rim of the lid 1 ′. different from the embodiment 1 , the handle box 5 ′ in the present embodiment includes a box base 51 ′, a box lid 52 ′, a positioning buckle 53 ′, a trigger 55 ′, and a spring 56 ″. the box base 51 ′ is fixed to the cooking body 3 ′ via fasteners , e . g ., screws . the outside wall of the box base 51 ′ is closely next to the side wall of the cooking body 3 ′. the inner side wall of the box base 51 ′ is provided with two parallel locating wings 513 ′ in the vertical direction . a skid 514 ′ for the upward and downward movement of the handle 4 ′ is formed between the two locating wings 513 ′. a fillister 515 ′ is provided at the top end of the skid 514 ′, forming the handle position of the handle box 5 ′ at the area of the fillister 515 ′. the fix position of the handle box 5 ′ is formed at the lower end of the skid 514 ′. the box lid 52 ′ is fixed on the box base 51 ′ via fasteners , e . g ., screws , and a cavity is formed between the box lid 52 ′ and the box base 51 ′. the upper part of the box lid 52 ′ corresponding to the skid 514 ′ of the box base is provided with a groove 524 ′ for the assembly and movement of the handle 4 ′. each of the two side walls of the groove 524 ′ is provided with a horizontal extrusion facing toward the box base 51 ′ at the top , and with a parallel barrier walls 525 ′ in the vertical direction at the middle part , wherein the barrier walls 525 ′ is provided with horizontally projecting assembling shafts 526 ′, respectively , facing each other . the positioning buckle 53 ′ of which the top end forms a latching position 534 ′, and the lower end is provided with a snap - in hook 535 ′, has an inverted u shape . the upper end of the trigger 55 ′ of the present embodiment is provided with two legs , each of which is provided with a sleeve 551 ′ at the end , respectively . the size of the sleeve 551 ′ is in correspondence with the assembling shaft 526 ′ of the box lid , and by matching with the assembling shaft 526 ′, the trigger 55 ′ are driven to rotate around the assembling shaft 526 ′. at the middle part of the legs are provided with a support shaft 552 ′ which forms a connection between the two legs . the size of the support shaft 552 ′ is in correspondence with the snap - in hook 535 ′ of the positioning buckle , and via the matching of the support shaft 552 ′ and the snap - in hook 535 ′, the positioning buckle 53 ′ is rotatably fixed to the support shaft 552 ′, forming a hinge structure with the trigger 55 ′. to enhance the upward restoring force of the handle 4 ′, a spring 56 ″, which has one end abutting on the end of the handle 4 , and another end abutting on the bottom of the handle box 5 ′, is further provided in the present embodiment . each of the two ends of the handle 4 ′ is provided with an outward projecting lock catch 44 ′ when the trigger 55 ′ rotate around the assembling shaft 526 ′, the lock catch 44 ′ can be engaged into the latching position 534 ′ of the positioning buckle 53 ′, enforcing the handle 4 ′. slider 45 ′ is respectively movably fixed to each of the ends of the handle box 4 ′, via connecting elements 46 ′, which has end designed as spherical surface to match with the fillister 515 ′ of the skid . the slider 45 ′ has an inverted t shape , defined within the skid 541 ′ by the two side walls of the groove 524 ′, the horizontal extrusion of the side wall and the barrier wall 525 ′. as shown in fig1 and 18 , the slider 45 ′ of the handle is disposed at the upper end of the skid 514 ′, the spherical surface of the connecting element 46 ′ is matched with the fillister 515 ′ of the skid 514 ′. in this status , the handle 4 ′ is fixed in the handle position of the handle box 5 ′. the positioning buckle 53 ′, the trigger 55 ′ and the spring 56 ″ are on the status of free resetting , and the handle 4 ′ are unstressed , having not locked the lid 1 ′ and the liner container 2 ′, and may rotate around the connecting element 46 ′. when the handle 4 ′ rotates to the vertical direction as shown in fig1 , the slider 45 ′ of the handle is located by the two side walls of the groove 524 ′ and the horizontal extrusion at the top of the two said side walls : the handle 4 ′ is restricted within the handle box 5 ′. thus , the slow cooker can be lifted by lifting the handle 4 ′ upward , and is suitable for picking and placing properly in a short distance . when the handle 4 ′ rotates to an inclined direction as shown in fig1 , the liner container 2 ′ and the lid 1 ′ can be conveniently picked and placed . as shown in fig2 , when the handle is in the vertical direction as shown in fig1 , unlocked , the trigger 55 ′ will be driven to rotate upward around the assembling shaft 526 ′ if the trigger 55 ′ is forced , and thus the positioning buckle 53 ′ removes upward , rotatable around the trigger 552 ′. when the trigger 55 ′ and the positioning buckle 53 ′ rotate through the dot line from the free status to the solid line as shown in the figure , the lock catch 44 ′ can be engaged and interfered by the positioning buckle 53 ′, and thus , the force of the spring 56 ″ can be overcome by the handle 4 ′ by applying a reacting force on the trigger 55 ′, moving downward along the skid 514 ′, until the handle 4 ′ reaches the lower end of the skid 514 ′ of the handle box . as shown in fig2 and 22 . because of the self - locking characters of the trigger 55 ′, it will not release by itself , and thus the handle 4 ′ is fixed at the fixed position of the handle box 5 ′, pressing tightly on the lid 1 ′, forming a tight fitness among the lid 1 ′, the sealing ring 6 ′ and the liner container 2 ′. therefore , it is on the locked status , preventing the food within the liner container 2 ′ from spilling out or pouring out . in this case , the whole slow cooker can be lifted , suitable for long distance movement , or for placing on cars or other carriers that may slightly jounce . when the slow cooker is on the locked status , as shown in fig2 , the trigger can overcome the locking force of itself to rotate upward by applying a force on the trigger 55 ′. thus the interference force on the handle by the positioning buckle 53 ′ is released , and the handle 4 ′ can make the slider 45 ′ to move upward along the skid 514 ′ of the box base , by the upward force applied by the users , or by the resetting force of the spring 56 ″. then , the connecting element 46 ′ is matched with the fillister 516 ′ of the box base , and the handle 4 ′ returns to the higher latching position of the handle box 5 ′, returning to the free status as shown in fig1 , unlocked , and therefore the handle 4 ′ returns from the fixed position of the handle box 5 ′ to the handle position .