Nm., 2%, Íig?ífâ. B. CHRISTENSON l 294339677 HOT WATER BAG Filed March 26, 1945 2 Sheets-Sheet l NGV. 26, Í946. E, CHRISTENSON ÉAÍLÉTÍ HOT WATER BAG Filed March 26, 1945 2 Sheets-Sheet 2 i'â/gel v l V575 fr?, ifi/Him!! 2,411,677 Patented Nov. 26, 1946 UNITED STATES PATENT OFFICEv 2,411,677 HOT-WATER EAG Een Christensen, Pasadena, Calif. Application. March 26, 1945, Serial No. 584,901 3 Claims. (Cl. 219-46) 1 2 My invention relates to improvements in hot water bags, the primary object in view being to equip such a device for heating by electricity with electrical heating means incorporated in the bag and fully protected against contact with the head I5, lateral intermediate lugs II thereon for engaging the outer end of the stopper 8,.and a threaded inner end I2 adapted to be turned into a threaded opening I3 formed in a bridge piece I4 traversing the inner end of said neck 5. As the pin 9 is turned into said opening I3, the lugs II compress the stopper 8 in the neck 5 to tightly close said neck. water. Another object is to equip such bags with elec trical heating means interposed between the walls of the bag and completely closed oir from water Within the bag i is a slab-like core if: of rec tangular form, and which is shorter than the bag in the bag. i to space the same from the bottom of said bag Still another object is to provide a hot water and from the neck 5, but is of a width to iit be bag equipped in the manner and for the purpose tween the edges 3 of said bag. The core I4 is above set forth which is comparatively inexpen preferably formed of rubber or rubber composi sive to manufacture and not liable to get out of order. 15 tion and is attached at its side edges I5 along the seams ¿l preferably by vulcanization. The Other and subordinate objects also compre sides of the core ifi between said edges thereof are hended by my invention, together with the pre detached from the sides of the bag I so that said cise nature of my improvements, will become bag may be distended by pressure of water there readily apparent when the succeeding description and claims are read with reference to the draw 20 in. Transverse through ports I5, preferably cy lindrical, are provided in the core I4 in longitudi ings accompanying and forming part of this spec nal rows, with the ports I6 in alternate rows stag ification. gered relative to those in intermediate rows, said In said drawings; ports providing for passage of water through the Figure 1 is a View in side elevation, partly bro ken away and shown in section, of a hot water 25 core from side to side of the bag I. The sides of the core I4 are corrugated by longitudinal grooves bag embodying my improvements; I'I arranged intermediate rows of ports I6, the Figure 2 is a view in edge elevation; grooves il on each side being opposite those on Figure 3 is a view in longitudinal section taken the other side of said core. The grooves I‘I re on the line 3_3 oi Figure l; duce the thickness of the core Ill between oppo Figure 4 is a view in transverse section oí the core; ` Figure 5 is a fragmentary view in longitudinal section taken on the line 5-5 of Figure 2 and drawn to an enlarged scale. Describing my invention in detail, with refer ence to the drawings by numerals, I designates the hot water bag, proper, which is formed of the usual material, such as rubber or rubber composi tion, and comprises sides ’E secured together at site grooves for a purpose presently seen. An elongated tapered tongue IB, forming an integral part of the core I 4, extends from the top edge of said core through the top of the bag at one side of the neck 5, and which is suitably attached to the top of the bag, as by vulcanization, to form a Water-tight seal between the same and said bag. Heating elements in the form of looped coils i9, 25 are embedded in the core I4 in a common the edges that is, the longitudinal edges, by 40 plane therewith to extend between the rows of ports I5 and along the top and bottom edges of seams, as at d, for instance by vulcanization. said core, the coils I9, 20 being reversed in one A filler neck 5 of suitable material, and pref element relative to those in the other element erably rectangular in cross-section, is inserted and the coils 2E) of one element extending into the into the top of the bag I centrally oi said top, and which tapers inwardly of the bag i and is pro 45 coils i9 oi the other element, the terminals 2I of the coil I9 and those 22 of the coil 2i) extending vided with a lateral intermediate flange 6 for into the tongue I8, and being connected by a suit clamping to the top oi the bag I on the inside able coupling 23 to an electric cable 24, of any thereof, and with a clamping collar 'I ñtting suitable type, extending out of said tongue I8 around said neck against the outside of said top and soldered or otherwise secured to said neck, 50 and provided with a suitable switch 25 therein such as is commonly used in regulating the degree as at 'l'. A stopper 8, preferably oi rubber, is provided for fitting into said neck 5 with a wedging action. of heat generated by electrical heating devices. As shown in Figure 1, the coils I9, 20 are arranged to extend around the ends of alternate rows of A locking pin 9 extends through said stopper 8, centrally, with an outer end, hand grip-forming 55 ports I6, respectively. 3 2,411,677 4 The manner in which the described invention operates will be readily understood. The de scribed heating coils, or loops, I9, 20 heat the core edges of the core being connected to said edges 1. A hot water bag having longitudinal edges ting in the bag between the edges thereof, said of the bag, the sides of the bag being free from connection with said core, a tongue extending I4 which heats the water in the bag l, and said from the top edge of said core out of the top of core provides heat-transfer surfaces of maximum said bag, electrical resistance coils embedded in area, whereby the water is quickly heated to a said core in substantially the plane thereof and high temperature. The core I4 being flexible having terminal ends extended into said tongue, does not interfere with using the bag in the usual and an electric cable extending from said tongue manner, and the ports I6 and grooves I1 render and to which said terminals are connected, said the core light in weight, yet strong, and reduce 10 core having transverse ports therein for the pas the amount of space ñlled by said core. sage of water through said core and arranged in The foregoing will, it is believed, sufiice to im rows with the ports in alternate rows staggered part a clear understanding of my invention with relative to the ports in intermediate rows to pro out further explanation. vide for a maximum number of ports in said core, Manifestly, the invention, as described, is sus 15 said coils extending between rows of ports and ceptible of modiiication without departing from around the ends of alternate rows, respectively, to the inventive concept, and right is herein re prevent water from contacting the same. served to such modifications as fall within the 3. A hot water bag having longitudinal edges scope of the appended claims. and sides, a slab-like rectangular core of ñexible What I claim is: 20 insulating material having longitudinal edges ñt and sides, a slab-like rectangular core of flexible edges of the core being connected to said edges of insulating material having longitudinal edges f1t the bag, the sides of the bag being free from con ting in the bag between the edges thereof, said nection with said core, a tongue extending from edges of the core being connected to said edges of 25 the top edge of said core out of the top of said the bag, the sides of the bag being free from bag, electrical resistance coils embedded in said connection with said core, a tongue extending core in substantially the plane thereof and hav » from the top edge or" said core out of the top of ing terminal ends extended into said tongue, and said bag, electrical resistance coils embedded in an electric cable extending from said tongue and said core in substantially the plane thereof and 30 to which said terminals are connected, said core having terminal ends extended into said tongue, having transverse ports therein for the passage of and an electric cable extending from said tongue water through said core, and arranged in rows and to which said terminals are connected, said with the ports in alternate rows staggered relative core having transverse ports therein for the pas to the ports in intermediate rows to provide for a sage of water through said core, and arranged in maximum number of ports in said core, said coils rows with the ports in alternate rows staggered extending between rows of ports and around the relative to the ports in intermediate rows to pro ends of alternate rows, respectively, to prevent vide for a maximum number of ports in said core. water from contacting the same, said core being 2. A hot water bag having longitudinal edges provided with longitudinal side grooves to reduce and sides, a slab-like rectangular core of flexible 40 the thickness thereof between the grooves and fa insulating material having longitudinal edges ñt cilitate transfer of heat through the core. ting in the bag between the edges thereof, said BEN CHRISTENSON.