Abstract:
A heater device includes a pad that is heated by electrically heated fluid and which has areas for a user to insert his or her feet and areas for a user to insert his or her hands whereby either or both the user&#39;s feet and/or hands can be heated in an efficient manner.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to the general art of footwear, and to the particular field of protective footwear. 
   2. Description of the Related Art 
   In recent years, a great many people are engaging in outdoor sports such as skiing as well as many outdoor activities, including working. Those who engage in these activities are often exposed to the elements for extended periods of time. Such exposure can lead to discomfort or, more seriously, to frost bite particularly in the extremities. It is therefore vital that people who may spend a great deal of time outdoors seek protection from the elements in order to prevent the occurrence of exposure and frost bite. 
   The cooling of the extremities, has long been recognized as a serious deterrent to performing activities in cold temperatures and various proposals have been advanced for dealing with this problem. In the case of feet, most footwear known to the inventor, which has been designed for use in cold weather, has utilized hard and heavy materials on the sole and sometimes on the uppers as well. For instance, hard rubber soles are most commonly used for winter boots and overboots. Since such footwear is generally constructed with rigid sole structures, carrying and storing the footwear can be difficult. 
   Also, other footwear known to the inventor, designed for use in cold weather, has utilized conventional insulating materials, such as goose down, stiff insulating foam or synthetic fibers, to reduce the loss of heat from the wearer&#39;s foot. While these insulating materials attempt to minimize the heat loss from the wearer&#39;s foot, all of these insulating materials have various drawbacks. 
   A foot cover that is easy to manufacture, is easy to use, is lightweight, is easy to carry, is easy to store, is washable, and is highly effective at keeping the wearer&#39;s feet warm would be of considerable value. 
   A variety of other devices and methods are known for this purpose. For example, footwear can be provided with insulation or made waterproof. Such methods have significant drawbacks. For example, waterproofing methods provide no manner of either retaining heat or providing additional heat to the wearer&#39;s feet. Rather, they only prevent the introduction of water or other liquid, which could make the wearer&#39;s feet cold. Insulation is largely ineffective as well because it merely retains body heat without providing any additional heat. 
   One method of providing a heat source in footwear involves placing an electric heating element in the shoe or boot liner and using a battery to supply energy to the heating element. Another attempt to solve the problem of cold feet has involved the use of electrical heating elements in socks. Foot warming devices that use electric heating elements have a number of disadvantages. First and foremost, they can be dangerous. Specifically, they can create the risk of electric shock, sparks that could cause flammable socks and/or footwear materials to catch fire which in turn could burn the wearer&#39;s feet, and electrical shortages. Such electrical devices can also be expensive and inconvenient to use. 
   It is also known to adapt the insoles of boots, shoes and the like to accommodate a heat dispensing material in a pocket formed in the insole. These devices also have significant disadvantages. Specifically, they contemplate permanently modifying the footwear itself to accommodate the heat dispensing material. This could permanently add weight and bulk to the footwear which is unnecessary, especially when the footwear is worn in warm environments. In addition, these devices do not allow for adequate circulation of the generated heat to the wearer&#39;s feet. 
   Some prior art foot warmers include a removable insole for footwear that has a reduced thickness portion in the padding layer creating a cavity for holding a heat source that produces heat from an exothermic chemical reaction. These insoles often have an upper layer that has a plurality of holes for facilitating heat transfer from the heat source to the wearer. 
   Although an improvement, these insoles also have significant drawbacks. First and foremost, the heat source is generally enclosed in the cavity in such a way that the amount of air that can reach the heat source is limited. Thus, because the heat source needs oxygen to drive the chemical reaction necessary to generate heat, the amount of heat produced is greatly inhibited. The heat source is also enclosed in the cavity in such a way that the heat generated by the heat source cannot adequately circulate so that the wearer&#39;s feet are not effectively heated. 
   Still further, while a person&#39;s feet have received much attention in the above-described situations, a user&#39;s hands also may suffer the same problems when exposed to cold temperatures. While the inventor is aware of several devices that are intended to keep a user&#39;s hands warm, including gloves, mittens, heated gloves and mittens, the inventor is not aware of any device that can be used for either or both a user&#39;s feet and/or hands. Accordingly, a user is required to carry items for his or her hands as well as additional items for his or her feet. This can be cumbersome and inconvenient. 
   Therefore, there is a need for a device that can be used to heat a user&#39;s feet and/or hands. 
   PRINCIPAL OBJECTS OF THE INVENTION 
   It is a main object of the present invention to provide a device for efficiently heating a user&#39;s feet and hands. 
   It is another object of the present invention to provide a device which can efficiently heat both a user&#39;s feet and hands. 
   It is another object of the present invention to provide a device for heating a user&#39;s feet and hands and is convenient and easy to use. 
   SUMMARY OF THE INVENTION 
   These, and other, objects are achieved by a heater device that includes formed areas for both feet and hands whereby a user can insert his or her feet or hands to be warmed. The device includes a pad that is heated by coils that are electrically heated and transfer the electric heat to a fluid and transfer the heat from the fluid to the pad. 
   Using the heater device embodying the present invention will permit a user to heat his or her hands and/or feet as needed. The device is convenient, safe and efficient. 

   
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
       FIG. 1  is a perspective view of a hand and foot heater device embodying the present invention in a use condition. 
       FIG. 2  is an elevational view taken along line  2 - 2  of  FIG. 1 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Other objects, features and advantages of the invention will become apparent from a consideration of the following detailed description and the accompanying drawings. 
   Referring to the Figures, it can be understood that the present invention is embodied in a hand and foot heater device  10  that achieves the above-stated objectives. 
   Device  10  comprises a base pad  12  which includes a first layer  14  that is a bottom layer when base pad  12  is in use. First layer  14  has a first surface  16 , that is an outer surface when base pad  12  is in use, and a second surface  18 , that is an inner surface when base pad  12  is in use. First layer  14  further includes and a peripheral edge  22 . First layer  14  can be rubber-like material to prevent slipping if desired. 
   Base pad  12  further includes a second layer  30  that is a top layer when base pad i 12  is in use. Second layer  30  has a first surface  32 , that is an outer surface when base pad  12  is in use, and a second surface  34 , that is an inner surface when base pad  12  is in use. Second layer  30  further includes a peripheral edge  36 . 
   Peripheral edge  22  of the first layer  14  is connected to peripheral edge  36  of the second layer  30 . 
   Inner surface  18  of the first layer  14  is spaced apart from inner surface  34  of the second layer  30  and an interior volume  40  is defined between the inner surface  18  of the first layer  14  and the inner surface  34  of the second layer  30 . 
   Two shoe-shaped shoe-accommodating units  50  and  52  are located on second layer  30  to be located on first surface  32  of the second layer  30 . Two hand-shaped hand-accommodating units  60  and  62  are located on first surface  32  of the second layer  30 . Hand-shaped hand-accommodating units  60  and  62  are located adjacent to shoe-shaped shoe-accommodating units  50  and  52 . 
   A layer of insulation  70  is located in interior volume  40 . 
   A plurality of fluid-containing coils, such as coil  80 , are located in interior volume  40 . Fluid, such as oil or the like is contained in the coils. 
   An electrical heating coil, such as heating coil  82 , is wrapped around each fluid-containing coil  80  to be in heat transferring relationship therewith. 
   A switch  86  is located on second layer  30  of base pad  12  and has an “on” position  88  and an “off” position  90  and can be a rheostat-type switch so various levels of power can be transferred through the switch  86  according to the setting of the switch  86 . Switch  86  is electrically connected to each heating coil  82 . Switch  86  is of the type known to those skilled in the circuitry art and since the exact details of the electric circuit associated with device  10  are not important to the present invention, such details will not be discussed in detail. 
   A power cord  94  is electrically connected to switch  86  to transfer electric power from a source (not shown) to each heating coil  82  to activate each heating coil  82  when the switch  86  is in the “on” position  88 . Each heating coil  82  generates heat when activated with the heat generated being transferred to the fluid-containing coil  80  associated therewith and heating fluid contained in the associated fluid-containing coil  80 . 
   Each fluid-containing coil  80  is in heat transferring relationship with the hand-shaped hand-accommodating units  60 ,  62  and the shoe-shaped shoe-accommodating units  50 ,  52  to transfer heat thereto when desired. 
   Operation of device  10  can be understood from the teaching of the foregoing disclosure and thus will not be presented in detail. If a user desires to warm his or her hands, he or she places his or her hands into the hand-shaped hand-accommodating units  60 ,  62  after activating switch  86 . If a user desires to warm his or her feet, he or she places his or her feet into the shoe-shaped shoe-accommodating units  50 ,  52  after activating the switch  86 . The user&#39;s hands and feet can be warmed at the same time if desired. 
   It is understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangements of parts described and shown.