Abstract:
A sensor and alarm system is associated with a furnace and includes alarm units that can be remotely located from the furnace. The alarm units can signal when the furnace is malfunctioning and can generate alarm signals in a plurality of modes.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to the general art of furnaces, and to the particular field of sensors and alarms associated with furnaces.  
           [0003]    2. Discussion of the Related Art  
           [0004]    Many climates experience periods of weather wherein ambient temperature is below, sometimes substantially below, freezing for some time, and in some cases, extended periods of time. Structures, such as homes or the like located in such climates are subject to these sub-freezing temperatures. These structures are generally insulated accordingly.  
           [0005]    Most structures of the type mentioned above also include water pipes as well as other fluid-containing elements. Should such fluid-containing elements be exposed to sub-freezing temperatures for extended times, fluid in the elements may freeze. As is well understood, if fluid in a fluid-containing element freezes, that element may rupture. A ruptured fluid-containing element can be disastrous for a home owner or for anyone in the structure.  
           [0006]    While many fluid-containing elements are located inside a heated structure, should the heating system in the structure fail, the temperature inside the structure may fall to sub-freezing levels after a time.  
           [0007]    While fluid-containing elements, such as water pipes, have been mentioned above, those skilled in the art will recognize that there are other temperature-sensitive items and elements that are located in a structure such as a house that may be damaged by exposure to low temperatures.  
           [0008]    Therefore, there is a need for a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure.  
           [0009]    While the inventor is aware of devices that will automatically shut off a furnace under certain conditions, such as loss of a pilot light, the inventor is not aware of any system that will alert someone that a furnace has malfunctioned in a manner which may create a condition in which ambient temperature in a structure, such as a residence, may be in danger of falling below a preset temperature.  
           [0010]    In order to ensure that the proper person is alerted, any alarm associated with the above-discussed system should be located in a position most likely to alert the proper personnel.  
           [0011]    While a location immediately adjacent to a furnace is an effective location for a sensor, this is generally not the most effective location for an alarm since many furnaces are located in remote areas of a structure. For example, a non-resident property owner may be the most effective person to alert if a furnace is malfunctioning. Furthermore, if a homeowner has a neighbor look in on his home to monitor the furnace while the homeowner is away for an extended period of time, that monitor will not be present on the premises for extended periods of time. Since water damage caused by ruptured pipes is so devastating and can occur quite rapidly, it will do little good if a person&#39;s home is being monitored by someone else and a significant amount of time elapses between checks of the home and a water pipe ruptures during such time lapse.  
           [0012]    Still further, while being spaced immediately adjacent to a furnace is an effective location for a sensor, sensors could also be located near those elements that are most sensitive to ambient temperature as well.  
           [0013]    Therefore, there is a need for a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure and which has elements thereof that can be positioned in the most effective location.  
           [0014]    Still further, while many alarms from condition-monitoring systems are audible, to be most effective an alarm should utilize as many modes as reasonably possible.  
           [0015]    Therefore, there is a need for a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure which can use a plurality of alarm signal modes.  
           [0016]    In some cases, a furnace will fail long before the temperature in a location remote from the furnace noticeably falls. Thus, for example, in an office building, those on upper floors may not notice a falling temperature in the environment around them for some time after a furnace fails. However, if those people could be warned well ahead of the time they notice the falling ambient temperature, those people may be able to take proper actions, such as notifying the proper personnel, protecting temperature sensitive equipment or the like. Such early warning may save time and expense in many instances.  
           [0017]    Therefore, there is a need for a system which can be used as an early warning system to warn that a furnace is not properly functioning and ambient temperature in locations remote from the furnace is in danger of falling below a pre-set level.  
         PRINCIPAL OBJECTS OF THE INVENTION  
         [0018]    It is a main object of the present invention to provide a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure.  
           [0019]    It is another object of the present invention to provide a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure and which has elements thereof that can be positioned in the most effective location.  
           [0020]    It is another object of the present invention to provide a system which can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure which can use a plurality of alarm signal modes.  
           [0021]    It is another object of the present invention to provide a system which can be used as an early warning system to warn that a furnace is not properly functioning and ambient temperature in locations remote from the furnace is in danger of falling.  
         SUMMARY OF THE INVENTION  
         [0022]    These, and other, objects are achieved by a furnace sensor and alarm system which includes a temperature sensor located near a furnace to detect the temperature near the furnace and an alarm system located remotely from the furnace which will generate alarm signals in a plurality of modes and at a plurality of locations when temperature falling below a pre-set level is sensed by the temperature sensor.  
           [0023]    The system embodying the present invention thus can be used to prevent ambient temperature in a structure, such as a house, from falling below a level which would create a condition in which temperature-sensitive devices in the structure may be damaged due to the ambient temperature in the structure. The system also can have an alarm signal that has a high likelihood of being noticed by someone who is most likely to take corrective action, and can be used as an early warning that ambient temperature is in danger of falling below a predetermined level unless corrective action is taken. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES  
       [0024]    [0024]FIG. 1 shows a structure containing the system embodying the present invention.  
         [0025]    [0025]FIG. 2 shows the system embodying the present invention.  
         [0026]    [0026]FIG. 3 is a perspective view of an alarm signal generator used in the system of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0027]    Other objects, features and advantages of the invention will become apparent from a consideration of the following detailed description and the accompanying drawings.  
         [0028]    Referring to the figures, it can be understood that the present invention is embodied in a furnace sensor and alarm system  10  that can be used to monitor the operation of a furnace and to effectively alert the personnel that will be most likely to take action to correct any malfunction in the furnace. System  10  includes a furnace  12  which generates heated air. A heated air exit  14  is fluidically connected to the furnace. Heated air exit  14  can be a convector or the like and can be located in any suitable location in building  16 . While only one heated air exit is shown in FIG. 1, those skilled in the art will understand that a building can contain a multiplicity of such air exits.  
         [0029]    A sensor  20  is mounted on a support surface, such as wall  22 , near the heated air exit or near the furnace as indicated as sensor  22 ′, or at any other suitable location, such as near a temperature-sensitive element as indicated by sensor  24  located near a fluid-containing element, such as water pipe  26 . A heat sensor  28  can also be located inside the furnace  12  immediately adjacent to the heat generating element or elements of the furnace. Those skilled in the art will understand that the sensors can be located throughout the building as suitable.  
         [0030]    It is noted that if sensor  28  is used, an early warning can be obtained that the furnace  12  is not working. Those in the remainder of the building may still be experiencing proper ambient temperature when the furnace  12  fails; however, this situation will not continue as the temperature will fall because the furnace  12  is malfunctioning. However, the sensor  28  will sense the furnace  12  malfunction before ambient temperature in a remote room noticeably falls so the proper personnel can take appropriate action to prevent the ambient temperatures in locations remote from the furnace  12  from falling or to protect the people or equipment or the like in such remote locations from low temperatures.  
         [0031]    Each of the sensors includes a temperature sensing element  32 , such as a thermocouple or the like, a signal generator  34 , such as an alarm circuit or the like in the temperature sensing element  32  which generates an alarm signal when the temperature sensing element  32  senses a temperature below a pre-set level. An alarm circuit  36  is connected to the signal generator  34  of the temperature sensing element  32  to receive an alarm signal from the signal generator  34  and to be activated by the alarm signal received therefrom. A temperature level-setting circuit  38  is connected to the temperature sensing element  32  to control the pre-set level at which the alarm signal is generated.  
         [0032]    It is noted that the details of the particular elements indicated by boxes in FIG. 2 are not part of the invention and any off-the-shelf item can be used for the temperature sensing element  32 , the signal generator  34 , the alarm circuit  36  and/or the temperature level-setting circuit  38 . Accordingly, the details of such elements will not be described in detail.  
         [0033]    A first remote alarm unit  40  is located remote from the furnace  12 . The alarm unit  40  can be positioned in a stairwell  42  or any other suitable location on the premises. The alarm unit can also be located off the premises as indicated for alarm  40 ′. Alarm  40 ′ can be located in a non-resident manager&#39;s office or in the home of a person taking care of building  16 , or the like. The alarm unit is electrically connected to the alarm circuit of the sensor by landlines, such as electrical connectors  43  and  43 ′, to receive an alarm signal from the alarm circuit  36 . Each of the remote alarm units includes a housing  50  which has a removable cover  52  with a speaker cover  54  therein.  
         [0034]    An audible signal generator  56 , such as a sound chip, a speaker or the like is located inside the housing  50  near the speaker cover  54  so sound generated by the generator  56  can be heard outside the housing  50 . The details of the sound generator  56  will be understood by those skilled in the art and the particular details of the sound generator  56  do not form a part of the invention and thus will not be described in detail.  
         [0035]    A visual signal generator  58  can also be located on the housing  50 . The visual signal generator  58  can include a flashing light or a light that changes color when an alarm signal is received. As is the case with the sound generator  56 , the details of the visual signal generator  58  will be understood by those skilled in the art and the particular details of the visual signal generator  58  do not form a part of the invention and thus will not be described.  
         [0036]    An on/off control  60  is also located on each alarm unit so the alarm signal can be manually deactivated. System  10  can be powered from utility power connected to the premises being monitored by a power cord  62 , or can be connected to an emergency power source P by a power cord  62 ′.  
         [0037]    It is also noted that while the present invention has been disclosed in connection with a heating system, the system embodying the present invention can also be used in connection with a cooling system as well. The temperature sensors can be set so an alarm signal is generated when temperature rises to a pre-set level or when a cooling unit fails. Those skilled in the art will understand how the system embodying the present invention can be used in connection with a cooling system based on the teaching of the present disclosure.  
         [0038]    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.