Abstract:
A float switch and mounting bracket assembly made from plastic and impervious to corrosion, with improvements over the prior art including a wide float switch body for enhanced water displacement that results in a more responsive operation, a housing that protects its float switch body from malfunction due to airborne debris, three oversized thumbscrews to facilitate and expedite installation, optional crushable friction points within the top of the mounting bracket slot that stabilize the orientation of the bracket after installation, and longer lead wires and a higher voltage that allow use of the present invention assembly in a wide variety of condensate collection and other applications, and also with structural improvements that minimize air hole clogging and provide increased housing strength as well as manufacturing advantages.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS  
       [0001]     This application is a continuation-in-part of still pending U.S. Ser. No. 10/932,967 filed by the same inventor for substantially the same subject matter on Sep. 2, 2004, with improvements over the invention disclosed in parent application of Ser. No. 10/932,967 that include upper surface structural changes that make its air hole is less likely to clog with water/debris, as well as a housing that is structurally stronger to better protect the float and to provide manufacturing advantage. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     This invention relates to liquid-level float switches, specifically to a float switch and mounting system assembly of sturdy construction that is primarily contemplated for use in condensate collection applications, but which is also useful in a variety of other applications. The most preferred embodiment of the present invention comprises an adjustable float switch body with the amount of its vertical movement relative to a concentrically positioned shaft being adjustably defined by an upper lock-nut and a disk-shaped bottom stop that are both connected to the shaft, with the float switch body also having a large surface area for enhanced buoyancy and improved responsiveness during operation; a shroud or housing configured and positioned to protect float switch body movement from interference due to airborne debris, with the housing/shroud being closely positioned around the float switch body and having an open bottom end, the housing/shroud also having a threaded central aperture through its top surface configured for aligning the upper end of the shaft as it guides the vertical displacement of the float switch body, and the shroud/housing further having at least one small air vent opening in its top surface that is configured and dimensioned to prevent float switch body malfunction as a result of an airlock created by fluid entering the housing through its open bottom end; a substantially U-shaped mounting bracket with one of its arms depending laterally from one side of the housing, the mounting bracket having an upwardly directed slot configured for being positioned over the upper edge of a vertically-extending support surface, with the other arm of the U-shaped bracket having several horizontally-extending threaded bores therethrough each being configured for the insertion of one thumbscrew used for tightening the bracket against a support surface positioned within its slot, optionally having a plurality of crushable friction points within the top portion of the slot that are configured to conform to uneven surfaces and further stabilize the installed bracket to prevent changes in its orientation that could diminish float switch body function, and further having an upper surface configuration that makes its air hole is less likely to clog with water/debris, as well as a housing that has a configuration that is structurally strong to protect the float with less material cost than would be required with other configurations.  
         [0004]     2. Description of the Related Art  
         [0005]     When air conditioning condensate and other condensates are collected, there is often a risk of overflow or back-up into the system producing it. As a result, liquid-level float switches have been employed with collection pans to shut-off the source of condensate flow when the amount of fluid collected exceeds a predetermined depth. However, currently known float switches are deficient in many ways and thereby subject to malfunction, less responsive operation, more costly installation, and/or unstable installation. First, the collection pans used for condensate collection do not always have a sturdy construction. Therefore, when the upstanding pan wall to which a float switch is attached bends as a result of the switch mounting, the float switch tends to lean in over time and when it does it is no longer mounted in a level orientation, making it less responsive. Further, depending upon the location of the collection pan, a float switch mounted thereto may be at risk for malfunction as a result of airborne debris, such as but not limited to the insulation fibers often encountered in attics where air conditioning system condensing units are located. Also, prior art liquid-level float switches tend to have float switch bodies that wobble relative to the shaft with which they are associated, a condition that can lead to less responsive operation or malfunction. Typically, also, the installation of prior art float switches requires the drilling of at least one hole, which increases installation cost. In addition, some float switches are at risk for premature malfunction as a result of being made from materials that are not completely corrosion-resistant. In contrast, the present invention is made from plastic that is impervious to corrosion. Its float switch body is wider than those of known prior art float switches for greater water displacement, and it contains a shroud/housing that protects its float switch body from malfunction due to airborne debris. In addition, it has three thumbscrews to facilitate and expedite mounting bracket installation, with no drilling required.  
       BRIEF SUMMARY OF THE INVENTION—OBJECTIVES AND ADVANTAGES  
       [0006]     The primary object of the present invention is to provide a float switch and mounting system assembly for use with condensate collection pans to shut-off condensate flow when the amount collected exceeds a predetermined depth. It is also an object of the present invention to provide a float switch and mounting system assembly that has cost-effective construction for widespread distribution and use. It is a further object of the present invention to provide a float switch that is sturdy in construction for responsive and reliable operation. A further object of the present invention to provide a float switch and mounting system assembly designed for prompt and cost effective installation. It is also an object of the present invention to provide a float switch and mounting system assembly that is capable of being securely installed and will remain substantially in its original orientation during its entire period of use. Another object of the present invention is to provide a float switch and mounting system assembly with a design that compensates for insubstantial condensate collection pan construction, to prevent the float switch body from leaning in during use. A further object of this invention is to provide a float switch and mounting system assembly that has a means of self-protection against malfunction due to airborne debris, such as the loose insulation fibers typically encountered in attics with some air conditioning applications. In addition, it is a further object of the present invention to provide a float switch and mounting system assembly that is made from corrosion-resistant materials that resist premature deterioration and malfunction.  
         [0007]     As described herein, properly manufactured and used, the present invention would provide a float switch and mounting system assembly that can be used to shut-off the flow of condensate or other fluid when the amount of it collected in a pan or other container associated with the present invention reaches a predetermined maximum depth. The present invention is typically made from plastic, and thereby impervious to corrosion, which in combination with its sturdy construction avoids premature deterioration. Also, its float switch body is wider than prior art float switches for greater water displacement, and it contains a shroud/housing protects its float switch body from malfunction due to airborne debris, both of which contribute to more responsive and reliable operation than is possible with other prior art float switches capable of fulfilling the same function. In addition, it has three thumbscrews to facilitate and expedite installation, and the amount of vertical float switch body displacement is adjustable, which make the present invention readily adaptable to a wide variety of applications and changing needs. Further, the thumbscrews provided that prevent the need for drilling holes in a support surface make installation of the present invention efficient and cost-effective, and the design of the present invention provides sturdy and cost-effective construction. In addition, installation of the present invention via its slot, thumbscrews, and optional crushable friction points provides for secure connection of the present invention to a support surface, even when the support surface is uneven, with the wide and upwardly-extending mounting bracket slot compensating for weak condensate collection pan construction so as to prevent the float switch body from leaning in during use and potentially becoming less responsive. Also, the housing/shroud protects the float switch body against malfunction due to contact with airborne debris, such as but not limited to the loose insulation fibers that are often encountered in attics during air conditioning applications. Further, it has an upper surface configuration that makes its air hole is less likely to clog, as well as a housing that has a decagon configuration that is structurally strong to protect the float with less material cost than would be required with other housing configurations. Thus, its housing walls could be thinner and still provide adequate float protection.  
         [0008]     Although the description herein provides preferred embodiments of the present invention, it should not be construed as limiting the scope of the present invention float switch and mounting system assembly. For example, variations in the height and diameter of the shaft used; the number of threads used on the upper portion of the shaft for housing/shroud connection; the size, number, configuration and relative spacing of the air vent openings in the upper surface of the housing/shroud; the size, location, number and relative spacing of the thumbscrew openings in the mounting bracket connected to the housing/shroud; the depth and width of the upwardly-extending slot in the U-shaped mounting bracket; the comparative height dimensions of the housing/shroud and the mounting bracket; the relative height dimensions of the float switch body, housing/shroud, and shaft; the configuration and dimension of the housing/shroud as long as it allows for unrestricted vertical float switch body movement without unnecessary material expense; and the perimeter configuration and dimension of the lock-nut used to tighten the shaft to the housing/shroud; in addition to those variations shown and described herein, may be incorporated into the present invention. Thus, the scope of the present invention should be determined by the appended claims and their legal equivalents, rather than being limited to the examples given. 
     
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0009]      FIG. 1  is a perspective front view of the most preferred embodiment of the present invention having a housing/shroud with one visible air vent opening, a vertically-oriented hollow shaft with an upper threaded portion that is secured centrally within the protective housing/shroud by a lock-nut, a float switch body positioned within the housing/shroud concentric to the shaft and guided by the shaft for vertical movement in response to water depth changes, a disk-shaped stop being attached to the lower end of the shaft to prevent the float switch body from moving downwardly below the shaft, and a substantially U-shaped mounting bracket depending from one side of the housing, with the bracket having an upwardly directed slot, and multiple thumbscrews that are used to secure the bracket slot over the top edge of a fluid collection container that is at risk for fluid overflow without an accompanying depth-activated shut-off device.  
         [0010]      FIG. 2  is top view of the most preferred embodiment of the present invention having a housing/shroud with one air vent opening, a vertically-oriented hollow shaft secured in place centrally through the upper surface of the protective housing/shroud by a lock-nut, and a mounting bracket depending from one side of the housing/shroud, with three visible thumbscrews through the side of the mounting bracket remote from the housing/shroud, the thumbscrews being used to secure the mounting bracket to the top edge of a support surface extending through the upwardly directed slot shown in  FIG. 1 .  
         [0011]      FIG. 3  is bottom perspective view of the most preferred embodiment of the present invention having a housing/shroud with a vertically-oriented shaft extending through the housing/shroud with a float switch body concentrically positioned around it, a disk-shaped stop attached to the lower end of the shaft below the float switch body, and a mounting bracket depending from one side of the housing/shroud with three visible thumbscrews that are used to secure the mounting bracket to the upper portion of a support surface extending through the slot.  
         [0012]      FIG. 4  is bottom view of the most preferred embodiment of the present invention.  
         [0013]      FIG. 5  is a side view of the most preferred embodiment of the present invention having a housing/shroud with a U-shaped mounting bracket depending from one of its sides, an upwardly-extending slot within the mounting bracket, a shaft centrally positioned within the housing/shroud, the threaded top portion of the shaft extending above the housing/shroud where it is secured by a lock-nut, a disk-shaped stop attached to the lower end of the shaft that defines the lower boundary of float switch body movement, a float switch body positioned within the housing/shroud and substantially filling it, the float switch body supported concentrically on the shaft above the stop for vertical movement in response to changing water depth in an associated water collection container or pan, and multiple thumbscrews attached through one arm of the U-shaped mounting bracket and extending into the slot for use in securing the bracket to a support surface that has its upper edge also positioned within the slot.  
         [0014]      FIG. 6  is a back view of the U-shaped mounting bracket in the most preferred embodiment of the present invention having the one of its arms remote from the housing/shroud displaying three spaced-apart thumbscrews.  
         [0015]      FIG. 7  is a top perspective view of the most preferred embodiment of the present invention having lateral support members helping to secure the housing/shroud to the U-shaped mounting bracket and the housing/shroud having a decagon configuration.  
         [0016]      FIG. 8  is a side view of the float switch in the most preferred embodiment of the present invention having a float switch body concentrically positioned around the non-threaded lower portion of the shaft, two lock-nuts secured to the threaded upper portion of the shaft with the lower lock-nut providing the upper boundary of float switch body movement, and a disk-shaped stop secured to the bottom end of the shaft providing the lower boundary of float switch body movement. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0017]     While  FIGS. 1-8  show the most preferred embodiment of the present invention, it is to be understood that many variations in the present invention are possible and also considered to be a part of the invention disclosed herein, even though such variations are not specifically mentioned or shown. As a result, a reader should determine the scope of the present invention by the appended claims.  
         [0018]      FIG. 1  shows the most preferred embodiment 2 of the present invention having a protective housing  4  with one air vent opening  14  through its top surface, a vertically-oriented shaft  10  with a top opening  32  and a threaded upper end  34  that is secured centrally through the top surface of protective housing  4  by a lock-nut  12 , and a U-shaped mounting bracket having a first arm  30 , a web  38 , and a second arm  6  with an upwardly-extending slot  16  depending from one of the sides of housing  4 .  FIG. 1  also reveals a float switch body  18  positioned within housing  4  and a disk-shaped stop  22  being attached to the lower end of shaft  10  to define the lower boundary for movement of float switch body  18 . Although  FIG. 1  shows the height dimension of housing  4  as being insufficient to completely cover float switch body  18 , the height dimension of housing  4  is not critical and can be greater or less than that shown in  FIG. 1 , as long as it is sufficiently large to fulfill its primary function of protecting float switch body  18  from malfunction due to interference by airborne debris. As can be clearly seen in  FIG. 8 , but not visible in  FIG. 1 , float switch body  18  is positioned around shaft  10  and concentric to it, being guided for vertical movement within housing  4  between the lower lock-nut  12  and disk-shaped stop  22  by the non-threaded lower portion of shaft  10 , and such movement being in response to changing fluid depth in the collection container or pan (not shown) having its top edge secured within slot  6 . Although only one air vent opening  14  is visible in  FIG. 1  through the top surface of housing  4 , two or more air vent opening  14  can be used through the top surface of housing  4  to prevent airlock and potential malfunction of float switch body  18  as rising water moves upwardly into housing  4  through its open bottom end.  FIG. 1  further shows mounting bracket  30 - 38 - 6  having a greater height dimension than housing  4 , with the surplus height extending upwardly beyond the upper surface of housing  4 . In addition,  FIG. 1  shows the two arms of the U-shaped mounting bracket  30  and  6  being different lengths, with the arm remote from housing  4  being longer and extending below the bottom end of housing  4 . The respective height dimensions of mounting bracket  30 - 38 - 6  and housing  4  are not critical, and either could be greater or less than that shown in  FIG. 1 . However, since mounting bracket  30 - 38 - 6  must have sufficient height dimension to provide a sturdy connection for housing  4  to the upper portion of a fluid collection container or pan, it is contemplated that in most applications the height dimension of mounting bracket  30 - 38 - 6  would not be significantly less than the height dimension of housing  4 . Similarly, the relative lengths of the downwardly-extending arms of the U-shaped mounting bracket  30 - 38 - 6  are not critical, and their lengths can vary relative to one another, as well as relative to housing  4 . However, in many contemplated applications, it is preferred that the length of the arm of mounting bracket  30 - 38 - 6  positioned remotely from housing  4  would be the same length or longer than the length of the arm of mounting bracket  30 - 38 - 6  positioned adjacent to housing  4 , and also preferred that the length of the arms of mounting bracket  30 - 38 - 6  not extend too far below the bottom end of housing  4  without appropriate benefit to reduce manufacturing cost. Similarly, while the thickness/width dimensions of the arms of mounting bracket  30 - 38 - 6  and slot  16  are not critical, they must be properly dimensioned to achieve a sustained stable positioning of housing  4  during its use without unnecessary material expense. Further, on the arm of mounting bracket  30 - 38 - 6  positioned remotely from housing  4 ,  FIG. 1  shows two thumbscrews  8  that are used to secure mounting bracket  30 - 38 - 6  in an operable position over the top edge of an upstanding support structure, such as but not limited to the vertically-extending fluid collection pan wall  24  shown in  FIG. 6 . As shown in  FIGS. 2 and 3 , the use of three pressure  11  screws  8  is preferred, however, the number of thumbscrews  8  used, as well as their size and positioning, are not critical as long as secure attachment of mounting bracket  30 - 38 - 6  to the support surface is achieved so as to indefinitely sustain housing  4  in its original level orientation without unneeded material expense.  FIG. 6  shows the preferred configuration and pattern of placement for the openings  28  through the arm of mounting bracket  30 - 38 - 6  positioned remotely from housing  4  that are used to receive the three thumbscrews  8 . In addition,  FIG. 1  shows one crushable friction point  26  within the upper end of slot  16  that is used to further secure the attachment between mounting bracket  30 - 38 - 6  and the support surface positioned in part within slot  6 , such as but not limited to the vertically-extending fluid collection pan wall  24  shown in  FIG. 7 . Multiple spaced-apart crushable friction points  26  are contemplated in the present invention, although not shown, on the upper inside surface of the arm of mounting bracket  30 - 38 - 6  positioned remotely from housing  4 . The use of multiple spaced-apart crushable friction points  26  on the upper inside surface of the arm of mounting bracket  30 - 38 - 6  positioned adjacent to housing  4  is also contemplated, but not critical. Although not shown in  FIG. 1 , the upper end of shaft  10  has a pair of lead wires  30  extending upwardly from the top opening  32  in shaft  10 . When lead wires  30  are connected into the circuit of the system generating the fluid to be collected in the container or pan to which the present invention mounting device  6  is attached, rising fluid in the container or pan will cause the present invention float switch body  18  to similarly rise, and when the depth of the fluid reaches a pre-determined height, the system&#39;s circuit will either be interrupted or completed so as to suspend the generation of additional fluid. Although not shown, for favorable installation and use in new applications, it is contemplated for lead wires  30  to be longer than wires typically provided in prior art float switches and for float switch body  18  to have higher amperage than prior art float switches.  
         [0019]      FIG. 2  shows the most preferred embodiment 2 of the present invention having a decagon-shaped housing  4  with one air vent opening  14  visible through its top surface, a vertically-oriented shaft  10  with and top opening  32  secured in place centrally through the top surface of protective housing  4  by a lock-nut  12 , and mounting bracket  30 - 38 - 6  depending laterally outward from one of the sides of housing  4 . The decagon shape gives housing  4  more strength and thereby housing  4  requires less material cost for the same protection of float switch body  18 . The angled decagon shape of the upper surface of housing  4  allows one vent opening to be used, as clogging is minimized.  FIG. 2  also shows three thumbscrews  8  connected to mounting bracket  30 - 38 - 6  in a position remote from housing  4  that are used to secure mounting bracket  30 - 38 - 6  to a support surface, such as but not limited to the top edge of the upstanding wall of collection pan  24  shown in  FIG. 7 . The number of thumbscrews  8  used is not critical as long as a sufficient number are used for secure positioning of mounting bracket  30 - 38 - 6  and unnecessary material expense is avoided. The three thumbscrews  8  in  FIG. 2  are shown to be oversized relative to mounting bracket  30 - 38 - 6 , although not limited thereto. However, it is preferred that thumbscrews  8  be sufficiently large for easy and confident manipulation by an adult human hand. Although  FIG. 2  shows shaft  10  having a hollow top opening  32 , the lead wires  30  that would typically extend from top opening  32  have been omitted for clarity of illustration. The positioning of air vent opening  14  relative to one another, and to housing  4 , can be different from that shown in  FIG. 2 . Also, the size and configuration of air vent opening  14  can be different from that shown in  FIG. 2 , as long as in combination the air vent opening  14  used prevents airlock within housing  4  and such air vent opening  14  are not so large as to allow the entrance of a significant quantity of airborne debris into housing  4 . Further, although  FIG. 2  shows housing  4 , mounting bracket  30 - 38 - 6 , and the enlarged distal ends of thumbscrews  8  having no surface texture, it is contemplated for each to have any texture or decorative enhancement that does not interfere with its function. Openings  40  between housing  4  and first arm  30  reduce material cost, and the lateral support members  36  being attached between top surface  38  of the U-shaped bracket  30 - 38 - 6  and the first arm  30  also strengthen the attachment of housing  4  to U-shaped bracket  30 - 38 - 6 .  
         [0020]      FIG. 3  shows the most preferred embodiment 2 of the present invention having a protective housing  4  with an open bottom end through which the one air vent opening  14  through the inside top surface of housing  4  are viewed. A shaft  10  is centrally positioned within housing  4 , with a float switch body  18  also being positioned within housing  4  concentrically around shaft  10 . A disk-shaped stop  22  is attached to the lower end of shaft  10 , below float switch body  18  to function as a lower boundary for float switch body  18  movement.  FIGS. 3 and 4  further show a mounting bracket  30 - 38 - 6  depending laterally outward from one of the sides of housing  4 . Three thumbscrews  8  extend through the arm of the substantially U-shaped mounting bracket  30 - 38 - 6  remote from housing  4  and into slot  16 . In spaced-apart positions between thumbscrews  8 ,  FIGS. 3 and 4  show several crushable friction points  26  that are used for additional enhancement of a non-slip connection between mounting bracket  30 - 38 - 6  and its support surface, such as but not limited to the upstanding wall of the collection pan shown in  FIG. 7 . Also in  FIGS. 3 and 4 , the manipulated ends of the thumbscrews  8  appear large relative to mounting bracket  30 - 38 - 6 , with the large configuration being preferred to facilitate ease of use. It is not contemplated for the number of thumbscrews  8  or air vent openings  14  in the present invention to be limited to that shown in  FIG. 3 .  
         [0021]      FIG. 5  shows the most preferred embodiment 2 of the present invention having a housing  4  with a mounting bracket  30 - 38 - 6  that in part extends above and below housing  4 . Housing  4  substantially covers float switch body  18  to keep airborne debris (not shown) from preventing its proper function. Since it is contemplated for the upper portion of a fluid collection pan or other upstanding support surface to be inserted into slot  16  and for the thumbscrews  8  to each be advanced toward slot  16  until it firmly engages the support surface and provides a secure connection between the support surface and mounting bracket  30 - 38 - 6 , the height dimensions of housing  4  and the arms of U-shaped mounting bracket  30 - 38 - 6  are not critical or limited to that shown in  FIG. 5 . Further,  FIG. 5  shows the disk-shaped stop  22  being secured to the lower end of shaft  10 . By raising and lowering stop  22  relative to shaft  10 , stop  22  can be used as a means of adjusting the maximum vertical displacement of float switch body  18  according to a specific application or need. In the alternative, although not shown, a second stop  22  with the same or different thickness dimension could be used in addition to, or in place of the stop  22  shown in  FIG. 5 , as an alternative means of vertical displacement adjustment.  FIG. 5  further shows the threaded top surface  34  of the shaft  10  extending above housing  4  where it is secured by a lock-nut  12 , float switch body  18  substantially filling the interior space within housing  4 , the float switch body  18  being supported concentrically on shaft  10  above stop  22 , one crushable friction point  26  positioned against the upper rear interior surface of slot  6 , and lead wires  30  extending upwardly through the top opening  32  in shaft  10 .  
         [0022]      FIG. 5  shows the most preferred embodiment of the present invention having a housing  4  with a threaded central bore  20  that is configured for vertical insertion of the upper threaded surface  34  of a shaft  10 . Two lock-nuts  12  are used to secure shaft  10  centrally within housing  4 , and a disk-shaped stop  22  is attached to the bottom end of shaft  10 .  FIG. 5  further shows a float switch body  18  concentrically positioned around shaft  10  for free longitudinal movement along shaft  10 , with lock-nuts  12  defining the upper boundary of float switch body  18  movement and stop  22  defining the lower boundary of float switch body  18  movement. The mounting bracket  30 - 38 - 6  depending from one of the sides of housing  4  has an inverted U-shaped configuration and an upwardly directed slot  16  into which the upper portion of a support surface (not shown) would be inserted during use. Three thumbscrews  8  are used for securely positioning mounting bracket  30 - 38 - 6  so that the float switch body  18  within housing  4  can operate without wobbling or other interference that could adversely affect its function. Although  FIG. 5  shows the upper surface of mounting bracket  30 - 38 - 6  extending above the top surface of housing  4 , the relative sizes of housing  4  and mounting bracket  30 - 38 - 6  are not critical as long as each is sufficiently large to fulfill its intended function without undue material waste.  
         [0023]      FIG. 6  shows the exterior surface of the second arm  6  of the most preferred mounting bracket  30 - 38 - 6  of the present invention that is remotely positioned from housing  4 . Three spaced-apart threaded thumbscrews  8  are positioned so as to extend outwardly from second arm  6 . Although not shown, the use, number, size, positioning, spacing, and configuration of crushable friction points are not critical, as long as crushable friction points fulfill their support surface gripping function. The number, size, positioning, spacing, and configuration of threaded openings (not shown) used for thumbscrews  8  are also not critical, as long as they permit the thumbscrews  8  they support to firmly grip the support surface to which mounting bracket  30 - 38 - 6  is attached. Also, the thickness dimension for the arms of U-shaped mounting bracket  30 - 38 - 6  shown in  FIG. 6  is not meant to be limiting.  
         [0024]      FIG. 7  shows the most preferred embodiment of the present invention having mounting bracket  30 - 38 - 6  attached to a decagon-shaped housing  4 , with one vent opening through its top surface. A float switch (shown in  FIG. 8 ) is secured within housing  4  with lock-nut  12 . The angle of the top of housing  4  prevents vent opening  14  from clogging.  
         [0025]      FIG. 8  shows the most preferred embodiment of the present invention float switch having a shaft  10  with a threaded upper threaded surface  34 . Two lock-nuts  12  are used to secure shaft  10  centrally within housing  4 , and a disk-shaped stop  22  (shown in  FIG. 6 ) is attached to the bottom end of shaft  10 .  FIG. 8  further shows a float switch body  18  concentrically positioned around shaft  10  for free longitudinal movement along shaft  10 , with lock-nuts  12  defining the upper boundary of float switch body  18  movement and stop  22  defining the lower boundary of float switch body  18  movement.  
         [0026]     The materials from which the most preferred embodiment 2 is made can vary, but must be impervious to corrosion. Preferably for cost considerations, although not limited thereto, it is contemplated for housing  4 , float switch body  18 , stop  22 , mounting bracket  30 - 38 - 6 , thumbscrews  8 , shaft  10 , and lock-nuts  12  to all be made from plastic. Resistance to UV radiation is not necessarily a contemplated feature of the present invention, unless dictated by the application. Manufacture of the present invention could be accomplished by blow molding, injection molding, assembly of pre-formed individual components, or a combination thereof, with the choice of manufacturing being determined by the anticipated purchase cost to consumers and the expected duration of use without maintenance, parts replacement, or repair. Although size of the present invention is not critical, for many condensate collection applications, the length, width, and height dimensions of the combined housing  4  and mounting bracket  30 - 38 - 6  would be less than two inches, and in some applications a housing  4  width would be no larger than one-and-one-fourth inches. It is also contemplated for the most preferred embodiments of the present invention to have a minimum switching capacity of approximately three Amps., instead of the one-and-one-half Amp. or less switching capacity used by prior art float switches (not shown), and for lead wires  30  to be at least eight feet in length.  
         [0027]     Prior to use of the most preferred embodiment of the present invention, float switch body  18  would be positioned on shaft  10  so that lead wires  30  extend through top end  32 . Preferably, the upper threaded portion  34  of shaft  10  would then be inserted through threaded central bore  20  and secured to the top surface of housing  4  with the two lock-nuts  12  so that the remainder of shaft  10  is vertically extending through housing  4  with float switch body  18  substantially filling the interior space within housing  4 . Stop  22  would be fixed to the bottom end of shaft  10  to define the lower boundary of float switch body  18  movement vertically along shaft  10  during use. Coarse adjustment of the needed vertical displacement of float switch body  18  would be accomplished by repositioning stop  22 , lock-nuts  12 , or both, on shaft  10 . Housing  4  may completely, or only substantially, cover float switch body  18 . To facilitate installation, it is contemplated that mounting bracket  30 - 38 - 6  would already be attached to housing  4 , with thumbscrews  8  already attached to mounting bracket  30 - 38 - 6 . Thus, it is contemplated that all an operator/installer would have to do is place slot  16  over the top edge of the upstanding wall of a condensate collection container or pan  24 , such as but not limited to the container or pan  24  shown in  FIG. 7 , so that crushable friction points  26  engage a portion of container or pan  24 . Thumbscrews  8 , would then be tightened to further secure mounting bracket  30 - 38 - 6  against the upstanding wall of collection container or pan  24  to stabilize the positioning of housing  4  during use for reliable vertical movement of float switch body  18  within housing  4 . No drilling of holes through the upstanding wall of container or pan  24  is required. Once housing  4  is in its secured and usable position, the installer or operator would check it for the stable and level positioning required for reliable and uninhibited vertical movement of float switch body  18 . Lead wires  30  would then be connected to the system providing water or other fluid collected by container or pan  24 . Then, when collected fluid fills container or pan  24  beyond a pre-determined depth that is considered to be safe to prevent overflow, the present invention float switch body  18  is lifted by the rising fluid to the height that interrupts the system&#39;s operation and stop additional fluid collection in container or pan  24 . As fluid rises in container or pan  24 , air vent opening  14  through the top surface of housing  4  prevent the creation of an airlock within housing  4  that could potentially interfere with the proper vertical movement of float switch body  18 . Minimal maintenance is contemplated. Housing  4  would protect the movement of float switch body  18  from interference due to airborne debris (not shown), such as the fibers found in attic insulation. If housing  4  is made from translucent, transparent, or partially transparent materials, an operator could visibly assess the effective operation of float switch body  18  without removing it from housing  4  or separating mounting bracket  30 - 38 - 6  from container or pan  24 . The size, configuration, and pattern of air vent opening  14  and thumbscrews  8  are not critical and can vary depending upon design and price point considerations, such as but not limited to ease of manufacture and effectiveness of operation. It is further contemplated for housing  4  and thumbscrews  8  to have a compact design and construction for efficient packaging and transport.