Patent Abstract:
A self-contained handheld drain clearing device is provided that uses compressed air to unblock various household drains and pipes. The device comprises an upper body and a lower body. The upper body includes a cylindrical chamber for housing a manual pump. A one-way inlet valve allows compressed air to enter a collection chamber, from which it exits to a storage chamber through a small hole in a piston. A trigger component is located in the upper body of the device, as is a pressure release safety component included for user protection. The lower body of the device primarily serves as a storage area for compressed air, containing an upper end and a lower end. The upper end contains threads for joining the lower body with the upper body, while the lower end contains a fitting for receiving various drain-sealing adapters.

Full Description:
FIELD OF THE INVENTION 
   This invention relates to the field of drain clearing devices. More specifically, this patent deals with a self-contained handheld device that provides a burst of user generated compressed air to unblock household drainage pipes, surface drains, tubs, basins, sinks, and toilets. 
   BACKGROUND OF THE INVENTION 
   The blockage of drains and pipes is an occurrence that affects millions of households per year. If not immediately cleared, a blockage could lead to a build up of septic and or putrid water in and around the house. Such a condition can often be remedied by the use of chemicals. However, chemicals are not reusable, can be harmful to the environment, present a potential danger to people that are exposed to or accidentally ingest them, and can corrode the pipes in which they are poured. The services of a professional plumber can be utilized as an alternative to drain clearing chemicals. While the use of a plumber would assuredly eliminate the blockage, it is significantly more expensive. The use of handheld devices is the remaining option to clear a clogged drain or pipe. 
   A conventional plunger, comprising a rubber suction cup attached to the end of a wooden or metal handle, is the primary handheld device used for clearing clogged drains and pipes. To operate, the suction cup is placed over the clogged area and the user forces the handle up and down causing the suction cup to create a suction force over the clogged area. This force either sucks or pushes the clogged material free, clearing the pipe or drain. Although plungers are generally inexpensive, there are several drawbacks to their use. First, they can require a significant amount of energy and patience to clear the blockage. There can only be a limited amount of force generated by the suction cup, and this force cannot be maintained over great lengths to remove any remote clogs. Thus, a user must continuously and vigorously move the handle up and down to create any significant amount of force. Second, using a plunger can lead to a messy situation, as splashing of water and material can occur if the plunger is not properly sealed to the drain or pipe. Third, the use of a plunger can be inefficient and ineffective if the suction cup does not properly fit over the drain or pipe, as the suction force will not be as great. Finally, plungers can be bulky and difficult to conveniently store. 
   Many drain clearing devices that try to eliminate one or more of the drawbacks of the standard plunger have been invented and patented. Pertinent prior art directed towards these drain clearing devices can be found in U.S. Pat. No. 4,629,128 (Lawrence), U.S. Pat. No. 5,199,114 (Christopher), U.S. Pat. No. 5,669,099 (Porcasi), U.S. Pat. No. 5,940,897 (James), U.S. Pat. No. 6,526,601 (Kou Hsiao), and U.S. Pat. No. 6,550,074 (Allenbaugh et al.), all incorporated by reference herein. 
   U.S. Pat. No. 5,199,114 describes a drain clearing device having a transparent and hollow cylindrical body, a piston plunger assembly partially disposed in the cylindrical body, a piston plunger assembly support attached to an upper end of the cylindrical body, and a drain seal attached to a lower end of the cylindrical body. The preferred embodiment of the drain seal comprises a half doughnut-shaped drain seal head formed from medium density, closed cell sponge rubber, a drain seal head bearing plate fixedly attached to the drain seal head, and a drain seal neck fixedly attached to the drain seal head bearing plate. The drain seal neck attaches to the cylindrical body in sealing engagement. 
   While this invention is an improvement over the standard plunger device in that it provides a means for observing when clogged debris are removed from the drain or pipe and provides better sealing, it still has shortcomings. This device does not provide for a variety of drain-sealing adapters that can be used to fit various drains or pipes. Additionally, a user must either rapidly move the handle up and down or continue moving the handle up and down for a prolonged period to create the amount of force necessary clear a large amount of clogged material. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   The invention patented in U.S. Pat. No. 5,940,897 involves a plunger having a handle, an upper cylinder, a lower cylinder, and a nozzle. The bottom portion of the upper cylinder fits over the top portion of the lower cylinder. The handle may be grasped to push the upper cylinder down over the lower cylinder to force compressed air out through the nozzle, or to pull the upper cylinder up to create a vacuum to suck air and/or fluids up. A disc shaped piston compresses the air inside the lower cylinder when the upper cylinder to which the piston is attached moves down, and creates a partial vacuum when it moves up. The piston is attached by a rod to the handle and the upper cylinder. A spring in the space between the upper and lower cylinders biases the upper cylinder towards a set position with respect to the lower cylinder, and resists movement either upward or downward from the set position. Through the center of the nozzle is an aperture, through which air and fluids may move. The sides of the aperture are formed by an inner ring, which is surrounded by a circular cavity that separates the inner ring from an outer ring. 
   This patent additionally relies on an up and down pumping action to clear clogged material. While an improvement over the standard plunger, this invention does not provide for a quick, pressurized burst of air that can rapidly clear drains or pipes. Additionally, the design of the nozzle limits the types of drains or pipes that can cleared with this device. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   U.S. Pat. No. 6,526,601 provides a drain cleaner which comprises a casing having an aperture defined in a first end thereof and a tube that is engaged with the opening. A high pressure can is received in the casing and includes a valve which is located in alignment with a shrink opening of the tube. A spring is connected between the can and an inside of the first end of the casing. A rod movably extends through a second end of the casing is pushed to move the can to generate a high pressure through the tube. 
   This patent utilizes a pressurized can to clear clogged pipes and drains. Although this invention is an improvement over the previously described devices in that it requires less effort by a user to clear a blockage, it does not offer a device that can be reused without the purchase of additional items. When the pressurized contents of a can are emptied the user must purchase a new can to unblock future clogged areas, leading to increased costs and time expended. Additionally, the user is limited in the type of blockage that can be cleared by the amount of pressure that each can possesses. Further, this invention does not allow the user to adapt the device to fit a variety of drains or pipes. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   The plumbing device described in U.S. Pat. No. 6,550,074 uses a compressed gas and a burst disk having a relatively even surface of substantially uniform thickness to produce a sudden discharge of energy to forcibly act against any obstruction that may interfere with the proper function of a drain. The plumbing device has a cylindrical chamber for receiving the compressed gas and may generally take the shape of a plunger, which is flexible to use and is easy to store. A portion of the chamber forms a receiving chamber with the burst disk for harnessing and directing the energy of the compressed gas to clear the drain. 
   This invention additionally uses a burst of compressed air to clear blockages. The device cannot be continuously used without dismantling however. After each use, the burst disk must be replaced by detaching the lower chamber from the upper chamber and placing a new disk above a washer secured to the lower chamber. Similarly, a new compressed air canister must be purchased and installed when the existing canister becomes empty. This not only adds increased costs, but also increased time and effort to use the device. Additionally, the amount of pressure that is delivered to the clogged area is not easily variable, but dependent upon the thickness of the burst disk used. For greater pressure released, either a thicker burst disk must be purchased and used or multiple thinner burst disks must be stacked together. Further, a user must stand and use both hands to operate this device, complicating and preventing its use in tight areas. Finally, this device is not easily adaptable to different sized drains or pipes, creating a scenario that is potentially conducive to inefficient and ineffective results. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   U.S. Pat. No. 5,669,099 discloses a new and improved hand-held drain cleaning system employing pressurized air to dislodge clogs from a drain. The system includes a main housing defined by a handle component and a minor housing component. The handle component includes a rod and piston for use in delivering compressed air to the minor housing. The device further includes a spring-biased trigger for use in selectively delivering compressed air from the device into a clogged drain. Furthermore, the system includes a plurality of drain closure members of various sizes adapted to fit into various sized drains. 
   This invention utilizes a manual pump to generate compressed air for clearing clogged drains and pipes. Its substantial departure from the prior art lies in its inclusion of a plurality of drain closure members of various sizes adapted to fit into various sized drains. While an improvement, this device is deficient in certain respects. First, the forward portion of the device that stores compressed air has little capacity, either preventing the dislodging of larger blockages, or requiring multiple air bursts to do so. Second, there is no safety feature incorporated into the device to help to prevent unintended damage to the user. Third, the air discharge method employed has the potential to create air leakage after repeated use. A resilient spring is relied upon to rebound the trigger into a position to close the stopper and block air from entering the cylindrical discharge passage. After multiple depressions of the trigger, the spring can become less resilient and cause the formation of a less-tight seal between the stopper and the cylindrical passage. This can result in decreased blockage clearing effectiveness or increased costs for the user in having to purchase replacement parts. Finally, the force of the compressed air pressing the stopper against the cylindrical passage, combined with the resistance given by the resilient spring, can require a great deal of effort to depress the trigger and use the device. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   The invention patented in U.S. Pat. No. 4,629,128 is an apparatus for discharging a high pressure burst of air against a column of standing water behind an obstruction in a drain line to create shockwaves in the water column to remove the obstruction, including a hollow gun body having a discharge opening and a pistol grip handle connected to the gun body. A discharge valve is connected to a piston dividing the interior of the gun body into two chambers, the pressurization and de-pressurization of which is controlled by a trigger operated pilot valve. Air is quickly exhausted from a rearward chamber by depressing the trigger and pilot valve, causing the piston and valve to snap rearward to open the discharge opening and direct a burst of pressurized air from a forward chamber to exit through the discharge opening and into a drain line. 
   This invention requires some type of air supply device, whether it be an air hose or pressurized canister. Additionally, this device does not provide a variety of sealable adapters that can be used to fit various drains and pipes. Further, this device does not incorporate any safety features for user protection. Finally, the discharge of the pressurized air does not occur in a directed and confined manner, potentially eliminating some of the effectiveness in clearing larger blockages. Therefore, it would be highly desireable to have a self-contained and easy to operate handheld device that allows for the rapid, clean, environmentally-safe, cost-effective, and readily repeatable clearing of a variety of clogged drains and pipes. 
   SUMMARY OF THE INVENTION 
   Set forth is a brief summary of the invention in order to solve the aforementioned problems and achieve the foregoing advantages in accordance with the purposes of the present invention as embodied and described herein. 
   The principle advantage of this invention is that it provides a low-cost handheld device that uses compressed air to deliver a directed, high-pressure force to unblock a variety of household drainage pipes, surface drains, tubs, basins, sinks, and toilets. 
   Another advantage of this invention is that it provides a method for unblocking a variety of household drainage pipes, surface drains, tubs, basins, sinks, and toilets that does not use environmentally harmful chemicals. 
   Yet another advantage of this invention is that it provides a device that can quickly and efficiently unblock a variety of household drainage pipes, surface drains, tubs, basins, sinks, and toilets. 
   Still another advantage of this invention is that it provides a drain clearing device that is portable, lightweight, easy to use, and convenient to store. 
   Yet another advantage of this invention is that it provides a drain clearing device that incorporates a pressure release component for user protection. 
   A final advantage of this invention is that it does not involve the purchase of replacement parts, such as burst disks or compressed air canisters, allowing for lower costs and continuous use without dismantling. 
   The present invention provides a new and improved self-contained handheld drain clearing device that uses compressed air to unblock various household drains and pipes. The device comprises an upper body and a lower body. The upper body includes a cylindrical chamber for housing a manual pump. A one-way inlet valve allows compressed air to enter a collection chamber, from which it exits to a storage chamber through a small hole in a piston. A trigger component is located in the upper body of the device, as is a pressure release safety component included for user protection. The lower body of the device primarily serves as a storage area for compressed air, containing an upper end and a lower end. The upper end contains threads for joining the lower body with the upper body, while the lower end contains a fitting for receiving various drain-sealing adapters. 
   With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention. Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of this invention. 
       FIG. 1  depicts a side elevational view of the drain clearing compressed air device, constructed in accordance with the present invention; 
       FIG. 2  depicts a partial cross-sectional view of the drain clearing compressed air device, constructed in accordance with the present invention; 
       FIG. 3  depicts a cross-sectional view of a one-way air inlet valve, constructed in accordance with the present invention; 
       FIG. 4  depicts a cross-sectional view of a first embodiment of the pressure release safety component, constructed in accordance with the present invention; 
       FIG. 5  depicts a cross-sectional view of the trigger component, constructed in accordance with the present invention; 
       FIG. 6  depicts a profile and cross-sectional view of the manual pump, constructed in accordance with the present invention; 
       FIG. 7  depicts a bottom view of the drain-sealing adapter fitting located at the bottom of the lower body of the drain clearing compressed air device, constructed in accordance with the present invention; 
       FIG. 8  depicts a cross-sectional view of a second embodiment of the pressure release safety component, constructed in accordance with the present invention; 
       FIG. 9  depicts a cross-sectional view of a detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks and basins, constructed in accordance with the present invention; 
       FIG. 10  depicts a cross-sectional view of a detachable drain-sealing adapter to be used with the drain clearing compressed air device, in conjunction with the adapter to unclog sinks/basins shown in  FIG. 9 , for unclogging open surface drains, bathtubs, or toilets, constructed in accordance with the present invention; 
       FIG. 11  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks and basins, constructed in accordance with the present invention; 
       FIG. 12  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks and basins, constructed in accordance with the present invention; 
       FIG. 13  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains or bathtubs, constructed in accordance with the present invention; 
       FIG. 14  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains and toilets, constructed in accordance with the present invention; 
       FIG. 15  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks/basins or bathtubs that contain a lift plug, constructed in accordance with the present invention; 
       FIG. 16  depicts a cross-sectional view of another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains, bathtubs, or toilets, constructed in accordance with the present invention; and 
       FIG. 17  depicts a partial cross-sectional view of the drain clearing compressed air device with a drain-sealing adapter, as shown in  FIG. 13 , attached to the drain clearing compressed air device, constructed in accordance with the present invention. 
   

   For a fuller understanding of the nature and advantages of the invention, reference should be had to the following detailed description taken in conjunction with the accompanying drawings which are incorporated in and form a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of this invention. 
   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   For a fuller understanding of the nature and advantages of the invention, reference should be had to the following detailed description taken in conjunction with the accompanying drawings wherein similar parts of the invention are identified by like reference numerals. 
   Referring now to  FIG. 1 , there is shown a side elevational view of the preferred embodiment of the drain clearing compressed air device  10 . A manual pump  30  is used to force compressed air into compressed air storage chamber  14 . A trigger component  60  is used to release compressed air from compressed air storage chamber  14 . Drain-sealing adapter fitting  16  allows drain-sealing adapters to be connected to drain clearing compressed air device  10  to enable the clearing of various pipe and drains. A pressure release safety component  50  is included for user safety. 
   Referring now to  FIG. 2 , there is shown a partial cross-sectional view of the drain clearing compressed air device  10 . Compressed air is forced into a one-way air inlet valve  20  to compressed air collection chamber  24 . As compressed air enters compressed air collection chamber  24 , piston  26  is pushed forward, exposing air outlet hole  28  in piston  26 . Compressed air is forced through air outlet hole  28  or a gap between piston  26  and the surrounding parts, into compressed air storage chamber  14 , where it is stored prior to being released by trigger component  60 . Manual pump  30  is used to force compressed air into one-way inlet valve  20 . Manual pump  30  contains a pump handle  32  attached to a pump rod  34 , as well as a plunger  36  attached to pump rod  34  to assist in forcing compressed air through one-way air inlet valve  20 . Locking ring  38  connects plunger  36  to pump rod  34 . Additionally, an alternate embodiment of the pressure release safety component  80  is shown, in place on the compressed air storage chamber  14 . 
   Referring now to  FIG. 3 , (with reference also to  FIG. 2 ) there is shown a cross-sectional view of the one-way air inlet valve  20 , which is composed of shell  40 , spool  42 , and seal packing ring  44 . One-way air inlet valve  20  ensures that air can only enter through one opening and exit through another. When a user pumps manual pump  30  (as shown in  FIG. 2 ) in a direction towards drain clearing compressed air device  10  (as shown in  FIG. 2 ), compressed air is pushed into air inlet valve  20  (as shown in  FIG. 2 ), forcing spool  42  and seal packing ring  44  into compressed air collection chamber  24  (as shown in  FIG. 2 ). This results in an exposure of an opening from which compressed air can flow into compressed air collection chamber  24  (as shown in  FIG. 2 ). When a user pulls manual pump  30  (as shown in  FIG. 2 ) away from drain clearing compressed air device  10  (as shown in  FIG. 2 ), spool  42  and seal packing ring  44  rebound back into place, preventing air leakage from compressed air collection chamber  24  (as shown in  FIG. 2 ). 
   Referring now to  FIG. 4 , there is shown a cross-sectional view of a first embodiment of the pressure release safety component  50 . An air-tight seal is formed by threaded sealing nut cap  46 , having an orifice  46 A, frangible membrane  48 , and membrane contacted O-ring  47 . The frangible membrane  48  is replaceable, and is inserted onto the O-ring  47  before the cap  46  is threaded tight onto threaded protrusion  49 . Threaded protrusion  49  is in fliud communication with the compressed air within the compressed air storage chamber  14  (see  FIG. 2 ). If compressed air within the compressed air storage chamber  14  exceeds a certain pressure, air is forced through air passage  49 A and breaks the frangible membrane  48 , which allows air to safely escape the compressed air storage chamber  14  through an orifice  46 A located in the threaded sealing nut cap  46 . 
   Referring now to  FIG. 5 , there is shown a cross-sectional view of trigger component  60  used to discharge highly compressed air from compressed air storage chamber  14 . Trigger component  60  is composed of trigger handle  62 , pin  64 , trigger piston  66 , trigger spring  68 , cushion  70 , trigger seal packing ring  72 , and needle valve  74 . Trigger handle  62  is fixed to the upper body of drain clearing compressed air device  10  by pin  64 , and has two positions. In the first position, trigger handle  62  is uncontacted with trigger piston  66 . When trigger handle  62  is in this position the user can use manual pump  30  to build up compressed air. After the user applies an upward force to trigger handle  62 , rotating it about pin  64 , trigger handle  62  is in the second position. In the second position, trigger handle  62  is in contact with and applies a linear force to trigger piston  66 , forcing needle valve  74  and seal packing ring  72  outward into compressed air collection chamber  24 . This action allows compressed air from the compressed air collection chamber  24  to exit through needle valve  74 . During this process, the air pressure suddenly becomes unequal between compressed air collection chamber  24  and compressed air storage chamber  14 , causing piston  26  to quickly rebound and separate from sealing nut cap  46 . Compressed air from compressed air storage chamber  14  then rapidly explodes into and through compressed air output passage  50 , out of drain clearing compressed air device  10 , and down the blocked drain or pipe, creating an immediate increase in water pressure sufficient enough to clear the blockage. 
   Referring now to  FIG. 6 , there is shown a cross-sectional view of manual pump  30 . Pump collar  52  is used to slidably and sealingly position pump rod  34  within drain clearing compressed air device  10 . One end of pump rod  34  is connected to pump handle  32 , and the other end of pump rod  34  is connected to plunger  36  by locking ring  38 . 
   Referring now to  FIG. 7 , there is shown a plan view of drain-sealing adapter fitting  16  of the drain clearing compressed air device  10 . The drain-sealing adapter fitting  16  contains a transverse obstruction  54  to prevent large particles from entering drain clearing compressed air device  10 . 
   Referring now to  FIG. 8 , there is shown a cross-sectional view of an alternate embodiment of the pressure release safety component  80  (as first shown in  FIG. 2 ). Pressure release safety component  80  comprises a safety cover  82 , plug  84 , fine tuner  86 , spring  88 , and jam core  90 . The operating pressure of drain clearing compressed air device  10  is typically between 0.3-0.45 Mpa. The safety pressure of fine tuner  86  is 0.45-0.55 Mpa. Fine tuner  86  adjusts the pressure of spring  88  using a screwing action. When the inner pressure of compressed air storage chamber  14  exceeds the safety pressure of fine tuner  86 , spring  88  cannot be compressed by trigger piston  66 , and jam core  90  will be jammed. Excess pressure is then released from plug  84  and fine tuner  86  to ensure safe usage of drain clearing compressed air device  10 . No adjustments to pressure release safety component  80  are needed since it is manufactured to maintain the required air pressure. 
   Referring now to  FIG. 9  there is depicted a detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks/basins. 
   Referring now to  FIG. 10 , there is depicted a detachable drain-sealing adapter to be used with the drain clearing compressed air device, in conjunction with the adapter to unclog sinks/basins shown in  FIG. 9 , for unclogging open surface drains, bathtubs, or toilets. 
   Referring now to  FIG. 11 , there is shown another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks/basins. 
   Referring now to  FIG. 12 , there is depicted another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks/basins. 
   Referring now to  FIG. 13 , there is depicted another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains or bathtubs. 
   Referring now to  FIG. 14 , there is shown another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains and toilets. 
   Referring now to  FIG. 15 , there is depicted a detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging sinks/basins or bathtubs that contain a lift plug. 
   Referring now to  FIG. 16 , there is shown another detachable drain-sealing adapter to be used with the drain clearing compressed air device for unclogging surface drains, bathtubs, or toilets. 
   Referring now to  FIG. 17 , there is shown a partial cross-sectional view of the drain clearing compressed air device with a drain-sealing adapter, as shown in  FIG. 13 , attached to the drain clearing compressed air device  10  at the drain-sealing adapter fitting  16  (see  FIG. 1 ) located at the lower portion of the compressed air storage chamber  14 . All of the drain-sealing adapters, as shown in  FIGS. 9 through 16  are made of resilient materials and fit into place over the rounded portion of the drain-sealing adapter fitting  16 . 
   The drain clearing compressed air device and the various drain-sealing adapters of the present invention, as shown in the drawings and described in detail, herein discloses an arrangement of elements of particular construction and configuration for illustrating the preferred embodiment of structure and method of operation of the present invention. It is to be understood however, that elements of different construction and configuration and other arrangements thereof, other than those illustrated and described may be employed for providing a drain clearing compressed air device in accordance with the spirit of this invention, and such changes, alternations, and modifications as would occur to those skilled in the art are considered to be within the scope of this invention as broadly defined in the appended claims. 
   Further, the purpose of the foregoing abstract is to enable the United States Patent and Trademark Office, the general public, and especially the scientists, engineers, and practitioners in the art who are not familiar with patent or legal terms or phraseology, to quickly determine the nature and essence of the technical disclosure of the application from a cursory inspection. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.

Technology Classification (CPC): 4