FOUNDATION DRAIN CLEANING APPARATUS AND METHOD

Abstract: This is a new apparatus and method for cleaning debris from the inside of a foundation drain tile, the drain tile being in the immediate proximity of the perimeter of a building structure. A rocket nozzle which is in fluid communication with flexible tubing and a high pressure water supply, and a foot pedal control valve is used for starting and stopping the fluid flow. An opening in the tip of the nozzle enables pressurized water to be discharged through the tip in a forward direction. At least two apertures are disposed along a nozzle recess. The tubing is secured to the nozzle and is in fluid communication with the nozzle. An on-off foot pedal control valve is used to start and stop the water flow into the tubing and into the nozzle. As pressurized water is supplied to the nozzle and projected through the apertures, the nozzle is propelled in a forward direction through the drain tile. The flow of the pressurized water through the nozzle causes the pressurized water to be projected through the opening in the nozzle tip. As the nozzle is propelled through the drain tile, the water flowing through the nozzle tip is continually directed at the debris at sufficient force to separate the debris from the drain. To assist in cleaning the drain tile, a series of cleanout pipes are installed near the juncture of the drain tile and conventional pipes located underneath the basement floor.

Description: FOUNDATION DRAIN CLEANING APPARATUS AND METHOD BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new apparatus and method for cleaning foundation drain tiles located in the immediate proximity of the perimeter of a building structure. 2. Background Art Conventional single and multi-family dwellings and other building structures are typically built upon foundation walls which define the basement area. The foundation walls and the footers are in direct contact with the ground surrounding the home. Most such building structures have a drainage system in the immediate proximity of the foundation which enables water and debris immediately surrounding the building structure and the side walls to drain away therefrom. The drain tile is generally located around the perimeter of the basement slightly below the foundation. The drain tile is water porous, allowing water to enter therein and routed through the drain tile to a sewer or a sump pump. The drain tile is εenerallv located within a bed of water-permeable material such as gravel, the gravel bed surrounding the basement foundation. When the drain tile becomes blocked at various locations with silt and other debris, as frequently occurs, the drain tile is extremely difficult to clean. The drain tile may be interconnected to the eaves wherein leaves and twigs, roof tar, and even the remains of small animals may become lodged in the drain tile. Since the flow of water and debris through the drain tile is at most a trickle, the drain tile never is flushed out. The property owner is confronted with choosing between digging several feet deep into the land surrounding the building structure to access and clean-out the existing drain tile, or inserting a new drain tile under the basement floor and thereby gutting SUBSTITUTE SHEET major portions of the existing basement floor. What is needed is a new method and apparatus for cleaning the existing drain tile that will overcome these disadvantages and will not require a ma.jor upheaval of the grounds surrounding the building structure, or destroying the basement floor. SUMMARY OF THE INVENTION The primary advantage of the apparatus and method of the present invention is that it enables debris to be effectively cleaned from the existing drain tile, while minimizing the damage done to the land around the building structure, the basement floor, and the drain tile. Another advantage of the present invention is that the drain tile may be thoroughly and efficiently cleaned by one operator working alone, and thereafter routinely cleaned and maintained on a regular basis. The cleaning apparatus of the present invention consists of a rocket nozzle in fluid communication with flexible tubing, a high pressure fluid supply, and a foot pedal * for starting and stopping the fluid flow. The rocket nozzle has a head portion and a tail portion. The head portion has ' an opening on the tip thereof through which a pressurized fluid, preferably water, is dischargeable in a forward direction. The tail portion of the nozzle is in fluid communication with a high pressure water supply. The nozzle has a recess between the head portion and the tail portion, the recess having a rearward surface. At least two apertures are disposed along the recess. The flexible tubing and all fittings used therein are capable of withstanding the flow of high pressure water. The tubing is secured to the nozzle and is in fluid communication with the nozzle. As pressurized water is supplied to the nozzle, the water is projected through the apertures. This water projecting in the rearward direction propels the nozzle with a forward thrust in a forward direction and thereby enables the rocket nozzle to be pulled through the SUBSTITUTE SHEET drain tile. To clean the foundation drain tile, it is first necessary to locate the junctures of the interconnecting pipes that are located underneath the basement floor with the various segments of the drain tile. The position of each juncture is determined by inserting the rocket nozzle of the cleaning apparatus into a centralized drain in the basement floor. The nozzle is in fluid communication with a high pressure fluid supply line. The nozzle is propelled through the interconnecting pipe, but will stop at the juncture between the pipe and the drain tile since the nozzle cannot overcome the radical bend between the interconnecting pipe and the drain tile. The position of the nozzle is located by the sound that the fluid makes which can be heard through the floor of the basement as the water is projected through the nozzle. Once the position of a juncture is located, a cleanout pipe is inserted into the basement floor by digging up the basement floor around the juncture. The cleanout pipe is installed so that it is in fluid communication with the interconnecting pipe, preferably just inside the foundation wall, and the cleanout pipe is accessible from the basement floor. After the cleanout pipes have been installed, highly pressurized water is supplied to the cleaning apparatus at a sufficient pressure to project the nozzle through the drain tile enabling the nozzle to cut through essentially any blockage that may exist. A foot pedal control valve is used to start and stop the water flow into the tubing and into the nozzle. The valve is operable by the operator applying pressure to the pedal. The flow of the pressurized water through the nozzle causes the pressurized water to be projected through the opening in the nozzle tip. As the nozzle is propelled through the drain tile, the water flowing through the nozzle tip is continually directed at blockages of the debris with sufficient force to bore through the blockages SUBSTITUTE SHEET and separate the debris from the drain tile. For a more complete understanding of the foundation drain cleaning apparatus and methods of the present indention, reference is made to the following detailed description and accompanying drawings in which the presently preferred embodiment of the invention is illustrated by way of example. It is expressly understood, however, that the drawings are for purposes of illustration and description only, and are not intended as a definition of the limits of the invention. Throughout the following description and drawings, identical reference numbers refer to the same component throughout the several views. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the preferred embodiment of the foundation drain cleaning apparatus of the present invention; FIG. 2 is a plan view of a typical foundation drain located around the perimeter of a building structure; FIG. 3 is a sectional side view depicting a juncture of the drain tile and interconnecting pipe taken along Section 3-3 of FIG. ' 2; FIG. 4 is a detailed perspective view of the nozzle depicted in FIG. 2; FIG. 4A is another detailed perspective view of the nozzle depicted in FIG. 4; and FIG. 5 is a a detailed perspective view of the foot pedal control valve shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, a conventional drain tile 10 is shown in FIG. 2 which surrounds the perimeter of the building structure 12. It is to be understood, however, that the principles of this invention are equally applicable to any foundation drain tile system, including a drain tile that is located underneath the perimeter of the basement 14, and that the system depicted in FIG. 2 is used only for purposes of illustration. SU STITUTE SHEET The basement floor 14 is usually poured concrete. The side walls 16 are of conventional construction and are built up from a plurality of individual concrete blocks 18 which are positioned on a footer lδ. Gravel 20 is filled over the drain tile 10 and thereabouts. The gravel 20 is water permeable material which permits the water to readily filter and pass through the porous wall of the tile 10. The drain tile 10 is situated relative to the building structure 12 so that any water that collects in the vicinity of the building structure 12 is routed across and into the drain tile 10. The drain tile 10 consists of water porous tile and is laid in a continuous channel that feeds into either a sump pump or a centralized sewer. Building drain tiles are generally in fluid communication with a series of interconnecting pipes 22, which are required by building codes to prevent blockage therein, at a series of junctures 24, the pipes 22 being disposed underneath the basement floor 14 of the building structure 12. Generally, these interconnecting pipes 22 have more gradual bends in the direction of fluid flow and are accessible through one of several floor drains 26 located in the basement floor 13. These interconnecting pipes 22 can be extremely important and useful in cleanin the drain tile 10, as will later be described. FIG. 1 shows a perspective view of the foundation drain tile cleaning apparatus 30 of the present invention. The apparatus 30 consists of a rocket nozzle 32 in fluid communication with flexible tubing 34, a high pressure fluid supply 36, and a foot pedal control valve 40 for starting and stopping the fluid flow. The rocket nozzle of the present invention 32 (as depicted in FIGS. 4 and 4A) is made of tool steel, and has a head portion 42 and a tail portion 44. The high pressure waterblast nozzles 32 are commercially available from the NLB Corporation, and are designed as Part Number P-4 10K. The head portion 42 has an opening 46 on the tip thereof SUBSTITUTE SHEET through which pressurized fluid, preferably water, is dischargeable in the forward direction. The tail portion 44 of the nozzle 32 is in fluid communication with a high pressure water supply. The nozzle 32 has a recess 48 between the head portion and the tail portion, the recess having a rearward surface 43, At least two apertures 50 are disposed along the recess 48. The water propelled through the apertures δO serves the dual function of 1 ) propelling the cleaning apparatus 30 through the drain tile 10, and 2 cleaning the inside surface of the drain tile 10. The greater the number of apertures δO, the greater will be the propelling force applied to move the nozzle 32 farther into the drain tile 10, but the lesser will be the force of the water jet projected from the tip 46 of the nozzle 32. Similarly, as the number of apertures δO decreases, the propelling force diminishes, but the greater will be the force of the water jet projected from tije tip 46 of the nozzle 32. The operator will usually have to use more than one nozzle 32 to locate the junctures 24 and to clean the complete drain tile 10, depending upon the remoteness of the locations of the blockages in the line. Generally, the cleaning out of the debris from the inside of the drain tile 10 is completed by using a nozzle 32 with no tip opening 46, so that the pressure of the water jets projecting -from the apertures δO is maximum. The flexible tubing 34 is capable of withstanding the - -f.low of high pressure water. The tubing 34 is secured to the nozzle 32 by tubing fittings that are capable of withstanding high pressure water flow. The tubing 34 is in fluid communication with the nozzle 32. Water at a pressure between 2200 and δ200 psi is supplied to the tubing 34. A pump (not shown) of standard design that is well known in the art is connected to the tap water to raise the supply pressure of the water to the desired range. ' - A " high pressure supply line is used to connect the SUBSTITUTE SHEET water pump to the foot pedal control valve 40. The flow rate of water through the nozzle 32 is about 4.δ gallons/minute . FIG. δ depicts the on-off foot pedal control valve 40, which is used to start and stop the water flow into the tubing and into the nozzle. The operation of the foot control valve 40 is similar to the operation of a gun, except that it is operated by a foot pedal instead of a hand lever. The unite is preferably lightweight and portable, having a handle 60 for the easy transporting thereof. The control valve 40 receives pressurized water through a supply line 36. The supply line 36 is in fluid communication with an output line 34, the output line 34 being insertable into the drain tile 10 to be cleaned. The control valve 40 has a lever 66 which is actuated by a foot of the operator, the lever 66 being preferably spring-actuated. When fluid is flowing through the control valve 40 actuation of the lever 66 by the operator will terminate fluid flow to the output line 34. When fluid is not flowing through the control valve 40 but is being provided through the supply line 62 actuation of the lever 66 by the operator will initiate fluid flow to the output line 64. By operating the control valve 40 with his foot the operator has both hands free to manipulate the flexible tubing 34 into and through the drain tile 10. Also, for prolonged usage of the cleaning apparatus 30 it is considerably easier for an operator to apply pressure with a foot than by hand. The operator must always be in in control of the flexible tubing 34 and the nozzle 32, particularly when the nozzle 32 is close to the entry into the drain tile 10, because of the risk of personal injury from the high pressure water. As pressurized water is supplied to the nozzle 32, the water is projected through the apertures δO, propelling the nozzle 32 in a forward direction through the drain tile SUBSTITUTE SHEET 10. The flow of the pressurized water through the nozzle 32 causes the pressurized water to be projected through the tip opening 46 in the nozzle 32. As the nozzle 32 is propelled through the drain tile 10, the water flowing through the nozzle tip 46 is continually directed at the debris at sufficient force to separate the debris from the drain tile 10. The water serves the dual function of washing the debris through the drain tile 10 and into either a sump pump or a central sewer. The method of the present can be used to clean the foundation drain tile 10 by first locating the position of the junctures 24 of the interconnecting pipes 22 with the drain tile 10. The interconnecting pipes 22 are in fluid communication with the various segments of the drain tile 10 at a series of junctures 24. First, the position of each juncture 24 is determined by inserting the rocket nozzle 32 of the cleaning apparatus 30 depicted in FIG. 1 into a centralized drain 26 in the basement floor 14. The rocket nozzle 32 is in fluid communication with a high pressure fluid supply line 36. The rocket nozzle 32 is propelled through the inteτconnecting pipe 22 when the control apparatus 30 is energized. -The nozzle 32 will stop at the juncture 24 between the interconnecting pipe 22 and the drain tile 10, since the rocket nozzle 32 cannot ordinarily overcome the radical bends that generally exists between the interconnecting pipe 22 and the drain tile 10. Also, the pressure in the supply line 36 can be maintained at a low- enough level to regulate the movement of the rocket nozzle 32 around these corners. The operator can overcome the radical bends in the pipes 22 and the drain tile 10 with' a rapid series of bursts on the lever 66 of the foot pedal control valve 40 coupled with his turning the flexible tubing 34. The position of the rocket nozzle 32 is located through the floor of the basement 14 by the sound that the fluid makes as it escapes from the nozzle 32. SUBSTITUTE SHEET Once the position of a juncture 24 is located, a cleanout pipe 64 is inserted into the basement floor 14 by digging through the basement floor 14 in the vicinity of the juncture 24. The cleanout pipe 64 is installed so that it is in fluid communication with the interconnecting pipe 22. The cleanout pipe 64 is preferably located just inside the foundation sidewalls 16, and the cleanout pipe 64 is located so that it is accessible from the basement floor 14 for subsequent cleaning and maintenance of the drain tile 10. As shown in FIG. 3 the cleanout pipes 64 are preferably joined to the interconnecting pipes 22 underneath the basement floor 14 near each juncture 24 along each wall of the building structure. The rocket nozzle 32 is inserted into the drain tile 10. Once the cleanout pipe 64 is inserted into the interconnecting pipe 22 near a juncture 24, the nozzle 32 is inserted at least sixteen inches into the cleanout line 64. The operator then pushes down on the foot pedal control valve 40, which enables all of the water to be directed into the rocket nozzle 32. The sixteen inch point on the flexible tube 34 is marked with tape, so that it can be easily recognized when the rocket nozzle 32 is withdrawn from the drain tile, so that the foot pedal control valve 40 can be shut down and the cleaning apparatus 30 de-energized. As pressurized fluid is projected through the nozzle apertures δO in a rearward direction, the rocket nozzle 32 is propelled through the drain tile 10 in a forward direction. As pressurized fluid is projected through the nozzle tip opening 46 in a forward direction, the jet spray separates the debris from the drain tile 10. While the foundation drain cleaning apparatus and method have been described in conjunction with a specific embodiment, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the disclosure herein. It is intended that all such alternatives, modifications, and SUBSTITUTE SHEET variations are included herein that fall Tvithin the spirit and scope of the appended claims. SUBSTITUTE SHEET

Claims: CLAIMS 1. An apparatus for cleaning debris from a foundation drain tile, the drain tile being in the immediate proximity of a building structure, the apparatus employing a flow of a pressurized fluid which is supplied thereto, the apparatus comprising: (a) a rocket nozzle having a head portion and a tail portion, the rocket nozzle having a plurality of openings therein through which the pressurized fluid is dischargeable therefrom, the tail portion of the nozzle being securable to a fluid supply; (b) flexible tubing capable of withstanding the flow of the pressurized fluid, the tubing being secured to the nozzle, and the tubing being in fluid communication with the nozzle; and (c) means for propelling the nozzle in a forward direction through the drain tile as the pressurized fluid is projected through the nozzle openings and directed at the debris with sufficient force to separate the debris from the drain tile. 2. The apparatus of Claim 1, wherein the starting and stopping means is a control valve that is operable by applying pressure to a foot pedal. 3. The apparatus of Claim 1, wherein the pressurized fluid is water that not only separates the debris from the drain tile but also washes the debris through the drain tile. 4. The apparatus of Claim 3, wherein the pressure of the water in the flexible tubing is in the range of 2200 to δ200 psi. δ. The apparatus of Claim 1, wherein the nozzle has a recess between the head portion and the tail portion, the recess having a rearward surface, and the nozzle having at least two apertures along the recess through which the pressurized fluid is dischargeable therefrom in a rearward SUBSTITUTE SHEET direction. 6. The apparatus of Claim δ, wherein the pressurized fluid flow escaping through the apertures serves as the propelling means for the nozzle and the tubin . 7. A rocket nozzle to be used for cleaning debris from a foundation drain tile, the rocket nozzle having a head portion and a tail portion, the nozzle comprising: (a) an opening on the tip of the head portion of the nozzle through which pressurized fluid is dischargeable in a forward direction therefrom; (b) means for securing the tail portion of the nozzle to flexible tubing so that the flexible tubing is in fluid communication with the nozzle, the flexible tubing being capable of transporting pressurized fluid into the nozzle; (c) a recess disposed between the head portion and the tail portion of the nozzle, the recess having a rearward surface; and (d) at least two apertures disposed along the rearward surface, wherein pressurized fluid is dischargeable from the apertures in a rearward direction. 8. The apparatus of Claim 7, wherein the pressurized fluid is water. 9. The apparatus of Claim 8, wherein the pressure of water in the flexible tubing is in the range of 2200 to δ200 psi. 10. The apparatus of Claim 7, wherein the pressurized fluid flow escaping through the apertures serves as the propelling means for the nozzle and the tubing through the drain tile. 11. A method of cleaning debris from a foundation drain tile, the drain tile being in the immediate proximity of a building structure, the method comprising: (a) inserting a rocket nozzle and fluid line into SUBSTITUTE SHEET the drain tile from inside the building structure, the line being made of a flexible material, the nozzle having a head portion and a tail portion, the line being in fluid communication with the tail portion of the nozzle, a tip being located on the head portion of the nozzle, the nozzle having an opening in the tip, the nozzle having a recess, the recess having a rearward surface, the nozzle having at least two apertures along the rearward surface of the recess; (b) starting the flow of pressurized fluid into the line; (c) projecting the pressurized fluid through the nozzle apertures in a rearward direction, thereby propelling the nozzle through the drain tile in a forward direction; and (d) projecting the pressurized fluid through the nozzle tip in a forward direction at the debris, thereby separating the debris from the drain tile. 12. The method of Claim 11, wherein the pressurized fluid is water that separates the debris from the drain tile and washes the debris through the drain tile. 13. An on-off flow control valve to be used by an operator for cleaning and removing debris from a foundation drain tile, the valve comprising: (a) a supply line which provides pressurized fluid to the valve; (b) an output line w τ hich is in fluid communication with the supply line, the output line being insertable into the drain tile to be cleaned; and (c) a lever which is actuated by a foot of the operator, wlereby when fluid is flowing through the valve actuation of the lever by the operator will terminate fluid flow to the output line, and whereby when fluid is not flowing through the valve but is being provided through the supply line actuation of the lever by the operator will SUBSTITUTE SHEET initiate fluid flow to the output line. 14. The valve of Claim 13, where the pressurized fluid is water. lδ. The valve of Claim 14, where the water pressure is in the range of 2200 to δ200 psi. 16. A foundation drain tile cleaning system comprising: (a) a drain tile disposed in the immediate proximity of the perimeter of a basement of a building structure, the drain tile having means of disposing fluid contained therein; (b) a plurality of interconnecting pipes disposed within the interior of the building structure beneath the surface of the basement, the pipes being in fluid communication with the drain tile; and (c) a series of cleanout pipes, each cleanout pipe being in fluid communication with one of the interconnecting pipes, each cleanout pipe being accessible frqm the basement surface for periodic cleaning of the drain tile system. 17. The system of Claim 16, wherein the disposing means is a sump pump which is in fluid communication with the system, 18. The system of Claim 16, wherein the disposing means is a central sewer which is in fluid communication with the system. 19. A method for accessing a foundation drain tile, the drain tile being disposed in the immediate proximity of a building structure, the drain tile being in fluid communication with a plurality of interconnecting pipes, the interconnecting pipes being disposed underneath the building structure, the method comprising: (a) determining the position of a junction between an interconnecting pipe and the drain tile; and (b) installing a cleanout pipe the cleanout pipe being in fluid communication with an interconnecting pipe SUBSTITUTE SHEET in the immediate proximity to a junction, and the cleanout pipe being accessible from inside the building structure. 20. The method of Claim 19, wherein the position of each junction is determined by inserting a rocket nozzle into a drain in the floor of the building structure, the rocket being in fluid communication with a high pressure fluid supply line, and locating the position of the rocket nozzle through the floor of the building structure by the sound of the fluid escaping from the nozzle. 21. A method for cleaning a foundation drain tile, the drain tile being disposed in the immediate proximity of a building structure, the drain tile being in fluid communication with a plurality of interconnecting pipes, the interconnecting pipes being disposed underneath the building structure, a plurality of junctions being disposed where the interconnecting pipes join the drain tile, a cleanout pipe being disposed near a junction of an interconnecting pipe and the drain tile, the cleanout pipe being accessible from inside the building structure, the method comprising: (a) inserting a rocket nozzle into the cleanout pipe, the rocket nozzle being in fluid communication with a supply of highly pressurized fluid; and (b) propelling the rocket nozzle through the cleanout pipe and into the drain tile in a forward direction by means of a highly pressurized fluid which escapes from the rocket nozzle in a rearward direction, as the highly pressurized fluid separates the debris from the drain tile. 22. A method for accessing a foundation drain tile, the drain tile being disposed in the immediate proximity of a building structure, the drain tile being in fluid communication with a plurality of interconnecting pipes, the interconnecting pipes being disposed underneath the building structure, the interconnecting pipes being accessible from a drain disposed in a floor of the building SUBSTITUTE SHEET structure} a plurality of junctions being disposed where the interconnecting pipes join the drain tile, a cleanout pipe being disposed near a junction of an interconnecting pipe and drain tile, the cleanout pipe being accessible from inside the building structure, the method comprising: (a) inserting a rocket nozzle into the drain, the rocket nozzle being in fluid communication with a highly pressurized fluid supply; (b) propelling the rocket through the interconnecting pipes in a forward direction by means of the pressurized fluid escaping from the rocket nozzle in a rearward direction; (c) locating the position of the rocket nozzle at a junction through the floor of the building structure by the sound of the fluid escaping from the rocket nozzle; and (d) installing a cleanout pipe, the cleanout pipe being in fluid communication with an interconnecting pipe in the immediate proximity to a junction, and the cleanout pipe being accessible from inside the building structure. 23. A method for cleaning a foundation drain tile, the drain tile being disposed in the immediate proximity of a building structure, the drain tile being in fluid communication with a plurality of interconnecting pipes, the interconnecting pipes being disposed underneath the building structure, and a plurality of junctions being disposed between the drain tile and the interconnecting pipes, the method comprising: (a) determining the position of a junction between an interconnecting pipe and the drain tile; (b) installing a cleanout pipe, the cleanout pipe being in fluid communication with an interconnecting pipe in the immediate proximity to the junction, and the cleanout pipe being accessible from inside the building structure; (c) inserting a rocket nozzle into the cleanout pipe, the rocket nozzle being in fluid communication with a SUBSTITUTE SHEET high pressure fluid supply line; and (d) propelling the rocket nozzle through the cleanout pipe and into the drain tile in a forward direction by means of a highly pressurized fluid which escapes from the rocket nozzle in a rearward direction, as the highly pressurized fluid separates the debris from the drain tile. 24. A method for cleaning debris from the interior surface of interconnecting pipes and drain tile, the drain tile being disposed in the immediate proximity of a building structure, the drain tile being in fluid communication with a plurality of the interconnecting pipes, the interconnecting pipes being disposed underneath the building structure, the interconnecting pipes being accessible from a drain disposed in the floor of the building structure, and a plurality of functions being disposed between the drain tile and the interconnecting pipes, the method comprising: (a) inserting the rocket nozzle into the floor drain; (b) propelling the rocket nozzle through the interconnecting pipes in a forward direction by means of a highly pressurized fluid which escapes from the rocket nozzle in a rearward direction, as the highly pressurized fluid separates the debris from the interconnecting pipes; (c) determining the position of a junction between an interconnecting pipe and the drain tile; (d) installing a cleanout pipe, the cleanout pipe being in fluid communication xvith an interconnecting pipe in the immediate proximity to the junction, and the cleanout pipe being accessible from inside the building structure; (e) inserting the rocket nozzle into the cleanout pipe; and (f) propelling the rocket nozzle through the cleanout pipe and into the drain tile in a forward SUBSTITUTE SHEET direction by means of a highly pressurized fluid which escapes from the rocket nozzle in a rearward direction, as the highly pressurized fluid separates the debris from the drain tile. SUBSTITUTE SHEET

Inventors: DYKMAN K RAND, FRANCIS THOMAS, DYKMAN, K. RAND, FRANCIS, THOMAS
Applicants: FRANMAN INC, FRANMAN, INC.
Application year: 1990
Main classification: B08B3
IPC codes: B08B9, E03C1, E03F9