Patent Application
20180354111
Not applicable
Not applicable
Not applicable
This invention relates to the cartridges found in water faucets and showers, most of which are manufactured by the Moen Company, other companies also applying the now expired patent. The cartridge is generally single-handled and works by mixing hot and cold water through the up and down, right and left, turning of the single-handle. (The water then flows from either the shower head or faucet according to how the handle is adjusted.) After the passage of considerable time, the cartridge eventually “wears out” in the sense of becoming corroded and non-functional, due to the corrosive impact of impurities in the water. This invention is intended to remove the defective cartridge without harming the plumbing structure which undergirds it.
The Moen Corporation makes a tool for cartridge removal which works part of the time but is restricted to core-pulling: the sleeve is often left behind in the wall or the faucet. Also, the Moen tool requires the use of a wrench for torsion. Rucker, U.S. Pat. No. 6,929,024 discloses a secondary tool to be used as an addition to the Moen tool. It is superior to the Moen tool but still has major disadvantages. That is, Rucker teaches a large custom-design tap which is intended to be attached to the end of the Moen tool and is used to cut threads into the wall of the sleeve. The tapping process is unfamiliar to most do-it-yourselfers and is difficult to execute. The tapping process also has the disadvantage of creating metal shreds which could easily pass through holes in the sides of the sleeve and thereby wedge between the sleeve and the housing. The metal shreds are likely to cause damage to the wall of the housing during the core-pulling process. Also a significant disadvantage of Rucker is the fact that frozen sleeves generally require a twisting motion to break up the rigid sediment between the sleeve and the wall of the housing. Rucker does not provide that twisting motion. The disadvantages of Rucker are chiefly that it is expensive, requires extensive mechanical knowledge and that it is subject to failure.
A tool for pulling both core and sleeve is taught by Hseu, U.S. Pat. No. 5,119,556. Hseu is better than Rucker as it uses a cylinder which engages by sliding on a threaded rod. A flat handle is threaded onto the rod above the cylinder. On the rod below the cylinder is a thin, oval washer and below the washer is a stop, which is threaded on near the bottom end of the rod in order to retain the washer. Below the stop is a thread which engages the thread in the core. The tool is attached to the core and the cylinder is placed against the rim of the housing. The threaded handle is advanced along the rod and presses on the cylinder in order to create a pulling force on the core. To operate the tool, the cylinder must be held against the rim of the housing, after which the handle must be turned and the threaded rod must be held to prevent it from turning. The operation of the Hseu tool is awkward and requires significant amounts of dexterity.
The tool disclosed by Seminario, U.S. Pat. No. 3,952,394 is a better tool for pulling a Moen cartridge but it also suffers from a number of problems. Seminario shows a core-pulling device which presents difficulties in actual usage. Seminario teaches that the core should be removed by “a relative motion of the threaded rod and the bar” of the tool. This is difficult to perform because a cylinder must be held in contact with the rim of the housing, while the threaded rod must be prevented from turning while the bar is rotated. This awkward maneuver is similar to the Hseu tool—and thus shares its disadvantages.
Finally, a cartridge puller is disclosed by English, U.S. Pat. No. 7,987,571, which corrects some of the problems of both Hseu and Seminario. English teaches a cartridge puller consisting of a core puller, a sleeve puller and an interchangeable handle. The sleeve puller has an external hex on its body for the attachment of a wrench to apply substantial, sharp twisting forces to the jammed sleeve, frozen by corrosion and sediment. The necessity of a wrench makes it inferior to the ease of my new invention which requires no wrench, needing only itself to perform both core pulling and sleeve pulling.
The present invention requires NO wrench and it may be used by inexperienced users of no particular strength. This new invention is inexpensive and conceptually simple; thus, it is ideal for weekend handymen or other amateur do it yourselfers. It is also well-adapted for professional plumbers.
The present invention is a tool which is capable of removing and replacing a shower mixing valve known as a cartridge, especially those recognized by the generic name of Moen. This can be done easily and quickly by a worker of average skill and dexterity. It does not require a professional plumber, which is the chief drawback of most prior inventions dealing with removal and replacement of shower and faucet cartridges. My invention provides a more sure control to replace both the core and the sleeve, without the use of a wrench, tap or potentially awkward additional tool. My invention is complete in one unit, everything is contained in a single tool, without the drawbacks and complexity of other conventionally available tools and methods. The one-handed tool I have invented consists of a vise-grip type pliers, made for instance by Milwaukee Manufacturing. The pliers come with flat plates as bills on the mouth of the pliers. I drilled at the billed end of the pliers, in between the adjoining plates with a 7/16″ drill to make the circular, concave bills that can grasp the core of the plumbing fixture known as the cartridge. To the tension adjustment/screw end of the vise-grip pliers, I threaded the shaft of an Ace stem and cartridge puller by Pasco, so it becomes one piece with the pliers. This facilitates the tension adjustment of the pliers and utilizes the nipple feature on the opposite side of the Pasco stem and cartridge puller to grasp the outer sleeve of the plumbing cartridge. When retrieving the core from the cartridge, the first thing that my invention does is to grasp the protruding core of the cartridge with the concave feature of the bills of the vise-grip pliers. The vise-grip pliers are then turned from side to side while pulling, which will remove both the core and the sleeve of the cartridge out of the valve body under favorable conditions. Often, however, due to corrosion and broken o-rings, the sleeve portion of the cartridge may remain lodged in the valve body, at which time the opposite screw end of my invention is used. The threaded Pasco stem puller with the nipple attached to the screw end of the pliers must be employed to remove the recalcitrant sleeve. That is, the cartridge sleeve pulling feature at the other end of the threaded tension adjustment shaft has a nipple at the end which fits into a hole manufactured in the sleeve. Then the sleeve can be removed by a person of average skill and dexterity. Replacement of a new cartridge assembly is easily facilitated with positive control of the cartridge securely held by the concave bill section of the pliers which is then pushed into position within the plumbing housing.
