The invention relates generally to a coupling and decoupling apparatus and method capable of providing easily adjustable coupling of at least two components and more specifically to an easily adjustable apparatus and method of electrical metallic conduit coupling and uncoupling.
The present invention relates to an apparatus and method for quickly and easily coupling EMT conduit together.
A prior art expansion coupling 20 illustrated in
Yet another prior art coupling 20 is illustrated in
Therefore there remains a need for a coupling that is inexpensive to manufacture, requires little effort to install, skill, or tools to install and remove, that has few components and that is easily inspected to determine if it installed properly.
Accordingly, the present invention overcomes the limitations of the prior art by providing a unique and useful coupling and decoupling apparatus capable of providing a visual indication that an EMT conduit length is properly ‘locked’ in place, that is easy to apply and remove from the EMT conduit, and a method of using such an apparatus.
Consequently, the following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the invention. It is intended to neither identify key or critical elements of the invention nor delineate the scope of the invention. Its purpose is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.
It is an object of the present invention to provide a new and improved coupling apparatus and method that provides visual indication that an EMT conduit length is properly ‘locked’ in place.
It is a further object of this invention to present a coupling apparatus and method that allows both easier coupling and uncoupling of EMT conduit.
It is an object of the present invention to provide a more economical coupling apparatus and method that attaches easily and safely to an EMT conduit length with little effort or skill.
It is yet another object of this invention to provide a coupling apparatus and method that is usable on a variety of non-fixedly attached components, such as for example, water hose connections, spliced metal cable, spliced ropes, vacuum hoses, quick release tools, concrete conduit length and the like.
It is yet a further object of the present invention that the coupling apparatus and method can be used to couple and/or uncouple an EMT conduit length without the use of tools.
It is an additional object of the invention to utilize friction to hold the coupling apparatus in place while still allowing for expansion/contraction of EMT conduit.
It is yet another object of this invention to provide a coupling apparatus and method wherein bonding and/or grounding effectiveness increases when pulling force on the EMT conduit sections is applied to the coupling apparatus.
It is another object of this invention to provide a coupling apparatus comprising a flange and mounting holes and method wherein the coupling apparatus can be fastened to or hung on a wall, ceiling, structural surface, and the like.
It is another object of this invention to provide a coupling apparatus and method wherein the coupling apparatus can be stamped and formed from a single piece of flat stock.
It is another object of this invention to provide a coupling apparatus and method wherein the coupling apparatus can be manufactured to be water tight, concrete tight, and the like.
It is another object of this invention to provide a coupling apparatus and method wherein a first opening and a second opening of the coupling apparatus are equal in size and/or shape.
Yet another object of this invention is to provide a coupling apparatus and method wherein a first opening and a second opening of the coupling apparatus are not equal in size and/or shape.
It is another object of this invention is to provide a coupling apparatus and method wherein a first opening and a second opening can comprise a circular shape, a rectangular shape, an oval shape and the like.
It is another object of this invention is to provide a coupling apparatus and method wherein the coupling apparatus can join metal components, concrete components, wooden components and the like.
It is another object of this invention is to provide a coupling apparatus and method wherein the coupling apparatus material comprises metal, conductive plastic, plastic, composites, and the like.
Embodiments of the invention will now be described with reference to the accompanying drawings.
One or more implementations of the present invention will now be described with reference to the attached drawings, wherein like reference numerals are used to refer to like elements throughout. The invention relates generally to a coupling apparatus and method that is inexpensive, requires little effort or skill to install/remove; and is easy to inspect to determine if it installed properly.
Referring now to the drawings, one embodiment of the invention is illustrated in
Although the first and/or the second finger/thumb tab, 318 and 322 are shown as small tabs, the tabs can be much larger in width, length and thickness as known by one of skill in the art. In addition, a plurality of tabs (not shown) may be located at any location around the first and the second flexible support arms 304 and 308 and are still within the scope of the invention. The inventor also recognizes that the coupling apparatus 300 may be manufactured without any tabs for reasons of economy.
The first flexible support arm 304 with the first arm opening 306 and the second flexible support arm 308 with the second arm opening 310 both act as ‘pinch plates’ to alternately pinch and/or be moved to release the EMT conduit lengths ends. Although the first arm opening 306 and the second arm opening 310 are illustrated to be of equal sizes, the inventor also envisioned central housing openings (not shown) of differing sizes wherein one side accepts a larger diameter EMT conduit length and another side accepts a smaller diameter EMT conduit length so that a step from the housing smaller diameter to the housing larger diameter is created within the housing opening.
Additionally, a central series of indents/dimples or a cylindrical stop (not shown), for example can be created or machined into the smaller diameter housing near the housing center to act as a stop for the smaller diameter EMT conduit, or other techniques as known by those of skill in the art. Similarly, the central housings and arm openings can have various shapes comprising rectangles, ovals, hexagons, and the like, known by those of skill in the art. Also, the inventor envisioned housings than are tapered housings and alternatively flexible support arms that have unconnected parting line edges so that the coupling housing can be slipped over the conduit, with interlocking fingers, a surface that can be crimped in place, and other parts and techniques known by those of skill in the art to fasten the unconnected parting line edges together. In other words, the central housing 302 is not completely formed into a cylindrical shape. A first edge 911 is not connected to a second edge 913 (see e.g.,
A plurality of o-rings (not shown) can be added to the coupling apparatus 300, for example, as known by those of skill in the art to make the coupling apparatus 300 liquid tight, concrete tight and the like. In place of the o-ring, it is possible to bond an elastomeric sealing element/polymer, and the like known by those of skill in the art to make the coupling apparatus 300 liquid tight. In addition, the inventor envisioned a coupling apparatus 300 that permits the coupling and decoupling of conduit length from angles other than 180 degrees so that the run of EMT need not be parallel. For example, the coupling apparatus 300 can allow EMT conduit lengths to be connected at an angle of 90 degrees, in a u-shape, an s-shape, a tapered shape for connecting tapered conduit ends or other angles known by those of skill in the art.
Referring to
Although the angle θ (505) is illustrated as between 11 and 22 degrees, other angles can be employed by those of skill in the art, such as between 2 and 90 degrees. In addition, the first and second arms 304 and 308 may comprise complex angles with respect to the housing axis 301.
It should be understood that the embodiment of the invention disclosed herein merely illustrate principles of the invention in a preferred form. Other modifications, additions and deletions may be made thereto without departure from the scope of the invention as set forth in the following claims.
Another embodiment of the invention is described in
In one embodiment, a first arm opening 906 and a second arm opening 910 is approximately 2.25 inches in diameter. A length and width of a first and/or second finger/thumb tab, 918 and 922 is approximately 0.375 inches. A width and a length of an inner/outer surface are approximately 3.25 inches and approximately 7.5 inches respectively. A distance between centers of a first arm opening 906 and a second arm opening 910 centers is 7.25 inches. The distance between an outside edge of a first and an outside edge of a second finger/thumb tab, 918 and 922 is approximately 10.6 inches. However one skilled in the art could modify the dimensions, for example to couple a cement sewer component 8 feet in diameter or greater, even smaller diameter conduit, for example one half inch, and the like known by those of skill in the art.
The coupling apparatus 900 includes a flat portion 902 that is formed into the central housing 302 of
Although the first flexible support arm 904 and the second flexible support arm 908 are shown to be symmetrical with respect to axis 930, the inventor recognizes that the support arms 904, 908 do not have to be symmetrical about axis 930. In addition, the inventor recognizes that more than two conduit ends can be held by a coupling apparatus by adding any number of coupling apparatus sections (see e.g.,
Although the first and/or the second finger/thumb tab, 918 and 922 are shown as small tabs, the tabs can be much larger in width, length and thickness as known by one of skill in the art. In addition, the first and/or the second finger/thumb tab, 918 and 922 can have various shapes comprising triangular, circular, oval, and the like and can be formed with hand grips, for example, made of and/or coated with materials comprising metal, plastic and the like, known by those of skill in the art. In addition, the coupling apparatus 300 can be made in various manufacturing processes comprising forgings, castings, stampings etc.
Referring to
According to another exemplary aspect of the present invention,
As illustrated in
The coil of the steel is fed into a progressive stamping machine with multiple stations. Each station in the progressive stamping machine has a function such as cutting, shearing, forming and bending, for example. The stamping machine functions as both a punch press and brake in that as the coil of steel is uncoiled and fed into the machine, the coiled steel first becomes a long strip much like unwinding a ribbon from its spool. Downstream from the unwinding coil, a series of dies e.g., first cuts (punches or shears) the flat steel into a flat profile that has the first and the second flexible support arm 904 and 908 (
The progressive stamping machine can have multiple ‘hits’, for example, as many hits as ninety per minute. With the progressive dies having multiple stations, for example nine stations to complete the cutting, forming, shaping and joining, each hit then will automatically do nine different functions simultaneously on the long flat ‘ribbon’ of steel as it passes through the dies in the machine. The entire operation of the nine stations within progressive stamping machine can, for example, be as short as two feet or as long as ten feet depending on the size-diameter of the various couplings being stamped.
As the cutting and forming take place within the progressive stamping machine changing the flat steel into a tubular shape, the edges of the flat steel are stamped in a way that allows opposing edges to come together and be mechanically joined as the edges may have puzzle like stamping shapes that interlock therefore holding the now formed steel into a tube for various couplings. Other methods of holding the central housing 302 together can do the same thing, such as welding the edges together in a second off line operation.
Once the ribbon of steel is converted into individual couplings, the various couplings are then tempered, annealed and coated with a suitable corrosion resistant treatment such as galvanizing, chrome or other coating. The annealing and tempering of the various couplings can convert the carbon steel into spring steel. The process, for example first heats the carbon steel to a temperature in the range of 1700 degrees F., then rapidly quenches the steel making it brittle. Then a tempering follows with the part being heated to 1400 degrees F. and then slowly the parts are air cooled. Environmental conditions and the type of carbon steel, say 1050 versus 1075 carbon steel may require more or less heat and time to anneal and temper. One skilled in the art could use suitable techniques or other known processes. After tempering and annealing, the corrosion resistant coating can be applied.
In addition, the invention contemplates a coupling being made from materials comprising spring steel, metals, conductive plastics, and the like. However if the coupling is not made in spring steel, it is possible to assemble the coupling onto the pipe, and then separate the first and the second flexible support arm 904 and 908 (
Although the invention has been illustrated and described with respect to one or more embodiments, implementations, alterations, and/or modifications may be made to the illustrated examples without departing from the spirit and scope of the following claims. In particular regard to the various functions performed by the above described components or structures (assemblies, devices, systems, etc.), the terms (including a reference to a “means”) used to describe such components are intended to correspond, unless otherwise indicated, to any component or structure which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the invention. In addition, while a particular feature of the invention may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms “including”. “includes”, “having”, “has”, “with”, or variants thereof are used in either the detailed description and the claims, such terms are intended to be inclusive in a manner similar to the term “comprising”.
Number | Date | Country | |
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61426866 | Dec 2010 | US |