Fluid handling – With repair – tapping – assembly – or disassembly means – Tapping a pipe – keg – or apertured tank under pressure
Reexamination Certificate
2003-04-04
2003-12-02
Walton, George L. (Department: 3753)
Fluid handling
With repair, tapping, assembly, or disassembly means
Tapping a pipe, keg, or apertured tank under pressure
C030S443000, C062S292000, C062S294000, C081S421000, C081S423000, C081S426000, C137S614050, C137S883000, C141S329000, C141S348000, C222S005000, C222S081000, C222S083000, C222S083500
Reexamination Certificate
active
06655407
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to tools utilized in conjunction with refrigeration systems and, in an embodiment described herein, more particularly provides a refrigerant charging tool.
It is common practice to introduce fluid into a refrigeration system, such as an automotive air conditioning system, from a container in which the fluid is commercially packaged. For example, relatively small quantities of refrigerants such as R-12 and R-134a are typically packaged in generally cylindrical cans. A special purpose tool is commonly utilized to dispense the refrigerant and/or other fluid (e.g., lubricant, leak detector, seal rejuvenator, etc.) into the refrigerant system.
Many forms of these tools have been promulgated in the past, each of which typically includes a means for securing the container, a means for piercing the container, a means for sealing the pierced container, and a means for delivering the fluid from the pierced container to the refrigeration system. In one such tool, the container is secured by encircling the container within a flexible ring portion extendably attaching two handles to each other. A hollow piercing needle projects inwardly from the ring opposite a portion of the tool where the handles are squeezed together. When the handles are squeezed together, the circumference of the ring decreases, thereby forcing the container against the needle, and eventually causing the needle to puncture the container. If the container is substantially smaller than the ring (i.e., if the ring is sized for a larger container, such as a refrigerant can, as opposed to a smaller container, such as a typical oil charge can), a spacer must be utilized in the area between the container and the portion of the tool where the handles are squeezed together.
Unfortunately, such tools require a relatively large force to squeeze the handles together, due to the fact that the container presses against the portion of the tool where the handles are squeezed together, at the same time as the handles are being squeezed together. Additionally, where the spacer is utilized, the spacer must be positioned adjacent the portion of the tool where the handles are squeezed together, which positioning is relatively difficult to accomplish, and difficult to maintain while the handles are being squeezed together. Furthermore, the placement of the needle on the ring opposite the portion of the tool where the handles are squeezed together prevents convenient use of a hinged pivotable attachment between the handles at that position. Still further, such tools do not have interchangeable spacers to accommodate differently shaped containers of refrigerant or other fluids, for example, standard sized cans of R-12 and R-134a refrigerant and oil charge cans.
From the foregoing, it can be seen that it would be quite desirable to provide a tool which does not require the container to press against a portion of the tool being squeezed together, and which does not require, for smaller containers, that a spacer be positioned at the portion of the tool being squeezed together, but which permits enhanced convenience in utilization of the tool, and which includes spacers configured to accommodate differently shaped containers. It is accordingly an object of the present invention to provide such a tool.
SUMMARY OF THE INVENTION
In carrying out the principles of the present invention, in accordance with an embodiment thereof, a refrigerant charging tool is provided which is configured to permit convenient use thereof with differently shaped containers.
In broad terms, a tool is provided for use in dispensing fluid from a selected one of differently shaped containers into a refrigeration system. The tool includes two pivotably attached handles, a container piercing member, and interchangeable container spacers.
Each of the handles has a grip portion and a container receiving portion. The handles are separately formed from each other and are pivotably attached via a hinged connection opposite the grip portion of each handle. Each container receiving portion is generally semi-circular shaped. The handles are releasably securable in a closed position by a locking device positioned between the handle grip portions.
The container piercing member projects inwardly from one of the handle container receiving portions. A selected one of two container spacers releasably attaches to one of the handle container receiving portions. The container spacers are each configured to position the correspondingly shaped container laterally away from one of the handle container receiving portions and toward the container piercing member.
These and other features, advantages, benefits and objects of the present invention will become apparent to one of ordinary skill in the art upon careful consideration of the detailed description of a representative embodiment of the invention hereinbelow and the accompanying drawings.
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Konneker & Smith P.C.
Konneker, Esq. J. Richard
Smith, Esq. Marlin R.
Technical Chemical Company
Walton George L.
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