|Publication number||USRE41263 E1|
|Application number||US 11/205,303|
|Publication date||Apr 27, 2010|
|Filing date||Aug 16, 2005|
|Priority date||Apr 4, 2003|
|Also published as||US6655407|
|Publication number||11205303, 205303, US RE41263 E1, US RE41263E1, US-E1-RE41263, USRE41263 E1, USRE41263E1|
|Inventors||Newton Howard Dudley|
|Original Assignee||Technical Chemical Company|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (26), Referenced by (2), Classifications (24), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
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.
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.
Representatively illustrated in
The tool 1 includes a handle assembly 10 and two interchangeable spacers. In
Referring additionally now to
The handle 12 has a generally semi-circular shaped container receiving portion 22 and a generally cylindrical grip portion 24. Similarly, the handle 14 includes a generally semi-circular shaped container receiving portion 26 and a generally cylindrical grip portion 28. Note that the handles 12, 14 are separately formed from each other, but are pivotably attached to each other by means of a pivot pin 30 installed through each of the handles adjacent the container receiving portions 22, 26, forming a hinged connection. A locking device 32 positioned between the grip portions 24, 28 releasably secures the handles 12, 14 in a closed position, as described more fully below.
The piercing member 16 is representatively illustrated as a hollow needle. The interior of the hollow piercing member 16 is in fluid communication with each of the threaded connections 36, 37. Of course, other types of container piercing members could be provided. For example, it is not necessary for the piercing member 16 to be hollow, or for it to be in the shape of a needle.
The gasket 18 is retained in a recess 34 formed on an inner side surface of the container receiving portion 22. The gasket 18 preferably contacts a container and seals between the handle 12 and the container before the container is pierced by the piercing member 16. The gasket 18 could, however, seal against the container when it is pierced, or after the container is pierced, without departing from the principles of the present invention.
The T-fitting 20 has the externally threaded connection 36 formed thereon for interconnection of the tool 1 to an industry standard flexible hose (or other type of connector) configured for use in charging R-134a refrigerant systems. The T-fitting 20 also has the externally threaded connection 37 formed thereon for interconnection of the tool 1 to an industry standard flexible hose (or other type of connector) configured for use in charging R-12 refrigerant systems. Thus, when the spacer 62 is used with an industry standard R-12 container, a corresponding industry standard R-12 connector is connected to the threaded connection 37. When no spacer is used in the tool 1 with an industry standard R-134a container received therein, a corresponding industry standard R-134a connector is connected to the threaded connection 36.
Conventional valves 38 (known to those skilled in the art as a Schrader valve) within the fitting 20 block fluid flow outwardly through the fitting, unless an industry standard hose certified for use with R-134a or R-12 refrigerant systems is connected to the respective one of the threaded connections 36, 37. Thus, the fitting 20 also performs a check valve function for both of the connections 36, 37.
For interconnection to an industry standard R-134a refrigerant system connector, the threaded connection 36 has ½ inch nominal diameter, 16 threads per inch Acme threads formed thereon. For interconnection to an industry standard R-12 refrigerant system connector, the threaded connection 37 has 7/16 nominal diameter, 20 threads per inch UNF threads formed thereon.
However, it is to be clearly understood that the fitting 20 could be otherwise configured, without departing from the principles of the present invention. Note that the fitting 20 is molded partially within the handle 12, eliminating the need for any separate attachment member. The piercing member 16 is press-fit into the fitting 20 from opposite side of the container receiving portion 22. Alternatively, the piercing member 16 and fitting 20 could be molded together in the handle 12, and the piercing member and fitting 20 could be integrally formed.
With the tool 1 assembled as shown in
Referring specifically to
The spacer 42 includes a handle attachment portion 44 and an inner generally crescent-shaped spacer portion 46. The attachment portion 44 partially encircles the container receiving portion 26, attaching the spacer 42 to the handle 14. Note that the spacer 42 does not need to span the space 48 between the handles 12, 14, so it is more securely attached to the handles, and a person does not have to manipulate both the handles and the spacer while piercing the container 40 therebetween.
The crescent-shaped portion 46 includes an inner side surface 50 complementarily shaped relative to the container 40, and an outer side surface 52 configured for cooperative engagement with an inner side surface of the container receiving portion 26. The outer side surface 52 has a series of spaced apart abutments 54 formed thereon, which contact the container receiving portion 26.
The crescent-shaped portion 46 and the attachment portion 44 together have a generally U-shaped cross-section which is clearly seen in FIG. 6. Note that, when installed on the handle 14, the container receiving portion 26 is received in the open side of the U-shaped cross-section.
The attachment portion 44 is circumferentially offset from the crescent-shaped portion 46. In this manner, the spacer 42 accommodates a variation in thickness of the container receiving portion 26.
It may now be fully appreciated that, by disposing the piercing member 16 approximately ninety degrees from the pivot pin 30 about the container receiving portion 22, piercing of the container 40 is much easier than it would be if the piercing member were disposed adjacent or at the pivot. This is due in part to the fact that, when a person displaces the handle 12 toward the other handle 14, the piercing member 16 displaces toward the container 40 in the same direction. This eliminates any friction produced by translating lateral motion of the handles 12, 14 into longitudinal movement of the container 40.
Referring specifically to
The spacer 62 includes a handle attachment portion 64 and an inner generally annular-shaped spacer portion 66. The attachment portion 64 partially encircles the container receiving portion 26, attaching the spacer 62 to the handle 14. As with the spacer 42 described above, the spacer 62 does not need to span the space 48 between the handles 12, 14, so it is more securely attached to the handles, and a person does not have to manipulate both the handles and the spacer while piercing the container 60 therebetween.
The annular-shaped portion 66 includes an inner side surface 70 complementarily shaped relative to the container 60, and an outer side surface 72 configured for cooperative engagement with an inner side surface 68 of the container receiving portion 26. The outer side surface 72 is complementarily shaped relative to the container receiving portion 26 inner side surface 68, instead of the abutments 54 of the spacer 42. That is, the outer side surface 72 of the spacer 62 is in substantially continuous contact with the inner side surface 68 of the container receiving portion 26, whereas the outer side surface 52 of the spacer 42 is only in intermittent contact with the inner side surface 68 of the container receiving portion 26.
The annular-shaped portion 66 and the attachment portion 64 together have a generally U-shaped cross-section and, when installed on the handle 14, the container receiving portion 26 is received in the open side of the U-shaped cross-section, similar to the spacer 42 described above. However, the attachment portion 64 is not circumferentially offset from the annular-shaped portion 66. Instead, the annular-shaped portion 66 is circumferentially aligned with the attachment portion 64.
Without either of the spacers 42 or 62 installed in the handle assembly 10, the inner side surface 68 of the container receiving portion 26 accommodates a relatively large diameter container of refrigerant (not shown, but similar to the refrigerant container 60 and having a larger outer diameter). Preferably, the container is an industry standard container of R-134a refrigerant having an outer diameter of approximately three inches. The inner side surface 68 of the container receiving portion 26 is radiused to conform to the shape of the R-134a refrigerant container (i.e., the container receiving portion would have an inner radius of approximately 1.5 inches) and space it appropriately toward the piercing member 16. The other container receiving portion 22 is also radiused to conform to the shape of the R-134a refrigerant container.
Thus, three industry standard containers may be accommodated by the tool 1 by selecting an appropriate one of the spacers 42, 62, or by using the handle assembly 10 without either of the spacers.
Of course, a person skilled in the art would find it obvious, upon a reading of the above description of an embodiment of the invention, to make many modifications, additions, deletions, substitutions, and other changes to the described embodiment, and such changes are contemplated by the principles of the present invention. Accordingly, the foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims.
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|U.S. Classification||137/318, 141/329, 222/5, 81/426, 81/421, 62/292, 141/348, 222/83, 222/81, 222/83.5, 62/294, 81/423, 137/614.05, 30/443, 137/883|
|International Classification||F16L41/06, F16K43/00, B23B41/08, B67B7/48|
|Cooperative Classification||Y10T137/87877, F16L41/065, Y10T137/6123, Y10T137/87965|
|Dec 10, 2010||FPAY||Fee payment|
Year of fee payment: 8
|Dec 9, 2014||FPAY||Fee payment|
Year of fee payment: 12