US4624112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive air conditioner charging station with over-ride controls
Assignee: Snap On Inc
•
Filing: 1985-08-26
•
Granted: 1986-11-25
•
Expires: 2005-08-26
Abstract
Abstract An air conditioner charging station includes oil and refrigerant reservoirs, a vacuum pump, and an electronic sequencing unit. A header conduit connected to the reservoirs and vacuum pump is connected to a cross-over conduit, which in turn is connected to conduits extending to the high and low pressure sides of an air conditioner compressor. Electrically operated valves are provided in the cross-over conduit, in a dump conduit connected to the cross-over conduit, and in branch conduits connected to the reservoirs and to the vacuum pump. An over-ride control of the cross-over valve is provided, responsive to the pressure of the high pressure side and an over-ride control is provided for cross-over valve, activated if the ambient temperature is below a predetermined level. An excessively high pressure in the high pressure side causes the closing of the valve in the refrigerant reservoir branch conduit.
Inventors
- 👤 Robert H. Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:34
CPC Classifications
F; F25; F25B; F25B45/00; B; B60; B60H; B60H1/00; B60H1/00507; B60H1/00585; F25B2345/00; F25B2345/001; F25B2345/007
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
171 words
In an air conditioner charging station for evacuating and subsequently charging an air conditioner which includes a compressor having high and low pressure sides, and wherein the charging station includes oil and refrigerant reservoirs and a vacuum pump; (a) an electrically operated dump valve, (b) conduits for connecting said oil reservoir, said refrigerant reservoir, said vacuum pump and said dump valve to the high and low pressure sides of said air conditioner, (c) electrically operated valve means in said conduits, and (d) electronic sequencing means connected with said electrically operated valves for generating signals for sequentially connecting: (i) said dump valve to said high and low pressure sides of the compressor for dumping fluid from said high and low pressure sides, (ii) said vacuum pump to said high and low pressures sides of the compressor for evacuating fluid from said high and low pressure sides, (iii) said oil reservoir only to said low pressure side, and (iv) said refrigerant reservoir simultaneously to said high and low pressure sides of the compressor.
Claim 2
Dependent Claim
171 words
In an air conditioner charging station for evacuating and subsequently charging an air conditioner which includes a compressor having high and low pressure sides, and wherein the charging station includes oil and refrigerant reservoirs and a vacuum pump; (a) an electrically operated dump valve, (b) conduits for connecting said oil reservoir, said refrigerant reservoir, said vacuum pump and said dump valve to the high and low pressure sides of said air conditioner, (c) electrically operated valve means in said conduits, and (d) electronic sequencing means connected with said electrically operated valves for generating signals for sequentially connecting: (i) said dump valve to said high and low pressure sides of the compressor for dumping fluid from said high and low pressure sides, (ii) said vacuum pump to said high and low pressures sides of the compressor for evacuating fluid from said high and low pressure sides, (iii) said oil reservoir only to said low pressure side, and (iv) said refrigerant reservoir simultaneously to said high and low pressure sides of the compressor.
Claim 3
Dependent Claim
51 words
The air conditioner charging station of claim 1, wherein said conduits include a high pressure side conduit and a low pressure side conduit for connection to the high and low pressure sides of the compressor, respectively, and a cross-over conduit connected to said high pressure side and low pressure side conduits.
Claim 4
Dependent Claim
18 words
The air conditioner charging station of claim 2, and a said electrically operated valve in said cross-over conduit.
Claim 5
Dependent Claim
49 words
The air conditioner charging station of claim 3, wherein said conduits further include a header conduit, branch conduits connected to said header conduit and to said oil reservoir, said refrigerant reservoir and said vacuum pump, respectively, and a said electrically operated valve means in each of said branch conduits.
Claim 6
Dependent Claim
23 words
The air conditioner charging station of claim 4, wherein a dump conduit having said dump valve therein is connected to said header conduit.
Claim 7
Dependent Claim
55 words
The air conditioner charging station of claim 3, and further comprising means for sensing the ambient temperature and for causing said cross-over valve to close or to remain closed when the ambient temperature is below a predetermined level, irrespective of signals of said electronic sequencing means to said cross-over valve during the refrigerant charging mode.
Claim 8
Dependent Claim
34 words
The air conditioner charging station of claim 3, and further comprising means for closing or maintaining closed said valve means in said cross-over conduit when the high pressure side pressure exceeds a predetermined amount.
Claim 9
Dependent Claim
49 words
The air conditioner charging station of claim 7, said last mentioned means comprising means for sensing the pressure at the high pressure side of the compressor and for closing or maintaining closed the cross-over valve means in the cross-over conduit when the pressure sensed is above a predetermined amount.
Claim 10
Dependent Claim
29 words
The air conditioner charging station of claim 1, and further comprising means for preventing charging of refrigerant when an excessively high pressure in the high pressure side is present.
Claim 11
Dependent Claim
38 words
The air conditioner charging system of claim 9, said last mentioned means comprising means for sensing the pressure in the high pressure side, and means including said electronic sequencing means for closing said refrigerant reservoir branch conduit valve.
Claim 12
Dependent Claim
15 words
The air conditioner charging station of claim 1, and means for heating said refrigerant reservoir.
Claim 13
Dependent Claim
29 words
The air conditioner charging system of claim 11, said last mentioned means comprising an electric blanket, and means for connecting said electric blanket to a source of electric energy.
Claim 14
Dependent Claim
32 words
The air conditioner charging system of claim 1, said dump valve having a size to accomodate refrigerant discharge to atomosphere at a pressure of up to approximately 120 psig without undue velocity.
Claim 15
Dependent Claim
118 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a cross-over conduit connecting said first and second conduits, (e) a cross-over valve in said cross-over conduit, (f) a delivery conduit connected to said refrigerant reservoir and to said cross-over conduit between said cross-over valve and said second conduit, and (g) ambient temperature responsive means for closing said cross-over valve when the ambient temperature is below a predetermined level.
Claim 16
Dependent Claim
118 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a cross-over conduit connecting said first and second conduits, (e) a cross-over valve in said cross-over conduit, (f) a delivery conduit connected to said refrigerant reservoir and to said cross-over conduit between said cross-over valve and said second conduit, and (g) ambient temperature responsive means for closing said cross-over valve when the ambient temperature is below a predetermined level.
Claim 17
Dependent Claim
130 words
The air conditioner charging station of claim 14, said cross-over valve being electrically operated, and further comprising: (a) an oil reservoir, (b) a branch conduit including an electrically operated valve connecting the oil reservoir to said delivery conduit, (c) a branch conduit connecting said refrigerant reservoir to said delivery conduit and having an electrically operated valve therein, and (d) electronic sequencing means connected to said electrically operated valves for sequentially connecting: (i) said oil reservoir only to said low pressure side, by opening the valve in the oil reservoir branch conduit and closing said other valves, and (ii) said refrigerant reservoir to said air conditioner by opening the said refrigerant reservoir branch conduit valve, closing the oil reservoir branch conduit valve, and permitting the opening of the said cross-over valve.
Claim 18
Dependent Claim
27 words
The air conditioner charging station of claim 14, and further comprising means for preventing charging of refrigerant upon an excessively high pressure in the high pressure side.
Claim 19
Dependent Claim
41 words
The air conditioner charging station of claim 15, said last mentioned means comprising means for sensing the pressure in the high pressure side, and means including said sequencing means for connecting said sensing means to said refrigerant reservoir branch conduit valve.
Claim 20
Dependent Claim
25 words
The air conditioner charging system of claim 14, and further comprising means for closing said cross-over valve upon excess pressure in the high pressure side.
Claim 21
Dependent Claim
142 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a delivery conduit, (e) means for connecting said delivery conduit to said first and second conduits, (f) means for connecting said delivery conduit to said refrigerant reservoir, (g) valve means for controlling flow of fluid through only said first mentioned conduit, and (h) ambient temperature responsive means for closing said valve means upon the occurrence of an ambient temperature below a predetermined level, whereby fluid flow in the first conduit is prevented so as to permit charging only to the low pressure side.
Claim 22
Dependent Claim
142 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a delivery conduit, (e) means for connecting said delivery conduit to said first and second conduits, (f) means for connecting said delivery conduit to said refrigerant reservoir, (g) valve means for controlling flow of fluid through only said first mentioned conduit, and (h) ambient temperature responsive means for closing said valve means upon the occurrence of an ambient temperature below a predetermined level, whereby fluid flow in the first conduit is prevented so as to permit charging only to the low pressure side.
Claim 23
Dependent Claim
27 words
An air conditioner charging station in accordance with claim 19, and further comprising a dump valve, and means for connecting said dump valve to said delivery conduit.
Claim 24
Dependent Claim
134 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a delivery conduit, (e) means for connecting said delivery conduit to said first and second conduits, (f) means for connecting said delivery conduit to said refrigerant reservoir, (g) valve means for controlling flow of fluid through only said first mentioned conduit, and (h) means for operating said valve means for preventing flow of fluid in said first mentioned conduit when a predetermined high pressure is present in the high pressure side of the air conditioner.
Claim 25
Dependent Claim
134 words
An air conditioner charging station for supplying a charge of refrigerant to an air conditioner having high and low pressure sides, said charging station comprising: (a) a refrigerant reservoir, (b) a conduit for connection to the high pressure side of the air conditioner, (c) a second conduit for connection to the low pressure side of the air conditioner, (d) a delivery conduit, (e) means for connecting said delivery conduit to said first and second conduits, (f) means for connecting said delivery conduit to said refrigerant reservoir, (g) valve means for controlling flow of fluid through only said first mentioned conduit, and (h) means for operating said valve means for preventing flow of fluid in said first mentioned conduit when a predetermined high pressure is present in the high pressure side of the air conditioner.
Claim 26
Dependent Claim
40 words
An air conditioner charging station as set forth in claim 21, said last mentioned means comprising means for sensing the pressure in the high pressure side, and for closing said valve means upon the occurrence of such predetermined high pressure.
Claim 27
Dependent Claim
27 words
An air conditioner charging station in accordance with claim 21, and further comprising a dump valve, and means for connecting said dump valve to said delivery conduit.
References Cited (Backward Citations)
US2499170A
Cited
US3303663A
Cited
US3400552A
Cited
US3695055A
Cited
US3785163A
Cited
US3873289A
Cited
US4245480A
Cited
US4261178A
Cited
US4285206A
Cited
US4364236A
Cited
US4513578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |