WO1997039295A1 - Hand-powered piston refrigerant charging pump - Google Patents

Hand-powered piston refrigerant charging pump Download PDF

Info

Publication number
WO1997039295A1
WO1997039295A1 PCT/US1997/001756 US9701756W WO9739295A1 WO 1997039295 A1 WO1997039295 A1 WO 1997039295A1 US 9701756 W US9701756 W US 9701756W WO 9739295 A1 WO9739295 A1 WO 9739295A1
Authority
WO
WIPO (PCT)
Prior art keywords
push rod
actuating arm
cylindrical housing
arm
charging device
Prior art date
Application number
PCT/US1997/001756
Other languages
French (fr)
Inventor
Phil Trigiani
Original Assignee
Kroll, Michael, I.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kroll, Michael, I. filed Critical Kroll, Michael, I.
Priority to AU22563/97A priority Critical patent/AU2256397A/en
Publication of WO1997039295A1 publication Critical patent/WO1997039295A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/001—Charging refrigerant to a cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves

Definitions

  • the instant invention relates generally to injector infusers and more specifically it relates to an improved charging device for air conditioning and refrigeration systems.
  • a primary object of the present invention is to provide an improved charging device that will overcome the shortcomings of the prior art devices.
  • Another object is to provide an improved charging device that will eliminate the need to use a refrigerant when a lubricant is infused into air conditioning and refrigeration systems.
  • An additional object is to provide a an improved charging device in which the infusion process when expedited is safer since there is no new refrigerant added, therefore any refrigerant loss through leakage is
  • a further object is to provide an improved charging device that is simple and easy to use.
  • a still further object is to provide an improved charging device that is economical in cost to manufacture.
  • FIGURE 1 is a perspective view of the prior art, showing a pressurized
  • FIGURE 2 is a perspective view of the instant invention, showing a liquid infused into the air conditioning /refrigeration system.
  • FIGURE 3 is an enlarged perspective view of the instant invention per se.
  • FIGURE 4 is a cross sectional view taken along line 4-4 in Figure 3, showing the movement limiting assembly in greater detail.
  • FIGURE 5 is an enlarged perspective view of the area indicated by arrow 5 in Figure 3, showing the ratchet mechanism in greater detail.
  • FIGURE 6 is a further enlarged perspective view taken in the direction
  • gauges 12 inside connected to gauges 12 is fluidly coupled via a line 14 to a service
  • charging device 20 comprising a vessel 22 for holding a liquid 24 therein.
  • a component 26 on the vessel 22 is for allowing the liquid 24 to exit therefrom.
  • a facility 28 on the vessel 22 is for dispensing the liquid 24 in controlled
  • the vessel 22 includes a cylindrical housing 30 opened at both ends.
  • External threads 32 can be formed on the first open end 33 of the cylindrical
  • An optional cap 34 having internal threads 36 can thread onto
  • the liquid exit component 26 is a connector 38 centrally formed on the cap 34.
  • connector 38 can typically engage with an end of an elongated tube 40 that can fluidly connect with the service fitting 16 of the air conditioning /refrigeration
  • the dispensing facility 28 consists of a disc shaped push plate 42 which
  • a push rod 44 is on the push plate. The push rod 44 extends
  • An assembly 46 is for driving the push rod 44 into the cylindrical housing 30 with
  • the driving assembly 46 includes a fixed arm 48 that extends
  • a pivot arm 50 extends at an angle downwardly from a second lower side of the
  • a fulcrum pin 54 connects a free end of the pivot arm 50 to one
  • a ratchet mechanism 56 on the push rod 44 is operable by the
  • a universal joint 58 is between a bottom surface
  • the push rod 44 will always maintain a perpendicular position with respect to the actuating arm
  • a stationary hand grip 60 is on a free end of the fixed arm 48.
  • a movable hand grip 60 is on a free end of the fixed arm 48.
  • hand grip 62 is on a free end of the actuating arm 52. A person can grasp the stationary hand grip 60 and the movable hand grip 62 with one hand and
  • the ratchet mechanism 56 as best seen in Figure 5, consists of a plurality of sloping ratchet teeth 64 extending along one side of the push rod
  • the actuating arm 52 has a transverse aperture 66 therethrough, so that
  • the push rod 44 can extend through the aperture 66.
  • actuating arm 52 is to engage with the sloping ratchet teeth 64, to move the push rod 44 up into the second open end 43 of the cylindrical housing 30.
  • right angle handle 70 is formed on a free end of the push rod 44 to manually
  • the driving assembly 46 further includes an assemblage 72 for limiting
  • the limiting movement assembly 72 includes a first retainer pin 74 extending downwardly from the fixed arm 48.
  • a second retainer pin 76 extends upwardly from the
  • a spring 78 extends between the first retainer pin 74 and the second retainer pin 76 to normally bias the actuating arm 52 away from the fixed arm 48.
  • the fixed arm 48 is an inverted U-shaped channel 80 having a pair of spaced apart vertical slots 82 in each side wall 84 of the U-shaped channel 80
  • the actuating arm 52 is a U-shaped channel
  • Each plate 92 has a pair of hooks 94 on each short end.
  • each plate 92 can engage with the slots 82 in each side wall 84 of the fixed arm 48.
  • each plate 92 can engage with the slots 88 in each side wall 90 of the actuating arm 52 to limit the movement of the actuating arm 52.
  • the liquid 24, as shown in Figure 2 can be an oil lubricant, a fluorescent additive or other liquid substances. A refrigerant is not used in the device 20.
  • the liquid 24 can be added by the device 20 to sealed, pressurized or discharged automotive, industrial, commercial and domestic air conditioning or refrigeration systems. Other dispensing facilities, not
  • the push rod 44 can be used to activate the push rod 44, such as an air operated or hydraulic ram, a compressed gas unit, an electric motor or by other means.
  • the cylindrical housing 30 can be substituted with a pre-filled disposable sealed cylindrical cartridge that holds the lubricant/ additive.
  • the pre-filled disposable sealed cylindrical cartridge is threaded or attached in some manner to the rest of the device 20 and will operate identically as the

Abstract

An improved charging device (20) comprising a vessel (22) for holding a liquid (24) therein. A component (26) on the vessel (22) is for allowing the liquid (24) to exit therefrom. A facility (28) on the vessel (22) is for dispensing the liquid (24) in controlled amounts through the exit component (26).

Description

HAND POWERED PISTON REFRIGERANT CHARGING PUMP
Description
Technical Field
The instant invention relates generally to injector infusers and more specifically it relates to an improved charging device for air conditioning and refrigeration systems.
Disclosure of the Invention
A primary object of the present invention is to provide an improved charging device that will overcome the shortcomings of the prior art devices.
Another object is to provide an improved charging device that will eliminate the need to use a refrigerant when a lubricant is infused into air conditioning and refrigeration systems. An additional object is to provide a an improved charging device in which the infusion process when expedited is safer since there is no new refrigerant added, therefore any refrigerant loss through leakage is
minimized.
A further object is to provide an improved charging device that is simple and easy to use.
A still further object is to provide an improved charging device that is economical in cost to manufacture.
Further objects of the invention will appear as the description proceeds.
Brief Description of the Drawing Figures
Various other objects, features and attendant advantages of the present
invention will become more fully appreciated as the same becomes better understood when considered in conjunction with the accompanying
drawings, in which like reference characters designate the same or similar
parts throughout the several views, and wherein;
FIGURE 1 is a perspective view of the prior art, showing a pressurized
tank with a refrigerant to propel lubricants into an air conditioning/
refrigeration system.
FIGURE 2 is a perspective view of the instant invention, showing a liquid infused into the air conditioning /refrigeration system.
FIGURE 3 is an enlarged perspective view of the instant invention per se.
FIGURE 4 is a cross sectional view taken along line 4-4 in Figure 3, showing the movement limiting assembly in greater detail. FIGURE 5 is an enlarged perspective view of the area indicated by arrow 5 in Figure 3, showing the ratchet mechanism in greater detail.
FIGURE 6 is a further enlarged perspective view taken in the direction
of arrow 6 in Figure 3 with parts broken away, showing the universal joint between the push rod and push plate.
List of Reference Numbers in the Drawing Figures
10 pressurized tank (prior art)
12 gauges to 10
14 line between 12 and 16
16 service fitting of 18
18 air conditioning /refrigeration system
20 improved charging device
22 vessel of 20
24 liquid in 22
26 liquid exit component of 20 dispensing facility of 20
cylindrical housing of 22
external threads on 30
first open end of 30
optional cap of 22
internal threads on 34
connector for 26
elongated tube between 38 and 16
disc shaped push plate of 28
second open end of 30 push rod on 42
driving assembly of 28
fixed arm of 46 on 30
pivot arm of 46 on 30
actuating arm of 46
fulcrum pin of 46
ratchet mechanism of 46
universal joint between 42 and 44
stationary hand grip on 48
movable hand grip on 52 sloping ratchet teeth of 56
transverse aperture in 52
hinged catch of 56
right angle handle on 44
limiting movement assemblage of 46
first retainer pin of 72 on 48
second retainer pin of 72 on 52
spring of 72 between 74 and 76
inverted U-shaped channel for 48
vertical slot in 84 84 side wall of 80
86 U-shaped channel for 52
88 vertical slot in 90
90 side wall of 86
92 rectangular plate of 72
94 hook on 92
Detailed Description of the Preferred Embodiment
Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, Figure 1
illustrates the prior art. A pressurized tank 10 with refrigerant and /or oil
inside connected to gauges 12 is fluidly coupled via a line 14 to a service
fitting 16 of an air conditioning/ refrigeration system 18.
The instant invention shown in Figures 2 and 3, is an improved
charging device 20 comprising a vessel 22 for holding a liquid 24 therein. A
component 26 on the vessel 22 is for allowing the liquid 24 to exit therefrom. A facility 28 on the vessel 22 is for dispensing the liquid 24 in controlled
amounts through the exit component 26.
The vessel 22 includes a cylindrical housing 30 opened at both ends.
External threads 32 can be formed on the first open end 33 of the cylindrical
housing 30. An optional cap 34 having internal threads 36 can thread onto
the external threads 32 on the cylindrical housing 30. The liquid exit component 26 is a connector 38 centrally formed on the cap 34. The
connector 38 can typically engage with an end of an elongated tube 40 that can fluidly connect with the service fitting 16 of the air conditioning /refrigeration
system 18.
The dispensing facility 28 consists of a disc shaped push plate 42 which
snugly fits into the second open end 43 of the cylindrical housing 30 in a
sliding manner. A push rod 44 is on the push plate. The push rod 44 extends
outwardly from the second open end 43 of the cylindrical housing 30. An assembly 46 is for driving the push rod 44 into the cylindrical housing 30 with
elevated levels of thrust, so that the push plate 42 will force the liquid 24 out
of the liquid exit component 26.
The driving assembly 46 includes a fixed arm 48 that extends
horizontally from a first lower side of the cylindrical housing 30. A pivot arm 50 extends at an angle downwardly from a second lower side of the
cylindrical housing 30 opposite from the fixed arm 48. An actuating arm 52 is provided. A fulcrum pin 54 connects a free end of the pivot arm 50 to one
end of the actuating arm 52, so that the actuating arm 52 extends below the
fixed arm 48. A ratchet mechanism 56 on the push rod 44 is operable by the
actuating arm 52, when the actuating arm 52 is manually pivoted towards the fixed arm 48. The push rod 44 will move up into the second open end 43 of the cylindrical housing 30.
A universal joint 58, as shown in Figure 6, is between a bottom surface
of the push plate 42 and a top end of the push rod 44. The push rod 44 will always maintain a perpendicular position with respect to the actuating arm
52. A stationary hand grip 60 is on a free end of the fixed arm 48. A movable
hand grip 62 is on a free end of the actuating arm 52. A person can grasp the stationary hand grip 60 and the movable hand grip 62 with one hand and
squeeze together, so as to operate the ratchet mechanism 56.
The ratchet mechanism 56, as best seen in Figure 5, consists of a plurality of sloping ratchet teeth 64 extending along one side of the push rod
44. The actuating arm 52 has a transverse aperture 66 therethrough, so that
the push rod 44 can extend through the aperture 66. A hinged catch 68 on the
actuating arm 52 is to engage with the sloping ratchet teeth 64, to move the push rod 44 up into the second open end 43 of the cylindrical housing 30. A
right angle handle 70 is formed on a free end of the push rod 44 to manually
manipulate the push rod 44, to release the hinged catch 68 from the sloping ratchet teeth 64. The driving assembly 46 further includes an assemblage 72 for limiting
movement of the actuating arm 52 towards the fixed arm 48, to slowly operate the ratchet mechanism 56. The limiting movement assembly 72, as best seen in Figure 4, includes a first retainer pin 74 extending downwardly from the fixed arm 48. A second retainer pin 76 extends upwardly from the
actuating arm 52 directly below the first retainer pin 74. A spring 78 extends between the first retainer pin 74 and the second retainer pin 76 to normally bias the actuating arm 52 away from the fixed arm 48.
The fixed arm 48 is an inverted U-shaped channel 80 having a pair of spaced apart vertical slots 82 in each side wall 84 of the U-shaped channel 80
adjacent the first retainer pin 74. The actuating arm 52 is a U-shaped channel
86 having a pair of spaced apart vertical slots 88 in each side wall 90 of the U-
shaped channel 86 adjacent the second retainer pin 76. A pair of rectangular plates 92 are provided. Each plate 92 has a pair of hooks 94 on each short end.
The hooks 94 on a first short end of each plate 92 can engage with the slots 82 in each side wall 84 of the fixed arm 48. The hooks 94 on a second short end
of each plate 92 can engage with the slots 88 in each side wall 90 of the actuating arm 52 to limit the movement of the actuating arm 52. The liquid 24, as shown in Figure 2, can be an oil lubricant, a fluorescent additive or other liquid substances. A refrigerant is not used in the device 20. The liquid 24 can be added by the device 20 to sealed, pressurized or discharged automotive, industrial, commercial and domestic air conditioning or refrigeration systems. Other dispensing facilities, not
shown in the drawings, can be used to activate the push rod 44, such as an air operated or hydraulic ram, a compressed gas unit, an electric motor or by other means.
The cylindrical housing 30 can be substituted with a pre-filled disposable sealed cylindrical cartridge that holds the lubricant/ additive. The pre-filled disposable sealed cylindrical cartridge is threaded or attached in some manner to the rest of the device 20 and will operate identically as the
cylindrical housing 30.

Claims

IMPROVED CHARGING DEVICEClaims
1. An improved charging device comprising: a) a vessel for holding a liquid therein; b) means on said vessel for allowing the liquid to exit therefrom; and c) means on said vessel for dispensing the liquid in controlled
amounts through said exit means.
2. An improved charging device as recited in Claim 1, wherein said
vessel includes:
a) a cylindrical housing opened at both ends, with external threads formed on the first open end of said cylindrical housing; and b) an optional cap having internal threads which can thread onto said external threads on said cylindrical housing.
3. An improved charging device as recited in Claim 2, wherein said liquid exit means includes a connector centrally formed on said cap, whereby said connector can typically engage with an end of an elongated tube that can
fluidly connect with a service fitting of an air conditioning /refrigeration system.
4. An improved charging device as recited in Claim 2, wherein said dispensing means includes: a) a disc shaped push plate which snugly fits into the second open end of said cylindrical housing in a sliding manner; b) a push rod on said push plate, whereby said push rod extends outwardly from the second open end of said cylindrical housing; and c) means for driving said push rod into said cylindrical housing with elevated levels of thrust, so that said push plate will force the liquid out of said liquid exit means.
5. An improved charging device as recited in Claim 4, wherein said
driving means includes:
a) a fixed arm extending horizontally from a first lower side of said
cylindrical housing;
b) a pivot arm extending at an angle downwardly from a second lower side of said cylindrical housing opposite from said fixed arm; c) an actuating arm;
d) a fulcrum pin connecting a free end of said pivot arm to one end of
said actuating arm, so that said actuating arm extends below said
fixed arm; and e) a ratchet mechanism on said push rod operable by said actuating arm
when said actuating arm is manually pivoted towards said fixed arm, so that said push rod will move up into the second open end of said cylindrical housing.
6. An improved charging device as recited in Claim 5, wherein said driving means further includes a universal joint between a bottom surface of
said push plate and a top end of said push rod, so that said push rod will
always maintain a perpendicular position with respect to said actuating arm.
7. An improved charging device as recited in Claim 5, wherein said driving means further includes:
a) a stationary hand grip on a free end of said fixed arm; and
b) a movable hand grip on a free end of said actuating arm, so that a person can grasp said stationary hand grip and said movable hand
grip with one hand and squeeze together, so as to operate said ratchet mechanism.
8. An improved charging device as recited in Claim 5, wherein said
ratchet mechanism includes:
a) a plurality of sloping ratchet teeth extending along one side of said
push rod; b) said actuating arm having a transverse aperture therethrough, so
that said push rod can extend through said aperture; c) a hinged catch on said actuating arm to engage with said sloping
ratchet teeth to move said push rod up into the second open end of
said cylindrical housing; and d) a right angle handle formed on a free end of said push rod to
manually manipulate said push rod to release said hinged catch
from said sloping ratchet teeth.
9. An improved charging device as recited in Claim 5, wherein said driving means further includes means for limiting movement of said
actuating arm towards said fixed arm to slowly operate said ratchet
mechanism.
10. An improved charging device as recited in Claim 9, wherein said
limiting movement means includes:
a) a first retainer pin extending downwardly from said fixed arm; b) a second retainer pin extending upwardly from said actuating arm directly below said first retainer pin;
c) a spring extending between said first retainer pin and said second retainer pin to normally bias said actuating arm away from said fixed arm;
d) said fixed arm being an inverted U-shaped channel having a pair of
spaced apart vertical slots in each side wall of said U- shaped channel adjacent said first retainer pin;
e) said actuating arm being a U-shaped channel having a pair of spaced apart vertical slots in each side wall of said U-shaped channel
adjacent said second retainer pin; and f) a pair of rectangular plates, each said plate having a pair of hooks on each short end, so that said hooks on a first short end of each said
plate can engage with said slots in each said side wall of said fixed arm, while said hooks on a second short end of each said plate can engage with said slots in each said side wall of said actuating arm to limit the movement of said actuating arm.
11. An improved charging device comprising: a) a vessel for holding a liquid therein, wherein said vessel includes a cylindrical housing opened at both ends, with external threads formed on the first open end of said cylindrical housing and an optional cap having internal threads which can thread onto said external threads on said cylindrical housing; b) means on said vessel for allowing the liquid to exit therefrom; and c) means on said vessel for dispensing the liquid in controlled amounts through said exit means.
12. An improved charging device as recited in Claim 11, wherein said liquid exit means includes a connector centrally formed on said cap, whereby
said connector can typically engage with an end of an elongated tube that can
fluidly connect with a service fitting of an air conditioning /refrigeration system.
13. An improved charging device as recited in Claim 12, wherein said
dispensing means includes: a) a disc shaped push plate which snugly fits into the second open end
of said cylindrical housing in a sliding manner; b) a push rod on said push plate, whereby said push rod extends outwardly from the second open end of said cylindrical housing; and
c) means for driving said push rod into said cylindrical housing with
elevated levels of thrust, so that said push plate will force the liquid out of said liquid exit means.
14. An improved charging device as recited in Claim 13, wherein said driving means includes: a) a fixed arm extending horizontally from a first lower side of said cylindrical housing;
b) a pivot arm extending at an angle downwardly from a second lower side of said cylindrical housing opposite from said fixed arm; c) an actuating arm; d) a fulcrum pin connecting a free end of said pivot arm to one end of said actuating arm, so that said actuating arm extends below said fixed arm; and e) a ratchet mechanism on said push rod operable by said actuating arm when said actuating arm is manually pivoted towards said fixed arm, so that said push rod will move up into the second open end of said cylindrical housing.
15. An improved charging device as recited in Claim 14, wherein said driving means further includes a universal joint between a bottom surface of said push plate and a top end of said push rod, so that said push rod will always maintain a perpendicular position with respect to said actuating arm.
16. An improved charging device as recited in Claim 15, wherein said
driving means further includes:
a) a stationary hand grip on a free end of said fixed arm; and
b) a movable hand grip on a free end of said actuating arm, so that a person can grasp said stationary hand grip and said movable hand
grip with one hand and squeeze together, so as to operate said ratchet
mechanism.
17. An improved charging device as recited in Claim 16, wherein said
ratchet mechanism includes:
a) a plurality of sloping ratchet teeth extending along one side of said push rod; b) said actuating arm having a transverse aperture therethrough, so
that said push rod can extend through said aperture; c) a hinged catch on said actuating arm to engage with said sloping ratchet teeth to move said push rod up into the second open end of said cylindrical housing; and
d) a right angle handle formed on a free end of said push rod to
manually manipulate said push rod to release said hinged catch
from said sloping ratchet teeth.
18. An improved charging device as recited in Claim 17, wherein said driving means further includes means for limiting movement of said actuating arm towards said fixed arm to slowly operate said ratchet mechanism.
19. An improved charging device as recited in Claim 18, wherein said limiting movement means includes: a) a first retainer pin extending downwardly from said fixed arm; b) a second retainer pin extending upwardly from said actuating arm directly below said first retainer pin; c) a spring extending between said first retainer pin and said second retainer pin to normally bias said actuating arm away from said fixed arm; d) said fixed arm being an inverted U-shaped channel having a pair of spaced apart vertical slots in each side wall of said U- shaped channel adjacent said first retainer pin; e) said actuating arm being a U-shaped channel having a pair of spaced apart vertical slots in each side wall of said U-shaped channel adjacent said second retainer pin; and f) a pair of rectangular plates, each said plate having a pair of hooks on
each short end, so that said hooks on a first short end of each said
plate can engage with said slots in each said side wall of said fixed
arm, while said hooks on a second short end of each said plate can engage with said slots in each said side wall of said actuating arm to limit the movement of said actuating arm.
PCT/US1997/001756 1996-04-17 1997-02-02 Hand-powered piston refrigerant charging pump WO1997039295A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU22563/97A AU2256397A (en) 1996-04-17 1997-02-02 Hand-powered piston refrigerant charging pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/634,025 1996-04-17
US08/634,025 US5699678A (en) 1996-04-17 1996-04-17 Charging device

Publications (1)

Publication Number Publication Date
WO1997039295A1 true WO1997039295A1 (en) 1997-10-23

Family

ID=24542131

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/001756 WO1997039295A1 (en) 1996-04-17 1997-02-02 Hand-powered piston refrigerant charging pump

Country Status (4)

Country Link
US (1) US5699678A (en)
AU (1) AU2256397A (en)
CA (1) CA2221151A1 (en)
WO (1) WO1997039295A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0861190A1 (en) * 1996-09-18 1998-09-02 Phil Trigiani Method and apparatus for charging pressurized systems
EP0861190A4 (en) * 1996-09-18 1999-02-03 Phil Trigiani Method and apparatus for charging pressurized systems

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Publication number Publication date
CA2221151A1 (en) 1997-10-23
AU2256397A (en) 1997-11-07
US5699678A (en) 1997-12-23

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