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US3789669A Expired / Lapsed US ⏱️ 0.0 years remaining

Shirt pocket refrigeration gauge

Assignee: Individual
•
Filing: 1972-06-05
•
Granted: 1974-02-05
•
Expires: 1992-06-05
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Abstract

Abstract Briefly stated, the present invention contemplates a pocket instrument useful in a refrigerator compressor system. This instrument measures the pressure on the high and low sides or stages of the compressor by using the service valve located on the compressor. Generally speaking, the instrument has an elongated chamber, a reciprocating plunger in the chamber with an indicator with a lower end having a rod connected to said lower end. The rod in turn has a connecting boss at the lower end. In the chamber there is a reciprocating piston with an upper socket for receiving said boss when the boss is pushed by hand into the socket. Spring means urge the piston downwards and connecting means connect the compressor to the said service valve so that when the boss engages the socket, changes in pressure are indicated on the indicator, and when said boss is not so engaged, the highest pressure will be indicated on the indicator.

Inventors

  • 👤 J Passman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 20:20
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/16

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 172 words
In a refrigerator compressor system, an instrument to measure the pressure on the high and low sides or stages of the compressor (8) through service valve means (10) located on the compressor, in combination: a. an elongated chamber (13); b. a reciprocating plunger (14) in said chamber with an indicator plunger with a lower end (15) having a rod (16) connected to said lower end of said indicator plunger, said rod having a boss (18) at the lower end; c. a reciprocating piston (22) in said chamber with an upper socket (20) with an aperture (19) for detachably receiving said boss (18); d. spring means (23) between the indicator plunger and said piston for urging said piston downwards; and, e. means (28, 29) for connecting said compressor to said service valve means, whereby when said boss is engaged in said socket, changes in pressure are indicated on said indicator plunger, and when said boss is not so engaged, the highest pressure will be indicated by the position of the detachable indicator plunger.
Claim 2
Dependent Claim 172 words
In a refrigerator compressor system, an instrument to measure the pressure on the high and low sides or stages of the compressor (8) through service valve means (10) located on the compressor, in combination: a. an elongated chamber (13); b. a reciprocating plunger (14) in said chamber with an indicator plunger with a lower end (15) having a rod (16) connected to said lower end of said indicator plunger, said rod having a boss (18) at the lower end; c. a reciprocating piston (22) in said chamber with an upper socket (20) with an aperture (19) for detachably receiving said boss (18); d. spring means (23) between the indicator plunger and said piston for urging said piston downwards; and, e. means (28, 29) for connecting said compressor to said service valve means, whereby when said boss is engaged in said socket, changes in pressure are indicated on said indicator plunger, and when said boss is not so engaged, the highest pressure will be indicated by the position of the detachable indicator plunger.
Claim 3
Dependent Claim 27 words
An instrument as claimed in claim 1, said spring means (23) includes calibration means (24) coacting with said rod between said lower indicator plunger and said piston.
Claim 4
Dependent Claim 29 words
An instrument as claimed in claim 2, said piston being a cup seal piston with the cup facing downwards, said socket being on the upper part of said piston.
Claim 5
Dependent Claim 17 words
An instrument as claimed in claim 3, Said spring means including a spring stop below said indicator.
Claim 6
Dependent Claim 37 words
An insturment as claimed in claim 3, said piston including a lower piston rod (28), a seal (30) at the end of said lower piston rod and a valve depression (29) for engaging said compressor valve means.

References Cited (Backward Citations)

US235791A Cited
US1126146A Cited
US1275180A Cited
US1448168A Cited
US1716399A Cited
US2049364A Cited
US3152473A Cited
US3424181A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-04 1977-08-06 1978-02-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-04 1981-08-06 1982-02-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-04 1985-08-06 1986-02-05 $7700.00 Window Closed / Lapsed

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