US5090206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-dampening arrangement for a refrigerator operating according to the gifford-mcmahon principle
Assignee: Balzers und Leybold Deutschland Holding AG
•
Filing: 1991-01-14
•
Granted: 1992-02-25
•
Expires: 2011-01-14
Abstract
Abstract A refrigerator operating on the Gifford-McMahon principle includes a housing defining a work chamber; a displacement member received in the housing and being movable back and forth between two dead center positions; a regenerator mounted in the displacement member; a piston attached to and extending from the displacement member; a drive cylinder disposed in the housing and being arranged for slidably receiving the piston; an arrangement for introducing a low-pressure working gas and a high-pressure working gas into the drive cylinder and the work chamber for reciprocating the displacement member between its dead center positions; a device for exerting a continuous force on the displacement meber in one of the directions of its reciprocation; and a throttle-containing conduit communicating with the drive cylinder for continuously maintaining either the low-pressure gas or the high-pressure gas in the drive cylinder dependent upon the direction in which the continuous force is oriented.
Inventors
- 👤 Wilhelm Strasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25B2309/00; F25B2309/006; F25B2500/00; F25B2500/13
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
210 words
In a refrigerator operating on the Gifford-McMahon principle, including a housing defining a work chamber; a displacement member received in said housing and being movable back and forth between two dead center positions; said displacement member having an outer diameter, a first end bounding said work chamber and an opposite, second end oriented away from said work chamber; a regenerator mounted in said displacement member; a piston attached to and extending from said second end; said piston having an outer diameter smaller than the outer diameter of said displacement member; a drive cylinder disposed in said housing and being arranged for slidably receiving said piston; and first means for introducing a low-pressure working gas and a high-pressure working gas into said drive cylinder and said work chamber for reciprocating said displacement member between said dead center positions; the improvement comprising (a) second means for exerting a continuous force on said displacement member in a direction of one of the first and second ends thereof; (b) a conduit, forming part of said first means, communicating with said drive cylinder for continuously maintaining one of said low-pressure gas and said high-pressure gas in said drive cylinder dependent upon the direction of said continuous force; and (c) a throttle contained in said conduit.
Claim 2
Dependent Claim
210 words
In a refrigerator operating on the Gifford-McMahon principle, including a housing defining a work chamber; a displacement member received in said housing and being movable back and forth between two dead center positions; said displacement member having an outer diameter, a first end bounding said work chamber and an opposite, second end oriented away from said work chamber; a regenerator mounted in said displacement member; a piston attached to and extending from said second end; said piston having an outer diameter smaller than the outer diameter of said displacement member; a drive cylinder disposed in said housing and being arranged for slidably receiving said piston; and first means for introducing a low-pressure working gas and a high-pressure working gas into said drive cylinder and said work chamber for reciprocating said displacement member between said dead center positions; the improvement comprising (a) second means for exerting a continuous force on said displacement member in a direction of one of the first and second ends thereof; (b) a conduit, forming part of said first means, communicating with said drive cylinder for continuously maintaining one of said low-pressure gas and said high-pressure gas in said drive cylinder dependent upon the direction of said continuous force; and (c) a throttle contained in said conduit.
Claim 3
Dependent Claim
43 words
A refrigerator as defined in claim 1, wherein said second means comprises a first electromagnet held stationarily in said housing and a second electromagnet mounted on said displacement member; said first and second electromagnets cooperating with one another for generating said continuous force.
Claim 4
Dependent Claim
46 words
A refrigerator as defined in claim 1, wherein said second means comprises a first permanent magnet held stationarily in said housing and a second permanent magnet mounted on said displacement member; said first and second permanent magnets cooperating with one another for generating said continuous force.
Claim 5
Dependent Claim
43 words
A refrigerator as defined in claim 1, wherein said second means comprises an electromagnet held stationarily in said housing and a soft-iron core mounted on said displacement member; said electromagnet and said soft-iron core cooperating with one another for generating said continuous force.
Claim 6
Dependent Claim
14 words
A refrigerator as defined in claim 1, further comprising means for adjusting said throttle.
Claim 7
Dependent Claim
58 words
A refrigerator as defined in claim 1, wherein said throttle is adjustable; further comprising a control device connected to said throttle and a sensor means for sensing a magnitude of acceleration of said displacement member and being connected to said control device for regulating the throttle by the control device as a function of said magnitude of acceleration.
Claim 8
Dependent Claim
75 words
A refrigerator as defined in claim 1, wherein said housing is a first housing and said conduit is a first conduit; further comprising (d) a second housing accommodating one part of said first means; said second housing being a structural unit separate and physically spaced from said first housing; (e) a second conduit, forming part of said first means, connecting said first housing with said second housing; and (f) means for cooling said second conduit.
Claim 9
Dependent Claim
30 words
A refrigerator as defined in claim 1, wherein said direction is oriented towards said first end and wherein one of the low-pressure gas and high-pressure gas is said low-pressure gas.
Claim 10
Dependent Claim
23 words
A refrigerator as defined in claim 8, wherein said second means comprises a compression spring exerting said continuous force on said displacement member.
Claim 11
Dependent Claim
30 words
A refrigerator as defined in claim 1, wherein said direction is oriented towards said second end and wherein one of the low-pressure gas and high-pressure gas is said high-pressure gas.
Claim 12
Dependent Claim
23 words
A refrigerator as defined in claim 10, wherein said second means comprises a tension spring exerting said continuous force on said displacement member.
Claim 13
Dependent Claim
22 words
A refrigerator as defined in claim 1, wherein said second means comprises a spring exerting said continuous force on said displacement member.
Claim 14
Dependent Claim
33 words
A refrigerator as defined in claim 12, wherein said spring is a coil spring surrounding said drive cylinder and having an end being in engagement with said second end of said displacement member.
Claim 15
Dependent Claim
51 words
A refrigerator as defined in claim 1, wherein said housing comprises (a) a cylindrical length portion accommodating said displacement member; (b) a terminal cap attached to said cylindrical length portion and defining said work chamber; and (c) an intermediate piece attached to said cylindrical length portion and defining said drive cylinder.
Claim 16
Dependent Claim
25 words
A refrigerator as defined in claim 14, further comprising an annular chamber surrounding said drive cylinder; said second means being accommodated in said annular chamber.
Claim 17
Dependent Claim
45 words
A refrigerator as defined in claim 15, wherein said conduit is a first conduit; said first means further comprising a second conduit maintaining communication between said regenerator and said annular chamber; and a third conduit communicating with said annular chamber and extending through said housing.
References Cited (Backward Citations)
US4352643A
Cited
US4642995A
Cited
US4761963A
Cited
US4912932A
Cited
US4954053A
Cited
US4922722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |