Patent US3750082A successfully refreshed from Google Patents.
US3750082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug assembly with resistor
Assignee: Danfoss AS
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Filing: 1972-06-15
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Granted: 1973-07-31
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Expires: 1992-06-15
Abstract
Abstract The invention relates to a plug assembly for a small refrigerating unit or the like which plug assembly is equipped with one or more PTC resistors. Thermally loaded, ceramic resistors such as PTC resistors are generally brittle and have the characteristics of a substantial temperature expansion coefficient while being relatively weak structurally. The plug assembly accommodates one or more PTC resistors with a resistor holding device in which resiliently biased electrical contacts hold the resistors firmly in fixed positions while permitting the resistors to expand freely upon being heated without incurring stresses which would cause breakage.
Inventors
- 👤 P Petersen
- 👤 H Pedersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:44
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/14; H01C1/1406; H01C1/01; H01C1/014; H01C7/00; H01C7/02; H01C7/022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
Circuit apparatus for mounting a thermally loaded ceramic resistor such as a PTC resistor, comprising, a housing having groove means, a disc member made of a heat resistant material and being mounted in said housing, said disc member being mounted in said groove means and having a central opening, a resistor having a greater thickness than said disc member and a profile similar in shape to said Opening, said resistor loosely disposed in said opening, said resistor having side surfaces generally parallel to said disc member, and spring loaded contact means engaging at least one of said resistor side surfaces to maintain said resistor in its mounted position.
Claim 2
Dependent Claim
108 words
Circuit apparatus for mounting a thermally loaded ceramic resistor such as a PTC resistor, comprising, a housing having groove means, a disc member made of a heat resistant material and being mounted in said housing, said disc member being mounted in said groove means and having a central opening, a resistor having a greater thickness than said disc member and a profile similar in shape to said Opening, said resistor loosely disposed in said opening, said resistor having side surfaces generally parallel to said disc member, and spring loaded contact means engaging at least one of said resistor side surfaces to maintain said resistor in its mounted position.
Claim 3
Dependent Claim
15 words
Circuit apparatus according to claim 1 wherein only said resistor side surfaces are ground surfaces.
Claim 4
Dependent Claim
142 words
Circuit apparatus for mounting a thermally loaded ceramic resistor such as a PTC resistor, comprising a housing, a disc member made of a heat resistant material and being mounted in said housing, said disc member having a central opening, a resistor having a profile similar in shape to said opening and being loosely disposed in said opening, said resistor having side surfaces generally parallel to said disc member, and spring loaded contact means engaging at least one of said resistor side surfaces to maintain said resistor in its mounted position, said contact means comprising a pair of contacts for each of said side surfaces, the contacts of each said pair of contacts being offset with respect to each other and each pair of contacts on opposite sides of each pair of said surfaces being offset from each other by approximately 90* .
Claim 5
Dependent Claim
142 words
Circuit apparatus for mounting a thermally loaded ceramic resistor such as a PTC resistor, comprising a housing, a disc member made of a heat resistant material and being mounted in said housing, said disc member having a central opening, a resistor having a profile similar in shape to said opening and being loosely disposed in said opening, said resistor having side surfaces generally parallel to said disc member, and spring loaded contact means engaging at least one of said resistor side surfaces to maintain said resistor in its mounted position, said contact means comprising a pair of contacts for each of said side surfaces, the contacts of each said pair of contacts being offset with respect to each other and each pair of contacts on opposite sides of each pair of said surfaces being offset from each other by approximately 90* .
Claim 6
Dependent Claim
25 words
Circuit apparatus according to claim 1 wherein said contact means comprises spring loaded contact means engaging opposite ones of said side surfaces of said resistor.
Claim 7
Dependent Claim
33 words
Circuit apparatus according to claim 1 wherein said contact means comprises a friction loaded contact on one side of said resistor and a spring loaded contact on the other side of said resistor.
Claim 8
Dependent Claim
43 words
Circuit apparatus according to claim 3 including a pair of said disc members mounted in said housing in spaced parallel relation to each other, each of said disc members having a resistor mounted therein, said spring loaded contact means being between said resistors.
Claim 9
Dependent Claim
25 words
Circuit apparatus according to claim 6 including firction loaded contact means between the outer sides of said resistors and inner wall means of said housing.
Claim 10
Dependent Claim
43 words
Circuit apparatus according to claim 1 wherein said housing comprises mating parts with groove means in at least one of said parts, said disc member being disposed in said groove means and held in place solely by the joining of said mating parts.
Claim 11
Dependent Claim
23 words
Circuit apparatus according to claim 8 including rail means disposed in said groove means, said contact means being supported on said rail means.
Claim 12
Dependent Claim
12 words
Circuit apparatus according to claim 1 wherein said housing includes venting orifices.
Claim 13
Dependent Claim
17 words
Circuit apparatus according to claim 1 wherein said disc member is made of an electrically insulating material.
Claim 14
Dependent Claim
19 words
Circuit apparatus according to claim 1 wherein said disc member is made of a glass fiber reinforced aromatic polyamide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |