US3758732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
E spring adjustment means fluid pressure actuated snap-action switch with differential and rang
Assignee: Danfoss AS
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Filing: 1972-06-26
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Granted: 1973-09-11
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Expires: 1992-06-26
Abstract
Abstract The invention relates to a snap action switch assembly comprising a snap action system which incorporates a main arm which is movable between two stops and to which the force of a pressurized working element and of an adjustable range defining spring is applied. A snap action arm is linked with said main arm and hinged in a bearing at its other end. This bearing is spring urged towards the snap action arm and the spring force thereof is likewise adjustable. The switch also comprising a contact system in which a movable contact is spring biased against a fixed contact and can be lifted by a drive element associated with the main arm.
Inventors
- 👤 Olsen J Hagedorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:50
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2657; H01H35/2664; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A snap action switch assembly comprising a housing, a main arm hinged at one end thereof to said housing, stop means engaging said arm to limit the pivotal movement thereof to a desired range, a pressure operated element biasing said arm in a first direction, a range defining spring biasing said element in a second direction opposite to said first direction, a lever having a fixed pivot point and oppositely extending arms, a snap action arm attached to one of said lever arms and being engageable with said main arm, differential spring means for biasing said lever and causing said snap action arm to be biased into engagement with said main arm, said stop means including two separately adjustable stops with either stop being adjustable to provide a limit for the movement of said main arm near its dead center position.
Claim 2
Dependent Claim
141 words
A snap action switch assembly comprising a housing, a main arm hinged at one end thereof to said housing, stop means engaging said arm to limit the pivotal movement thereof to a desired range, a pressure operated element biasing said arm in a first direction, a range defining spring biasing said element in a second direction opposite to said first direction, a lever having a fixed pivot point and oppositely extending arms, a snap action arm attached to one of said lever arms and being engageable with said main arm, differential spring means for biasing said lever and causing said snap action arm to be biased into engagement with said main arm, said stop means including two separately adjustable stops with either stop being adjustable to provide a limit for the movement of said main arm near its dead center position.
Claim 3
Dependent Claim
30 words
A snap action switch assembly according to claim 1 wherein said lever arms are of unequal length and said differential spring is attached to the longer of said lever arms.
Claim 4
Dependent Claim
26 words
A snap action switch assembly according to claim 2 wherein said range defining spring and said differential spring means extend in parallel relation to each other.
Claim 5
Dependent Claim
28 words
A snap action switch assembly according to claim 1 wherein said differential spring is attached to one of said lever arms at an angle other than ninety degrees.
Claim 6
Dependent Claim
38 words
A snap action switch assembly according to claim 1 wherein said lever arms are individually pivoted relative to said fixed pivot point, and set screw means for adjusting the position of said lever arms relative to each other.
Claim 7
Dependent Claim
56 words
A snap action switch assembly according to claim 1 including threaded backing elements for said range defining spring and for said differential spring means, set screws being threaded in said elements for adjusting said spring and said spring means, slots in said housing, said backing elements being adjacent said slots and visible therethrough as position indicators.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |