Patent US3038948A successfully refreshed from Google Patents.
Patent US3617665A successfully refreshed from Google Patents.
US3617665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snap-action pressure-sensitive switch with safety feature responsive to contact welding
Assignee: Eaton Corp
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Filing: 1969-12-04
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Granted: 1971-11-02
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Expires: 1989-12-04
Abstract
Abstract The pressure switch comprises a toggle switch in which a flexible switch tongue is moved by a pressure-actuated diaphragm against the force of a return spring, and a contact-carrying flexible switch blade, connected to the blade tongue, through an overcenter spring, is moved by snap-action in one direction as the blade tongue moves through the overcenter position in the opposite direction: To effect a safety function; a contact is movable by the switch tongue to engage a stationary contact after a predetermined movement of the switch tongue past the overcenter position, the switch tongue being movable despite the possibility of welding of the toggle switch contacts. Closure of the safety switch by the switch tongue in this way can be used to energize a pump in the event of failure of a water valve to close or to energize a water valve otherwise prevented from energization by welding of two of the toggle switch contacts.
Inventors
- 👤 Johannes J Berson
- 👤 Joseph Pilet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/2657; D; D06; D06F; D06F37/00; D06F37/42; D06F39/00; D06F39/08; D06F39/087; H01H3/00; H01H3/001; Y; Y10; Y10S; Y10S200/00; Y10S200/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
In a pressure-sensitive switch device, a toggle switch having a switch tongue movable through an overcenter position, a pressure-sensitive device and a return spring biasing said switch tongue in opposite directions, and a safety switch arranged to be closed by further movement of the switch tongue in the same direction after passing said overcenter position.
Claim 2
Dependent Claim
55 words
In a pressure-sensitive switch device, a toggle switch having a switch tongue movable through an overcenter position, a pressure-sensitive device and a return spring biasing said switch tongue in opposite directions, and a safety switch arranged to be closed by further movement of the switch tongue in the same direction after passing said overcenter position.
Claim 3
Dependent Claim
124 words
In a pressure-sensitive switch device, a toggle switch having a switch blade movable to move a switch contact between a first stationary contact and a second stationary contact a switch tongue and a toggle spring connected between the switch tongue and the switch blade for moving the switch blade with a snap-action in one direction as the switch tongue moves in the opposite direction through an overcenter position; a pressure-sensitive member operable to move the switch tongue against the force of a return spring, a third stationary contact and a further movable contact movable by the switch tongue into engagement with said third stationary contact after said switch tongue has passed the overcenter position in a direction against the force of the return spring.
Claim 4
Dependent Claim
124 words
In a pressure-sensitive switch device, a toggle switch having a switch blade movable to move a switch contact between a first stationary contact and a second stationary contact a switch tongue and a toggle spring connected between the switch tongue and the switch blade for moving the switch blade with a snap-action in one direction as the switch tongue moves in the opposite direction through an overcenter position; a pressure-sensitive member operable to move the switch tongue against the force of a return spring, a third stationary contact and a further movable contact movable by the switch tongue into engagement with said third stationary contact after said switch tongue has passed the overcenter position in a direction against the force of the return spring.
Claim 5
Dependent Claim
24 words
A switch device according to claim 2 wherein said further movable contact is mounted on a member connected for movement with said switch tongue.
Claim 6
Dependent Claim
40 words
A switch device according to claim 2 including a further spring for opposing movement of said further movable contact towards the third stationary contact and arranged to come into operation only after the switch tongue has passed said overcenter position.
Claim 7
Dependent Claim
17 words
A switch device according to claim 4 having means for varying the force of said further spring.
Claim 8
Dependent Claim
41 words
A switch device according to claim 2 wherein said further movable contact is movable, in response to increasing pressure, into contact with the third stationary contact despite the switch contact being welded to one of said first and second stationary contacts.
Claim 9
Dependent Claim
139 words
In a pressure-sensitive switch device, a toggle switch having a switch blade movable to move a switch contact between a first stationary contact and a second stationary contact a switch tongue and a toggle spring connected between the switch tongue and the switch blade for moving the switch blade with a snap-action in one direction as the switch tongue moves in the opposite direction through an overcenter position; a pressure-sensitive member operable to move the switch tongue against the force of a return spring, a safety switch stationary contact and a safety switch movable contact movable by the switch tongue into engagement with said safety switch stationary contact after said switch tongue has passed the overcenter position, and in the event that said switch contact has failed to move in response to the overcenter movement of the switch tongue.
Claim 10
Dependent Claim
139 words
In a pressure-sensitive switch device, a toggle switch having a switch blade movable to move a switch contact between a first stationary contact and a second stationary contact a switch tongue and a toggle spring connected between the switch tongue and the switch blade for moving the switch blade with a snap-action in one direction as the switch tongue moves in the opposite direction through an overcenter position; a pressure-sensitive member operable to move the switch tongue against the force of a return spring, a safety switch stationary contact and a safety switch movable contact movable by the switch tongue into engagement with said safety switch stationary contact after said switch tongue has passed the overcenter position, and in the event that said switch contact has failed to move in response to the overcenter movement of the switch tongue.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |