US3743801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire deflation pressure switch using a dimpling dome pressure
Assignee: Avco Corp
•
Filing: 1972-03-23
•
Granted: 1973-07-03
•
Expires: 1992-03-23
Abstract
Abstract The tire deflation pressure switch will energize a means for indicating when the air pressure in the tire drops below a predetermined point. The pressure switch is based on a sealed enclosure comprising a thin shell dome shaped diaphragm forming one contact of the switch. The other contact provides a prestress force on the dome. When exposed to the pressure within the tire, the diaphragm will buckle if the pressure is greater than a preselected value. The buckle will appear as a small dimple in a portion of the dome. Means are provided to limit the dimpling of the dome.
Inventors
- 👤 W Brobeck
- 👤 B Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:00
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A pressure switch for mounting within an external pressure chamber for monitoring the pressure within the pressure chamber, the pressre switch comprising: a thin shell dome diaphragm forming one contact of the switch; a rigid shell, said diaphragm and shell being sealed together to define a permanently sealed fluid filled chamber therebetween; a second contact secured in fixed relationship to said dome diaphragm and being engageable with said diaphragm to assert a prestress force thereon, said second contact engaging said diaphragm when external pressure surrounding the switch is less than a predetermined pressure; said dome diaphragm being responsive to the external pressure surrounding the switch wherein said diaphragm buckles away from the point of prestress force to form a dimple in a portion of said dome diaphragm when the external pressure exceeds a predetermined pressure thereby providing an open switch condition, said dome diaphragm returning to the unbuckled position to provide a closed switch position when the external pressure surrounding the switch becomes less than the predetermined pressure; means for electrically insulating said second contact from said dome diaphragm; and means connected with said diaphragm and second contact to provide an indication of the external pressure condition surrounding the switch.
Claim 2
Dependent Claim
200 words
A pressure switch for mounting within an external pressure chamber for monitoring the pressure within the pressure chamber, the pressre switch comprising: a thin shell dome diaphragm forming one contact of the switch; a rigid shell, said diaphragm and shell being sealed together to define a permanently sealed fluid filled chamber therebetween; a second contact secured in fixed relationship to said dome diaphragm and being engageable with said diaphragm to assert a prestress force thereon, said second contact engaging said diaphragm when external pressure surrounding the switch is less than a predetermined pressure; said dome diaphragm being responsive to the external pressure surrounding the switch wherein said diaphragm buckles away from the point of prestress force to form a dimple in a portion of said dome diaphragm when the external pressure exceeds a predetermined pressure thereby providing an open switch condition, said dome diaphragm returning to the unbuckled position to provide a closed switch position when the external pressure surrounding the switch becomes less than the predetermined pressure; means for electrically insulating said second contact from said dome diaphragm; and means connected with said diaphragm and second contact to provide an indication of the external pressure condition surrounding the switch.
Claim 3
Dependent Claim
46 words
The pressure switch as set forth in claim 1 in which said second contact comprises a bridge member mounted over said dome diaphragm a contact being secured to said bridge and being engageable with said dome diaphragm in the location where the dimpling deformation is desired.
Claim 4
Dependent Claim
34 words
The pressure switch as set forth in claim 1 in which said insulation means is an insulating pad on which said second contact means and dome diaphragm are mounted to provide the fixed relationship.
Claim 5
Dependent Claim
45 words
The pressure switch as set forth in claim 1 in which said rigid shell is formed with a horizontal portion, said horizontal portion providing a buckling limit whereby the dimpling deformation of the dome diaphragm is limited by said horizontal portion of said rigid shell.
Claim 6
Dependent Claim
25 words
The pressure switch as set forth in claim 4 in which said horizontal portion which limits the dimpling deformation is located within said dome diaphragm.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |