US3843855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-holddown device with diaphragm actuating switch and piston
Assignee: Individual
•
Filing: 1973-05-21
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Granted: 1974-10-22
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Expires: 1993-05-21
Abstract
Abstract This specification discloses an anti-holddown switch actuating mechanism in which a switch is operated by an increase in air pressure upon actuation of a piston-like plunger in a closed chamber, and means are provided to bleed off the increase in air pressure at a predetermined rate to insure opening of the switch a predetermined time after actuation thereof.
Inventors
- 👤 J Danielson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:28
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/50; H01H13/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
An anti-holddown switching device comprising a housing member defining a pressure chamber having opposite ends, a flexible diaphragm closing said chamber at one end thereof, a switch disposed adjacent said diaphragm at said one end of said chamber and operable by said diaphragm when the pressure on said diaphragm reaches a predetermined value, a piston in said chamber adjacent the other end thereof and movable in a direction to decrease the volume of said chamber between said piston and said diaphragm and increase the pressure therein, a passage defined in said housing member by which pressure in said chamber between said piston and said diaphragm is bled therefrom, whereby pressure created in said chamber by said piston is reduced and said diaphragm releases said switch after a predetermined time independent of the position of said piston in said chamber.
Claim 2
Dependent Claim
139 words
An anti-holddown switching device comprising a housing member defining a pressure chamber having opposite ends, a flexible diaphragm closing said chamber at one end thereof, a switch disposed adjacent said diaphragm at said one end of said chamber and operable by said diaphragm when the pressure on said diaphragm reaches a predetermined value, a piston in said chamber adjacent the other end thereof and movable in a direction to decrease the volume of said chamber between said piston and said diaphragm and increase the pressure therein, a passage defined in said housing member by which pressure in said chamber between said piston and said diaphragm is bled therefrom, whereby pressure created in said chamber by said piston is reduced and said diaphragm releases said switch after a predetermined time independent of the position of said piston in said chamber.
Claim 3
Dependent Claim
29 words
The device of claim 1 further including a second passage in said housing member providing one way communication of air into said chamber between said piston and said diaphragm.
Claim 4
Dependent Claim
32 words
The device of claim 2 further including an opening in said housing member providing communication to said second passage from a point on the other side of the piston from said diaphragm.
Claim 5
Dependent Claim
13 words
The device of claim 2 further including a filter in said second passage.
Claim 6
Dependent Claim
14 words
The device of claim 1 wherein said passage provides communication to the ambient atmosphere.
Claim 7
Dependent Claim
23 words
The device of claim 1 wherein said passage provides communication to the chamber on the other side of the piston from said diaphragm.
Claim 8
Dependent Claim
175 words
An anti-holddown switching device comprising a housing member defining a pressure chamber having opposite ends, a flexible diaphragm closing said chamber at one end thereof, a switch disposed adjacent said diaphragm at said one end of said chamber and operable by said diaphragm when the pressure on said diaphragm reaches a predetermined value, a piston in said chamber adjacent the other end thereof and movable in a direction to decrease the volume of said chamber between said piston and said diaphragm and increase the pressure therein, a first passage defined in said housing member by which pressure in said chamber between said piston and said diaphragm is bled therefrom whereby, pressure created in said chamber by said piston is reduced and said diaphragm releases said switch after a predetermined time independent of the position of said piston in said chamber, means defining a second passage providing one-way communication of air into said chamber between said piston and said diaphragm, and an opening in said housing member providing communication to said second passage from said chamber.
Claim 9
Dependent Claim
175 words
An anti-holddown switching device comprising a housing member defining a pressure chamber having opposite ends, a flexible diaphragm closing said chamber at one end thereof, a switch disposed adjacent said diaphragm at said one end of said chamber and operable by said diaphragm when the pressure on said diaphragm reaches a predetermined value, a piston in said chamber adjacent the other end thereof and movable in a direction to decrease the volume of said chamber between said piston and said diaphragm and increase the pressure therein, a first passage defined in said housing member by which pressure in said chamber between said piston and said diaphragm is bled therefrom whereby, pressure created in said chamber by said piston is reduced and said diaphragm releases said switch after a predetermined time independent of the position of said piston in said chamber, means defining a second passage providing one-way communication of air into said chamber between said piston and said diaphragm, and an opening in said housing member providing communication to said second passage from said chamber.
Claim 10
Dependent Claim
15 words
The device of claim 7 wherein said first passage provides communication to the ambient atmosphere.
Claim 11
Dependent Claim
24 words
The device of claim 7 wherein said first passage provides communication to the chamber on the other side of the piston from said diaphragm.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |