Patent US3898997A successfully refreshed from Google Patents.
US3898997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control arrangement for a damper
Assignee: American Air Filter Co Inc
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Filing: 1974-03-18
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Granted: 1975-08-12
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Expires: 1994-03-18
Abstract
Abstract A damper control arrangement wherein a damper blade opens and closes a flow through orifice in response to selective moving means adapted to move the damper blade is preselected distance from the orifice opening varying the opening of the orifice for a predetermined period of time prior to moving the damper blade to a fully open position resulting in the orifice obtaining its maximum opening area.
Inventors
- 👤 Jr Wilson E Kelley
- 👤 Robert Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:54
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86445
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
308 words
A damper control arrangement comprising: a. a housing wall having an orifice therein; b. a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice; c. damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall; d. actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) said first control circuit includes a normally open switch means closed to a first position, said switch means in said first closed position being in series with two branch circuits in parallel, the first of said branch circuits including a normally closed first contact switch and a first contactor actuating means whereby said first contactor actuating means actuates said actuating means to a first position upon closing said normally opeN switch, the second of said branches including a normally open limit switch and a first contact relay which operates said normally closed first contact switch, said normally open limit switch being operable in response to selected movement of said damper blade whereby when said damper blade moves a preselected distance said limit switch is actuated to a closed position thereby energizing said contact relay which opens said normally closed first contact switch, de-actuating said first contactor actuating means which in turn de-actuates said actuating means to its original position; and, (2) said second control circuit includes said normally open switch means closed to a second position and a second contactor actuating means whereby said second contactor actuating means actuates said actuating means to a second position upon closing said normally open switch means.
Claim 2
Dependent Claim
308 words
A damper control arrangement comprising: a. a housing wall having an orifice therein; b. a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice; c. damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall; d. actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) said first control circuit includes a normally open switch means closed to a first position, said switch means in said first closed position being in series with two branch circuits in parallel, the first of said branch circuits including a normally closed first contact switch and a first contactor actuating means whereby said first contactor actuating means actuates said actuating means to a first position upon closing said normally opeN switch, the second of said branches including a normally open limit switch and a first contact relay which operates said normally closed first contact switch, said normally open limit switch being operable in response to selected movement of said damper blade whereby when said damper blade moves a preselected distance said limit switch is actuated to a closed position thereby energizing said contact relay which opens said normally closed first contact switch, de-actuating said first contactor actuating means which in turn de-actuates said actuating means to its original position; and, (2) said second control circuit includes said normally open switch means closed to a second position and a second contactor actuating means whereby said second contactor actuating means actuates said actuating means to a second position upon closing said normally open switch means.
Claim 3
Dependent Claim
156 words
The damper control arrangement of claim 1 wherein said second branch circuit of said first control circuit includes a normally closed second contact switch operable in response to a second contact relay, a timing element, and a normally open third contact switch operable to a closed position in response to energization of said first contact relay, said timing element and third contact switch being in parallel with said first contact relay, said first control circuit further including a third branch circuit in parallel with said first and second branch circuits, said third branch circuit including said second contact relay and a normally open timing switch, said timing switch being operable to a closed position in response to actuation by said timing element whereby upon energizing said second contact relay said normally closed second contact switch opens thereby de-energizing said first contact relay and closing said normally closed first contact switch, actuating said first contactor actuating means.
Claim 4
Dependent Claim
166 words
The damper control arrangement of claim 1 wherein said damper blade moving means includes a housing having a plurality of openings and a slidably mounted piston therein with a transversely extending rod attached at one end to said piston and at the other end to said damper blade, said rod extending through one of said openings in said housing for slidable movement therethrough in a substantially fluid tight communication, said piston being of substantially the same geometric configuration and substantially the same cross sectional area as the inside configuration of said housing whereby said piston separates said housing into two compartments in substantially non-flow through relation; at least two of said openings being disposed in substantially opposite ends of said housing in fluid communication with fluid pressure means whereby fluid pressure on one side of said piston actuates said damper blade for movement in one direction and fluid pressure on the other side of said piston actuates said damper blade for movement in an opposite direction.
Claim 5
Dependent Claim
53 words
The damper control arrangement of claim 1 wherein said damper blade includes a baffle means positioned thereon in cooperative arrangement with said orifice to provide a flow through opening defined by a edge of said orifice and said baffle means of constant cross section during a predetermined portion of the damper blade stroke.
Claim 6
Dependent Claim
213 words
A damper control arrangement comprising: a. a housing wall having an orifice therein; b. a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice; c. damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall; d. actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) said first control circuit includes means for energiziNg the actuating means to a position to cause the selective opening of the orifice by moving said damper blade a preselected distance, means for de-energizing the actuating means once said damper blade has traveled said preselected distance, and a timing device arranged to maintain said damper blade at said preselected distance for a preselected period of time before said actuating means is re-energized whereby said damper blade is actuated to move to a second open position; and, (2) said second control circuit includes means for energizing said actuating means to a position to cause the closing of said damper blade.
Claim 7
Dependent Claim
213 words
A damper control arrangement comprising: a. a housing wall having an orifice therein; b. a damper blade movably positioned selectively between at least one open position and a closed position in relation to said orifice; c. damper blade moving means in communication with said damper blade for moving said damper blade relative to said housing wall; d. actuating means operable to actuate said damper blade moving means for movement of said damper blade from one position to another, said actuating means including control means for said damper blade moving means actuated in response to a first control circuit and a second control circuit wherein (1) said first control circuit includes means for energiziNg the actuating means to a position to cause the selective opening of the orifice by moving said damper blade a preselected distance, means for de-energizing the actuating means once said damper blade has traveled said preselected distance, and a timing device arranged to maintain said damper blade at said preselected distance for a preselected period of time before said actuating means is re-energized whereby said damper blade is actuated to move to a second open position; and, (2) said second control circuit includes means for energizing said actuating means to a position to cause the closing of said damper blade.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |