US3625629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportional blower
Assignee: MKM Corp
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Filing: 1970-06-04
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Granted: 1971-12-07
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Expires: 1990-06-04
Abstract
Abstract A proportional blower having two inlets and a single outlet, and a pair of damper plates mounted for simultaneous movement one toward and the other away from such inlets for respectively decreasing and increasing the effective cross-sectional areas of such inlets in inverse amounts. Also associated with one of the blower inlets is a fixed or variable restriction which aids in maintaining a substantially constant discharge from the blower outlet during modulation of one or both of the blower inlets.
Inventors
- 👤 Thompson Morrison
- 👤 Hunter Morrison Jr
- 👤 George F Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:14
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/04; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F04D25/00; F04D25/16; F04D25/166
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A proportional blower comprising a blower housing having a pair of spaced inlets and a single outlet, means contained within said blower housing for drawing air or other gases into said inlets and discharging such air through said outlet, movable damper means disposed adjacent each inlet, means interconnecting said damper means for movement toward and away from their respective inlets to increase the effective cross-sectional area of one of said inlets while decreasing the cross-sectional area of the other inlet and vice versa, and restrictor means for reducing the flow through one of said inlets below the flow through the other inlet when both of said damper means are midway between their fully closed and fully open positions so that the combined flow through both of said inlets is substantially the same as the flow through the other inlet when its associated damper means is in the full open position and said one inlet is closed.
Claim 2
Dependent Claim
156 words
A proportional blower comprising a blower housing having a pair of spaced inlets and a single outlet, means contained within said blower housing for drawing air or other gases into said inlets and discharging such air through said outlet, movable damper means disposed adjacent each inlet, means interconnecting said damper means for movement toward and away from their respective inlets to increase the effective cross-sectional area of one of said inlets while decreasing the cross-sectional area of the other inlet and vice versa, and restrictor means for reducing the flow through one of said inlets below the flow through the other inlet when both of said damper means are midway between their fully closed and fully open positions so that the combined flow through both of said inlets is substantially the same as the flow through the other inlet when its associated damper means is in the full open position and said one inlet is closed.
Claim 3
Dependent Claim
18 words
The proportional blower of claim 1 wherein said restrictor means comprises a fixed restriction at said one inlet.
Claim 4
Dependent Claim
66 words
The proportional blower of claim 1 wherein said restrictor means comprises a restrictor plate pivoted to one end of said blower housing in overlying relation to said one inlet, and means interconnecting and restrictor plate to said damper means for pivotal movement of said restrictor plate during movement of said damper means to vary the amount of restriction of said one inlet by said restrictor plate.
Claim 5
Dependent Claim
36 words
The proportional blower of claim 3 wherein said interconnecting means causes pivotal movement of said restrictor plate to a nonrestricting position when the damper means associated with said one inlet is in the full open position.
Claim 6
Dependent Claim
63 words
The proportional blower of claim 3 wherein said restrictor plate overlies only a portion of said one inlet when in its maximum restricting position, and said means interconnecting said restrictor plate to said damper means permits independent movement of said damper means relative to said restrictor plate during the initial opening and final closing of said one inlet by the associated damper means.
Claim 7
Dependent Claim
53 words
The proportional blower of claim 5 wherein said means interconnecting said restrictor plate to said damper means comprises a rod freely slidable in aligned openings in said restrictor plate and associated damper means, and means on the ends of said rod to limit relative movement between said restrictor plate and associated damper means.
Claim 8
Dependent Claim
81 words
The proportional blower of claim 1 further comprising means defining a plenum chamber having communication with said one inlet, and an opening in said plenum chamber through which air is drawn by said blower into said one inlet, said restrictor means comprising a restrictor plate mounted for pivotal movement to restrict the flow through said opening, and linkage means interconnecting said restrictor plate and damper means for causing such pivotal movement of said restrictor plate during movement of said damper means.
Claim 9
Dependent Claim
38 words
The proportional blower of claim 1 wherein said restrictor means comprises a restrictor plunger mounted on one of Said damper means for movement into and out of said one inlet to restrict the size of said one inlet.
Claim 10
Dependent Claim
25 words
The proportional blower of claim 8 wherein said restrictor plunger is of a size less than the size of said one inlet when received therein.
Claim 11
Dependent Claim
81 words
The proportional blower of claim 8 further comprising a guide member on said blower housing surrounding a portion of said one inlet, said guide member having an opening therein closely matching a portion of the outer periphery of said restrictor plunger to provide a seal for said restrictor plunger when received therein, whereby said restrictor plunger will restrict said one inlet substantially to the same amount despite variations in the extent of axial overlap between said restrictor plunger and guide member.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |