Patent US3830146A successfully refreshed from Google Patents.
US3830146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilator control system
Assignee: CTB Inc
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Filing: 1972-12-08
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Granted: 1974-08-20
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Expires: 1992-12-08
Abstract
Abstract A system for controlling the ventilation of an enclosure such as a poultry or livestock house is disclosed. The system includes a ventilator mounted in a wall of the enclosure. Pressure difference between the inside and outside of the enclosure created by suitable fans, causes a flow of air to pass through the ventilator. A sliding door assembly controls the amount of air which passes through the ventilator; the sliding door assembly is operated by a pressure-sensitive actuator switch. When the pressure difference exceeds a preset pressure range, the sliding door inlet assembly is opened slowly until the pressure difference drops within the preset pressure range at which point the sliding door inlet assembly is halted. When the pressure difference drops below the preset pressure range, the sliding door inlet assembly is closed slowly until the pressure difference rises into the preset pressure range at which point the sliding door inlet assembly is once again halted. Limit sensing switches are also provided to halt operation of the dooroperating mechanism at the fully opened or fully closed positions.
Inventors
- 👤 S Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:27
CPC Classifications
A; A01; A01K; A01K1/00; A01K1/0047; A01K1/0064; F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/12; F24F13/14; F24F13/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
257 words
A system for ventilating a building, comprising a plurality of ventilating devices, each ventilating device including a frame defining an opening in the building, tracks mounted to the frame, a plurality of doors mounted on the tracks in stacked relationship for sliding motion to infinitely vary the effective size of the inlet openings between open and closed positions, a guide member mounted on each door for engaging the guide member on an adjacent door to drag the adjacent door toward an open or closed position when a first door has been moved through a distance toward said open or closed position, a plurality of spaced apart, rotatable louvers, interlocking means for rotating all the louvers in a ventilating device in unison to control the flow of air through the ventilating device; the system further including endless winch means connected to at least one door of each ventilating device, drive motor means for driving the endless winch means to simultaneously open or simultaneously close the ventilator device doors to change the effective size of the inlet openings, limit means for limiting the extent of drive motor means motion, first pressure sensing means for sensing the atmospheric pressure at a first point located inside the building, second pressure sensing means for sensing the atmospheric pressure at a second point located outside the building, means for determining any differential between the sensed atmospheric pressures, and pressure sensitive switch means for energizing the drive motor means when the differential between the sensed inside and sensed outside pressures exceed a pre-set limit.
Claim 2
Independent Claim
257 words
A system for ventilating a building, comprising a plurality of ventilating devices, each ventilating device including a frame defining an opening in the building, tracks mounted to the frame, a plurality of doors mounted on the tracks in stacked relationship for sliding motion to infinitely vary the effective size of the inlet openings between open and closed positions, a guide member mounted on each door for engaging the guide member on an adjacent door to drag the adjacent door toward an open or closed position when a first door has been moved through a distance toward said open or closed position, a plurality of spaced apart, rotatable louvers, interlocking means for rotating all the louvers in a ventilating device in unison to control the flow of air through the ventilating device; the system further including endless winch means connected to at least one door of each ventilating device, drive motor means for driving the endless winch means to simultaneously open or simultaneously close the ventilator device doors to change the effective size of the inlet openings, limit means for limiting the extent of drive motor means motion, first pressure sensing means for sensing the atmospheric pressure at a first point located inside the building, second pressure sensing means for sensing the atmospheric pressure at a second point located outside the building, means for determining any differential between the sensed atmospheric pressures, and pressure sensitive switch means for energizing the drive motor means when the differential between the sensed inside and sensed outside pressures exceed a pre-set limit.
Claim 3
Dependent Claim
109 words
A system according to claim 1 wherein said drive motor means includes means for driving said drive motor means in one direction to open said ventilating device doors, and in the opposite direction to close said ventilating device doors, and wherein said pressure sensitive switch means includes means for energizing said drive motor means to drive the drive motor means in one direction when the sensed pressure differential is less than a pre-set minimum pressure differential limit, and means for energizing said drive motor means to drive said drive motor means in the opposite direction when the sensed pressure differential is greater than a pre-set maximum pressure differential limit.
Claim 4
Dependent Claim
34 words
A system according to claim 1 wherein said limit means includes endless belt means connected to said drive motor means and said winch means for motion corresponding with the motion of the winch means.
Claim 5
Dependent Claim
16 words
A system according to claim 3 wherein said endless belt means includes a roller chain member.
Claim 6
Dependent Claim
64 words
A system according to claim 3 wherein said limit means includes limit switch means positioned for actuation by the endless belt means when a pre-determined limit of motion of the winch means and the endless belt means are reached, said limit switch being connected to said drive motor means for halting operation of said drive motor means when said limit switch means is actuated.
Claim 7
Dependent Claim
49 words
A system according to claim 1 wherein said limit means inclUdes screw means driven by said drive motor means and screw follower means connecting said screw means with said endless winch means to drive said winch means with a motion corresponding with the motion of said drive motor means.
Claim 8
Dependent Claim
60 words
A system according to claim 6 wherein said limit means includes limit switch means positioned for actuation by the screw follower means when a pre-determined limit of motion of the winch means are reached, said limit switch means being connected to said drive motor means for halting operation of said drive motor means when said limit switch means is actuated.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |