US4738190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan casing with cover
Assignee: Individual
•
Filing: 1986-04-11
•
Granted: 1988-04-19
•
Expires: 2006-04-11
Abstract
Abstract A fan casing is provided with a cover plate which is mounted on a horizontal shaft above a casing opening for turning between a closed position and an opening position and which is actuated by a solenoid-operated rod provided in the casing.
Inventors
- 👤 Muh-Chuan Sheu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:26
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A fan casing comprising: a housing having a first opening at one side thereof and a second opening at an opposite side thereof; a horizontal shaft pivotally mounted on the housing above said first opening and parallel to the plane of said one side, said shaft having a lobe at one end extending radially therefrom; a cover plate for covering said first opening, said cover plate having at its top side at least one lug with an eye therein through which said shaft passes and being fixedly mounted to the shaft so that as said shaft turns, said cover turns about the axis of said shaft between an open position and a closed position, a helical spring sleeved around said shaft to bias said cover plate to the closed position; and a vertical rod having a hook end at its top side in engagement with said lobe of said shaft and a solenoid means connected to said vertical rod to pull it downward upon activation of the means and pivot the cover plate to its open position.
Claim 2
Dependent Claim
177 words
A fan casing comprising: a housing having a first opening at one side thereof and a second opening at an opposite side thereof; a horizontal shaft pivotally mounted on the housing above said first opening and parallel to the plane of said one side, said shaft having a lobe at one end extending radially therefrom; a cover plate for covering said first opening, said cover plate having at its top side at least one lug with an eye therein through which said shaft passes and being fixedly mounted to the shaft so that as said shaft turns, said cover turns about the axis of said shaft between an open position and a closed position, a helical spring sleeved around said shaft to bias said cover plate to the closed position; and a vertical rod having a hook end at its top side in engagement with said lobe of said shaft and a solenoid means connected to said vertical rod to pull it downward upon activation of the means and pivot the cover plate to its open position.
Claim 3
Dependent Claim
29 words
The fan casing of claim 1, including a helical spring sleeved around the vertical rod to return the rod to its original position upon deactivation of the solenoid means.
Claim 4
Dependent Claim
31 words
The fan casing of claim 1, wherein the cover plate is normally in a vertical plane in its closed position and is turned through 90 degrees upward to its open position.
References Cited (Backward Citations)
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Cited
GB235934A
Cited
US1792514A
Cited
US3036541A
Cited
US3484075A
Cited
JPS54113950A
Cited
US4556192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |