GB720542A - Improvements relating to ventilating fans - Google Patents
Improvements relating to ventilating fansInfo
- Publication number
- GB720542A GB720542A GB2026651A GB2026651A GB720542A GB 720542 A GB720542 A GB 720542A GB 2026651 A GB2026651 A GB 2026651A GB 2026651 A GB2026651 A GB 2026651A GB 720542 A GB720542 A GB 720542A
- Authority
- GB
- United Kingdom
- Prior art keywords
- louvres
- motor
- blades
- fan
- toggle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures
- F04D25/14—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures and having shutters, e.g. automatically closed when not in use
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
- Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
Abstract
720,542. Screw fans. HOTPOINT ELECTRIC APPLIANCE CO., Ltd. Aug. 8, 1952 [Aug. 28, 1951], No. 20266/51. Class 110 (1). In an electrically driven fan of the kind which is used in an aperture of a wall or window, the aperture can be closed by pivoted blades which are moved from the closed to the open position and vice versa in response to, or simultaneously with, the operation of the switch of the driving motor. The frame 1 of the fan is mounted, by means of rings 3, 4 and gaskets 5, within a hole in a window or other panel 2 and has a rectangular exhaust opening 10 which is closable by means of pivoted louvres 11 which overlap in the closed position. The louvres have arms 12 which are interconnected by links 13 and 13<SP>1</SP> for simultaneous actuation. Two of the louvres carry cranks 14 and 15 respectively, which are connected by a link 16 to form a toggle. A tension spring (not shown) is connected between the spindle 27 and the common pivot 17 of crank 15 and link 16. In the closed position of the louvres and in the open position shown, the toggle is over the dead centre position, so that in each case the spring holds the louvres in position. An abutment 141 limits the movement of the toggle. The fan is controlled by cords 19, 21 which are wound in opposite directions around a pair of pulleys mounted on the shaft of the rotary switch 25 of the driving motor 6. Thus, pulling cord 21 opens the louvres and switches on the motor, while pulling cord 19 closes the louvres and switches off the motor. The opening of the louvres may be effected by an electromagnetic relay, the winding of which is connected in series or in parallel with the motor 6 so as to be energized when the motor is switched on. The louvres may be replaced by an iris diaphragm comprising arcuate blades attached to relatively rotatable concentric rings. One of the rings is attached to the frame 1, preferably between the fan blades 9 and the spider 7 which supports the motor 6, so that the blades bear in the closed position on the casing of the motor In addition there may be fixed blades across the opening 10 to deflect rain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2026651A GB720542A (en) | 1951-08-28 | 1951-08-28 | Improvements relating to ventilating fans |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2026651A GB720542A (en) | 1951-08-28 | 1951-08-28 | Improvements relating to ventilating fans |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB720542A true GB720542A (en) | 1954-12-22 |
Family
ID=10143140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2026651A Expired GB720542A (en) | 1951-08-28 | 1951-08-28 | Improvements relating to ventilating fans |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB720542A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536413A (en) * | 1968-02-27 | 1970-10-27 | Matsushita Electric Ind Co Ltd | Ventilator |
| GB2241989A (en) * | 1990-03-15 | 1991-09-18 | Hsieh Tang Electric Co Ltd | Ventilating fan with shutter |
| US6213117B1 (en) | 1997-07-24 | 2001-04-10 | Board Of Regents Of University Of Nebraska | Motorized insulated damper assembly for furnace systems |
| CN111552086A (en) * | 2020-04-14 | 2020-08-18 | 江西省人民医院 | Medical science is viewing apparatus for image analysis |
| CN115788954A (en) * | 2023-01-30 | 2023-03-14 | 江苏永胜海洋工程有限公司 | Air volume adjusting door device |
-
1951
- 1951-08-28 GB GB2026651A patent/GB720542A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536413A (en) * | 1968-02-27 | 1970-10-27 | Matsushita Electric Ind Co Ltd | Ventilator |
| GB2241989A (en) * | 1990-03-15 | 1991-09-18 | Hsieh Tang Electric Co Ltd | Ventilating fan with shutter |
| US6213117B1 (en) | 1997-07-24 | 2001-04-10 | Board Of Regents Of University Of Nebraska | Motorized insulated damper assembly for furnace systems |
| CN111552086A (en) * | 2020-04-14 | 2020-08-18 | 江西省人民医院 | Medical science is viewing apparatus for image analysis |
| CN111552086B (en) * | 2020-04-14 | 2022-09-09 | 江西省人民医院 | Medical science is viewing apparatus for image analysis |
| CN115788954A (en) * | 2023-01-30 | 2023-03-14 | 江苏永胜海洋工程有限公司 | Air volume adjusting door device |
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