EP0439345A2 - Damper blade mounting - Google Patents
Damper blade mounting Download PDFInfo
- Publication number
- EP0439345A2 EP0439345A2 EP91300519A EP91300519A EP0439345A2 EP 0439345 A2 EP0439345 A2 EP 0439345A2 EP 91300519 A EP91300519 A EP 91300519A EP 91300519 A EP91300519 A EP 91300519A EP 0439345 A2 EP0439345 A2 EP 0439345A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- spindle
- base
- duct
- fastening means
- 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.)
- Withdrawn
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
Abstract
A damper blade (12) is rotatably mounted in an air duct (10) by means of spindles (14) secured to the blade. Fastening means comprising spring clip devices (16) are attached to the blade (12) edges before insertion of the blade into the duct (10), and the spindles (14) become secure to the blade upon insertion through the duct walls and into operative engagement with the clips. The clips (16) each comprise convergent base (28) and retaining (36) portions between which the blade (12) and inserted spindle (14) are gripped. A non-circular opening (38) in a web (30) connecting the base and retaining portions co-operates with a non-circular portion of the spindle (14) to prevent rotation of the clip (16) and the blade (12) relative to the spindle.
Description
- In an air duct, for example in a heating and ventilating system, a rotatable damper blade may be used within the duct to control the air flow along the duct; the blade may be turned, commonly by means of a quadrant handle, through 90° between a first position in which the blade stands across the duct (for maximum restriction of the air flow) and a second position in which the blade extends along the duct axis, the quadrant handle commonly being lockable at any required intermediate position.
- Such a damper blade may be rotatably mounted in the duct walls by means of trunnion pieces secured to the blade. Most commonly the trunnions are secured to the blade by means of screw fastenings which have to be inserted through the trunnions and the blade, in situ within the duct, after insertion of the trunnions through the duct walls. Such an assembly operation can be very awkward, particularly in the case of small ducts.
- It is an object of the present invention to provide an improved damper blade mounting arrangement.
- The invention provides, in one of its aspects, a method of mounting a damper blade rotatably within an air duct by means of a spindle which is secured to the blade and extends through the duct wall, characterised in that the spindle is secured to the blade utilising fastening means which enables the spindle to be inserted through the duct wall and into operative engagement with the fastening means, the fastening means being secured to the blade prior to insertion of the spindle.
- In a preferred arrangement, the fastening means comprises a spring clip device which can be pressed over an edge of the blade to grip a marginal portion of the blade, and which accommodates an inner end portion of the inserted spindle to secure the spindle to the blade for rotation of the blade. The spring clip may comprise base and retaining portions between which the blade and spindle are gripped, the base and retaining portions being spaced apart at an outer end of the clip where they are connected by an upstanding web from the base, and being mutually inclined in an inwards direction away from the web to converge and grip the blade and spindle. An opening in the web receives the spindle upon insertion; preferably, the opening is of a non-circular cross-section and co-operates with a non-circular portion of the spindle to prevent rotation of the clip (and the blade) relative to the spindle.
- There now follows a description, to be read with reference to the accompanying drawings, of a volume control damper mounted in an air duct.
- In the accompanying drawings:
- Figure 1 is a view of the damper seen in the direction along the duct;
- Figure 2 is a view of the damper seen in a longitudinal section through the duct; and
- Figure 3 is a perspective view of one of two spring clips used in mounting a blade of the damper shown in Figures 1 and 2.
- In an
air duct 10 of rectangular cross-section, a volume control damper comprises a single flatrotatable blade 12. - The rectangular blade is rotatably mounted by means of two
spindles 14 projecting from opposite edges of the blade. Inner end portions of the spindles are secured to the blade by means ofspring clips 16, and outer end portions of the spindles project from the blade throughbushes 18 which act as bearings mounted in apertures in the duct walls. In a generally conventional arrangement, aquadrant handle 20 is mounted on one of thespindles 14, outside the duct, to enable rotation of the spindle (and so the damper blade). The blade can be locked in adjusted position by means of awing nut 22 on ahandle locking pin 24 which is mounted to project externally from the duct. - The two blade-mounting arrangements are identical. Each of the
spindles 14 is in the form of a flat bar, to prevent rotation of theblade 12 and the quadrant handle 20 relative to the spindles. Each of thebushes 18 has a circular aperture permitting rotation of the associated spindle extending through it; the bush is inserted through the duct wall from the inside of the duct, ahead flange 26 of the bush lying against the inner surface of the duct wall. - The form of the
spring clips 16 is shown also in Figure 3. The one-piece clip comprises arectangular base 28. A web forming anouter wall 30 stands up perpendicularly from an outer edge of the base, and aretaining plate 32 extends inwards as a cantilever from the top edge of thewall 30 down towards thebase 28 at an acute angle. The retaining plate 32 (see also Figure 1) is generally rectangular but is cut away centrally from its free inner edge (i.e. adjacent to the base 28) back towards thewall 30 to form arectangular slot 34 between two remaining portions of theplate 32 formingclamping fingers 36. Theslot 34 is of a suitable width to accommodate thespindle 14. - A
rectangular opening 38, aligned with theslot 34 and of a shape corresponding to the spindle cross-section, is formed in theouter wall 30 of the clip to enable the spindle to be fed through the clip. Each of the clampingfingers 36 terminates at its free end in a rounded andupturned portion 40 which serves to grip a marginal portion of the damper blade against thebase 28 of the clip (see Figure 2), at least prior to insertion of thespindle 14. Four teeth 42 (the backs of which are shown schematically in Figure 3) assist with secure gripping of the blade. - In assembly of the damper, the
bearing bushes 18 and thehandle locking pin 24 are initially inserted, from inside the duct, through pre-drilled holes in the duct walls. Thespring clips 16 are then pressed over the edges of thedamper blade 12, each to grip the blade between itsbase 28 and itsclamping fingers 36. Thedamper blade 12 is then introduced into the duct and positioned so that theopenings 38 in the clips become aligned with thebushes 18. The twospindles 14 are then inserted, from outside the duct, through thebushes 18 and through theopenings 38 into thespring clips 16 to lie flat against theblade 12; anedge 42 of each clip, extending between theclamping fingers 36 at a closed end of theslot 34, frictionally engages thespindle 14 to resist longitudinal movement of the spindle. Finally, thequadrant handle 20, which is formed with a suitable rectangular opening to match the spindle cross-section, is mounted on its associated spindle and secured by means of thewing nut 22 on thelocking pin 24.
Claims (7)
- A method of mounting a damper blade (12) rotatably within an air duct (10) by means of a spindle (14) which is secured to the blade and extends through the duct wall, characterised in that the spindle is secured to the blade utilising fastening means (16) which enables the spindle to be inserted through the duct wall and into operative engagement with the fastening means, the fastening means being secured to the blade prior to insertion of the spindle.
- A method according to Claim 1 characterised in that the fastening means comprises a spring clip device (16) which is initially pressed over an edge of the blade (12) to grip a marginal portion of the blade, and which grips the inserted spindle (14) to secure the spindle to the blade (12) for rotation of the blade.
- A method according to claim 2 characterised in that the spring clip device (16) comprises base (28) and retaining (36) portions between which the blade (12) and spindle (14) are gripped, the base and retaining portions being spaced apart at an outer end of the clip (16) where they are connected by an upstanding web (30) from the base (28), and being mutually inclined in an inwards direction away from the web to converge and grip the blade (12) and spindle (14), the spindle extending through an opening (38) in the web (30).
- A method according to claim 3 characterised in that the opening (38) is of non-circular cross-section and co-operates with a non-circular portion of the spindle (14) to prevent rotation of the clip (16) and the blade (12) relative to the spindle.
- Apparatus for use in a method according to claim 1 comprising a blade (12), a blade-mounting spindle (14) and fastening means (16) whereby the spindle can be secured to the blade, characterised in that the fastening means comprises a spring clip device (16) which can be pressed over the edge of the blade (12) initially to grip a marginal portion of the blade, and into operative engagement with which the spindle can be inserted through the duct wall for securement of the spindle (14) to the blade (12).
- Apparatus according to claim 5, characterised in that the spring clip device (16) comprises base (28) and retaining (36) portions between which the blade (12) and spindle (14) are to be gripped, the base and retaining portions being spaced apart at an outer end of the clip (16) where they are connected by an upstanding web (30) from the base (28), and being mutually inclined in an inwards direction away from the web to converge and grip the blade (12) and spindle (14), there being an opening (38) in the web (30) through which the spindle (14) can be inserted.
- Apparatus according to claim 6 characterised in that the opening (38) is of non-circular cross-section and is adapted to co-operate with a non-circular portion of the spindle (14) to prevent rotation of the clip (16), and the blade (12), relative to the spindle.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9001866 | 1990-01-26 | ||
GB909001866A GB9001866D0 (en) | 1990-01-26 | 1990-01-26 | Damper blade mounting |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0439345A2 true EP0439345A2 (en) | 1991-07-31 |
EP0439345A3 EP0439345A3 (en) | 1992-06-17 |
Family
ID=10669983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910300519 Withdrawn EP0439345A3 (en) | 1990-01-26 | 1991-01-23 | Damper blade mounting |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0439345A3 (en) |
GB (1) | GB9001866D0 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4715581A (en) * | 1987-03-23 | 1987-12-29 | Sheet Metal Connectors, Inc. | Damper construction |
US4744290A (en) * | 1987-08-03 | 1988-05-17 | American Hardware & Paint Co., Inc. | Pivoted damper blade and pin therefor |
-
1990
- 1990-01-26 GB GB909001866A patent/GB9001866D0/en active Pending
-
1991
- 1991-01-23 EP EP19910300519 patent/EP0439345A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4715581A (en) * | 1987-03-23 | 1987-12-29 | Sheet Metal Connectors, Inc. | Damper construction |
US4744290A (en) * | 1987-08-03 | 1988-05-17 | American Hardware & Paint Co., Inc. | Pivoted damper blade and pin therefor |
Also Published As
Publication number | Publication date |
---|---|
GB9001866D0 (en) | 1990-03-28 |
EP0439345A3 (en) | 1992-06-17 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 19921218 |