Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1984-07-06
1986-12-02
Joyce, Harold
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
137 75, 251 95, 251112, 251113, 251305, F24F 1100
Patent
active
046256261
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a control/fire damper for ducts in ventilation installations, said control/fire damper comprising a shell constituting a flow duct, a closing member disposed inside the flow duct and which in fire damper use continuously tends to close under spring action, said control/fire damper being provided with a clamping counterpart attached to the closing member and with a clamping device passing through the shell and arranged to fix the counterpart by friction clamping in desired position, and said clamping device being clampable and releasable from outside the shell.
At present, in a number of structural designs known in the art, fixing of the closing plate in desired position is effected outside the damper by the aid of screw clamping between a sector plate or equivalent and its counterpiece. However, structures of this kind have the drawback of a certain space requirement outside the duct, which frequently entails difficulties in installation. In addition, the construction is susceptible to damage; it interferes with the lagging of the duct; and its appearance is not always acceptable, as is stated e.g. in the Norwegian patent application No. 802081.
In another structure known in the art, the fire limiter of the Finnish Pat. No. 54767, the fuse is a separate fuse attached to an adjusting cable or wire passing through the shell, and the closing plate is turnable into desired position with reference to the flow duct by the aid of the adjusting cable or wire, in order to produce the desired throttling. A drawback of this design is, in addition to inconvenient restoring operation after the closing plate has been trigged, that the fuse replacement operation is exceedingly cumbersome, and it is difficult after such replacement to reposition the closing plate exactly as before if the new fuse has different dimensions.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an improvement in control/fire dampers known in the art. A more detailed object of the invention is to provide a control/fire damper having its clamping mechanism situated within the flow duct, yet permitting the closing member to be adjusted from outside the damper and, in the case of a fire damper, fuse replacement from the outside. A further object of the invention is to provide a fire limiter in which fuse replacement does not impede the resetting of the closing member of the fire limiter in its former position.
The aims of the invention are achieved by a control/fire damper which is mainly characterized in that the clamping counterpart is located inside the shell.
The rest of the characteristic features of the control/fire damper of the invention are described in detail below.
With the control/fire damper of the invention, numerous remarkable advantages are gained. In the control/fire damper of the invention, the clamping counterpart and the clamping device are located within the shell of the flow duct, where space is always to be found for them, and they are well protected, and not outside the flow duct as in the case of the prior art, where the availability of space is often restricted or its use may cause inconvenience for instance in connection with the lagging of the duct. It is moreover of importance that the setting of the closing member can be carried out from outside the damper with ease. It is moreover of primary importance that in the case of a fire damper the fuse, which may be made contiguous with the clamping screw, can be replaced from the outside of the damper, without access to the inside. An advantage lies moreover therein that the only necessary structural difference between a control damper and a combined control/fire damper is in the screw of the clamping device.
DESCRIPTION OF THE DRAWINGS
The invention is described in detail referring to certain advantageous embodiments of the invention presented in the figures of the drawing attached, to which the invention is not, however, intended to be exclusively confined.
FIG. 1 presents a control/f
REFERENCES:
patent: 18912 (1857-12-01), Ketcham
patent: 1128228 (1915-02-01), Collar
patent: 2218330 (1940-10-01), Eliason
patent: 2774366 (1956-12-01), Dado
patent: 4512356 (1985-04-01), Widerby
Aalto Arvo
Aalto Erkki
Hasa Juhani
Penttila Markku
Saukkonen Harri
Halton Oy
Joyce Harold
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