Gas separation – Flexible or collapsible bag type – With securing or supporting means
Patent
1997-10-23
1999-06-22
Woo, Jay H.
Gas separation
Flexible or collapsible bag type
With securing or supporting means
55491, 55493, 55497, 55500, 55511, 55DIG12, 55DIG31, B01D 2913
Patent
active
059144130
DESCRIPTION:
BRIEF SUMMARY
GAS FILTER UNIT
The subject invention relates to a gas filter unit of cartridge type, comprising a filter material put together to form one or several filter bags, and a support frame of essentially U-shaped cross-sectional configuration including a web portion and two adjoining lateral leg members in adjoining relationship therewith, the filter material closest to the mouths of the filter bags being clamped in position between said lateral leg members.
Gas filter units of the type outlined above are known for instance from U.S. Pat. No. 4,056,373. The frame designed to support the filter bags at the mouths thereof usually is either a metal frame having a U-shaped cross-sectional configuration, the lateral leg members or lateral flanges of which are clamped about the material closest to the filter bag mouths, or preferably a frame of a plastics material to which the filter bag and portions are secured by welding by means of a thermoplastic or otherwise hardenable material. This type of securement could also be used in a metal frame. Since the requirements of product recyclability are becoming stricter it is necessary that the various types of material incorporated in a product be easily separated to be subsequently subjected to destruction or recycling in a manner adapted to each individual material. In the case of filter units of the kind outlined above it has hitherto been impossible, or at least entailed considerable difficulties, to separate the support frame from the very filter bag material. In addition, complex equipment is required to insert and secure the filter bag material to the support frame in the manufacture of the filter cartridge.
The main purpose of the invention is to provide a gas filter unit which may be manufactured in a simple and cost-saving manner and which may also be easily separated into its various structural materials in connection with destruction and/or recycling.
This purpose is achieved in accordance with the invention by means of a gas filter unit which is essentially characterized in that the frame comprises profile sections of a flexible material, preferably of a plastics material, at least one of said lateral leg members being hingedly interconnected with the web portion, and in that locking means are provided to retain the corresponding lateral leg member in its clamping position wherein it is pivoted into engagement with the other lateral leg member. Owing to this arrangement the filter bags are easily inserted into the frame part and the frame part may be clamped thereto simply by the lateral leg members being folded inwards, the frame part being efficiently secured to the filter bags following activation of the locking means. By releasing the locking means the frame may be detached from the filter bags in a simple manner and both components be destructed and/or recycled separately.
Preferably, the pivotable lateral leg members and the web portion are integrally interconnected as a unit via a thinner hinge portion. The assembly is thus greatly facilitated because the entire cross-section of the frame pieces consist of captively interconnected pieces.
Preferably, those edge portions of the lateral leg members that face away from the web portion are bent inwards so as to form a filter-material securing nip when in their clamping position. Owing to this bent configuration resilient clamping portions are formed that efficiently retain the filter material, independently of any changes of the shape of the material that may be caused for instance by changes in the environment in which the gas filter unit is used.
Preferably, the locking means are in the shape of hook means formed on respectively the web portion and the lateral leg members and spaced a distance from the respective hinge connection between the web portion and the lateral leg members, said hook means interengaging in the filter-material clamping position. Owing to this arrangement a simple locking device is produced, which owing to its position in relation to the hinge allows the lateral leg members to be ef
REFERENCES:
patent: 3099547 (1963-07-01), Hagendoorn et al.
patent: 3142550 (1964-07-01), Kuehne
patent: 5320655 (1994-06-01), Ernst
patent: 5342423 (1994-08-01), Taft
patent: 5476526 (1995-12-01), Attermeyer
Andersson Gunnar
Engvall Bo
Lindvert Bo
Strom Goran
Hopkins Robert
Scandfilter AB
Woo Jay H.
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