Filter cloth retention
Cloth retention apparatus for retaining the edges of a filter cloth comprises an edge strip having a bead, which can engage with a channel in a frame member, and be retained therein by a wedging member. The wedging member may be separate or attached to the bead, or incorporated therein. The wedging member may be a spring member.
1. A filter apparatus comprising:
a frame member having a longitudinal channel with opposing side walls;
opposing perforated filter screens extending perpendicular to said opposing side walls of said longitudinal channel, each of said opposing perforated filter screens having an edge respectively positioned adjacent said opposing side walls of said longitudinal channel, each of said opposing side walls respectively including an outwardly extending ledge to rest said edge of said perforated filter screen thereon;
opposing filter cloths each having an edge respectively positioned adjacent said opposing side walls of said longitudinal channel;
opposing edge strip members each having an elongated body and two outwardly extending flaps, said edges of said opposing filter cloths being secured between said outwardly extending flaps of said opposing edge strip members by a method selected from the group consisting of stitching, welding, adhering by adhesive and integral extrusion,
said elongated body of each of said opposing edge strip members being received back-to-back in said longitudinal channel with an outer wall thereof disposed in facing relation with said opposing side wall of said longitudinal channel and said outwardly extending flaps extending perpendicular to said opposing side walls of said longitudinal channel, whereby each of said opposing filter cloths is respectively positioned in overlying relation over one of said opposing perforated filter screens,
said opposing side walls of said longitudinal channel each including an inwardly turned lip which is received in a respective groove in said outer wall of said elongated body portion of said edge strip member; and
an elongated resilient wedging member having a shank portion received between facing inner walls of said opposing edge strip members and further having a head portion which overlies said outwardly extending flaps of said opposing edge strip members,
said shank portion acting to firmly press said opposing edge strip members outwardly into locking engagement with said opposing side walls of said longitudinal channel.
2. A filter apparatus according to claim 1 , wherein said elongated resilient wedging member includes an outwardly projecting bead which is adapted to push the elongate bodies into engagement under pressure with at least one of said opposing side walls of said longitudinal channel.
3. A filter apparatus according to claim 2 wherein said facing inner walls of said opposing edge strip members include respective grooves, said outwardly projecting bead extending outwardly from opposing sides of said shank portion and being received within said respective grooves.
4. A filter apparatus according to claim 1 , wherein said elongated resilient wedging member is removably mounted.
5. A filter apparatus according to claim 2 , wherein said elongated resilient wedging member is removably mounted.
6. A filter apparatus according to claim 3 , wherein said elongated resilient wedging member is removably mounted.
7. A filter apparatus according to claim 1 , wherein said elongated resilient wedging member is formed from the same material as said opposing edge strip members.
8. A filter apparatus according to claim 2 , wherein said elongated resilient wedging member is formed from the same material as said opposing edge strip members.
9. A filter apparatus according to claim 3 , wherein said elongated resilient wedging member is formed from the same material as said opposing edge strip members.
10. A filter apparatus according to claim 1 , wherein said elongated resilient wedging member is of a different hardness to said opposing edge strip members.
11. A filter apparatus according to claim 2 , wherein said elongated resilient wedging member is of a different hardness to said opposing edge strip members.
12. A filter apparatus according to claim 3 , wherein said elongated resilient wedging member is of a different hardness to said opposing edge strip members.