Constant tension device for filter bag
AssigneeAlbany International Corp.
InventorsCarl V. Leunig, Stewart W. Smith
Life of this patent
Estimating the term…
Abstract
A constant tension device is provided for use with a filter bag. The device includes a spring and a linkage assembly for applying tension to the filter bag. The linkage assembly is designed such that a substantially constant tension is applied to the bag regardless of the force exerted by the spring. A pair of lever arms is included within the linkage assembly for applying pressure to a bag cap if the device is used within the filter bag.
Claims18
In a filtering assembly comprising a filter bag, a bag cap secured to said filter bag, and an opening within said bag cap, the improvement comprising:
- spring means within said filter bag;
- pressure transmitting means connected to said spring means and contacting said bag cap for applying pressure to said bag cap as a function of a spring force exerted by said spring means, said pressure transmitting means including means for varying the mechanical advantage through which the spring force is exerted upon said bag cap by said pressure transmitting means such that when said spring force is relatively high, the mechanical advantage is relatively high, and when said spring force is relatively low, the mechanical advantage is relatively low, thereby resulting in a substantially constant pressure being applied by said pressure transmitting means to said bag cap even if the spring force exerted by said spring means changes;
- and
- means for adjusting the spring force exerted by said spring means, said adjusting means extending through said opening within said bag cap.
A filtering assembly of a filter bag and a constant tensioning device for maintaining the filter bag under a substantially constant tension, said device comprising:
- spring means;
- means for adjusting the force exerted by said spring means;
- pressure transmitting means connected to said spring means for applying pressure to a surface of the filter bag as a function of a spring force exerted by said spring means, said pressure transmitting means including means for varying the mechanical advantage through which said spring force is exerted upon said pressure transmitting means such that when said spring force is relatively high, the mechanical advantage is relatively high, and when said spring force is relatively low, the mechanical advantage is relatively low, thereby resulting in a substantially constant pressure being applied by said pressure transmitting means even if the spring force exerted by said spring means changes;
- and
- means for conveying the pressure applied by said pressure transmitting means to said filter bag, thereby maintaining said bag under substantially constant tension.
A tensioning device comprising:
- a rod;
- first and second lever arms pivotably secured at a pivot point to opposite sides of said rod and in criss-crossing relation to each other;
- a compression spring having a first end and a second end;
- a flanged member mounted against the first end of said compression spring;
- a cylindrical member having one end contacting said flanged member and an opposing slotted end through which said lever arms extend, said cylindrical member including contact members contacting said lever arms on a first side of said pivot point;
- and
- means connecting said second end of said compression spring with said lever arms on a side of said pivot point opposite from said first side.
Dependencies are inferred from the claim text.