Patent ID: 7491338
Filing Date: 2009-02-17
Classification: E03F

Abstract:
1. An auto-release trash blocking apparatus for use in fluid channels, comprising- a. a grid, the grid having a plurality of apertures adapted in size and shape to permit fluid to pass through the grid but to block at least some trash; b. a support structure for mounting the grid within a channel, wherein the support structure is connected to at least one surface of the channel, wherein c. a hold-release means for at least helping to hold the grid in the closed position until an occurence of predetermined release conditions, wherein said hold-release means releasably connects at least part of the grid to the front support and wherein said hold-release means releasably connects at least part of the grid from the front support in response to the occurence of predetermined release conditions, wherein pressure against the upstream side of the grid urges the grid toward the open position; and, wherein the hold-release means automatically releasably re-connects the at least part of the grid to the front support upon return of the grid to the closed position; and, d. a means for applying torque to the grid in a direction for rotating the grid between the open position and the closed position, said means for applying torque to the grid being comprised of the grid's weight, a torque-inducing means, or both the grid's weight and the torque-inducing means.