Patent ID: 7077271

Claim:
A secondary screen for a trailerable concrete pump, comprising: (a) said secondary screen including a length and a width and an opening size that prevents the passage of an object having a dimension larger than that of said opening size through said secondary screen; and (b) hingedly attaching said secondary screen at a first end thereof to said trailerable concrete pump and at a predetermined distance above a hopper of said trailerable concrete pump; and (c) wherein when said secondary screen is hingedly attached to said trailerable concrete pump, said secondary screen is disposed above a grate that is attached proximate to said hopper and wherein said opening size of said secondary screen is smaller than an opening size of said grate, and (d) wherein when said secondary screen is disposed in a position adapted for use, said secondary screen is disposed at an angle with respect to a level plane of the earth and wherein said secondary screen is hingedly attached to said trailerable line pump and wherein said secondary screen includes said first end and an opposite second end, and wherein when said secondary screen is disposed in a position adapted for use, said second end is higher than said first end, and wherein said secondary screen is adapted to permit said object to fall off of said secondary screen and not to fall on said grate.