Patent ID: 11890647
Assignee: DERRICK CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 17:
18. A method of securing a screening assembly to a vibratory screening machine, comprising:
placing a screening assembly on a screen receiving portion of a vibratory screening machine, where the screening assembly comprises a support member and a screening surface, the support member having a front and a rear, first and second sides, a top surface, a bottom surface, a plurality of flow through apertures and a first plurality of mounting apertures located along the first side, each mounting aperture including a compression surface located on an inner side of the mounting aperture relative to a centerline of the support member, wherein the screening surface is attached to the top surface of the support member, wherein placing the screening assembly on the screen receiving portion of the vibratory screening machine comprises locating the screening assembly such that a first plurality of compression pistons of compression mechanisms on the vibratory screening machine are aligned with the first plurality of mounting apertures; and
causing the first plurality of compression pistons to advance toward the centerline of the support member, wherein each of the first plurality of compression pistons has at least one compression surface configured to bear against a compression surface of a mounting aperture, the at least one compression surfaces of the compression pistons being configured such that when the first plurality of compression pistons are advanced toward the centerline of the support member and bear against the compression surfaces of the first plurality of mounting apertures, resultant compressive forces applied to the compression surfaces of the first plurality of mounting apertures include a first component that is oriented horizontally toward a centerline of the support member and a second component that is oriented vertically downward, wherein the resultant compressive forces cause the screening assembly to flex into a concave shape where a center of the support member is lower than the sides of the support member, wherein the resultant compressive forces cause the support member to be pushed into engagement with underlying concave support surfaces of the vibratory screening machine, and wherein the resultant compressive forces are sufficient to hold the screening assembly against the support surfaces of the vibratory screening machine while the screening assembly is subjected to vibratory forces that apply between 3G and 9G of acceleration to the screening assembly.