# US 8,784,528 B2 · Holding frame > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,528 B2 - Document ID: US8784528B2 - Status: Granted - Kind: B2 - Application number: 13/302,444 - Filed: 2011-11-22 - Published: 2013-05-23 - Granted: 2014-07-22 - Earliest claimed: 2011-11-22 - Assignees: Camfil USA, Inc. - Applicants: Joseph J. Gorman - Inventors: Joseph J. Gorman - Web page: https://patentgrep.com/patent/US8784528B2 ## CPC - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 46/0002: {Casings; Housings; Frame constructions} - B01D 46/10: Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces - B01D 2279/50: for air conditioning - F24F 13/28: Arrangement or mounting of filters - Y10S 55/31: Filter frame - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract Embodiments of the invention generally provide a holding frame having at least one rigid retainer and/or flexible retainers. The holding frame assembly is typically mounted in a housing of an air handler or other air moving conduit. The rigid retainer(s) and flexible retainer(s) are coupled to the holding frame assembly to define filter retaining pockets that retain a final filter within the holding frame assembly without use of clips and other fastening mechanisms. ## Claims ### Claim 1 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; and a first flexible retaining member coupled to at least one of the walls and positioned in a parallel spaced-apart relation proximate to one of the flanges, wherein a surface of the flange and a surface of the first flexible retaining member define a filter receiving pocket for retaining a filter element and the first flexible retaining member is repositionable on the wall to select a depth of the filter receiving pocket. ### Claim 2 (depends on 1) The filter holding frame of claim 1, wherein the first flexible retaining member is configured to bend to allow the filter element to pass over the first flexible retaining member to enter the filter receiving pocket. ### Claim 3 (depends on 1) The filter holding frame of claim 1, further comprising: a second flexible retaining member coupled to a wall opposing the at least one of the walls having the first flexible retaining member, the second flexible retaining member and positioned in a parallel spaced-apart relation proximate to one of the flanges. ### Claim 4 (depends on 3) The filter holding frame of claim 3, wherein the first and second flexible retaining members have a resiliency sufficient compress the filter element between the first and second flexible retaining members. ### Claim 5 (depends on 3) The filter holding frame of claim 3, wherein the first and second flexible retaining members have one or more surface features configured to aid gripping the filter element. ### Claim 6 (depends on 1) The filter holding frame of claim 1, wherein the first flexible retaining member comprising: a mounting portion coupled to the holding frame; and a flange extending from the mounting portion. ### Claim 7 (depends on 6) The filter holding frame of claim 6, wherein the first flexible retaining member further comprises: a flange extending from the flange of the first flexible retaining member and configured to urge the filter element against the flange of the wall. ### Claim 8 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; a plurality of engagement features coupled to a first wall of the plurality of walls, wherein the engagement features are spaced at pre-determined distances from the back flanges of the walls; at least one flexible retaining member coupled to the first wall by a first engagement feature of the plurality of engagement features at a first position selected to define a filter receiving pocket for retaining a filter element; and a rigid retaining member coupled to at least one of the walls not having the first flexible retaining member coupled thereto, wherein the rigid retaining member is disposed in a parallel spaced-apart relation to one of the flanges to define the filter receiving pocket. ### Claim 9 (depends on 8) The filter holding frame of claim 8, wherein the flexible retaining member is configured to bend to allow the filter element to pass over the flexible retaining member to enter the filter receiving pocket. ### Claim 10 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; a first flexible retaining member coupled to at least one of the walls and positioned in a parallel spaced-apart relation proximate to one of the flanges, wherein a surface of the flange and a surface of the first flexible retaining member define a filter receiving pocket for retaining a filter element; and a rigid retaining member coupled to at least one of the walls not having the first flexible retaining member coupled thereto, wherein the rigid retaining member is disposed in a parallel spaced-apart relation to one of the flanges to define the filter receiving pocket. ### Claim 11 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; a first flexible retaining member coupled to at least one of the walls and positioned in a parallel spaced-apart relation proximate to one of the flanges, wherein a surface of the flange and a surface of the first flexible retaining member define a filter receiving pocket for retaining a filter element; and a second flexible retaining member coupled to the wall, wherein the second flexible retaining member is positioned in a parallel spaced-apart relation proximate to the first flexible retaining member, wherein a surface of the first flexible retaining member and a surface of the second flexible retaining member define a second filter receiving pocket upstream of the first filter receiving pocket. ### Claim 12 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; a plurality of engagement features coupled to a first wall of the plurality of walls, wherein the engagement features are spaced at pre-determined distances from the back flanges of the walls; at least one flexible retaining member coupled to the first wall by a first engagement feature of the plurality of engagement features at a first position selected to define a filter receiving pocket for retaining a filter element; and a rigid retaining member coupled to at least one of the walls not having the flexible retaining member coupled thereto, wherein the rigid retaining member is coupled by a second engagement feature disposed at a second position equidistant from the back flanges as the first engagement feature. ### Claim 13 A filter holding frame, comprising: a plurality of walls coupled to form a rectangular ring; a flange extending inward from a back edge of each wall; a plurality of engagement features coupled to a first wall of the plurality of walls, wherein the engagement features are spaced at pre-determined distances from the back flanges of the walls; at least one flexible retaining member coupled to the first wall by a first engagement feature of the plurality of engagement features at a first position selected to define a filter receiving pocket for retaining a filter element; and a second flexible retaining member coupled to the wall by a second engagement feature, wherein the second engagement feature is disposed at a second position upstream of the first engagement feature, wherein an upstream surface of the first flexible retaining member and a downstream surface of the second flexible retaining member define a second filter receiving pocket upstream of the first filter receiving pocket.