# US 4,392,956 A · Encapsulated frame type filter press > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,956 A - Document ID: US4392956A - Status: Granted - Kind: A - Application number: 06/301,219 - Filed: 1981-09-11 - Granted: 1983-07-12 - Earliest claimed: 1981-09-11 - Assignees: Stavo Industries, Inc. - Inventors: George P. Vogel - Web page: https://patentgrep.com/patent/US4392956A ## CPC - B01D 25/12: Filter presses, i.e. of the plate or plate and frame type - B01D 35/30: Filter housing constructions - B01D 35/31: including arrangements for environmental protection, e.g. pressure resisting features - 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) ## Abstract An upwardly opening tank including interconnected opposite side and end walls and a first stationary filter head therein is provided. A second head is mounted in the tank and is shiftable toward and away from the stationary head for clamping a plurality of filter frames between the heads. The stationary head includes inlet and outlet passages for inlet and outlet flow of fluid to be filtered and a downwardly opening cover is provided for the tank including interconnected opposite side and end walls. A lift frame swingably supports the cover from the tank for forward and downward swinging of the cover into closed position and upward and rearward swinging of the cover toward an open position with the cover disposed in a forwardly and downwardly opening attitude. The upper marginal edges of the tank include seal structure for forming at least a generally fluid-tight seal with the lower marginal edges of the cover when the cover is closed, the end walls of the tank include trapezoidal-shaped upper extensions, the end walls of the cover include complementary similar shape and size downwardly opening recesses in which the extensions are received when the cover is closed and the cover is supported for slight oscillation about a horizontal axis extending longitudinally of the cover relative to the lift frame. ## Claims ### Claim 1 An encapsulated frame-type filter press, said press including an upwardly opening tank having interconnected opposite side and end walls, a first stationary filter head mounted in one end of said tank, a second movable head mounted in the other end of said tank and adjustably shiftable toward and away from said first head, a plurality of alternating filter panels and filter frames releasably clamped between said heads, said first head including inlet and outlet passages formed therethrough for inlet and outlet flow of fluid to be filtered to and from said filter panels and frames, a downwardly opening cover for said tank including interconnected opposite side and end walls, the lower marginal set of edges of said cover side and end walls and the upper marginal set of edges of said tank side and end walls being positionable in juxtaposed relation for closing said tank, support means swingably supporting said cover from said tank for forward and downward swinging of said cover into position closing said tank and upward and rearward swinging of said cover toward and an open position with said cover upwardly and rearwardly displaced relative to said tank and disposed in a forwardly and downwardly opening attitude, one of said sets of edges including seal means for forming at least a generally fluid-tight seal with the other set of edges when said cover is in the closed position, said support means including a lift frame pivotably supported from said tank for oscillation relative thereto about a first horizontal axis extending longitudinally of said tank and stationary relative to said tank and frame, means supporting said cover from said frame for slight limited oscillation relative thereto about a second horizontal axis extending longitudinally of said tank, said end walls of said tank including generally isoclinal trapezoidal-shaped upper extensions and said end walls of said cover including complementary similar shape and size downwardly opening recesses in which said extensions are received when said cover is closed. ### Claim 2 (depends on 1) The combination of claim 1 including fluid cylinder means operatively connected between said tank and said lift frame for opening and closing said cover. ### Claim 3 (depends on 1) The combination of claim 1 wherein said tank includes a lower fluid drain outlet opening. ### Claim 4 (depends on 1) The combination of claim 1 wherein said tank includes opposite longitudinally extending support bars adjacent and inwardly of the upper marginal edges of said side walls, said frames including opposite side support lugs slidably engaged with and supported from said bars. ### Claim 5 (depends on 4) The combination of claim 4 wherein said movable head includes opposite side support lugs slidably engaged with and supported from said bars. ### Claim 6 (depends on 1) The combination of claim 1 wherein said tank includes lower opposite side longitudinally filter panel extending support rods, each of said support rods being adjustable in length, a pair of opposite end abutments supported from the opposite ends of each rod and abbutingly engageable with the inner-surfaces of the corresponding sidewalls of said tank. ### Claim 7 (depends on 6) The combination of claim 6 wherein said tank includes opposite longitudinally extending support bars adjacent and inwardly of the upper marginal edges of said side walls, said frames including opposite side support lugs slidably engaged with and supported from said bars. ### Claim 8 (depends on 1) The combination of claim 1 including means operatively connected between said tank and lift frame for swinging the latter between the open and closed positions of said cover.