Abstract: A vinyl window or door screen frame which does not require clips or hooks for installation. The frame contains corner keys formed at angles greater than 91.degree. which provide a slight bow along each side of the screen frame. This feature allows the screen frame to fit snugly into the window frame. The use of vinyl makes the screen frame flexibly rigid and thus allows for the bow in the frame. The frame stays in place due to the compression force between the window frame and the bowed edges of the screen frame.

Abstract: A decorative window covering provides privacy on sliding glass doors or windows without altering the walls surrounding the door or window. These privacy screens are functional as well as decorative and can remain within a sliding window or door frame when opening or closing the window or door.

Abstract: A security screen with a main frame having radial sections which interconnect with radial sections of a subframe when the screen is closed to strengthen the screen and increase its resistance to displacement due to sustained or impact loads. Brackets attached to the radial sections of the main frame have pins aligned to fit into holes in the radial sections of the subframe when the screen is closed. The brackets and pins serve to prevent the radial section of the main frame from bending inward under a force applied to the screen cloth by effectively combining the strength and rigidity of the main frame and subframe. Thus, the force required to displace the screen cloth a given distance is increased. The increase in strength and rigidity is accomplished without increasing the dimensions of the screen or its supporting structure. Also, the brackets serve to inhibit the security screen from being pried open. Other means to interconnect sections of the main frame and subframe are disclosed.

Abstract: A flex holder for retaining a flexible sign face material to a sign casing. The flex holder comprises a body having a longitudinal axis and a hinge extending along the longitudinal axis. An elongated tongue is connected to the hinge and a groove is formed in the body along a projection of the tongue about the hinge. The tongue has a pair of notches therein such that when the tongue is bent over a flexible sign face material and engaged in the groove, the flexible face material is held transversely to the body by an engagement of the tongue and groove and is held longitudinally to the body by a friction of the flexible sign face material between the notches and the groove.

Abstract: A push to exit, pull to enter latch assembly is disclosed, particularly suitable as a screen door latch for a recreational vehicle door assembly having a main closure door and a screen door. The latch assembly comprises a latch housing, a latch bolt linearly slidable from a latching position to an unlatching position, a push-to-release lever mounted on one side of the latch housing and a pull-to-release lever mounted on an opposite side of the latch housing. In certain preferred embodiments each release lever has a handle and a latch bolt engagement flange. Rotation of either release lever from its normal position to its releasing position forces the corresponding latch bolt engagement flange against the latch bolt, urging the latch bolt from the latching position to the unlatching position. The latch assembly may cooperate with a screen to close an opening in a pivotable screen door.

Abstract: A new exterior skylight solar screen cover for engaging a skylight to prevent excessive heat build-up in a space below a skylight which has a frame, the solar screen comprising a frame member dimensioned for coupling with the exterior of the skylight. A plurality of louvers laterally extend within the frame member and a solar screen panel is dimensioned for being received within the frame member. The solar screen panel comprises a peripheral frame that is positioned on an inwardly extending lip of the upper frame section of the solar screen cover.

Abstract: A barrier for delimiting spaces, indicating paths, pointing out dangers and the like, comprising a tubular frame which has a closed shape and to which a sheet-like element made of extruded plastics and closed in a loop can be applied, the sheet-like element being anchored to two mutually opposite portions of the frame by shrinkage produced by a thermal treatment.

Abstract: An elongated frame member and a rectangular screen frame assembly including the frame member having a unique cross sectional shape of the frame member for the reception and retention of flexible fiberglass or other types of screening material without requiring a separate spline or locking strip component. The uniform frame member cross section includes a substantially box or rectangular shaped main portion and substantially U-shaped portion positioned adjacent said main portion, said U-shaped portion including spaced apart first and second side walls and a bottom wall therebetween. Each first side wall is preferably substantially common with or defined by one surface of said main portion.

Abstract: A recites full view door in which the frame portion is totally molded. It may be molded in a number of processes from polypropylene or other materials, with or without additives, and other plastics suitable for large molded frames. There is an outside section of the frame and an inside section which are modified for securement each to the other. Provision is made in the interior edges of the frame for receiving the pane of glass, and then a holding assembly is provided, primarily four pieces being top, bottom and the two sides which snap-fits into the inside portion of the frame and secures the window in removable engagement to the door. In the method, means are provided on the outer half and the inner half for snap-fittingly or press-fittingly engaging each other. In addition, sonic welding, gluing, and other means for securing the outer half and the inner half of the door are contemplated.

Abstract: Disclosed is a top mounted interior door closer utilizing as a drive mechanism a yieldable actuator which is exercised during the opening and retraction which is desirably mounted in an encasement having a closing rod extending from one end. The closing rod is secured to a pair of flanking members along a vertical axis, which members, in turn, are positioned for movement in a track. The closer is sandwiched in place interiorly by having elongate slot at the top of the door means of a cover plate. The elongate slot passes a closing link pin pivotally secured to the shaft or bushing joining the rollers or blocks.

Abstract: A storm door includes a frame with opposing side rails, top and bottom rails, and a center mullion. A kick plate is mounted between the center mullion and bottom rail, and a stationary screen sash and stationary window panel are mounted within the same vertical plane between the center mullion and top rail. A window sash is slidably mounted between a pair of jamb liners on the side rails between the center mullion and top rail, and spaced inwardly of the screen sash and stationary window panel. Counterbalance assemblies are connected to the window sash and located between the jamb liners and side rails to permit retention of the window sash at any position between an upper position contacting the top rail, and the lower position contacting the center mullion.

Abstract: An assembly for opening a door latch used in combination with a door, wherein the assembly includes a push-bar with an end piece that envelopes the door latch, the end piece being integrally connected to the bar at one of its ends and, connected at the other end to a spring which holds the assembly outward and away from the door, the other end of the spring is fastened to the door.

Abstract: A light weight, upholstered panel for use in modular and free standing office landscaping systems. The panels form free standing partitions which can be rearranged and assembled into an office system. Panels can be interconnected and positioned over a range of angles relative to adjacent panels. The panel core is composed of a light weight composite structural material with perimeter frame members along each edge. Each frame member has the same cross-section along its length. The horizontal perimeter horizontal frame members are inter-connected with the vertical frame members by corner connectors. The corner connectors have protrusions which engage hollow cavities in the ends of the frame members. The perimeter frame acts to transfer loads imposed on the panel to the structural core. The perimeter frame members incorporate formations to secure the panel fabric, trim and the inter-panel connection system in place and provide recesses for fasteners and support hardware.

Abstract: A frame construct for holding at least one planar mesh or membrane in set-apart relationship from a structural port(a1). Individual frame pieces, top, bottom and sides, are cut to desired lengths and joined to form a glazable frame. Shapes other than of rectangular geometry are obtainable through use of variously angled joiners. Peripheral grooving on both frame faces is receptive of a spline that secures the planar mesh or membrane to the frame, which is then dogged to or otherwise secured in place on/over an opening such as a window, door or the like. Corner elements of the construct also serve as joiners; and, one spline may also comprise a weather strip.

Abstract: Presented is a pet door for screen applications with framing members similar to that used in existing screen doors and screen windows. The pet door comprises interchangeable and reversible parts capable of being combined in a manner to acheive a configuration adaptable to the various types of screen frames that the device is installed on. To provide a rigid attachment of the pet door to the existing screen frame, mounting brackets are used. When installed, the pet door provides a rigid and safe access for pets to enter or exit a residence.

Abstract: An apparatus and system for tensioning and securing the edges of a flexible sign panel to a frame or housing. Clip mechanisms formed from a pair of interlocking clip members are secured to the sign panel along its edges. The clip members include an insertion member and a mating generally "U" or "C"-shaped securing member. The clip mechanisms are hooked to the frame or housing by mating elongated ridge members. A clamping tool is used to mate the ridge member on the clip mechanisms with the ridge member on the frame members. Edge trim cap members clip onto the frame extensions and clip mechanisms to finish the edges of the sign assembly.

Abstract: A security gate for positioning within an area way such as a doorway. The gate includes a support structure defined by a frame and a flexible panel supported by the frame. The frame includes horizontal members and vertical members detachable engaged with the horizontal members. One end of the horizontal members includes a lock assembly including a pivoting linkage defining a parallelogram structure for facilitating firm engagement of the horizontal members with opposing sides of the doorway.

Abstract: A sheet molded compound (SMC) which is a fiberglass reinforced composite material, produced in a sheet format, for forming a door, is disclosed. The material includes strands of oriented chopped fiberglass in combination with a resin, filler paste, and desirably an inert material such as talc in concentrations to and including up to approximately 40% of the composition. The SMC is subjected to matched molding, male and female, into a configuration in which one-half includes the window recess, a track for the same, the track being conformed by virtue of an offset for a screen as well. The entire door, is subsequently filled with foam to secure the two halves together. A closer recess, pocket for a lock, and screen and window mounting means are also disclosed.

Abstract: A molding system having a mechanism for securing an air barrier across the area bounded by the molding system. The molding system comprises: a bracket member and a retaining cap strip. The bracket member has a bracket width, a longitudinal axis, and a first grooved channel formed therein. The first grooved channel is oriented substantially in parallel with the longitudinal axis and has a predetermined maximum groove width. In use, the bracket member is secured to the frame work which forms the window, or other opening, with nails, screws or other fastening devices. The retaining cap strip has a cap member and an insertion member. The insertion member is dimensioned in a manner such that a terminal section of the insertion member is insertable into the first grooved channel and retained therein by contact between a portion of the terminal section and a portion of the bracket member defining the grooved channel. The cap member has a cap width greater than the predetermined maximum groove width.

Abstract: A window screen frame includes at least one corner key which has, as an integral component, a stop that prevents the screen frame from penetrating too deeply into tracks in a window jamb. The corner key is preferably molded plastic and includes two legs, each supporting a raised member. The legs meet at an angle to form the corner and the raised members form the stop. In a preferred embodiment, the raised members meet at the corner to form a corner-shaped stop. One or more of the corner keys may also include integral handles, for moving the frame along tracks in the window jamb. The corner keys may further include retreats for receiving locking pins. The locking pins extend through the window frame and into the retreats to retain the window screen frame in a desired position. A window screen frame including at least one of these corner keys also includes frame segments that mate with the corner key.

Abstract: A security gate for positioning within an area way such as a doorway. The gate includes a support structure defined by a frame and a flexible panel supported by the frame. The frame includes horizontal members and vertical members wherein the vertical members may be conveniently folded to a position parallel to the horizontal members whereby the gate is folded to a compact configuration for transportation or storage.

Abstract: A decorative window covering provides privacy on sliding glass doors or windows without altering the walls surrounding the door or window. These privacy screens are functional as well as decorative, are removably attached to the window or door, and can remain within a sliding window or door frame when opening or closing the window or door.

Abstract: An element for protecting a screen against damage by fingers for example during grasping a handle, includes a main portion arranged to cover an area of the screen adjacent to the handle, and a mounting portion connected with the main portion and attachable to a screen carrier. The protective element is cantilevered over and spaced apart from the screen, so that the screen can move under adverse weather conditions without risk of tearing.

Abstract: Improvements to the design of metal frames of security screens are disclosed. The improvement, each of which may be applied individually or in conjunction with any combination or all of the other improvements, include a retainer groove in the frame into which is inserted the ends of the screen mesh and of a tension retainer bar to prevent the mesh and bar from pulling away from the screen frame when a force is applied against the screen mesh, a second line of tension retainer bar fasteners, grooves on the retainer wall of the tension retainer bar to prevent fasteners from slipping during insertion, vinyl or felt extender tongues extending from the frame perpendicularly to each other, refinements to the design of the screen frame to maintain the structural integrity of the screen frame while accommodating the aforesaid retainer groove, and the insertion of the ends of a center brace into slots in the outside frame members or the use of insertion keys to better secure the center brace.

Abstract: An improved window screen in which each strand of the screen is substantially totally transparent is disclosed. In all cases the screen comprises a plurality of optically transparent strands with selected strands intersecting at an angle to form the screen. The strands may be woven or the strands may be bonded at their intersections to form the screen. Light passes through the strands in a distortion free manner. The strands of the screen may either be conventional optical fibers or merely of transparent plastic.

Abstract: A construction for supporting a flexible sheet is disclosed which includes a U-shaped channel having opposing flanges that are adapted to receive a complimentary spline member for frictionally engaging a flexible sheet, such as window screen, between a surface of the spline member and an adjacent inner surface of one flange of the U-shaped channel. The structure has several practical applications including the construction of window screens, electrostatic air filters of the charged media type, storm windows of plastic film and the like. An improved construction for an electrostatic air filter of the charged media type is also disclosed.

Abstract: A screen enclosure apparatus, for use in screened windows, porches, doors and other screened-in builiding structures, capable of controllably breaking away upon excessive impact of resultant wind pressures on the frame of the apparatus. A frame structure having a channel running along the frame's length, serves to releasably or frangibly receive spline material which displaces or fractures at a predetermined resultant pressure. The spline serves to releasably secure a screen sheet, within the channel of the frame itself, so as to preclude damage which would otherwise occur not only to the screen sheet, but also to the supporting frame structures, when such high wind pressures are exerted thereon--to reduce the structural rigidity requirements for such frames.

Abstract: A panel fabric fastening system is disclosed which includes fastening devices mounted along the edges of the panel, each of which includes a plurality of pointed elements. Fabric is stretched over the panel and is engaged by the pointed elements to retain the fabric in a stretched position over the sides of the panel. A cap device may be installed over the fastening devices to cover the ends of the fabric and provide an aesthetic finish. The fastening devices may be easily installed and removed.

Abstract: A one-piece sealed, hollow, steel sliding screen door frame and method of fabrication thereof is described. A flat steel strip is diecut to produce 45.degree. miter cuts, each having an opposing flap. The cut strip is rolled to produce a frame stock having an essentially rectangular profile. Longitudinal edges of the strip are folded together, crimped and bonded during the rolling and form a screen channel in the frame stock. The frame stock is bent at right angles at the miter cuts such that the flaps tuck under the miter cuts, forming a rectangular door frame. Epoxy is used to bond the flaps to the inner surfaces adjacent the miter cuts. A screen door assembled using the door frame includes self-centering wheel assemblies.

Abstract: A barrier shield against exposure to environmental contaminants comprises a frame assembly for tensionally retaining a thin resilient film for protection of dental, medical and laboratory workers from sprayed or spattered debris and fluid from the work area, such as a patient's mouth or surgical site. The frame assembly is constructed and mounted so that it may be positionally adjusted by means of a flexible support.

Abstract: A framing system for paintings comprises a foam plastic board surrounded by a channel in gripping engagement. The channel is provided with a pocket around the outer wall into which canvas can be tucked and gripped. The channel has a slot on the underside for receiving a mating wall of a framing member which extends above the opening to the pocket to provide a decorative mask.

Abstract: Improvements to the design of metal frames of security screens are disclosed. The improvements, each of which may be applied individually or in conjunction with any combination or all of the other improvements, include a retainer groove in the frame into which is inserted the ends of the screen mesh and of a tension retainer bar to prevent the mesh and bar from pulling away from the screen frame when a force is applied against the screen mesh, a second line of tension retainer bar fasteners, grooves on the retainer wall of the tension retainer bar to prevent fasteners from slipping during insertion, vinyl or felt extender tongues extending from the frame perpendicularly to each other, refinements to the design of the screen frame to maintain the structural integrity of the screen frame while accommodating the aforesaid retainer groove, and the insertion of the ends of a center brace into slots in the outside frame members or the use of insertion keys to better secure the center brace.

Abstract: This invention relates to a window assembly with a window frame having a first window sash mounted fixedly in the frame and a second window sash mounted for movement between a closed position and at least one open position in parallel relation to the first sash. The window frame has a main frame and an auxiliary frame that mates with the main frame to define a common frame outline and to combine with at least one of the sash to define guideways to guide the second sash as it moves between the closed position and an open position.

Abstract: A window screen assembly for use in over-the-road trucks and other vehicles. A fine-meshed screen is mounted on a one-piece molded frame and lattice arrangement constructed of a very strong plastic. The assembly is adaptable to many window opening sizes by cropping excess width off one end in order for the assembly to slide into the door window tracks. The top edge of the windowpane holds the frame up against the top of the window opening. The top rear of the frame conforms to the rounded corner of the window opening, and the lower rear of the frame extends over the rounded corner of the windowpane.

Abstract: A reusable factory fixture frame is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and a tensed foil shadow mask. The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse. The frame includes a generally rectangular frame structure having grooves thereabout for receiving an edge of the shadow mask. At least one elongatge rod-like member extending lengthwise of and complementarily mating with the grooves temporarily and removably support an in-process shadow mask in tension. The shadow mask is heated and allowed to expand prior to being temporarily and removably supported on the frame, and the shadow mask is allowed to cool and shrink in tension while so being supported to effect tensing of the shadow mask in clamped condition on the frame.

Abstract: A reusable factory fixture frame is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and a tensed foil shadow mask. The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse. The frame includes a generally rectangular frame structure having grooves thereabout for receiving an edge of the shadow mask. Spring-loaded mechanical mask-retaining devices are secured to the side of the factory fixture frame for temporarily and removably supporting the in-process shadow mask in tension in the grooves. The shadow mask is heated and allowed to expand prior to being temporarily and removably supported on the frame, and the shadow mask is allowed to cool and shrink in tension while so being supported to effect tensing of the shadow mask in clamped condition on the frame.

Abstract: A reusable factory fixture frame is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and a tensed foil shadow mask. The frame provides for mounting an in-process shadow mask during photoexposure of an in-process faceplate in a lighthouse. The frame comprises generally rectangular frame means and quick-release mechanical mask-retaining means for temporarily and removably supporting an in-process shadow mask in tension. The frame has at least first six-point indexing means on a first side for registration with complementary registration-affording means on an exposure lighthouse, and second six-point indexing means on a second, opposed side for registration with complementary registration-affording means on an in-process faceplate. As a result, the in-process shadow mask can be precisely registered and re-registered with the lighthouse and the in-process faceplate for the photoexposure of the in-process faceplate while retaining the in-process shadow mask in tension.

Abstract: An extruded sign frame section for use with flexible sign facing. The flexible sign face material (2) is secured by gripping element (8), the gripping element hooking onto knob (29) and permitting the material (2) to be stretched tautly across the sign frame (3). In a preferred embodiment, the extrusion includes a stabilizing element (24) which abuts the material (2), tending to dampen vibration of the sign face when subjected to wind loading. In another embodiment, an inclined member (34) permits the sign face material to be stretched across the frame (31) so as to conceal the extrusion, thereby giving the sign a borderless appearance.

Abstract: A slat for positioning between opposing frame or support members to define at least one surface when a plurality of such slats are thereby positioned comprises a surface defining portion having resilient, substantially closed cavity defining attachment members on each end thereof, the attachment members being biased to a substantially closed positioned yet capable of being resiliently opened to provide access to the cavity defined thereby, said locking structures for securely yet removably locking the attachment members in the substantially closed position. A plurality of slats positioned between opposing frame members of an article of furniture to define at least one load-bearing surface and a plurality of slats positioned between opposing support members to define a protecting surface are also disclosed.

Abstract: A slat for positioning between opposing frame or support members to define at least one surface when a plurality of such slats are thereby positioned comprises a surface defining portion having resilient, substantially closed cavity defining attachment members on each end thereof, the attachment members being biased to the substantially closed position yet capable of being resiliently opened to provide access to the cavity defined thereby. A plurality of slats positioned between opposing frame members of an article of furniture to define at least one load-bearing surface and a plurality of slats positioned between opposing support members to define a protecting surface are also disclosed.

Abstract: A single foil is biaxially stretched on a frame for movement relative thereto by being secured intermittently to a single rubbing strip over a guide ledge. The rubbing strip is stretchable and movable lengthwise of the associated frame side. Torsional forces arising because of the one-sided loading of the frame by the stretched foil are taken up by the frame which is made with a torsionally rigid cross-section.The single foil can be clamped without creasing and in a manner which ensures freedom from creasing notwithstanding differences in the heat expansion of the foil and frame.

Abstract: A cabinet having a loudspeaker window has a mesh screen structure covering the window. This mesh screen structure is made by the use of a plastics molding technique and comprises a plurality of latitudinal threads and a plurality of longitudinal threads molded together to give a shape or appearance similar in all aspects to a woven metal mesh.

Abstract: A stretcher frame for decorative materials used as wall hangings, for artists' canvasses and the like which includes four limbs defining a rectangle, two of which can be folded inwardly at their centers so that the frame can be folded up concertina-fashion. Hinge connections are provided at each corner of the frame and at the mid-points of the folding limbs. The four limbs remain permanently connected by the hinge connections and the folded frame can be easily transported and stored. If the covering material can be folded it can remain in place on the frame when the frame is folded. The hinge connections include flat link members which are normally concealed within slots in the limbs.

Abstract: A window assembly for modifying the appearance of a vehicle body. The window assembly comprises a glass fiber reinforced polyester panel adapted to bridge a body opening. The polyester panel has at least one opening smaller and of a different configuration than the body opening and is formed with a peripheral rabbet projecting into the smaller opening. An insert complementary in shape to the smaller opening is positioned in the latter adjacent the rabbeted periphery. The insert may take the form of a window pane, a louvered panel, a lamp housing lens, or other substantially planar article. The insert is held in place by an injection moldable elastomeric material that in cured condition integrally interlocks the periphery of the insert to the rabbet of the polyester panel.

Abstract: A method for securing caulking driven in a groove for holding down a flexible sheet or filter screen under continually changing temperatures and high pressures comprises, a plurality of 90.degree. angle clips in axial alignment on the spline extending around the periphery of the filter screen with one leg of the clip pressing the spline down and the clip other leg pressing against one higher wall of the groove, and screw means inserted through the 90.degree. clip bisecting the 90.degree. angle between of the clip legs for securely fastening the spline and the filter screen under the spline securly to a filter screen holder for resisting the environmental conditions of continually changing temperatures between 200.degree. and 250.degree. F.

Abstract: A supporting structure, effective to act as a chair seat and/or back, and to be fixed to a chair body, is described which consists of a substantially flat structure, structure having a suitable thickness and being made of a suitable plastics material, the structure having the form of an interlacing of straw stems, or other similar vegetal materials, defining a plurality of holes. The structure may be obtained in any flat geometrical shape, depending on the shape of the frame with which it must be associated, the structure is provided, peripherically, with an upper edge and lower lug, provided, at even spacings, with tabs, the tabs defining an outer tooth effective to engage into suitable slots formed in said structure supporting frame.

Abstract: A screen assembly includes a rectangular mesh sheet with several parallel security strands of insulated conductive wire extending between opposite sides of the sheet. Insulated cross wires lie on a face of the mesh near the opposite sides thereof, are joined by welding or soldering to points on the security strands, and are cut at selected locations to provide a sinuous electrical path through the screen. A spline of insulative material extends around the border of the mesh sheet and encapsulates the locations where the cross wire is joined to the security strands, the spline including upper and lower spline portions lying on opposite faces of the mesh and sealed together through the mesh. A frame for holding the screen includes a pair of frame halves that snap together, with the lower half having an undercut slot that receives a flange at the periphery of the spline, the lower frame half also having a stop surface opposite the undercut slot which abuts the inner edge of the spline.

Abstract: A method for forming a frame from an elongate strip of formable material and products formed thereby are disclosed. The method comprises the steps of notching the side edges of an elongate strip and providing slots in one edge; thereafter deforming the strip along four parallel lines which become the interior corners of frame members having a substantially rectangular cross section. A pair of complementary corner notches, each formed of a particular shape, allow the strip to be folded or deformed transversely of its length dimension, thereby forming a pair of intersecting frame members each having a substantially rectangular cross section defined by a front wall, parallel inside and outside side walls and a pair of flanges. The inside flange and side wall of each frame member provide a plurality of slotted openings spaced equal distances apart to receive the ends of steel rods which are interlaced and form a wire meshed screen.

Abstract: A fly screen for windows and doors comprising fly netting extending over one face of a rectangular frame with the marginal edge of the netting located in a recess in the frame and a wedge strip received in the recess over the fly netting to clamp and retain the fly netting in position. The fly screen may include mounting means for locating fly screen on an existing door or window or the fly screen may include separate mounting means for the frame whereby the fly screen can be mounted to cover an aperture. The fly screen frame comprises four frame elements formed as extrusions of the appropriate section which are cut to length with the adjacent ends being connected by corner cleats so that the fly screen frame can be assembled to suit any size of window or door. The fly netting comprises a material which can be easily cut such as plastic coated fiber-glass.

Abstract: A filter retaining device to prevent a unit filter from inadvertently falling out of a bottom access flow-through housing when the housing is opened to gain access to the interior. Bottom access flow-through filter housings typically include spaced apart elongated channels which slidably receive a unit filter. These channels serve to locate and hold a unit filter in a gas stream passing through the flow-through housing. The filter retaining means is removably attached to the bottom open end of each channel to support the unit filter in the flow-through housing when the bottom access is opened to gain access to the interior of the filter housing.