Abstract: A storage cabinet for ignitable (flammable) liquids is provided. The cabinet comprises a flame arrestor assembly having a bung, a perforated disk, a sleeve, and a ceramic filter. The storage cabinet has an inner or an outer wall, and the flame arrestor assembly sets between the inner wall and the outer wall of the cabinet. A method of using a flame arrestor assembly in a storage cabinet for ignitable (flammable) liquids is also provided.

Abstract: In a laboratory hood system having a housing with an access window opening into an interior work chamber for performing laboratory processes, and an air circulation system for creating an air flow from the laboratory environment inwardly through the access window into the work chamber for preventing hazardous materials from escaping into the laboratory environment through the access window, one or more air intake control devices are disposed in a selected location or locations at the access window to overcome any tendency for air turbulence to occur. The air intake control device has an air flow channel extending from an air intake opening to the laboratory environment to an air discharge opening to the work chamber, with a constriction in the channel for causing a venturi-effect increase in air velocity while flowing through the channel to promote non-turbulent air flow entering the work chamber at the selected location or locations.

Abstract: An improved filter mounting mechanism for laboratory work cabinets, especially biological safety cabinets, enables simple and quick removal and replacement of a filter supported in the cabinet housing between a work chamber and a filtration chamber. The filter mounting mechanism includes a stationary filter support surface between the work chamber and the filtration chamber, and a filter clamping surface movable toward and away from the filter support surface between a clamping position relatively proximal to the filter support surface for holding the filter in an operational disposition against the filter support surface and an installation position relatively distal to the filter support surface for permitting insertion and removal of the filter between the filter support and clamping surfaces. An extensible and retractable linkage mechanism, e.g.

Abstract: In a laboratory hood system having a housing with an access window opening into an interior work chamber for performing laboratory processes, and an air circulation system for creating an air flow from the laboratory environment inwardly through the access window into the work chamber for preventing hazardous materials from escaping into the laboratory environment through the access window, one or more air intake control devices are disposed in a selected location or locations at the access window to overcome any tendency for air turbulence to occur. The air intake control device has an air flow channel extending from an air intake opening to the laboratory environment to an air discharge opening to the work chamber, with a constriction in the channel for causing a venturi-effect increase in air velocity while flowing through the channel to promote non-turbulent air flow entering the work chamber at the selected location or locations.

Abstract: An improved filter mounting mechanism for laboratory work cabinets, especially biological safety cabinets, enables simple and quick removal and replacement of a filter supported in the cabinet housing between a work chamber and a filtration chamber. The filter mounting mechanism comprises a stationary filter support surface between the work chamber and the filtration chamber, and a filter clamping surface movable toward and away from the filter support surface between a clamping position relatively proximal to the filter support surface for holding the filter in an operational disposition against the filter support surface and an installation position relatively distal to the filter support surface for permitting insertion and removal of the filter between the filter support and clamping surfaces. An extensible and retractable linkage mechanism, e.g.

Abstract: A ductless laboratory hood apparatus includes a housing defining an interior work chamber, a filtration chamber, an access window opening into the work chamber from an ambient laboratory environment, and an exhaust outlet opening from the filtration chamber into the laboratory environment, a filter system disposed between the work and filtration chambers, and an air circulation system for creating and directing an airstream to flow from the laboratory environment through the access window, the work chamber, the filter system, the filtration chamber, and the exhaust outlet to return into the laboratory environment. The filter system has both a main filter whose constituent material is highly efficient but is also degradable if exposed directly to laboratory processes, and an attenuation filter disposed between the work chamber and the main filter to intercept and attenuate laboratory processes that potentially degrade the main filter, thereby preventing degradation of the main filter.

Abstract: A biological safety cabinet with several air flow directional control enhancements. A perforated air intake grille within the work chamber inwardly adjacent the user access opening has a forwardly facing make-up air intake surface and a rearwardly facing internal air intake surface angled in converging relation to promote a physical division between intake of ambient air and internal air into the cabinet's air recirculation system. An aerodynamic user arm rest is affixed to a support stand to extend alongside the access opening at a spacing outwardly from the housing to assist in directing make-up air to the ambient air intake opening without cross-contamination between the arm rest and the work chamber. An air transmission grille above the work chamber has a horizontal main extent terminating at a spacing from the sash and an upwardly angled extent adjacent the sash to direct increased laminar air flow downwardly along the sash.

Abstract: An improved system and method for monitoring contamination loading of a filter in a biological safety cabinet comprising a housing defining a work chamber and a filtration chamber, a system for circulating air between the work chamber and the filtration chamber via a fan which draws air under negative pressure from the work chamber and delivers the air under positive pressure through the filter and into the filtration chamber. The filter monitoring system determines a pressure differential between the negative and positive air pressure at opposite sides of the fan, and evaluates the degree of contamination loading of the filter on the basis of the pressure differential. An air flow baffle is disposed within the filtration chamber adjacent the fan for dividing the pressurized air delivered by the fan and partially redirecting a portion thereof for more uniformly delivering the air to the filter.

Abstract: A shelf support system that includes a shelf member having a flat support surface, and a flange adjacent at least one end of the support surface that includes a downwardly extending wall portion and an inwardly extending wall portion connected thereto, the inwardly extending wall portion having an edge formed with a notch having a predetermined width. At least one support bracket includes a U-shaped mounting flange having an upwardly extending connecting wall that includes a spacer wall portion having a predetermined width and an engagement wall portion that is connected to the spacer wall portion and that extends beyond the predetermined width of the spacer wall portion. The support bracket is connected to the shelf member by positioning the U-shaped mounting flange of the support bracket within the wall portions of the shelf member to provide a secure connection without the use of tools.

Abstract: A counterweight apparatus is provided for automatically self-returning an enclosure sash or other closure member to at least one preselected intermediate position when released after being opened beyond that intermediate position and for selectively maintaining the closure member in at-rest positions, when released, between that intermediate position and a fully closed position.

Abstract: A mold (10) for molding thin resin sheets includes a center mold plate (12) and two side mold plates (14, 16) disposed on opposite sides of the center mold plate. The mold plates are oriented generally vertically and parallel to each other, and the side mold plates are narrowly spaced from the center mold plate to define a pair of generally vertical mold cavities (18, 20) on either side of the center mold plate. The side mold plates may optionally include recesses (51) in their generally planar mold surfaces (38, 40) adjacent at least one longitudinal edge of the plate, for molding thin resin sheets with integral edge flanges. The mold includes spacer strips (46, 47) for spacing the side mold plates a precise distance from the center mold plate and parallel thereto. The mold thus permits molding of thin resin sheets having precisely controlled uniform thickness.

Abstract: A support assembly for a furniture system including a pair of standards which extend vertically in spaced relation, each standard having two rows of openings formed therein to extend vertically in spaced relation to one another, with the outermost rows on the pairs of standards having a first spacing therebetween and the innermost rows having a second spacing therebetween less than the first spacing. A first support member is mounted on the standards by a first arrangement for detachably mounting disposed in the outermost rows of openings, and the first support member has a first support surface which extends outwardly from the standards and braces which extend vertically along the standards.

Abstract: A support post for use in a system of modular furniture, including a pair of vertically elongated post sections, with each post section including two opposed end portions in a longitudinally oriented front face portion, each of the front face portions including a mounting arrangement for mounting modular furniture components therein, and each of the end portions defining an opening and opening walls constructed and configured to releasably engage a splicing member or a foot member for splicing together of the post sections and upright positioning of the support post.

Abstract: An integrated raceway component for use in a modular furniture system which includes a pair of longitudinally extending channel members disposed in spaced parallel relationship to one another, each channel member having wall portions defining an open cavity for storing one or more wires therein and having extending end portions that form a longitudinally extending slot for receiving such wires. The end portions are formed to receive and support a mounting fastener within the cavity and resilient brushes are mounted in the end portions to extend across the slot. A connecting wall portion connects the channel members with a space therebetween, and a wire raceway members is received between the channel members. The wire raceway is slidably inserted between said channel members and retained thereat, and the wire raceway includes a cover plate having electrical outlets therein.

Abstract: A drawer head which is readily removable and replaceable from the front of a conventional drawer body is disclosed. The drawer head generally takes the form of a rectangular cover panel sized to cover the front panel of a drawer body. An arcuate handle extends outwardly along the top of the cover panel for allowing a user to easily grip the drawer head in order to slide the drawer in and out of a cabinet. The drawer head includes an elongated slot extending substantially between the sides of cover panel and being adapted to receive a header flange of a drawer body. To attach the drawer head to a conventional drawer body, the header flange of the drawer body is inserted through the elongated slot so that the header flange supports the drawer head with the drawer head in a contiguous relationship with the front panel of the drawer body. Fasteners are then used to secure the bottom of the drawer head to the drawer body.

Abstract: A roller bearing assembly for a drawer slide providing a roller wheel having a threaded bore therethrough and a stud adjustably threaded into said bore, the stud attachable at an opposite end to either an interior wall channel of a cabinet or to a drawer, and said roller wheel rollable on a bracket provided on a respective other of said interior wall of the cabinet or the drawer. The lateral position of the roller wheel with respect to the cabinet or the drawer can be adjusted by selectively progressing the threaded stud into the threaded bore. The stud can be progressed into the bore by turning a hexagonal portion of the roller wheel surrounding the bore. The stud is typically anchored to the cabinet or drawer by insertion through an aperture and by deforming an end of the stud rivet style.