Abstract: An audiometric booth made from modular acoustic panels is provided. The panels comprise simple yet effective means for connecting the panels together without need for separate fasteners. The simple connector means permit the audiometric booth to be quickly and easily assembled and disassembled without the use of tools, except for attaching the hinges of the door that provides access to the interior of the booth. The panels and associated members coact so that the fully assembled booth has no exposed grooves or openings at the ends or junctions of the various panels and so that the door makes an acoustic seal with the enclosure.

Abstract: An improved automatic door closure is provided for a door which has a door post mounted by two or more members attached to a door jamb. The door closure comprises a roller which is mounted on the door jam, a cam which is mounted on the door post so that it will rotate with the door post but is capable of limited movement relative to the post in an axial direction, and a spring for urging the cam against the roller as the door is swung between open and closed positions. The cam is contoured so as to cause it and the roller to coact with spring arranged to cause the door to return from open to closed position without any operator applied force. In a preferred embodiment of the invention, the door closure apparatus comprises a compression spring for urging the door to close, and an adjustable mechanism for varying the force exerted by that spring.

Abstract: Improved cam hardware for use with a self-positioning door. The cam is attached to the door mounting post by a threaded connection and has a lower surface which is symmetrically inclined about a high point. The lower surface is contacted by a cam follower roller which is rotatably attached to the door jamb. When the door is opened and released, the cam coacts with the cam follower roller to cause the door to return to its original position where the high point is mated with the roller.

Abstract: An improved door having a door nose and a door mounting component which attach to the door panel in a manner which minimizes fastener exposure on the outer surface of the door and reduces cost of assembly.

Abstract: Magnetic door hardware for closing swinging doors. Two magnets are axially aligned with the door post, and the magnetic fields of the magnets are aligned so as to produce a radial torque when the door is swung open. One magnet is attached to the door post, and the other magnet is attached to the door frame so that the radial torque produced by the magnets causes the door to rotate to the closed position.

Abstract: A windowed door is provided with an internal compartment accommodating a window pane having an area at least twice that of the window aperture. The compartment and aperture are eccentrically disposed with respect to one another such that a portion of the pane not previously exposed through the aperture is exposed when the pane is reversed in the compartment.

Abstract: Apparatus is disclosed for use with an automatic closure of the type wherein the closure member, such as a door, returns to a home position when displaced therefrom. The closure member is at least partially supported by a hanger arm secured to a cam follower that rides on a cam track. The cam track forms part of a stationary structure which provides a bearing for a rotatable post. The post may carry further support means for the closure member.

Abstract: An automatic closure is disclosed which is adapted to block the flow of air through a door opening. The closure comprises a pliant curtain supported by its upper edge and by a portion of one side edge. The curtain includes a pocket which contains a bracing panel supported by the flanges of a pair of mutually perpendicular split sleeves. The sleeves are secured to a rotatable post, which normally assumes a preferred rotational position corresponding to the air-blocking position of the curtain in the door opening. The curtain, which also carries weights to facilitate its movement into and out of the latter position, is readily installed on, or removed from, its supporting structure.

Abstract: An acoustical wall assembly comprises at least two modular sound absorbing panels. Each panel includes a substantially flat body and a tongue extending substantially parallel to and spaced from one edge of the body so as to form a channel therebetween. The tongue is provided with a flange portion which extends from the tongue away from the channel. A first connector member having two side plates each extending into a corresponding channel of two modularly-aligned panels, and a second connecting member disposed between the tongues of the adjacent panels, are secured together so as to clamp the flange portions therebetween and secure the two panels together in a coplanar relationship.

Abstract: An air seal is provided for restraining the flow of air through a cut-out section of a door which accommodates a door closing mechanism. A pair of nested cover strips individually flexed to a U-shaped configuration is mounted astride the mechanism, the bight of the outer strip resiliently abutting a vertical surface of the cut-out section in air sealing contact. The inner strip, which has greater resistance to flexing than the outer strip, contacts the side sections of the outer strip to stiffen them against flexing as the door is swung about its support. Both strips terminate in a fringed margin to accommodate the vertical rise of the lower boundary surface of the cut-out section as the door swings away from its closed position.

Abstract: Various improvements of a modular wall assembly of the type having panels with channels formed along the side edges of the panels, are described. The improvements include corner connection means for providing a structurally improved corner connection between two panels, a window frame assembly useful with the panels and yet preserving the modular nature of the modular wall assembly and improved ceiling cap members and floor channel members for facilitating the assembly and disassembly of the wall assembly.

Abstract: A novel acoustical wall assembly comprises at least two modular sound absorbing panels. Each panel includes a substantially flat body and an integral tongue extending substantially parallel to and spaced from one edge of the body so as to form a channel therebetween. A double channel connector, comprising first and second U-shaped channel members, is utilized to connect the panels together in a coplanar relation. The side plates of the first channel member fit into the channels of the confronting edges of two modularly aligned panels, and the side plates of the second channel member fit between the panels in tight fitting relationship with the tongues. An L-shaped connector having two side flanges is used to connect the panels together to form a corner wherein the side flanges of the connector fit into the channels of the confronting edges of two adjacent panels.

Abstract: A door body formed largely of yieldable material has two panels spaced apart with a hollow separator between them that is rectangular in cross section and has two pairs of oppositely disposed sides and two dividers therein at right angles to each other that thereby provide four enclosed openings. This construction holds the paneled portion of the door body firm, especially at the outer edges, yet is flexible enough to permit some distortion when the door is forcibly opened as by striking it vigorously with a moving truck.

Abstract: A receptacle has a cover therefor with connector plates attached to opposite sides of said cover. Slideway guides are attached to opposite sides of said receptacle and they provide runways for channel members that are connected to said connector plates. Rails are pivotally attached to opposite sides of said slideway guides and said channel members slide on them. A stop member on said receptacle terminates the opening movement of the cover.