Abstract: An articulating accessory cartridge for use in theatrical and commercial lighting fixtures in which optical accessories are utilized. The cartridge includes an outer member removably insertable in the fixture and an inner member telescopically retained in the outer member. One or several optical accessories can be removably received and retained in the inner member in an axial stack, depending upon effects desired. The inner cartridge member is telescopically extended before the cartridge is mounted on the fixture. As the cartridge is inserted, the uppermost accessory engages the end of a reflector associated with a light source in the fixture. Continued insertion of the cartridge results in telescopic retraction of the inner cartridge member, depending upon the number of accessories in the stack, until the outer cartridge member is fully seated. The accessories are held against the end of the reflector for optimal efficiency of the lighting and lighting effects.

Abstract: A narrow angle LED illuminated spotlight in which the light-emitting output of an LED light source is coupled with an optic element, in the form of a focusing reflector or focusing lens, and a masking element is interposed between the light source and the optic element to partially mask off the output area of the light source and significantly reduce the area of the emitted light reaching the optic element. This enables the light passed by the masking element to be concentrated into a, narrow beam (i.e., 18° or less) using an optic element of much smaller size than otherwise, thus making the use of an LED light source module a practical source of light for narrow beam spotlights.

Abstract: A narrow angle LED illuminated spotlight in which the light-emitting output of an LED light source is coupled with an optic element, in the form of a focusing reflector or focusing lens, and a masking element is interposed between the light source and the optic element to partially mask off the output area of the light source and significantly reduce the area of the emitted light reaching the optic element. This enables the light passed by the masking element to be concentrated into a, narrow beam (i.e., 18° or less) using an optic element of much smaller size than otherwise, thus making the use of an LED light source module a practical source of light for narrow beam spotlights.

Abstract: An adjustable track lighting fixture of a type having rotary locking lever for securing the fixture to a bus bar, where the locking lever is economically formed with an internal confinement facility of removably housing an Allen key to be retained with the fixture and used for locking the adjustments of the fixture when desired. A spring, also housed internally of the locking lever, resiliently but releasably retains the Allen key until purposefully withdrawn by a workman. The key is returned to its confinement after the workman has finished using it for the purposes intended. The key is retained in an inconspicuous manner but nevertheless visible to the workman and readily extracted for use when desired.

Abstract: An electrical busway system comprising a busway uniquely configured for cutting to length in the field. Special connector devices are also disclosed, with features for engaging and immobilizing busway insulators to assure accurate initial alignment of conductors and contact elements prior to joining of connector devices with busway sections. An accessory device, specially adapted to the new busway design, includes a rotatable contact element, slideably received in its rotatable support, which progressively displaces a spring as the contact element is rotated into contact with a busbar carried by a busway insulator. Good electrical contact at both ends of the slideable contact element is assured.

Abstract: The invention is a process for epoxidizing an olefin with hydrogen and oxygen in the presence of a catalyst comprising a noble metal and a titanium or vanadium zeolite in a solvent mixture comprising water, methanol, and a C3-C6 aliphatic ketone. This process surprisingly gives significantly reduced by-product glycol and glycol ethers formed by the unwanted ring-opening of epoxides.

Abstract: An aqueous stream containing propylene glycol and/or ethers thereof is treated by counter current liquid-liquid extraction with propylene and/or propane to separate the propylene glycol and/or ether from the aqueous stream.

Abstract: A seating unit comprising supporting structure such as legs or a pedestal and seat only, or supporting structure and seat and back and connecting members, the latter of which may be shaped as arms. The entire structure preferably is formed of a single sheet of bendable or foldable material such as sheet metal. All surfaces of the seating unit are of the types of those ruled surfaces which are developable. Such surfaces are either: (a) plane; or (b) single-curved surfaces, namely cylindrical, conical and convolute; or (c) combinations of (a) and (b). The entire structure is characterized by the absence of any surfaces which are nondevelopable, whereby starting with a flat bendable or foldable sheet of material a seating unit having a seat and supporting structure may be integrally formed without stretching, crumpling, or tearing the sheet.

Abstract: A new process of folding sheet metal to form various kinds of structures. The characteristic feature of each of the structures capable of being formed by the invention is that they are developable without slitting and have at least two adjacent surface segments which together, or in combination with each other if more than two are present, form a complex surface, developable without slitting. The structure consists of one or more of the types of surfaces known as plane, cylindrical, conical and convolute surfaces arranged in such relation that straight bend lines upon the complex surface and the images thereof when projected on the pattern meet within the confines of the surface and pattern at other than a straight line extending from edge to edge of the complex surface and pattern, respectively. A specific form of the apparatus particularly adapted for carrying out the process also is disclosed. The principles of this apparatus may be used to form various useful objects, by the method described and claimed.