Abstract: A boom stand is constructed from a base, extensible stand, pivotal boom support, and boom. The base has arcuately segmented massive anchors that form a perimeter. The arcuately segmented massive anchors are shaped and sized to fit within the perimeter of like bases, to decrease minimum distances between stands during storage or close use, while still providing stability. Over-center clamps provided on the extensible stand are extruded to include unitary cord guides, and are engaged with tube ends to prevent rotation or accidental removal. The pivotal boom support incorporates a disc and elastomeric pads to provide superior locking and vibration reduction, and utilizes in alternative embodiments perimeter and central over-center clamps which further enhance the operation.

Abstract: A boom stand is constructed from a base, extensible stand, pivotal boom support, and boom. The base has arcuately segmented massive anchors that form a perimeter. The arcuately segmented massive anchors are shaped and sized to fit within the perimeter of like bases, to decrease minimum distances between stands during storage or close use, while still providing stability. Over-center clamps provided on the extensible stand are extruded to include unitary cord guides, and are engaged with tube ends to prevent rotation or accidental removal. The pivotal boom support incorporates a disc and elastomeric pads to provide superior locking and vibration reduction, and utilizes in alternative embodiments perimeter and central over-center clamps which further enhance the operation.

Abstract: A boom stand is constructed from a base, extensible stand, pivotal boom support, and boom. The base has arcuately segmented massive anchors that form a perimeter. The arcuately segmented massive anchors are shaped and sized to fit within the perimeter of like bases, to decrease minimum distances between stands during storage or close use, while still providing stability. Over-center clamps provided on the extensible stand are extruded to include unitary cord guides, and are engaged with tube ends to prevent rotation or accidental removal. The pivotal boom support incorporates a disc and elastomeric pads to provide superior locking and vibration reduction, and utilizes in alternative embodiments perimeter and central over-center clamps which further enhance the operation.

Abstract: The present invention discloses a method and apparatus for electronically controlling the movement of one or more animals relative to a selected area. The selected area may be an exclusion area into which an animal is deterred from entering, or may be a confinement area from which the animal is deterred from leaving. The animal is provided with a collar unit, which includes a sensor adapted to sense the strength of electromagnetic signals generated by a generator located in the selected area, and a correction unit adapted to provide correction to the animal in response to a sensor output. The portable unit may report to a central controller which selects a correction strategy, such as level of correction to be applied to the animal approaching the perimeter of the selected area. The controller provides warnings to the user, including warnings for when the battery in the collar unit goes low and when the animal stays in a correction zone for too long.

Abstract: An orchestra shell tower and tower transporter system has a plurality of shell towers comprising an acoustic central panel hingedly connected along its side edges to acoustic wing panels. A generally horizontally rearwardly extending tripod-shaped open base is fixed to the lower end of the central panel and counterweights both the central panel and the wing panels. Vertically adjustable dependent legs with stage engaging members are provided on the tower. A tower transporter has a forwardly extending tripod-shaped open base supported on caster wheels and configured to be received within the base of each of the shell towers. Vertically movable lifters on the transporter base have receptors for engaging the legs of each of the tower shells in lifting relationship and actuatable motors are provided on the transporter for raising and lowering the lifters, and thereby the tower engaged by the transporter for supporting the tower in a raised position for travel.

Abstract: An acoustic shell tower module of sound enhancing character assemblable with other such towers to form an orchestral shell, has a first sound enhancing panel mounted on a generally horizontally rearwardly extending counterweighting base. A second sound enhancing panel is mounted for vertical telescoping movement from a storage position, generally horizontally aligned with the first panel, upwardly to a raised position in which it extends above the first panel to form a sound reflecting and enhancing upper extension thereof, and a system is provided for easily raising and lowering the second panel and retaining it in raised position.

Abstract: A lightweight portable acoustical panel for stage or theatrical use which can be oriented in either an upright position or in a sideways position is provided with a weighted supporting base having a roller thereon which is disposed at one corner only of the panel structure whereby the structure can be easily moved about.

Abstract: A portable stage having plural separable stage units with means for holding adjacent stage units in fixed relation and at the same or different heights, including a pair of elongate grooved members associated one with each stage unit and with clamp mechanism positionable within the grooves of both of said members for imparting rigidity to the adjacent stage units and for holding said stage units locked to each other.