For musicians with portable keyboards, adjusting the height of the keyboard from a sitting to a standing position normally requires removing the keyboard and performing a series of hit-or-miss adjustments to identify preferred positions. Once these sweet spots are found, notches help simplify the process for the future — but the keyboard still has to be removed. If two different musicians played the instrument, the process gets even worse. SOLIDSTAND engineers solved the problem with the FREEDOM keyboard stand using a linear actuator from LINAK.
The LA31 Homeline actuator chosen for the stand has a 115 mm (4.53-inches) stroke and the ability to support and move a 6000N (1,200-lb) load in the thrust mode. With the brake function used in this application, the unit’s capability is 1,500N. The low-voltage dc actuator consists of a motor, a gear and a spindle including a nut. With adjustment capability from 25 1/8-inch (plus the height of keyboard) for the lowest height to 43 3/4-inch (plus the height of keyboard) for its highest point, the FREEDOM stand’s transition takes a mere 19 seconds to move units weighing up to 200 lb.
The control box for the LA31 converts 120V ac to 24V dc. A foot pedal control precisely adjusts the height of the keyboard to the desired standing or sitting position for one or more musicians — without stopping the music. Even though the band’s music could exceed the threshold of pain (130 dB), the actuator’s maximum sound level is 45 dBA (using DS/EN ISO 3746 method with the actuator not loaded). Thermoplastic rubber motor mounts and acoustic insulation in the actuator provide quiet operation. An end-stop switch cuts off current to the motor at the end of its travel and Electronic Overload Protection prevents damage to the motor from improper use. By design, the control box short circuits the motor terminals of the actuator when it is not running to avoid inadvertent movement and provide additional protection.
Hitting The High Notes With Ease The 35-lb SOLIDSTAND easily lifts keyboards weighing up to 200 lb a distance of over 18 inches in just 19 seconds using a 1,500N linear actuator.
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