Patent ID: 7086632
Filing Date: 2006-08-08
Classification: G10H

Abstract:
1. In a keyboard instrument support having two legs horizontally separated from each other, two outer tubes respectively and obliquely extending out from distal ends of the two legs, two inner tubes slidably received in the two outer tubes respectively, two arms horizontally separated from each other and extending from free ends of the two inner tubes, two connecting tubes with two sliding tubes each slidably received in a corresponding one of the two connecting tubes being securely connected to outer faces of a respective one of the outer tubes and the corresponding one of the inner tubes, wherein distal ends of the two sliding tubes are securely connected to outer faces of one of the outer tubes and one of the inner tubes and each of the connecting tubes is provided with a pivotal plate having an eccentric block integrally formed with the pivotal plate and selectively extendable through the outer face of the connecting tube to engage the outer face of the sliding tube so as to limit the sliding movement of the sliding tubes inside the connecting tubes, wherein the improvements comprise: a first seat and a second seat mounted on a corresponding one of the two outer tubes and respectively composed of two plates to rotatably receive therebetween a roller with multiple bosses formed on an outer periphery of the roller to correspond to a hole adapted to be defined in each of the outer tubes and each boss being received in one of multiple adjusting holes adapted to be defined in each of the inner tubes; a first rotation tube with a first end adjacent to an outer face of the second seat and having an open second end to securely receive therein a second rotation tube having a first end adjacent to an outer face of the first seat, with the first ends of the first and second rotation tubes integrally formed with two extensions, two threaded bolts- integrally formed with each of the extensions and respectively extending through a corresponding one of the rollers sandwiched between the first and second seats; a ratchet firmly connected to the extension of the second rotation tube and selectively rotated to drive the roller in each of the first and second seats to rotate; and means for selectively driving the ratchet to rotate such that the rotation of the roller in the first and second seats lifts or retracts the inner tubes with respect to the outer tubes and the arms are able to move simultaneously to maintain the keyboard instrument placed on top of the two arms horizontal.