| 摘要 |
FIELD: transport. ^ SUBSTANCE: invention relates to device for adjusting height of vehicle seat. The brake drum contains gear unit having driving gear, the first fixing section, gear retainer, the second fixing section attached to shaft, receptacle cover, main torsion spring, the first and the second ancillary torsion springs. In the central part of the gear unit there is a hole for the shaft. The first fixing section is executed with the first and the second projecting sections mutually spaced for 180. The gear retainer is fitted with shaft one end of which is inserted into the hole for shaft and the other end has coupling section attached to handle. On the outer periphery of the second fixing section there are the first and the second grooves. At both ends of the first and the second grooves the first and the second catching sections are made. One side of receptacle cover is open, and the other its side is made with coupling hole into which the shaft is inserted. Inside the coupling hole there is elongated section. The gear unit and the gear retainer are inserted into the cover and its outer side is fixed. The main torsion spring is located on outer periphery of the second fixing section. Herewith, both its ends are located near the first catching section so that torque force develops to rotate the gear retainer when the shaft is rotating. The first ancillary torsion spring is located on outer periphery of the second fixing section. One of its ends is attached to the second projecting section and the other end is located near the second catching section. The second ancillary torsion spring is located on outer periphery of elongated section. One end of this spring is attached to the first projecting section and the other end is located near the second catching section. Play in both directions of driving gear rotation is prevented by braking force arising when the first and the second ancillary torsion springs are sliding during shaft rotation. ^ EFFECT: prevention of play in brake drum rotation direction. ^ 4 cl, 11 dwg |
