Patent ID: 7284799

Claim:
An armrest tilting device, comprising; a housing comprising an outer panel with a supporting hole and an inner panel with a passage hole, the two panels of which are coupled with a gap therebetween and in parallel with each other; a ratchet member formed with a plurality of teeth and a jaw and arranged between said panels; a check member comprising a pivotable gear formed with a jaw and teeth for engaging with the jaw and the teeth of said ratchet member and a first torsion coil spring, for resiliently supporting said pivotable gear; a rotational shaft which is rotatably supported in the supporting hole of the outer panel of the housing and passes through the passage hole of the inner panel of the housing, carrying either the ratchet member or the pivotable gear and a rest bar of the armrest fixed on one end thereof; a pivoting control device comprising a fixed cam having a passage hole for receiving said rotational shaft therethrough , one side of which is attached to the outside of the inner panel of said housing and the other side of which is formed with two opposite recesses having a wall and a slant facing each other, a rotational cam fixedly mounted on said rotational shaft, one side of which faces the recesses of said fixed cam and is formed with two opposite protrusions having a wall and a slant for being engaged with the corresponding recesses of said fixed cam, and a second torsion coil spring wound around said rotational shaft and arranged and supported between said rotational cam and the other end of said rotational shaft for pressing said rotational cam against said fixed cam.