Headrest apparatus

Claim 1

A headrest apparatus, comprising: a seatback frame having a top portion and an aperture formed in said top portion; a rail fixedly extending downward from said top portion of said frame; a support member slidably mounted on said rail; a stay guide member movably positioned within said aperture of said frame, said guide member having a central hole therethrough and a bottom end extending below said top portion of said frame; a spring disposed between said guide member and said frame to bias said guide member upwardly relative to said top portion of said frame; a stay disposed in said hole of said guide member, said stay having a top end on which a headrest is mounted and a bottom end supported by said support member such that the height of said headrest is adjustable in accordance with sliding movement of said support member relative said rail, said bottom portion of said stay having a first recess formed therein; a leaf spring having a proximal end and a distal end, said proximal end being mounted on said support member and said distal end being biased against said bottom end of said stay; a locking plate slidably mounted in a slit formed in said support member, said locking plate having an aperture through which an extreme end portion of said distal end of said leaf spring extends; wherein one end of said locking plate is biasedly inserted into said recess of said bottom portion of said stay by said leaf spring when said stay is supported by said support member to thereby lock said stay relative to said support member, and wherein said locking plate is removable from said recess by downward movement of guide member and corresponding contact of said bottom end of said guide member with said leaf spring to thereby move the distal end of said leaf spring away from said stay and withdraw said locking plate from said recess to permit withdrawal of said stay through the hole of said guide member.