Headrest for vehicles

Claim 2

For use with the backrest of a vehicle seat, an angularly adjustable head restraint assembly comprising a post carried by and mounted interiorly of the backrest and projecting exteriorly therefrom at the upper end thereof, headrest means pivotally connected to said post and adapted to being manually pivotally moved from a horizontally oriented reclined attitude to a vertically oriented head support attitude, slot means formed in said post, cam means pivotally connected to said post and adapted to being pivotally moved into and out of said slot means, a locking lever pivotally connected to said headrest means adjacent said cam means, projection means formed on an upper portion of said locking lever, overcenter spring means operatively connected to said cam means, and resilient means operatively connected to said locking lever, said resilient means being adapted to initially urge said locking lever into contact with said post and then into said slot means into contact with said cam means when said headrest means is pivoted upwardly through a predetermined angle relative to said post means, thereby locking said headrest means against reverse rotation to said horizontally oriented reclined attitude until said headrest means is pivoted forwardly a predetermined amount into a greater angular relationship with said post to contact and pivot said cam means so as to cause said cam means to snap overcenter in a rearward direction into said slot means under the force of said overcenter spring means and move said locking lever out of said slot means to permit said headrest means to be lowered toward said horizontally oriented reclined attitude until said projection means on said locking lever contacts said cam means and causes said cam means to snap overcenter in the other direction under the force of said overcenter spring means into position for the next sequence.

Claim 3

For use with the backrest of a vehicle seat, an angularly adjustable head restraint assembly comprising a post carried by and mounted interiorly of the backrest and projecting exteriorly therefrom at the upper end with front and rear surfaces formed thereon, an open-ended slot formed in said upper end perpendicular to the plane of said backrest, a base bracket including upper and lower connector receiving means and an abutment surface, a padded headrest support bracket secured to said base bracket, a cam member having a cam surface, a spring-end receiving portion and an unlocking tab formed thereon, first pivotal connector means for pivotally interconnecting the upper end of said post, said lower connector receiving means, and said cam member so that said cam surface is aligned with and free to be moved into said slot, overcenter spring means operatively connected between said first pivotal connector means and said spring-end receiving portion of said cam member, a locking lever including a downwardly extending stem portion and an upper projection extending forwardly into said slot, a spring support surface formed adjacent said upper projection, second pivotal connector means for pivotally interconnecting the upper end of said locking lever and said upper connector receiving means of said base bracket, and second spring means formed so as to have the ends thereof extended behind said stem and behind said base bracket, respectively, and an intermediate portion in front of said spring support surface of said locking lever for initially urging said stem of said locking lever into contact with said rear surface of said post, and then into said slot in said post into contact with said cam surface when said support and base brackets are pivoted upwardly through a predetermined angle about said first pivotal connector means, thereby locking said head restraint assembly against reverse rotation toward the reclined position until said head restraint is pivoted forwardly a predetermined amount, raising and rotating said cam surface and causing said cam member to snap overcenter in one direction to thereby move said stem of said locking lever out of said slot to thereafter ride down the rear surface of the post when said support and base brackets are lowered rearwardly until said upper projection on said locking lever engages said cam surface, causing said cam member to snap back overcenter in the other direction into position for the next sequence.

Claim 4

For use with the backrest of a vehicle seat, an angularly adjustable head restraint assembly comprising a post carried by and mounted interiorly of the backrest and projecting exteriorly therefrom at the upper end with front and rear surfaces formed thereon, an open-ended slot formed in said upper end perpendicular to the plane of said backrest, a base bracket including upper and lower connector receiving means and an abutment surface, a padded headrest support bracket secured to said base bracket, a cam member having a cam surface, a spring-end receiving portion and an unlocking tab formed thereon, first pivotal connector means for pivotally interconnecting the upper end of said post, said lower connector receiving means, and said cam member so that said cam surface is aligned with and free to be moved into said slot, overcenter spring means operatively connected between said first pivotal connector means and said spring-end receiving portion of said cam member, a locking lever including a downwardly extending stem portion and an upper projection extending forwardly into said slot, a spring support surface formed adjacent said upper projection, second pivotal connector means for pivotally interconnecting the upper end of said locking lever and said upper connector receiving means of said base bracket, and second spring means formed so as to have the ends thereof extended behind said stem and behind said base bracket, respectively, and an intermediate portion in front of said spring support surface of said locking lever for initially urging said stem of said locking lever into contact with said rear surface of said post, and then into said slot in said post into contact with said cam surface when said support and base brackets are pivoted upwardly through a predetermined angle about said first pivotal connector means, thereby locking said head restraint assembly against reverse rotation toward the reclined position until said head restraint is pivoted forwardly a predetermined amount, raising and rotating said cam surface and causing said cam member to snap overcenter in one direction to thereby move said stem of said locking lever out of said slot to thereafter ride down the rear surface of the post when said support and base brackets are lowered rearwardly until said upper projection on said locking lever engages said cam surface, causing said cam member to snap back overcenter in the other direction into position for the next sequence.