Head rest adjusting device

A device for forwardly and rearwardly adjusting the position of a headrest of a seat relative to the backrest of the seat comprising:

• a base member,
• means for supporting said base member in a plurality or vertical positions on said seat,
• a frame member covered by an outer cover for receiving and protecting a person's head,
• linkage means, pivotably connected to said base member and said frame member at fixed positions, for providing forward and rearward movement of said frame member relative to said base member along a substantially horizontal path, said linkage means including a first and a second link, each link being pivotably connected at its opposite ends about parallel axes to said base and frame members, said first link canting outwardly from said base member to said frame member in one direction and said second link canting outwardly from said base member to said frame in an opposite direction, and
• means for imparting the forward and rearward movement of said frame member relative to said base member along said substantially horizontal path for locking said frame member at selected positions relative to said base member.

A device for forwardly and rearwardly adjusting the position of a headrest of a seat relative to the backrest of the seat comprising:

• a base member,
• means for supporting said base member in a plurality of vertical positions on said seat,
• a frame member covered by an outer cover for receiving and protecting a person's head,
• linkage means, pivotably connected to said base member and said frame member at fixed positions, for providing forward and rearward movement of said frame member relative to said base member along a substantially horizontal path, and
• means for imparting the forward and rearward movement of said frame member relative to said base member along said substantially horizontal path and for locking said frame member at selected positions relative to said base member, said imparting and locking means including:
• a shaft rotatably connected to said frame member and extending through said outer cover,
• a cam member fixed to said shaft and having a cut out portion in its outer periphery,
• a pinion member, rotatably connected to said shaft, said pinion member having a tooth positioned within said cut out portion of said cam member and engageable with said cam member and further including a pinion gear, and
• a sector gear fixed on said base member and engaged with said pinion gear, whereby the rotation of said shaft and said cam member causes the pinion gear to move along the sector gear, thereby moving the frame member relative to the base member.

A device for forwardly and rearwardly adjusting the position of a headrest of a seat relative to the backrest of the seat comprising:

• a base member supported on said backrest,
• a frame member covered by an outer cover for receiving and protecting a person's head,
• linkage means, pivotably connected to said base member and said frame member at fixed positions, for providing forward and rearward movement of said frame member relative to said base member along a substantially horizontal path, and
• means for locking said frame member at selected positions relative to said base member, said means including:
• a shaft rotatably connected to said frame member and extending through said outer cover,
• a cam member fixed to said shaft and having a cut out portion in its outer periphery,
• a pinion member, rotatably connected to said shaft, said pinion member having a tooth positioned within said cut out portion of said cam member and engageable with said cam member and further including a pinion gear, and
• a sector gear fixed on said base member and engaged with said pinion gear, whereby the rotation of said shaft and said cam member causes the pinion gear to move along the sector gear, thereby moving the frame relative to the base member.