Foldable headrest for a vehicle seat, especially for the rear seat of a passenger car

Claim 2

A foldable headrest for a rear vehicle seat, said headrest having a lateral surface, said headrest being mounted for pivoting movement on a seat backrest of said rear vehicle seat, said rear vehicle seat backrest having bushings with aligned bores and at least one of said bushing having recesses in an arc, said headrest in combination comprising: a lower headrest member mounted by pivot pins into said aligned bores of said backrest and said lower headrest member having a dead end bore parallel with said aligned bores of said backrest and said lower headrest having a lateral opening intersecting said dead end bore; a spring arranged in said dead end bore; and a latch pin adapted for axial displacement in said dead end bore, said latch pin having an actuating device extending through said lateral opening and said actuating device at a free end having a push key accessible by way of said lateral surface of said lower headrest member, and said latch pin in said dead end bore has one end facing said spring and said latch pin end facing away from said spring extends in a rest position past the lateral surface of said lower headrest member into one of said recesses in an arc whereby manually pressing against said push key allows said actuating device to be moved against the biasing of said spring to remove said latch pin out of one of said recesses so that said headrest can be pivotally stepwise adjusted into another position.

Claim 3

A vehicle seat headrest adjustable in height in a stepwise manner in relationship to a seat backrest, said headrest in combination comprising: a headrest frame; a ratchet bar with an axis, said ratchet bar being fastened to said headrest frame, said ratchet bar having a series of transverse indentions, said ratchet bar having a section with a first cross-sectional shape and a second section with a smaller second cross-sectional shape with at least one indention adjacent a transition between said first and second cross-sectional shapes and said ratchet bar having a pawl; a guide member attached with said seat backrest slidably mounting said ratchet bar for displacement of said ratchet bar therein; spring means engaged with said ratchet biasing the same generally upwardly within said guide member, a spring leaf biased for engagement with said indentions to set the position of said headrest via said ratchet bar, and said spring leaf preventing upward adjustment and allowing downward adjustment of said headrest via said ratchet bar when said spring leaf is engaged with said indentions and means controlling the positioning of said leaf spring, whereby said controlling means retains said spring leaf in a position away from engagement with said indentions when said ratchet bar is pushed downward from the position of said ratchet bar where said spring leaf is engaged with the uppermost indention of said ratchet bar and whereby said headrest via said ratchet bar can be adjusted to an extreme upward position whereby said pawl releases said spring leaf from said control means allowing said spring leaf to re-engage with said ratchet bar indentions whereupon said headrest can be adjusted downward in a stepwise manner to the height desired.

Claim 4

A vehicle seat headrest adjustable in height in a stepwise manner in relationship to a seat backrest, said headrest in combination comprising: a headrest frame; a ratchet bar with an axis, said ratchet bar being fastened to said headrest frame, said ratchet bar having a series of transverse indentions, said ratchet bar having a section with a first cross-sectional shape and a second section with a smaller second cross-sectional shape with at least one indention adjacent a transition between said first and second cross-sectional shapes and said ratchet bar having a pawl; a guide member attached with said seat backrest slidably mounting said ratchet bar for displacement of said ratchet bar therein; spring means engaged with said ratchet biasing the same generally upwardly within said guide member, a spring leaf biased for engagement with said indentions to set the position of said headrest via said ratchet bar, and said spring leaf preventing upward adjustment and allowing downward adjustment of said headrest via said ratchet bar when said spring leaf is engaged with said indentions and means controlling the positioning of said leaf spring, whereby said controlling means retains said spring leaf in a position away from engagement with said indentions when said ratchet bar is pushed downward from the position of said ratchet bar where said spring leaf is engaged with the uppermost indention of said ratchet bar and whereby said headrest via said ratchet bar can be adjusted to an extreme upward position whereby said pawl releases said spring leaf from said control means allowing said spring leaf to re-engage with said ratchet bar indentions whereupon said headrest can be adjusted downward in a stepwise manner to the height desired.

Claim 5

A headrest as described in claim 2 wherein said guide member is mounted in a lower headrest member which is in turn pivotally connected with said seat backrest.

Claim 6

A headrest as described in claim 2 wherein said ratchet bar is arcuate.

Claim 7

A vehicle headrest is described in claim 2 wherein said spring leaf has a tongue-like detent lateral portion having an outer angle sliding surface and a detent surface arranged opposite said sliding surface, said tubular guide member having a finger-like circumferentially extending detent portion arranged opposite the sliding surface of said tongue-like detent and whereby movement downward of said ratchet bar from a position of engagement of said leaf spring in the uppermost indention of said ratchet bar causes said leaf spring to be pushed outwardly by said transition between the first and second cross-sectional areas of said ratchet bar, and upon being pushed radially outward by the downward movement of said ratchet bar, said tongue-like detent is detained by a detent surface of said finger-like detent, whereby said spring leaf is laterally offset and held by said finger-like detent to remain out of engagement with said indentions on said ratchet bar and whereby movement of said ratchet bar is limited in an upward direction by said pawl engaging with said leaf spring to disengage said tongue-like detent from engagement with said finger-like detent whereby said spring leaf engages with the lowermost said indention of said ratchet bar to define the uppermost position of said headrest with respect to said seatback.

Claim 8

A vehicle seat headrest adjustable in height in a stepwise manner in relationship to a seat backrest, said headrest in combination comprising: a headrest frame; a ratchet bar with an axis, said ratchet bar being fastened to said headrest frame, and said ratchet bar having a section with a first large cross-sectional area, and a second cross-sectional area with a smaller cross-sectional area, and said ratchet bar having a series of transverse indentions including an uppermost indention in the transitional area between first and second cross-sectional areas and a lowermost indention in said second cross-sectional area, and said ratchet bar having at lower end a pawl with an angled surface; a guide member attached with said seatback rest slidably mounting said ratchet bar for axial displacement with said ratchet bar, said guide member having a slot aligning said pawl; a spring confined between the lower end of said guide member and said ratchet bar biasing said ratchet bar in a generally upward direction; a spring leaf biased for engagement with said indentions of said ratchet bar to set the position of said headrest via said ratchet bar and said spring leaf preventing upward adjustment and allowing downward adjustment of said ratchet bar when said spring leaf is engaged with one of said indentions, said spring leaf having a tongue-like laterally extending detent provided with an outer sliding surface and an opposite detent surface; a detent circumferentially arranged in a finger-like manner opposite the sliding surface of said tongue-like detent of the spring leaf, said finger-like detent providing a detent surface whereby movement of the ratchet bar down from a position of engagement of said uppermost indention with said spring leaf causes said spring leaf to be urged radially outward by said transitional area of said ratchet bar whereby said spring leaf is then laterally retained by said tongue-like detent by being engaged with said detent surface of said finger-like detent wherein said headrest can be freely adjusted into an extreme upper position whereby said pawl angled surface releases said tongue-like detent from said finger-like detent allowing said spring leaf to be engaged with said lowermost indention of said ratchet bar and whereby said headrest via said ratchet bar can be adjusted to a lower position by pushing down on said ratchet bar.

Claim 9

A vehicle seat headrest adjustable in height in a stepwise manner in relationship to a seat backrest, said headrest in combination comprising: a headrest frame; a ratchet bar with an axis, said ratchet bar being fastened to said headrest frame, and said ratchet bar having a section with a first large cross-sectional area, and a second cross-sectional area with a smaller cross-sectional area, and said ratchet bar having a series of transverse indentions including an uppermost indention in the transitional area between first and second cross-sectional areas and a lowermost indention in said second cross-sectional area, and said ratchet bar having at lower end a pawl with an angled surface; a guide member attached with said seatback rest slidably mounting said ratchet bar for axial displacement with said ratchet bar, said guide member having a slot aligning said pawl; a spring confined between the lower end of said guide member and said ratchet bar biasing said ratchet bar in a generally upward direction; a spring leaf biased for engagement with said indentions of said ratchet bar to set the position of said headrest via said ratchet bar and said spring leaf preventing upward adjustment and allowing downward adjustment of said ratchet bar when said spring leaf is engaged with one of said indentions, said spring leaf having a tongue-like laterally extending detent provided with an outer sliding surface and an opposite detent surface; a detent circumferentially arranged in a finger-like manner opposite the sliding surface of said tongue-like detent of the spring leaf, said finger-like detent providing a detent surface whereby movement of the ratchet bar down from a position of engagement of said uppermost indention with said spring leaf causes said spring leaf to be urged radially outward by said transitional area of said ratchet bar whereby said spring leaf is then laterally retained by said tongue-like detent by being engaged with said detent surface of said finger-like detent wherein said headrest can be freely adjusted into an extreme upper position whereby said pawl angled surface releases said tongue-like detent from said finger-like detent allowing said spring leaf to be engaged with said lowermost indention of said ratchet bar and whereby said headrest via said ratchet bar can be adjusted to a lower position by pushing down on said ratchet bar.