Seat with back support

Claim 2

A vehicle seat which has a seat portion and a seat back, the seat back including a seat back frame and a back rest, the back rest being borne on a back rest frame, the back rest including: supports respectively for the lumbar and shoulder regions of a person seated on the seat portion, the supports being both mounted on the back rest frame, the seat back frame having an elongate guide means, the back rest frame having a pivot, the pivot engaged in the elongate guide means, the pivot being movable in rotation about its axis and being movable in translation along the elongate guide means, separate adjustment means respectively determining the relative angular position of the frames about the axis of the pivot and the position of the pivot along the elongate guide, and independently operable controls respectively for the separate adjustment means being both accessible to a person while seated on the seat portiOn in an operational attitude.

Claim 3

A seat according to claim 1 wherein the means for determining the relative angular position of the frames is a lever arm mounted for rotation about an axis fixed in relation to the seat back frame and slidably received by the back rest frame.

Claim 4

A seat according to claim 1 wherein the said controls are rotatable knobs arranged to rotate about a single axis and positioned one on each side of the seat.

Claim 5

A seat according to claim 3 wherein the seat back is movable relative to the seat portion about a pivot axis, and the controls are both brought in co-axially with the pivot axis of the seat back.

Claim 6

A vehicle seat having a seat portion and a seat back, the seat back including a rigid seat back frame and a rigid back rest frame, the back rest frame having a lower end and an upper end, means for pivotally mounting the seat back frame to the seat portion whereby said seat back frame may be angularly adjusted relative to the seat portion, a movable mounting at the upper end of the back rest frame, the movable mounting bearing the back rest frame in the seat back frame, the back rest frame bearing a support for at least the lumbar region of a person sitting on the seat portion, the movable mounting being adapted to permit continuous movement of the back rest frame relative to the seat back frame in directions towards and away from the pivotal mounting and to permit angular movement of the back rest frame such that the support on the rigid back frame is displaced towards and away from the seat back frame, control means separately driving the said movements being each brought out to a position at a lateral side of the chair accessible to a person while seated on the seat portion in an operational attitude.

Claim 7

A vehicle seat having a seat portion and a seat back, the seat back including a rigid seat back frame and a rigid back rest frame, the back rest frame having a lower end and an upper end, means for pivotally mounting the seat back frame to the seat portion whereby said seat back frame may be angularly adjusted relative to the seat portion, a movable mounting at the upper end of the back rest frame, the movable mounting bearing the back rest frame in the seat back frame, the back rest frame bearing a support for at least the lumbar region of a person sitting on the seat portion, the movable mounting being adapted to permit continuous movement of the back rest frame relative to the seat back frame in directions towards and away from the pivotal mounting and to permit angular movement of the back rest frame such that the support on the rigid back frame is displaced towards and away from the seat back frame, control means separately driving the said movements being each brought out to a position at a lateral side of the chair accessible to a person while seated on the seat portion in an operational attitude.

Claim 8

A seat according to claim 5 wherein the back rest includes also a support for the shoulder region of a person sitting on the seat portion, the lumbar support and shoulder supports being mounted on the back rest frame for movement together.

Claim 9

A seat according to claim 6 wherein the lumbar support and shoulder support are separate upholstered pads mounted on the back rest frame.

Claim 10

A vehicle seat which has a seat portion and a seat back, the seat back having a seat back frame and a back rest frame, the seat back having supports respectively for the lumbar and shoulder regions of a person sitting on the seat portion, the said supports both being borne on the back rest frame, means for pivotally mounting the seat back frame to the seat portion whereby said seat back frame may be angularly adjusted relative to the seat portion, the back rest frame being pivotally engaged to the seat back frame by pivotal engagement between pivot means and an elongate guide member, means determining the position of the pivotal engagement of the back rest frame with the seat back frame along the elongate guide, means determining the angular relationship of the back rest frame with the seat back frame about the axis of the pivotal engagement, and respective and independent controls for driving the said determining means being each brought out to a lateral side of the chair to be accessible to a person while seated on the seat portion in an operational attitude.

Claim 11

A vehicle seat which has a seat portion and a seat back, the seat back having a seat back frame and a back rest frame, the seat back having supports respectively for the lumbar and shoulder regions of a person sitting on the seat portion, the said supports both being borne on the back rest frame, means for pivotally mounting the seat back frame to the seat portion whereby said seat back frame may be angularly adjusted relative to the seat portion, the back rest frame being pivotally engaged to the seat back frame by pivotal engagement between pivot means and an elongate guide member, means determining the position of the pivotal engagement of the back rest frame with the seat back frame along the elongate guide, means determining the angular relationship of the back rest frame with the seat back frame about the axis of the pivotal engagement, and respective and independent controls for driving the said determining means being each brought out to a lateral side of the chair to be accessible to a person while seated on the seat portion in an operational attitude.

Claim 12

A seat according to claim 8 wherein the said controls are rotatable knobs arranged to rotate about a single axis and positioned on each lateral side of the seat, and the controls are both brought in co-axially with an axis about which said seat back is pivotally mounted.