Mechanical stretching device for movable seat unit and seat unit

A movable seat unit, comprising:

• a seating portion, a backrest, a footrest, a motor driving device, and a mechanical stretching device attached to the foot rest, wherein the mechanical stretching device further comprises:
• a linkage support, wherein the linkage support comprises a support structure configured to support the mechanical stretching device on ground and a linkage structure attachable to the seating portion of the seat unit;
• a back mechanism, wherein the back mechanism is pivotally connected to the linkage support and is configured to attach to the backrest of the seat unit;
• and
• a leg stretching structure comprising a footrest element, wherein the leg stretching structure is pivotally connected to the linkage support, and the footrest element is attached to the footrest of the seat unit, wherein:
• the mechanical stretching device is configured to implement a sequential conversion or a reverse sequential conversion of the seat unit from a sitting state to a relaxing state and to a lying state;
• in the sitting state, the footrest element is folded below the seating portion;
• in the relaxing state, the footrest element is stretched to be in front of the seating portion and inclined relatively to a horizontal direction;
• and in the lying state, an angle between the backrest and the seating portion is increased compared to the angle between the backrest and the seating portion in the relaxing state, and the footrest element extends forward and upward from a position of the footrest element in the relaxing state, such that a height of a highest point of the leg stretching structure is greater than a height of a highest point of the back mechanism;
• and
• in the lying state, an angle between an extension direction of the footrest element and the horizontal direction is in a range between 9° and 23°.

A mechanical stretching device for a movable seat unit, comprising:

• a linkage support, wherein the linkage support comprises a support structure configured to support the mechanical stretching device on ground and a linkage structure attachable to a seating portion of the seat unit;
• a back mechanism, wherein the back mechanism is pivotally connected to the linkage support and is configured to attach to a backrest of the seat unit;
• and
• a leg stretching structure comprising a footrest element, wherein the leg stretching structure is pivotally connected to the linkage support, and the footrest element is attached to a footrest of the seat unit, wherein:
• the mechanical stretching device is configured to implement a sequential conversion or a reverse sequential conversion of the seat unit from a sitting state to a relaxing state and to a lying state;
• in the sitting state, the footrest element is folded below the seating portion;
• in the relaxing state, the footrest element is stretched to be in front of the seating portion and inclined relatively to a horizontal direction;
• and in the lying state, an angle between the backrest and the seating portion is increased compared to the angle between the backrest and the seating portion in the relaxing state, and the footrest element extends forward and upward from a position of the footrest element in the relaxing state, such that a height of a highest point of the leg stretching structure is greater than a height of a highest point of the back mechanism, wherein in the lying state, a height difference between the highest point of the leg stretching structure and the highest point of the back mechanism is in a range between 200 mm and 400 mm.

A mechanical stretching device for a movable seat unit, comprising:

• a linkage support, wherein the linkage support comprises a support structure configured to support the mechanical stretching device on ground and a linkage structure attachable to a seating portion of the seat unit;
• a back mechanism, wherein the back mechanism is pivotally connected to the linkage support and is configured to attach to a backrest of the seat unit;
• and
• a leg stretching structure comprising a footrest element, wherein the leg stretching structure is pivotally connected to the linkage support, and the footrest element is attached to a footrest of the seat unit, wherein:
• the mechanical stretching device is configured to implement a sequential conversion or a reverse sequential conversion of the seat unit from a sitting state to a relaxing state and to a lying state;
• in the sitting state, the footrest element is folded below the seating portion;
• in the relaxing state, the footrest element is stretched to be in front of the seating portion and inclined relatively to a horizontal direction;
• and in the lying state, an angle between the backrest and the seating portion is increased compared to the angle between the backrest and the seating portion in the relaxing state, and the footrest element extends forward and upward from a position of the footrest element in the relaxing state, such that a height of a highest point of the leg stretching structure is greater than a height of a highest point of the back mechanism, wherein in the lying state, a height difference between the highest point of the leg stretching structure and the highest point of the back mechanism is in a range between 200 mm and 400 mm;
• and
• in the lying state, an angle between an extension direction of the footrest element and the horizontal direction is in a range between 9° and 23°.