一种可活动的大躺角靠背机械伸展装置

Abstract

本实用新型公开了一种可活动的大躺角靠背机械伸展装置，旨在提升沙发舒适度与功能性。该装置包含固定板、座框、腿部伸展装置及靠背组件。固定板用于附接扶手，座框可相对固定板前后移动且用于附接坐席，腿部伸展装置与座框前部耦连。靠背组件的靠背支架借助靠背连杆和曲拐件与座框枢转连接，靠背支架有附接点、第一枢转点和第二枢转点。装置在坐姿位置时，附接点高于第一、二枢转点；躺姿位置时，附接点处于二者高度之间。此特殊高度变化设计，使靠背变换位置时按特定轨迹运动，能实现大躺角，确保躺姿时靠背躺平，为身体提供有效支撑，避免不适，还扩大了靠背角度变化范围，让使用者轻松切换坐姿与躺姿，获得优质休息体验。

Claims

1. A movable large reclining angle back mechanical extension device, characterized in that, include: A fixing plate (12) is used to attach a handrail; Seat frame (1), the seat frame (1) is used to attach the seat, the seat frame (1) is movable back and forth relative to the fixing plate (12); A leg extension device (3) is coupled to the front of the seat frame (1); Backrest assembly (2), the backrest assembly (2) includes backrest bracket (21), backrest link (22) and crank (23), the backrest bracket (21) is used to attach the backrest, and the backrest bracket (21) is pivotally connected to the seat frame (1) by means of the backrest link (22) and the crank (23), so that the rear end of the backrest bracket (21) has a forward movement tendency during the transformation of the large reclining angle backrest mechanical extension device from the sitting position to the reclining position; The backrest support (21) includes an attachment point (211) attached to the backrest, a first pivot point (212) pivotally connected to the backrest link (22), and a second pivot point (213) pivotally connected to the crank (23). When the large reclining angle backrest mechanical extension device is in a sitting position, the height of the attachment point (211) is higher than the heights of the first pivot point (212) and the second pivot point (213). When the large reclining angle backrest mechanical extension device is in a reclining position, the height of the attachment point (211) is between the heights of the first pivot point (212) and the second pivot point (213).

2. The movable reclining backrest mechanical extension device according to claim 1, characterized in that, At least two attachment points (211) are provided, and the attachment points (211) are located on the same straight line.

3. A movable large reclining angle back mechanical extension device according to claim 2, characterized in that, In a seated position, the angle between the line containing the attachment point (211) and the horizontal plane is between 105° and 120°. In a lying position, the angle between the line containing the attachment point (211) and the horizontal plane is between 160° and 180°.

4. A movable large reclining angle back mechanical extension device according to claim 1, characterized in that, The seat frame (1) includes a seat frame rear extension (11), and the crank component (23) includes a third pivot point (231) pivotally connected to the second pivot point (213), a fourth pivot point (232) pivotally connected to the seat frame rear extension (11), and a fifth pivot point (233) pivotally connected to the fixed plate (12). The distance from the first pivot point (212) to the second pivot point (213) is set as X1, the distance from the third pivot point (231) to the fourth pivot point (232) is set as X2, and the distance from the fourth pivot point (232) to the fifth pivot point (233) is set as X3. Then the ratio of X1 to X2 is 0.8-1, and the ratio of X2 to X3 is 0.65-0.

85.

5. A movable large reclining angle back mechanical extension device according to claim 4, characterized in that, A rotating connecting rod (24) is also provided between the crank (23) and the fixed plate (12). The rotating connecting rod (24) is provided with a sixth pivot point (241) and a seventh pivot point (242) pivotally connected to the fixed plate (12). The distance between the sixth pivot point (241) and the seventh pivot point (242) is X4, and the ratio of X3 to X4 is 1.15-1.

35.

6. A movable large reclining angle back mechanical extension device according to claim 1, characterized in that, The leg extension device (3) includes a footrest (35) for attaching to a footstool. In a lying position, the vertical distance between the footrest (35) and the fixing plate (12) is 380mm-400mm.

7. A movable large reclining angle back mechanical extension device according to claim 1, characterized in that, In a lying position, the vertical distance between the attachment point (211) and the footrest (35) is 160mm-200mm.

8. A movable large reclining angle back mechanical extension device according to claim 6, characterized in that, The leg extension device (3) further includes a first extension part and a second extension part. The first extension part includes a first link (31) and a second link (32) pivotally connected in sequence. The second extension part includes a third link (33) and a fourth link (34) pivotally connected in sequence. The first link (31) is rotatably connected to the fourth link (34), the second link (32) is rotatably connected to the third link (33), and the foot pedal (35) is rotatably connected to the third link (33) and the fourth link (34).

9. A movable large reclining angle back mechanical extension device according to claim 1, characterized in that, The seat frame (1) and the fixed frame include a main linkage assembly and a secondary linkage assembly. The main linkage assembly includes a front swing rod (13), a rear swing rod (14), and a middle connecting rod (15). The secondary linkage assembly includes a secondary front swing rod (17), a secondary rear swing rod (18), and a secondary middle connecting rod (19).

10. The movable large reclining angle back mechanical extension device according to claim 1, characterized in that, It also includes a drive member (4), which includes a fixed part (41) and a movable part (42) that can telescopically move relative to the fixed part (41). The fixed part (41) is pivotally connected to the fixed plate (12), and the movable part (42) is pivotally connected to the seat frame (1).

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