Adjusting device for seat unit and seat unit

Abstract

Provided is an adjusting device for a seat unit, configured to switch the seat unit between a sitting position, a stretching position, and a lying position. The adjusting device includes a backrest connecting assembly, an intermediate transmission assembly, and a footrest connecting assembly that are connected in sequence. The backrest connecting assembly at least includes a backrest connecting block. The intermediate transmission assembly at least includes a seat frame and an adjusting mechanism configured to adjust the seat frame. The adjusting mechanism includes a first connecting member, the first connecting member is configured with a first hinge hole, a second hinge hole, and a third hinge hole in sequence, a distance between the first hinge hole and the third hinge hole is A 1 , a distance between the second hinge hole and the third hinge hole is A 2 , and a ratio of A 2 to A 1 is not greater than 0.5.

1 . An adjusting device for a seat unit, configured to switch the seat unit between a sitting position, a stretching position, and a lying position, wherein the adjusting device comprises a backrest connecting assembly, an intermediate transmission assembly, and a footrest connecting assembly that are connected in sequence;
 the backrest connecting assembly at least comprises a backrest connecting block;   the intermediate transmission assembly at least comprises a seat frame and an adjusting mechanism configured to adjust the seat frame;   the adjusting mechanism comprises a first connecting member, the first connecting member is configured with a first hinge hole, a second hinge hole, and a third hinge hole in sequence, a distance between the first hinge hole and the third hinge hole is A 1 , a distance between the second hinge hole and the third hinge hole is A 2 , and a ratio of A 2  to A 1  is not greater than 0.5;   the adjusting mechanism further comprises a fixed base plate and a rotary driving plate disposed opposite to each other, and two seventh connecting members disposed between the seat frame and the rotary driving plate; the rotary driving plate is configured with a ninth hinge hole, a tenth hinge hole, and an eleventh hinge hole in sequence, wherein:   the eleventh hinge hole is disposed close to the footrest connecting assembly, the ninth hinge hole is disposed close to the backrest connecting assembly, and the two seventh connecting members are hinged to the tenth hinge hole and the eleventh hinge hole respectively;   the first hinge hole is coaxial with the ninth hinge hole,   a distance between the ninth hinge hole and the tenth hinge hole is C 1 , a distance between the ninth hinge hole and the eleventh hinge hole is C 2 , and a ratio of C 1  to C 2  is not greater than 0.35; and   a variation of an angle between a side edge of the backrest connecting block and the horizontal plane is not less than 25° when the backrest connecting block is adjusted between the stretching position and the lying position.   
     
     
         2 . The adjusting device for the seat unit according to  claim 1 , wherein the adjusting mechanism further comprises a second connecting member hinged to the first connecting member,
 the second connecting member is configured with a fourth hinge hole, a fifth hinge hole, and a sixth hinge hole in sequence, the fifth hinge hole is coaxial with the third hinge hole, a distance between the fourth hinge hole and the sixth hinge hole is B 1 , a distance between the fifth hinge hole and the sixth hinge hole is B 2 , and a ratio of B 2  to B 1  is not greater than 0.5.   
     
     
         3 . The adjusting device for the seat unit according to  claim 2 , wherein the adjusting mechanism further comprises a third connecting member hinged to the second connecting member, the third connecting member is configured with a seventh hinge hole and an eighth hinge hole, the seventh hinge hole is coaxial with the sixth hinge hole, and a distance between the seventh hinge hole and the eighth hinge hole is not greater than 230 mm. 
     
     
         4 . The adjusting device for the seat unit according to  claim 3 , wherein the first connecting member, the second connecting member, the third connecting member, a fourth connecting member, a fifth connecting member, and a sixth connecting member are provided between the fixed base plate and the rotary driving plate;
 the first connecting member is hinged to the rotary driving plate through the first hinge hole;   the second connecting member is hinged to the fixed base plate through the fourth hinge hole;   an end of the sixth connecting member is hinged to the second hinge hole, an opposite end of the sixth connecting member is hinged to an end of the fourth connecting member;   an opposite end of the fourth connecting member is hinged to the fixed base plate;   an end of the fifth connecting member is hinged between two ends of the fourth connecting member, an opposite end of the fifth connecting member is hinged to the rotary driving plate; and   the third connecting member is hinged between two ends of the sixth connecting member through the eighth hinge hole.   
     
     
         5 . The adjusting device for the seat unit according to  claim 2 , wherein the footrest connecting assembly comprises a footrest connecting block;
 the fixed base plate is provided with a rear mounting hole, a horizontal plane at which a center of the rear mounting hole is located is defined as a reference plane;   a height between a lowest point of the footrest connecting block and the reference plane is H 1  when the backrest connecting block is in the sitting position, with H 1  not greater than 100 mm; and   a height between a highest point of the footrest connecting block and the reference plane is H 2  when the backrest connecting block is in the lying position, with H 2  not greater than 600 mm.   
     
     
         6 . The adjusting device for the seat unit according to  claim 5 , wherein an ascending distance of the footrest connecting block is not greater than 300 mm during adjustment from the stretching position to the lying position. 
     
     
         7 . The adjusting device for the seat unit according to  claim 5 , wherein a distance between a highest point of the backrest connecting block and the reference plane is not greater than 400 mm in the sitting position, and a distance between the highest point of the backrest connecting block and the reference plane is not greater than 320 mm in the lying position. 
     
     
         8 . The adjusting device for the seat unit according to  claim 7 , wherein the backrest connecting assembly further comprises a backrest limit block, a backrest limit rod, and a ninth connecting member, the backrest connecting block is hinged to the backrest limit block, an end of the ninth connecting member is hinged between two ends of the backrest connecting block, an opposite end of the ninth connecting member is hinged to the backrest limit rod, the backrest limit rod is provided with a limit protrusion, the backrest limit block is provided with a limit surface matching the limit protrusion, and a descending distance of a center of the ninth connecting member is in a range of 30 to 100 mm during adjustment from the stretching position to the lying position. 
     
     
         9 . The adjusting device for the seat unit according to  claim 8 , wherein an elastic cushioning device is provided between the backrest limit block and the backrest limit rod. 
     
     
         10 . The adjusting device for the seat unit according to  claim 9 , wherein the elastic cushioning device is a sponge mad and/or a spring. 
     
     
         11 . The adjusting device for the seat unit according to  claim 1 , wherein a variation of an angle between a side edge of the seat frame and the horizontal plane not less than 5° when the seat frame is adjusted between the stretching position and the lying position. 
     
     
         12 . The adjusting device for the seat unit according to  claim 1 , wherein a first adjustment stage refers to the seat unit being adjusted from the sitting position to the stretching position, a second adjustment stage refers to the seat unit being adjusted from the stretching position to the lying position, and both the first adjustment stage and the second adjustment stage are driven by a same drive source. 
     
     
         13 . The adjusting device for the seat unit according to  claim 12 , wherein the drive source is connected to the backrest connecting assembly or the intermediate transmission assembly, and an output end of the drive source is connected to the footrest connecting assembly. 
     
     
         14 . The adjusting device for the seat unit according to  claim 12 , wherein the drive source is a linear motor, the linear motor is provided with an output shaft, and the output shaft is connected to the footrest connecting assembly. 
     
     
         15 . The adjusting device for the seat unit according to  claim 13 , wherein the drive source is a linear motor, the linear motor is provided with an output shaft, and the output shaft is connected to the footrest connecting assembly. 
     
     
         16 . The adjusting device for the seat unit according to  claim 12 , wherein the drive source is a cylinder, the cylinder is provided with a piston rod, and the piston rod is connected to the footrest connecting assembly. 
     
     
         17 . The adjusting device for the seat unit according to  claim 13 , wherein the drive source is a cylinder, the cylinder is provided with a piston rod, and the piston rod is connected to the footrest connecting assembly. 
     
     
         18 . The adjusting device for the seat unit according to  claim 1 , wherein the first connecting member comprises an extension segment a, an extension segment b, and a first transition segment c that are connected in sequence, the extension segment a is parallel to the extension segment b, both the second hinge hole and the third hinge hole are provided on the extension segment a, and the first hinge hole is provided on the extension segment b. 
     
     
         19 . The adjusting device for the seat unit according to  claim 2 , wherein the second connecting member comprises an extension segment d, an extension segment e, and a second transition segment f that are connected in sequence, the extension segment d is parallel to the extension segment e, both the fifth hinge hole and the sixth hinge hole are provided on the extension segment d, and the fourth hinge hole is provided on the extension segment e. 
     
     
         20 . A seat unit, comprising a backrest part, a seat part, a footrest part, and an adjusting device for the seat unit, wherein:
 the adjusting device for a seat unit, configured to switch the seat unit between a sitting position, a stretching position, and a lying position, wherein the adjusting device comprises a backrest connecting assembly, an intermediate transmission assembly, and a footrest connecting assembly that are connected in sequence;   the backrest connecting assembly at least comprises a backrest connecting block;   the intermediate transmission assembly at least comprises a seat frame and an adjusting mechanism configured to adjust the seat frame; the adjusting mechanism comprises a first connecting member, the first connecting member is configured with a first hinge hole, a second hinge hole, and a third hinge hole in sequence, a distance between the first hinge hole and the third hinge hole is A 1 , a distance between the second hinge hole and the third hinge hole is A 2 , and a ratio of A 2  to A 1  is not greater than 0.5;   the adjusting mechanism further comprises a fixed base plate and a rotary driving plate disposed opposite to each other, and two seventh connecting members disposed between the seat frame and the rotary driving plate; the rotary driving plate is configured with a ninth hinge hole, a tenth hinge hole, and an eleventh hinge hole in sequence, wherein:   the eleventh hinge hole is disposed close to the footrest connecting assembly, the ninth hinge hole is disposed close to the backrest connecting assembly, and the two seventh connecting members are hinged to the tenth hinge hole and the eleventh hinge hole respectively;   the first hinge hole is coaxial with the ninth hinge hole,   a distance between the ninth hinge hole and the tenth hinge hole is C 1 , a distance between the ninth hinge hole and the eleventh hinge hole is C 2 , and a ratio of C 1  to C 2  is not greater than 0.35;   a variation of an angle between a side edge of the backrest connecting block and the horizontal plane is not less than 25° when the backrest connecting block is adjusted between the stretching position and the lying position;   the backrest connecting block is configured to be connected with the backrest part;   the seat frame is configured to be connected with the seat part; and   a height difference between a highest point of the footrest part and the backrest part is not greater than 400 mm when in the lying position.