초록 ▼

A seat adjustment mechanism, which adjusts an angle formed between first and second seat members rotatably connected to each other, includes a first link member adapted to be connected to the first seat member and including a first end rotatably supported by the first seat member, a second link memb

A seat adjustment mechanism, which adjusts an angle formed between first and second seat members rotatably connected to each other, includes a first link member adapted to be connected to the first seat member and including a first end rotatably supported by the first seat member, a second link member adapted to be rotatably connected to the second seat member and including a first end rotatably supported by the second seat member and a second end rotatably connected to the first link member, a drive device, and an extending and retracting device driven by the drive device and extending and retracting linearly, wherein one of the drive device and the extending and retracting device is rotatably connected to a second end of the first link member and the other of the drive device and the extending and retracting device is rotatably connected to the second seat member.

대표청구항 ▼

1. A seat adjustment mechanism, adjusting an angle formed between first and second seat members rotatably connected to each other, comprising: a first link member adapted to be connected to the first seat member and including a first end rotatably supported by the first seat member;a second link mem

1. A seat adjustment mechanism, adjusting an angle formed between first and second seat members rotatably connected to each other, comprising: a first link member adapted to be connected to the first seat member and including a first end rotatably supported by the first seat member;a second link member adapted to be rotatably connected to the second seat member and including a first end rotatably supported by the second seat member and a second end rotatably connected to the first link member;a drive device; andan extending and retracting device driven by the drive device and extending and retracting linearly,wherein one of the drive device and the extending and retracting device is rotatably connected to a second end of the first link member and the other of the drive device and the extending and retracting device is rotatably connected to the second seat member,wherein assuming thata connecting point between the first link member and the second link member is defined as a connecting point P,a connecting point between the first seat member and the first link member is defined as a connecting point Q,a connecting point between the second seat member and the second link member is defined as a connecting point R,a connecting point between the first link member and one of the drive device and the extending and retracting device is defined as a connecting point S,a connecting point between the second seat member and the other of the drive device and the extending and retracting device is defined as a connecting point T,a line linearly passing through the connecting points Q and R is defined as a line L1, anda line linearly passing through the connecting points S and T is defined as a line L2,the first and second link members, the first link member and one of the drive device and the extending and retracting device, and the second link and the other of the drive device and the extending and retracting device are connected to each other so that a ratio a/b of a distance “a” from the connecting point P to the line L1 relative to a distance “b” from the connecting point P to the line L2 is set to be less than one, andwherein the drive device is driven to move the extending and retracting device linearly to rotate the first link member relative to the second link member to thereby generate a relative rotation between the first seat member and the second seat member in order to adjust the angle between the first and second seat members. 2. The seat adjustment mechanism according to claim 1, wherein the first link member is formed into a disc shape and provided with a rotation center point serving as the connecting point P with the second link member, the first link member further including the connecting point Q and the connecting point R, and the second link member is formed into an arm shape and provided with the first end serving as the connecting point R with the second seat member and the second end to which the first link member is rotatably connected. 3. The seat adjustment mechanism according to claim 1, wherein the connecting point Q and the connecting point S are adapted to be fixed respectively at rear and front portions of the first seat member in an inner side thereof, and the first seat member is connected to the second seat member and driven to be tiltable forward relative to the second seat member. 4. A seat apparatus for a vehicle, including a seat cushion and a seat back having first and second seat members rotatably connected to each other, comprising: a side frame mechanism serving as one of the first and second seat members, a lower end of which is tiltably connected to a rear end of a seat cushion frame arranged within the seat cushion;an upper cross-member serving as the other of the first and second seat members arranged at an upper portion of the side frame mechanism; anda seat adjustment mechanism adjusting an angle formed between the side frame mechanism and the upper cross-member rotatably connected to each other and including: a first link member adapted to be connected to the first seat member and including a first end rotatably supported by the first seat member;a second link member adapted to be rotatably connected to the second seat member and including a first end rotatably supported by the second seat member and a second end rotatably connected to the first link member;a drive device; andan extending and retracting device driven by the drive device and extending and retracting linearly,wherein one of the drive device and the extending and retracting device is rotatably connected to a second end of the first link member and the other of the drive device and the extending and retracting device is rotatably connected to the second seat member,wherein assuming thata connecting point between the first link member and the second link member is defined as a connecting point P,a connecting point between the first seat member and the first link member is defined as a connecting point Q,a connecting point between the second seat member and the second link member is defined as a connecting point R,a connecting point between the first link member and one of the drive device and the extending and retracting device is defined as a connecting point S,a connecting point between the second seat member and the other of the drive device and the extending and retracting device is defined as a connecting point T,a line linearly passing through the connecting points Q and R is defined as a line L1, anda line linearly passing through the connecting points S and T is defined as a line L2,the first and second link members, the first link member and one of the drive device and the extending and retracting device, and the second link member and the other of the drive device and the extending and retracting device are connected to each other so that a ratio a/b of a distance “a” from the connecting point P to the line L1 relative to a distance “b” from the connecting point P to the line L2 is set to be less than one, wherein the drive device is driven to linearly move the extending and retracting device to rotate the first link member relative to the second link member to thereby generate a relative rotation between the first seat member and the second seat member in order to adjust the angle between the first and second seat members, andwherein the connecting point Q and the connecting point S are adapted to be fixed respectively at rear and front portions of the side frame mechanism in an inner side thereof and the upper cross-member is connected to the side frame mechanism and driven to be tiltable forward relative to the side frame mechanism. 5. The seat apparatus according to claim 4, wherein the first link member is formed into a disc shape and provided with a rotation center point serving as the connecting point P with the second link member, the first link member further including the connecting point Q and the connecting point R, and the second link member is formed into an arm shape and provided with the first end serving as the connecting point R with the second seat member and the second end to which the first link member is rotatably connected. 6. The seat apparatus according to claim 5, wherein the first and second link members and the extending and retracting device are arranged between the side frame mechanism and the upper cross-member provided at each of both sides of the seat back in a width direction of the vehicle, and wherein the drive device is arranged at an intermediate portion of a side frame connecting member connecting between side frame body portions of the side frame mechanisms arranged at the both sides of the seat back, the drive device simultaneously driving the extending and retracting devices arranged at the both sides of the seat back. 7. The seat apparatus according to claim 6, wherein flexible cables transmitting a driving force of the drive device to the extending and retracting devices are arranged between the drive device and the respective extending and retracting devices. 8. The seat apparatus according to claim 4, wherein the first and second link members and the extending and retracting device are arranged between the side frame mechanism and the upper cross-member provided at each of both sides of the seat back in a width direction of the vehicle, and wherein the drive device is arranged at an intermediate portion of a side frame connecting member connecting between side frame body portions of the side frame mechanisms arranged at the both sides of the seat back, the drive device simultaneously driving the extending and retracting devices arranged at the both sides of the seat back. 9. The seat apparatus according to claim 8, wherein flexible cables transmitting a driving force of the drive device to the extending and retracting devices are arranged between the drive device and the respective extending and retracting devices.