Abstract: A seat structure capable of dealing with both a normal posture and a resting posture and providing sufficient relaxation in the resting posture while ensuring excellent comfortableness of an occupant. According to the present invention, a back frame 20 itself is fixed to a frame support 10 but a cushion frame 30 shifts from a first position A to a second position B according to an occupant's movement and an inclination angle of a pelvis support 31 increases accordingly. The occupant's pelvis portion and a portion lower than the pelvis portion is moved forward but a part of his or her back above his or her breast is not varied. With this structure, the same effect of the resting posture, that is, the posture in which the back frame is reclined in a conventional seat structure, can be obtained. Since the back is not tilted backward, a leg room (footrest) space in a rear seat is not limited.

Abstract: A seat cushion of a vehicle seat has a base seat whose front end is anchored to a front frame of a frame for a sitting portion, and whose rear end is connected to a rear frame of the frame for a sitting portion via helical tension springs. A supporter, supported via helical tension springs at a pair of left and right side frames of the frame for a sitting portion, is disposed at a lower side of the base seat so as to support a femoral region of a seated person. The supporter and the helical tension springs structure an auxiliary vibration system whose mass element is a femoral region of a seated person. The auxiliary vibration system is made to function as a dynamic vibration absorber with respect to up-down vibrations of a main vibration system whose mass element is an upper body of a seated person.

Abstract: A seat structure capable of dealing with both a normal posture and a resting posture and providing sufficient relaxation in the resting posture while ensuring excellent comfortableness of an occupant. According to the present invention, a back frame 20 itself is fixed to a frame support 10 but a cushion frame 30 shifts from a first position A to a second position B according to an occupant's movement and an inclination angle of a pelvis support 31 increases accordingly. The occupant's pelvis portion and a portion lower than the pelvis portion is moved forward but a part of his or her back above his or her breast is not varied. With this structure, the same effect of the resting posture, that is, the posture in which the back frame is reclined in a conventional seat structure, can be obtained. Since the back is not tilted backward, a leg room (footrest) space in a rear seat is not limited.

Abstract: At a vehicle seat 10, a cushion material 18 is provided at a frame 14 for a sitting portion of a seat frame 12, such that a seat cushion 20 is formed. An upper cushion member (three-dimensional solid knit fabric) 86, which is a surface layer portion of the cushion material 18, is stretched at the frame 14 for the sitting portion, and is layered on a cloth spring material 18 which is a lower layer portion of the cushion material 18. When the cloth spring material 68 is pressed and flexes downward due to pushing-against force which is based on body weight of a seated person at a time of sitting on the seat cushion 20, at regions of the cloth spring material 68 which are pushed by ischial tuberosities of the seated person, tensile forces of extension coil springs 80, which are forces in the pushing direction, act, and directions of tension of the cushion material 18 are in three dimensions.

Abstract: A flat spring member (40) mainly serving as a vibration absorptive function at a normal use is engaged with a supporting frame member (130) which displaces backward along with deformation of a seat back (20) by backward moment applied to the seat back (20), and the other end is engaged with a front edge frame (102) disposed in the vicinity of the front edge of a cushion frame. Therefore, when an impact force from front or back equal to or more than that prescribed is applied, the flat spring member (40) increases in tension by backward moment applied to the seat back (20), and serves as a function to increase again the intensity of the backward moment of the seat back (20), which was once lowered by deformation of the side frame (101) of the cushion frame.

Abstract: A seat cushion of a vehicle seat has a base seat whose front end is anchored to a front frame of a frame for a sitting portion, and whose rear end is connected to a rear frame of the frame for a sitting portion via helical tension springs. A supporter, supported via helical tension springs at a pair of left and right side frames of the frame for a sitting portion, is disposed at a lower side of the base seat so as to support a femoral region of a seated person. The supporter and the helical tension springs structure an auxiliary vibration system whose mass element is a femoral region of a seated person. The auxiliary vibration system is made to function as a dynamic vibration absorber with respect to up-down vibrations of a main vibration system whose mass element is an upper body of a seated person.

Abstract: This present invention discloses a seat, comprising: a seat cushion; and a seat back frame connected to the seat cushion, the seat back frames being bent in a range of specified bending angle in a direction of moving the top end backward by a backward load over a predetermined value, by way of a joint provided at an intermediate portion in the vertical direction, such that the seat back frame receives a reaction force corresponding to the bending angle.

Abstract: A seat structure includes a torsion bar 40 disposed along the width direction in the vicinity of the bottom end of a back frame 20, a pelvis supporting plate 50 is connected to the torsion bar 40, and a flat-type supporting member 60 for the seat back is engaged with the vicinity of the bottom end of the pelvis supporting plate 50 and strained. Slack of the flat-type supporting member 60 can be eliminated by the pelvis supporting plate 50 to enhance the appearance. Further, a vibration inputted from the seat back side, and vibrates as if patting on the back of the human body can be absorbed by an elastic force of the torsion bar 40.

Abstract: A plurality of trim retainers 6, 50 are joined at opposite ends thereof to a seat back frame 4a. A first tension member 16 is connected at one end thereof to an outer edge of a body-contact portion of a cushioning material 8 and to an outer edge of a trim material 14. A second tension member 20 is connected at one end thereof to a portion of the body-contact portion of the cushioning material 8 and to an inner edge of the trim material 14. The plurality of trim retainers include a first trim retainer 50 for retaining the other end of the first tension member 16 and a second trim retainer 6 having a retaining portion for retaining the other end of the second tension member 20, with the retaining portion of the second trim retainer extending generally parallel to a cylindrical frame 4a.

Abstract: At a vehicle seat 10, a cushion material 18 is provided at a frame 14 for a sitting portion of a seat frame 12, such that a seat cushion 20 is formed. An upper cushion member (three-dimensional solid knit fabric) 86, which is a surface layer portion of the cushion material 18, is stretched at the frame 14 for the sitting portion, and is layered on a cloth spring material 18 which is a lower layer portion of the cushion material 18. When the cloth spring material 68 is pressed and flexes downward due to pushing-against force which is based on body weight of a seated person at a time of sitting on the seat cushion 20, at regions of the cloth spring material 68 which are pushed by ischial tuberosities of the seated person, tensile forces of extension coil springs 80, which are forces in the pushing direction, act, and directions of tension of the cushion material 18 are in three dimensions.

Abstract: A flat spring member (40) mainly serving as a vibration absorptive function at a normal use is engaged with a supporting frame member (130) which displaces backward along with deformation of a seat back (20) by backward moment applied to the seat back (20), and the other end is engaged with a front edge frame (102) disposed in the vicinity of the front edge of a cushion frame. Therefore, when an impact force from front or back equal to or more than that prescribed is applied, the flat spring member (40) increases in tension by backward moment applied to the seat back (20), and serves as a function to increase again the intensity of the backward moment of the seat back (20), which was once lowered by deformation of the side frame (101) of the cushion frame.

Abstract: In order to improve vibration absorbency and impact absorbency, the seat structure includes a swing member provided in a manner to be able to swing at least back and forth on a rear frame member positioned around the rear of a seat cushion, a pelvis supporting member connected to the swing member at the vicinity of the lower portion of the pelvis supporting member and disposed behind the pelvis of a seated person, and coil springs as an elastic member to support the pelvis supporting member biasing in the direction pushing forwards in a normal seating state. Accordingly, vibration inputted from the seat back side and as if patting on the back of the human body can be absorbed by the pelvis supporting member supported elastically.

Abstract: This present invention discloses a seat, comprising: a seat cushion; and a seat back frame connected to the seat cushion, the seat back frames being bent in a range of specified bending angle in a direction of moving the top end backward by a backward load over a predetermined value, by way of a joint provided at an intermediate portion in the vertical direction, such that the seat back frame receives a reaction force corresponding to the bending angle.

Abstract: A plurality of trim retainers 6, 50 are joined at opposite ends thereof to a seat back frame 4a. A first tension member 16 is connected at one end thereof to an outer edge of a contact portion of a cushioning material 8 with a lumbar region of a seat occupant and to an outer edge of a trim material 14. A second tension member 20 is connected at one end thereof to a portion of the contact portion of the cushioning material 8 with the lumbar region of the seat occupant and to an inner edge of the trim material 14. The plurality of trim retainers include a first trim retainer 50 for retaining the other end of the first tension member 16 and a second trim retainer 6 having a retaining portion for retaining the other end of the second tension member 20, with the retaining portion of the second trim retainer extending generally parallel to a cylindrical frame 4a.

Abstract: In order to improve vibration absorbency and impact absorbency, the seat structure includes a swing member provided in a manner to be able to swing at least back and forth on a rear frame member positioned around the rear of a seat cushion, a pelvis supporting member connected to the swing member at the vicinity of the lower portion of the pelvis supporting member and disposed behind the pelvis of a seated person, and coil springs as an elastic member to support the pelvis supporting member biasing in the direction pushing forwards in a normal seating state. Accordingly, vibration inputted from the seat back side and as if patting on the back of the human body can be absorbed by the pelvis supporting member supported elastically.

Abstract: The object of the present invention is to suppress rebound of a human body by making a reaction force small due to a large damping ratio. A bulging portion 11 is formed at a seat cushioning member 14 which is a tension structure. This structure has a structure of changing the damping characteristics functioned by the change in strain energy and tension by deformation created by a plane wave of the tension structure in accordance with the magnitude of the excitation force of an inputted vibration.

Abstract: A seat structure includes a torsion bar 40 disposed along the width direction in the vicinity of the bottom end of a back frame 20, a pelvis supporting plate 50 is connected to the torsion bar 40, and a flat-type supporting member 60 for the seat back is engaged with the vicinity of the bottom end of the pelvis supporting plate 50 and strained. Slack of the flat-type supporting member 60 can be eliminated by the pelvis supporting plate 50 to enhance the appearance. Further, a vibration inputted from the seat back side, and vibrates as if patting on the back of the human body can be absorbed by an elastic force of the torsion bar 40.

Abstract: The object of the present invention is to suppress rebound of a human body by making a reaction force small due to a large damping ratio. A bulging portion 11 is formed at a seat cushioning member 14 which is a tension structure. This structure has a structure of changing the damping characteristics functioned by the change in strain energy and tension by deformation created by a plane wave of the tension structure in accordance with the magnitude of the excitation force of an inputted vibration.

Abstract: A cushion includes a three-dimensional net, a plurality of metallic fastening members attached to the three-dimensional net on opposite sides thereof, and two resinous frames attached to the opposite sides of the three-dimensional net, respectively. The metallic fastening members are sandwiched between the resinous frames and the opposite sides of the three-dimensional net, and the resinous frames together with the metallic fastening members are joined to the three-dimensional net by vibration welding.

Abstract: A structural unit having a net member incorporated therein capable of preventing local application of undue force to the net member, to thereby increase reliability of the net member. An end section of a net member of a three-dimensional structure is treated so as to be reduced in cushioning characteristics and increased in hardness as compared with a portion of the net member positioned inside the end section. A frame constituting a part of the structural unit is provided with an end holding member so that an insertion port of an insertion gap of the end holding member is arranged in a particular direction or posture, resulting in the end section being readily held in the holding member by merely inserting the end section in the insertion gap. The end section is entirely inserted into the insertion gap, so that application of load to the end section may be carried out in a two-dimensional manner rather than a spot-like manner.