Abstract: A seat structure includes a seat frame having two side frames and front and rear frames, a planar elastic member stretched between the front and rear frames, a three-dimensional net overlaid on the planar elastic member, two covering materials sewn to opposite side edge portions of the planar elastic member, respectively, and a first cushioning material (14) disposed on each of the two side frames and covered with one of the covering materials. The planar elastic member has upper and lower layers at a location close to the front frame with a predetermined space created between the upper and lower layers.

Abstract: The object of the present invention is to suppress rebound of a human body when receiving a large impact load accompanying a collision or the like. A back frame member 20 and a seat frame member 10 are individually formed by welding or caulking, and a link member 30 for connecting both is attached to the back frame member 20 and the seat frame member 10 by welding or caulking. Each of the frame members is provided with a cushioning member as a tension structure. Upon receipt of an impact vibration or an impact force at a predetermined magnitude or more, the tension of the cushioning member provided as the tension structure lowers to be able to exhibit high damping characteristics.

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 folding seat comprising a seat cushion having a cushioning member supported by a seat frame and a seat back having a cushioning member supported by a back frame which is pivoted forward with respect to the seat frame so that a seat comprised of the seat cushion and the seat back can be folded. The distance between each of the side frames composing the seat frame is arranged to be wider than the distance between each of the side frames composing the back frame. A front end frame of the seat frame is positioned outside an upper end frame of the back frame when the seat frame and the back frame come close together upon folding the seat. Accordingly the thickness of the whole seat can be substantially the same as the seat cushion or the seat back alone, when the seat is folded. Thus, luggage space for baggage in a vehicle can be increased when the seat is folded.

Abstract: A seat structure includes a torsion bar 12 disposed along the width direction, and an arm 13 which is connected to the torsion bar 12, enforced in the direction of falling backward at a normal state by the torsion bar 12 in the rear of a seat cushion 10, and disposed is a flat-type supporting member 15 between the supporting frame 14 supported by the arm 13 and a frame member provided in front of the seat cushion, being strained by the elastic force of the torsion bar 12. Through this structure, the spring characteristic to give an influence on comfortability and riding comfort at the time of being seated can be given by the torsion bar 12, so that the number of coil springs which have been necessary in the vicinity of the body side can be reduced or the use of the coil spring can be stopped.

Abstract: A booster of the present invention is structured to include one permanent magnet (first permanent magnet) 40 provided in an input rod 20, and the other permanent magnet (second permanent magnet) 51 forming a repulsive magnetic field between the second permanent magnet 51 and the first permanent magnet 40, and to apply a force amplified by a force received by the second permanent magnet 51 to an output rod 60 through a channel different from an output applying channel by an output applying member 30 to booster the inputted force. The booster can boost a force by applying a force to operate an inputting member without requiring such a negative pressure source or a hydraulic pressure source operated by a separate driving force different from a driving force to drive the inputting member as the conventional booster requires.

Abstract: The structure is formed by serially connecting a torsion bar and a coil spring via a arm and a supporting frame to thereby elastically support a flat-type supporting member, and by disposing a cushioning member for seat cushion provided with a spring characteristic closely analogous to a load-to-deflection characteristic (spring characteristic) of the muscle of a human body above the flat-type supporting member. Accordingly, it is possible to make a spring characteristic for working when supporting a load of a human different from a spring characteristic for working when removing vibration even with an extremely simple structure. In other words, the structure has an excellent function to make the spring constant at work when removing vibration, especially when removing a high frequency component.

Abstract: There is provided a bio-signal detector to detect a heart rate and a respiratory rate so that the determination of a kind of a seat load placed on a seat can be made. That is, whether the seat load is a human or an object is determined, and if it is the human, then the physique size is determined to be small or large (the level of the physique size is determined). Accordingly, as compared with the means based only on a weight of the seat load, the determination result is highly reliable. Besides, with the use of the bio-signal detector, the discrimination between the human and the object is ensured. Moreover, a structure additionally including a weight sensor allows the determination of the physique size in more accurate manner.

Abstract: The seat structure includes a torsion bar as an elastic supporting-mechanism for elastically supporting a cushioning member, and is provided with arms and a supporting frame pivoted by the torsion bar. Accordingly, a device for determining a load on the seat can be structured with an extremely simple structure by providing a displacement detecting mechanism to detect the amount of twist or the twist angle of the torsion bar, or a pivot angle of the arm, displaced by being seated.

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: A human condition evaluation system, of which bio-signal analysis means includes a bio-signal peak value detection means for detecting a peak value for each cycle of an original waveform of a bio-signal data, and a power value calculation means for calculating a difference between the peak value at an upper limit side and the peak value at a lower limit side for every prescribed time range using respective peak values obtained by the bio-signal peak value detection means to thereby set the difference as a power value, is structured to determine a predictive signal for falling asleep from an active state into a sleep state. Different from conventional human condition evalution based simply on a Lyapunov exponent as an indicator, a new human condition evaluation system based on a functional status of an energy generation system of the living body is provided.

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: Seat structure designed to reduce weight and improve various functions such as impact absorbency, vibration absorbency. A torsion bar arranged along a width direction, and an arm connected to the torsion bar and enforced in a direction of falling backwards in a normal state are provided in the rear of a seat cushion, and a cushioning member is arranged between a supporting frame supported by the arm and a front frame provided at the front of the seat cushion, whose front edge is vertically movable rotationally. When working a pedal or standing up, since the front edge of the front frame is forced to move in a downward direction by a leg portion, a haunch supporting portion of the cushioning member is relatively lifted upward, so that support force to lift up the haunches works.

Abstract: The objects of the present invention is to reduce a backlash at the time of locking of a seat back and to reduce clearance in the thrust direction of a worm so as to prevent generation of an abnormal noise with a simple structure suitable for mass production. Substantially cone-shaped recesses 15 and 16 are provided respectively on both end faces of the worm 4 pivotably attached on a seat cushion, and inside end faces of a pair of holders 13 and 14 to support these two end portions, and at the same time balls 17 are rotatably housed respectively in a pair of spaces formed in the recesses 15 and 16 facing each other to form a pair of bearings 11 and 12 which rotatably support the worm 4. A press means composed of a coil spring 25 and the like which presses the worm 4 to the worm wheel 5 is provided in a locking mechanism.

Abstract: It is an object of the present invention to make a damping force variable in a damping device that uses a magnetic fluid. In a damping device using a magnetic fluid as an operating oil, the present invention includes a groove portion 34a as a leakage magnetic field generating portion that is provided in one appropriate place or more of a pair of flow path forming members forming a fluid flow path 22b and that generates a strong leakage magnetic field to the fluid flow path 22b. Accordingly, the use of only a permanent magnet enables the behavior of magnetic particles in the magnetic fluid to be changed according to a relative position of a casing 20 and a movable portion 30 and enables a damping force to be variable, without using an electromagnet.

Abstract: An object of the present invention is to minimize the dependency of the vibration characteristic exhibited by the sheet-shaped supporting member supported by the metal springs on the added load. In a plurality of metal springs 41 to 44 supporting a sheet-shaped supporting member 30, a third metal spring 43 provided on the position to support the vicinity of the greater trochanter of the seated person is provided in a manner that an engagement portion with a frame member is positioned lower than the engagement portion with the sheet-shaped supporting member 30 when no load is applied. Accordingly, the feeling of something foreign created by such a third metal spring 43 can be reduced, and within a predetermined range of the added load, the third metal spring does not work functionally because respective engagement portions 43a and 43b take their positional relationship to be substantially horizontal in a static seating state, while it works functionally when the added load exceeds the above-described range.

Abstract: A net fabric to be processed into a net product capable of simplifying processing during manufacturing of a net product, leading to a reduction in manufacturing cost of the net product is disclosed. The net fabric is so constructed that the side edge portions of the net fabric, which are subjected to processing such as cutting, vibrational welding or the like, have a higher compressibility in the thickness direction than the middle portions of the net fabric. This ensures that the net fabric exhibits a better workability during the manufacturing of the net product using the net fabric in order to simplify the manufacturing process, and to lead to a reduction in manufacturing cost, even though the net fabric has a three-dimensional structure.

Abstract: A magnetic spring device and a vibration damping apparatus, which are simpler and cheaper to manufacture, are disclosed. The magnetic spring device includes a plurality of stationary magnets, which are spaced apart to define a space between them, and a magnetic movable element, which is fit in the space. The magnetic poles of the stationary magnets are opposite to each other. The movable element is moved by the magnetic force generated by the stationary magnets in a parallel direction with the magnetic field. The properly positioned stationary magnets and movable element form a magnetic spring device, which together with additional properly positioned magnets alone may be used as a vibration damping apparatus. Also, when the magnetic spring device is combined with a cushioning member such as a metal spring, rubber or the like to form a vibration damping apparatus, the total elastic constant of the vibration damping apparatus may be near zero.