Seat
First Claim
Patent Images
1. A seat comprising:
- a seat cushion; and
a seat back including a seat back frame mounted on the seat cushion a backrest mounted on the seat back frame, and a flexible portion formed on the backrest,wherein the backrest is substantially net-shaped, and the backrest is provided in a tensioned state on the seat back frame, such that a horizontal tension in the backrest is minimized at a portion corresponding to a horizontal line set through upper rear iliac spines of a seated position of the user and increased gradually from a portion of the minimized tension, or such that a horizontal looseness is maximized at the portion corresponding to a horizontal line set through the upper rear iliac spines of the seated position and decreased gradually from a portion of the maximized looseness,wherein when a user is sitting on the seat, individual centers of a load situated at a plurality of regions, the regions presumed on left and right sides of a backrest surface symmetrically about a vertical central line of the seat back, are distributed outside a backrest area corresponding to a back region of the user, the backrest area defined by a straight line joining lower ends of left and right blade bones of the user, by a straight line joining upper ends of left and right iliac bones and by straight lines set above and along right and left lumbar iliocostal muscles.
2 Assignments
0 Petitions
Accused Products
Abstract
A seat provides a band-like support for the body sides of a user so as to reduce the supporting pressure on the user'"'"'s lumbar and to hold the user'"'"'s upper body stably. In this seat, the center of a load to be received in regions symmetrically divided to a vertical central line of the seat are positioned outside of a back region defined by left and right angulus inferior scapulae and by the upper ends of iliac bones. Moreover, the load ratios in the individual regions are not more than 25% in the region corresponding to a region extended downward from the back region.
33 Citations
25 Claims
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1. A seat comprising:
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a seat cushion; and a seat back including a seat back frame mounted on the seat cushion a backrest mounted on the seat back frame, and a flexible portion formed on the backrest, wherein the backrest is substantially net-shaped, and the backrest is provided in a tensioned state on the seat back frame, such that a horizontal tension in the backrest is minimized at a portion corresponding to a horizontal line set through upper rear iliac spines of a seated position of the user and increased gradually from a portion of the minimized tension, or such that a horizontal looseness is maximized at the portion corresponding to a horizontal line set through the upper rear iliac spines of the seated position and decreased gradually from a portion of the maximized looseness, wherein when a user is sitting on the seat, individual centers of a load situated at a plurality of regions, the regions presumed on left and right sides of a backrest surface symmetrically about a vertical central line of the seat back, are distributed outside a backrest area corresponding to a back region of the user, the backrest area defined by a straight line joining lower ends of left and right blade bones of the user, by a straight line joining upper ends of left and right iliac bones and by straight lines set above and along right and left lumbar iliocostal muscles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A seat comprising:
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a seat cushion; and a seat back including a seat back frame mounted on the seat cushion a substantially net-shaped backrest provided in a tensioned state on the seat back frame, and a flexible portion formed on the backrest, wherein the backrest is provided in a tensioned state on the seat back frame such that a horizontal tension in the backrest is minimized at a portion corresponding to a horizontal line set through upper rear iliac spines of a seated position of a user and increased gradually from a portion of the minimized tension, or such that a horizontal looseness of the backrest is maximized at the portion corresponding to the horizontal line set through the upper rear iliac spines of the seated position of the user and decreased gradually from a portion of the maximized looseness, in order to support another portion of the seat facing an area from the said user'"'"'s buttocks to said user'"'"'s lumbar to be subjected to the heavy load of a seat occupant with a device, said device arranged to integrate said backrest and said seat cushion, said device further arranged in a substantially concave manner relative to the seat occupant, such that said device functions in a direction to float said another portion. - View Dependent Claims (14, 15)
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16. A method for making a seat for a specific user, said method composing:
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measuring the specific user to determine the dimensions of a backrest area, said backrest area defined by a straight line joining lower ends of left and right blade bones of the user, by a straight line joining upper ends of left and right iliac bones of the user, and by straight lines set above and along right and left lumbar iliocostal muscles of the user, providing a seat having a seat cushion, a seat back including a seat back frame mounted on the seat cushion, a backrest mounted on the seat back frame, and a flexible portion formed on the backrest, wherein the backrest is substantially net-shaped, and the backrest is provided in a tensioned state on the seat back frame, such that a horizontal tension in the backrest is minimized at a portion corresponding to a horizontal line set through upper rear iliac spines of a seated position of the user and increased gradually from a portion of the minimized tension, or such that a horizontal looseness is maximized at the portion corresponding to a horizontal line set through the upper rear iliac spines of the seated position and decreased gradually from a portion of the maximized looseness, and wherein said seat cushion, seatback, and backrest are configured such that when the user is sitting on the seat, individual centers of a load situated at a plurality of regions, the regions presumed on left and right sides of a backrest surface symmetrically about a vertical central line of the seat back, are distributed outside the backrest area. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification