An angle adjusting device is provided, which includes a ratchet, multiple sliders, an expansion and retraction mechanism, and a sliding groove plate. The ratchet is provided with n inner teeth; and m slider groups consisting of the multiple sliders include one base slider group and m-1 deflecting slider groups, where the outer teeth of the deflecting slider groups have an angular deflection about a central shaft of the ratchet with respect to the outer teeth of the base slider group, and the angular deflection is (Z+k / m)360 / n degrees, and 1≤ k≤m-1, and the expansion and retraction mechanism is capable of simultaneously push the multiple sliders to extend in radial directions. The outer teeth of different sliders can simultaneously abut against or be engaged with the inner teeth at different phases, thus achieving the stable securing and stepless adjusting of the ratchet position.

A method and system to provide an occupant support device includes a first inflatable tube (101), a second inflatable tube (102) disposed parallel to the first inflatable tube (101), a third inflatable tube (103) disposed at a relative angle to the first inflatable tube (101), above the first inflatable tube (101) and below the second inflatable tube (102), a fourth inflatable tube (104) disposed parallel to the third inflatable tube (103), below the first inflatable tube (101) and above the second inflatable tube (102), and an inflation device to selectively provide a low pressure and a high pressure to at least one of the first inflatable tube (101), the second inflatable tube (102), the third inflatable tube (103), and the fourth inflatable tube (104).

A frame for seat of stuffed furniture, comprising an essentially flat frame (1) to which, on the upper side, a plurality of parallel belts (5) connecting two opposite sides of the frame, and on the lower side, a plurality of belts (7) at right angle to the preceding, connecting the two other sides, being provided for elastic elements interposed among said belts, just close to the cross areas of the same, are fixed.

The frame preferably offers an essentially flat framework consisting of U-shaped metallic structural shapes (2) with the wings facing outwards, with wood-strips (4) inserted into the wings of said U-shaped metallic structural shapes (2), being the belts (5,7) fixed respectively to the upper and lower surface of the strips.

[Purpose]

To provide a seat with ventilative property, which can eliminate or minimize the possibility of its being permanently deformed and settled into an unrecoverable deformed state.

[Means for Achieving the Purpose]

In the seat with ventilative property 1, left and right three-dimensional network cushion elements 10 are provided in a forwardly-facing region of a seat cushion of the seat, in a manner independent of each other, such that the left and right three-dimensional network cushion elements are respectively situated at: one location on which a left thigh portion of a seat occupant is to be contacted; and the other location on which a right thigh portion of the seat occupant is to be contacted. This arrangement can almost completely prevent a direct application of a weight of the seat occupant to the two three-dimensional network cushion elements. Therefore, the present invention has the effect that a permanent downward settling of the seat cushion SC can be prevented, so that a short life of the seat 1 due to such permanent settling may be substantially avoided.

Dispositif de suspension (510, 510', 610, 710) pour un sommier ou une assise, comportant :

● une section supérieure (512, 612, 712) munie d'un plateau (514, 614, 714) apte à soutenir un matelas ;

● une section inférieure (520, 520', 620, 720) comprenant des moyens permettant la fixation du dispositif de suspension au sommier, ladite section inférieure étant reliée à la section supérieure par des moyens de suspension (630, 730) ;

● des moyens pour modifier la raideur du dispositif de suspension, comportant un organe mobile (540, 540', 640, 740) par rapport au dispositif de suspension de manière à pouvoir être déplacé au moins entre une première position et une deuxième position pour modifier la raideur du dispositif de suspension.

L'organe mobile (540, 540', 640, 740) est muni d'au moins un premier corps élastique qui est configuré pour se déformer élastiquement lorsque l'organe mobile est amené d'une position à l'autre.