Motive Air Seat Cushion

This invention relates to the seat cushions, and more particularly to a motive air seat cushion that provides a cooling/warming sensation for a person to sit on.

The present invention is an improvement on the invention covered by U.S. Pat. No. 4,853,992 to Kaung M. Yu.

As illustrated in U.S. Pat. No. 4,853,992 an air cooled/heated seat cushion comprised an envelope embedded with support padding, a partitioning wall having holes located inside one edge of the envelope to form a distribution channel, an air inlet opening to the channel, and an air discharge opening at the other edges of the envelope. The envelope and the distribution channel are formed as an integrated structure. Conventional seat cushions preceding that of U.S. Pat. No. 4,853,992 had very little success in providing cooling or warming sensation to an occupant due to the fact that inside the cushions either the air is almost stagnant without motive air applied, or the padding obstructs the air to pass through the envelope. The present invention departs from previous concepts by providing a seat cushion which contains an air distribution box embedded inside the cushion. An air tube is connected between the box and an air source. The motive air from the air source flows through the box and diffuses through the cushion, thus cooling or warming the person sitting on it.

The present invention utilizes to the fullest advantage of an independent air distribution box inside the envelope, and results in a seat cushion with an evenly cooling/warming sensation to a person sitting on it.

An another important advantage of the present invention is that there are no potential leakages beyond the distribution holes around the box. As illustrated in U.S. Pat. No. 4,853,992, the air channel connected to the envelope may develop leakages around the joints and results in uneven air distribution through the envelope.

Accordingly, an important object of the present invention is that the air distribution box being a separate unit which is placed inside the envelope but is not connected to the envelope. Another object of the present invention is to produce a seat cushion which is simple in construction and suitable for mass production at a low cost. Further objects and advantages of my invention will become apparent from a consideration of the drawings and ensuing descriptions thereof.

According to the present invention, a motive air seat cushion comprises an envelope consisting of top and bottom wall members. The two wall members are connected to each other around the edges. An air distribution box having a plurality of holes around the edges is located inside the envelope. An air inlet opening is connected to the box through the envelope for permitting air to enter the box. Air discharge openings are located around the edges of the envelope for air to exit. Flexible hollow supporting paddings are provided inside the box and the envelope, thus allowing air to enter the box and diffuse through the envelope.

The present invention will now be explained with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of the motive air seat cushion with a person sitting on it.

FIG. 2 is an interior view taken in the direction of the back of the seat cushion.

FIG. 3 is an enlarged view of the seat cushion shown with paddings embedded inside the envelope and the air distribution box.

FIG. 4 is an enlarged view of the seat cushion with a self-supporting air distribution box and padding embedded inside the rest of the envelope.

FIG. 5 is a top interior view of the seat cushion shown in FIG. 3.

FIG. 6 is a top interior view of the seat cushion shown in FIG. 4.

FIG. 7 is a top view of another modification of the seat cushion.

As shown in FIG. 1 there is an embodiment of this invention. The seat cushion is in-between a person and a seat. The cushion includes an envelope 1 and an air tube 2. Inside the envelope 1 there are air distribution box 5 and flexible hollow supporting padding 3. One end of the air tube 2 is connected to the box 5 through envelope 1 by any suitable cushion coupler 7. The other end of the tube 2 is connected to an air source 9 by any suitable air source coupler 8. Envelope 1 has top and bottom wall members. The two wall members are connected to each other around the edges. It is to be understood that any suitable means such as heat welding, stitching, gluing, or the like may be used for connecting the two members of the envelope 1. It is also to be understood that the envelope 1 may be permanently attached to a seat, and formed as a part of the seat.

FIG. 2 shows the overall view of the seat cushion. Air distribution box 5 is located inside envelope 1. Envelope 1 and box 5 may be made of flexible vinyl, plastic, leather, fabric with vinyl backing, tightly knitted fabric, or other material with low air penetrability. Also envelope 1 and box 5 may be made of different materials. A plurality of air holes 6 are located around the edge wall of the box 5 for distributing air throughout the envelope 1. Air discharge openings 4 are located around the edge wall of the envelope 1 for air to exit. For clarity reasons, the padding 3 is not shown.

As shown in FIGS. 3 and 5, there are flexible hollow supporting paddings 3, which act as supporting media for envelope 1 and box 5, which also provide void space for motive air to flow through the box 5 and envelope 1. The paddings 3 may be in the shape of coils, wires, corrugations, protrusions, channels, or other suitable configurations. The material of padding 3 may be metal, plastic, rubber, or other suitable compositions.

FIGS. 4 and 6 show another embodiment of the present invention. Air distribution box 5 is made of self-supporting material, and without any padding 3 embedded within. The top and bottom members of the box 5 may be in the shape of circular, semi-circular, rectangular, or other suitable shapes. The edge walls of the box 5 can be bellow type with accordion pleats, or other suitable resilient types. It is apparent from FIGS. 3 and 4 that the air distribution box 5 and envelope 1 have approximately the same thickness. An important aspect of this invention is that the box 5 is a separate component and is without any connection to envelope 1 except at cushion coupler 7. Certain advantages of the present arrangement should be stressed (a) It is simpler in manufacturing separate components than a combined unit; (b) any difference in lateral movement between the top and bottom members of the envelope will not tear the box 5 and cause unwanted air leakages; (c) near the top of box 5, which is the initial contact area with the incoming motive air, the combined layer of the envelope 1 and the box 5 will result in lower heat transfer and minimizing over-cooling or over-heating sensation to a person sitting on it.

The air discharge openings 4 shown in FIGS. 2, 5, and 6 can be located on the top member of the envelope 1 near the edges. It is advantageous to include a plurality of air seeping holes in both members of the envelope to provide some direct ventilation and to reduce moisture condensation on the surface of the envelope 1.

FIG. 7 shows another embodiment of the present invention. The air distribution box 5 is shown as rectangular shape, and the air discharge openings 4 are located on the top member of the envelope 1 near the edges. For clarity reasons, the padding 3 is not shown.

The described embodiments are to be considered in all respects as illustrative and not restrictive since the invention may be embodied in other specific forms without departing from its spirit or essential characteristics. Therefore the scope of the invention is indicated by the claims rather than by the foregoing description, and all changes which come within the meaning and range of the equivalents of the claims are intended to be embraces therein.