Human-body aimed spacer, human-body aimed airflow passage, and general-purpose spacer

1. A human-body aimed spacer for ensuring a space near a human body for allowing air to flow therethrough, comprising:

convex parts each comprising: a frame-shaped portion; a rising portion comprising column portions, or wall portions, or column portions and wall portions, each of them having one end formed to rise from the associated frame-shaped portion; and a rising-portion integrator for interconnecting the other ends of the associated rising portion with one another; and

flexible connecting portions having flexibility and interconnecting spaced apart adjacent ones of said convex parts with each other;

wherein said convex parts are formed in a number of at least 100 per 1 m 2 ; and

wherein said convex parts and said flexible connecting portions are formed of plastic integrally with one another.

2. The human-body aimed spacer of claim 1 , wherein said convex parts are each connected to four of said flexible connecting portions.

3. The human-body aimed spacer of claim 1 , wherein said flexible connecting portions are each formed of a strip-shaped member bendable to protrude to a side where said rising-portion integrators are formed.

4. The human-body aimed spacer of claim 1 , wherein the human-body aimed spacer has a density of 30% or less relative to a volume of the space defined by the human-body aimed spacer.

5. The human-body aimed spacer of claim 1 , wherein said frame-shaped portions and said flexible connecting portions are so formed that a ratio of area of opening regions, where said frame-shaped portions and said flexible connecting portions are not formed, is 50 to 95% of a whole area of the spacer face at the side where said frame-shaped portions are formed.

6. The human-body aimed spacer of claim 1 , wherein the human-body aimed spacer has a weight within 1 kg per 1 m 2 .

7. The human-body aimed spacer of claim 1 , wherein said convex parts each have a height of 3 mm to 50 mm.

8. The human-body aimed spacer of claim 1 , wherein the human-body aimed spacer has a pressure resistance of at least 1,000 kg per 1 m 2 , in terms of said convex parts.

9. The human-body aimed spacer of claim 1 , wherein said flexible connecting portions each extend to the associated frame-shaped portions.

10. The human-body aimed spacer of claim 9 , wherein said frame-shaped portions are each formed in a substantially rectangular shape, and

wherein said rising portions each comprise two wall portions rising from two opposite sides of an associated frame-shaped portion, respectively.

11. A human-body aimed airflow passage comprising:

the human-body aimed spacer of claim 1 , and

a sack-shaped sheet part insusceptible to air leakage and configured to cover said human-body aimed spacer, said sack-shaped sheet part comprising a sheet at a side contacting with a human body, and said sack-shaped sheet part having a moisture permeability at least through said sheet;

wherein said sack-shaped sheet part is formed with: an air inlet part for allowing air inflow therethrough; and an air outlet part for discharging air therethrough.

12. A general-purpose spacer comprising:

a plurality of convex parts each comprising: a frame-shaped portion; a rising portion comprising column portions, or wall portions, or column portions and wall portions, each of them having one end formed to rise from the associated frame-shaped portion; and a rising-portion integrator for interconnecting the other ends of the associated rising portion with one another; and

flexible connecting portions for interconnecting adjacent ones of said frame-shaped portions with each other in a longitudinal direction and a lateral direction of the general-purpose spacer, said flexible connecting portions each having flexibility capable of being bent by about 180 degrees while keeping the associated convex parts outside;

wherein, assuming that a pitch between centers of adjacent two of said convex parts is P millimeters, the general-purpose spacer is so formed that: P is 5 to 200; the general-purpose spacer has a density p of (10/P+0.2) % to (120/P+10) %, relative to a volume of space defined by the general-purpose spacer; and the height “h” of the general-purpose spacer is (3 to P) millimeters; and

wherein said convex parts and said flexible connecting portions are formed of plastic integrally with one another.

13. The general-purpose spacer of claim 12 , wherein the plastic is polyethylene or polypropylene.

14. The general-purpose spacer of claim 12 , wherein said flexible connecting portions each have a length L of P×(10% to 60%) millimeters.

15. The general-purpose spacer of claim 12 , wherein said rising portions are each formed in an inclined manner so that the applicable rising portion approaches a central axis of an associated one of said convex parts as the applicable rising portion approaches from an associated one of said frame-shaped portions toward an associated one of said rising-portion integrators.

16. The general-purpose spacer of claim 12 , wherein said frame-shaped portions are each formed in a substantially rectangular shape, and

wherein said rising portions each comprise two wall portions rising from two opposite sides of an associated frame-shaped portion, respectively.

17. The general-purpose spacer of claim 12 , wherein said frame-shaped portions are each formed in a substantially rectangular shape, and

wherein said rising portions each comprise four column portions rising from an associated frame-shaped portion.