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An air damper is provided which can exhibit an appropriate braking force in accordance with an input load. There is provided an air damper including: a tubular cylinder 1 in which both end portions are opened; a piston 2 which moves within the cylinder 1; and a cap 3 which closes a one-end opening o

An air damper is provided which can exhibit an appropriate braking force in accordance with an input load. There is provided an air damper including: a tubular cylinder 1 in which both end portions are opened; a piston 2 which moves within the cylinder 1; and a cap 3 which closes a one-end opening of the cylinder 1, wherein the cylinder 1 has an annular seal surface 4 formed on a circumferential surface of the one-end opening, wherein the cap is mounted on the one-end opening side of the cylinder 1 so as to be moveable or deformable along an axial direction of the cylinder 1, wherein the cap is brought into contact with or separated from the seal surface 4 in accordance with a pressure change due to a movement of the piston 2 within the cylinder 1, and wherein a first orifice 14 is opened in a base plate 12 of the cap, characterized in that: a second orifice having an inlet area smaller than the first orifice is defined between the cap 3 and the cylinder 1 during an operation of the first orifice 14.

대표청구항 ▼

1. An air damper comprising: a tubular cylinder in which both end portions are opened;a piston which moves within the cylinder; anda cap which closes a one-end opening of the cylinder,wherein the cylinder has an annular seal surface formed on a circumferential surface of the one-end opening,wherein

1. An air damper comprising: a tubular cylinder in which both end portions are opened;a piston which moves within the cylinder; anda cap which closes a one-end opening of the cylinder,wherein the cylinder has an annular seal surface formed on a circumferential surface of the one-end opening,wherein the cap is mounted on the one-end opening side of the cylinder so as to be moveable or deformable along an axial direction of the cylinder,wherein the cap is brought into contact with or separated from the seal surface in accordance with a pressure change due to a movement of the piston within the cylinder,wherein a first orifice is opened in a base plate of the cap,wherein an abutment portion which is smaller than a diameter of the seal surface but is larger than a diameter of the first orifice exists between the cap and the cylinder, andwherein a second orifice having an inlet area smaller than the first orifice is defined between the cap and the cylinder when the cap is brought into contact with the cylinder at the abutment portion during an operation of the first orifice. 2. The air damper of claim 1, wherein a groove which is formed on an abutment surface of the abutment portion and which extends in an outside diameter direction of the abutment portion, andwherein the second orifice is defined by the groove. 3. The air damper of claim 1, wherein fine concave-convex shapes are formed on an abutment surface of the abutment portion, andwherein the second orifice is defined by the fine concave-convex shapes. 4. The air damper of claim 1, wherein a through hole communicating with an interior of the cylinder is formed in the abutment portion, andwherein the second orifice is defined by the through hole. 5. The air damper of claim 2, wherein the abutment portion has a recess-like space whose diameter is larger than the first orifice. 6. The air damper of claim 1, wherein the abutment portion has a recess-like space whose diameter is larger than the first orifice, andwherein a through hole is formed in a bottom portion or a side portion of the recess-like space. 7. The air damper of claim 2, wherein the groove is formed on a cap side. 8. The air damper of claim 3, wherein the fine concave-convex shapes are formed on a cap side. 9. The air damper of claim 1, wherein the first orifice is positioned on an axis of the cylinder. 10. The air damper of claim 2, wherein the cap comprises a soft material. 11. The air damper of claim 3, wherein the abutment portion has a recess-like space whose diameter is larger than the first orifice. 12. The air damper of claim 3, wherein the cap comprises a soft material. 13. The air damper of claim 1, wherein the abutment portion comprises a portion of the cylinder and a portion of the cap. 14. The air damper of claim 1, wherein a groove is formed on the cap, and wherein the second orifice is defined by the groove. 15. The air damper of claim 1, wherein the second orifice is configured so as to be in series with the first orifice when the cap is brought into contact with the cylinder at the abutment portion during the operation of the first orifice. 16. The air damper of claim 2, wherein a portion of the groove is disposed radially outward of the abutment portion. 17. The air damper of claim 1, wherein the abutment portion includes an abutment tube at the one-end opening side of the cylinder so as to contact the base plate of the cap radially outward of the first orifice. 18. The air damper of claim 1, wherein the cap comprises locking pieces which attach to locking holes of the cylinder. 19. The air damper of claim 1, wherein the cap is mounted on the one-end opening side of the cylinder so as to be deformable along the axial direction of the cylinder. 20. An air damper comprising: a tubular cylinder in which both end portions are opened;a piston which moves within the cylinder; anda cap which closes a one-end opening of the cylinder,wherein the cylinder has an annular seal surface formed on a circumferential surface of the one-end opening,wherein the cap is mounted on the one-end opening side of the cylinder so as to be moveable or deformable along an axial direction of the cylinder,wherein the cap is brought into contact with or separated from the seal surface in accordance with a pressure change due to a movement of the piston within the cylinder,wherein a first orifice is opened in a base plate of the cap, andwherein a second orifice having an inlet area smaller than the first orifice is defined between the cap and the cylinder during an operation of the first orifice, the second orifice being provided separately from the first orifice.