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A cabinet door buffer bar includes a hollow tube, a shaft, an elastic element and a sliding member. The sliding member and the inner wall of the hollow tube form different intervals there between so that a resilient member mounted thereon receives varying constraints and generates different buffer f

A cabinet door buffer bar includes a hollow tube, a shaft, an elastic element and a sliding member. The sliding member and the inner wall of the hollow tube form different intervals there between so that a resilient member mounted thereon receives varying constraints and generates different buffer forces in different moving directions thereby provides the cabinet door a required buffer force to avoid generating annoying noise and incurring damages during closing of the cabinet door.

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What is claimed is: 1. A cabinet door buffer bar, mounted onto a cabinet having a pivot axle between a cabinet door and a cabinet wall, the cabinet door buffer bar providing a buffer for the cabinet door during closing, comprising: a hollow tube mounted onto the cabinet door or the cabinet wall, an

What is claimed is: 1. A cabinet door buffer bar, mounted onto a cabinet having a pivot axle between a cabinet door and a cabinet wall, the cabinet door buffer bar providing a buffer for the cabinet door during closing, comprising: a hollow tube mounted onto the cabinet door or the cabinet wall, and abutting one of the cabinet door and the cabinet wall, said hollow tube having a housing compartment; a shaft movably located in the housing compartment, the shaft having a tongue on a rear end thereof exposed outside the hollow tube, the shaft having a front end with a diameter smaller than a rear end, the shaft being adjacent an inner wall of the hollow tube, differences in diameter of the shaft forming a gap with portions of different dimensions between the shaft and the inner wall of the hollow tube in the axial direction of the shaft; an elastic element located in the hollow tube pressing the shaft to expose the tongue outside the hollow tube in normal conditions; and a resilient member connected to the front end of the shaft, the resilient member having a portion in contact with the inner wall of the hollow tube; wherein when pushing the tongue of the shaft, inwards the resilient member generates greater friction with the inner wall than when the tongue is moved outwards due to the resilient member being moved toward the smaller gap between the shaft and the inner wall of the hollow tube during pushing of the tongue and being moved away from the smaller gap when the tongue is moved outwards whereby, a greater buffer force is provided during pushing of the tongue than during outward movement of the tongue. 2. The cabinet door buffer bar of claim 1, wherein the tongue has a distal end formed in a curved shape to smooth contact with the cabinet door or the cabinet wall. 3. The cabinet door buffer bar of claim 1, wherein the elastic element is a spring. 4. The cabinet door buffer bar of claim 1, wherein the elastic element has a maintaining force smaller than the returning force of the cabinet door. 5. A cabinet door buffer bar, mounted onto a cabinet having a pivot axle between a cabinet door and a cabinet wall, the cabinet door buffer bar providing buffer for the cabinet door during closing, comprising: a hollow tube mounted onto the cabinet door or the cabinet wall, and abutting one of the cabinet door and the cabinet wall, said hollow tube having a housing compartment; a shaft movably located in the housing compartment, the shaft having a tongue on a rear end thereof exposed outside the hollow tube; an elastic element located in the hollow tube pressing the shaft to expose the tongue outside the hollow tube in normal conditions; and a sliding member located in the housing compartment between an outer side of the shaft and the hollow tube, the sliding member being movably connected to the shaft through a coupling ring made from a buffer material; wherein the tongue is movable inwards when subject to the compression of the cabinet door to compress the elastic element such that the coupling ring is blocked by the sliding member and expands slightly radially to generate a friction force between the coupling ring and an inner wall of the hollow tube to provide a buffer force; when the tongue moves outwards, the coupling ring drags the sliding member such that the coupling ring shrinks slightly radially. 6. The cabinet door buffer bar of claim 5, wherein the tongue has a distal end formed in a curved shape to smooth contact with the cabinet door or the cabinet wall. 7. The cabinet door buffer bar of claim 5, wherein the elastic element is a spring. 8. The cabinet door buffer bar of claim 5, wherein the elastic element has a maintaining force smaller than a returning force of the cabinet door. 9. The cabinet door buffer bar of claim 5, wherein the sliding member having a front end with smaller diameter to form a gap with portions of different dimensions in the axial direction of the shaft. 10. The cabinet door buffer bar of claim 9, wherein the sliding member is coupled with a resilient member on the front end which has a portion in contact with the inner wall of the hollow tube, wherein when pushing the tongue of the shaft inwards, the resilient member generates greater friction than when the tongue is moved outwards due to the resilient member being moved to a smaller gap when the tongue is moved outwards, whereby a greater buffer force is provided during pushing of the tongue than during outward movement of the tongue. 11. The cabinet door buffer bar of claim 5, further having an adjustment member movably mounted on the front end of the shaft having a neck section of a smaller thickness to house the adjustment member such that an interval between the sliding member and adjustment member is adjustable through the adjustment member. 12. The cabinet door buffer bar of claim 5, further having a bracket for fastening to a hinge of the cabinet door. 13. The cabinet door buffer bar of claim 12, wherein the bracket has an annular member for installing and anchoring the cabinet door buffer bar. 14. The cabinet door buffer bar of claim 12, wherein the bracket has a hook section to fasten to a hinge seat.