| 摘要 |
PROBLEM TO BE SOLVED: To provide a height adjuster that has a wide adjustable range and sufficient strength. SOLUTION: An inner circumference of an open lower end of an upper pipe 1 fixed on a supported object is a first taper surface 4. An open upper end of a lower pipe 2 with a lower end butting against an installation surface is a second taper surface 5. An inner circumference of a first fixing member 6, which is in slidable contact with an inner circumference of the upper pipe, is a third taper surface 8. An outer circumference of a second fixing member 7, which is in slidable contact with an outer circumference of the lower pipe, is a fourth taper surface 9 in contact with the first taper surface 4. The first and second fixing members are at an arbitrary interval set by screw rods 10 and nuts 11. The lower pipe 2 is inserted in the upper pipe 1 via the two fixing members coupled by the screw rods. The taper surfaces 4 and 9, and 5 and 6 of the two pipes 1 and 2 and the two fixing members 6 and 7 create a wedge effect to provide strong axial rigidity and endure large moment.
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