| 摘要 |
The object of this invention is to provide a bridge seat. This bridge seat includes an upper plate (1), with two guide rails (2, 2a) longitudinally mounted on the lower surface of the upper plate along opposite side edges. A middle plate (3) movably engages with the two guide rails at its opposite side edges such that a gap is left between each side edge of the middle plate and an associated guide rail. This middle plate (3) has a longitudinal boss (5) on its lower surface, with an axial hole (4) formed in the boss (5). A lower plate (6) has a longitudinal groove (7) of a semicircular cross-section on its upper surface, and rotatably seats the boss (5) of the middle plate (3) in the groove (7). Two end plates (8, 9) cover the opposite ends of the upper, middle and lower plates. The end plates (8, 9) each have a shaft hole (8a, 9a) at a position corresponding to the longitudinal hole (4) of the boss (5). A shaft (11) is set in the aligned holes (4, 8a, 9a) of the boss and two end plates. |
