| 摘要 |
PURPOSE:To facilitate the control of direction of a mirror by a structure wherein a ratchet pawl and rack type holding back mechanism is interposed between the mirror and a glass vacuum tube in the glass vacuum tube internal mirror focusing type solar heat collector, the internal mirror of which is shifted by means of a magnetic force generated by pivoting a pivoting member along the outer periphery of the glass vacuum tube. CONSTITUTION:The solar heat collector 1 is installed so that the longitudinal direction extends to east and west. When a ring R equipped with permanent magnets G is pivoted along the outer peripheral surface of the glass vacuum tube 2, a mounting disc 6 is magnetized and rotated, resulting in rotating a mirror 8 fitted to the disc 6. With the pivoting movement of the mirror 8, the ratchet pawl 10 is slided on the circular arc clutch 11 so as to get over the teeth of the clutch 11 one by one. At this time, because of the engagement between the ratchet pawl 10 and the clutch 11, the mirror 8 can hold its position without sliding back due to its own weight. Accordingly, the mirror 8 can hold its position even after the ring R is disassembled. Owing to the structure as described above, the control of the direction of the mirror 8 can be performed easily. |
