| 摘要 |
<p>PURPOSE:To extend and contract the extensioner by constituting a rack pinion mechanism into the two stage assembled constitution. CONSTITUTION:A member 1 is fixed and a member 2 is movable, and the distance between them can be extended and contracted. The axis centers of rack rods 3 and 4 are arranged in parallel, and the rack rod 4 formed integrally with the member 2 is engaged with a guide groove 6G formed on a fixed wall 6, and guided in the vertical direction, namely in the direction of axis centers of the rack rods 3 and 4. A guide groove 5G is formed also in the same direction on a fixed wall 5, and a holding frame 7 is guided in the guide groove 5G, in shiftable ways in the direction of the long axis centers of the rack rods 3 and 4. When a pinion gear 8 is revolution-driven by an electric motor 20, also a pinion gear 9 turns in the same direction, and the movable member 2 shifts in the vertical direction at the twice speed.</p> |
