| 摘要 |
A HEIGHT-ADJ USTABLE TABLE (3) INCLUDES TWO TOP FRAMES (52) CONNECTED TELESCOPICALLY AND RESPECTIVELY TO BOTTOM FRAMES (51) THEREOF AND SUPPORTING A TABLETOP (4) , TWO LOWER THREADED MEMBERS (61) FIXED RESPECTIVELY TO THE BOTTOM FRAMES (51), TWO GEAR UNITS EACH INCLUDING UPPER AND LOWER BEVEL GEARS (64, 64'), AND A MIDDLE BEVEL GEAR (64") MESHING WITH THE UPPER AND LOWER BEVEL GEARS (64, 64'), AND TWO UPPER THREADED MEMBERS (62) FIXED RESPECTIVELY TO THE LOWER BEVEL GEARS (64') OF THE GEAR UNITS AND ENGAGED RESPECTIVELY TO THE UPPER THREADED MEMBERS (62). A CRANK HANDLE (67) EXTENDS THROUGH THE TABLETOP (4) TO CONNECT CO-ROTATABLY WITH THE UPPER BEVEL GEAR (64) OF ONE OF THE GEAR UNITS. A LINK ROD (65) INTERCONNECTS FIXEDLY THE MIDDLE BEVEL GEARS (64") OF THE GEAR UNITS SO AS TO ALLOW ROTATION OF THE MIDDLE BEVEL GEAR (64") OF ONE OF 'THE GEAR UNITS TO BE TRANSFERRED TO THE MIDDLE BEVEL GEAR (64") OF THE OTHER ONE OF THE GEAR UNITS THERETHROUGH.
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