| 摘要 |
An expandable tent support frame, comprising: a base (1) and a transmission mechanism provided on the base (1). The transmission mechanism comprises two screw rods (4), two screw nuts (3), and two control lever sets (2), all provided on the base (1) in parallel. The screw nuts (3) match with thread segments on the screw rods (4), and each of the screw nuts (3) is hingedly connected to one end of one of the control lever sets (2). The other ends of the two control lever sets (2) are hingedly connected to the same U-shaped bar (5), and two ends of the U-shaped bar (5) are hingedly connected to the base (1). The two screw rods (4) transmit motion by connecting to a transition shaft (11) provided in a direction perpendicular thereto, and the two screw rods (4) are ensured to move in a synchronized manner. One end of each of the screw rods (4) is provided with a first bevel gear (9). The two first bevel gears (9) are respectively engaged with second bevel gears (10) on two ends of the transition shaft (11). One of the two screw rods (4) is connected to a driving mechanism. The support frame allows smooth motion transmission and reduces the possibility of jamming of the transmission mechanism. |
