| 摘要 |
The structure comprises a front sub-frame comprising four front poles rotatably connected at ends to four front corner members at four corners. There is a rear sub-frame comprising four rear poles rotatably connected at ends to four rear corner members at four corners with a length-adjustable horizontal pole rotatably connected to each of the front corner members and the associated rear corner member to have the rear sub-frame spaced from and corresponding to the front sub-frame. Each of the rear corner members have a reinforcing bar rotatably connected at one end to it to extend from it in a diagonal direction to rotatably connect to a common central joint member at the other end. The central joint member is constituted by two halves to be rotatable relative to each other. Each of the front poles are constituted by two sections with one end of it rotatably connected to the respective front corner member and the other end pivoted to a front joint member. Each of the rear poles are constituted by two sections with one end of it rotatably connected to the respective rear corner member and the other end detachably connected to a rear joint member. |
