Abstract: An apparatus is disclosed for holding a flat object. The apparatus includes a post, a supporting mechanism movably connected to the post, a clamping mechanism pivotally connected to the post, and a linking element for linking the supporting mechanism and the clamping mechanism together. Thus, the flat object is clamped by the clamping mechanism clamps when the flat object is supported on the supporting mechanism.

Abstract: A detachable top tube apparatus includes two tubes, two spring-biased detents, two hooks, two latches and an elastic element. The tubes are telescopically connected to each other. Each of the spring-biased detents is connected to a related one of the tubes. Each of the hooks includes a portion inserted in a related one of the tubes. Each of the latches each including two wings pivotally connected to a related one of the tubes between a releasing position and a locking position. In the releasing position, each of the latches allows a portion of a bicycle to be hooked by and unhooked from the related hook. In the locking position, each of the latches retains the portion of the bicycle hooked by the related hook. The elastic element interconnects the tubes.

Abstract: A telescopic apparatus includes an internal tube telescopically inserted in an external tube. The internal tube includes depressions defined therein. A frame is secured to the external tube. A lever is pivotally connected to the frame. The lever includes a space transversely defined therein, a groove in communication with and in parallel to the space, and a pawl for insertion in a selected one of the depressions for locking the internal tube relative to the external tube. A spring is substantially located in the space. The spring includes a hook for hooking the frame and a bent section located in the groove. A short tube is located in the space and against the spring. A screw is inserted through the frame, the spring and the short tube. A security unit is movably connected to the frame between a locking position against the lever to avoid pivoting of the lever and a releasing position away from the lever to allow pivoting of the lever.

Abstract: An apparatus is disclosed for holding a flat object. The apparatus includes a post, a supporting mechanism movably connected to the post, a clamping mechanism pivotally connected to the post, and a linking element for linking the supporting mechanism and the clamping mechanism together. Thus, the flat object is clamped by the clamping mechanism clamps when the flat object is supported on the supporting mechanism.