US Patent 8490930 Telescopic supportive apparatus

A telescopic supportive apparatus includes an external tube, an internal tube, a mount, a toothed wheel, a handle, a first detent and a second detent. The internal tube is telescopically inserted in the external tube and formed with a series of recesses. The mount is secured to the external tube. The toothed wheel is supported on the mount and formed with teeth for insertion in the recesses. The handle is supported on the mount. The first detent is movably located on the mount and formed with a ratchet for engagement with the teeth. The second detent is movably located on the mount and formed with a ratchet for engagement with the teeth. The damping unit is located on the mount for damping the spinning of the toothed wheel and therefore the insertion of the internal tube into the external tube.