Patent attributes
A suction device includes a sucking disc disposed under an upright sleeve, a connecting seat disposed in the sleeve and connected to the sucking disc, and an elongate operating block mounted slidably on the sleeve. The operating block is formed with a cam surface biased to contact a follower portion of the connecting seat. When the operating block is moved relative to the sleeve from a non-sucking position, where the follower portion engages a second positioning portion of the operating block, to a sucking position, where the follower portion engages a first positioning portion of the operating block, the cam surface pushes the connecting seat to move away from a supporting surface, thereby forming a vacant space between the sucking disc and the supporting surface.
