Patent ID: 7475996
Filing Date: 2009-01-13
Classification: F16M,G03B

Abstract:
1. An elevating device comprising: a base plate defining a longitudinal direction and formed with a through hole extending in a transverse direction with respect to said longitudinal direction, said base plate having a top cover protruding upwardly therefrom to shield said through hole, said top cover having opposite front and rear portions; a sliding member disposed on said base plate surrounding said top cover, and slidable relative to said base plate in said longitudinal direction, said sliding member including a pushing part adjacent to said front portion of said top cover, a coupling part adjacent to said rear portion, and a first engaging tongue protruding from said coupling part into said top cover; a first urging member disposed between said pushing part and said front portion; a hollow wall structure disposed within said top cover adjacent to said front portion, and extendible outwardly in said transverse direction from said top cover; a first rack member disposed within said top cover behind said hollow wall structure and spaced apart from said first engaging tongue, said first rack member having a second engaging tongue protruding forwardly to support said hollow wall structure, thereby retaining said hollow wall structure within said top cover; a second rack member disposed movably within said hollow wall structure, and having a lower section protruding outwardly from said hollow wall structure in said transverse direction to engage said second tongue of said first rack member such that said first rack member is movable together with said second rack member when said second rack member moves further downward in said transverse direction; a second urging member disposed between said hollow wall structure and said first rack member, and biasing said hollow wall structure to press said first rack member to engage with said first tongue of said sliding member, thereby retaining said first rack member within said top cover; and a third urging member disposed within said top cover for urging said second rack member in said transverse direction to protrude outwardly from said hollow wall structure.