Hidden electric power elevating stand structure

Abstract

An improved hidden electric power elevating stand structure includes upper and lower symmetric frame bodies, and upper and lower braking rods crossed with each other for fixing the upper and lower frame bodies on their lateral sides longitudinally, a transversal rod disposed at the bottom of the lower braking rod, a bearing installed separately on both sides of the transversal rod, such that the bearing is connected to a sliding track on both sides of the lower frame body, an electric power screw rod connects one of the transversal rods of the lower braking rod to the intersection of the upper braking rod, so that the extension and withdrawal of the screw rod change the intersecting angle of the braking rods and adjust the elevation of the frame bodies for placing an audio/video equipment such as a projector or a speaker. Symmetric microswitches are installed on the internal side of the track at the lower frame body to define the limit position for displacement and an elevator is installed on a detachable fixing stand to facilitate the construction and adjust the angle of elevation and the level of the stand.

1 . An improved hidden electric power elevating stand structure, comprising upper and lower frame bodies, a track disposed longitudinally along the lateral sides of said upper and lower frame bodies respectively for sliding the top of an upper braking rod and the bottom of a lower braking rod, and said braking rods are crossed with each other and connected to said upper and lower frame bodies respectively to constitute said upper and lower braking rods to be stacked inwardly or spread out and to constitute the elevation of said elevating stand; characterized in that: 
 a transversal rod disposed at the bottom of said lower braking rod is coupled to a screw rod by a U-shape fixing plate, thereby the front end of said screw rod is coupled to a transversal rod disposed at the intersection of said upper braking rod, and the extension or withdrawal of said screw rod controls said upper and lower braking rods to be stacked inwardly or spread out;    a support plate is fixed at an appropriate distance from the bottom of said lower frame body by a plurality of screws disposed at the four corners of a fixing rod; and    an n-shape fixing stand includes a horizontal long hole and a vertical long hole separately and respectively disposed at the front end and rear ends of said fixing stand, such that said lower frame body is fixed onto said fixing stand by passing a screw bolt through said long holes to facilitate the installation and construction of said elevating stand, and said vertical, and said vertical long hole of said fixing stand constitutes the adjustment of an angle of elevation for said elevating stand, and a plurality of positioning holes is disposed at a top panel of said fixing stand for adjusting the horizontal attachment with a ceiling by securing said screw upward to a predetermined tightness.    
     
     
         2 . The improved hidden electric power elevating stand structure of  claim 1 , wherein said upper and lower braking rods include a transversal rod at both ends, and separately have a bearing such that said bearing are sheathed into said track of said frame bodies for facilitating a free and smooth slide.  
     
     
         3 . The improved hidden electric power elevating stand structure of  claim 1 , wherein said upper and lower frame bodies separately have different sockets and connectors for externally connecting a power supply or a control device.  
     
     
         4 . The improved hidden electric power elevating stand structure of  claim 1 , wherein said upper and lower frame bodies separately have a meshed contractible hood for covering said upper and lower frame bodies to provide ventilation for said elevating stand.