Vertically adjustable table

Abstract

An adjustable height table includes a base frame, a slider frame assembly, a generally planar support surface and a lifting mechanism. The main portion of the base frame is formed by welding three tubular components to form an H-shape. Each of the end portions of the H-shape include a mounting to support a swiveling locking castor. Above each castor there extends from the H-shaped main portion, a vertically extending tubular post. The slider frame assembly also includes an H-shaped main portion formed of three tubular members. Four vertically extending hollow tubular column members are attached to the H-frame so that they may telescopingly engage the four vertically extending posts of the base frame. A generally planar support surface is attached to the top of the four vertically extending columns located on the slider frame. Located between the central tube of the H portion of the base frame and central tube of the slider frame assembly, there is located a lifting mechanism, preferably a hydraulic jack. This jack can be actuated by a pedal mechanism to lift the slider frame assembly relative to the base frame. A second pedal is provided in the lifting mechanism to have the slider frame lower at a controlled rate of descent. Additionally an anti-sway bar is provided to prevent the lifting pump pedal from swaying side to side when in use.

I claim:  
     
         1 . A portable, adjustable height load bearing structure comprising: 
 a base frame;    a slider frame assembly mounted on said base frame;    a generally planar support surface mounted on said slider frame assembly; and    a lifting mechanism attached to said base frame, said lifting mechanism having a first actuator usable by an operator to move the slider frame in a first direction, a second actuator usable by the operator to move the slider frame in a second direction.    
     
     
         2 . A structure according to  claim 1 , wherein said lifting mechanism has a stabilizer attached to said first actuator to prevent the actuator from swaying side to side when it is used.  
     
     
         3 . A structure according to  claim 1 , wherein said slider frame assembly has an H-shaped main body which connects four vertically extending columns.  
     
     
         4 . A structure according to  claim 1 , wherein said base frame has an H-shaped main body which connects four vertically extending posts.  
     
     
         5 . A structure according to  claim 1 , in which the base frame and slider frame assembly are telescopingly engaged.  
     
     
         6 . A structure according to  claim 1 , wherein said base frame has lockable castors attached thereto whereby said portable adjustable height loading structure may be easily moved from place to place.  
     
     
         7 . A structure according to  claim 1 , wherein said lifting mechanism is a hydraulic jack.  
     
     
         8 . A structure according to  claim 7 , wherein said hydraulic jack is actuated by a food pedal pump.  
     
     
         9 . A structure according to  claim 1 , wherein said stabilizer mechanism includes a bar, two guide tabs and a pump return spring.  
     
     
         10 . A structure according to  claim 1 , wherein said lifting mechanism includes a foot pedal adapted to control the descent rate of the slider frame.  
     
     
         11 . An adjustable height load bearing structure comprising: 
 a base frame;    a slider frame assembly mounted on said base frame having at least two legs connected by a tubular member;    a generally planar support surface mounted on said slider frame;    a lifting mechanism attached to said base frame for moving said slider frame relative to said base frame.    
     
     
         12 . A structure according to  claim 1 , wherein said lifting mechanism further comprises a foot pedal which extends outward from said base frame so as to be easily accessible by an operator.  
     
     
         13 . A structure according to  claim 1 , wherein said slider frame assembly has an H-shaped main body which connects four vertically extending columns.  
     
     
         14 . A structure according to  claim 1 , wherein said base frame has an H-shaped main body which connects four vertically extending posts.  
     
     
         15 . A structure according to  claim 11 , in which the base frame and slider frame assembly are telescopingly engaged.  
     
     
         16 . A structure according to  claim 11 , wherein said lifting mechanism is a hydraulic jack.  
     
     
         17 . A structure according to  claim 16 , wherein said hydraulic jack is actuated by a food pedal pump.  
     
     
         18 . A structure according to  claim 1 , wherein said stabilizer mechanism includes a bar, two guide tabs and a pump return spring.  
     
     
         19 . A structure according to  claim 1 , wherein said lifting mechanism includes a foot pedal adapted to control the descent rate of the slider frame assembly.