Height Adjustable Work Platform Apparatus

Abstract

A height adjustable work platform apparatus. The height adjustable work platform apparatus includes a frame slidably supporting a cantilevered platform for supporting articles thereon. The platform is slidably engaged with a pair of rails disposed on the frame, which allows the platform to be adjusted vertically. The apparatus further includes a spring-biased pin disposed on the undersurface of the platform that is configured to engage complementary slots disposed on the surface of the upright members of the frame. A vertically-biased pulley system internal to the frame biases the platform to a raised position in order to reduce the amount of effort required to lift the platform. The frame of the apparatus includes a lower portion that is sized and shaped to receive the frame of the platform, thereby allowing the platform to rest flush against the lower portion when fully lowered.

I claim: 
     
         1 ) A height-adjustable platform apparatus, comprising:
 a first upright member including a first rail extending longitudinally therealong;   a second upright member including a second rail extending longitudinally therealong;   a platform including a frame, a first distal end of the frame including a wheel slidably engaged with the first rail and a second distal end of the frame including a wheel slidably engaged with the second rail;   a spring-biased pin disposed on the platform, the spring-biased pin biased towards an extended position;   the first upright member including a plurality of slots disposed along a surface thereof, the plurality of slots configured to receive the spring-biased pin;   wherein engagement of the spring-biased pin with one of the plurality of slots prevents the platform from moving longitudinally along the first upright member and the second upright member;   a vertically-biased pulley assembly comprising a pulley disposed within the first upright member, the pulley including a cable;   wherein the vertically-biased pulley assembly is configured to bias the platform to a raised position;   a first end of the cable connected to a spring and a second end of the cable connected to the frame of the platform; and   wherein the spring is biased to exert a vertical force on the platform via the pulley.   
     
     
         2 ) The height-adjustable platform apparatus of  claim 1 , wherein the vertically-biased pulley assembly is enclosed within the first upright member. 
     
     
         3 ) The height-adjustable platform apparatus of  claim 1 , further comprising a lever in mechanical communication with the spring-biased pin, the lever configured to retract the spring-biased pin when actuated. 
     
     
         4 ) The height-adjustable platform apparatus of  claim 1 , further comprising:
 an upper frame portion including the first upright member and the second upright member;   a lower frame portion extending perpendicularly from the upper frame portion, the lower frame portion including an open interior configured to receive the frame of the platform.