Expandable scaffold with wheel lock

Abstract

A scaffold includes two or more legs and an expandable platform assembly having at least two shelves. At least one of the shelves slides in a lengthwise direction in relation to the others.

1 . A scaffold comprising: 
 a plurality of legs; and    an expandable platform assembly supported by the legs, the platform assembly comprising at least two shelves, at least one of the shelves sliding in a lengthwise direction in relation to the others in a telescoping fashion.    
   
   
       2 . The scaffold of  claim 1 , further comprising: 
 a first shelf comprising a first rail;    a second shelf comprising a second rail; and    the first rail coupled to slide within the second rail, and the first shelf coupled to slide under the second shelf.    
   
   
       3 . The scaffold of  claim 2 , further comprising: 
 a rail lock coupled to the outer rail, the rail lock comprising a pin and a spring.    
   
   
       4 . The scaffold of  claim 2 , further comprising: 
 the inner rail comprising a flange to support the first shelf;    the outer rail comprising a flange to support the second shelf; and    the outer rail comprising a gap through which the flange of the inner rail protrudes.    
   
   
       5 . The scaffold of  claim 4 , further comprising: 
 at least one of the flange of the inner rail and the flange of the outer rail comprising a plurality of posts to stabilize at least one of the first and second shelves, respectively.    
   
   
       6 . The scaffold of  claim 2 , further comprising: 
 a transition to alleviate the abruptness of an edge between the first and second shelves.    
   
   
       7 . The scaffold of  claim 1 , further comprising: 
 at least one leg comprising a rod;    a spring to urge the rod through an aperture in a caster and into contact with a wheel; and    the aperture formed to pass the rod in limited orientations of the rod with respect to the caster.    
   
   
       8 . The scaffold of  claim 7 , further comprising: 
 the rod comprising corners and the aperture comprising points.    
   
   
       9 . The scaffold of  claim 7 , further comprising: 
 the rod comprising a handle positioned such that a worker on the platform assembly may use the handle to lift the rod out of contact with the wheel and clear of the aperture.    
   
   
       10 . The scaffold of  claim 8 , further comprising: 
 the rod comprising a substantially square cross section and the aperture comprising one of eight and sixteen points.    
   
   
       11 . The scaffold of  claim 1 , further comprising: 
 an expandable safety rail.    
   
   
       12 . A scaffold comprising: 
 at least one leg comprising a rod;    a spring to urge the rod through an aperture in a caster and into contact with a wheel; and    the aperture formed to pass the rod in limited orientations of the rod with respect to the caster.    
   
   
       13 . The scaffold of  claim 12 , further comprising: 
 the rod comprising corners and the aperture comprising points.    
   
   
       14 . The scaffold of  claim 12 , further comprising: 
 the rod comprising a handle positioned such that a worker on the platform assembly may use the handle to lift the rod out of contact with the wheel and clear of the aperture.    
   
   
       15 . The scaffold of  claim 13 , further comprising: 
 the rod comprising a substantially square cross section and the aperture comprising one of eight and sixteen points.