Laser leveling system, apparatus and method for building construction

Abstract

A leveling assembly to establish elevations in a building structure for installing cabinets, bookshelves, countertops, etc. There is a telescoping mounting post adapted to be positioned in bearing engagement between a floor surface and the top of a doorway, ceiling or other upper surface. A laser that transmits a horizontal laser beam is mounted to a mounting device that can be moved to different positions along the length of the post. Locking devices hold the laser mounting device in place, and also properly position the post to be in firm engagement with its bearing surfaces. The laser mounting device can be swung to upper and lower positions.

Therefore, I claim:  
     
         1 . A system for establishing a substantially horizontal reference line on a target surface the location of which is fixed relative to first and second support surfaces, the system comprising: 
 a post member defining a post axis and having a first end engaging the first support surface and second end engaging the second support surface;    a mounting member that, in a first state, engages the post member such that the mounting member may be moved along the post axis relative to the post member but may not move radially relative to the post axis;    a locking assembly for selectively securing the mounting member at a desired location along the post member; and    a lighting assembly that generates a light beam at a predetermined angle with respect to true horizontal; wherein 
 the lighting assembly is supported by the mounting member such that the light beam illuminates a target portion of the target surface and the target portion of the target surface has a predetermined relationship with the desired location along the post member.  
   
     
     
         2 . A system as recited in    claim 1   , in which the post member comprises first and second post sections movable relative to each other along the post axis, where the first post section defines the first end of the post member and the second post section defines the second end of the post member.  
     
     
         3 . A system as recited in    claim 2   , in which the post member further comprises a post locking system for selectively fixing the location of the first and second post sections relative to each other.  
     
     
         4 . A system as recited in    claim 1   , in which the mounting member comprises a lock portion that is secured to the mounting member by the locking assembly and a device portion that is rotatable about a mounting axis relative to the lock portion.  
     
     
         5 . A system as recited in    claim 1   , in which the mounting member, when in a second state, may be detached from the post member.  
     
     
         6 . A system for establishing a reference line on a target surface the location of which is fixed relative to first and second support surfaces, the system comprising: 
 a post member defining a post axis and having a first end engaging the first support surface and an second end engaging the second support surface;    a mounting member that, in a first state, engages the post member such that the mounting member may be moved along the post axis relative to the post member but may not move radially relative to the post axis;    a locking assembly for selectively securing the mounting member at a desired location along the post member; and    a lighting assembly that generates a rotating light beam that defines a light plane; wherein 
 the lighting assembly is supported by the mounting member such that the light beam illuminates a target portion of the target surface and the target portion of the target surface has a predetermined relationship with the desired location along the post member.  
   
     
     
         7 . A system as recited in    claim 6   , in which the post member comprises first and second post sections movable relative to each other along the post axis, where the first post section defines the first end of the post member and the second post section defines the second end of the post member.  
     
     
         8 . A system as recited in    claim 7   , in which the post member further comprises a post locking system for selectively fixing the location of the first and second post sections relative to each other.  
     
     
         9 . A system as recited in    claim 6   , in which the mounting member comprises a lock portion that is secured to the mounting member by the locking assembly and a device portion that is rotatable about a mounting axis relative to the lock portion.  
     
     
         10 . A system as recited in    claim 6   , in which the mounting member, when in a second state, may be detached from the post member.  
     
     
         11 . A method of establishing a reference line on a target surface the location of which is fixed relative to first and second support surfaces, the method comprising the steps of: 
 providing a post member defining a post axis and having a first end and a second end;    arranging the post member such that the first end engages the first support surface and the second end engages the second support surface;    mounting on the post member a lighting assembly that generates a light beam;    moving the lighting assembly to a desired location along the post axis such that the light beam illuminates a target portion of the target surface;    securing the lighting assembly at the desired location; and    moving the light beam to define a light plane that forms the reference line on the target surface.    
     
     
         12 . A method as recited in    claim 11   , further comprising the step of moving a first section of the post member relative to a second section of the post member along the post axis, where the first post section defines the first end of the post member and the second post section defines the second end of the post member.  
     
     
         13 . A method as recited in    claim 12   , further comprising the step of selectively fixing the location of the first and second post sections relative to each other.  
     
     
         14 . A method as recited in    claim 11   , further comprising the step of rotating the lighting assembly relative post member between first and second lighting positions.  
     
     
         15 . A method as recited in    claim 11   , further comprising the step of detachably securing the lighting assembly to the post member.