Drywall Lift

Abstract

A four-bar linkage based lift is operable by a single person. The lift is used to raise a drywall panel to a ceiling, allowing the drywall panel to be mounted to the ceiling rafters. The lift includes a base link structure, an upright link structure, a working link structure, and a supporting link structure. The upright link structure is adjacently connected to the base link structure, while a first axle creates a hinged connection between the working link structure and the upright link structure. The working link structure can thus be rotated upwards in order to lift a drywall panel, the drywall panel being supported by a drywall retaining shelf of the working link structure. The supporting link structure, formed of an independent first stay and second stay, can be rotated to an upright position to support the raised working link structure.

What is claimed is: 
     
         1 . A drywall lift comprises:
 a base link structure;   an upright link structure;   a working link structure;   a supporting link structure;   the working link structure comprises a drywall retaining shelf;   the supporting link structure comprises a first stay and a second stay;   the upright link structure being adjacently and perpendicularly connected to the base link structure;   the working link structure being hingedly connected to the upright link structure through a first axle;   the working link structure being oppositely positioned from the base line structure across the upright link structure;   the supporting link structure being hingedly connected to the working link structure through a second axle; and   the supporting link structure being oppositely positioned from the upright link structure across the working link structure.   
     
     
         2 . The drywall lift as claimed in  claim 1  comprises:
 a first buttress and a second buttress; 
 the first buttress and the second buttress being oppositely positioned of each other across the base link structure and the upright link structure; 
 the first buttress being angularly connected between the base link structure and the upright link structure; 
 the second buttress being angularly connected between the base link structure and the upright link structure; 
 the first stay being hingedly connected with the working link structure; 
 the first stay being adjacently positioned with the first buttress; 
 the second stay being hingedly connected with the working link structure; and 
 the second stay being adjacently positioned with the second buttress. 
 
     
     
         3 . The drywall lift as claimed in  claim 1  comprises:
 the drywall retaining shelf being adjacently positioned with a top surface of the working link structure; and 
 the drywall retaining shelf being centrally connected with the working link structure. 
 
     
     
         4 . The drywall lift as claimed in  claim 1  comprises:
 the upright link structure, the first stay, and the second stay each comprise a fixed member, an extension member, and a locking mechanism; 
 the extension member being slidably engaged with the fixed member; 
 the locking mechanism being mounted to the fixed member; and 
 the locking mechanism being selectively engaged with the extension member. 
 
     
     
         5 . The drywall lift as claimed in  claim 1  comprises:
 the base link structure comprises a first leg and a second leg; 
 the upright link structure comprises a first pillar and a second pillar; 
 the working link structure comprises a first arm and a second arm; 
 the first pillar being connected perpendicular to the first leg; 
 the second pillar being connected perpendicular to the second leg; and 
 the drywall retaining shelf being connected across the first arm and the second arm. 
 
     
     
         6 . The drywall lift as claimed in  claim 5  comprises:
 the first axle traversing through the first pillar, the second pillar, the first arm, and the second arm; 
 the first axle being positioned opposite the base link structure along the first pillar and the second pillar; and 
 the first axle being positioned opposite the supporting link structure along the first arm and the second arm. 
 
     
     
         7 . The drywall lift as claimed in  claim 5  comprises:
 the second axle traversing through the first arm, the second arm, the first stay, and the second stay; 
 the second axle being positioned opposite the upright link structure along the first arm and the second arm; and 
 the second axle being positioned adjacent to the working link structure along the first stay and the second stay. 
 
     
     
         8 . The drywall lift as claimed in  claim 5  comprises:
 the working link structure further comprises an at least one cross brace; and 
 the at least one cross brace being perpendicularly connected with the first arm and the second arm. 
 
     
     
         9 . A drywall lift comprises:
 a base link structure;   an upright link structure;   a working link structure;   a supporting link structure;   the working link structure comprises a drywall retaining shelf;   the supporting link structure comprises a first stay and a second stay;   a first buttress and a second buttress;   the upright link structure, the first stay, and the second stay each comprise a fixed member, an extension member, and a locking mechanism;   the base link structure comprises a first leg and a second leg;   the upright link structure comprises a first pillar and a second pillar;   the working link structure comprises a first arm and a second arm;   the upright link structure being adjacently and perpendicularly connected to the base link structure;   the working link structure being hingedly connected to the upright link structure through a first axle;   the working link structure being oppositely positioned from the base line structure across the upright link structure;   the supporting link structure being hingedly connected to the working link structure through a second axle;   the supporting link structure being oppositely positioned from the upright link structure across the working link structure;   the first buttress and the second buttress being oppositely positioned of each other across the base link structure and the upright link structure;   the extension member being slidably engaged with the fixed member;   the locking mechanism being mounted to the fixed member; and   the locking mechanism being selectively engaged with the extension member.   
     
     
         10 . The drywall lift as claimed in  claim 9  comprises:
 the first buttress being angularly connected between the base link structure and the upright link structure; 
 the second buttress being angularly connected between the base link structure and the upright link structure; 
 the first stay being hingedly connected with the working link structure; 
 the first stay being adjacently positioned with the first buttress; 
 the second stay being hingedly connected with the working link structure; and 
 the second stay being adjacently positioned with the second buttress. 
 
     
     
         11 . The drywall lift as claimed in  claim 9  comprises:
 the drywall retaining shelf being adjacently positioned with a top surface of the working link structure; and 
 the drywall retaining shelf being centrally connected with the working link structure. 
 
     
     
         12 . The drywall lift as claimed in  claim 9  comprises:
 the first pillar being connected perpendicular to the first leg; 
 the second pillar being connected perpendicular to the second leg; and 
 the drywall retaining shelf being connected across the first arm and the second arm. 
 
     
     
         13 . The drywall lift as claimed in  claim 9  comprises:
 the first axle traversing through the first pillar, the second pillar, the first arm, and the second arm; 
 the first axle being positioned opposite the base link structure along the first pillar and the second pillar; and 
 the first axle being positioned opposite the supporting link structure along the first arm and the second arm. 
 
     
     
         14 . The drywall lift as claimed in  claim 9  comprises:
 the second axle traversing through the first arm, the second arm, the first stay, and the second stay; 
 the second axle being positioned opposite the upright link structure along the first arm and the second arm; and 
 the second axle being positioned adjacent to the working link structure along the first stay and the second stay. 
 
     
     
         15 . The drywall lift as claimed in  claim 9  comprises:
 the working link structure further comprises an at least one cross brace; and 
 the at least one cross brace being perpendicularly connected with the first arm and the second arm.