Self-Propelled Elevating Work Platform

Abstract

A self-propelled elevating work platform comprises a first workbench, a second workbench and a third workbench enclosed and connected on a conical column from the bottom to the top sequentially. Each workbench comprises at least two supporting frames which can be connected to form a circular shape. Retractable elements are disposed between any two of the adjacent workbenches. An anti-slip element is disposed on an inner side of each of the supporting frames, and each of the anti-slip elements can move radially relative to the conical column. Thereby, when any two of the workbenches are fixed by the anti-slip elements, the other workbench can be driven by the retractable elements to move up and down. Each of the workbenches can be pulled or pushed in order to move up or down gradually, so that the worker on the third workbench can work on the surface of the conical column.

1 . A self-propelled elevating work platform, comprising:
 a first workbench comprising at least two first supporting frames, each of the first supporting frames being connected to form a circular shape for enclosing and connecting on a conical column, a first anti-slip element being disposed on an inner side of each of the first supporting frames, each of the first anti-slip elements moving radially relative to the conical column, and each of the first supporting frames being fixed securely on the conical column by the first anti-slip elements;   a second workbench comprising at least two second supporting frames, each of the second supporting frames being connected to form a circular shape for enclosing and connecting on the conical column, the second workbench being disposed above the first workbench, a second anti-slip element being disposed on an inner side of each of the second supporting frames, each of the second anti-slip elements moving radially relative to the conical column, each of the second supporting frames being fixed on the conical column by the second anti-slip elements;   at least two first retractable elements, bottom ends of the first retractable elements being connected with the first supporting frames, top ends of the first retractable elements being connected with the second supporting frames, when the first workbench or the second workbench being positioned on the conical column, by the extending or retracting of the first retractable elements, the first workbench and the second workbench moving upward and downward relatively to each other;   a third workbench comprising at least two third supporting frames, each of the third supporting frames being connected to form a circular shape for enclosing and connecting on the conical column, the third workbench being disposed above the second workbench, a third anti-slip element being disposed on an inner side of each of the third supporting frames, each of the third anti-slip elements moving radially relative to the conical column, each of the third supporting frames being fixed on the conical column by the third anti-slip elements; and   at least two second retractable elements, bottom ends of the second retractable elements being connected with the second supporting frames, top ends of the second retractable elements being connected with the third supporting frames, when the second workbench or the third workbench being positioned on the conical column, by the extending or retracting of the second retractable elements, the second workbench and the third workbench moving upward and downward relatively to each other.   
     
     
         2 . The self-propelled elevating work platform as claimed in  claim 1 , wherein the first anti-slip element is connected to a first driving element, the second anti-slip element is connected to a second driving element and the third anti-slip element is connected to a third driving element, the first driving element, the second driving element and the third driving element drive the first anti-slip element, the second anti-slip element and the third anti-slip element to move radially relative to the conical column. 
     
     
         3 . The self-propelled elevating work platform as claimed in  claim 2 , wherein the first driving element, the second driving element and the third driving element are power cylinders respectively. 
     
     
         4 . The self-propelled elevating work platform as claimed in  claim 1 , wherein the third supporting frame comprises a flat plate and a vertical guardrail, the vertical guardrail is connected with an outer edge of the flat plate. 
     
     
         5 . The self-propelled elevating work platform as claimed in  claim 1 , wherein the first anti-slip element, the second anti-slip element and the third anti-slip element are an arc-shaped brake plate respectively. 
     
     
         6 . The self-propelled elevating work platform as claimed in  claim 1 , wherein the first retractable element, the second retractable element and the third retractable element are power cylinders respectively. 
     
     
         7 . The self-propelled elevating work platform as claimed in  claim 1 , wherein the third supporting frame is disposed with a horizontally extended positioning plate, and a positioning groove is disposed on the positioning plate. 
     
     
         8 . The self-propelled elevating work platform as claimed in  claim 2 , wherein the third supporting frame comprises a flat plate and a vertical guardrail, the vertical guardrail is connected with an outer edge of the flat plate. 
     
     
         9 . The self-propelled elevating work platform as claimed in  claim 2 , wherein the first anti-slip element, the second anti-slip element and the third anti-slip element are an arc-shaped brake plate respectively. 
     
     
         10 . The self-propelled elevating work platform as claimed in  claim 2 , wherein the first retractable element, the second retractable element and the third retractable element are power cylinders respectively. 
     
     
         11 . The self-propelled elevating work platform as claimed in  claim 2 , wherein the third supporting frame is disposed with a horizontally extended positioning plate, and a positioning groove is disposed on the positioning plate.