Remote-control device for a crane

Abstract

A remote-control assembly for controlling a crane or the like which completely insulates the operator of the remote-control assembly from electric shock. The remote-control assembly includes a remote-control box having a plurality of fluid valves, a converter box including a plurality of pressure switches, and a plurality of fluid lines connecting the fluid valves to the pressure switches. The pressure switches are electrically connected to an electric plug which is adapted to be connected to the electrical control box on the chassis of the crane for operating the crane.

What is claims is: 
     
       1. A remote-control assembly for controlling a crane or the like having a movable member, wherein said crane includes an electrical control circuit for controlling said movable member, comprising: a remote-control box including a plurality of fluid valves and means for operating said fluid valves;   a converter box including a plurality of pressure switches;   each of said pressure switches including a diaphragm having at least one electrical contact mounted thereon;   each of said pressure switches being formed by a separate housing for enclosing said diaphragm and said electrical contact;   a plurality of fluid lines connecting said fluid valves to operate the diaphragms in each of said pressure switches; and   a plurality of electric lines connecting the electrical contacts of said pressure switches to said electrical control circuit on said crane for operating said movable member.   
     
     
       2. A remote-control assembly in accordance with claim 1, wherein said remote-control box includes a plurality of two-way air valves. 
     
     
       3. A remote-control assembly in accordance with claim 1, wherein said converter box includes a pressure regulator for supplying compressed air to said pressure switches. 
     
     
       4. A remote-control assembly in accordance with claim 1, wherein said plurality of fluid lines is formed of plastic tubes for supplying air. 
     
     
       5. A remote-control assembly in accordance with claim 4, wherein said plurality of plastic tubes is housed in a common plastic hose. 
     
     
       6. A remote-control assembly in accordance with claim 1, further including an electric plug connected to said plurality of electric lines adapted to be plugged into said electrical control circuit. .Iadd. 7. A remote-control assembly for controlling a crane or the like having a movable member, wherein said crane includes an electrical control circuit for controlling said movable member, comprising: a remote-control box including a plurality of fluid valves and means for operating said fluid valves;   a converter box including a plurality of pressure switches;   each of said pressure switches including movable means having an electrical contact;   each of said pressure switches being formed by a separate housing for enclosing said movable means and said electrical contact;   a plurality of fluid lines connecting said fluid valves to operate the movable means in each of said pressure switches; and   a plurality of electric lines connecting the electrical contacts of said pressure switches to said electrical control circuit on said crane for operating said movable member. .Iaddend. .Iadd. 8. A remote-control assembly for controlling a crane or the like having a movable member, wherein said crane includes an electrical control circuit for controlling said movable member, comprising:   a remote-control box including a plurality of fluid valves and means for operating said fluid valves;   a converter box including a plurality of pressure switches;   each of said pressure switches including an electrical contact switch having movable means activated by air pressure;   each of said pressure switches being formed by a separate housing for enclosing said electrical contact switch;   a plurality of fluid lines connecting said fluid valves to operate the movable means in each of said pressure switches; and   a plurality of electric lines connecting the electrical contacts of said pressure switches to said electrical control circuit on said crane for operating said movable member.