초록 ▼

A gantry crane has first and second side support frames spaced by a pair of trolley beams. A load lifting mechanism is connected to the trolley beams and includes a lift frame for engaging a load to be lifted. An operator cab is mounted on the first side support frame and is vertically moveable betw

A gantry crane has first and second side support frames spaced by a pair of trolley beams. A load lifting mechanism is connected to the trolley beams and includes a lift frame for engaging a load to be lifted. An operator cab is mounted on the first side support frame and is vertically moveable between a lowermost position and an uppermost position in an operational plane defined by the first side support frame. A cab lift cable has a length and a first end fixed to the operator cab and a second end fixed to the side support frame. A hydraulic cylinder urges the cable between its fixed first and second ends in a direction transverse to a portion of its length. In another embodiment of the invention, an operator cab is adapted to be horizontally moveable. The elevating operator cab of the present invention can be configured to move horizontally. The elevating operator cab is lifted by a carriage beam vertically moveable along vertical legs of the first side support frame. The operator cab is moveable horizontally along the carriage beam.

대표청구항 ▼

We claim: 1. A gantry crane comprising: first and second side support frames spaced by at least one beam; a load lifting mechanism operable to support a load between said first and second side support frames, the load lifting mechanism and the first and second side support frames defining an operat

We claim: 1. A gantry crane comprising: first and second side support frames spaced by at least one beam; a load lifting mechanism operable to support a load between said first and second side support frames, the load lifting mechanism and the first and second side support frames defining an operating area there between; and an operator cab including controls for moving the load lifting mechanism, wherein the operator cab is selectively moveable either horizontally or vertically in an operational plane defined by the first side support frame tangent to the operating area. 2. The gantry crane of claim 1, wherein the first side support frame includes at least two vertical legs, an upper side beam and a lower side beam, wherein the upper and lower side beams extend between the vertical legs. 3. The gantry crane of claim 2, wherein the operational plane is defined by the vertical legs, upper side beam and the lower side beam. 4. The gantry crane of claim 1, further comprising a generally horizontal carriage beam disposed within the operational plane and vertically movable, and wherein the operator cab is movably connected to the carriage beam. 5. The gantry crane of claim 4, wherein the first side support frame includes at least two vertical support rails, and wherein the carriage beam is guided vertically along the rails. 6. The gantry crane of claim 4, further comprising a trolley mounted to move horizontally along the carriage beam, and wherein the operator cab is mounted to the trolley. 7. The gantry crane of claim 4, further comprising means for moving the operator cab horizontally along the carriage beam. 8. The gantry crane of claim 4, further comprising means for vertically moving the carriage beam with respect to the first side support frame. 9. A gantry crane comprising: first and second side support frames spaced by at least one beam; a load lifting mechanism operable to support a load between said first and second side support frames; and an operator cab comprising a door to provide access into an interior of the operator cab, a latch that automatically prevents the door from opening when the operator cab is moved vertically from the lower most position, and controls for moving the load lifting mechanism, wherein the operator cab is selectively moveable either horizontally or vertically in an operational plane defined by the first side support frame. 10. The gantry crane of claim 9, wherein the latch comprises a shaft rotatably mounted to an outside portion of the operator cab, the shaft having an arm on an end of the shaft which, when the shaft rotates, the arm moves to a position across the access door when the operator cab is vertically moved from the lower-most position preventing the access door from being opened. 11. A gantry crane comprising: a first side support frame having two vertical legs connected by an upper side beam and a lower side beam, the lower side beam having a downwardly-extending portion defining a lowermost position; a second side support frame having two vertical legs connected to at least one side beam; at least one beam spacing the first and second side support frames; a load lifting mechanism operable to support a load between said first and second side support frames; and an operator cab that is vertically moveable generally between the lower side beam and upper side beam of the first side support frame and horizontally movable generally between the two vertical legs of the first side support frame. 12. The gantry crane of claim 11, further comprising a generally horizontal carriage beam disposed generally between the vertical legs of the first side support frame, the operator cab being movably connected to the carriage beam, wherein the carriage beam is vertically movable relative to the legs. 13. The gantry crane of claim 12, further comprising at least two vertical support rails, each of the rails being disposed along a respective one of the legs, wherein opposite ends of the carriage beam are guided vertically along the rails. 14. The gantry crane of claim 11, further comprising a trolley mounted to move horizontally along the carriage beam, and wherein the operator cab is mounted to the trolley. 15. A gantry crane comprising: a first and second support frames, each said support frame including a pair of vertical legs; at least one beam extending between the first and second support frames, the one beam and the first and second support frames defining an operating area there between; a load lifting mechanism operable to support a load between said first and second support frames; and an operator cab including controls for moving the load lifting mechanism, wherein the operator cab is horizontally and vertically movable in a plane defined tangent to the operating area by two of the vertical legs. 16. A gantry crane comprising: a frame including multiple vertical legs, the frame defining an operating area between said multiple vertical legs; a load lifting mechanism operable to support a load from the frame; an operator cab adapted to move relative to the frame and outside of the operating area, the operator cab including controls for moving the load lifting mechanism; means for vertically moving the operator cab relative to the frame; and means for horizontally moving the operator cab relative to the frame. 17. A gantry crane comprising: first and second side support frames spaced by at least one beam; a load lifting mechanism operable to support a load between said first and second side support frames, the load lifting mechanism and the first and second side support frames defining an operating area there between; an operator cab that is selectively moveable either horizontally or vertically in an operational plane defined by the first side support frame tangent to the operating area; and wherein the first side support frame includes at least two vertical support rails, and wherein a carriage beam connected to the operator cab is guided vertically along the rails. 18. A gantry crane comprising: first and second side support frames spaced by at least one beam; a load lifting mechanism operable to support a load between said first and second side support frames; and an operator cab that is selectively moveable either horizontally or vertically in an operational plane defined by the first side support frame, wherein the operator cab comprises a door to provide access into an interior of the operator cab, and a latch that automatically prevents the door from opening when the operator cab is moved vertically from a lower-most position. 19. The gantry crane of claim 18, wherein the latch comprises a shaft rotatably mounted to an outside portion of the operator cab, the shaft having an arm on an end of the shaft which, when the shaft rotates, the arm moves to a position across the access door when the operator cab is vertically moved from the lower-most position preventing the access door from being opened. 20. The gantry crane of claim 1, wherein operator cab includes controls for maneuvering the gantry crane.