Field Unit of Game Machine

Abstract

The invention provides a field unit of a game machine, wherein a lower-stage running surface on which a self-running body is placed can be maintained efficiently. The field unit of a game machine includes a lower-stage running surface on which a self-running body runs; and an upper-stage running surface on which a model following up the self-running body runs. In the field unit of a game machine, the lower-stage running surface is formed in a lower structure, and the upper-stage running surface is formed in an upper structure which is liftably combined with the lower structure. The upper structure is raised and lowered with a lift drive device.

1 . A field unit of a game machine, comprising:
 a lower-stage running surface on which a self-running body runs;   an upper-stage running surface on which a model following up the self-running body runs;   a lower structure in which the lower-stage running surface is formed;   an upper structure liftably combined with the lower structure, in the upper structure the upper-stage running surface being formed; and   a lift drive device which raises and lowers the upper structure.   
   
   
       2 . The field unit according to  claim 1 , wherein
 a power-supply surface facing the lower-stage running surface is formed in the upper structure, and   the range of downward move of the upper structure is set such that the self-running body contacts with the power-supply surface when the upper structure is lowered.   
   
   
       3 . The field unit according to  claim 1 , wherein
 the range of upward move of the upper structure is set so as to generate a space which at least an upper body of an operator can enter between the lower-stage running surface and the power-supply surface when the upper structure is raised.   
   
   
       4 . The field unit according to  claim 1 , wherein the lift drive device comprises:
 a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and   an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       5 . The field unit according to  claim 1 , wherein
 the lift drive devices comprises a plurality of hydraulic cylinders separately arranged around the field unit, and   each of the lift drive devices comprises: a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       6 . The field unit according to  claim 5 , wherein
 the lower structure and the upper structure are respectively divided into sub-units of a same number, and   the hydraulic cylinder is provided to each of the sub-units.   
   
   
       7 . The field unit according to  claim 5 , wherein
 a cylinder tube of the hydraulic cylinder is attached to one of the lower structure and the upper structure, and   a piston rod of the hydraulic cylinder is coupled to the other structure through an adjusting device providing end play to the other structure.   
   
   
       8 . The field unit according to  claim 2 , wherein
 the range of upward move of the upper structure is set so as to generate a space which at least an upper body of an operator can enter between the lower-stage running surface and the power-supply surface when the upper structure is raised.   
   
   
       9 . The field unit according to  claim 8 , wherein the lift drive device comprises:
 a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and   an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       10 . The field unit according to  claim 8 , wherein
 the lift drive devices comprises a plurality of hydraulic cylinders separately arranged around the field unit, and   each of the lift drive devices comprises: a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       11 . The field unit according to  claim 10 , wherein
 the lower structure and the upper structure are respectively divided into sub-units of a same number, and   the hydraulic cylinder is provided to each of the sub-units.   
   
   
       12 . The field unit according to  claim 11 , wherein
 a cylinder tube of the hydraulic cylinder is attached to one of the lower structure and the upper structure, and   a piston rod of the hydraulic cylinder is coupled to the other structure through an adjusting device providing end play to the other structure.   
   
   
       13 . The field unit according to  claim 10 , wherein
 a cylinder tube of the hydraulic cylinder is attached to one of the lower structure and the upper structure, and   a piston rod of the hydraulic cylinder is coupled to the other structure through an adjusting device providing end play to the other structure.   
   
   
       14 . The field unit according to  claim 2 , wherein the lift drive device comprises:
 a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and   an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       15 . The field unit according to  claim 3 , wherein the lift drive device comprises:
 a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and   an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       16 . The field unit according to  claim 2 , wherein
 the lift drive devices comprises a plurality of hydraulic cylinders separately arranged around the field unit, and   each of the lift drive devices comprises: a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       17 . The field unit according to  claim 16 , wherein
 the lower structure and the upper structure are respectively divided into sub-units of a same number, and   the hydraulic cylinder is provided to each of the sub-units.   
   
   
       18 . The field unit according to  claim 16 , wherein
 a cylinder tube of the hydraulic cylinder is attached to one of the lower structure and the upper structure, and   a piston rod of the hydraulic cylinder is coupled to the other structure through an adjusting device providing end play to the other structure.   
   
   
       19 . The field unit according to  claim 3 , wherein
 the lift drive devices comprises a plurality of hydraulic cylinders separately arranged around the field unit, and   each of the lift drive devices comprises: a hydraulic cylinder attached between the lower structure and the upper structure such that the working direction of the hydraulic cylinder is vertically oriented; and an oil pressure generating device which supplies oil pressure to the hydraulic cylinder.   
   
   
       20 . The field unit according to  claim 19 , wherein
 the lower structure and the upper structure are respectively divided into sub-units of a same number, and   the hydraulic cylinder is provided to each of the sub-units.