PURPOSE: To easily change and adjust the slope of a skiing ground by laying mats which possesses elasticity and flexibility in the lower part of a slope and allowing the mat to include a plurality of vacant parts and allowing each of the vacant part to be filled with bead shaped fillers and connecting a mechanism for discharging the fillers.
CONSTITUTION: When a selector valve 30 of a mechanism 20 connected with a bead bag (vacant part) 18 which exists directly under a prescribed position of a slope G is turned to the I-side, the pressurized oil is supplied into a hydraulic cylinder piston 24, and pistons 24a and 22a rise, and the inside of a bead bag 26 is filled with filling material, i.e., beads B. Accordingly, the bead bag (vacant part) 18 expands, and the slope part in the upper part rises. Further, when the selector valve 30 of the mechanism 20 is turned to the O-side, the pressurized oil is discharged from the hydraulic cylinder piston 24, the pistons 24a and 22a lower, and the beads B are discharged into the bead piston 22 from the vacant part 18. Then, the bead vacant part 18 contracts, and a layer 12 in the upper part and the slope G part are made flat or recessed.
MURAKAMI FUMIYOSHI
KAWANISHI YUTAKA
YANAI HIROSHI
| JPS62270181A | 1987-11-24 | |||
| JPS6239721B2 | 1987-08-25 | |||
| JPS54704A | 1979-01-06 |