Abstract: A knockdown aluminum-made floorboard which is integrally formed by way of aluminum extrusion. The aluminum-made floorboard has a hollow main body. Two sides of the main body are respectively formed with a projecting plate and two wing plates continuously extending in lengthwise direction. The projecting plate and wing plates oppositely outward protrude. A front end of the projecting plate is formed with projections. A front end of each wing plate is formed with a stop section for fixedly engaging with the projection of the projecting plate of an adjacent floorboard.

Abstract: A roller skate has a sole plate having a front oblong hole, a rear oblong hole, and a middle block. The sole plate has a round aperture, a threaded hole, and a circular aperture. The middle block has a round hole and a through hole. The hollow bottom casing has a front slot, a rear slot, and a bore. The first wheel support seat has a first U-shaped frame, and a first insertion plate having a first circular hole. The second wheel support seat has a second U-shaped frame, and a second insertion plate having a second circular hole. The through hole, of the middle block receives the first insertion plate and the second insertion plate. The first shaft is inserted through the round aperture and the first circular hole. The second shaft is inserted through the circular aperture and the second circular hole. The positioning tube engages with the threaded hole. The blocking device is inserted through the round hole.