Abstract: The present invention relates to a roller skate frame. The roller skate frame includes a plate being pressing molded into a main frame of the roller skate comprising two wheel-mounting plates corresponding to each other, and a front bottom connecting face and a shoe-mounting plate connecting thereto. The front bottom connecting face and the shoe-mounting plate are spaced apart with a suitable distance. Further, the front bottom connecting plate is formed by an upper and a lower bridging plate corresponding to each other, and both of which are positioned with a fastener hole respectively.

Abstract: A four-piston hydraulic brake for bikes comprises a hydraulic cylinder and a brake pad device. Each side of the hydraulic cylinder is set two pistons respectively. An opening is set on one side of the hydraulic cylinder which a space, piston ring grooves 1 and 2 are set thereof. The brake pad device which comprises two brake pads, a spring component and a latch is installed in the space of the hydraulic cylinder. A brake component which several grooves are set thereof is set on one corresponding side of each two brake pad. The spring component is installed between two brake pads. The latch assembles the brake pads and the spring component.

Abstract: The present invention relates to the manufacturing method of an ice skate blade. The blade originally shaped as cylinder is processed by a rolling machine and gradually being rolled into a blade with thinner upper portion and wider lower portion. A plurality of through holes with equi-distance in between are provided on the upper portion of the blade which is curved upward at both ends. Finally, a layer of light and rigid polymeric resin material is provided for covering the upper portion of the blade to complete the blade having upper and lower matching sections.

Abstract: The present invention relates to a roller skate frame. The roller skate frame includes a plate being pressing molded into a main frame of the roller skate comprising two wheel-mounting plates corresponding to each other, and a front bottom connecting face and a shoe-mounting plate connecting thereto. The front bottom connecting face and the shoe-mounting plate are spaced apart with a suitable distance. Further, the front bottom connecting plate is formed by an upper and a lower bridging plate corresponding to each other, and both of which are positioned with a fastener hole respectively.

Abstract: The present invention relates to an ice skate blade holder and blade assembly which comprises a blade holder and a blade, wherein said skate blade holder includes two pin holes respectively located at the bottom of the front and rear aspects of said blade holder. The blade is secured with the blade holder by pins and nuts extending through said pin holes. The blade has an upper and a lower portion which are adhered to each other by glue. The lower portion of the blade provided with great wear-resistant and rigid material has an elongated protrusion extending along upside. The upper portion of the blade provided with lighter aluminum material includes an accommodated slot extending along the bottom thereof and two round slots respectively located at the upper edge thereof.

Abstract: This invention is a structural improvement for an ice skate blade, where the blade holder and the blade are separate. The blade is made from a hard, wear-resistant material. The upper surface is a relatively thinner connecting surface by a roller shape forming machine. On the surface of the blade, there are several equidistant apertures. A special mold is utilized for mounting the connecting surface of the blade to the blade holder using lighter material materials, namely plastic steel. Thus, the weight reduction of the whole ice skate blade effectively improves the skaters' technique and performance and enhances market competitiveness as well.