Abstract: Disclosed herein is an exercise machine using a ball. The exercise machine includes a stand. A fastening bracket is secured to the stand and has on an upper portion thereof a first external threaded part. A coil spring engages at a lower portion thereof with the first external threaded part. A connecting bracket includes a second external threaded part which is provided on a lower portion thereof and engages with an upper portion of the coil spring, and a third external threaded part which is provided on an upper portion thereof. A ball includes a core and a cover formed of a plurality of panel segments. An internal bracket is secured to an inner circumferential surface of the core, and has a first internal threaded part which engages with the third external threaded part.

Abstract: An apparatus for locking roof racks and cross bars of a roof carrier realizes easy production and reduction in production costs through structural simplification. The apparatus comprises a pair of roof racks, in an inner surface of each of which a plurality of fixing holes is formed at regular intervals; at least two cross bars, each of which is coupled with the roof racks at opposite ends thereof in the widthwise direction of the vehicle; a pair of fixing members, which are located at opposite ends of the cross bar and are detachably coupled to the fixing holes in the roof racks; operating means, which are coupled to the opposite ends of the cross bar so as to couple and uncouple each fixing member to and from each fixing hole; and a connecting means, which connects the fixing members so as to interact with the fixing members in the cross bar.