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: Disclosed herein is an apparatus, having a simple structure, for locking a cross bar to side bars of a roof carrier. In the present invention, the side bars are provided at opposite sides on a roof panel of a vehicle in the longitudinal direction of the vehicle. A plurality of locking holes is formed in the inner surface of each side bar at regular intervals. The cross bar is coupled at opposite ends thereof to respective side bars in a lateral direction of the vehicle so as to be movable in a longitudinal direction of the side bars. The locking apparatus includes a pair of locking members, which are removably inserted into the locking holes of the respective side bars, a wire, which is provided in the cross bar to couple the locking members to each other, and a spacing device, which bends the wire and thus removes the locking members from the side bars. As such, the present invention has a simple structure using the wire, thus reducing production costs and simplifying the manufacturing process.

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.