Abstract: A clamping device for locking articles onto the bar of a car top carrier, wherein the clamping device has a base member, a lever arm and a pair of links. The links are pivotally attached at opposite ends thereof respectively to the base and lever arm with the pivots spaced apart from one another and arranged so as to lock in an over-center article clamp down position. An article engaging member is secured to one of the link arms and projects therefrom beyond the lever arm adjacent one end of the same and a finger operable lever lock means is pivotally attached to the lever arm at the other end thereof and engageable with the other link for locking the lever arm in an article securing position. The base member and lever arm are channel-shaped members internested one within the other in an article locking position and have aligned apertures in such position for receiving a padlock to make the unit burglar proof.

Abstract: An extension for a common trolley type service jack that includes an elongate rigid frame with a tunnel extending inwardly from one end thereof to receive the jacking end portion of the trolley type service jack. The rigid frame bears downwardly on the frame of the service jack adjacent the entry to the tunnel and inwardly thereof are supports for the wheels of the trolley jack. A lift platform is attached to the rigid frame by a lever pivotally attached at one end to the lift platform and at the other end to the rigid frame and overly the tunnel. The lever extends beyond the tunnel and on the free outer end is mounted the lift platform, the lever being pivotally movable by the lift portion of the jack to raise the lift platform of the jack extension.