Abstract: A rotatable spring biased clamp for mounting on the platform of a bicycle rack pivots about the perpendicularly extending lugs ends of its legs. Each leg end is emgaged with a torsion spring that provides both a rotational force to the clamp, to hold objects on the platform, and a vertically bias on the lug ends, to hold them in place against the platform of a bicycle rack during use. The legs are elastically deformable toward each other, and coil type torsion springs have hook shaped tangs; the clamp is thus easily mounted on or removed from a rack platform without tools.

Abstract: A rack for transporting things on a bicycle is configured for storing a shackle lock during use of the bicycle. The rack, which mounts above the rear wheel of a bicycle, has a horizontal platform with a nominal C-shaped cross section comprised of a top having downwardly extending and inwardly curving arms. The shackle of a lock is slidably insertable into the C-shape; the curved arms permit shackles of varying diameter and leg spacing to be stored. Outwardly deflectable arms, or leaf springs captured in lengthwise undercut grooves within the C-shape, press on the shackle to frictionally retain it. The rear end of the platform is angled so that when a shackle lock cross bar contacts it there is a downward force on the cross bar, to stop vertical shaking of the lock. The horizontal stays that hold the platform to the bicycle are slidably adjustable and locked in position by means of set screw cams in grooves running adjacent the grooves receiving the stays.

Abstract: Two layers of flexible material, each of which is resistant to the passage of fluids and microbes, include spacers between them, and are hermetically sealed, for maintaining reduced atmospheric pressure in the space between them. Open cell foam supported in the space is compressed by the layers until one of the layers is torn, upon which the resulting increase in atmospheric pressure in the space allows the foam to resile, increasing the space between the layers as a warning to the user of the break. An electric switch which is responsive to pressure change is in communication with the space to also signal a warning of the break.