Abstract: An apparatus and method for securing a top panel cover of a mattress to an innerspring core include a plurality of clips attached to an upper border wire of the core. Each clip has one or more barbs that project inwardly with respect to the core. The cover is attached to the core by stretching and wrapping the edges of the cover over and around the border wire and pushing the edges against the barbs so that the barbs pierce the edges and hold the edges in a taut position at least partially wrapped around the border wire.

Abstract: An apparatus and method for securing a top panel cover of a mattress to an innerspring core include a plurality of clips attached to an upper border wire of the core. Each clip has one or more barbs that project inwardly with respect to the core. The cover is attached to the core by stretching and wrapping the edges of the cover over and around the border wire and pushing the edges against the barbs so that the barbs pierce the edges and hold the edges in a taut position at least partially wrapped around the border wire.

Abstract: The apparatus includes a sample-holder comprising a tube (16) of thin aluminum, and a piston (12) slidable in the tube. The piston is mounted on a solid, robust piston rod (14). To drive the apparatus down to the depth at which the sample is to be taken, the piston and tube are locked together, and travel down in unison, most of the force of the hammer blows being taken by the robust piston rod. When sampling depth is reached, the piston rod (14) is uncoupled, and the piston (12) is restrained by means of a cable (36) to the surface; further hammering now drives only the tube (16) downwards, not the piston. The tube being thin, the drive force is must less, whereby the tube does not collapse, as the sample enters the tube.