Abstract: A captive screw for securing together two panels has a screw and a spring extending between the screw head and a ferrule. A collar is formed on the screw shank under the ferrule to limit penetration of the screw threads in a bottom panel so that the upper panel floats on the spring.

Abstract: A telescopic captive fastener has a knob, a ferrule, a spring, and at least one sleeve. The sleeve extends telescopically between the ferrule and the knob.

Abstract: A captive shoulder nut assembly, to hold a heat sink onto a PC board, has a nut member with a threaded portion and a tubular portion extending therefrom. The nut member mates with an upstanding threaded stud. A biasing compression spring rides over the nut with an end coil loop secured to the nut. The nut's tubular portion is suitable for insertion through a straight hole in the heat sink, with the spring remaining above the hole and operating against the heat sink. The free end of the tubular portion can be flared to a larger diameter than the hole, thereby captivating it to the heat sink and permitting movement by the nut through the hole while acting against the spring force. A stop shoulder on the nut and a projecting shoulder on the stud define the length travel of the nut onto the stud and establishes a pre-load compression force on the spring. A self-centering structure included for the nut to engage the stud.

Abstract: A captive shoulder nut for a electronic module heat sink has a threaded nut portion and a tubular portion extending therefrom. A ramped section in the exterior wall of the tubular portion leads to a retaining groove adjacent the bottom face of the nut portion. A compression spring is slipped over the tubular portion to ride over the ramped section and be retained at one end in the retaining groove. The tubular portion is suitable to be inserted through a straight hole, whereof the inner diameter of the spring is larger than the hole. The free end of the tubular portion is suitable to be flared to a larger diameter than the hole, thereby establishing a captivation.

Abstract: A captive screw including a screw and a ferrule is disclosed. One end of the ferrule is adapted for engagement to a hole in a panel to be secured by the captive screw. The screw has an annular flange that is captured within the bore of the ferrule. The screw has a shaft with a threaded portion. The threaded portion of the screw shaft can be made to extend from the ferrule to varying amounts as the screw is moved relative to the ferrule between extended and retracted positions. An optional spring may be provided in the ferrule to bias the screw toward the retracted position.

Abstract: A captive screw including a screw and a ferrule is disclosed. One end of the ferrule is adapted for engagement to a hole in a panel to be secured by the captive screw. The screw has an annular flange that is captured within the bore of the ferrule. The screw has a shaft with a threaded portion. The threaded portion of the screw shaft can be made to extend from the ferrule to varying amounts as the screw is moved relative to the ferrule between extended and retracted positions. An optional spring may be provided in the ferrule to bias the screw toward the retracted position.