Abstract: A bollard assembly is formed from a bollard that resides in a tubular socket. The socket has an internal core that is separated from the tube walls by annular recess. The lower end of the bollard is received within the recess. Lifting elements inside the bollard engage the upper surface of the core, and are internally biased in favor of extension. A locking system prevents extension of the lifting elements. When the locking system is unlocked, the pressure of the lifting elements against the core causes the bollard to rise out of and slightly above the socket, without external assistance. Once raised, the bollard may easily be removed from the site of the socket.

Abstract: A golf swing training device comprising an illuminator mounted on the shaft of a golf club and a detector assembly including a light sensor strategically located around the stomach region of the golfer. The illuminator provides a relatively narrow beam of light wave energy, preferably along an axis that is generally coincident with the longitudinal axis of the club. The illuminator may be pulse modulated, to provide a frequency encoded light output. The detector assembly detects the light output from the illuminator, and produces a buzzing sound or a vibrating sensation, to alert the golfer that the club is following a correct path and position through the golf swing. The detector assembly may include optical filtering and signal conditioning to reduce the effects of ambient light. With such sensory feedback, the golfer develops muscle training for a consistent and correct swing pattern.