Abstract: An EMF detecting safety shovel has electromagnetic field (EMF) detection circuitry operably coupled to a blade thereof for measuring changes in EMF over time (AC fields) which may be used by spotters during excavation work for detection of subsurface power supply cables. The safety shovel may be further configured for classifying different types of subsurface power cables wherein the EMF detector circuit may be configured for discriminating between low and high voltage subsurface power cables when the edge of the blade is within a certain distance thereof, and the EMF detector circuit may be adjusted to adjust the distance for use with differing conduit diameters. The EMF detector circuit may also employ bandpass filtering to discriminate between single and three phase power supplies. In this way, the present safety shovel may provide indication of the presence of subsurface power supply cables and also the type thereof.

Abstract: An EMF detecting safety shovel has electromagnetic field (EMF) detection circuitry operably coupled to a blade thereof for measuring changes in EMF over time (AC fields) which may be used by spotters during excavation work for detection of subsurface power supply cables. The safety shovel may be further configured for classifying different types of subsurface power cables wherein the EMF detector circuit may be configured for discriminating between low and high voltage subsurface power cables when the edge of the blade is within a certain distance thereof, and the EMF detector circuit may be adjusted to adjust the distance for use with differing conduit diameters. The EMF detector circuit may also employ bandpass filtering to discriminate between single and three phase power supplies. In this way, the present safety shovel may provide indication of the presence of subsurface power supply cables and also the type thereof.

Abstract: A bellows type seal for a quick connect coupling. The bellows seal has a torroidal portion (20) with a substantially planar sealing surface at one end of the torroidal portion (20) and a bellows portion (14) at the other end of the torroidal portion (20). The bellows portion (14) extends away from the torroidal portion (20) and is semicircular in cross-section and terminates in a circumferential bead (24) extending radially outward from the bellows portion (14). The bellows portion (14) may also include a circumferential sealing bead (26) at an apex of the bellows portion (14). The torroidal portion (20) may have a metal reinforcement ring (22). The termination bead (24) of the bellows portion (14) has a part circular cross-section with a diameter greater than that of the thickness of the bellows portion (14).