Abstract: An electric connector is disclosed to include an electrically insulative housing, the housing having a plurality of terminal slots and a protruded block in each terminal slot near the bottom side, a plurality of U-shaped terminals respectively mounted in the terminal slots in the housing, each terminal having two bonding ends held between two opposite lateral sidewalls of the corresponding terminal slot and two sides of the corresponding protruded block, and a plurality of solder balls located on the bottom side of the housing and supported on the protruded block in each terminal slot and clamped between the bonding ends of each terminal.

Abstract: A slide glass rack for use in a centrifugal apparatus has a slide glass accommodating concave that opens upward, and a flange provided on an upper outer peripheral surface of the rack. A centrifugal apparatus that uses the slide glass rack comprises a rotor, wherein the rotor is formed at a peripheral edge thereof with an inclined face extending upward obliquely with a predetermined angle, the inclined face being formed with a rectangular hole through which a slide glass rack is inserted, the flange of the rack is supported by the peripheral edges of the rectangular hole.

Abstract: A step exerciser includes two pedal rods coupled to two cranks at two sides of the wheel axle of a flywheel for enabling the flywheel to be rotated when the user steps the pedal rods alternatively up and down, and a coupling device is coupled a round rod at one end of each of the cranks and a U-lug at one end of each of the pedal rods, the coupling device having a vertical axle bearing block connected to the U-lug by a screw bolt and a locknut, and a horizontal axle bearing block fixedly connected to the horizontal axle bearing block at right angles and adapted to support the round rod of one of the cranks in the U-lug at one end of one of the pedal rods to reduce friction and noise during operation of the step exerciser.

Abstract: A control unit is disclosed for controlling a refrigerating machine in such a way that a refrigerating power exceeding the required performance is secured while the control unit has a function of bypassing hot gas by means of a hot gas bypass line. A temperature-responsive valve is mounted in the hot gas bypass line in addition to a pressure regulating valve. If a preset temperature Tr of a brine becomes equal to or higher than a given temperature (0° C.), the temperature-responsive valve opens the bypass line. If the preset temperature Tr becomes lower than the given temperature, the temperature-responsive valve closes the bypass line.