Abstract: A belt retractor for a safety belt, having a belt reel for winding or unwinding the safety belt, and a belt force limiting installation which comprises a first and second torsion bar for limiting belt force. The belt retractor has a free-wheeling transmission which operates depending on the rotation angle and which after activation of the belt force limiting installation initially leaves the second torsion bar so as to be inactive, while the first torsion bar for limiting belt force is already being twisted, and the free-wheeling transmission activates the second torsion bar as soon as the free-wheeling transmission has been rotated about a predefined maximum free-wheeling rotation angle.

Abstract: There is provided refrigeration system (1) and method for remote cooling of a thermal load having a first portion (27) and a second portion (25). The system comprises a cold source (4) having a first cooling stage (5) and a second cooling stage (6), the temperature of the first cooling stage being higher than the temperature of the second cooling stage. The system also comprises a cryogen circuit for circulation of a cryogen flow in a closed cycle, the closed cycle being thermally coupled to the cold source. The system further comprises a compressor (7) for compressing and circulating the cryogen flow in the cryogen circuit.

Abstract: A belt retractor for a safety belt, having a belt reel for winding or unwinding the safety belt, and a belt force limiting installation which comprises a first and second torsion bar for limiting belt force. The belt retractor has a free-wheeling transmission Which operates depending on the rotation angle and which after activation of the belt force limiting installation initially leaves the second torsion bar so as to be inactive, while the first torsion bar for limiting belt force is already being twisted, and the free-wheeling transmission activates the second torsion bar as soon as the free-wheeling transmission has been rotated about a predefined maximum free-wheeling rotation angle.

Abstract: A pump (10) for circulating a cryogenic coolant, comprising: a cylinder housing (14); a piston (16) received in said cylinder housing (14) for reciprocating in said cylinder housing (14) between a first death center position (18) and a second death center position (20), said first death center position (18) and said second death center position (20) defining a compression chamber (22) therebetween; an outlet (34) for said compression chamber (22); and an inlet (36) formed in a wall (24) of said cylinder housing (14) at a position between said first death center position (18) and said second death center position (20); wherein said inlet (36) is adapted to establish a fluid connection between said compression chamber (22) and a coolant reservoir (40; 76).

Abstract: Transmission-reception equipment for a bus system and for handling access collision of subscriber stations connected dc-free in a bus system preferably constructed with a shielded twisted-pair cable. The transmission-reception equipment of the subscriber stations at their transmission sides, has a difference bus transmitter unlocked for only a fraction of a bit time span and thereby outputting a difference voltage pulse of one the other operational sign but placed in a quiescent condition in the remaining part of every bit time span. At the reception side of the subscriber stations, two difference bus receivers are connected to the bus signal conductors, oppositely in comparison to one another, and a bi-stable RS flip-flop has its inputs connected to outputs of the difference bus receivers.

Abstract: Transmission-reception equipment for a bus system guarantees a reliable response of all bus receivers in a bus system preferably constructed with a shielded twisted-pair cable and having a greater length and/or higher bit rate than prior art systems. The stations are coupled to the bus system via a repeater having a primary winding and a secondary winding having the same number of turns. Two bus transmitters are connected parallel to one another and are respectively connected to the primary winding halves separated by a resistor. The bus reception equipment is connected to a series circuit of the two primary winding halves, whereas the secondary winding is connected to the signal conductors of the bus system. A voltage doubling achieved in the transmission direction is thereby not cancelled in the reception direction.