Robert Boschgmbh

Steinbock Gmbh

Rudolf Hansen

Dieter Kipp

Herbert Aman

An armrest adjacent the seating surface for the operator of a fork lift truck or like moving machine has a top face elongated in a predominantly horizontal direction. A low and narrow, elongated side wall projects from the top face adjacent the operator so as to be normally received between the operator's body and lower arm and elbow and to secure the operator. Control elements for the machine are mounted on the front portion of the top face for operation by the fingers of an arm resting on the top face.

Arm rest for the operator's seat on a moving machine

Variable pulsing of a dc source without change of polarity is used for lossless control of the speed of a compound dc motor. The pulsed dc supply is fed in series through the series field winding, armature and reversing switch system and the shunt field winding has one terminal connected to the pulsed dc source and its other terminal connected respectively through two conductively poled diodes to the opposite terminals of the armature winding. Two anti-kickback devices are also provided, one of which operates during reverse-current braking. The reversing switch system has two independently actuatable single-pole double-throw switches of which the respective arm contacts are connected to the ends of the armature winding, one fixed contact of each of these reversing switches being connected to the series field winding and the other pair, likewise connected together, being connected to one terminal of the dc supply. Whenever the reversing switches are connected to fixed contacts that are connected together, the motor is turned off and the pulsing control SCR is necessarily extinguished. To turn the motor on, one of the reversing switches is thrown, the one selected determining the direction of operation of the motor to produce braking or to reverse the direction of operation, both reversing switches are thrown simultaneously. To stop energization of the motor, one of them is thrown.

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Freising, Germany

Rudolf Hansen