(under subclass 50) Apparatus in which the means sensitive to the pressure on the material causes the actuating means to reverse the direction of movement of the movable platen upon the achievement of a predetermined pressure in the material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
256, for reciprocating platen presses in which the movement of the movable platen trips a stop or trips a trigger to cause the press to reverse.
260+, for reciprocating platen presses with actuation releasing for rebounding or biased return.
266, for reciprocating platen presses having a spring or weight return bias.
SEE OR SEARCH CLASS
408, Cutting by Use of Rotating Axially Moving Tool,
8+, for drilling machines with feeding means and having automatic control such that on the occurrence of a predetermined condition during relative movement of the tool and work in the approach direction there is brought into operation a control means which reverses the direction of the relative movement of the tool and work to withdraw the tool from work.