Safety system for e.g. automatic machines - have one member moved from position set by second member by force exceeding set level and moved within distance limited by third member

摘要

A safety system for machinery etc, has at least one member which is moved by another member when a force exceeds an adjustable given value; it has at least one static member to set the starting position of the moving member and at least one force-transmitting member to act on the two other members; the system also has means of limiting movement to a set amt. In an example a cylinder (1) has a partition (2) dividing it into two parts, each with a rod (5,6) fitted with flange (7,8) and pressure spring (9.10). One spring (9) is fixed to the partition (2); the other (10) is fixed to the other end (4) of the cylinder. The springs thus set the initial positions of the rods (5,6). If a force above a set level acts on the LHS end of the rod (5) this (5) moves and compresses the spring (9). A tension applied to the rod (6) moves the cylinder (1) to the left. The effect is that a force above a particular level moves the left hand or right hand half of the system and hence changes the distance between the ends of the two rods (5) and (6). ADVANTAGE - the system detects overloads in a reliable manner and releases them until the system is not endangered and then stops the whole layout.