R 408.12425 Slide counterbalance systems.

Rule 2425. (1) Spring counterbalance systems, when used, shall incorporate means to retain system parts in event of breakage. (2) Spring counterbalances, when used, shall have the capability to hold the slide and its attachments at mid-stroke, without brake applied. (3) An air counterbalance cylinder shall have all of the following: (a) Incorporate means to retain the piston and rod in case of breakage or loosening. (b) Have adequate capability to hold the slide and its attachments at any point in stroke, without brake applied. (c) Incorporate means to prevent failure of capability (sudden loss of pressure) in event of air supply failure.