Abstract: A pressure vessel in the form of a hydro-pneumatic flexible bladder accumulator is provided which includes a shell formed of a cylindrical tube. An open-ended thimble-shaped deformable bladder of resilient material is positioned within the shell. A port plate is attached to one end of the tube, and a closure cap is retained in the other end of the tube. The cap may be retained in the other end of the tube, for example, by a removable locking ring. The closure cap has an inner end which may be displaced radially inwardly from the inner surface of the shell, and it has three axially spaced peripheral grooves on the inner end which respectively receive an O-ring to prevent leakage of liquid out of the accumulator, and two integral beads that surround the mouth of the bladder. One of the integral beads of the bladder has the shape of an O-ring, and it is received in one of the grooves to form an effective seal for the interior of the bladder.

Abstract: A cut-off machine includes a housing having a top surface with an elongated slot therethrough. A rotatable cutting disc is mounted within the housing for raising and lowering movement through the slot to cut workpieces supported on the top surface. Elevating means is selectively operable for moving the cutting disc in raising and lowering directions. Clamp means on the top surface clamps workpieces thereagainst for cutting by the disc. A cover moves between open and closed positions for selectively covering the clamp means and the top surface in outwardly-spaced relationship thereto. Slot blocking means beneath the top surface moves between blocking and unblocking positions for selectively blocking movement of the disc upwardly through the slot. Selective operation of control means for the elevating means is also dependent upon safety control means operated by all of the cover, clamp means and slot blocking means.