Versatile Joyce Machine Screw Jacks lift and precisely position all kinds of loads from 250 lbs. to 250 tons. Upright or inverted, these precision jacks operate at full capacity whether the load is in tension or compression. WJ series single lead jacks are self locking under full lifting capacity, while DWJ double lead series jacks offer increased travel speed. Heat treated alloy steel worm shafts, aluminum/bronze worm gears and tapered roller or ball bearings provide rugged reliability.
Double extended worm shafts are standard. Joyce screw jacks come in translating screw, rotating screw (keyed for traveling nut) and keyed designs. All screw jack designs can be fitted with a protective boot. Jacks are available with one of four standard screw ends or special ends to meet your requirements.
An optional anti-backlash feature compensates for thread wear, assuring minimum play between lifting screw and worm gear for smooth, precise operation. Jacks equipped with the antibacklash feature are rated at full capacity under static conditions. For jack capacity under dynamic conditions please contact Joyce/Dayton.
Joyce/Dayton will custom design jacks to meet special requirements.
