ROEMHELD Swing Clamps – Threaded Cartridge, Single Acting, B1.891 (2 Series)

ROEMHELD Power Workholding

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Product Information

7250 psi max

Single Acting

Swing Clamps utilize a sturdy helical-cam mechanism to swing the clamping arm clear for unrestricted loading. The threaded-cartridge Swing Clamps shown here provide considerable clamping force in a small size, because they can operate at a full 7250 psi with any standard clamping arm. These Swing Clamps incorporate our unique safety-clutch mechanism. If the clamping arm strikes an unexpected object during its swing, the clutch disengages to avoid damaging the object or the clamp's helical-cam mechanism. Clamping arm can be mounted to start its 90° swing from any position within 360°. Threaded-cartridge Swing Clamps are designed specifically for space-saving manifold mounting.

Available in one clamp size, single acting (shown here) and double acting (see Related Products below), with a choice of clockwise, counterclockwise, or zero° swing. Available with 45° and 60° swing angles by special order. The single-acting version has a slightly longer body due to the return-spring mechanism. Clamping force at 7250 psi for single-acting clamps with a standard clamping arm:

830 lbs (2 series)

Application Information

Manifold mounting allows placing these swing clamps very close together.

When clamping over a work support, these swing clamps are ideally matched with small threaded-body work supports (1500 lbs load capacity at 7500 psi). The design rule in such applications is that work-support load capacity should be at least 2X clamping force.

This fixture has three workpieces held by nine swing clamps with short clamping arms. Short arms extend only .16" onto the workpiece, but are ideal for some small parts.

Documents

B1.891

Data Sheet

Clamping Action

Diagram showcasing the application of Roemheld Swing Clamps Threaded Cartridge Single Acting B1891 2 Series

Available with clockwise, counterclockwise, or zero° swing

Swing Clamps are pull-type cylinders where part of the total stroke is used to swing the piston, and the remaining stroke is available as the clamping range. Applying fluid pressure swings arm 90° over workpiece then clamps down. Single-acting version has a fast, totally dependable spring return that lifts arm then swings it back 90° for loading/unloading. Optional fluid return (double acting).

Design Considerations

These Swing Clamps incorporate our unique safety-clutch mechanism. If the clamping arm strikes an unexpected object during its swing, the clutch disengages to avoid damaging the object or the clamp's helical-cam mechanism. Do not exceed maximum fluid flow rate in table. For extended clamp life and proper operation of the safety clutch, a simple flow-control valve may be required if the fixture is powered by a high-flow-rate power source and only contains a few clamps. Clamping time should be at least one second.

Mounting & Fluid Supply

Screw clamp into fixture up to the body hex. Threaded-cartridge clamps have O-ring seals on their outside diameter, so they require a precision mounting hole. Carefully follow hole-preparation instructions in the drawings. Round the sharp edge on the upper fluid passage with a 3/16" dia ball as shown in Detail Z of the drawings (otherwise the lower O-ring can be damaged when the clamp is screwed in). Check for burrs with finger before installing. Fluid passages must be drilled exactly as shown in the drawings. Do not use NPT fittings.

Clamping Arm

Standard Clamping Arm

7250 psi max

Gooseneck Clamping Arm

5000 psi max

Short Clamping Arm

7250 psi max

Order clamping arm separately. Standard Clamping Arms can be used at pressures up to 7250 psi on these clamps.

Material

Piston > Alloy steel, nitrated for wear and corrosion resistance. Housing > Mild steel, nitrated for wear and corrosion resistance. Piston rod wiper > Viton.

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