Hydraulic double-cut tube cutoff

An apparatus for cutting a workpiece moving in a predetermined path relative to a support, said apparatus comprising:

• a carriage;
• means for mounting the carriage to a support for movement relative to a support to follow movement of a workpiece moving in a predetermined path;
• and
• clamping means on the carriage for clamping a workpiece to the carriage,
• said clamping means having an open position and a closed position;
• first means on the carriage for selectively applying an actuating force;
• means for transmitting an actuating force from the first means to the clamping means for urging the clamping means to the closed position, and
• primary means for maintaining the clamping means in the closed position in the absence of an actuating force being applied by the first means.

An apparatus for cutting a workpiece, said apparatus comprising:

• a frame;
• clamping means on the frame for clamping a workpiece to the frame,
• said clamping means having an open position and a closed position;
• first means on the frame movable between a first position and a second position for making a scarf cut in a workpiece;
• and
• means for moving the clamping means from its open position to its closed position as an incident of the first means moving from its first position towards its second position.

An apparatus for cutting a workpiece, said apparatus comprising:

• a frame;
• clamping means on the frame for clamping a workpiece to the frame, said clamping means having an open position and a closed position;
• first means on the frame for selectively applying an actuating force, said first means including means for making a cut in a workpiece clamped by the clamping means;
• means for transmitting an actuating force from the first means to the clamping means for selectively both urging the clamping means to the closed position and moving the clamping means from the closed position to the open position;
• and
• primary means for maintaining the clamping means in the closed position in the absence of an actuating force being applied by the first means.

An apparatus for cutting a workpiece, said apparatus comprising:

• a frame;
• clamping means on the frame for clamping a workpiece to the frame,
• said clamping means having an open position and a closed position;
• first means on the frame for selectively applying an actuating force;
• means for transmitting an actuating force from the first means to the clamping means for urging the clamping means to the closed position;
• primary means for maintaining the clamping means in the closed position in the absence of an actuating force being applied by the first means;
• and
• secondary means for maintaining the clamping means in a closed position in the absence of an actuating force being applied by the first means.

An apparatus for cutting a workpiece, said apparatus comprising:

• a frame;
• clamping means on the frame for clamping the workpiece to the frame, said clamping means having an open position and a closed position;
• first means on the frame for selectively applying an actuating force;
• means for transmitting an actuating force from the first means to the clamping means for urging the clamping means to the closed position, the transmitting means comprising a slider-crank mechanism;
• and
• primary means for maintaining the clamping means in the closed position in the absence of an actuating force being applied by the first means.

An apparatus for cutting a workpiece, said apparatus comprising:

• a frame;
• and
• clamping means on the frame for clamping a workpiece to the frame, said clamping means having an open position and a closed position;
• first means on the frame for selectively applying an actuating force;
• means for transmitting an actuating force from the first means to the clamping means for urging the clamping means to the closed position and for moving the clamping means from the closed position to the open position;
• and
• primary means for maintaining the clamping means in the closed position in the absence of an actuating force being applied by the first means,
• the primary maintaining means comprising a locking link selectively engageable with the transmitting means to maintain the clamping means in the closed position.