Tube extracting mechanism

A tube extracting mechanism comprising:

• an elongated frame defining an opening in the front end thereof and a longitudinally extending passageway in communication with the opening;
• a sleeve positioned in the passageway and slidably supported by the frame for longitudinal movement within the passageway in a first direction towards the opening and in a second direction away from the opening;
• expandable jaw means supported by the sleeve for longitudinal movement therewith, wherein the jaw means is movable through the opening;
• expansion means in communication with the expandable jaw means for expanding the jaw means, wherein longitudinal movement of the expansion means in the first direction expands the jaw means;
• expansion power means including a first longitudinally reciprocable hydraulic cylinder for imparting longitudinal movement in the first direction to the expansion means;
• pulling power means including a second longitudinally reciprocable hydraulic cylinder connected to the frame for imparting longitudinal movement in the second direction to the sleeve and expandable jaw means;
• a source of pressurized hydraulic fluid;
• a hydraulic fluid circuit connecting the first and second hydraulic cylinders to the source of pressurized fluid, including,
• a circuit control valve having an advance position for directing pressurized fluid to the first and second hydraulic cylinders to extend the cylinders, and a neutral position for preventing pressurized fluid from flowing to the cylinders,
• an expansion cylinder control valve having an open position allowing pressurized fluid to flow to the first hydraulic cylinder to extend the cylinder, and a closed position preventing pressurized fluid from flowing to the first cylinder, and
• a pulling cylinder control valve having an open position allowing pressurized fluid to flow to the second hydraulic cylinder to extend the cylinder, and a closed position for preventing pressurized fluid from flowing to the second cylinder;
• and
• control means including,
• first means to move the circuit control valve to
• the advance position, second means to move the expansion cylinder control valve to the closed position, and third means to move the pulling cylinder control valve to the open position.

A tube extracting mechanism comprising:

• an elongated frame defining an opening in the front end thereof and a longitudinally extending passageway in communication with the opening;
• a sleeve positioned in the passageway and slidably supported by the frame for longitudinal movement within the passageway in a first direction towards the opening and in a second direction away from the opening;
• expandable jaw means supported by the sleeve for longitudinal movement therewith, wherein the jaw means is movable through the opening and including a plurality of annularly and radially extending gripping teeth, wherein each tooth includes
• an annularly extending central section having a gripping edge generally defining an arc for engaging the inside surface of a tube, and
• a pair of tapered end sections wherein each end section annularly extends from the central section and includes a tapered edge, wherein the tapered edges radially taper inward to facilitate withdrawing the jaw means from the tube;
• expansion means in communication with the expandable jaw means for expanding the jaw means, wherein longitudinal movement of the expansion means in the first direction expands the jaw means;
• expansion power means for imparting longitudinal movement in the first direction to the expansion means;
• and
• pulling power means connected to the frame for imparting longitudinal movement in the second direction to the sleeve and expandable jaw means.

A tube extracting mechanism comprising:

• an elongated frame;
• expandable jaw means supported by the frame for longitudinal movement relative to the frame and including a plurality of annularly and radially extending teeth wherein each tooth includes
• an annularly extending central section having a gripping edge generally defining an arc for engaging the inside surface of a tube,
• and
• a pair of end sections wherein each end section annularly extends from the central section and includes a tapered edge, wherein the tapered edges radially taper inward to facilitate withdrawing the jaw means from the tube;
• expansion means in communication with the expandable jaw means wherein longitudinal movement of the expansion means expands the jaw means;
• and
• power means supported by the frame for imparting longitudinal movement to the jaw means and the expansion means.

Jaw means for gripping a tube comprising:

• a longitudinally extending and radially expandable body;
• and
• a plurality of teeth extending annularly about and radially outward from the body, wherein each tooth includes
• an annularly extending central section having a gripping edge generally defining an arc for engaging the interior surface of the tube, and
• a pair of end sections wherein each end section annularly extends from the central section and includes a tapered edge, wherein the tapered edges radially taper inward toward the body to facilitate withdrawing the jaw means from the tube.