Screw element extractor

An apparatus for extracting a plurality of screw elements from a screw shaft, the screw elements being slid over the screw shaft from a downstream end thereof and held in place against a stop provided at an upstream end thereof, the apparatus comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp a downstream screw element, the stationary clamp being movable between an open position permitting reception of a downstream screw element and a closed position clamping the downstream screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp,
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp an upstream screw element, the movable clamp being movable between an open position permitting reception of an upstream screw element and a closed position clamping the upstream screw element, and
• e) a drive coupled to the carriage for causing motion of the carriage toward and away from the stationary clamp, wherein clamping of a downstream screw element by the stationary clamp, clamping of an upstream screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of the downstream screw element from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft, the screw elements being slid over the screw shaft from a downstream end thereof and held in place against a stop provided at an upstream end thereof, the apparatus comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp a downstream screw element, the stationary clamp being movable between an open position permitting reception of a downstream screw element and a closed position clamping the downstream screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp, and
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp an upstream screw element, the movable clamp being movable between an open position permitting reception of an upstream screw element and a closed position clamping the upstream screw element,
• wherein clamping of a downstream screw element by the stationary clamp, clamping of an upstream screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of the downstream screw element from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft, the screw elements being slid over the screw shaft from a downstream end thereof and held in place against a stop provided at an upstream end thereof, the apparatus comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp an upstream screw element, the stationary clamp being movable between an open position permitting reception of an upstream screw element and a closed position clamping the upstream screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp,
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a downstream screw element, the movable clamp being movable between an open position permitting reception of a downstream screw element and a closed position clamping the downstream screw element,
• e) a first drive coupled to the stationary clamp for opening and closing the stationary clamp,
• f) a second drive coupled to the movable clamp for opening and closing the movable clamp, and
• g) a third drive coupled to the carriage for causing motion of the carriage toward and away from the stationary clamp, wherein clamping of an upstream screw element by the stationary clamp, clamping of a downstream screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of the downstream screw element from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft, the screw elements being slid over the screw shaft from a downstream end thereof and held in place against a stop provided at an upstream end thereof, the apparatus comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp an upstream screw element, the stationary clamp being movable between an open position permitting reception of an upstream screw element and a closed position clamping the upstream screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp,
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a downstream screw element, the movable clamp being movable between an open position permitting reception of a downstream screw element and a closed position clamping the downstream screw element, and
• e) a drive coupled to the carriage for causing motion of the carriage toward and away from the stationary clamp, wherein clamping of an upstream screw element by the stationary clamp, clamping of a downstream screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of the downstream screw element from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft, the screw elements being slid over the screw shaft from a downstream end thereof and held in place against a stop provided at an upstream end thereof, the apparatus comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp an upstream screw element, the stationary clamp being movable between an open position permitting reception of an upstream screw element and a closed position clamping the upstream screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp, and
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a downstream screw element, the movable clamp being movable between an open position permitting reception of a downstream screw element and a closed position clamping the downstream screw element, and
• wherein clamping of an upstream screw element by the stationary clamp, clamping of a downstream screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of the downstream screw element from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp a first screw element, the stationary clamp being movable between an open position permitting reception of a first screw element and a closed position clamping the first screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp,
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a second screw element, the movable clamp being movable between an open position permitting reception of a second screw element and a closed position clamping the second screw element,
• e) a first drive coupled to the stationary clamp for opening and closing the stationary clamp,
• f) a second drive coupled to the movable clamp for opening and closing the movable clamp, and
• g) a third drive coupled to the carriage for causing motion of the carriage toward and away from the stationary clamp, wherein clamping of a first screw element by the stationary clamp, clamping of a second screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of one of the first and second screw elements from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp a first screw element, the stationary clamp being movable between an open position permitting reception of a first screw element and a closed position clamping the first screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp,
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a second screw element, the movable clamp being movable between an open position permitting reception of a second screw element and a closed position clamping the second screw element, and
• e) a drive coupled to the carriage for causing motion of the carriage toward and away from the stationary clamp, wherein clamping of a first screw element by the stationary clamp, clamping of a second screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of one of the first and second screw elements from the screw shaft.

An apparatus for extracting a plurality of screw elements from a screw shaft comprising:

• a) a frame,
• b) a stationary clamp mounted on the frame and configured to clamp a first screw element, the stationary clamp being movable between an open position permitting reception of a first screw element and a closed position clamping the first screw element,
• c) a carriage mounted on the frame for motion toward and away from the stationary clamp, and
• d) a movable clamp mounted on the carriage for motion therewith and configured to clamp a second screw element, the movable clamp being movable between an open position permitting reception of a second screw element and a closed position clamping the second screw element,
• wherein clamping of a first screw element by the stationary clamp, clamping of a second screw element by the movable clamp and one or more strokes of the carriage away from the stationary clamp result in removal of one of the first and second screw elements from the screw shaft.