Negator spring tool for paratroop door

A method for winding a negator spring output drum having a plurality of radial spokes around a pulley shaft which extends through a center of the negator spring output drum along a rotational axis, the method comprising:

• releasably attaching a drum-facing side of a tool disk to the negator spring output drum, the tool disk having an outer edge which is generally circular except for a cutout forming a portion of the outer edge as a cutout edge portion of the outer edge, the drum-facing side including a plurality of protruding teeth arranged circumferentially and protruding from the drum-facing side to engage the radial spokes when the protruding teeth are pushed into an interior of the negator spring output drum and the tool disk is rotated in either circumferential direction around the rotational axis extending through the center of the negator spring output drum and a center of the tool disk, the outer edge of the tool disk including a plurality of handle slots which are spaced circumferentially along the outer edge;
• releasably inserting a distal end of a first tool handle into a first handle slot of the tool disk and using the first tool handle to rotate the tool disk and the negator spring output drum in a circumferential direction around the rotational axis;
• releasably inserting a distal end of a second tool handle into a second handle slot of the tool disk;
• removing the distal end of the first tool handle from the first handle slot of the tool disk;
• and
• using the second tool handle to rotate the tool disk and the negator spring output drum in the circumferential direction around the rotational axis;
• releasably attaching the drum-facing side of the tool disk to the negator spring output drum comprising pushing the protruding teeth of the tool disk into the interior of the negator spring output drum and rotating the tool disk in either circumferential direction around the rotational axis, the protruding teeth of the tool disk each have a T-shaped cross section to engage the radial spokes when pushed into the interior of the negator spring output drum and rotated in either circumferential direction around the rotational axis, each T-shaped protruding tooth and the drum-facing side forming an I-shaped cross section having two opposite facing U-shaped cavities on two opposite sides of the I-shaped cross section to receive the radial spokes when the protruding teeth are pushed into the interior of the negator spring output drum.

A negator spring tool for winding a negator spring output drum having a plurality of radial spokes around a pulley shaft which extends through a center of the negator spring output drum along a rotational axis, the negator spring tool comprising:

• a pair of tool handles, each tool handle having a distal end;
• a tool disk having an outer edge which is generally circular except for a cutout forming a portion of the outer edge as a cutout edge portion of the outer edge, the outer edge of the tool disk including a plurality of handle slots which are spaced circumferentially along the outer edge, the rotational axis extending through a center of the tool disk;
• and
• a mechanism for releasably attaching a drum-facing side of the tool disk to the negator spring output drum, the mechanism comprising a plurality of protruding teeth arranged circumferentially and protruding from the drum-facing side to engage the radial spokes when the protruding teeth are pushed into an interior of the negator spring output drum and the tool disk is rotated in either circumferential direction around the rotational axis extending through the center of the negator spring output drum and a center of the tool disk, the protruding teeth of the tool disk each having a T-shaped cross section to engage the radial spokes when the protruding teeth are pushed into the interior of the negator spring output drum in a direction along the rotational axis and the tool disk is rotated in either circumferential direction around the rotational axis, each T-shaped protruding tooth and the drum-facing side forming an I-shaped cross section having two opposite facing U-shaped cavities on two opposite sides of the I-shaped cross section to receive the radial spokes when the protruding teeth are pushed into the interior of the negator spring output drum;
• the distal end of each tool handle being insertable into any of the handle slots of the tool disk to rotate the tool disk in a circumferential direction around the rotational axis.