Radial release device
A release device having a multi-segment split spool with a central bore adapted to axially restrain a tensioned member. A tensioned tape is overlappingly wound around the spool segments thereby preventing radial movement of the spool segments. The overlapping winding allows for a low profile housing for the release device. The multiple segments require less radial motion for release of the tensioned member.
1. A release apparatus for controlling the deployment of a device by restraining or releasing a first releasable member under tension in a first direction, which respectively prevents or allows the deployment of the device, the release apparatus comprising:
a first releasable member, the first releasable member comprising an expanded portion at a first end;
a housing;
a plurality of spool segments, the spool segments adapted to restrain the first releasable member along the first direction while the plurality of spool segments are in a first constrained position by contact of the first releasable member with a first side of the spool segments, the spool segments contained within the housing, the spool segments narrowing to an exterior pivoting contact surface on a second side of the spool segments, the exterior pivoting contact surface in contact with an inner surface of the housing; and
a restraining tape wound around the plurality of spool segments, wherein the restraining tape comprises a plurality of layers completely wound around the plurality of spool segments and wherein the plurality of layers completely wound around the plurality of spool segments are in contact with another layer for the entire circumference of the winding,
wherein:
the spool segments are adapted to pivot radially outward from the first releasable member and about a rotational axis resulting from pivoting contact between the exterior pivoting contact surface and the inner surface of the housing,
the spool segments are adapted to pivot radially outward from the first releasable member upon release from the first constrained position when the first releasable member is under tension along the first direction, and
the spool segments are supported in a direction parallel to the first direction by the contact between the exterior pivoting contact surface and the inner surface of the housing.
2. The release apparatus of claim 1 wherein a first end of the restraining tape is releasably attached to a release device.
3. A release apparatus for controlling the deployment of a device by restraining or releasing a first member under tension which respectively prevents or allows the deployment of the device, the apparatus comprising:
a first releasable member, the first releasable member comprising an expanded portion at a first end;
a segmented spool portion, the segmented spool portion adapted to restrain the first releasable member along a first direction while the spool segments are in a first constrained position, the segmented spool portion comprising three or more pieces; and
a restraining tape wound around the plurality of spool segments, the restraining tape having a first end attached to the segmented spool portion and a second end releasably attached to a release device,
wherein the segmented spool portion consists of three of more segments, and wherein the restraining tape comprises a plurality of layers completely wound around the plurality of spool segments, and wherein the plurality of layers completely wound around the plurality of spool segments are in frictional contact with another layer for the entire circumference of the winding and wherein the restraining tension in the restraining tape is reduced along the tape in a direction from the first end of the restraining tape to the second end of the restraining tape due to friction between the tape layers.
4. The release apparatus of claim 3 further comprising:
a housing; and
one or more anti-rotation pins, the anti-rotation pins affixed to the housing between the plurality of spool segments, the anti-rotation pins adapted to restrict rotary motion of the plurality of spool segments relative to the housing.
5. The release apparatus of claim 4 wherein the release device comprises a pivoting arm, wherein a first end of the pivoting arm is releasably attached to the second end of the restraining tape, and wherein a second end of the pivoting arm is releasably attached to an electrically activated fuse.
6. The release apparatus of claim 3 wherein the release device comprises an electrically actuated fuse.