GOVERNMENT CONTRACT

[0001] The Government of the United States of America has rights in this invention pursuant to a U.S. Government contract.

BACKGROUND

Field

[0002] This disclosure relates generally to a reusable release mechanism and, more particularly, to a reusable release mechanism for releasably securing a releasable structure to a stationary structure, where the mechanism employs slidable release balls that can re-secure the releasable structure to the stationary structure.

Discussion of the Related Art

[0003] Various applications, for example, spacecraft applications, require a releasable joint mechanism, such as a non-explosive actuator (NEA), where typically a bolt having a head is secured to a releasable structure and is releasably mounted to a stationary structure. In one known design, the bolt extends through a bore in the stationary structure, where the head of the bolt is prevented from passing through the bore by a three-piece split washer. A wire is wrapped around the washer to hold the pieces together, where the wire is under compression, and a fusible link holds the wire in compression. A current is applied to the link to melt it and release the wire, which causes the pieces of the washer to separate and allow the head of the bolt to pass through the bore under a certain force, such as a spring force or gravity, thus releasing the releasable structure from the stationary structure. However, in this and other similar designs, once the releasable structure is released, the joint is not reusable for re-securing the releasable structure to the stationary structure.

[0004] There may be various applications for joint mechanisms of the type discussed above where it is desirable to reuse the joint mechanism in a manner that allows the releasable structure to be re-secured to the stationary structure, for example, to save cost, the mechanism may not be accessible, and other benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a side view illustration of a release joint assembly showing a releasable structure being releasably secured to a stationary structure by a reusable release mechanism;

[0006] Figure 2 is an exploded side view illustration of the release joint assembly shown in figure 1 and illustrating the releasable structure being released from the stationary structure;

[0007] Figure 3 is an isometric view of a reusable release mechanism of the type shown in figure 1 ;

[0008] Figure 4 is a cross-sectional view of the reusable release mechanism shown in figure 3 in a latched state;

[0009] Figure 5 is a cross-sectional view of the reusable release mechanism shown in figure 3 in an un-latched state;

[0010] Figure 6 is a top view of a base portion separated from the reusable release mechanism shown in figure 3 illustrating release balls in the latched state;

[0011] Figure 7 is a top view of the base portion separated from the reusable release mechanism shown in figure 3 illustrating the release balls in the un-latched state;

[0012] Figure 8 is a bottom view of a rotating portion separated from the reusable release mechanism shown in figure 3 illustrating the release balls in the latched state; and

[0013] Figure 9 is a bottom view of the rotating portion separated from the reusable release mechanism shown in figure 3 illustrating the release balls in the un-latched state.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following discussion of the embodiments of the disclosure directed to a reusable release mechanism for releasably securing a releasable structure to a stationary structure, where the mechanism employs slidable release balls that can re-secure the releasable structure to the stationary structure is merely exemplary in nature, and is in no way intended to limit the disclosure or its applications or uses. [0015] Figure 1 is a side view illustration of a release joint assembly 10 showing a simplified reusable release mechanism 12 for releasably securing a releasable structure 14 to a stationary structure 16. The release joint assembly 10 includes a bolt 18 having a bolt shaft 20 extending through a bore 22 in the structure 16 and being secured to the stationary structure 16, where the bolt 18 includes a bolt head 24 having an angular collar 26, and where the diameter of the bolt head 24 allows it to slide through the bore 22. The mechanism 12 includes a wall structure 28 that pushes release balls 30 towards the shaft 20 and in contact with the collar 26 to prevent the bolt 18 from sliding through the bore 22 and releasing the structure 14. Moving the wall structure 28 away from the release balls 30 allows the release balls 30 to move away from the bolt 18 and allows the bolt 18 to slide through the bore 22 and release the releasable structure 14 from the stationary structure 16, as shown in figure 2.

[0016] Figure 3 is an isometric view of reusable release mechanism 40, figure 4 is a cross-sectional view of the release mechanism 40 in a latched state, where three release balls 42 are shown positioned proximate a bolt 44 having a collar 46 as referred to above, and figure 5 is a cross- sectional view of the release mechanism 40 in an un-latched state, where the release balls 42 are shown positioned away from the bolt 44 as also referred to above. The mechanism 40 includes a base portion 50 and a circular rotatable portion 52 secured to the base portion 50 by a plate 54 bolted to the base portion 50 by bolts 56, where the rotatable portion 52 extends through a circular opening 58 in the plate 54. A nut 60 extends from a top of the rotatable portion 52 and has an opening 62 through which the bolt 44 can extend, where the nut 60 provides a mechanism for rotating the rotatable portion 52 by, for example, a wrench (not shown). The base portion 50 includes a central bore 64 in axial alignment with the opening 62 that also allows the bolt 44 to extend therethrough. The base portion 50 also includes flanges 66 that allow the mechanism 40 to be secured, here bolted, to the stationary structure, where the stationary structure and the release structure are not shown in figures 3, 4 and [0017] Figure 6 is a top view of the base portion 50 separated from the reusable release mechanism 40 illustrating the release balls 42 in the latched state, and figure 7 is a top view of the base portion 50 separated from the reusable release mechanism 40 illustrating the release balls 42 in the un latched state. The base portion 50 includes three channels or rails 70 that radially extend outward from the bore 64 at 120° apart from each other that have a size so that the release balls 42 are able to set into and roll along the rails 70 in unison with each other. When the release balls 42 are pushed to an inside end of the rails 70 at a center of the base portion 50 proximate the central bore 64, the release balls 42 engage the collar 46 and the mechanism 40 is in the latched position, and when the release balls 42 are positioned an outside end of the rails 70 away from the center of the base portion 50, the release balls 42 disengage the collar 46 and the mechanism 40 is in the un-latched position.

[0018] Figure 8 is a bottom view of the rotatable portion 52 separated from the reusable release mechanism 40 illustrating the release balls 42 in the latched state, and figure 9 is a bottom view of the rotatable portion 52 separated from the reusable release mechanism 40 illustrating the release balls 42 in the un-latched state. The rotatable portion 52 includes a cam indentation 72 formed in its bottom surface and including three pockets 74 spaced 120° apart from each other and three radii surfaces 76 therebetween, as shown. When the rotatable portion 52 is secured to the base portion 50 so that the release balls 42 are positioned adjacent to and in contact with the surfaces 76 and the balls 42 are at the center end of the rails 70 proximate to the bolt 44 and in contact with the collar 46, the releasable structure is secured to the stationary structure. When the rotatable portion 52 is rotated 120° relative to the base portion 50, such as clockwise, the pockets 74 will be lined up with the rails 70 and the balls 42 are allowed to move outward along the rails 70 by, for example, the force of the collar 46 pushing on the balls 42 towards the pockets 74, which releases the bolt 44, and thus the releasable structure from the stationary structure. If the bolt 44 can be repositioned in the mechanism 40, the rotatable portion 52 can be rotated 120° in the same or an opposite direction, where the cam indentation 72 pushes the release balls 42 along the rails 70 back towards the center bore 64, which will latch the balls 42 to the collar 46. Therefore, the release mechanism 40 can be reused to connect and disconnect the releasable structure to and from the stationary structure.

[0019] If the rotatable portion 52 was continually rotated in one direction, the release balls 42 would be caused to move inward and allowed to move outward along the rails 70 as the rotatable portion 52 rotates. In order to limit the rotation of the rotatable portion 52 and provide a mechanism for locking the rotatable portion 52 in the latched and/or unlatched position, the release mechanism 40 includes a stop block 82 that is secured to the base portion 50 by a pull pin 84 inserted into an orifice 78 and the rotating portion 52 includes a tab 80. When the rotatable portion 52 rotates, the tab 80 will engage the stop block 82 and hold the rotatable portion 52 so that the release balls 42 are locked or held in the latched or unlatched position.

[0020] The foregoing discussion discloses and describes merely exemplary embodiments of the present disclosure. One skilled in the art will readily recognize from such discussion and from the accompanying drawings and claims that various changes, modifications and variations can be made therein without departing from the spirit and scope of the disclosure as defined in the following claims.