Apparatus for releasably securing a load to a structure
A load, such as a pallet, is releasably secured to a fixed structure, e.g. a cargo bay of a space shuttle. The pallet ( 5 ) is secured to a support ( 2 ), which holds the pallet and is secured in the cargo bay. A first interlocking device (ID 1 ) is provided at each end of the support. A second interlocking device (ID 2 ) is provided at each end of the pallet. The first interlocking device (ID 1 ) includes a shaft ( 1 ) rotatably held in a shaft mounting bracket ( 3 A) secured to a respective support end ( 3 ). The second interlocking device (ID 2 ) includes a bracket ( 4 ) secured to an end of the pallet ( 5 ), a claw ( 4 A) secured to the bracket, a groove in the claw ( 4 A) and a fork ( 6 ) in the groove of the claw ( 4 A). A central shaft section ( 1 A) is received in the fork ( 6 ) for the interlocking. The shaft ( 1 ) is movable in the fork ( 6 ) in the direction of the x-axis and of the z-axis. The shaft is also rotatable about the x-axis and tiltable relative to the y-axis. The fork is turnable about the z-axis. These motions are possible in the locked state due to the construction of the interlocking devices (ID 1 and ID 2 ). In the unlocked state, jamming and even seizing are avoided or minimized by increasing play.
1. An apparatus for releasably securing a load to a fixed structure, said fixed structure defining a three dimensional coordinate system with axes x, y, z, said apparatus comprising a load support ( 2 ) mountable to said fixed structure, said load support ( 2 ) having two ends ( 3 ) between which said load ( 5 ) is held, two first interlocking devices (ID 1 ) one of which is secured to each end ( 3 ) of said load support ( 2 ), two second interlocking devices (ID 2 ) one of which is secured to each of two opposite ends of said load ( 5 ) for cooperation with a respective first interlocking device (ID 1 ), each locking device of said two first interlocking devices (ID 1 ) comprising a shaft mounting bracket ( 3 A) connected to a respective end ( 3 ) of said load support ( 2 ), and a locking shaft ( 1 ) having a length axis (x) operatively mounted in said shaft mounting bracket ( 3 A), each locking device of said two second interlocking devices (ID 2 ) comprising a claw mounting bracket ( 4 ), a claw ( 4 A) secured to said claw mounting bracket ( 4 ), a groove in said claw ( 4 A), a fork ( 6 ) operatively mounted in said claw ( 4 A), adjustment means for adjusting the position of said locking shaft ( 1 ) and said fork ( 6 ) relative to each other for providing play between said shaft ( 1 ) and said fork ( 6 ) for facilitating inserting said locking shaft ( 1 ) into said fork ( 6 ) and for a removal of said locking shaft ( 1 ) from said fork ( 6 ), said adjustment means permitting eliminating said play for releasably interlocking said first and second interlocking devices (ID 1 , ID 2 ) with each other.
2. The apparatus of claim 1 , wherein said adjustment means comprise first adjustment elements ( 1 D, 1 E, 1 F) cooperating with said locking shaft ( 1 ) in said shaft mounting bracket ( 3 A) for increasing said play between said locking shaft ( 1 ) and said fork ( 6 ), said adjustment means further comprising second adjustment elements ( 6 A, 6 B, 17 ) cooperating with said fork ( 6 ) in said claw ( 4 A) for turning said fork ( 6 ) within limits of said play.
3. The apparatus of claim 2 , wherein said first adjustment elements have a released position in which said locking shaft ( 1 ) is movable in the direction of said x- and y-axes, turnable about said x-axis and tiltable relative to said y-axis, wherein said first adjustment elements have a locked position in which said locking shaft ( 1 ) is fixed, wherein said second adjustment elements have a released position in which said fork ( 6 ) is turnable about said z-axis and wherein said second adjustment elements have a locked position in which said fork ( 6 ) is fixed.
4. The apparatus of claim 1 , further comprising at least one ejector spring ( 11 ) operatively interposed between said support ( 2 ) and said claw mounting bracket ( 4 ), said at least one ejector spring bearing against said claw mounting bracket ( 4 ) with a biasing force tending to move said claw ( 4 A) away from said locking shaft ( 1 ) for removing said load from said support ( 2 ).
5. The apparatus of claim 4 , further comprising a core ( 12 ) on which said at least one ejector spring ( 11 ) is wound.
6. The apparatus of claim 1 , wherein said support ( 2 ) is a keel yoke assembly comprising an elastically deformable structure.
7. The apparatus of claim 1 , wherein said shaft mounting bracket ( 3 A) secured to said support ( 2 ) comprises at least one ramp section (R 1 , R 2 ) for contacting said claw mounting bracket ( 4 ) secured to said load ( 5 ), for facilitating an insertion of said load ( 5 ) into said support ( 2 ).
8. The apparatus of claim 1 , wherein said shaft mounting bracket ( 3 A) comprises two interconnected side boards (SB), each side board having an edge (E) facing said claw mounting bracket ( 4 ), and wherein each edge (E) facing said claw mounting bracket ( 4 ) comprises at least one ramp section for contacting said claw mounting bracket ( 4 ).
9. The apparatus of claim 8 , wherein each edge (E) facing said claw mounting bracket ( 4 ) comprises two ramp sections (R 1 , R 2 ) with different ramp slopes.
10. The apparatus of claim 9 , wherein a first ramp section (R 1 ) has a larger ramp slope than a second ramp section (R 2 ) of said two ramp sections (R 1 , R 2 ) along said edges (E).
11. The apparatus of claim 1 , wherein said fork ( 6 ) has two fork legs ( 6 ′, 6 ″) fitting into said groove of said claw ( 4 A), said fork legs having beveled edges with first bevels ( 13 , 14 ), said groove of said claw ( 4 ) having second bevels (B 1 , B 2 ) merging into said first bevels ( 13 , 14 ) thereby forming a guide channel for guiding said locking shaft ( 11 ) into said fork ( 6 ).
12. The apparatus of claim 1 , wherein said locking shaft ( 1 ) has a central shaft section ( 1 A) between two mounting portions ( 1 B) wherein said adjustment means comprise tool engageable adjustment elements for turning said locking shaft ( 1 ) about its length axis (x), and wherein said central shaft section ( 1 A) has a flattened configuration with a crosssection having a large diameter (LD) and a small diameter (SD).
13. The apparatus of claim 12 , wherein said locking shaft ( 1 ) is rotatably mounted in said shaft mounting bracket ( 3 A) for aligning said large diameter (LD) with said z-axis to facilitate an insertion of said central shaft section ( 1 A) into said fork ( 6 ) and to then align said large diameter (LD) of said central shaft section ( 1 A) with said y-axis for locking said locking shaft ( 1 ) in said fork ( 6 ).
14. The apparatus of claim 1 , wherein said adjustment means comprise a fork mounting screw including a threaded bolt ( 6 A) and a nut ( 17 ) holding said fork ( 6 ) in said groove of said claw ( 4 A) by said bolt, said nut on said bolt permitting an adjustment of said fork ( 6 ) by loosening said nut ( 17 ) and turning said bolt ( 6 A) and fork ( 6 ) in said groove within a limit of said play, and to facilitate removal of said locking shaft ( 1 ) from said fork ( 6 ) when said nut ( 17 ) is removed from said bolt ( 6 A), said nut ( 17 ) permitting locking said bolt ( 6 A) in an adjusted position when the nut ( 17 ) is tightened.
15. The apparatus of claim 14 , wherein said adjustment screw with its bolt ( 6 A) normally extends in the direction of said z-axis.
16. The apparatus of claim 1 , further comprising optical elements ( 15 , 16 ) positioned for providing alignment signals indicating a correct position of said load ( 5 ) in said support ( 2 ).
17. The apparatus of claim 16 , wherein said optical elements ( 15 ) are mounted to said load ( 5 ), and said optical elements ( 16 ) are mounted to said support ( 2 ).
18. The apparatus of claim 17 , wherein said optical elements are adjustably mounted.
19. The apparatus of claim 1 , wherein said shaft mounting bracket ( 3 A) comprises two interconnected side boards (SB) spaced from each other, two mounting blocks (MB) secured between said two side boards for mounting said locking shaft ( 1 ) to said shaft mounting bracket so that a central section ( 1 A) of said locking shaft ( 1 ) extends between said two mounting blocks (MB), and a lock (L, L 1 ) including a cam (C) positioned in said shaft mounting bracket ( 3 A), said cam (C) moving in response to an operation of said lock (L, L 1 ).
20. The apparatus of claim 19 , wherein said shaft mounting bracket ( 3 A) comprises an opening between said interconnected side boards (SB), and wherein said lock (L, L 1 ) is operatively mounted in said opening for latching said cam (C) against said central section ( 1 A) of said locking shaft ( 1 ), when said central section ( 1 A) is in a locking position.