Joint and clamp band system for releasably connecting space craft elements
The disclosure concerns a joint ( 1 ) for releasably connecting a first space craft element ( 2 ) to a second space craft element ( 3 ) comprising a first flange ( 4 ) on the first space craft element ( 2 ) and a second flange ( 5 ) on the second space craft element ( 3 ). The joint ( 1 ) comprises first shoe portions ( 6 ) and second shoe portions ( 13 ) formed as sectors of a solid of revolution, keeping the flanges ( 4, 5 ) together in a longitudinal direction, The shoe portions are positioned next to each other in a circumferential direction the reference to a longitudinal direction of the space crafts. The first shoe portions being arranged to, at a prevailing Coulomb friction, not allow self-locking and the second show portions are arranged to allow self-locking.
1. A joint for releasably connecting a first space craft element to a second space craft element, comprising a first flange on the first space craft element and a second flange on the second space craft element, which joint comprises first shoe portions formed as sectors of a solid of revolution keeping the flanges together, which first shoe portions are surrounded by a peripherally arranged, tensioning and releasing means acting in a radial direction, the first flange comprising first sectors having first flange surfaces sloping outwards, towards a reference plane being perpendicular to a longitudinal direction of the space craft elements, forming a first angle with the reference plane, the second flange comprising corresponding first sectors having second flange surfaces sloping outwards, towards the reference plane, forming a second angle with the reference plane, the first shoe portions being formed with a first lower surface of revolution corresponding to the first flange surfaces and a first upper surface of revolution corresponding to the second flange surfaces, the first and second angles and being so chosen that with an increasing longitudinal force trying to separate the first and second flanges, at a prevailing Coulomb friction, self-locking cannot occur between the first lower surface of revolution and the first flange surfaces and between the first upper surface of revolution and the second flange surfaces;
characterized in that the joint comprises second shoe portions formed as sectors of a solid of revolution, keeping the flanges, together in a longitudinal direction, being perpendicular to the radial direction, which second shoe portions are surrounded by the peripherally arranged, radially acting tensioning and releasing means, the first flange comprising second sectors having third flange surfaces, forming a third angle with the reference plane, the second flange comprising corresponding second sectors having fourth flange surfaces, forming a fourth angle with the reference plane, the second shoe portions being formed with a second lower surface of revolution corresponding to the third flange surfaces and a second upper surface of revolution corresponding to the fourth flange surfaces,
where the third angle and the fourth angle being zero degrees or being chosen so that with an increasing longitudinal force trying to separate the first and second flanges, at a prevailing Coulomb friction, self-locking will occur between the second lower surface of revolution and the third flange surface and between the second upper surface of revolution and the fourth flange surface, wherein in the second sectors there is a first distance between the second lower surface of revolution and the third flange surface and a second distance between the second upper surface of revolution and the fourth flange surface upon contact between the first and second flanges in the contact plane.
2. A joint according to claim 1 , characterized in that the first lower surface of revolution and the first upper surface of revolution in the first shoe portions are radially dimensioned and arranged so that with an increasing longitudinal force form-locking contact is obtained substantially simultaneously between the first lower surface of revolution and the first flange surfaces and the first upper surface of revolution and the second flange surfaces.
3. Joint according to any one of claim 1 , characterized in that the first shoe portion provides a constant pressure to the first and second flanges during connection.
4. A joint according to claim 1 , characterized in that the first shoe portions and the second shoe portions are positioned next to each other such that every second shoe portion being first shoe portions and second shoe portions respectively.
5. A joint according to claim 1 , characterized in that the first and second shoe portions are positioned within one shoe unit.
6. A joint according to claim 5 , characterized in that the second shoe portions are positioned within the center of the shoe unit.
7. A joint according to claim 1 , characterized in that the first and second flanges are substantially circular.
8. A joint according to claim 1 , characterized in that the contact plane between the flanges coincide with the reference plane or that the contact plane is arranged at an angle to the reference plane.
9. A clamp band system for releasably connecting a first space craft element to a second space craft element;
characterized in that the clamp band system comprises a tensioning and releasing means, first shoe portions and second shoe portions, according to claim 1 , wherein the first shoe portions are formed with a first lower surface of revolution and a first upper surface of revolution, and the second shoe portions being formed with a second lower surface of revolution and a second upper surface of revolution.
10. A clamp band system according to claim 9 , characterized in that the first lower surface of revolution has a first angle and the first upper surface of revolution has a second angle, the second lower surface of revolution has a third angle and the second upper surface of revolution has a fourth angle, where the first angle and the second angle are larger than the third angle and the fourth angle, and where the angles are related to a plane that is corresponding to the reference plane during use.
11. A clamp band system according to claim 10 , characterized in that the third angle and the fourth angle are both zero degrees.
12. Joint according to any one of claim 2 , characterized in that the first shoe portion provides a constant pressure to the first and second flanges during connection.
13. A joint according to any one of claim 2 , characterized in that the first shoe portions and the second shoe portions are positioned next to each other such that every second shoe portion being first shoe portions and second shoe portions respectively.
14. A joint according to any one of claim 2 , characterized in that the first and second shoe portions are positioned within one shoe unit.
15. A joint according to any one of claim 3 , characterized in that the first shoe portions and the second shoe portions are positioned next to each other such that every second shoe portion being first shoe portions and second shoe portions respectively.
16. A joint according to any one of claim 3 , characterized in that the first and second shoe portions are positioned within one shoe unit.
17. A joint according to claim 2 , characterized in that the first and second flanges are substantially circular.
18. A joint according to claim 2 , characterized in that the contact plane between the flanges coincide with the reference plane or that the contact plane is arranged at an angle to the reference plane.
19. A joint according to claim 3 , characterized in that the first and second flanges are substantially circular.
20. A joint according to claim 3 , characterized in that the contact plane between the flanges coincide with the reference plane or that the contact plane is arranged at an angle to the reference plane.