1. An elongate channel for housing electronic equipment under the floor of an aircraft cabin, the floor having removable floor panels mounted with fasteners to flanges of transverse floor beams and longitudinal floor joists, the channel comprising:
a pair of support brackets having: an upper wall adapted for hanging from one said floor panel adjacent an opening therethrough; side walls; and a bottom wall;
a plurality of cover mounting tabs extending from the upper walls into the opening; and
an access cover removably mounted on the tabs.
2. An elongate channel according to claim 1 wherein at least one of the access cover and the mounting tabs includes a shear pin and a matching one of the mounting tabs and the access cover includes a shear pin receiving recess.
3. An elongate channel according to claim 1 wherein the access cover includes a latch.
4. An elongate channel according to claim 4 wherein the latch has an end clamp engaging an underside surface of the floor beam flange.
5. An elongate channel according to claim 1 wherein the bottom wall includes an equipment mounting fastener.
6. An elongate channel according to claim 1 wherein the side walls include cable mounts.
7. An elongate channel according to claim 1 wherein the bottom wall includes at least one cooling air inlet.
8. An elongate channel according to claim 7 wherein the bottom wall includes a cooling air plenum in communication with at least one said cooling air inlet.
9. An elongate channel according to claim 7 wherein the channel comprises a cooling air distribution duct having an inlet in communication with a source of pressurized cooling air and having a plurality of outlets in communication with a plurality of said cooling air inlets longitudinally spaced apart along a length of said channel.
10. An elongate channel according to claim 9 wherein the source of pressurized cooling air comprises at least one air blower.
11. An elongate channel according to claim 10 wherein the source of pressurized cooling air comprises a plurality of air blowers each having a check value disposed between the blower and the distribution duct.
12. A floor for an aircraft cabin, comprising:
a removable floor panel having an opening therethrough and fasteners for removably mounting to flanges of transverse floor beams and longitudinal floor joists;
a channel defined by a pair of support brackets having: an upper wall mounted to an underside of the floor panel adjacent the opening; side walls; and a bottom wall;
a plurality of cover mounting tabs extending from the upper walls into the opening; and
an access cover removably mounted on the tabs.
13. A floor according to claim 12 including a floor panel having cable feed through opening between a top and a bottom surface of the floor panel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An assembly, comprising:
a housing including pivotal mounting holes defining a mounting axis and including a base and a mounting pad on the base;
a micromechanical device coupled to the mounting pad; and
first and second side rails extending from the base to form first and second rail corners subject to striking a surface, as the housing pivots around the mounting axis when the housing is dropped, the first and second rail corners having first and second elevations that are uneven to reduce impacts reaching the micromechanical device.
2. The assembly of claim 1 comprising an elevational step in the second rail corner changing an elevation of the second rail corner relative to an elevation of the first rail corner to provide unevenness.
3. The assembly of claim 2 wherein the unevenness controls relative times that the impacts reach the micromechanical device.
4. The assembly of claim 1 wherein the impacts are oscillatory and a second peak impulse from the second rail corner arrives at the mounting pad out of phase with a first peak impulse from the first rail corner, providing at least partial cancellation of the first and second peak impulses at the mounting pad.
5. The assembly of claim 1 wherein the first and second side rails further comprise mounting lugs.
6. The assembly of claim 5 wherein the mounting lugs are cantilevered over the base.
7. The assembly of claim 6 wherein the mounting lugs protrude above the first and second rail corners.
8. The assembly of claim 6 wherein the housing comprises a metal die casting and the first and second side rails are portions of the die casting.
9. The assembly of claim 6 wherein the mounting lugs are deflectable and spread the impulses over time.
10. The assembly of claim 6 wherein the mounting lugs are deflectable and lower peak values of the impulses reaching the micromechanical device.
11. The assembly of claim 6 wherein the assembly comprises a disc drive assembly, and the micromechanical device comprises a disc.
12. The assembly of claim 6 wherein the assembly comprises a disc drive and the micromechanical device comprises a readwrite head.
13. The assembly of claim 6 wherein the mounting lugs have corresponding first and second lug elevations that are different from one another.
14. A method of manufacturing an assembly, comprising:
providing a housing with pivotal mounting holes defining a mounting axis, a base and a mounting pad on the base;
mounting a micromechanical device to the mounting pad;
providing first and second side rails extending from the base to form first and second rail corners subject to striking a surface as the housing pivots around the mounting axis when the housing is dropped, and
adjusting a shape of at least one of the first and second rail corners to provide first and second rail elevations that are uneven to provide a reduction of impacts reaching the micromechanical device.
15. The method of claim 14 wherein the adjusting comprises thinning a portion of the second rail to form an elevational step extending to the second rail corner.
16. The method of claim 14 wherein the reduction comprises at least partial cancelling of first and second peak impacts from the first and second rail corners by providing the first and second peak impacts out of phase at the mounting pad.
17. The method of claim 14 comprising controlling the relative times with a spacing difference between elevations on the first and second rail corners.
18. The method of claim 14 further comprising cantilevering mounting lugs over the base.
19. The method of claim 14 wherein the mounting lugs protrude above the first and second rail corners.
20. The method of claim 14 wherein the assembly comprises a disc drive assembly, and the micromechanical device comprises a disc.
21. The method of claim 14 wherein the assembly comprises a disc drive and the micromechanical device comprises a readwrite head.
22. An assembly, comprising:
a housing including pivotal mounting holes defining a mounting axis and including a base and a mounting pad on the base; a micromechanical device coupled to the mounting pad; and first and second side rails extending from the base to form first and second rail corners subject to striking a surface as the housing pivots around the mounting axis when the housing is dropped; and
unevenness in the elevation of the first and second rail corners relative to the struck surface to control relative times at which impacts reach the micromechanical device.
23. The assembly of claim 22 wherein the means for controlling comprises an elevational step thinning a portion of one of the rails, the elevational step extending to the rail corner.
24. The assembly of claim 22 wherein the means for controlling comprises mounting lugs attached to the rail corners and cantilevered over the base.
25. A method of shock cancellation, comprising:
providing a housing including pivotal mounting holes defining a mounting axis and including a base and a mounting pad on the base;
providing a micromechanical device coupled to the mounting pad; and
providing first and second side rails extending from the base to form first and second rail corners subject to shocks upon striking a surface;
providing the first and second rail corners with first and second elevations that, when the housing pivots around the mounting axis when the housing is dropped, are uneven to provide shocks that are spaced apart in time in order to at least partially cancel the shocks reaching the mounting pad.
26. The method of claim 25 wherein the shocks have damped oscillatory waveshapes and the cancellation of the shocks at the mounting pad is due to subtractive interference of the damped oscillatory waveshapes.
27. The method of claim 25 wherein the shocks are oscillatory and a second peak impulse from the second rail corner arrives at the mounting pad out of phase with a first peak impulse from the first rail corner, providing at least partial cancellation of the first and second peak impulses at the mounting pad.