FR2564606A1 - IMPROVEMENTS IN CLOSURE ARRANGEMENTS, IN PARTICULAR FOR AIR-TAKING APPARATUSES - Google Patents

Abstract

THE INVENTION CONCERNS PROTECTIVE DEVICES FOR PHOTOGRAPHIC SHOOTING WINDOWS. CLOSING BODY 4 REMOTE ACTIONABLE 5, 7, 8, 11, 12, 13 IN AN OPEN OR CLOSED POSITION FOR THE PROTECTION OF WINDOWS 2, OR SIMILAR IN ADVERSE CONDITIONS. APPLICATION IN PARTICULAR TO WINDOWS OF PHOTOGRAPHIC AERIAL RECOGNITION NACELLE.

Description

Improvements to closing devices

  especially for aerial cameras.

  The invention relates to closure members and more particularly, but not exclusively, to

  electrically operated closing members of the type

  green or closed although there are various areas in which

  a closure member as described in the present

  If desired, this member will be advantageously used in relation to the front window

  a photographic aerial basket.

  In such nacelles, windows made of special optical glass for normal photographic photography, or germanium windows and similar windows for television-type photographs are

  very expensive and it is therefore essential to avoid them -

  damage as a result of scratches and scratches

  dust and gravel particles

  thrown at taxi, takeoff and landing. This problem is even more important in VTOL (Vertol) aircraft whose tailpipes are aimed downward on take-off and landing, so

  larger amount of foreign particles is

  in the vicinity of the nacelle that is normally

  hanging on a wing or fuselage.

  The closing devices for nacelles are not

  not new but so far they consisted of large -

  panels of similar shape to the wall of the nacelle and were driven in open or closed position by chain or belt drives. One of the problems

  posed by such closures is that they tend to

  to increase the size of the platform and, in particular,

  its diameter. Of course, the larger the diameter of the

  nacelle is small, the better the characteristics

  aerodynamic issues. In some cases, for

  To a smaller diameter, detachable closing members, locked on the wall of the nacelle, released electrically or mechanically, then aerodynamically detached from the nacelle to disappear to the ground; in fact, their separation from the nacelle is often aided by the use of an elastic catapult attached to the nacelle wall. Normally, the actuation of these closing members occurs when the nacelle system is switched to the standby position and in the case of non-detachable closure members, they are normally closed when the photographic system is stopped. These two types

  mentioned above of closure members

  obvious defects to which the present invention is

proposes to remedy.

  The invention therefore relates to a closure member that can be closed to protect a viewing medium and opened to allow photography o and when

we want it.

  The subject of the invention is a closure member which can be actuated in at least two positions and which comprises a movable flap actuated by drive members towards the first of the at least two positions, and

  means for reversing the drive members for en-

  move the movable shutter to the second of two

at least.

  The invention will be better understood when reading

  the detailed description that will follow and under study

  annexed drawings which represent, as a non

  limiting, an embodiment of the invention.

  In these drawings: - Figure 1 shows the closure member and its drive means; - Figure 2 shows the closure member

in open position.

  A nacelle structure, not shown,

  carries a frontal cone designated as a whole by the

  reference 1 in Figure 1. Inside the frontier cone

  it is arranged an optical glass element, crystal or germanium, called a sighting medium, substantially in alignment and behind an opening 2, formed in a guide 3. A closure flap 4 advantageously flexible in a single plane is slidably mounted in the guide 3 to close the opening 2 and protect the sighting medium. The shutter 4 can be opened or closed at will by using appropriate opening and closing members such as levers or Bowden cables. Of

  preferably, for remote control, an electric motor

  reversible pole 5, suitably mounted on a support 6 drives, by a worm drive 7, a toothed wheel 8 mounted concentrically on a journalled shaft 9. An electrical coupling 10, when

  is powered, couples the shaft 9 to a pignorr'-

  11 which in turn drives a 12 mounted driven pinion

  concentrically on a second journalled shaft 13.

  Two bent arms 14 and 15 are each mounted at one of their ends on the opposite ends of the shaft 13 and the free ends of the crank levers

  14 and 15 are attached to the upper part of the flap 4.

  Switching the motor 5 to the open position and

  feeding the coupling to the position of

  stretching rotates the ends of the arms of the-

  14 and 15 attached to the flap to raise the flap 4

along the guide 3.

  As the stroke of the lever arms 14 and 15 is curved, it is necessary that the flap is flexible in a plane while maintaining sufficient rigidity when it is housed in the guides 3 to withstand the very high air pressures that occur. exert on the outer face of the closure member in flight at high speeds. For this purpose, a material such as that sold under the trade name of

  "FIBRELAM" and several longitudinal notches are

  nales in the wall of the shutter that faces the middle of sight. As the main objective of an aerial reconnaissance pod is photography, elastic means, such as two springs 16 and 17 are mounted

  on each of the bent arms 14 and 15 to ensure the

  emergency release of the shutter in case of failure of

engine.

  In Figure 2 which represents the iron organ

  in the open position, the effect of the notches

  longitudinal dimensions of the flap material

  clearly. The action of the two springs 16 and 17

is also obvious.

  A device for detecting the current intensity can advantageously be incorporated so that in the event of motor blockage, the coupling can be dissociated to allow the elastic means to

  take over and open the closing organ.

  Training devices have been described for

  close and close the closing device as being electri-

  but it is obvious to those skilled in the art

  that one could as well use hydrau-

  or pneumatic. It is also obvious that the invention does not apply only to a photographic nacelle as described but to many

other applications.

  It is also obvious that improvements such as reversing microswitches, actuated by

  the position of the bent arms 14 or 15 may be

  to interrupt the motor power supply in the open and closed positions, or in positions

  intermediaries if necessary, and to prepare the

  cooked to work in reverse.

Claims (7)

R E V E N D I C A T IONS   1. Closing member operable to at least one of two positions, characterized in that it comprises a movable flap (4) actuated by drive members (5-15) towards the first of the two positions. at least, and means for inverting the drive members to actuate the movable flap towards the   second of two positions at least.   2. Closure member according to claim 1; characterized in that the drive members comprise a motor (5) and a drive (7-13) operably connected to at least one bent arm (14,   ) for actuating the closure member.   3.- Closing organ according to the claim   1 according to claim 2, characterized in that an electrical coupling (10) is energized to transfer energy from the motor (5) and the arm drive. bent (14, 15).   4.- Closing organ according to any one   Claims 1 to 3, characterized in that the shutter   movable closes an opening (2) to protect a medium   substantially aligned with said aperture.   5. Closure member according to claim 4, characterized in that the movable flap comprises a piece of "FIBRELAM" (registered trademark) comprising a   plurality of longitudinal notches in its ori- towards the middle of sight.   6. Closing organ according to one of the claims   cations 1 to 5, characterized in that it comprises elastic means (16, 17) to ensure an opening   emergency shutter in the event of engine failure.   7. A closure member according to claim 3, characterized in that it comprises a device for detecting the intensity of the current to interrupt the supply of the electrical coupling in case of engine blockage.