CN101901990A - Plug-in locking device for field replaceable modules - Google Patents

Abstract

The invention belongs to the technology of fasteners, and relates to a plug-and-pull locking device for an outfield replaceable module used in aviation airborne electronic equipment. The plug-in locking device includes a lock hook, a torsion spring, a pin shaft, a set screw, a handle, a stage clip, a dead bolt, a pressing plate, and a countersunk screw. The device is a mechanical device used for inserting, pulling out and locking the field replaceable modules of aviation airborne electronic equipment. It is mainly used to overcome the insertion and withdrawal force of the electrical connector when the module is pushed in and out, to ensure that the movement track of the module is a linear slip when the module is loaded and unloaded, so that the electrical connector is completely kept engaged when the module is impacted and vibrated, and the signal transmission is ensured. normal. Moreover, it is ensured that the external force on the module will not be transmitted to the terminals of the electrical connector to cause mechanical damage or electrical performance failure. The device of the invention has triple functions of inserting, pulling out and locking the module to the chassis.

Description

Plug-in locking device for field replaceable modules

technical field

The invention belongs to the technology of fasteners, and relates to a plug-and-pull locking device for an outfield replaceable module used in aviation airborne electronic equipment.

Background technique

With the development trend of lightweight and miniaturization of avionics equipment, higher requirements are put forward for the rapid installation and disassembly of the equipment. Strict field mean time to repair (MTTR) requirements make the concept of field replaceable modules emerge as the times require, and the Insertion/Extraction Device (IED) is an essential and important component in the application of field replaceable modules. When the module is pushed into and pulled out of the equipment chassis, the electrical connector of the module printed board sub-board and the chassis motherboard engages or separates, and the function of the plug-in device is to provide and overcome the need for this electrical connector to engage or separate The insertion force ensures that the movement track of the module is a linear slip when loading and unloading, so as to ensure that the external force on the module will not be transmitted to the electrical connector terminals to cause mechanical damage or electrical performance failure. Most of the devices currently used in aviation systems use a lever-like device to pry up the module. This device only has the function of pulling the module out of the chassis, and cannot overcome the problem caused by the engagement of the electrical connector when the module is inserted. force, making the module's electrical connector terminals highly susceptible to damage and making it impossible to lock the module in the chassis.

Contents of the invention

The object of the present invention is to propose a plug-in and pull-out locking device for field-replaceable modules that simultaneously has the functions of plugging in, pulling out, and locking. The technical solution of the present invention is that the plug-in locking device includes a lock hook, a torsion spring, a pin shaft, a set screw, a handle, a compression spring, a dead bolt, a pressure plate, a countersunk screw, a screw for the lock hook, a spring washer, The washer is fixed on the front panel of the module, the handle is "U" shape, two lugs are symmetrically arranged on the flanges at one end of the two side walls of the handle, and the lock hook is connected to the two lugs of the handle with a pin shaft. On the ear, the torsion spring is placed in the middle of the pin shaft, and the top of the lock head on the lock hook has a slope; Two threaded holes are arranged on the inner side of the bottom surface of the hand near the lock hook, two through holes are symmetrically arranged on the two side walls of the other end of the handle, and there is a rectangular hole in the middle of the dead bolt, and one side wall of the rectangular hole is an inclined plane. The slope of the rectangular hole corresponds to the slope at the top of the lock head; a rectangular groove is provided on the inner side of the bottom surface of the handle corresponding to the rectangular hole in the middle of the deadbolt, and the rectangular groove forms a cavity with the rectangular hole of the deadbolt , the compression spring is located in the cavity, and there is a square opening on the position of the pressure plate corresponding to the cavity. A limit block is provided on the contact surface between the root of the square opening and the lock tongue, and one end of the opening of the pressure plate is fixed on the lifting handle by two countersunk screws. In the threaded hole of the hand, two screws fix the other end of the pressure plate on the handle side wall through the threaded holes on the two side walls of the pressure plate.

The locking hook can also be fixed on the side of the module or the printed circuit board therein.

The torsion spring can also be a leaf spring.

The invention has the advantages and beneficial effects. The device is a mechanical device used for inserting, pulling out and locking the field replaceable module (LRM) of the aviation airborne electronic equipment. It is mainly used to overcome the plugging force required when the electrical connector on the back is engaged and separated when the module is pushed in and pulled out, so as to ensure that the movement track of the module is a linear slip when the module is loaded and unloaded, so that when the module is impacted and vibrated, the electrical connector The fully engaged, the signal transmission is normal. Moreover, it is ensured that the external force on the module will not be transmitted to the terminals of the electrical connector to cause mechanical damage or electrical performance failure.

The device has the following features:

1. There is no need to adjust and use external tools during the plugging and unplugging of the field replaceable modules;

2. When the electrical connector is fully engaged in place, the device provides a clear visual and auditory indication;

3. When locking the replaceable module in the field, the allowable position error when the electrical connector is engaged is 1.5mm, and the nominal linear stroke is less than 7mm when locking;

4. The locking direction of the replaceable module in the field is perpendicular to the vibration direction, which can prevent unlocking by misoperation;

5. The device has a simple structure, quick insertion and removal, reliable locking, and the shape conforms to the principles of ergonomics.

Description of drawings

Fig. 1 is a schematic diagram of the installation position of the present invention on airborne equipment;

Fig. 2 is a schematic view of the shaft side profile of the present invention;

Fig. 3 is an exploded view of the shaft side of the present invention;

Fig. 4 is a longitudinal sectional view of the present invention in a normally locked state in the cabinet;

Fig. 5 is a longitudinal sectional view of the present invention when the module is pulled out from the chassis;

Fig. 6 is an axial side view of the middle pressure plate 8 of the present invention;

Fig. 7 is a side view of the locking hook 1 in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings. The application position of the present invention in aviation airborne electronic equipment is shown in FIG. 1 . The plug-in locking devices 10 are usually used in pairs, and are symmetrically installed on the front panel of the module 11 , while the module 11 is inserted and fixed in the case 12 .

It can be seen from Fig. 3 that the plug-in locking device 10 has 9 parts in total, which are lock hook 1, torsion spring 2, pin shaft 3, set screw 4, handle 5, compression spring 6, lock tongue 7, and pressing plate. 8. Countersunk head screw 9.

Lock hook 1 is fixed on the front panel of module 11 with screw 13, spring washer 14, washer 15, and handle 5 is a " U " shape structure, and the flange of two side walls of handle 5 one ends is symmetrically provided with two Two lugs 17, the lock hook 1 is connected on the two lugs 17 of the handle 5 with the pin shaft 3, the torsion spring 2 is set in the middle of the pin shaft 3, and the top of the lock head 18 on the lock hook 1 has a slope 19 Have a square hole 20 at the position corresponding to the lock head 18 of the locking hook 1 on the bottom plane of the handle 5, and be provided with two threaded holes 21 near the end of the locking hook 1 on the inside of the bottom surface of the handle 5. Two through holes 22 are symmetrically arranged on the two side walls of the other end of the hand 5, and there is a rectangular hole 23 in the middle of the dead bolt 7, and a side wall of the rectangular hole 23 is an inclined plane 24, and the inclined plane 24 and the inclined plane 19 on the top of the lock head 18 Corresponding; the inside of the bottom surface of the handle 5 is provided with a rectangular groove 25 at a position corresponding to the rectangular hole 23 in the middle of the dead bolt 7, and the rectangular groove 25 forms a cavity 26 with the rectangular hole 23 of the dead bolt 7, and presses Spring 6 is positioned at cavity 26, and pressure plate 8 has a square opening 27 on the position corresponding to cavity 26, and the root portion of square opening 27 and the contact surface of dead bolt 7 are provided with stopper 28, and one end of pressure plate 8 openings passes two One countersunk screw 9 is fixed in the threaded hole 21 of handle 5, and two screws 4 fix the other end of pressing plate 8 on the side wall of handle 5 by threaded holes 29 on both side walls of pressing plate 8.

In the assembly of Fig. 3, the torsion spring 2 and the locking hook 1 are fixed on the handle 5 by the pin shaft 3, and these four parts are fixed on the front panel of the module 11 by the screw 13, the spring washer 14, and the washer 15 together ( See Fig. 4, Fig. 5), plug-in locking device 10 rotates around pin shaft 3 when inserting module 11, handle 5 at this moment just becomes a lever, and its fork-shaped upper jaw and lower jaw become pulling out and inserting force the fulcrum. The torque of the torsion spring 2 ensures that the handle 5 and the front panel of the module 11 form a fixed angle when not inserted, which makes it unnecessary to adjust the position of the plug-in locking device 10 when the module 11 is inserted. The pressure plate 8 is fixed on the handle 5 through two countersunk screws 9 and two set screws 4, which provides space for the mechanism action of the compression spring 6 and the dead bolt 7, and is also a mechanical limit of its stroke.

When inserting the module 11 into the chassis 12, you only need to press the handles 5 of the two plug-in locking devices 10 with the thumbs of both hands, and the slope surface 24 on the bolt 7 contacts the slope surface 19 at the corresponding position on the lock hook 1. Slide, the lock tongue 7 stretches out first and then retracts, and at the same time it makes a "beep" sound, the arrow mark 30 (see Figure 2) on the lock tongue 7 is completely exposed, and the module 11 has been engaged in place at this time, which requires strict heat dissipation The chassis can be locked on the module 11 with a wedge-shaped locking block 16, as shown in FIG. 4 . At this moment, both the torsion spring 2 and the compression spring 6 are in a compressed state, the fork-shaped lower jaw of the handle 5 and the protruding part of the groove of the chassis 12 are closely attached, and the module 11 is reliably fixed.

The process of pulling out the module 11 is just the opposite. Use the thumbs of both hands to press the lock tongues 7 of the two plug-in locking devices 10 in the direction indicated by the arrows, and at the same time rotate around the pin shaft 3 to open them until the electrical connector of the module 11 and the chassis 12's motherboard electrical connectors were successfully separated.

During storage and transportation of the module 11, the plug-in locking device 10 should be in the locked state shown in FIG. 4 .

Claims (3)

1. plug-pull locking device for external replaceable module, it is characterized in that, plug-pull locking device comprises latch hook (1), torsion spring (2), bearing pin (3), holding screw (4), handle (5), stage clip (6), dead bolt (7), pressing plate (8), sunk screw (9), latch hook (1) screw (13), spring washer (14), packing ring (15) is fixed on the front panel of module (11), handle (5) is " U " shape structure, be arranged with two lugs (17) on the flange of two sidewalls of handle (5) one ends, latch hook (1) is connected on two lugs (17) of handle (5) with bearing pin (3), torsion spring (2) is enclosed within the centre of bearing pin (3), and an inclined-plane (19) is arranged at the top of the tapered end (18) on the latch hook (1); Tapered end (18) the opposite position place that has on the baseplane of handle (5) with latch hook (1) has a square hole (20), an inboard end near latch hook (1) is provided with two screwed holes (21) in handle (5) bottom surface, be arranged with two through holes (22) on the two side of handle (5) other end, there is a slot (23) centre of dead bolt (7), a sidewall of slot (23) is inclined-plane (24), and the inclined-plane (24) of slot (23) is corresponding with the inclined-plane (19) at tapered end (18) top; The corresponding position of slot (23) that the bottom surface of handle (5) is inboard and dead bolt (7) is middle is provided with a rectangular recess (25), rectangular recess (25) forms a cavity (26) with the slot (23) of dead bolt (7), stage clip (6) is arranged in cavity (26), have a square aperture (27) on the position of the corresponding cavity of pressing plate (8) (26), the contact-making surface of the root of square aperture (27) and dead bolt (7) is provided with guide vane end stop (28), one end of pressing plate (8) opening is fixed on by two sunk screws (9) in the screwed hole (21) of handle (5), and two screws (4) are fixed on the other end of pressing plate (8) on handle (5) sidewall by the screwed hole (29) on (8) two sidewalls of pressing plate.

2. plug-pull locking device for external replaceable module according to claim 1 is characterized in that, described latch hook (1) is fixed on the side or printed circuit board wherein of module (11).

3. plug-pull locking device for external replaceable module according to claim 1 is characterized in that, described torsion spring (2) is the sheet spring.

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