A self-concealing folding lug device

Abstract

This invention relates to a self-concealing folding lifting lug device in the field of hoisting technology for flying objects. It includes a U-shaped lifting lug, a base installed at the bottom within a cavity, and a cavity wall plate corresponding to the top of the base. The cavity wall plate has a U-shaped notch on its surface. The U-shaped lifting lug includes a top horizontal section and two vertical support sections, each located in one of the two longitudinal slots of the U-shaped notch. The bottom ends of the vertical support sections are rotatably connected to the top of the base via a pivot, allowing the U-shaped lifting lug to close the U-shaped notch after rotating from its external hanging state. The outer surface of the U-shaped lifting lug aligns with the outer surface of the cavity wall plate. A torsion spring is fitted onto the pivot, with its two lever arms connected to the U-shaped lifting lug and the base, respectively, giving the U-shaped lifting lug a tendency to lie down. Both the inner and outer surfaces of the U-shaped lifting lug are designed as inclined planes that form an angle with each other, and the rotation center of the pivot is offset from the bisector of this angle. This lifting lug device is simplified, lightweight, and standardized while optimizing its aerodynamic shape.

Description

Technical Field

[0001] This invention relates to the field of hoisting technology for suspended objects, and in particular to a self-concealing folding lifting lug device. Background Technology

[0002] As is well known, objects are usually attached to the fuselage via lugs or suspended from the fuselage. Once the object is deployed or released from the launch phase, the suspension function is complete. If the lugs remain externally attached, it not only looks awkward in terms of structure but also increases the aerodynamic drag of the fuselage. Therefore, the traditional method is to use folding technology to fold the lugs from the cavity opening and retract them into the fuselage cavity, and then control the opening and closing plate to automatically close the cavity opening. The whole mechanism is very complex.

[0003] Chinese invention patent CN209386894U discloses a folding lug device that can compensate for aerodynamic shape by relying solely on the folding lug and the body structure without using auxiliary structures such as caps or covers. This simplifies the structure and control while meeting aerodynamic requirements. However, the existing patent has the following drawbacks: First, the lug is generally square-shaped, and its shape does not quite meet the lug mounting standards. It is also heavy and not flexible enough in terms of rotation and folding. The protrusion structure used to fill the lug hole is also directly set inside the body, occupying a large space. More importantly, when the lug is upright, both the left frame-shaped hole and the arc surface in the middle of the lug will increase wind resistance to a certain extent. Second, the lug cannot automatically lie down and hide. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art and solve the existing technical problems, the present invention discloses a self-concealing folding lug device, which is more simplified, lighter and more standardized, while optimizing the aerodynamic shape.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A self-concealing folding lug device includes a U-shaped lug, a base installed at the bottom of a cavity, and a cavity wall plate corresponding to the top of the base. The cavity wall plate has a U-shaped notch formed by a horizontal slot and two vertical slots. The U-shaped lug includes a top horizontal section and two vertical support sections connected to both ends of the top horizontal section. The two vertical support sections are located in the two vertical slots of the U-shaped notch. The bottom end of the vertical support section is rotatably connected to the top of the base via a pivot along the direction of the top horizontal section, so that the U-shaped lug can block the U-shaped notch when it is rotated and folded down from the external hanging state, and the outer ear surface of the U-shaped lug is flush with the outer surface of the cavity wall plate. A torsion spring is sleeved on the pivot, and the two lever arms of the torsion spring are respectively connected to the U-shaped lug and the base, so that the U-shaped lug has a tendency to fold down. The inner and outer ear surfaces of the U-shaped lug are both set as inclined surfaces that can form an angle with each other, and the rotation center of the pivot is offset from the bisector of the angle.

[0007] Furthermore, when the U-shaped lug is in a lying position, the torsion spring still has the residual force to suppress the U-shaped lug from automatically springing up.

[0008] Furthermore, the base is fixed with a central locking block and two side blocks symmetrically arranged on both sides of the central locking block. The central locking block and the side blocks are respectively provided with threaded holes and insertion holes on the same axis. A rotating shaft is inserted into the insertion hole of each side block. A torsion spring is sleeved on the outer end of the rotating shaft, and an external thread adapted to be screwed into the threaded hole is provided on the inner end of the rotating shaft. The bottom ends of the two vertical support sections of the U-shaped lifting lug are respectively movably inserted into the gaps between the two side blocks and the central locking block, and the bottom ends of the vertical support sections are provided with rotating holes adapted to be rotated through by the corresponding shaft of the rotating shaft.

[0009] Furthermore, the outer wall of the side block is provided with a positioning screw hole with a vertically connected insertion hole, and the shaft body corresponding to the positioning screw hole is provided with a positioning ring groove. A safety screw for abutting the bottom of the positioning ring groove is adapted to be screwed into the positioning screw hole.

[0010] Furthermore, a wear-resistant bushing is installed in the rotating hole.

[0011] Furthermore, a limiting block is provided in front of the base to abut against the inner ear surface of the U-shaped hanging lug when the base is in a lying position; a buffer pad is provided on the upper surface of the limiting block.

[0012] Furthermore, the outer surface of the cavity wall plate is detachably fitted with a detachable positioning plate for abutting against the inner ear surface of the U-shaped hanging lug when in the external hanging state.

[0013] Furthermore, the bottom end of the support section extends outward from the side of the outer ear of the U-shaped hanging lug to form a first limiting part, and the base is provided with a second limiting part that can correspond to and abut against the first limiting part, so that the U-shaped hanging lug has a rotation limit from the lying state to the hanging state.

[0014] Furthermore, the wall of the horizontal bar hole away from the vertical bar hole is provided with a groove, and a protective plate is slidably inserted in the groove. A spring is connected between the inner end of the protective plate and the bottom surface of the groove. The outer end of the protective plate is provided as a U-shaped fork that can extend out of the groove to cover the U-shaped notch when the U-shaped lug is in the external hanging state. The end of the U-shaped fork that abuts against the U-shaped lug is bent outwards at an angle to form a slanted top fold. The slanted top fold is lower than the outer surface of the cavity wall plate, and the groove opening of the groove is provided with a chamfer for accommodating the slanted top fold.

[0015] Furthermore, the outer surface of the cavity wall plate is provided with a set screw hole that extends through to the groove opening of the cavity, and a countersunk screw for screwing in the set screw hole is provided for screwing in the protective plate.

[0016] By employing the technical solution described above, the present invention has the following beneficial effects:

[0017] The self-concealing folding lug device disclosed in this invention uses a U-shaped lug to seal the U-shaped hole in the cavity wall plate. After eccentric design, the upper supporting body of the lug can be in a double-sided inclined cone shape, which is more in line with the lug standard. When automatically folding with torsion spring, no additional filling structure is needed to occupy the cavity space. This makes the opening area of ​​the cavity wall plate smaller, making manufacturing more convenient. The aerodynamic shape of the outer plate is more intact, providing better protection for the inside of the cavity. It also makes the U-shaped lug itself lighter and more flexible in rotation. The rotating part of the lower part of the U-shaped lug can also be better protected in the cavity, reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a side view of the U-shaped lifting lug of the present invention in its external hanging state;

[0019] Figure 2 This is a front view schematic diagram of the U-shaped lifting lug of the present invention in its external hanging state;

[0020] Figure 3 This is a top view of the U-shaped lifting lug of the present invention in a reclining state;

[0021] Figure 4 yes Figure 3 A schematic diagram of the AA-direction cross-section structure;

[0022] Figure 5 yes Figure 4 A schematic diagram of the structure with the U-shaped lifting lugs in their external hanging state;

[0023] Figure 6 This is a top view of the protective plate.

[0024] Figure 7 yes Figure 1 A three-dimensional schematic diagram of the exploded structure.

[0025] In the diagram: 1. Cavity wall plate; 2. U-shaped notch; 3. U-shaped lug; 301. Outer ear surface; 302. Inner ear surface; 303. First limiting part; 4. Base; 5. Rotating shaft; 6. Side block; 7. Safety screw; 8. Limiting block; 9. Central locking block; 10. Torsion spring; 11. Countersunk screw; 12. Slot cavity; 13. Protective plate; 1301. Sloping top folded edge; 14. Spring. Detailed Implementation

[0026] The technical solution of the present invention will now be described with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are only used to correspond to the accompanying drawings of the present invention for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0027] Example 1:

[0028] Combined with appendix Figure 1 , 2 The self-concealing folding lug device described in section 7 includes a U-shaped lug 3, a base 4 installed at the bottom inside the cavity, and a cavity wall plate 1 corresponding to the top of the base 4. The cavity wall plate 1 has a U-shaped notch 2 formed by a horizontal hole and two vertical holes. The U-shaped notch 2 allows the cavity wall plate 1 to have a smaller opening area, making it easier to manufacture, and the aerodynamic shape of the outer plate is more complete, providing better protection for the inside of the cavity. The U-shaped lug 3 includes a top horizontal section and two vertical support sections connected to both ends of the top horizontal section. The two vertical support sections are located in the two vertical holes of the U-shaped notch 2. The bottom end of the vertical support section is rotatably connected to the top of the base 4 through a pivot 5 along the direction of the top horizontal section, so that the U-shaped lug 3 can seal the U-shaped notch 2 when it is rotated and folded down from the external hanging state. The outer ear surface 301 of the U-shaped lug 3 is flush with the outer plate surface of the cavity wall plate 1. Whether the outer plate surface of the cavity wall plate 1 is flat or curved, the U-shaped lug 3 is flush with the outer plate surface of the cavity wall plate 1. The outer ear surfaces 301 of the lugs 3 can all be designed to be consistent. As needed, the pivot 5 is fitted with a torsion spring 10. The two lever arms of the torsion spring 10 are respectively connected to the U-shaped lugs 3 and the base 4, so that the U-shaped lugs 3 have a tendency to lie down. When the U-shaped lugs 3 are mounted, they can be manually erected. When the load is released, the U-shaped lugs 3 can lie down automatically under the action of the torsion spring 10. When the U-shaped lugs 3 are in the lying state, the torsion spring 10 still has the spare force to suppress the U-shaped lugs 3 from automatically jumping up under the inertial load of autonomous flight. When designing this spare force, the motion state of the aircraft must be considered to ensure that the lying U-shaped lugs will not be lifted up due to the vibration of the aircraft or the influence of airflow in any direction. Generally, the U-shaped lugs 3 are designed in pairs. The lying directions of the two U-shaped lugs 3 may be the same or opposite, may be with the wind or against the wind. In any case, the requirement of not automatically jumping up should be met.

[0029] As required, both the inner ear surface 302 and the outer ear surface 301 of the U-shaped lug 3 are designed as inclined surfaces that can form an angle with each other. After the eccentric design, the upper supporting body of the lug can be in a double-inclined conical shape, which is more in line with the lug standard and ensures that the interface compatibility remains unchanged. Then, according to the preset lying direction of the U-shaped lug 3, the outer ear surface 301 is curved to meet the requirement of being flush with the curved surface of the fuselage after lying down. It should be noted that the inclined surface here is not necessarily an inclined plane, but refers to the inclination trend of the overall surface of the outer ear surface 301 relative to the inner ear surface 302. The outer ear surface 301 itself must first meet the aerodynamic requirements. When both the inner ear surface 302 and the outer ear surface 301 are inclined surfaces, only by designing the rotation center of the rotating shaft 5 to deviate from the angle bisector of the included angle can rotational interference be avoided and the requirement of the U-shaped lug 3 to seal the U-shaped notch 2 be met. The specific deviation direction is shown in the attached figure. Figure 1 As shown, the rotation direction deviates due to the U-shaped lifting lug.

[0030] As needed, the bottom end of the support section extends outward from the side of the outer ear surface 301 of the U-shaped lug 3 to form a first limiting part 303. The base 4 is provided with a second limiting part that can correspond to and abut against the first limiting part 303, so that the U-shaped lug 3 has a rotation limit from the lying state to the hanging state. This limiting part can not only position the U-shaped lug 3 in the vertical hanging state, which is generally 90 degrees vertical, but also increase the load in the contact direction of the first limiting part 303. In addition, the base 4 is provided with a limiting block 8 that corresponds to the inner ear surface 302 of the U-shaped lug 3 when it is lying down. The limiting block 8 can position the U-shaped lug 3 in the lying down state. Specifically, a buffer pad can be provided on the upper surface of the limiting block 8 to reduce the impact of vibration of the U-shaped lug 3 and avoid structural wear.

[0031] Preferably, the base 4 has a central locking block 9 fixed to its top and two side blocks 6 symmetrically arranged on both sides of the central locking block 9. The central locking block 9 and the side blocks 6 are respectively provided with threaded holes and insertion holes on the same axis. A rotating shaft 5 is inserted into the insertion hole of each side block 6. A torsion spring 10 is sleeved on the outer end of the rotating shaft 5, and the inner end of the rotating shaft 5 is provided with an external thread adapted to be screwed into the threaded hole, which is generally a fine thread. The bottom ends of the two vertical support sections of the U-shaped lifting lug 3 are respectively movably inserted into the gaps between the two side blocks 6 and the central locking block 9, and the bottom ends of the vertical support sections are provided with rotating holes adapted to be rotated through by the corresponding shafts of the rotating shaft 5. This ensures that the entire rotating structure is easy to install, while also allowing the side blocks 6 and the central locking block 9 to be used to support the U-shaped lifting lug 3. The clamping mechanism increases the load capacity of the U-shaped lifting lug 3 in the clamping direction. It also increases the external tensile load of the U-shaped lifting lug 3 by increasing the diameter of the rotating shaft 5 and the wall thickness of the rotating hole, insertion hole, and threaded hole. As needed, the outer wall of the side block 6 is provided with a positioning screw hole with a vertically connected insertion hole. The shaft of the rotating shaft 5 is provided with a positioning ring groove corresponding to the positioning screw hole. A safety screw 7 is screwed into the positioning screw hole to abut against the bottom of the positioning ring groove. The safety screw 7 prevents the rotating shaft 5 from accidentally dislodging from the threaded hole of the central locking block 9. Alternatively, abutting material can be designed on the outer end face of the rotating shaft 5 to achieve the same effect. Furthermore, a wear-resistant bushing, such as a tin bronze bushing, is installed in the rotating hole to ensure smooth rotation while bearing the load.

[0032] As needed, the outer panel of the cavity wall plate 1 is detachably equipped with a detachable positioning plate for abutting against the inner ear surface 302 of the U-shaped lifting lug 3 when in the external hanging state. This is mainly to prevent manual hanging of the U-shaped lifting lug 3 from being held vertically by hand. Instead, the detachable positioning plate is used for abutting and positioning. After the hanging is completed, the detachable positioning plate is removed.

[0033] When implementing the self-concealing folding lug device described in this invention, after assembling the U-shaped lug 3, during the mounting process, it is only necessary to manually rotate and lift the U-shaped lug 3, and then support it or use the detachable positioning plate to hold the U-shaped lug 3 in an external hanging state before mounting. When the load is released during the flight of the aircraft, the U-shaped lug 3 can automatically rotate and lie down to block the U-shaped notch 2 through the torsion spring 10, and keep the aerodynamic shape of the aircraft at this point smooth.

[0034] Example 2:

[0035] As attached Figure 3-6As shown, the difference from Embodiment 1 is that no additional detachable positioning plate is needed to position the U-shaped lifting lug 3 during external loading. Specifically, a groove 12 is provided in the wall of the horizontal bar hole away from the vertical bar hole. A protective plate 13 is slidably inserted in the groove 12. A spring 14 is connected between the inner end of the protective plate 13 and the bottom surface of the groove 12. The outer end of the protective plate 13 is designed to extend out of the groove 12 to cover the U-shaped notch 2 when the U-shaped lifting lug 3 is in the external loading state. The end of the U-shaped fork that abuts against the U-shaped lifting lug is bent outwards towards the cavity wall plate 1 to form a sloping top fold 1. 301, the sloping top flange 1301 is lower than the outer plate surface of the cavity wall plate 1, and the groove opening of the cavity 12 is provided with a chamfer for accommodating the sloping top flange 1301; when the U-shaped lifting lug 3 rotates outward and stands upright, under the action of the spring 14, the protective plate 13 extends out of the cavity 12, which can not only resist the U-shaped lifting lug 3, but also cover the exposed part of the U-shaped notch 2, improving the cavity protection, and also optimizing the aerodynamic shape at this time by blocking the U-shaped notch 2. When the U-shaped lifting lug 3 releases the carrier and rotates to lie down, it can also automatically push the protective plate 13 back into the groove. In cavity 12, the design of the sloping top flange 1301 ensures that the U-shaped lifting lug 3 will not press against the guard plate 13 and get stuck during the entire process of rotating and lying down. Furthermore, the chamfer of cavity 12 can accommodate the sloping top flange 1301, ensuring that the U-shaped lifting lug 3 does not leave a large gap when filling the U-shaped missing hole 2. As needed, the outer surface of the cavity wall plate 1 is provided with corresponding set screw holes that extend to the opening of the cavity 12. These set screw holes are equipped with countersunk screws 11 for tightening the countersunk screws that abut against the guard plate 13. When the U-shaped lifting lug 3 is installed and erected, the lying force of the torsion spring 10 will definitely be large. Due to the external thrust of the spring 14, the U-shaped lifting lug 3 cannot automatically push back the guard plate 13 when it is lying down. Therefore, when loading the U-shaped lifting lug 3, the countersunk screw 11 can be tightened to press against and tighten the guard plate 13, so that the guard plate 13 can be positioned against the U-shaped lifting lug 3 without having to hold the U-shaped lifting lug 3. After loading is completed, the countersunk screw 11 can be loosened. Of course, if you do not want to use the guard plate 13 throughout the process, you can tighten the countersunk screw 11 when the guard plate 13 is retracted into the slot 12 and leave the guard plate 13 in the slot 12 without using it.

[0036] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A self-concealing folding lug device, characterized in that: The device includes a U-shaped lug (3), a base (4) installed at the bottom inside the cavity, and a cavity wall plate (1) corresponding to the top outside of the base (4). The cavity wall plate (1) has a U-shaped notch (2) formed by a horizontal bar hole and two vertical bar holes. The U-shaped lug (3) includes a top horizontal section and two vertical support sections connected to both ends of the top horizontal section. The two vertical support sections are located in the two vertical bar holes of the U-shaped notch (2). The bottom end of the vertical support section is rotatably connected to the top of the base (4) through a rotating shaft (5) along the direction of the top horizontal section, so that the U-shaped lug (3) can be lifted from the outside. When the hanging state is rotated and laid down, it can seal the U-shaped hole (2), and the outer ear surface (301) of the U-shaped hanging lug (3) is flush with the outer plate surface of the cavity wall plate (1); the rotating shaft (5) is fitted with a torsion spring (10), and the two lever arms of the torsion spring (10) are respectively connected to the U-shaped hanging lug (3) and the base (4) so ​​that the U-shaped hanging lug (3) has a tendency to lie down; the inner ear surface (302) and the outer ear surface (301) of the U-shaped hanging lug (3) are both set as inclined surfaces that can form an angle with each other, and the rotation center of the rotating shaft (5) is deviated from the angle bisector of the angle; The horizontal bar hole is provided with a groove (12) on the wall away from the vertical bar hole. A protective plate (13) is slidably inserted in the groove (12). A spring (14) is connected between the inner end of the protective plate (13) and the bottom surface of the groove (12). The outer end of the protective plate (13) is designed to extend out of the groove (12) to cover the U-shaped notch (2) when the U-shaped lug (3) is hanging outside. The end of the U-shaped lug that abuts against the U-shaped lug is bent outward towards the cavity wall plate (1) to form a slanted top fold (1301). The slanted top fold (1301) is lower than the outer plate surface of the cavity wall plate (1), and the groove opening of the groove (12) is provided with a chamfer for accommodating the slanted top fold (1301).

2. The self-concealing folding lug device according to claim 1, characterized in that: When the U-shaped lug (3) is in a lying position, the torsion spring (10) still has the remaining force to suppress the U-shaped lug (3) from automatically springing up.

3. The self-concealing folding lug device according to claim 1, characterized in that: The base (4) is fixed with a central locking block (9) and two side blocks (6) symmetrically arranged on both sides of the central locking block (9). The central locking block (9) and the side blocks (6) are respectively provided with threaded holes and insertion holes on the same axis. A rotating shaft (5) is inserted into the insertion hole of each side block (6). A torsion spring (10) is sleeved on the outer end of the rotating shaft (5). The inner end of the rotating shaft (5) is provided with an external thread adapted to be screwed into the threaded hole. The bottom ends of the two vertical support sections of the U-shaped lifting lug (3) are respectively movably inserted into the gap between the two side blocks (6) and the central locking block (9). The bottom end of the vertical support section is provided with a rotating hole adapted to be rotated through the corresponding shaft of the rotating shaft (5).

4. The self-concealing folding lug device according to claim 3, characterized in that: The outer wall of the side block (6) is provided with a positioning screw hole with a vertically connected insertion hole, and the shaft (5) is provided with a positioning ring groove corresponding to the positioning screw hole. A safety screw (7) for abutting the bottom of the positioning ring groove is adapted to be screwed into the positioning screw hole.

5. The self-concealing folding lug device according to claim 3, characterized in that: A wear-resistant bushing is installed in the drill hole.

6. The self-concealing folding lug device according to claim 1, characterized in that: The base (4) is provided with a limiting block (8) in front of it, which corresponds to the inner ear surface (302) of the U-shaped hanging ear (3) when lying down; the upper surface of the limiting block (8) is provided with a buffer pad.

7. The self-concealing folding lug device according to claim 1, characterized in that: The outer surface of the cavity wall plate (1) is detachably fitted with a detachable positioning plate for abutting the inner ear surface (302) of the U-shaped hanging lug (3) when in the external hanging state.

8. The self-concealing folding lug device according to claim 1, characterized in that: The bottom end of the support section extends outward from the side of the outer ear surface (301) of the U-shaped hanging lug (3) to form a first limiting part (303). The base (4) is provided with a second limiting part that can correspond to and abut against the first limiting part (303), so that the U-shaped hanging lug (3) has a rotation limit from the lying state to the hanging state.

9. The self-concealing folding lug device according to claim 1, characterized in that: The outer surface of the cavity wall plate (1) is provided with a set screw hole that extends through the groove of the cavity (12), and the set screw hole is provided with a countersunk screw (11) for screwing on the protective plate (13).

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