Multi-layer unmanned target drone transport frame

Abstract

The utility model belongs to the technical field of unmanned target drone auxiliary transportation equipment, and particularly relates to a multi-layer unmanned target drone transportation frame. The device comprises a chassis bracket and an upper-layer bracket, at least two upper-layer brackets are arranged up and down; the upper-layer bracket adjacent to the chassis bracket is detachably connected to the chassis bracket; the adjacent upper-layer brackets are detachably connected; wing locking devices used for fixing wings are connected to the two sides of the chassis bracket and the two sides of the upper-layer bracket respectively; and the chassis bracket and the upper-layer bracket are connected with front and back fulcrum locking mechanisms for limiting the front and back movement and jumping of the unmanned target drone on the rack vehicle. A plurality of unmanned target drones are stored in a limited space, the space utilization rate is improved, centralized management and scheduling of the unmanned target drones are facilitated, the time for searching and carrying the target drones is shortened, and the efficiency of daily maintenance, overhaul, training and other work is improved. According to the utility model, the target drone is effectively prevented from being damaged due to shaking, collision and the like in the transportation process.

Description

Technical Field

[0001] This utility model belongs to the technical field of unmanned target drone auxiliary transportation equipment, specifically relating to a multi-layer unmanned target drone transportation frame. Background Technology

[0002] The development and progress of unmanned target drones in China is currently rapid. With continuous advancements in unmanned target drone technology, including flight control, navigation systems, stealth technology, and formation flight capabilities, modern unmanned target drones can realistically simulate the characteristics of 3rd and 4th generation fighter jets and cruise missiles, possessing real-time data sharing and multi-drone networking formation capabilities. As the intensity and frequency of military training increase globally, the proportion of live-fire target training has risen significantly, leading to a year-on-year increase in the consumption of unmanned target drones. The issue of bulk transportation of unmanned target drones has become a crucial and urgent problem for every unmanned target drone manufacturer. Utility Model Content

[0003] This utility model provides a multi-layer unmanned target drone transport rack. One of its objectives is to provide a device that can solve the problems of parking, storing and transporting unmanned target drones. Another objective is to provide a device that can store multiple unmanned target drones in a limited space, improve space utilization, and facilitate centralized management and scheduling of unmanned target drones.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A multi-layer unmanned target drone transport frame includes a chassis bracket and an upper bracket; at least two upper brackets are arranged vertically; the upper bracket adjacent to the chassis bracket is detachably connected to the chassis bracket; adjacent upper brackets are detachably connected to each other; wing lockers for fixing wings are connected to both sides of the chassis bracket and the upper bracket; both the chassis bracket and the upper bracket are connected to front and rear fulcrum locking mechanisms for limiting the forward and backward movement and jumping of the unmanned target drone on the frame.

[0006] The wing locking device includes an upper latch and a lower latch; the upper latch and the lower latch are connected to the side wall of the chassis bracket or the upper bracket in a corresponding manner.

[0007] The upper and lower buckles are wrapped with PU polyurethane material; EVA foam is fixed on the contact surfaces of the upper and lower buckles with the wing.

[0008] The upper and lower buckles are designed to match the contact surfaces of the wing with the wing airfoil.

[0009] The chassis bracket includes four bracket locking devices, a rectangular frame, four first legs, four load-bearing casters, a front support plate, and a rear support plate. The four first legs are vertically connected to the four corners of the upper surface of the rectangular frame. The four load-bearing casters are connected to the four corners of the lower surface of the rectangular frame. The front support plate and the rear support plate are connected between two oppositely arranged first legs. The four bracket locking devices are respectively fixedly connected to the upper part of the four first legs for connecting and fixing the chassis bracket to the upper bracket. The front and rear fulcrum locking mechanisms are connected to the front support plate and the rear support plate.

[0010] The front and rear support plates are provided with an arc-shaped groove at the top center that matches the contact area of ​​the unmanned target drone; each of the first legs is a hollow rectangular steel pipe with a strip-shaped opening in the vertical direction on one side wall for inserting the front and rear support plates. On the lower part of the adjacent two side walls of the side wall where the strip-shaped opening is located on each hollow rectangular steel pipe, there are through holes for inserting quick-release pins.

[0011] The upper bracket includes four second legs, bracket inserts, and crossbars. The four second legs are vertically arranged and connected in pairs by crossbars, forming a rectangular frame structure. Each pair of opposite crossbars has a vertically connected support plate, the top of which has a groove matching the bottom of the unmanned target drone. Each second leg is a hollow rectangular steel pipe with a bracket insert connected to its bottom. The outer diameter of the bracket insert matches the hollow inner diameter of the second leg. The bracket insert has a through hole for inserting a quick-release pin. Wing lockers are connected to the outer walls of the four second legs. Bracket lockers are connected to the upper part of the outer walls of the four second legs. Each support plate is connected to a front and rear fulcrum locking mechanism.

[0012] One of the four second legs has a strip-shaped opening on one side wall in the vertical direction for inserting a tray. A through hole is opened on the lower part of the adjacent two side walls of the side wall where the strip-shaped opening on the hollow rectangular steel pipe is located. The through hole is used for inserting a quick-release pin.

[0013] The front and rear fulcrum locking mechanism includes a fulcrum base, a fulcrum buckle, a bayonet shaft, and a safety pin. The fulcrum base is an L-shaped structure composed of a rectangular plate and a rectangular block structure. The rectangular plate has through holes for connecting with the support plate. A U-shaped groove is opened at the top center of the rectangular block structure. The two opposite side walls of the U-shaped groove have symmetrical grooves, and each groove has corresponding connecting through holes on its two opposite side walls. A bayonet shaft is connected to the two through holes of one groove, and the fulcrum buckle is rotatably connected to the bayonet shaft and located inside the groove. A safety pin is inserted into the two through holes of the other groove.

[0014] The fulcrum buckle is a long strip-shaped structure with through holes at both ends. One through hole is used for rotational connection with the bayonet shaft, and the other through hole is used for insertion of the safety pin.

[0015] Beneficial effects:

[0016] Improved space utilization: This utility model adopts a multi-layer design, which can park and store multiple unmanned target drones in a relatively small area, effectively saving space, and is especially suitable for places with limited space.

[0017] Improved work efficiency: This utility model can arrange unmanned target drones in an orderly manner on a multi-layer transport rack, making it easier for operators to quickly find the required target drones, reducing the time spent searching for and moving target drones, improving the efficiency of daily maintenance, repair and training, and making the scheduling of unmanned target drones more convenient and efficient.

[0018] Protecting the target drone's safety: Each layer of the bracket in this utility model has a special fixing device that can firmly fix the unmanned target drone on the multi-layer transport frame, effectively preventing damage to the target drone caused by shaking, collision, etc. during transportation, and ensuring the safety and integrity of the unmanned target drone.

[0019] Convenient and flexible transportation: The mobile device equipped with this utility model makes it easy to transport the unmanned target drone to the designated location.

[0020] Reduced management costs: This utility model centralizes the storage and management of unmanned target drones, facilitating unified maintenance, upkeep, and monitoring, reducing the dispersed investment of manpower and resources, and lowering management costs.

[0021] Highly customizable: This utility model can be customized according to different models, sizes and quantities of unmanned target drones to meet various specific needs.

[0022] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an assembly diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the multi-layer structure assembly of this utility model.

[0026] Figure 3 This is a schematic diagram of the upper frame structure of this utility model.

[0027] Figure 4 This is a schematic diagram of the mobile chassis structure of this utility model.

[0028] Figure 5 This is a schematic diagram of the front and rear support fixing device of the unmanned target drone of this utility model.

[0029] Figure 6 This is a diagram showing the operational status of this utility model.

[0030] The components include: 1. Unmanned target drone; 2. Rope tensioner; 3. Wing; 4. Upper bracket; 5. Chassis bracket; 6. Bracket locking device; 7. Lifting ring; 8. Load-bearing casters; 9. Front support plate; 10. Quick-release pin; 11. Rear support plate; 12. Wing locking device; 13. Bracket insert rod; 14. Pivot base; 15. Pivot buckle; 16. Bayonet pivot; 17. Safety pin; 18. Rectangular frame; 19. First leg; 20. U-shaped groove; 21. Groove; 22. Second leg; 23. Crossbar; 24. Front and rear pivot locking mechanism. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example:

[0033] according to Figures 1-6 The multi-layer unmanned target drone transport frame shown includes a chassis bracket 5 and an upper bracket 4; at least two upper brackets 4 are arranged vertically; the upper bracket 4 adjacent to the chassis bracket 5 is detachably connected to the chassis bracket 5; adjacent upper brackets 4 are detachably connected to each other; wing lockers 12 for fixing the wings are respectively connected to both sides of the chassis bracket 5 and the upper bracket 4; both the chassis bracket 5 and the upper bracket 4 are connected to front and rear fulcrum locking mechanisms 24 for limiting the forward and backward movement and jumping of the unmanned target drone on the frame.

[0034] In actual use, the unmanned target drone 1 can be transported by a multi-layer unmanned target drone transport frame. After arriving at the operating site, the upper bracket 4 and the chassis bracket 5 of the multi-layer transport frame are separated and evenly distributed. The unmanned target drone 1 is placed on the upper bracket 4 and the chassis bracket 5 respectively, and the indoor assembly and pre-flight preparation work can be carried out immediately. The transport frame can be used as an indoor test frame.

[0035] This utility model adopts a multi-layer design, which can park and store multiple unmanned target drones 1 in a relatively small area, effectively saving space and is especially suitable for places with limited space.

[0036] This invention can arrange unmanned target drones 1 in an orderly manner on a multi-layer transport rack, making it easier for operators to quickly find the required target drones, reducing the time spent searching for and transporting target drones, improving the efficiency of daily maintenance, repair and training, and making the scheduling of unmanned target drones more convenient and efficient.

[0037] This invention provides centralized storage and management of unmanned target drones, facilitating unified maintenance, upkeep, and monitoring, reducing the dispersed investment of manpower and resources, and lowering management costs.

[0038] This invention can be customized according to different models, sizes and quantities of unmanned target drones to meet various specific needs.

[0039] In some embodiments, the wing locking device 12 includes an upper latch and a lower latch; the upper latch and the lower latch are connected to the side wall of the chassis bracket 5 or the upper bracket 4 in a corresponding manner.

[0040] Before transportation, the drone wing is placed on the wing locking device 12. The drone wing is then securely placed on the side wall of the multi-layer drone transport frame by upper and lower locking devices. After arriving at the operating site, the wing is removed from the wing locking device 12, and relevant operations can be carried out. This avoids damage to the wing during transportation and reduces the transportation volume.

[0041] Furthermore, the upper and lower buckles are wrapped with PU polyurethane material; EVA foam is fixed on the contact surfaces of the upper and lower buckles with the wing 3. This technical solution avoids damage to the paint surface when the wing locking device 12 contacts the wing.

[0042] In some embodiments, the contact surfaces of the upper and lower latches with the wing match the airfoil shape of the wing 3. This technical solution ensures that the wing 3 is tightly fitted with the upper and lower latches during transportation, greatly reducing the chance of damage to the wing 3.

[0043] In practical applications, the lower buckle can be fixedly connected to the side wall of the chassis bracket 5 or the upper bracket 4. After the wing 3 is placed on the lower buckle, the upper buckle is fixed to the matching upper buckle base with screws. The upper buckle base is fixed on the chassis bracket 5 or the upper bracket 4 and is positioned above the lower buckle. With the cooperation of the lower and upper buckles, the wing 3 can be transported safely and stably.

[0044] In some embodiments, the chassis bracket 5 includes four bracket locking devices 6, a rectangular frame 18, four first support legs 19, four load-bearing casters 8, a front support plate 9, and a rear support plate 11; the four first support legs 19 are vertically connected to the four corners of the upper surface of the rectangular frame 18; the four load-bearing casters 8 are connected to the four corners of the lower surface of the rectangular frame 18; the front support plate 9 and the rear support plate 11 are connected between two oppositely arranged first support legs 19; the four bracket locking devices 6 are respectively fixedly connected to the upper part of the four first support legs 19 for connecting and fixing the chassis bracket 5 and the upper bracket 4; the front and rear fulcrum locking mechanisms 24 are connected to the front support plate 9 and the rear support plate 11.

[0045] Furthermore, the top center of the front support plate 9 and the rear support plate 11 is provided with an arc-shaped groove that matches the contact part of the unmanned target drone; each of the first legs 19 is a hollow rectangular steel pipe, and one of its side walls has a strip-shaped opening in the vertical direction for inserting the front support plate 9 and the rear support plate 11. At the lower part of the adjacent two side walls of each hollow rectangular steel pipe where the strip-shaped opening is located, there are through holes for inserting quick-release pins 10.

[0046] In practical use, the load-bearing casters 8 equipped in this technical solution facilitate the transportation of the unmanned target drone 1 to the designated location. To ensure absolute safety, each load-bearing caster 8 in this embodiment can bear a weight of 1200 kg, and the load-bearing casters 8 provide rotation direction and braking function for the chassis bracket 5. The front tray 9 and rear tray 11 conform to the shape of the parts that contact the unmanned target drone 1, providing support for the unmanned target drone 1 and ensuring that the unmanned target drone 1 is stably and reliably placed on the chassis bracket 5.

[0047] In practical use, the bracket insert 13 on the upper bracket 4 is inserted into the first support leg 19. To make the connection between the upper bracket 4 and the first support leg 19 more stable, the quick-release pin 10 is inserted into the through hole on the first support leg 19 and the bracket insert 13, connecting the upper bracket 4 and the chassis bracket 5 together. The quick-release pin 10 is used to limit the vertical movement of each bracket and is a backup for the bracket locking device 6. When the transportation route is long, the quick-release pin 10 is used to avoid damage to the unmanned target drone caused by transportation failure due to the failure of the bracket locking device 6. The front support plate 9 and the rear support plate 11 are inserted into the slots of the front support plate 9 and the rear support plate 11. For better connection stability, they can be fixed with screws. The front and rear pivot locking mechanism 24 fixes the unmanned target drone 1 to the first support leg 19.

[0048] In some embodiments, the upper bracket 4 includes four second legs 22, bracket inserts 13, and crossbars 23. The four second legs 22 are vertically arranged and connected in pairs by crossbars 23 to form a rectangular frame structure. A pair of opposite crossbars 23 are vertically connected to a support plate, and the top of the support plate has a groove that matches the bottom of the unmanned target drone 1. Each second leg 22 is a hollow rectangular steel pipe, and a bracket insert 13 is connected to its bottom. The outer diameter of the bracket insert 13 matches the hollow inner diameter of the second leg 22. The bracket insert 13 has a through hole for inserting a quick-release pin 10. A wing locker 12 is connected to the outer side wall of each of the four second legs 22. A bracket locker 6 is connected to the upper part of the outer side wall of the four second legs 22. A front and rear fulcrum locking mechanism 24 is connected to each support plate.

[0049] Furthermore, one of the four second legs 22 has a strip-shaped opening in the vertical direction on one side wall for inserting a tray, and a through hole is opened at the lower part of the adjacent two side walls of the side wall where the strip-shaped opening on the hollow rectangular steel pipe is located. The through hole is used to insert the quick-release pin 10.

[0050] In practical use, multiple upper brackets 4 can be installed as needed, generally two to three are preferable. Specifically, the upper bracket 4 is inserted into the second leg 22 of the lower upper bracket 4 or the first leg 19 of the chassis bracket 5 via bracket insert rods 13. For long-distance transportation, quick-release pins 10 are used to make the connection more stable.

[0051] The bracket locking device 6 in this embodiment uses a latch lock, which is a technology known in the prior art. In practical applications, any latch lock that can connect and lock the chassis bracket 5 and the upper bracket 4, or adjacent upper brackets 4, can be used.

[0052] In some embodiments, the front and rear fulcrum locking mechanism 24 includes a fulcrum base 14, a fulcrum buckle 15, a bayonet shaft 16, and a safety pin 17. The fulcrum base 14 is an L-shaped structure composed of a rectangular plate and a rectangular block structure. The rectangular plate has through holes for connecting with the support plate. A U-shaped groove 20 is opened at the top center of the rectangular block structure. Grooves 21 are symmetrically opened on the two opposite side walls of the U-shaped groove. Each groove 21 has corresponding connecting through holes on its two opposite side walls. The bayonet shaft 16 is connected to the two through holes of one groove 21. The fulcrum buckle 15 is rotatably connected to the bayonet shaft 16 and located in the groove 21. The safety pin 17 is inserted into the two through holes of the other groove 21.

[0053] In practical applications, the pallet can be made of wood, and the rectangular plate on the fulcrum base 14 is connected to the wooden pallet by nails through through holes in the rectangular plate. The fulcrum base 14 can be an L-shaped integrated structure composed of a rectangular plate and a rectangular block structure.

[0054] Furthermore, the fulcrum buckle 15 is a long strip-shaped structure with through holes at both ends. One through hole is used for rotational connection with the bayonet shaft 16, and the other through hole is used for insertion of the safety pin 17.

[0055] In actual use, the fulcrum base 14 is fixedly connected to the upper bracket 4 and the tray on the chassis bracket 5. The fulcrum latch 15 rotates around the latch shaft 16 to open and close the fulcrum latch 15. After locking the front and rear fulcrums of the unmanned target drone 1, the fulcrum latch 15 rotates in the opposite direction around the latch shaft 16 to close the fulcrum latch 15. The safety pin 17 is inserted into the fulcrum base 14 to keep the fulcrum latch 15 in a closed state. The front and rear fulcrum locking mechanism 24 not only restricts the front and rear movement of the unmanned target drone 1 on the upper bracket 4 and the chassis bracket 5, but also restricts the jumping of the unmanned target drone 1 relative to the upper bracket 4 and the chassis bracket 5.

[0056] To ensure safe and stable transport of the unmanned target drone under various conditions, rope tensioners 2 and lifting rings 7 are connected to the side walls of the upper bracket 4 and the chassis bracket 5. The rope tensioners 2 and lifting rings 7 work together to further secure the unmanned target drone 1 on the upper frame, preventing it from moving up and down during transport. The rope tensioners 2 and lifting rings 7 can also be used to connect to external structures to prevent swaying of the upper bracket 4 and the chassis bracket 5.

[0057] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.

[0058] It should be noted that all directional indicators in this embodiment are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0059] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0060] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-layer unmanned target transport frame, characterized in that: It includes a chassis bracket (5) and an upper bracket (4); there are at least two upper brackets (4) arranged vertically; the upper bracket (4) adjacent to the chassis bracket (5) is detachably connected to the chassis bracket (5); the adjacent upper brackets (4) are detachably connected; the chassis bracket (5) and the upper bracket (4) are respectively connected to wing lockers (12) for fixing the wings; the chassis bracket (5) and the upper bracket (4) are both connected to front and rear fulcrum locking mechanisms (24) for limiting the forward and backward movement and jumping of the unmanned target drone on the vehicle.

2. The multi-layer unmanned target transport frame as described in claim 1, characterized in that: The wing locking device (12) includes an upper latch and a lower latch; the upper latch and the lower latch are connected to the side wall of the chassis bracket (5) or the upper bracket (4) respectively.

3. The multi-layer unmanned target transport frame as described in claim 2, characterized in that: The upper and lower buckles are wrapped with PU polyurethane material; EVA foam is fixed on the contact surfaces of the upper and lower buckles with the wing.

4. A multi-layer unmanned target transport frame as described in claim 2 or 3, characterized in that: The upper and lower buckles are designed to match the contact surfaces of the wing with the wing airfoil.

5. A multi-layer unmanned target transport frame as described in claim 1, characterized in that: The chassis bracket (5) includes four bracket locking devices (6), a rectangular frame (18), four first legs (19), four load-bearing casters (8), a front support plate (9), and a rear support plate (11); the four first legs (19) are vertically connected to the four corners of the upper surface of the rectangular frame (18); the four load-bearing casters (8) are connected to the four corners of the lower surface of the rectangular frame (18); the front support plate (9) and the rear support plate (11) are connected between the two oppositely arranged first legs (19); the four bracket locking devices (6) are respectively fixedly connected to the upper part of the four first legs (19) for connecting and fixing the chassis bracket (5) and the upper bracket (4); the front and rear fulcrum locking mechanism (24) is connected to the front support plate (9) and the rear support plate (11).

6. The multi-layer unmanned target transport frame as described in claim 5, characterized in that: The front support plate (9) and the rear support plate (11) are provided with an arc-shaped groove at the top middle position that matches the contact part of the unmanned target drone; each of the first legs (19) is a hollow rectangular steel pipe with a strip-shaped opening in the vertical direction on one side wall for inserting the front support plate (9) and the rear support plate (11). On the hollow rectangular steel pipe, there are through holes at the lower part of the two side walls adjacent to the side wall where the strip-shaped opening is located, and the through holes are used to insert quick release pins (10).

7. A multi-layer unmanned target transport frame as described in claim 1, characterized in that: The upper bracket (4) includes four second legs (22), bracket inserts (13), and crossbars (23). The four second legs (22) are vertically arranged and connected to each other by crossbars (23) to form a rectangular frame structure. Each pair of opposite crossbars (23) is vertically connected to a support plate, and the top of the support plate has a groove that matches the bottom of the unmanned target drone. Each second leg (22) is a hollow rectangular steel pipe with a bracket insert (13) connected to its bottom. The outer diameter of the bracket insert (13) matches the hollow inner diameter of the second leg (22). The bracket insert (13) has a through hole for inserting a quick-release pin (10). The outer walls of the four second legs (22) are connected to wing lockers (12). The upper part of the outer walls of the four second legs (22) is connected to a bracket locker (6). Each support plate is connected to a front and rear fulcrum locking mechanism (24).

8. A multi-layer unmanned target transport frame as described in claim 7, characterized in that: The four second legs (22) have a strip opening in the vertical direction on one side wall for inserting the tray. On the lower part of the two adjacent side walls of the side wall where the strip opening is located on each hollow rectangular steel pipe, there are through holes for inserting quick release pins (10).

9. A multi-layer unmanned target transport frame as described in claim 1, 5, or 7, characterized in that: The front and rear fulcrum locking mechanism (24) includes a fulcrum base (14), a fulcrum buckle (15), a bayonet shaft (16), and a safety pin (17). The fulcrum base (14) is an L-shaped structure composed of a rectangular plate and a rectangular block structure. The rectangular plate has through holes for connecting with the support plate. A U-shaped groove (20) is opened in the middle of the top of the rectangular block structure. Grooves (21) are symmetrically opened on the two opposite side walls of the U-shaped groove (20). Each groove (21) has corresponding connecting through holes on the two opposite side walls. A bayonet shaft (16) is connected in the two through holes of one groove (21). The fulcrum buckle (15) is rotatably connected to the bayonet shaft (16) and located in the groove (21). A safety pin (17) is inserted in the two through holes of the other groove (21).

10. A multi-layer unmanned target transport frame as described in claim 9, characterized in that: The fulcrum buckle (15) is a long strip plate structure with through holes at both ends. One through hole is used for rotational connection with the bayonet shaft (16), and the other through hole is used for insertion of the safety pin (17).

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