A connection structure for the fuselage and tail of a wooden model airplane that allows for quick assembly and disassembly.

Abstract

A connection structure for the fuselage and tail of a wooden model aircraft that facilitates quick assembly and disassembly relates to the field of aircraft model component technology. The structure comprises two main parts: a truss-type tail boom and a tail fin mounting bracket. The main body of the truss-type tail boom is a wooden truss structure with a connecting box at the front and a connecting box slot at the rear, the outer wall of which is glued with carbon fiber reinforcement plates. The tail fin mounting bracket is also a wooden truss structure. The connecting box at its front is used to connect the tail boom, and pre-drilled holes on the outer side of the bracket are used to connect the horizontal stabilizer and vertical stabilizer. A servo mounting component is glued to its bottom. This invention achieves efficient assembly and disassembly through the connecting box design. After disassembly, the components can be stored separately, significantly improving portability. It also allows for quick replacement of individual faulty parts, significantly reducing maintenance costs. Furthermore, it balances overall lightweight design with structural stability, exhibits excellent re-assembly and disassembly performance, and extends the overall lifespan of the model aircraft.

Description

Technical Field

[0001] This invention belongs to the field of aviation model parts technology, specifically relating to a connection structure for the fuselage and tail of a wooden model aircraft that is easy to assemble and disassemble quickly. It is applicable to various civilian wooden model aircraft, wooden model aircraft for competitions, and wooden model aircraft made by enthusiasts. It is especially suitable for scenarios where there are high requirements for the portability and maintenance efficiency of the connection between the fuselage and tail. The core solution is to quickly connect, separate, and replace the fuselage and tail of a wooden model aircraft. Background Technology

[0002] As an important medium for leisure, entertainment, competitive events, and aviation science popularization, the connection structure between the fuselage and tail of model aircraft directly determines the user experience, maintenance costs, and flight safety. The tail plays a crucial role in balancing flight attitude and adjusting flight trajectory, and the rationality and practicality of the connection structure, as the core connecting component between the fuselage and tail, are of paramount importance.

[0003] The existing methods for connecting the fuselage and tail of wooden model airplanes generally have many defects, with the core problem being the unreasonable design of the connection structure:

[0004] 1. Fixed connection method and difficult disassembly: Most wooden model airplanes use glue or other methods to fix the fuselage and tail fin together. Once the connection structure is formed, it cannot be disassembled. If disassembly is required, special equipment such as glue solvents are needed. The operation is cumbersome and time-consuming, which is not only extremely inefficient, but also easily damages the base material of the wooden fuselage or tail fin, resulting in secondary damage to the parts.

[0005] 2. Poor portability and high transportation risk: The traditional connecting structure is fixed to the fuselage and tail, making the overall size of the model aircraft large and difficult to fit into a small carrying bag, and inconvenient to store after outdoor flight. During long-distance transportation, the integrated structure is prone to deformation and loosening of the connecting parts due to collisions and compression, and may even cause the tail to fall off, seriously affecting the performance of the model aircraft;

[0006] 3. High maintenance costs and insufficient emergency adaptability: During model aircraft flight, the connecting structure is easily damaged by impacts. Existing connecting structures require breaking the overall adhesive bond to replace parts, which is not only difficult to operate but may also damage the fuselage or tail section, leading to a significant increase in maintenance costs. In emergency scenarios such as model aircraft competitions and outdoor flights, the inability to quickly replace the connecting structure or tail section directly affects flight plans or competition results.

[0007] While some existing technologies attempt to adopt modular designs, they still fail to address the core pain points of tool dependence and time-consuming assembly and disassembly. Furthermore, they do not combine the lightweight advantages of wood with the mechanical properties of truss structures, making it difficult to simultaneously meet the dual requirements of rapid disassembly and structural strength. Therefore, developing a wooden model aircraft tail fin that is efficient to assemble and disassemble and structurally robust has become an urgent technical problem to be solved in this field. Summary of the Invention

[0008] The core objective of this invention is to overcome the shortcomings of existing wooden model aircraft fuselage and tail connection structures, which rely on tools for disassembly and assembly, are time-consuming, have poor portability, and are inconvenient to maintain. This invention provides a connection structure for wooden model aircraft fuselage and tail that is easy to disassemble and assemble quickly, achieving efficient disassembly and assembly, convenient storage of individual parts, and quick replacement of faulty components. At the same time, it takes into account the lightweight nature of wooden structures and the high stability of truss structures, and is suitable for the material characteristics and usage scenarios of wooden model aircraft.

[0009] To achieve the above objectives, the specific technical solution of the present invention is as follows: A connection structure for a wooden model aircraft fuselage and tail fin that is easy to assemble and disassemble quickly, comprising a truss-type tail boom and a tail fin mounting bracket. The front end of the truss-type tail boom is provided with a tail boom front end connection box, and the rear end of the tail boom is provided with a tail boom rear end connection box groove. A carbon fiber plate is bonded to the outer wall of the connection box groove. The truss-type tail boom is assembled from horizontal and vertical wooden boards of the tail boom through a mortise and tenon structure.

[0010] The tail fin mounting bracket is connected to the tail boom rear end connecting box slot of the truss tail boom via the front connecting box of the mounting bracket. The tail fin mounting bracket is assembled from the horizontal and vertical wooden boards of the mounting bracket through a mortise and tenon structure. The tail fin mounting bracket has pre-drilled screw holes for mounting the horizontal and vertical tail fins. The bottom of the tail fin mounting bracket is glued with a servo mounting component, which is reserved for the installation of servos.

[0011] Furthermore, the front end connecting box of the mounting bracket is embedded in the rear end connecting box groove of the tail rod and fixed with screws passing through the reserved screw holes.

[0012] Furthermore, a carbon fiber plate is bonded to the outer wall of the tail rod rear end connecting box groove by means of adhesive bonding. The carbon fiber plate completely covers the stress area where the front end connecting box of the mounting bracket and the rear end connecting box groove of the tail rod are in contact.

[0013] Furthermore, both the tail rod front end connecting box and the mounting bracket front end connecting box adopt a wooden connecting box structure. It consists of four connecting boxes forming a whole. Each connecting box is composed of a connecting box top cover and four connecting box side plates fixed by mortise and tenon structure. The side plates are provided with screw holes corresponding to the screw holes on the connecting box groove.

[0014] Furthermore, the tail rod rear end connecting box groove is composed of two connecting box groove partitions and four connecting box groove side plates. The two connecting box groove partitions are fixed by a mortise and tenon structure in a cross shape, and are glued to the four connecting box groove side plates by a mortise and tenon structure. Screw holes for connecting the grooves to the connecting box are provided on the side plates.

[0015] The shape and size of the connector box slot are adapted to the connector box.

[0016] Furthermore, in the mortise and tenon structure of the truss-type tail boom, tail wing mounting bracket, tail boom front end connecting box, and mounting bracket front end connecting box, the tenon and mortise are fitted together and then fixed by adhesive.

[0017] Furthermore, the horizontal wooden board of the tail rod, the vertical wooden board of the tail rod, the horizontal wooden board of the mounting frame, and the vertical wooden board of the mounting frame are all made of perforated board.

[0018] The beneficial effects of this invention are as follows: Disassembly and assembly efficiency is improved by an order of magnitude; an innovative connection box is used for connection, requiring only common tools such as screwdrivers throughout the process. Portability is greatly optimized; after disassembly, it can be broken down into independent components such as the truss-type tail boom, horizontal tail, vertical tail, and tail wing mounting bracket, which can be easily placed into a small carrying bag, significantly reducing the difficulty of transportation and storage and avoiding damage to components during handling.

[0019] Significantly improved maintenance convenience allows for quick disassembly and replacement of individual faulty components without disassembling the entire structure, greatly reducing maintenance costs and operational difficulty. This is particularly suitable for emergency replacements at model aircraft competitions and for handling malfunctions during outdoor flights. High reusability is ensured; the quick-release structure uses screw connections, allowing for repeated disassembly and assembly, extending the overall lifespan of the tail section. Balancing strength and lightweight design, the wooden truss structure of the truss-type tail boom maintains excellent mechanical stability while ensuring lightweight construction. Carbon fiber reinforcement plates further enhance the strength of key stress areas. The quick-release structure is made of high-strength materials, ensuring structural stability during flight and meeting the stress requirements of medium to large-sized model aircraft. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall diagram of the connection structure of the present invention.

[0022] Figure 2 This is a structural diagram of the truss-type tailstock of the present invention.

[0023] Figure 3 This is a structural diagram of the tail fin mounting bracket of the present invention.

[0024] Figure 4 This is a structural diagram of a single connecting box of the present invention.

[0025] Figure 5 This is a structural diagram of the connecting box groove of the present invention.

[0026] Figure 6This is a schematic diagram of the connection structure and tail fin assembly of the present invention.

[0027] In the diagram: 1. Truss-type tail boom; 11. Tail boom front connector box; 111. Connector box top cover; 112. Connector box side plate; 113. Screw holes for connecting the connector box and the slot; 12. Tail boom horizontal wooden board; 13. Tail boom vertical wooden board; 14. Carbon fiber plate; 15. Tail boom rear connector box slot; 151. Connector box slot partition; 152. Connector box slot side plate; 153. Screw holes for connecting the slot and the connector box; 2. Tail fin mounting bracket; 21. Mounting bracket front connector box; 22. Mounting bracket horizontal wooden board; 23. Mounting bracket vertical wooden board; 24. Screw holes for connecting the mounting bracket and the vertical stabilizer; 25. Screw holes for connecting the mounting bracket and the horizontal stabilizer; 26. Servo mount; 3. Horizontal stabilizer; 4. Vertical stabilizer; Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0029] A connection structure for a wooden model aircraft fuselage and tail fin that is easy to assemble and disassemble quickly includes two main parts: a truss-type tail boom and a tail fin mounting bracket. Each part can be quickly separated and reassembled through a special quick-release structure. The tail fin mounting bracket is connected to the tail of the truss-type tail boom through a wooden connecting box structure.

[0030] The device includes a truss-type tail boom with a wooden connecting box and a connecting box slot, bonded with carbon fiber reinforcement plates; and a tail fin mounting bracket connected to the tail boom's tail section, comprising a connecting box, servo mounting components, and screw holes for tail fin mounting. The truss-type tail boom is a wooden truss structure, consisting of at least two vertical wooden planks and four horizontal wooden planks connected and fixed via mortise and tenon joints. The wooden connecting box is a rectangular frame structure, consisting of a top cover and four side panels fixed via mortise and tenon joints. The side panels have screw holes corresponding to the screw holes on the connecting box slot. The tail end of the truss-type tail boom has a connecting box slot for inserting the connecting box and connecting it to the wooden connecting box with screws. The connecting box slot consists of two partitions and four side panels. The two partitions are fixed via mortise and tenon joints in a cross shape and are glued to the four side panels via mortise and tenon joints. The shape and size of the connecting box slot are adapted to the connecting box.

[0031] A carbon fiber reinforcing plate is glued to the outer wall of the connecting box groove to enhance the stress strength of the outer wall of the connecting box groove; the carbon fiber reinforcing plate is attached and fixed to the stress-bearing surface of the outer wall of the wooden connecting box groove.

[0032] The tail fin mounting bracket is a wooden truss structure. It is connected to the truss tail boom by inserting the front connecting box into the connecting box slot at the rear of the truss tail boom. The outer side of the tail fin mounting bracket has reserved screw holes for connecting the horizontal stabilizer and the vertical stabilizer, enabling immediate assembly and disassembly of the tail fin components. It is fixed by at least two vertical wooden boards and four horizontal wooden boards through a mortise and tenon structure, with reserved screw holes for installing the horizontal stabilizer and the vertical stabilizer. The servo mounting component is glued to the bottom of the tail fin mounting bracket, with reserved space for servo installation.

[0033] The tail end of the truss-type tail rod is provided with a connecting box groove that is adapted to the wooden connecting box. The wooden connecting box is embedded in the connecting box groove and fixed by screws passing through the reserved screw holes.

[0034] The carbon fiber reinforcing plate completely covers the stress area where the wooden connecting box and the truss tail rod are attached, and is pressed and fixed to the outer wall of the connecting box groove by adhesive bonding.

[0035] The tail fin mounting bracket is connected to the truss-type tail boom via a connecting box structure.

[0036] The wooden connecting box structure consists of four connecting boxes forming a whole. Each connecting box is composed of a top cover and four side panels fixed together by mortise and tenon joints. The side panels are provided with screw holes corresponding to the screw holes on the connecting box groove.

[0037] In the mortise and tenon structure of the truss tail rod, the tail wing mounting bracket and the associated wooden connecting box, the tenon and mortise are fitted together and then fixed by adhesive.

[0038] Example 1

[0039] like Figures 1 to 3 As shown, the connection structure for the wooden model aircraft fuselage and tail fin of the present invention, which facilitates quick assembly and disassembly, includes two main parts: a truss-type tail boom and a tail fin mounting bracket. Each component can be quickly separated and reassembled through a special quick-release structure. It includes a truss-type tail boom 1, with a tail boom front-end connection box 11 at the front end. The truss-type tail boom 1 is assembled from a tail boom horizontal wooden board 12 and a tail boom vertical wooden board 13 through a mortise and tenon structure. The truss-type tail boom 1 has a connection box groove 15 at the rear end, and a carbon fiber plate 14 is glued to the outer wall of the connection box groove 15. The tail fin mounting bracket 2 is connected to the truss-type tail boom 1 through a mounting bracket front-end connection box 21. The tail fin mounting bracket 2 is assembled from a mounting bracket horizontal wooden board 22 and a mounting bracket vertical wooden board 23 through a mortise and tenon structure. A servo mounting component 26 is glued to the bottom of the tail fin mounting bracket 2 for servo installation.

[0040] In this embodiment, the material selection for all components takes into account both the lightweight and structural strength requirements of the model aircraft. Unless otherwise specified, all wooden components are made of lightweight basswood plywood, and the basswood plywood is cut using laser cutting technology. All adhesives used for connection are environmentally friendly woodworking glue for model aircraft or 502 glue, and all fasteners are screws and nuts.

[0041] Furthermore, the truss-type tail boom 1 is a wooden truss structure, and its preparation and assembly method is as follows: Select lightweight linden wood plywood of suitable thickness, and process the tail boom horizontal wood board 12 and tail boom vertical wood board 13 respectively through laser cutting process. Process mortises at preset positions on the tail boom horizontal wood board 12, and process tenons that are precisely matched with the mortises on the four sides of the tail boom vertical wood board 13. Insert the tenons of the tail boom vertical wood board 13 into the mortises of the tail boom horizontal wood board 12 to form a cross-supported truss structure. Apply glue evenly at the mortise and tenon joints to ensure the overall mechanical stability of the truss and prevent the rods from loosening or falling off during flight.

[0042] Furthermore, the truss-type tail boom 1 has a tail boom front end connection box 11 at its front end and a tail boom rear end connection box groove 15 at its rear end. The tail boom front end connection box 11 is a cuboid frame structure, and its outer wall is laser-processed with screw holes 113. The hole positions match the preset installation positions on the model aircraft fuselage connection box groove. The tail boom front end connection box 11 is glued to the front end of the truss-type tail boom 1 using a tenon and mortise structure. After curing, it forms a quick-release interface for connection with the fuselage. The groove of the tail boom rear end connection box groove 15 is glued to the rear end of the truss-type tail boom 1 using a tenon and mortise structure. Its shape is adapted to the shape of the mounting frame front end connection box 21. A carbon fiber plate 14 is glued to the outer wall of the tail boom rear end connection box groove 15. The shape of the carbon fiber plate 14 is completely matched with the outer wall of the connection box groove. The high strength characteristics of the carbon fiber material enhance the stress strength of the connection box groove and avoid deformation of the groove due to repeated disassembly and assembly or flight impact.

[0043] Furthermore, both the tail rod front end connecting box 11 and the mounting bracket front end connecting box 21 are integral connecting box structures composed of four connecting boxes, with each connecting box being a cuboid frame structure, such as... Figure 4 As shown, it is composed of a top cover 111 of the connecting box and four side plates 114 of the connecting box, which are fixed by mortise and tenon structure. The side plates are laser-cut with screw holes 113 corresponding to the screw holes on the connecting box groove.

[0044] Furthermore, the connecting box groove 15 is composed of two connecting box groove partitions 151 and four connecting box groove side plates 152. The two partitions are fixed by a mortise and tenon structure in a cross shape, and are glued to the four side plates by a mortise and tenon structure. Screw holes 153 are laser-processed at corresponding positions on the side plates. The shape and size of the connecting box groove are adapted to the connecting box.

[0045] Furthermore, the specific structure and connection method of the tail fin mounting bracket 2 are as follows: Figure 3 As shown, the tail wing mounting bracket 2 adopts the same manufacturing process as the truss tail boom 1. The horizontal wooden board 22 and the vertical wooden board 23 of the tail boom are connected by mortise and tenon joints and glued to form a wooden truss structure. The front end connecting box 21 of the mounting bracket is a cuboid structure made of linden wood plywood. Its outer wall is machined with screw holes corresponding to the connecting box groove 15 at the rear end of the tail boom. It is glued to the front end of the tail wing mounting bracket 2 by mortise and tenon joints. The outer side of the tail wing mounting bracket 2 has pre-set screw holes 25 and 24, which correspond one-to-one with the holes at the connecting ends of the horizontal tail 3 and the vertical tail 4, respectively.

[0046] Furthermore, the servo mounting component 26 is a 3D printed part, adapted to the size of conventional model aircraft servos, and glued to the bottom of the tail fin mounting bracket 2 at a preset position. The mounting component has reserved servo fixing holes to ensure that the output shaft and the tail fin control structure are accurately connected after the servo is installed, without any jamming.

[0047] Furthermore, the quick-release connection method between the tail wing mounting bracket 2 and the horizontal stabilizer 3 and vertical stabilizer 4 is as follows: align the connecting end of the horizontal stabilizer 3 with the preset positions on the left and right sides of the tail wing mounting bracket 2, align the through hole of the horizontal stabilizer 3 with the screw hole 25 of the mounting bracket, insert the screw and nut and tighten them, gently push the horizontal stabilizer 3 to confirm that there is no shaking, and the installation is complete. The installation method of the vertical stabilizer 4 is the same as that of the horizontal stabilizer 3.

[0048] Furthermore, the quick-release connection method between the truss-type tail boom 1 and the tail wing mounting bracket 2 is as follows: Hold the assembled tail wing mounting bracket 2 by hand, align the front end connecting box 21 of the mounting bracket with the rear end connecting box groove 15 of the tail boom, and slowly insert it along the axis of the groove until the end face of the connecting box is in contact with the bottom of the groove. At this time, the screw holes of the mounting bracket connecting box are completely aligned with the holes 153 of the connecting box groove. Insert the screws and nuts and tighten them clockwise to fix the two. To disassemble, unscrew the screws counterclockwise and pull the tail wing mounting bracket 2 outward along the axis to achieve quick separation.

[0049] Furthermore, the quick-release connection method between the truss-type tail boom 1 and the model aircraft fuselage is as follows: Align the front end connecting box 11 of the tail boom with the rear end connecting box groove of the fuselage, and slowly insert it along the axis of the groove until the end face of the connecting box is in contact with the bottom of the groove. At this time, the screw hole 113 of the front end connecting box of the tail boom is completely aligned with the hole of the rear end connecting box groove of the fuselage. Insert the screw and nut and tighten them to complete the fixation. When disassembling, only the screw and nut need to be unscrewed to remove the tail boom from the fuselage without disassembling other structures of the fuselage.

[0050] It should be noted that the connection relationship between the servo motor and the tail control structure, the installation method of the receiver, battery and other model aircraft electronic components in this invention are all existing technologies in the field of model aircraft. Their specific structures and connection logic will not be elaborated. The size and style of the horizontal tail 3 and the vertical tail 4 can be adjusted according to the requirements of the model aircraft number. The length of the truss tail boom 1 can be achieved by adding or subtracting truss units with tenon and mortise connections. None of these affect the core technical effect of this invention.

[0051] In this embodiment, the truss structure connected by mortise and tenon joints ensures the lightweight and mechanical stability of the tail boom. The carbon fiber reinforcement plate enhances the strength of key stress-bearing parts. The coordinated design of multiple sets of quick-release screws and the connecting box structure enables quick assembly and disassembly. After disassembly, it can be broken down into independent parts for easy storage and transportation. Individual faulty parts can be replaced separately, greatly reducing maintenance costs and fully meeting the needs of model aircraft enthusiasts for daily use, emergency competitions, and long-distance transportation.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connecting structure of a wooden model airplane fuselage and tail wing which is convenient for quick assembly and disassembly, characterized in that, The application relates to a tail boom (1) and a tail wing mounting frame (2), wherein the front end of the tail boom (1) is provided with a tail boom front end connecting box (11), the tail end of the tail boom (1) is provided with a tail boom rear end connecting box slot (15), and the outer wall of the tail boom rear end connecting box slot (15) is bonded with a carbon fiber plate (14); the tail boom (1) is assembled by tail boom horizontal wood plates (12) and tail boom vertical wood plates (13) through a mortise and tenon structure. The front end of the tail wing mounting frame (2) is provided with a mounting frame front end connecting box (21), the tail end of the tail wing mounting frame (2) is provided with a tail end sealing plate, the tail wing mounting frame (2) is connected with the tail boom rear end connecting box slot (15) of the tail boom (1) through the mounting frame front end connecting box (21), the tail wing mounting frame (2) is assembled by mounting frame horizontal wood plates (22) and mounting frame vertical wood plates (23) through a mortise and tenon structure, the mounting frame vertical wood plate (23) at the tail end of the tail wing mounting frame (2) is the tail end sealing plate, screw hole positions for mounting a horizontal tail and a vertical tail are reserved on the mounting frame horizontal wood plates (22), and the bottom of the tail wing mounting frame (2) is bonded with a rudder mounting piece (26) reserved for mounting a rudder.

2. The quick detachable wooden model airplane fuselage and tail wing connecting structure according to claim 1, characterized in that, The mounting frame front end connecting box (21) is embedded into the tail boom rear end connecting box slot (15) and is fixed by penetrating through the reserved screw hole positions with screws.

3. The quick detachable wooden model airplane fuselage and tail wing connecting structure according to claim 1, characterized in that, The outer wall of the tail boom rear end connecting box slot (15) is provided with the carbon fiber plate (14) through a bonding mode, and the carbon fiber plate (14) completely covers the stress area of the mounting frame front end connecting box (21) and the tail boom rear end connecting box slot (15).

4. The quick detachable wooden model airplane fuselage and tail wing connecting structure of claim 1, wherein, The tail boom front end connecting box (11) and the mounting frame front end connecting box (21) are both wood connecting box structures, which are composed of four connecting boxes, a single connecting box is composed of a connecting box top cover (11) and four connecting box side plates (112) fixed through a mortise and tenon structure, and the side plates are provided with screw hole positions corresponding to the screw hole positions of the connecting box slot.

5. The quick detachable wooden model airplane fuselage and tail wing connecting structure of claim 1, wherein: The tail boom rear end connecting box slot (15) is composed of two connecting box slot partition plates (151) and four connecting box slot side plates (152), the two connecting box slot partition plates (151) are fixed through a mortise and tenon structure and cross each other, and are bonded with the four connecting box slot side plates (152) through a mortise and tenon structure; the side plates are provided with slot connecting screw hole positions (153); The connecting box slot is matched with the connecting box in shape and size.

6. The quick detachable wooden model airplane fuselage and tail wing connecting structure of claim 1, wherein In the mortise and tenon structures of the tail boom (1), the tail wing mounting frame (2), the tail boom front end connecting box (11) and the mounting frame front end connecting box (21), the tenon is matched and embedded with the mortise, and is fixed after embedding through glue curing.

7. The quick detachable wooden model airplane fuselage and tail wing connecting structure of claim 1, wherein The tail boom horizontal wood plates (12), the tail boom vertical wood plates (13), the mounting frame horizontal wood plates (22) and the mounting frame vertical wood plates (23) all adopt hollow plates.

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