Portable chariot simulator

Abstract

The invention provides a portable chariot simulator, and relates to the technical field of chariot simulation, the portable chariot simulator comprises a support frame, an outer frame plate, a visual device, an operation simulation device, a portable power supply and a moving part, the outer frame plate is arranged outside the support frame, a handle is arranged on the outer frame plate, the moving part is arranged at the lower part of the support frame, and the visual device is arranged on the moving part. The supporting frame comprises an upper frame and a lower frame, the visual device is arranged in the upper frame in a foldable mode, the portable power source is arranged in the lower frame, and the operation simulation device is detachably arranged in the lower frame through a fixing part. The operation simulation device interacts with the visual device to achieve chariot simulation operation. According to the technical scheme, the technical problem that an existing chariot simulator is large in overall size and not easy to flexibly select a training field is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of combat vehicle simulation, and in particular to a portable combat vehicle simulator. Background Art

[0002] A tank simulator is a device used to simulate the operation and combat scenarios of tanks (such as tanks and armored vehicles). It is usually used in military training and tactical exercises to improve the skills and response capabilities of soldiers and commanders when using tanks. Tank simulators play an important role in modern military. Through highly realistic virtual training environments, realistic operating interfaces and operating feel, they effectively improve the combat capabilities and response capabilities of soldiers and commanders, providing them with a safe and realistic training experience.

[0003] Although the existing tank simulators can simulate tanks to train soldiers, they are large in size and have high requirements on the factory floor space and environment. A single vehicle model cannot meet the training requirements of all trainers, and multiple tank simulators cannot be used in coordinated operations, resulting in unsatisfactory training results. Summary of the invention

[0004] The present invention provides a portable combat vehicle simulator to solve the technical problem that the existing combat vehicle simulator has a large overall size and is not easy to flexibly select a training site. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0005] To achieve the above-mentioned objectives, the present invention provides a portable tank simulator, comprising: a supporting frame, an outer frame plate, a visual device, an operation simulation device, a portable power source and a moving part, wherein the outer frame plate is arranged outside the supporting frame, a handle is arranged on the outer frame plate, the moving part is arranged at the lower part of the supporting frame, the supporting frame comprises an upper frame and a lower frame, the visual device is foldably arranged in the upper frame, the portable power source is arranged in the lower frame, the operation simulation device is detachably arranged in the lower frame through a fixing part, and the operation simulation device interacts with the visual device to realize the tank simulation operation.

[0006] Optionally, the support frame includes a plurality of frame rods connected end to end, and dovetail grooves are provided on inner sides of the frame rods.

[0007] Optionally, a detachable frame crossbeam is arranged between adjacent frame rods on both sides and the rear side of the lower frame, a dovetail groove is arranged on the surface of the frame crossbeam, and the operation simulation device is connected to the frame crossbeam via its fixing portion.

[0008] Optionally, a detachable middle crossbeam is provided between the frame crossbeams on both sides of the lower frame, and the operation simulation device includes a driving control device, and the driving control device includes a steering wheel control device, and the steering wheel control device is detachably connected to the middle crossbeam through its fixing part.

[0009] Optionally, the steering wheel operating device includes a steering wheel, a connecting shaft, a connecting and fixing plate, a starting lever oscillator, a spring, a gear assembly and a photoelectric encoder which are arranged in sequence, the connecting shaft is arranged on the connecting and fixing plate, the steering wheel is connected to the gear assembly via the connecting shaft, the gear assembly is connected to the photoelectric encoder, the photoelectric encoder transmits the rotation signal of the steering wheel to the visual device, the starting lever oscillator is coaxially connected to the connecting shaft, a protruding push rod is arranged at the bottom of the starting lever oscillator, the spring is connected between the protruding push rod and the connecting and fixing plate to provide a return torque for the steering wheel, and a fixing portion is arranged on the connecting and fixing plate, which is connected to the middle cross beam through the fixing portion.

[0010] Optionally, the driving control device also includes a throttle and brake control device, and a gear control device. The throttle and brake control device are fixed to the bottom of the lower frame, and the gear control device is a paddle-type gear device, which is arranged on the rear side of the steering wheel.

[0011] Optionally, the operation simulation device further comprises a shooting operation device, and the shooting operation device is detachably connected to the frame crossbeam at the rear side of the lower frame through its fixing portion.

[0012] Optionally, the viewing device is a three-screen folding viewing device, and the bottom of the three-screen folding viewing device is fixedly mounted on the upper side of the bottom of the upper frame.

[0013] Optionally, the outer frame plate includes a top mounting plate, a rear side mounting plate and a front mounting plate, the front mounting plate is fixed to the front side of the support frame, and the top mounting plate and the rear side mounting plate are connected to the front mounting plate via overlap buckles.

[0014] Optionally, retractable legs are provided at both ends of the inner side of the front mounting plate, the handle is a portable pull-out rod, the portable pull-out rod is provided on the rear side surface of the rear side enclosure mounting plate, and the movable part is a castor with brake provided at the bottom of the support frame.

[0015] The technical solution of the present invention may include the following beneficial effects:

[0016] The portable tank simulator provided by the present invention realizes tank operation simulation by arranging a visual device and an operation simulation device in the upper frame and the lower frame respectively, and realizes tank operation simulation through the interaction between the operation simulation device and the visual device, and facilitates the carrying and transfer deployment of the entire tank simulator by integrating the operation simulation device and the visual device in the support frame, and the arrangement of the handle and the moving part on the outer frame plate facilitates the movement of the tank simulator, and the tank simulator of this scheme requires a small space, and can realize the deployment of multiple simulators at the same time to realize the coordinated combat simulation of multiple tank simulators. It can be seen that the portable tank simulator of this scheme solves the technical problem that the existing tank simulator has a large overall size and is not easy to flexibly select training sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of the internal structure of a portable combat vehicle simulator according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a portable combat vehicle simulator according to an embodiment of the present invention;

[0020] Figure 3 is another structural schematic diagram of a portable combat vehicle simulator according to an embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the driving simulation state of the portable combat vehicle simulator according to an embodiment of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the shooting simulation state of the portable combat vehicle simulator according to an embodiment of the present invention;

[0023] Figure 6 2 is a schematic structural diagram of a steering wheel control device of a portable combat vehicle simulator according to an embodiment of the present invention;

[0024] Figure 7 It is a schematic structural diagram of the front mounting plate of the portable combat vehicle simulator according to an embodiment of the present invention in an unfolded state.

[0025] In the figure: 1. support frame; 2. visual device; 3. driving control device; 4. shooting operation device; 5. portable power supply; 11. portable pull-out rod; 12. top mounting plate; 13. embedded handle; 14. overlapping buckle; 15. front mounting plate; 151. retractable legs; 16. castors with brakes; 17. fixed mounting plate; 18. frame crossbeam; 19. rear side panel mounting plate; 20. middle crossbeam; 31. steering wheel control device; 32. throttle and brake control device; 33. gear control device; 311. steering wheel; 312. connecting shaft; 313. connecting fixed plate; 314. starter lever oscillator; 315. gear assembly; 316. spring; 317. photoelectric encoder; 318. steering wheel control device fixing part; 331. paddle gear; 332. sensor. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0028] like Figures 1 to 3 As shown, the present invention provides a portable tank simulator, comprising: a supporting frame 1, an outer frame plate, a visual device 2, an operation simulation device, a portable power source 5 and a moving part, wherein the outer frame plate is arranged outside the supporting frame 1, a handle is arranged on the outer frame plate, the moving part is arranged at the lower part of the supporting frame 1, the supporting frame 1 comprises an upper frame and a lower frame, the visual device 2 is foldably arranged in the upper frame, the portable power source 5 is arranged in the lower frame, the operation simulation device is detachably arranged in the lower frame through a fixing part, and the operation simulation device interacts with the visual device to realize the tank simulation operation.

[0029] Specifically, by respectively arranging the visual device 2 and the operation simulation device in the upper frame and the lower frame, the visual device 2 provides the trainees with a highly immersive three-dimensional visual scene, and the tank operation simulation is realized through the interaction between the operation simulation device and the visual device. Moreover, by integrating the operation simulation device and the visual device 2 in the support frame, it is convenient to carry and transfer the entire tank simulator. The portable power supply 5 is arranged in the lower frame and fixed inside the support frame through the mounting frame to supply power to the internal equipment of the simulator. The arrangement of the handle and the moving part on the outer frame plate facilitates the movement of the tank simulator, and the tank simulator of this scheme requires a small space, and multiple simulators can be deployed at the same time to realize the coordinated combat simulation of multiple tank simulators, thereby improving the professional technical ability and coordinated combat ability of the troops.

[0030] As an optional embodiment, the support frame 1 includes a plurality of frame rods connected end to end, and dovetail grooves are provided on the inner sides of the frame rods.

[0031] Specifically, the support frame 1 is formed by overlapping frame rods, and the connecting ends of the frame rods are fixedly connected by screws. Preferably, the frame rods are set as dovetail aluminum profiles, and the sides located inside the support frame 1 are set as dovetail groove structures to facilitate the detachable installation and fixation of the operation simulation device. Upper frame cross beams are respectively set between the upper parts of the frame rods located on the two sides, and fixed mounting plates 17 are set on the upper frame cross beams. The upper frame cross beams and the fixed mounting plates 17 set the support frame as an upper frame and a lower frame.

[0032] As an optional embodiment, a detachable frame crossbeam 18 is provided between adjacent frame rods on both sides and the rear side of the lower frame, a dovetail groove is provided on the surface of the frame crossbeam 18, and the operation simulation device is connected to the frame crossbeam 18 via its fixing portion.

[0033] Specifically, the frame crossbeam 18 and the frame rod are detachably connected via a dovetail groove, and the position of the frame crossbeam 18 can be adjusted according to actual needs to facilitate adjustment of the position of the operation simulation device, so that the position of the operation simulation device can be adjusted in the storage state and the use state.

[0034] As an optional embodiment, a detachable middle cross beam 20 is arranged between the frame cross beams 18 on both sides of the lower frame, and the operation simulation device includes a driving control device 3, and the driving control device 3 includes a steering wheel control device 31, and the steering wheel control device 31 is detachably connected to the middle cross beam 20 through its fixing part.

[0035] Specifically, the operation simulation device includes a driving control device 3, and the driving control device 3 includes a steering wheel control device 31. In order to store the steering wheel control device 31, an intermediate cross beam 20 is set in the lower frame. The intermediate cross beam 20 is detachably connected between the frame cross beams 18 on both sides to facilitate the adjustment of the position of the steering wheel control device 31.

[0036] As an optional implementation, Figure 6 As shown, the steering wheel operating device 31 includes a steering wheel 311, a connecting shaft 312, a connecting and fixing plate 313, a starting rod oscillator 314, a spring 316, a gear assembly 315 and a photoelectric encoder 317 which are arranged in sequence. The connecting shaft 312 is arranged on the connecting and fixing plate 313. The steering wheel 311 is connected to the gear assembly 315 through the connecting shaft 312. The gear assembly 315 is connected to the photoelectric encoder 317. The photoelectric encoder 317 transmits the rotation signal of the steering wheel 311 to the visual device 2. The starting rod oscillator 314 is coaxially connected to the connecting shaft 312. A protruding push rod is arranged at the bottom of the starting rod oscillator 317. The spring 316 is connected between the protruding push rod and the connecting and fixing plate 313 to provide a aligning torque for the steering wheel 311. A fixing portion 318 is arranged on the connecting and fixing plate 313, and is connected to the middle cross beam 20 through the fixing portion 318.

[0037] Specifically, the steering wheel control device 31 is installed on the middle cross beam 20 and is inside the support frame 1 when not in training. When performing driving simulation training, the steering wheel control device 31 can be quickly installed on the frame rod on the front side of the support frame 1 by removing the middle cross beam 20 at its fixed position as a whole, such as Figure 4 The steering wheel control device 31 mainly consists of a steering wheel 311, a connecting shaft 312, a connecting fixing plate 313, a pneumatic rod swinger 314, a gear assembly 315, a spring 316 and a photoelectric encoder 317. The driver applies a torque to the steering wheel 311, which is transmitted to the photoelectric encoder 317 via the gear assembly 315, and a steering signal of the steering wheel 311 can be output in real time and transmitted to the visual device 2. The spring 316 is used to provide the steering resistance torque of the steering wheel 311.

[0038] As an optional embodiment, the driving control device 3 also includes a throttle and brake control device 32 and a gear control device 33. The throttle and brake control device 32 is fixed to the bottom of the lower frame, and the gear control device 33 is a paddle-type gear device, which is arranged on the rear side of the steering wheel 311.

[0039] Specifically, the accelerator and brake operating device 32 is installed at the lower part of the lower frame by screws. The gear operating device 33 adopts a paddle-type gear design. The paddle-type gear device 331 is fixedly installed behind the steering wheel 311, including a paddle on the left side for downshifting and a paddle on the right side for upshifting. When the trainee operates the paddle, an electrical signal is transmitted to the visual device 2 via the sensor 332, instructing it to perform a gear shift operation.

[0040] As an optional embodiment, the operation simulation device further comprises a shooting operation device 4, and the shooting operation device 4 is detachably connected to the frame crossbeam 18 at the rear side of the lower frame through its fixing portion.

[0041] Specifically, the shooting operation device 4 and the steering wheel control device 31 are both modularly designed. The shooting operation device 4 is located inside the support frame 1 when not in training. When performing shooting simulation training, the shooting operation device 4 can be quickly installed on the front frame rod of the support frame 1 by completely removing the frame crossbeam 18 at the fixed position thereof. Figure 5 As shown. The installation position can be adaptively adjusted according to different vehicle models. The shooting operation device 4 and the visual device 2 enable the trainees to interact directly and naturally with the environment. It can provide timely tactical data and training feedback to help trainers make real-time adjustments during the training process.

[0042] According to the training requirements, the present invention selects one of the driving control device 3 and the shooting operation device 4 to be installed on the front frame rod of the support frame 1, which can be used as a driving simulator or a shooting simulator. Multiple portable tank simulators can be used for coordinated combat to cultivate the overall coordination ability of armored vehicle combat.

[0043] As an optional implementation, the viewing device 2 is a three-screen folding viewing device, and the bottom of the three-screen folding viewing device is fixedly mounted on the upper side of the bottom of the upper frame.

[0044] Specifically, the visual device 2 provides the trainees with an immersive virtual environment, and at the same time enables the user to directly interact with the environment through the driving control device 3 and the shooting operation device 4. The visual device 2 uses a three-screen folding portable machine, which is fixedly mounted on the bottom of the upper frame through the screw holes at the bottom, that is, mounted on the fixed mounting plate 17. The three screens of the three-screen folding portable machine can be folded, unfolded, and the angles can be adjusted as needed.

[0045] As an optional embodiment, the outer frame plate includes a top mounting plate 12, a rear side mounting plate 19 and a front mounting plate 15, the front mounting plate 15 is fixed to the front side of the support frame, and the top mounting plate 12 and the rear side mounting plate 19 are connected to the front mounting plate 15 via overlap buckles 14.

[0046] Specifically, by arranging an outer frame plate including a top mounting plate 12, a rear side mounting plate 19 and a front side mounting plate 15 on the outside of the support frame 1, the appearance of the tank simulator of this scheme is set to a suitcase-type structure. The main frame of the support frame 1 is formed by overlapping a dovetail aluminum profile structure. The number and relative position relationship of the frame rods can be adaptively adjusted according to actual training requirements. The outer side of the frame rod is a peripheral fixing plate installed by countersunk screws, wherein the front side mounting plate 15 is fixed to the peripheral fixing plate of the frame rod by screws, and the top mounting plate 12 and the rear side mounting plate 19 are connected to the front side mounting plate 15 by overlapping buckles 14, which can be quickly disassembled. The top mounting plate 12 is in a dismantled state during training and can be placed on the ground in reverse to provide a placement platform for items carried by trainees, such as recording paper, water cups, etc.

[0047] As an optional embodiment, retractable legs 151 are provided at both ends of the inner side of the front mounting plate 15, the handle is a portable pull-out rod 11, the portable pull-out rod 11 is provided on the rear side of the rear side enclosure mounting plate 19, and the movable part is a caster 16 with a brake provided at the bottom of the support frame.

[0048] Specifically, the tank simulator of this solution adopts a suitcase-like design in appearance, with four braked casters 16 installed at the bottom, a portable pull-out rod 11 installed on the rear side, and built-in handles 13 installed on both sides. A single trainer can move the portable tank simulator through the braked casters 16 and the portable pull-out rod 11, and two trainers can also change the position of the simulator through the portable pull-out rod 13. Figure 7 As shown, the front mounting plate 15 is composed of foldable legs and a seat surface. In the training state, the front mounting plate 15 is removed, and the foldable legs are opened, so that the chair can be used as a portable chair.

[0049] The technical solution of the present invention has the following beneficial effects:

[0050] 1. The appearance adopts a suitcase-like design, integrating the visual device and the operation simulation device into the support frame, with casters with brakes installed at the bottom and a portable pull-out rod installed on the rear side. It can be quickly deployed and moved to different training venues to adapt to various environments for training. This flexibility allows training to be carried out in a variety of environmental conditions without relying on fixed training facilities.

[0051] 2. The main frame of the tank simulator is built with dovetail aluminum profiles. All training equipment is fixed on the aluminum profile frame. The overlap combination of aluminum profiles can be increased or decreased according to training needs to adapt to different vehicle models for training. In the training state, the top mounting plate can be removed and placed on the ground in reverse to provide a placement platform for the trainees' carry-on items; the front mounting plate can be removed and its internal folding legs can be opened to use it as a portable seat. In this way, the various components that could have been used independently are integrated into one, which does not damage the structural strength and allows for convenient and quick functional operations.

[0052] 3. The driving control device and the shooting control device are installed inside the tank simulator. Both devices are modularly designed and fixed inside the support frame. According to the training requirements, one of the driving control device and the shooting control device can be installed at the designated position of the support frame. It can be used as both a driving simulator and a shooting simulator. One simulator can realize two different training functions, effectively reducing the training cost.

[0053] 4. The visual device provides trainees with an immersive virtual environment, and at the same time enables trainees to interact directly and naturally with the environment through driving control devices and shooting control devices. The visual device can also provide timely tactical data and training feedback to help trainees make real-time adjustments during training, which helps improve training results and response capabilities. At the same time, it provides a real control interface and control feel, allowing operators to practice various operations such as driving and shooting.

[0054] 5. According to training requirements, multiple portable tank simulators can be used for coordinated operations to cultivate the overall coordination ability of armored vehicle combat.

[0055] 6. This solution realizes the integrated design of electrical equipment. The power supply of the equipment comes from the internally installed portable power supply. No external wiring is required. The cables are arranged along the aluminum profile frame to ensure that the simulator wiring is completed internally. The appearance is simple and beautiful.

[0056] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A portable combat vehicle simulator, characterized in that: include: A support frame, an outer frame plate, a visual device, an operation simulation device, a portable power source and a moving part, wherein the outer frame plate is arranged outside the support frame, a handle is arranged on the outer frame plate, the moving part is arranged at the lower part of the support frame, the support frame includes an upper frame and a lower frame, the visual device is foldably arranged in the upper frame, the portable power source is arranged in the lower frame, the operation simulation device is detachably arranged in the lower frame through a fixing part, and the operation simulation device interacts with the visual device to realize the chariot simulation operation.

2. The portable combat vehicle simulator according to claim 1, characterized in that: The support frame comprises a plurality of frame rods connected end to end, and dovetail grooves are arranged on the inner sides of the frame rods.

3. The portable combat vehicle simulator according to claim 2, characterized in that: A detachable frame crossbeam is arranged between adjacent frame rods on both sides and the rear side of the lower frame, a dovetail groove is arranged on the surface of the frame crossbeam, and the operation simulation device is connected with the frame crossbeam through its fixing part.

4. The portable combat vehicle simulator according to claim 3, characterized in that: A detachable middle cross beam is arranged between the frame cross beams on both sides of the lower frame. The operation simulation device comprises a driving control device, and the driving control device comprises a steering wheel control device. The steering wheel control device is detachably connected to the middle cross beam through its fixing part.

5. The portable combat vehicle simulator according to claim 4, characterized in that: The steering wheel operating device includes a steering wheel, a connecting shaft, a connecting and fixing plate, a starting rod oscillator, a spring, a gear assembly and a photoelectric encoder which are arranged in sequence. The connecting shaft is arranged on the connecting and fixing plate. The steering wheel is connected to the gear assembly via the connecting shaft. The gear assembly is connected to the photoelectric encoder. The photoelectric encoder transmits the rotation signal of the steering wheel to the visual device. The starting rod oscillator is coaxially connected to the connecting shaft. A protruding push rod is arranged at the bottom of the starting rod oscillator. The spring is connected between the protruding push rod and the connecting and fixing plate to provide a self-aligning torque for the steering wheel. A fixing portion is arranged on the connecting and fixing plate and is connected to the middle cross beam via the fixing portion.

6. The portable combat vehicle simulator according to claim 5, characterized in that: The driving control device also includes a throttle and brake control device and a gear control device. The throttle and brake control devices are fixed to the bottom of the lower frame. The gear control device is a paddle-type gear device and is arranged at the rear side of the steering wheel.

7. The portable combat vehicle simulator according to claim 6, characterized in that: The operation simulation device also includes a shooting operation device, which is detachably connected to the frame crossbeam at the rear side of the lower frame through its fixing portion.

8. The portable combat vehicle simulator according to claim 7, characterized in that: The viewing device is a three-screen folding viewing device, and the bottom of the three-screen folding viewing device is fixedly mounted on the upper side of the bottom of the upper frame.

9. The portable combat vehicle simulator according to any one of claims 1 to 8, characterized in that: The outer frame plate includes a top mounting plate, a rear side mounting plate and a front mounting plate. The front mounting plate is fixed to the front side of the support frame. The top mounting plate and the rear side mounting plate are connected to the front mounting plate via overlapping buckles.

10. The portable combat vehicle simulator according to claim 9, characterized in that: Retractable legs are arranged at both ends of the inner side of the front mounting plate, the handle is a portable pull-out rod, the portable pull-out rod is arranged on the rear side of the rear side enclosure mounting plate, and the movable part is a caster with a brake arranged at the bottom of the support frame.

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