The subject of the sample specimen is a movable display mounting console that offers a solution for Computer Vision Syndrome (CVS), a symptom group arising from the increasingly frequent use of displays, monitors and other flat picture tools, by altering the distance between the user's eyes and the display in various patterns.

Using a computer is a basic requirement for most types of work these days. Workplaces where a computer or display was not needed in the past are now using these appliances. Employees often spend as much as 8 to 10 hours a day working in front of a computer. Nowadays, the threat is no longer the radiation from a display, but the stress on our eyes. Moreover, electronic devices with displays are increasingly prevalent in entertainment and in after-hours activities as well. Computer Vision Syndrome (CVS) is the most common health problem in office workers that may occur even with 2 hours of watching a display every day. According to various studies, 50 to 80 % of employees working with a computer are affected by such issues from time to time. People with known vision disorders or those wearing glasses may experience more serious symptoms, but sometimes it is the display in particular that causes the problems to surface. When we focus on a proximal object, we use several different muscles. The ciliary muscle changes the shape of the lens in the eye so that we can focus on a nearby object (for example, on the display). Other muscles (12 altogether in the two eyes) turn the eyes towards each other, or move them left and right, or up and down, to focus on a single spot or to move simultaneously, and to achieve proper coordination. It is very exhausting for the eyes to gaze in the same direction and distance for a long time. Stress is especially common when we look at nearby objects, such as a computer display, because it requires the constant activity of the ciliary muscle. Extended periods of adaptation cause the ciliary muscle to cramp and contract. The eye becomes temporarily myopic and the image of distant objects becomes dim. This is usually accompanied by headaches and exhaustion, and the examined object seems more distant and smaller than it really is. Since the eye muscles are under a constant and uniform stress, this becomes stressful after a while. In such cases, distal vision may become worse for some time. This is called a spasm of accommodation or adaptation, which can last for as long as 30 to 60 minutes after work has ended. The spasm of accommodation is the cramping of the ciliary muscle, the "freezing" of the eye's external muscles, causing functional myopia (pseudomyopia) where the ciliary muscle is unable to relax even when looking at a distant object. The person experiences myopia, which may lead to crossed eyes in the long run. It affects mostly those who focus to short distances frequently, read often, or work on the computer. As the eyes become exhausted, refocusing from the paper to the display - and back - becomes slow, causing the person in front of the display to often lose track of the work, which in turn slows down work and increases the chances of errors. When focusing on the display for long periods of time, they may have trouble seeing clearly objects that are far away. These symptoms clearly indicate the stress of the eyes. When someone spends their time in front of a computer day in and day out, their vision may deteriorate even with the best settings. Short-sightedness is rapidly increasing: estimates indicate that 25 percent of the world's population may be suffering from myopia and this increasing trend does not show signs of slowing. Harmful consequences even more seriously affect children. One of the reasons is that their fine eye movements are not yet completely established, while they also lack the consciousness to avoid gazing at the screen for hours on end. When the eyes are forced to keep focusing proximally, the muscles may lose their flexibility due to continued focus on nearby objects. "Displays will make issues such as astigmatism, short-sightedness (myopia), long-sightedness (hypermetropia) and latent deviation of the eyes (heterophoria) to emerge."

To alleviate the above symptoms, recommendations include the resting of the eyes and a change in focus during work, e.g., "looking" through closed eyes or focusing on a distant object. Patent databases also include attempts for a solution from various aspects. One of them is the Australian patent named 'AU2015252114 (Al) - LOW-POWER EYEWEAR FOR REDUCING SYMPTOMS OF COMPUTER VISION SYNDROME', which addresses, on the one hand, the stress of the eyes resulting from dryness due to infrequent blinking when the person is immersed in an activity (22 blinks per minute reduced to as little as 7), reducing the dryness by applying a tightly enclosed frame of glasses, while reducing the stress on the eyes with glasses ranging from +0.1 to +0.25 in dioptres and various surfaces. The Chinese patent titled '€N 102566676 (A) - Anti-radiation eye-protectio computer screen' applies a convex lens filled with water in front of the display to reduce radiation and prevent electrostatic dusts from being transferred, while the convex lens also displays a clearer and softer image. The patent 'US201 1007265 (Al ) - .Honeycomb Coating; Melanin Lens and Manufacturing Process Thereof recommends glasses lenses with honeycomb pattern and melanin coating that will relieve the ciliary muscle and the eye lens from stress by reducing the stray scattered light reaching the eyes, while also reducing dryness in the eyes. The American pattern titled 'US2007171360 (Al) - DYNAMIC MULTIFOCAL SPECTACLE FRAME' takes a standard bifocal lens and attaches to it a dynamic frame fitted with a lens for intermediate vision, ideal for a computer display distance between near and distant vision, thus reducing stress on the eyes, and where the dynamic frame can be set aside when not in use. The patent called 'US2007171364 (Al) - Method of relieving computer vision syndrome' introduces a method that uses regularly displayed on-screen signs and messages to prompt the user to conduct exercises that reduce the symptoms, including eye exercises that run on the screen. Patent 'LIS6210000 (B l ) - Apparatus, system, and method for preventing computer vision syndrome' also recommends an enclosed frame for eyeglasses incorporating signal lights, a humidity detector, thermometer, blink detector, and speakers. When the frequency of blinking decreases, or the eye becomes dryer, the device indicates to the user the need to blink and reduces the chances of dryness in the enclosed area around the eyes. A separate device to increase air humidity within the eyeglasses may also be used. The British patent 'GB2427952 (A) - Apparatus for preventing visual impairment' applies a transmitter for infrared wavelengths on the head and a receiver on the computer display, and a clock measures the time that the person's head is directed at the screen. When it reaches a set duration, the device signals the user to take a break. The patent called ¹ FR2690620 (Al ) - Training

screen coloured, respectively, red and green and observed by user wearing spectacles with red and green filters' also uses protective eyewear along with a display suitable to produce a colour image. The protective eyewear includes various colour filtering lenses while the screen displays bicolour moving images. Since the two eyes see differing moving images, the eye and the brain are forced to engage in activities that provide relaxation compared to a monotonous focusing.

The devices and processes listed above typically do not discuss the stress caused by the constant focal length, while the methods that demand conscious effort from the user, and even distract them from their work in which they are engaged, usually results in the user considering the external circumstance that causes them to stop work as a nuisance, and they may voluntarily abandon these methods. Also, some of the devices using eyeglasses are uncomfortable.

Equipment for mounting displays in use are frequently static consoles with 1 to 2 degrees of freedom of movement, but there also specific, motorised solutions that can move the display along an axis perpendicular to the screen plane to arbitrary degrees. Such a solution is shown in the Chinese pattern ' CN 102767679 (A) - Automatic rotating device for display screens of desktop computers'. The advantage of this extra function is that the display, which is typically a rectangle, can be adjusted to various tasks in standing or lying positions.

Our objective was to create a device that ensures the varying stress, and thereby the relaxation, of the ciliary muscle without the intervention and disturbance of the user or without causing forced interruptions.

Our solution is based on the insight that focal length varies along with the changes in distance between the screen or display (hereinafter: display) and the eyes; therefore, from the point of view of the users, the more comfortable solution is to change the location of the display, either gradually in small steps or with a slow continuous change, thereby eliminating the static eye muscle position, or to even exercise the eyes, unnoticed by the user, by changing the focus and the angle of the shaft. Moving the display is practically achieved when the connecting surface mounting the display is engaged in an alternating motion compared to the base unit in a direction perpendicular to the screen plane, or when the base unit is also in motion along with the connecting surface on the surface (typically a horizontal plane) mounting the entire device. The recommended solution can of course be also used when the mounting console forms a single unit with the display. The subject of the specimen is a movable display mounting console, consisting of a base unit and a connecting surface, with the connecting surface including preferred fixing elements as well. The device has an engine, a microcontroller, a propulsion unit, a control interface, coating and preferably a power supply. The engine propels the machinery between the connecting surface and the base unit and/or at least one wheel. The machinery, as the case may be, has at least one limit switch. The wheel is carried by at least one rotating bearing block; when operating, the wheel touches either the surface mounting the device, or the connecting surface, or the base unit. The bearing block is fixed to the base unit or the connecting surface.

In the preferred case, the control interface also includes a receiving unit.

In another recommended version of the movable display mounting console, the microcontroller also includes a camera unit.

The movable display mounting console may also be constructed in a way that the display cables are included in the power chain running parallelly with the motion direction of the machinery between the display and the base unit.

The engine of the device ideally propels the machinery or the wheel through an intermediary torque limiting shaft coupling.

In a further preferred version of the equipment, the machinery is ideally fitted in the base unit, and consists of a horizontal threaded or ball-type spindle, a connecting nut, a carriage fixed to the nut, a guiding rail and the end bearing. The shaft of the engine or the coupling is attached to the spindle. The connecting surface is attached to the carriage by at least one intermediate item. The base unit casing is situated between the nut and the connecting surface, with at least one opening for the console with the intermediate object passing through opening. Between the guiding rail and the not, there is preferably at least one rolling or gliding carriage bearing. The preferred version of the movable display mounting console is constructed by affixing the engine and the machinery to the base unit, and the machinery consists of a vertical threaded or ball-type spindle, a connecting nut, a guiding rail, an end bearing, and a scissors-like mechanism. The engine or the coupling shaft is attached to the spindle. The fixed hinge of the scissors mechanism is connected to the end bearing or is affixed to the guiding rail or the base unit, while the movable hinge is connected to the nut. The connecting surface connects to the motor arms of the scissor mechanism by at least one hinge and a slide.

In another preferred version of the equipment, the wheel or wheels are located in the lower part of the base unit so that at least a portion of the wheels are below the lowest parts of the lateral or bottom casing of the base unit, and the connecting surface is affixed to the top of the base unit. Preferably, the lower casing of the base unit has openings for the wheels cut into it.

In another preferred version of the equipment, the wheels are located in the top part of the bass unit so that at least a portion of the wheel or wheels are higher than the topmost parts of the top casing of the base unit, and the connecting surface at least partly leans on the wheels. Preferably, the top casing of the base unit has openings for the wheels cut into it. The connecting surface has at least one. lower rail parallel with its plane. The lower rail has supporting rolls or blocks at the top. The shaft of the supporting rolls or the blocks are affixed to the base unit. The connecting surface or base unit has at least two stroke limiting units, of which at least one is affixed with a detachable joint.

In another preferred version of the equipment, the fixtures have a stalk perpendicular to the connecting surface. The fixtures around the stalk are rotating, the stalk is passing through the connecting surface or a drill hole, and the stalk has an affixed clamp unit. The specimen is further demonstrated in the following diagrams:

Diagram 1 : Spatial view of the display mounting console spindle mechanism

Diagram 2: Spatial view of internal units of the base unit in the spindle mechanism equipment

Diagram 3 : Spatial view of the quick clamp display mounting unit

Diagram 4: Spatial view of internal arrangement of the device with a fixed connecting surface

Diagram 5: Spatial view of a top-wheel device

Diagram 6: Connecting surface of a top-wheel device, spatial view

Diagram 7: Side view of a top-wheel device with partial section

Diagram 8: Spatial view of a scissor mechanism device

Diagram 9: Spatial view of a scissor mechanism device, partly without casing

Diagram 10: Combined electronics block schematic

Diagram 1 displays the equipment with a horizontal spindle mechanism in its initial state, ready for use. The demonstrated equipment consists of a 1 base unit and a 2 connecting surface performing alternating movements in relation to it. In a simple case, the 2 connecting surface is a flat sheet with mechanical properties corresponding to carrying the prospective display. In most cases, due to the slow movements, the 2 connecting surface will firmly hold the display even without a separate equipment; in other instances, however, the display may be affixed or fastened, as shown in diagram 1 , by the 3 fixtures sliding in the 20 stabilising drift, or by self-adhesive surfaces on the 2 connecting surface or on the display or self-adhesive magnetic units, or by other means known to experts s in the profession. The power supply cables and data cables may, in unfortunate cases, get tangled in nearby objects, therefore we recommend the controlled movement of the cables. This can be achieved, for example, by the 21 energy chain, well-known in the industry, through which the cables can be carried and their movement is restricted to a determined plane, avoiding their tangling. The main mechanical support for the 1 base unit is preferably the 11 casing made of steel sheets. The parts of the 1 1 casing are preferably affixed at more than one points and are equipped with vibration damping inlays or insulation for noise reduction. One of the tasks of the 1 base unit is to ensure that there is enough supporting lever and counter-torque from the weight to support the display in any position, and so this depends on the size and mass of the display. The stability of the equipment can be maintained without increasing its weight if we include a counterweight besides the units for other functions. This counterweight may be a supplement due to the favourable logistics, or with appropriate considerations, may even be a liquid-filled ballast container. The 2 connecting surface is connected to the 1 base unit machinery by 13 intermediate units pulled through the openings of the 19 console in the 12 cover sheet. The operating interface, in case of a minimalist construct, consists of one 25 switch, expandable with at least one 24 feedback LED, one 23 receiver unit, or even one 22 camera. In order to keep out foreign materials and waste from under the 12 cover sheet, it is advisable to use rows of plastic bristles touching at the sides in the 19 console openings.

Diagram 2 shows the equipment in Diagram 1 with the 2 connecting surface, the 12 cover sheet and the 1 1 casing is partly removed. The 6 engine propels the mechanism through an intermediate 16 coupling, which limits the transferable torque. This value can be adjusted with the clamp screws of the 16 coupling. In case the device gets stuck in an unexpected event (for example, foreign material on the 18 guiding rail), the 6 engine shaft keeps rotating in the 16 coupling, thereby protecting the parts from overload. The 4 spindle connects to the 16 coupling which in a more modest arrangement can be a trapezoidal threaded spindle, or in more stringent designs, a ball-type spindle. This is complemented by a standard 5 nut which, along with other structural units and the 17 carriage bearings constitutes a carriage, the top of which is affixed with the 13 upwardly faced intermediate units, fixing the 2 connecting surface through detachable joints. The purpose of the 18 guiding rail is on the one hand to provide linear guidance to the carriage, and on the other hand to mount the 9 end bearing connected to the end of the 4 spindle. The purpose of the end bearing is to guide the shaft of the 4 spindle without friction. For certain electric control systems, a 10 front limit switch and a 14 second limit switch may also become necessary, located at the end points of the movable carriage, meaning they are affixed to the 9 end bearing and the 6 engine.

Diagram 3 is an enlarged image of a 3 fixture with a 26 quick clamp. The 3 fixtures are affixed to the 2 connecting surface by 27 stalks pulled through the 20 stabilising drift. The 3 fixtures can be slid along the 20 stabilising drift in the 2 connecting surface, as well as rotated around the shaft of the 27 stalk and their height adjusted via the 26 quick clamp in order for the 3 fixtures to suit a variety of different display bases.

Diagram 4 demonstrates as design with a fixed connecting surface, making the equipment more robust and having comparatively less movable parts. The 6 engine in this case propels the 29 pulleys affixed to the shafts of the 28 wheels with two 32 belts through a double pulley. The shaft of the 28 wheels has bearings in the 30 bearing casings, the equipment preferably has four rubber-covered 28 wheels that are relatively large compared to the limits of the structure (this is advantageous in view of its resistance to uneven surfaces) and are as close as possible to the corners of the 1 base unit so that they can provide the largest possible lever arm in all directions. The equipment is placed on these wheels. The 28 wheels are purposefully inserted through the 32 wheel openings in the 11 casing covering the device at the bottom as well, and the 11 casing is only minimally removed from the surface holding the device. The device must be supported in at least three places, meaning with three wheels, balls, or low- friction legs, so that the turning of the 28 wheels will in all cases cause the movement of the 1 base unit. A portion of the 28 wheels may be freely rolling constructs. Substantial friction force is required between the pulley and the 32 bands in order for the 6 engine shaft and the 28 wheels to follow each other in a slip-resistant manner and with basically the same peripheral speed. Slip -resistant connection between the shafts can be achieved more efficiently by a gear band or gear wheel drive between the 28 wheels and the 6 engine, or by directly driving the shafts. Feedback from the actual movement may be derived from the image of the 22 camera, from which an image analysis software may determine the movement of the display mounting console relative to the unmovable objects in front of the camera, or we can use an optical sensor built into the bottom part of the 11 casing or an ultrasounds sensor on the front plate of the device. In this design, the 2 connecting surface is also the fixed top casing of the 1 base unit. Diagram 4 also displays another type of 3 fixture, which can be attached to the 20 stabilising drift of the 2 connecting surface by a manually releasable 31 threaded clamp.

The top-wheel device in Diagram 5 is similar to the previous construct regarding its driving mechanism, but here the 28 wheels extend above the top cover sheet of the 1 base unit, and the 2 connecting surface is supported at least in part by these wheels, forcing it to constantly alternating movement due to the motion of the 28 wheels. Consequently, the 28 wheel do not come into contact with other surfaces in this design, for example with the carrying surface. The end points of the 2 connecting surface are created by the 34 stroke limiting unit and the 35 detachable stroke limiting unit that may clash against the 15 supporting rolls.

Diagram 6 shows the 2 connecting surface of the top-wheel design in its upside down position. The 2 connecting surface has at least one 36 bottom rail affixed to it, parallel to its upper surface, which in turn is connected to the 15 supporting rolls affixed to the 1 base unit to lead and support the 2 connecting surface. For easier reparability, we recommend that one of the 34,35 stroke limiting unit should be a detachable construct.

The side view of Diagram 7 displays a section of the 2 connecting surface, as well as the hidden internal parts under the 1 1 casing with a dotted line. The 6 engine in this design only drives one shaft placed in the centreline, which has at least one 28 wheel, and the shaft is carried by a 30 bearing casing here as well. Diagram 7 displays the 2 connecting surface in a central position, so in this case almost the entire weight of the display is supported by the 28 wheels, easily ensuring that the display moves along as the wheels roll. The length of the 1 base unit and the number of 15 supporting rolls depends on the required movement of the display, the length of the 2 connecting surface, and the permissible load of the 15 supporting rolls. In case the 15 supporting rolls are far apart, they are burdened by a small counter-torque but the equipment itself is larger. When the 2 connecting surface moves in one of the directions from the central position, the pair of 15 supporting rolls in the given side are released from the load, but the opposite pair of 15 supporting rolls will increase by the couple of forces, created along with the wheels, with a torque equalling the torque of the unevenly burdened 2 connecting surface. The 28 wheels are reasonably placed on a single shaft so that the size of the 2 connecting surface may be utilised as best as possible, since another shaft, with its distance from the first shaft, would increase the minimum length of the 2 connecting surface. The 36 lower rails touch the 15 supporting rolls from below. Such a design may also be implemented is the 28 wheel is a cogwheel touching the gear rack affixed lengthwise to the lower part of the connecting surface.

In Diagram 8, one of the characteristics of the scissors mechanism is that the 2 connecting surface has a favourable vertical position and the 38 scissors mechanism connects horizontally to its rear part, first through the upper 39 joint, and secondly through the 40 slide moving in the 41 slotted link. The 38 scissors mechanism is made of only two arms of identical length, but by multiplying the structures, the movement of the 2 connecting surface related to the movement of the 4 spindle can be proportionally increased. In this construct it is necessary to fic the display to the 2 connecting surface through the usual detachable binding units, or for example with the 26 quick clamp (part of the 3 fixtures) as shown in the diagram. Still, even this design can be built with a horizontal 2 connecting surface. There is a 37 blanket around the 4 spindle to protect the movable parts.

Diagram 9 reveals further parts of the scissors mechanism. The drive of this design is the same as the solutions in Diagrams 1 and 2, except that here the 4 spindle is vertically placed and the 18 guiding rail runs parallelly with it. The latter contains the 9 end bearing that drives the 4 spindle and supports the 42 fixed hinge. Also, a carriage is connected to the 5 nut with at least one fixed 17 carriage bearing, touching the vertical surfaces of the 18 guiding rail. The 43 movable hinge of the 38 scissors mechanism is affixed to the carriage. This design results in a slight vertical movement at the display, which can be prevented in the easiest way if the 4 spindle is made of two parts and the top has a reversed thread relative to the bottom, and if the top hinge of the 38 scissors mechanism connects to the second, top carriage instead of the 9 end bearing. In this construct, the 6 engine has a vertical shaft and preferably has a 16 coupling to drive the 4 spindle.

For experts, it is clear that the alternating motion can be achieved through other means as well, besides the constructs introduced herein. For example, moving the scissors mechanism can be done by a linear actuator, or a work cylinder, or a gear rack moving in the vertical track, propelled by the cogwheel of the 6 engine. A handy solution is the application of a crank or a slotted link between the 1 base unit and the 2 connecting surface.

Diagram 10 shows the electronic units and their connections in the design. The control and supervision of the device requires a 7 microcontroller, which in a simple case be an easily operable and programmable, commercially available unit named Arduino Uno SM Rev3, with a built-in 44 USB socket. It contains a 16 MHz ATmega328 microcontroller with 14 digital in/out sockets (of which 6 is suitable for PWM) and 6 analogue input sockets. The 7 microcontroller is connected to a 8 drive unit (e.g., SainSmart CNC Router 1 Axis 3.5 A TB6560 Stepper Motor Driver Board. Max 3,5A). Power is supplied through the 45 power supply unit, which can either have a network connection or an USB input, for this is easily available in most computer applications. The 8 drive unit produces the gate current for the 6 engine based on the commands received from the 7 microcontroller (step impulse and the direction for the step). Preferably, the 6 engine is a stepper engine, in this case a 40 W NEMA 17 type unit. The 7 microcontroller is connected to the optional operating interface units, such as the 23 receiver or the 24 feedback LED, or the 22 camera unit. The 23 receiver unit is preferably an infrared receiver, suitable for detecting the signals from an infra remote control, but if it is a Wi-Fi or a Bluetooth unit, then the equipment can be controlled with smart devices. The 22 camera unit may serve several functions. First, through its signal, the image analysis software running in the 7 microcontroller can supervise the user's eye movements and adjust the movements of the mounting console accordingly, or it can estimate distances by the same principle, and even provide feedback of the applied display movements. Since the user may move around during operation, the display mounting console may alter the range in which it moves based on the actual distance of the user from the display. The 14 second limit switch and the 10 first limit switch are also connected to the 7 microcontroller. The 10 first limit switch is basically just a safety installation. Theoretically, the carriage will never reach this switch, but in case of an unforeseen malfunction, this switch can reverse the rotation of the engine shaft and prevent damages to the 6 engine or the 16 coupling.

The 7 microcontroller contains the software that ensures the endless looping movement of the entire mechanism. According to the program, the carriage first positions itself when the engine is moving in one direction and the carriage reaches the Γ4 second limit switch. From here, the software calculates the course the equipment will run until turned off, corresponding to the movement range of the display. This will be the initial routine every time the device is turned on. As soon as the carriage reaches the lower end switch, the software instructs the engine to send the carriage to a certain distance. This parameter is calculated from two variables: one is distance, the other is the speed of steps. Multiplying the two variables shows the time it will take the carriage to turn around in a single back-and-forth range. The Arduino Uno board provides the option to use analogue signals (variable values of resistance) when controlling the variables of distance and stepping speed.

The economically recommended distance between the eyes and the display varies depending on the size of the display. Knowing the distance between the eyes and the screen, we can determine the required depth of the work station. In case of a 15 " monitor, where a distance of 50 cm is enough, the minimum table depth needs to be 80 cm, while the recommended table depth is 90 cm. In case of a 17" monitor, the eye-screen distance is 70 cm, the minimum table depth is 90 cm, while the recommended table depth is 110 cm. For LCD monitors, the eye-screen distance is 50 cm, the minimum table depth is 70 cm, and the recommended table depth is 80 cm. The most widely accepted eye- screen distances range between 66 and 110 cm, where the distance of 66 cm has been causing more complaints, so the screen needs to be placed further away from employees. According to a study conducted in 1999, an eye-screen distance of 40 to 50 cm proved to be too little, and laboratory findings suggest that test persons preferred the distance to be 90 cm. In view of the above data, the ideal distance is not a single value, but rather the display should be placed somewhere within an optimal range. Studies show that the preferred range falls between 66 and 110 cm, with greater values being more preferred. Consequently, a display that performs movements of ±8 within this range will not have a substantially disadvantageous effect on computer workplace ergonomics. Therefore, in cases of standard computer screens, we recommend that the distance between the two extreme positions of the movable display mounting console be 16 cm, and 24 to 40 cm for larger screens, while the cycle time should be 3 to 4 minutes. The display mounting console can be moved in a slow continuous manner, or in segments consisting of short movements. Besides constant alternating motion, we can establish random motions as well as individual patterns, individual console motion programs may also be created according to various speeds of motion.

The recommended equipment shows a new approach to the treatment of Computer Vision Syndrome, since we do not use glasses or other methods or equipment that may restrict the user's activities, the varying stress on the ciliary muscle, and thereby its relaxation, is achieved unnoticed.

Reference code list

1. Base unit

2. Connecting surface

3. Fixture unit

4. Spindle

5. Nut

6. Engine

7. Microcontroller

8. Driving unit

9. End bearing

10. First limit switch

1 1. Casing

12. Covering sheet

13. Intermediate unit

14. Second limit switch

15. Supporting roll

16. Coupling

17. Carriage bearing

18. Guiding rail

19. Console opening

20. Stabilising drift

21. Energy chain

22. Camera unit

23. Receiver unit

24. Feedback LED

25. Switch

26. Quick clamp

27. Stalk 28. Wheel

29. Pulley

30. Bearing casing

31.Threaded clamp

32. Band

33. Wheel opening

34. Stroke limiting unit

35. Detachable stroke limiting unit

36. Lower rail

37. Blanket

38. Scissors mechanism

39.Hinge

40.Slide

41. Slotted link

42. Fixed hinge

43. Movable hinge

44. USB socket

45. Power supply