Adjustable television swivel arm for a seat of a rail vehicle

Abstract

This invention relates to an adjustable television swivel arm for rail vehicle seats, comprising a three-joint system with three joints that can switch between a stowed state, a raised state, a forward-tilting state, and an upward-tilting state. The first joint is rotatably mounted on the rail vehicle seat via a fixed base and includes a joint arm one. The second joint is rotatably connected to the first joint and includes a curved tube. The third joint is rotatably connected to the second joint and includes a joint arm three for mounting the television. In the stowed state, joint arm one is horizontally arranged, and joint arm three is vertically arranged, thus placing the television within the embrace of joint arm one, the curved tube, and joint arm three. In the raised state, joint arm one is raised upwards to a vertical arrangement, thereby lifting the second joint, the third joint, and the television upwards. In the forward-tilting state, the second joint flips forward at an angle relative to the first joint, thus placing the television in front of the passenger. In the upward-tilting state, the third joint flips upwards at an angle relative to the second joint, thus facing the television screen towards the passenger. This invention saves space and is easy to adjust.

Description

Technical Field

[0001] This invention relates to the field of adjustable swivel arm technology, and more particularly to an adjustable television swivel arm for rail vehicle seats. Background Technology

[0002] In existing rail vehicles, televisions (such as LCD or 3D TVs) are typically fixed or suspended at the front or rear of the carriage. However, with the advent of adjustable seats in high-speed rail business districts, the existing fixed installation method for televisions within the carriages is no longer compatible with the development of seating technology.

[0003] To improve the television viewing experience for passengers in the business district, there is an urgent need for an adjustable television arm that can be installed on the seats of rail vehicles, allowing passengers to hide it when not in use and pull it out and adjust it to a suitable position for watching television when needed. Summary of the Invention

[0004] In order to solve the above-mentioned problems of the prior art, the present invention provides an adjustable TV swivel arm for rail vehicle seats that saves storage space and is easy to adjust during use, which will be advantageous.

[0005] To achieve the above objectives, the present invention provides an adjustable television swivel arm for a rail vehicle seat, comprising a three-joint system. The three-joint system includes a first joint rotatably mounted on the rail vehicle seat via a fixed base and including a first joint arm; a second joint rotatably connected to the first joint and including a curved tube; and a third joint rotatably connected to the second joint and including a third joint arm for mounting a television. The three-joint system is configured to switch between a stowed state, a raised state, a forward-tilted state, and an upward-tilted state. In the stowed state, the television swivel arm is located on one side of the rail vehicle seat, with the first joint arm horizontally arranged and the third joint vertically arranged, thereby placing the television within the embrace formed by the first joint arm, the curved tube, and the third joint arm. In the raised state, the first joint arm is raised upward around the rail vehicle seat to a vertical arrangement, thereby lifting the second joint, the third joint, and the television upward. In the forward-tilted state, the second joint rotates clockwise forward relative to the first joint, placing the television in front of the passenger. In the upward-tilted state, the third joint rotates counterclockwise upward relative to the second joint, causing the television screen to face the passenger.

[0006] In this invention, through the above-described structure of the three-joint system, the television can change position according to the state of the three-joint system, so that when the passenger does not need to use the television, the entire television arm is in a retracted state, which not only saves space but also makes the overall appearance of the rail vehicle seats neat and simple; when the passenger needs to use the television, he can simply lift, flip forward, and flip upward to adjust the television to a suitable position in front of the passenger for viewing.

[0007] Furthermore, the second joint also includes a first adapter seat and a third adapter seat, which are respectively fixedly connected to both ends of the bend. The first adapter seat is rotatably connected to the first joint arm, and the third adapter seat is rotatably connected to the third joint arm. The second joint also includes a pull ring, which is installed on the bend.

[0008] The adapters 1 and 3 are rotatably connected to the joint arm 1 and joint arm 3 respectively, so that the second joint can rotate relative to the first and third joints to achieve forward and upward tilting movements; the pull ring makes it convenient and easy to lift the TV arm.

[0009] Furthermore, the articulated support arm has a cylinder and a mounting bracket, which is rotatably mounted on a fixed seat, and the adapter seat is rotatably connected to the cylinder. The first joint also includes a damper fixedly mounted inside the cylinder and engaged with the end of the adapter seat away from the bend, a pair of bearings fitted inside the cylinder and rotatably supporting the adapter seat, a limiting ring fixedly mounted inside the cylinder and fitted between the pair of bearings on the adapter seat, and a port fitted on the adapter seat at the end fixedly connected to the bend and threadedly connected to the cylinder.

[0010] Through the above structural design, the articulated arm can rotate relative to the fixed seat, thereby enabling the lifting action of the television arm. Through the structural design of the components within the first joint relative to the adapter seat, the second joint can rotate relative to the first joint. Furthermore, the connection between the damper and the adapter seat ensures that the second joint rotates slowly, smoothly, and without vibration. The limiting ring prevents axial displacement of the pair of bearings and also limits the circumferential rotation range of the adapter seat. The threaded connection between the port and the cylinder body fixes the axial position of the cylinder body and its internal components relative to the second joint, allowing the second joint to rotate only relative to the first joint.

[0011] Furthermore, the mounting bracket is provided with a front stop surface and a rear stop surface, and the fixed base is provided with a front stop block and a rear stop block. In the folded state, the rear stop surface abuts against the rear stop block, thereby keeping the articulated arm 1 in a horizontal position; in the lifted state, the front stop surface abuts against the front stop block, thereby keeping the articulated arm 1 in a vertical position, which forms a 100-degree angle with the horizontal position.

[0012] With the rear stop formed by the rear stop surface and the rear stop block, the three-joint system will not fall backward due to its own weight when it is in the stored state, and will tilt slightly forward when it is in the lifted state, so that the center of gravity of the TV arm is placed in front of the flat shaft. With the front stop formed by the front stop surface and the front stop block, the TV arm will not fall forward due to its own weight.

[0013] Furthermore, the end of the adapter seat that is fixedly connected to the bend is configured as a flange end, and the end that is away from the bend and snapped with the damper is configured as a free end; the port is fitted onto the adapter seat immediately adjacent to the flange end; wherein, the adapter seat has a limiting groove extending a certain distance in the circumferential direction on its outer circumferential surface, and a limiting ring is provided in the limiting ring with a limiting protrusion that cooperates with the limiting groove, thereby restricting the adapter seat from rotating relative to the limiting ring within a range of 110 degrees.

[0014] With the above structural design, when the adapter seat rotates, the limiting protrusion of the limiting ring is always located in the limiting groove of the adapter seat. Once the limiting protrusion contacts the boundary of the limiting groove, the adapter seat can no longer rotate. This limits the rotation angle range of the adapter seat relative to the limiting ring to 110 degrees, so that in the forward flip state, the second joint can be flipped forward clockwise by up to 110 degrees relative to the first joint so that the TV is located in front of the passenger.

[0015] Furthermore, the adapter has a limiting groove on its free end circumferential outer wall for installing a limiting snap ring, which abuts against one of the two bearings adjacent to it; the cylinder has an inner wall groove, and the damper and the limiting ring both have outer wall bosses that engage with the inner wall groove; the damper has an inner end boss, and the free end of the adapter has a free end notch that engages with the inner end boss.

[0016] The upper limit groove and the limit snap ring of the adapter seat can be used to limit the axial movement of the bearing. The damper and the limit ring are fixedly installed on the cylinder by the engagement of the inner wall groove and the outer wall boss. The damper is engaged with the free end notch on the free end of the adapter seat by the inner end boss, so that the adapter seat rotates smoothly by the damping of the damper during rotation.

[0017] Furthermore, the mounting base is configured as a U-shaped structure with two side walls, each of which is equipped with a pressure block for fixing the mounting base to the rail vehicle seat. A flat shaft is fixedly installed between the pressure block and the mounting base. The flat shaft has a central cylindrical portion, on which the mounting bracket is rotatably mounted. The three-joint system is installed in the armrest box of the rail vehicle seat via the pressure block on the mounting base and rotates relative to the mounting base via the flat shaft.

[0018] With the above structural design, the three-joint system can be located in the armrest box of the rail vehicle seat when in the folded state, and the first joint can pivot around the flat axis, so that it can be lifted and folded.

[0019] Furthermore, the mounting bracket is provided with a central hole, through which the central cylindrical part of the flat shaft is installed; plastic washers are installed on both sides of the mounting bracket on the flat shaft, and each plastic washer is fixed to the mounting bracket by countersunk screws; one end of the flat shaft has a limiting flange, and the other end is equipped with a nut, a spring washer and a stainless steel washer from the outside to the inside, with one plastic washer abutting against the inside of the limiting flange and the other plastic washer abutting against the inside of the stainless steel washer.

[0020] The stainless steel plate is fixed to the mounting bracket of the first joint by a plastic gasket, and the stainless steel plate is pressed against the plastic gasket by a spring washer, which provides damping for the rotation of the mounting bracket of the first joint arm and provides motion buffer for the state transition of the three-joint system.

[0021] Furthermore, the articulated arm three has a cylindrical body three and a TV mounting base; the third joint also includes a damper, a pair of bearings, a limiting ring, and a port, the damper and the limiting ring being fixedly installed inside the cylindrical body three; the adapter three has a flange end fixedly connected to the bend and a free end snapped into the damper; the port is fitted onto the adapter three adjacent to the flange end and threadedly connected to the cylindrical body three, the pair of bearings are fitted into the cylindrical body three with a transition fit and rotate therein to support the adapter three; the limiting ring is fitted onto the adapter three between the pair of bearings; wherein, the adapter three is provided with a limiting groove extending half a circumference on its outer circumferential surface, and the limiting ring is provided with a limiting protrusion that mates with the limiting groove to restrict the adapter three from rotating relative to the limiting ring within a 180-degree range.

[0022] Similar to the relationship between the articulated arm and the adapter, through the above structural arrangement, the adapter is fixed in axial position relative to the articulated arm but can rotate within a 180-degree range. The damper provides damping to achieve smooth rotation, and thus the third joint can be rotated 180 degrees counterclockwise relative to the second joint in the upturned state so that the TV screen faces the passenger.

[0023] Furthermore, the adapter seat three has a limiting groove on its circumferential outer wall at its free end for installing a limiting snap ring, which abuts against one of the two bearings adjacent to it; the cylinder three has an inner wall groove, and both the damper and the limiting ring have outer wall bosses that mesh with the inner wall groove; the damper has an inner end boss, and the free end of the adapter seat three has a free end notch that engages with the inner end boss.

[0024] The upper limit groove and limit spring of the adapter seat can be used to limit the axial movement of the bearing. The damper and the limit ring are fixedly installed on the cylinder body by the engagement of the inner wall groove and the outer wall boss. The damper is engaged with the free end notch on the free end of the adapter seat by the inner end boss and the free end notch, so that the adapter seat rotates smoothly by the damper during the rotation.

[0025] Furthermore, the adjustable TV swivel arm for rail vehicle seats of the present invention also includes an assist system, which includes a spool mounted on the bottom of a fixed base, a tension spring and a steel wire rope mounted inside the spool, and a guide wheel rotatably mounted inside the fixed base. One end of the tension spring is fixed to the spool, and the other end is connected to one end of the steel wire rope. The other end of the steel wire rope is guided by the guide wheel and fixed to the joint arm. When the three-joint system is in the retracted state, the tension spring is in the stretched state; when the three-joint system transitions from the retracted state to the lifted state, the tension spring gradually moves from the stretched state to the reset state; when the three-joint system is in the forward tilting state and the upward tilting state, the tension spring is in the reset state.

[0026] With the above structural design, when the TV arm is in the retracted state, that is, when the TV is in its original position and not pulled out, the tension spring is in the stretched state; when the TV arm changes from the retracted state to the lifted state, the tension spring will change from the stretched state to the reset state. In this process, it provides assistance in lifting the TV, making it easier for passengers to pull out the TV.

[0027] These and other aspects of the present invention will be more clearly illustrated by referring to the embodiments described below. Attached Figure Description

[0028] The structure of the invention, as well as further objects and advantages, will be better understood from the following description taken in conjunction with the accompanying drawings, wherein like reference numerals identify like elements: Figure 1 This is a three-dimensional schematic diagram of the overall structure of an adjustable television swivel arm for a rail vehicle seat according to a specific embodiment of the present invention. Figure 2 yes Figure 1 The diagram shows an exploded three-dimensional view of the adjustable TV arm for the seat of a rail vehicle. Figure 3 yes Figure 1 The diagram shows an exploded three-dimensional view of the second joint of the adjustable TV arm for the rail vehicle seat. Figure 4 yes Figure 1 The diagram shows an exploded three-dimensional view of the first joint of the adjustable TV arm for the rail vehicle seat. Figure 5 yes Figure 4 A three-dimensional structural diagram of the joint arm of the first joint from another angle. Figure 6 yes Figure 1 The diagram shows a cross-sectional view of the adjustable TV arm for a rail vehicle seat. Figure 7 yes Figure 6 A partially enlarged view of the cross-sectional structure shown; Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the structure at the limiting ring. Figure 9 yes Figure 2 A magnified view of a portion of the structure of the adjustable TV swivel arm for the rail vehicle seat shown. Figure 10 yes Figure 1 The diagram shows a perspective sectional view of the adjustable TV swivel arm for the rail vehicle seat at the fixed position. Figure 11 yes Figure 1 Another perspective sectional view of the adjustable TV swivel arm for the rail vehicle seat at the fixed seat. Figure 12 yes Figure 1 An exploded three-dimensional diagram of the third joint of the adjustable TV arm for the rail vehicle seat shown. Figure 13 It shows Figure 1 The diagram shows the force distribution of the adjustable TV swivel arm assist system for the rail vehicle seat. Figure 14 yes Figure 1 The diagram shows the seat of a rail vehicle with the adjustable TV arm mounted on it in its stowed state. Figure 15 yes Figure 14 The diagram shows the adjustable TV arm for the rail vehicle seat in the raised position. Figure 16 yes Figure 15 The diagram shown illustrates the adjustable TV arm of a rail vehicle seat in a forward-tilted position, but this view is relative. Figure 15 The viewpoint was rotated 90 degrees; Figure 17 yes Figure 16 The diagram shows the adjustable TV arm for the rail vehicle seat in an upward-tilted position. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] like Figures 1 to 13 As shown, an adjustable television swivel arm 100 for a rail vehicle seat according to a specific embodiment of the present invention includes a three-joint system and an assist system 101. The three-joint system includes a first joint 1 rotatably mounted on a rail vehicle seat (not shown) via a fixed seat 4 and including a joint arm 10; a second joint 2 rotatably connected to the first joint 1 and including a bend 20; and a third joint 3 rotatably connected to the second joint 2 and including a joint arm 30 for mounting a television 300.

[0031] Reference Figures 14 to 17As shown, in this embodiment, the three-joint system is configured to be able to be stored in a stowed state (see...). Figure 14 ), mention status (see Figure 15 ), forward roll position (see Figure 16 ) and the up-turn state (see Figure 17 The system can switch between the following states: In the stowed state, the television arm is located on one side of the rail vehicle seat, with the first joint arm 10 arranged horizontally and the third joint arm 30 arranged vertically, so that the television 300 is located within the embrace formed by the first joint arm 10, the bend 20, and the third joint arm 30; In the lifted state, the first joint arm 10 is raised upward around the rail vehicle seat (i.e., around the fixed seat 4) to a vertical position, thereby lifting the second joint 2, the third joint 3, and the television 300 upward; In the forward-flipping state, the second joint 2 flips forward clockwise relative to the first joint 1, so that the television 300 is located in front of the passenger; In the upward-flipping state, the third joint 3 flips upward counterclockwise relative to the second joint 2, so that the television screen 301 faces the passenger.

[0032] like Figure 3 As shown, in this embodiment, the second joint 2 also includes a first adapter 21 and a third adapter 23 that are fixedly connected to both ends of the bend 20, respectively. The first adapter 21 is rotatably connected to the first joint arm 10, and the third adapter 23 is rotatably connected to the third joint arm 30. The second joint 2 also includes a pull ring 22, which is installed on the bend 20.

[0033] like Figure 4 As shown, and with reference Figures 5 to 7 As shown, in this embodiment, the articulated arm 10 has a cylindrical body 11 and a mounting bracket 12. The mounting bracket 12 is rotatably mounted on the fixed base 4, and the adapter 21 is rotatably connected to the cylindrical body 11. The first joint 1 also includes a damper 13, a pair of bearings 14, a limiting ring 15, and a port 16. The damper 13 is fixedly installed inside the cylindrical body 11 and engages with the end of the adapter 21 away from the bend 20. The pair of bearings 14 are fitted inside the cylindrical body 11 with a transition fit and rotatably support the adapter 21 within it. The limiting ring 15 is fixedly installed inside the cylindrical body 11 and is fitted onto the adapter 21 between the pair of bearings 14. The port 16 is fitted onto the adapter 21 at the end of the adapter 21 that is fixedly connected to the bend 21 and is threadedly connected to the cylindrical body 11.

[0034] like Figure 3 and Figure 7 As shown, in this embodiment, the end of the adapter 21 that is fixedly connected to the bend 20 is configured as a flange end 212, and the end away from the bend 20 that is snapped into the damper 13 is configured as a free end 213; as Figure 7 As shown, port 16 is fitted onto adapter 21 immediately adjacent to flange end 212. (As...) Figure 8As shown, in this embodiment, the adapter 21 has a limiting groove 210 extending circumferentially for a distance on its outer peripheral surface, and the limiting ring 15 has a limiting protrusion 150 that cooperates with the limiting groove 210, thereby restricting the adapter 21 from rotating relative to the limiting ring 15 within a range of 110 degrees. This allows the second joint 2 to be rotated clockwise forward relative to the first joint 1 in the forward-tilting state by an angle of up to 110 degrees, so that the television 300 is located in front of the passenger.

[0035] For example Figure 3 and Figure 7 As shown, in this embodiment, the adapter 21 has a limiting groove 217 for mounting a limiting snap ring 17 on its circumferential outer wall at its free end 213. The limiting snap ring 17 abuts against one of the adjacent bearings 14 in a pair of bearings 14. For example... Figure 4 , Figure 5 and Figure 8 As shown, in this embodiment, the cylinder 11 is provided with an inner wall groove 111, the damper 13 is provided with an outer wall boss 131 that engages with the inner wall groove 111, and the limiting ring 15 is provided with an outer wall boss 151 that engages with the inner wall groove 111. For example... Figure 3 and Figure 7 As shown, in this embodiment, the damper 13 has an inner end boss 134, and the free end 213 of the adapter 21 has a free end notch 214 that engages with the inner end boss 134.

[0036] like Figure 9 and Figure 10 As shown, and with reference Figure 2 In this embodiment, the mounting base 4 is configured as a U-shaped structure and has two side walls 40. Each side wall 40 is equipped with a pressure block 41 for fixing the mounting base 4 to the rail vehicle seat. A flat shaft 42 is fixedly installed between the pressure block 41 and the mounting base 4. The flat shaft 42 has a central cylindrical portion 420, and the mounting bracket 12 is rotatably mounted on the central cylindrical portion 420. The three-joint system of the TV arm is installed in the armrest box (not shown) of the rail vehicle seat via the pressure block 41 on the mounting base 4, and rotates relative to the mounting base 4 via the flat shaft 42.

[0037] For example Figure 9 and Figure 10 As shown, and with reference Figure 2In this embodiment, the mounting bracket 12 is provided with a central hole 120, through which the central cylindrical portion 420 of the flat shaft 42 is installed. Plastic washers 43 are installed on both sides of the mounting bracket 12 on the flat shaft 42, and each plastic washer 43 is fixed to the mounting bracket 12 by a countersunk screw 44. One end of the flat shaft 42 has a limiting flange 423, and the other end is fitted with a nut 45, a spring washer 46, and a stainless steel washer 47 from the outside in. One plastic washer 43 abuts against the inner side of the limiting flange 423, and the other plastic washer 43 abuts against the inner side of the stainless steel washer 47. It should be understood that the central cylindrical portion 420 of the flat shaft 42 is installed through a bearing 48 within the central hole 120 of the mounting bracket 12.

[0038] like Figure 11 As shown, and with reference Figure 9 In this embodiment, the mounting bracket 12 is provided with a front stop surface 121 and a rear stop surface 122, and the fixing base 4 is provided with a front stop block 421 and a rear stop block 422. In the folded state, the rear stop surface 122 abuts against the rear stop block 422, thereby keeping the articulated arm 10 in a horizontal arrangement; in the lifted state, the front stop surface 121 abuts against the front stop block 421, thereby keeping the articulated arm 10 in a vertical arrangement, which forms a 100-degree angle with the horizontal arrangement. It should be noted that the front stop block 421 is a polyurethane block installed on the fixing base 4. It should also be noted that "vertical" as mentioned herein does not mean upright, but rather a near-vertical state.

[0039] like Figure 12 As shown, and with reference Figure 2 In this embodiment, the articulated arm 30 has a cylindrical body 31 and a television mounting base 32; the third joint 3 also includes a damper 33, a pair of bearings 34, a limiting ring 35, and a port 36, the damper 33 and the limiting ring 35 being fixedly installed inside the cylindrical body 31; the adapter 23 has a flange end 232 fixedly connected to the bend 20 and a free end 233 snapped into the damper 33; the port 36 is fitted onto the adapter 23 adjacent to the flange end 232 and is threadedly connected to the cylindrical body 31; the pair of bearings 34 are fitted inside the cylindrical body 31 with a transition fit. The adapter 23 rotates within it; the limiting ring 35 is fitted onto the adapter 23 between the pair of bearings 34; wherein, the adapter 23 has a limiting groove 230 extending half a circumference in the circumferential direction on its outer circumferential surface, and the limiting ring 35 has a limiting protrusion 350 that cooperates with the limiting groove 230, thereby restricting the adapter 23 from rotating within a 180-degree range relative to the limiting ring 35, and thus enabling the third joint 3 to rotate 180 degrees counterclockwise relative to the second joint 2 in the flipped-up state, so that the television screen 301 faces the passenger.

[0040] like Figure 3 and Figure 12 As shown, and with reference Figure 6 As shown, in this embodiment, the adapter 23 has a limiting groove 237 for installing a limiting snap ring 37 on its circumferential outer wall at its free end 233. The limiting snap ring 37 abuts against one of the pair of bearings 34 adjacent to it. The cylinder 31 has an inner wall groove 311. The damper 33 has an outer wall boss 331 that engages with the inner wall groove 311. The limiting ring 35 has an outer wall boss 351 that engages with the inner wall groove 311. The damper 33 has an inner end boss 334. The free end 233 of the adapter 23 has a free end notch 234 that engages with the inner end boss 334.

[0041] like Figure 1 , Figure 2 and Figure 13 As shown, in this embodiment, the assist system 101 includes a spool 5 mounted on the bottom of the fixed base 4, a tension spring 6 and a steel wire rope 7 mounted inside the spool 5, and a guide wheel 8 rotatably mounted inside the fixed base 4. One end of the tension spring 6 is fixed to the spool 5 by means of a spring hanger 9, and the other end is connected to one end of the steel wire rope 7. The other end of the steel wire rope 7 is guided by the guide wheel 8 and then fixed to the articulated support arm 10. When the three-joint system is in the retracted state (see...),... Figure 14 ), the tension spring 6 is in the tensioned state; when the three-joint system moves from the stored state to the lifted state (see Figure 15 During the transition, tension spring 6 gradually moves from the stretched state to the reset state; when the three-joint system is in the forward tilting state (see...), Figure 16 ) and the up-turn state (see Figure 17 When the tension spring 6 is in the reset state, the tension spring 6 is in the reset state.

[0042] like Figure 13 As shown, when the TV arm is in the retracted state, i.e., when the TV 300 is in its returned position and not pulled out, the tension spring 6 is in the stretched state. At this time, the force value is F1=kx, the lever arm is L1, and the weight of the TV 300 is G, the resistance arm is L2. Based on the calculation that F1×L1<G×L2, the TV 300 will not rise actively at this time. However, since the tension spring 6 has a tendency to return to its original position, it provides a assisting effect. Therefore, when the operator, such as a passenger, applies force F3, the TV 300 can be pulled up more easily. When the passenger pulls up the TV arm using the pull ring 22, the joint arm 10 rotates around the flat shaft 42, and the rebound force of the tension spring 6 provides an assisting effect, making it easier for the passenger to pull out the TV 300. It should be understood that when the weight of the TV 300 is changed, the magnitude of the assisting force can be adjusted by changing the K coefficient of the tension spring 6.

[0043] The technical content and features of this invention have been disclosed above. However, it is understood that, under the inventive concept of this invention, those skilled in the art can make various changes and improvements to the above structure, including combinations of the technical features disclosed or claimed herein, as well as other combinations that explicitly include these features. These modifications and / or combinations all fall within the technical field of this invention and are within the scope of protection of the claims of this invention.

Claims

1. An adjustable television swivel arm for a rail vehicle seat, characterized in that... The system includes a three-joint system comprising a first joint rotatably mounted on a rail vehicle seat via a fixed base and including a first joint arm, a second joint rotatably connected to the first joint and including a curved tube, and a third joint rotatably connected to the second joint and including a third joint arm for mounting a television. The three-joint system is configured to switch between a stowed state, a raised state, a forward-tilted state, and an upward-tilted state. In the stowed state, the television arm is located on one side of the rail vehicle seat, the first joint arm is horizontally arranged, and the third joint arm is vertically arranged, so that the television is located within the embrace formed by the first joint arm, the curved tube, and the third joint arm. In the raised state, the first joint arm is raised upward around the rail vehicle seat to a vertical arrangement, thereby lifting the second joint, the third joint, and the television upward. In the forward-tilted state, the second joint rotates clockwise forward relative to the first joint, so that the television is positioned in front of the passenger. In the upward-tilted state, the third joint rotates counterclockwise upward relative to the second joint, so that the television screen faces the passenger.

2. The adjustable TV arm for rail vehicle seats as described in claim 1, characterized in that, The second joint also includes a first adapter seat and a third adapter seat, which are respectively fixedly connected to both ends of the bend. The first adapter seat is rotatably connected to the first joint arm, and the third adapter seat is rotatably connected to the third joint arm. The second joint also includes a pull ring, which is installed on the bend.

3. The adjustable TV swivel arm for rail vehicle seats as described in claim 2, characterized in that, The articulated support arm has a cylindrical body and a mounting bracket, the mounting bracket being rotatably mounted on the fixed seat, and the adapter seat being rotatably connected to the cylindrical body. The first joint also includes a damper fixedly mounted inside the cylindrical body and engaging with the end of the adapter seat away from the bend, a pair of bearings fitted with the cylindrical body and rotatably supporting the adapter seat therein, a limiting ring fixedly mounted inside the cylindrical body and fitted onto the adapter seat between the pair of bearings, and a fixed connection to the bend. One end of the connector is fitted onto the adapter and threadedly connected to the cylinder. The mounting bracket is provided with a front stop and a rear stop, and the fixed base is provided with a front stop block and a rear stop block. In the retracted state, the rear stop abuts against the rear stop block to keep the articulated arm in the horizontal position. In the lifted state, the front stop abuts against the front stop block to keep the articulated arm in the vertical position, which forms a 100-degree angle with the horizontal position.

4. The adjustable TV arm for rail vehicle seats as described in claim 3, characterized in that, The end of the adapter seat one that is fixedly connected to the bend is configured as a flange end, and the end away from the bend that is engaged with the damper is configured as a free end; the port is fitted onto the adapter seat one adjacent to the flange end; wherein, the adapter seat one is provided with a limiting groove extending a certain distance in the circumferential direction on its outer circumferential surface, and the limiting ring is provided with a limiting protrusion that cooperates with the limiting groove in its interior, thereby restricting the adapter seat one from rotating relative to the limiting ring within a range of 110 degrees.

5. The adjustable TV arm for rail vehicle seats as described in claim 4, characterized in that, The adapter seat 1 has a limiting groove on its circumferential outer wall at its free end for installing a limiting snap ring, which abuts against one of the pair of bearings adjacent to it; the cylinder 1 has an inner wall groove, and both the damper and the limiting ring have outer wall bosses that engage with the inner wall groove; the damper has an inner end boss, and the free end of the adapter seat 1 has a free end notch that engages with the inner end boss.

6. The adjustable TV arm for rail vehicle seats as described in claim 3, characterized in that, The mounting base is configured as a U-shaped structure with two side walls. Each side wall is equipped with a pressure block for fixing the mounting base to the rail vehicle seat. A flat shaft is fixedly installed between the pressure block and the mounting base. The flat shaft has a central cylindrical portion, and the mounting bracket is rotatably mounted on the central cylindrical portion. The three-joint system is installed in the armrest box of the rail vehicle seat via the pressure block on the mounting base and rotates relative to the mounting base via the flat shaft.

7. The adjustable TV arm for rail vehicle seats as described in claim 6, characterized in that, The mounting bracket has a central hole through which the central cylindrical portion of the flat shaft is installed. Plastic gaskets are installed on both sides of the mounting bracket on the flat shaft, and each plastic gasket is fixed to the mounting bracket by a countersunk screw. One end of the flat shaft has a limiting flange, and the other end is fitted with a nut, a spring washer, and a stainless steel gasket from the outside in. One plastic gasket abuts against the inner side of the limiting flange, and the other plastic gasket abuts against the inner side of the stainless steel gasket.

8. The adjustable TV arm for rail vehicle seats as described in claim 2, characterized in that, The articulated support arm has a cylindrical body and a TV mounting base; the third joint also includes a damper, a pair of bearings, a limiting ring, and a port, the damper and the limiting ring being fixedly installed inside the cylindrical body; the adapter seat has a flange end fixedly connected to the bend and a free end snapped into the damper; the port is fitted onto the adapter seat adjacent to the flange end and threadedly connected to the cylindrical body; the pair of bearings are fitted into the cylindrical body with a transition fit and rotate therein to support the adapter seat; the limiting ring is fitted onto the adapter seat between the pair of bearings; wherein, the adapter seat has a limiting groove extending half a circumference on its outer circumferential surface, and the limiting ring has a limiting protrusion that mates with the limiting groove to restrict the adapter seat from rotating relative to the limiting ring within a 180-degree range.

9. The adjustable television arm for a rail vehicle seat as described in claim 8, characterized in that, The adapter seat three has a limiting groove on its circumferential outer wall at its free end for installing a limiting snap ring, which abuts against one of the pair of bearings adjacent to it; the cylinder three has an inner wall groove, and both the damper and the limiting ring have outer wall bosses that engage with the inner wall groove; the damper has an inner end boss, and the free end of the adapter seat three has a free end notch that engages with the inner end boss.

10. The adjustable television swivel arm for a rail vehicle seat as described in any one of claims 1 to 9, characterized in that, It also includes a power assist system, which comprises a spool mounted on the bottom of the fixed base, a tension spring and a steel wire rope installed inside the spool, and a guide wheel rotatably mounted inside the fixed base. One end of the tension spring is fixed to the spool, and the other end is connected to one end of the steel wire rope. The other end of the steel wire rope is guided by the guide wheel and fixed to the joint arm. When the three-joint system is in the retracted state, the tension spring is in the stretched state; when the three-joint system transitions from the retracted state to the lifted state, the tension spring gradually moves from the stretched state to the reset state; when the three-joint system is in the forward tilting state and the upward tilting state, the tension spring is in the reset state.

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