Armrest structure

Abstract

The utility model relates to a handrail structure which comprises a framework. The cover plate is overturned between a closing position and a maximum position relative to the framework through a rotating shaft and passes through a first position and a second position during the period; the armrest structure further comprises a torsional spring set connected between the cover plate and the framework. The torsional spring set comprises at least one forward torsional spring and at least one reverse torsional spring which are arranged on the rotating shaft in a sleeving mode. The torsional spring set is arranged to provide reverse torque resisting the gravity torque of the cover plate for the cover plate, so that after the cover plate is unlocked, the cover plate can be automatically opened from the closed position to the first position. And hovering at any position between the first position and the second position; and slowly opening from the second position to the maximum position. At least one forward torsion spring and at least one reverse torsion spring are arranged between the cover plate and the framework, forward torque and reverse torque are applied to the cover plate at the same time, the functions of assisting, hovering and buffering in the opening process of the cover plate can be achieved, and compared with a traditional handrail structure, the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to an armrest structure. Background Art

[0002] Traditional armrest covers are usually opened automatically by transmission motors or torsion springs. For transmission motors, they have disadvantages such as high cost, large space occupation, and noise; for torsion springs, although they can be opened automatically, they cannot be hovered, and there is a problem that the cover opens to the bottom and hits the rear parts violently.

[0003] The patent disclosed below enables automatic opening and hovering functions:

[0004] Patent 1, CN113264278B discloses a flip mechanism, which provides cover opening force by driving a torsion spring, and cooperates with the friction between the friction plate and the support plate as resistance to cover opening, thereby realizing a hovering function when the cover is opened to a specific angle, and through resistance constraint, avoiding the problem of the cover opening to the end and violently hitting the rear parts. However, this scheme has high tolerance requirements for the friction plate and the support plate. Although the friction plate and the support plate themselves are not expensive, the production process is complicated, so the production cost is high.

[0005] Patent 2, CN210760500U discloses a connection structure, which provides a cover opening force by driving a torsion spring, and cooperates with the friction force generated by the extrusion of the first and second suspension springs as the resistance to the cover opening, thereby realizing the suspension function when the cover is opened to a specific angle, and through the resistance constraint, avoiding the problem of the cover opening to the end and violently hitting the rear parts. This scheme is similar to Patent 1, and it has high tolerance requirements for the first and second suspension springs. Although the first and second suspension springs themselves are not expensive, the production process is complicated, so the production cost is high.

[0006] Patent 3, CN207017043U, discloses a torsion spring damping device for a washing machine cover, which provides a cover opening force by driving a torsion spring, and cooperates with the reverse torque provided by the damping to reduce the resistance of the cover opening, thereby realizing a hovering function when the cover is opened to a specific angle, and through resistance constraint, avoiding the problem of the cover opening to the end and violently hitting the rear parts. However, the cost of the damping parts themselves is relatively high.

[0007] In summary, although the existing technology can act on the opening process of the cover through some auxiliary structures, and then divide the opening process of the cover into an assisted opening section, a hovering section and a buffer section to achieve multiple functions of assisted opening, hovering and buffering, these auxiliary structures either have high cost of parts themselves or complex production processes resulting in high production costs, neither of which is the best solution. Utility Model Content

[0008] In order to solve the above problems, the utility model provides an armrest structure, which can realize the assisting, hovering and buffering functions of the cover opening process by arranging at least one positive torsion spring and at least one reverse torsion spring between the cover plate and the frame and applying positive and reverse torque to the cover plate at the same time, and has a simple structure and low cost.

[0009] The utility model is realized by the following scheme: a handrail structure,

[0010] Skeleton; a cover that flips between a closed position and a maximum position relative to the skeleton by a rotating shaft, during which a first position and a second position are passed; characterized in that:

[0011] The armrest structure further comprises a torsion spring group connected between the cover plate and the frame, wherein the torsion spring group comprises at least one positive torsion spring and at least one negative torsion spring sleeved on the rotating shaft;

[0012] The torsion spring group is configured to provide a counter torque to the cover plate to resist the gravity torque of the cover plate.

[0013] A further improvement of the armrest structure of the utility model is that a first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all reverse torsion springs gradually decrease and increase respectively as the cover plate is opened, and during the process of the cover plate rotating from the closed position to the first position, the sum of the first total torque and the second total torque is greater than the gravity torque of the cover plate.

[0014] A further improvement of the armrest structure of the utility model is that a first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all reverse torsion springs gradually decrease and increase respectively as the cover plate is opened, and during the process of the cover plate rotating from the first position to the second position, the sum of the first total torque and the second total torque is equal to the gravity torque of the cover plate.

[0015] A further improvement of the armrest structure of the utility model is that a first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all reverse torsion springs gradually decrease and gradually increase as the cover plate is opened, and during the process of the cover plate rotating from the second position to the vertical position, the sum of the first total torque and the second total torque is greater than the gravity torque of the cover plate, and during the process of the cover plate rotating from the vertical position to the maximum position, the sum of the first total torque and the second total torque is less than the gravity torque of the cover plate.

[0016] A further improvement of the armrest structure of the utility model is that the torsion spring group includes at least one torsion spring pair, and the torsion spring pair is formed by connecting one of the forward torsion springs and one of the reverse torsion springs.

[0017] A further improvement of the armrest structure of the utility model is that a cantilever of the forward torsion spring and a cantilever of the reverse torsion spring of the torsion spring pair are connected to form a hanging part, and the hanging part is connected to the cover plate.

[0018] A further improvement of the armrest structure of the utility model lies in that the skeleton is provided with a socket connected to one of the other cantilever of the forward torsion spring of the torsion spring pair and the other cantilever of the reverse torsion spring, and an introduction groove connected to the other cantilever of the forward torsion spring of the torsion spring pair and the other cantilever of the reverse torsion spring.

[0019] A further improvement of the handrail structure of the utility model is that one end of the introduction groove extends to the edge of the frame to form an opening.

[0020] A further improvement of the armrest structure of the utility model is that a limit pin is provided on the cover plate, and a limit groove is provided on the frame. When the cover plate is opened, the limit pin extends into the limit groove and is blocked by the limit groove to limit the maximum opening position of the cover plate.

[0021] A further improvement of the armrest structure of the utility model is that at least one pair of mounting ears is provided on one of the cover plate and the frame, and a mounting groove for each pair of the mounting ears to be inserted is provided on the other of the cover plate and the frame, and an axial hole for the rotating shaft to pass through is opened on each pair of the mounting ears and the mounting groove, so that the cover plate can be flipped relative to the frame through the rotating shaft.

[0022] The utility model can realize the functions of assisting, suspending and buffering the opening process of the cover plate by setting at least one positive torsion spring and at least one reverse torsion spring between the cover plate and the frame, and applying positive and reverse torques to the cover plate at the same time, and has a simple structure and low cost. At least one positive torsion spring and at least one reverse torsion spring can be combined into a variety of schemes, and the structure is more flexible and can be adapted to various different cover plate structures. In addition, through the coordinated setting of the limit pin and the limit groove, the maximum opening position of the cover plate can be constrained to prevent the cover plate from opening too much and colliding with other external components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the cover opening process is shown.

[0024] Figure 2 The figure shows a rear view of the first embodiment of the utility model in an assembled state with a cover plate and a frame.

[0025] Figure 3The figure shows a three-dimensional view of the first embodiment of the utility model, the cover plate and the frame in an exploded state.

[0026] Figure 4 The perspective view of the assembly state of the first embodiment of the utility model, the cover plate and the frame is shown.

[0027] Figure 5 The figure shows a rear view of the second embodiment of the utility model in an assembled state with a cover plate and a frame.

[0028] Figure 6 Shows Figure 5 AA section view.

[0029] Figure 7 Shows Figure 5 BB cross-sectional view.

[0030] Figure 8 The third embodiment of the utility model is shown in a perspective view of the exploded state of the cover plate and the frame.

[0031] Fig. 9 A perspective view of the assembly state of the second embodiment of the utility model, the cover plate and the frame is shown.

[0032] Fig.10 A schematic diagram comparing the cantilever positions of the torsion spring pair in the first embodiment or the second embodiment of the utility model in a free state and in a pre-tightened state when the cover plate is in a closed state is shown.

[0033] Fig.11 An enlarged schematic diagram of a mounting slot on the frame is shown.

[0034] Fig.12 An enlarged schematic diagram of a pair of mounting ears on the cover plate is shown.

[0035] Fig.13 An enlarged schematic diagram of another mounting slot on the frame is shown.

[0036] Fig.14 An enlarged schematic diagram of another pair of mounting ears on the cover is shown.

[0037] Fig.15 The figure shows the matching state of the limit pin and the limit groove when the cover is fully opened.

[0038] Fig.16 A perspective view of the assembly state of the third embodiment of the utility model, the cover plate and the frame is shown.

[0039] Fig.17 A schematic diagram showing the cantilever positions of the forward torsion spring and the reverse torsion spring in the third embodiment of the utility model when the cover is in the closed state.

[0040] Fig.18A cross-sectional view is shown when the cover is locked in the closed position by the catch.

[0041] Fig.19 Shows Fig.18 Enlarged view of part C.

[0042] Fig. 20 A cross-sectional view is shown when the cover is manually unlocked.

[0043] Fig.21 Shows Fig. 20 Enlarged view of part D.

[0044] Fig. 22 The figure shows a side view of the torsion spring pair in the first embodiment or the second embodiment of the utility model when the cover is in a closed state, a suspended state and a fully opened state.

[0045] In the figure: 1. skeleton; 11. mounting groove; 112. jack; 113. introduction groove; 114. limiting groove; 12. storage compartment; 2. cover plate; 21a. first mounting ear; 21b. second mounting ear; 21c. accommodating space; 22. retaining wall; 221. limiting hook; 222. cantilever groove; 24. reinforcing plate; 25. limiting pin; 3. rotating shaft; 31. shaft hole; 4. torsion spring assembly; 41. forward torsion spring; 41a. first cantilever; 41b. second cantilever; 42. reverse torsion spring; 42a. third cantilever; 42b. fourth cantilever; 43. hanging part; 5. locking member; 51. buckle; 511. hook part; 512. buckle part; 52. buckle; 521. slot. DETAILED DESCRIPTION

[0046] The utility model provides an armrest structure, which can realize the functions of assisting, hovering and buffering the opening process of the cover plate by arranging at least one positive torsion spring and at least one negative torsion spring between the cover plate and the frame, and applying positive and negative torques to the cover plate at the same time, and has lower cost than the traditional armrest structure. The armrest structure is further described below with specific embodiments and drawings.

[0047] See also Figures 1 to 9As shown, an armrest structure comprises: a frame 1; a cover plate 2 that flips between a closed position S0 and a maximum position S3 relative to the frame 1 through a rotating shaft 3, during which it passes through a first position S1 and a second position S2; the armrest structure also comprises a torsion spring group 4 connected between the cover plate 2 and the frame 1, the torsion spring group 4 comprises at least one positive torsion spring 41 and at least one negative torsion spring 42 sleeved on the rotating shaft 3, and the two cantilevers of the positive torsion spring 41 and the two cantilevers of the negative torsion spring 42 are respectively connected to the cover plate 2 and the frame 1. Here, the direction of opening the cover plate is defined as the positive direction, and the direction of closing the cover plate is defined as the negative direction. The positive torsion spring 41 provides a positive torque to drive the cover plate 2 to open, and the negative torsion spring 42 provides a negative torque to prevent the cover plate 2 from opening. The torsion spring group 4 is configured to provide a reaction torque to the cover plate 2 to counteract the gravity torque of the cover plate 2, so that after the cover plate 2 is unlocked, it can automatically open from the closed position S0 to the first position S1; and hover at any position between the first position S1 and the second position S2; and slowly open from the second position S2 to the maximum position S3 (i.e., the fully open position). In which, the sum of the torques of all the positive torsion springs 41 on the rotating shaft 3 is assumed to be the first total torque F1, and the sum of the torques of all the reverse torsion springs 42 is assumed to be the second total torque F2. During the opening process of the cover plate 2, due to the change in the angle of the cover plate 2 relative to the frame 1, the magnitudes of the first total torque F1, the second total torque F2, and the gravity torque G of the cover plate 2 change with the opening process of the cover plate 2.

[0048] The utility model aims to counteract the gravity torque G of the cover plate itself by the sum of the first total torque F1 and the second total torque F2, and divide the opening process of the cover plate 2 into the power-assisted opening section I, the hovering section II and the buffer section III. Specifically, Figure 1 As shown:

[0049] (1) The process of the cover plate 2 moving from the closed position S0 to the first position S1 is the assisted opening section I. In this section, as the angle of the cover plate 2 relative to the frame 1 increases, F1 gradually decreases, F2 gradually increases, and G gradually decreases, but always maintains |F1+F2|>|G|. Therefore, after the cover plate 2 is unlocked, the sum of the first total torque F1 and the second total torque F2 can drive the cover plate 2 to open automatically.

[0050] (2) The process of the cover plate 2 moving from the first position S1 to the second position S2 is the hovering section II. In this section, as the angle of the cover plate 2 relative to the frame 1 continues to increase, F1 gradually decreases, F2 gradually increases, and G gradually decreases, but always maintains |F1+F2|=|G|, that is, the sum of the first total torque F1 and the second total torque F2 offsets the gravity torque G. Therefore, the cover plate 2 will not continue to open automatically, but needs to be manually applied external force to continue to open. When the external force is removed, the cover plate 2 can hover at any position in this section.

[0051] (3) The process from the second position S2 to the maximum position S3 of the cover plate 2 is the buffer zone III. In this zone, as the angle of the cover plate 2 relative to the frame 1 increases, F1 gradually decreases and F2 gradually increases. The change of G can be divided into two cases. When the angle of the cover plate 2 relative to the frame 1 does not exceed 90 degrees, that is, when the cover plate 2 rotates from the second position to the vertical position, G gradually decreases, but maintains |F1+F2|>|G|. Therefore, the sum of the first total torque F1 and the second total torque F2 can drive the cover plate 2 to continue to open; When the angle of the cover plate 2 relative to the frame 1 exceeds 90, that is, when the cover plate 2 rotates from the vertical position to the maximum position, G changes direction and gradually increases, but always maintains |F1+F2|<|G|. Therefore, the gravity torque G is partially offset by the sum of the first total torque F1 and the second total torque F2. The remaining gravity torque G can drive the cover plate 2 to slowly open, and then the cover plate 2 opens more slowly when it is closer to the maximum position S3, thereby achieving the purpose of buffering and preventing the cover plate 2 from colliding with other external parts when it is opened to the bottom.

[0052] It should be noted that the magnitude and variation range of the first total torque F1 and the second total torque F2 can be limited by the number of the forward torsion springs and the reverse torsion springs and the number of coils and the wire diameter of the torsion springs. The forward torsion springs and the reverse torsion springs can be separately arranged or connected and arranged as a whole.

[0053] There can be multiple combinations of the forward torsion springs and the reverse torsion springs in the torsion spring group 4, as long as the above requirements are met. The distribution and installation of the torsion spring group 4 are specifically described below through several embodiments:

[0054] First embodiment: See Figures 2 to 4 and Fig.10 As shown, the torsion spring group 4 includes a torsion spring pair formed by connecting a forward torsion spring 41 and a reverse torsion spring 42. Here, the two cantilevers of the forward torsion spring 41 in the torsion spring pair are respectively the first cantilever 41a and the second cantilever 41b, and the two cantilevers of the reverse torsion spring 42 are respectively the third cantilever 42a and the fourth cantilever 42b. In the torsion spring pair, the second cantilever 41b of the forward torsion spring 41 and the fourth cantilever 42b of the reverse torsion spring 42 are connected together to form a hanging portion 43. The design torsion force of the forward torsion spring 41 is greater than the design torsion force of the reverse torsion spring 42. The forward torsion spring 41 and the reverse torsion spring 42 are both sleeved on the rotating shaft 3, and the hanging portion 43 is connected to the cover plate 2. The first cantilever 41a of the forward torsion spring 41 and the third cantilever 42a of the reverse torsion spring 42 are both connected to the frame 1. The free state of the torsion spring pair before installation and the closed state after installation when the cover plate 2 is in the closed position are compared as shown in the figure. Fig.10As shown, the angle between the two cantilevers (i.e., 41a and 41b) of the positive torsion spring 41 is an acute angle when in the free state, and an obtuse angle when in the closed state, so as to accumulate the maximum positive torque, so that during the opening process of the cover 2, although the angle between the two cantilevers (i.e., 41a and 41b) gradually decreases and the torque gradually decreases, the positive torque is always provided.

[0055] Regarding the installation of the torsion spring pair in this embodiment: Figure 11 to Figure 14As shown, a pair of mounting ears are fixed on the cover plate 2, and the mounting ears include a first mounting ear 21a and a second mounting ear 21b which are arranged opposite to each other on the left and right sides, and an accommodation space 21c for accommodating the torsion spring pair is formed between the first mounting ear 21a and the second mounting ear 21b. A mounting groove 11 for the mounting ears to be embedded is formed on the frame 1, and shaft holes 31 for the rotating shaft 3 to pass through are provided on both side walls of the mounting groove 11 and the first mounting ear 21a and the second mounting ear 21b. The bottom of the mounting groove 11 is provided with an introduction groove 113 for the first cantilever 41a of the forward torsion spring 41 to be clamped and a socket 112 for the third cantilever 42a of the reverse torsion spring 42 to be inserted. Of course, in some embodiments, the third cantilever 42a of the reverse torsion spring 42 can also be clamped in the introduction groove 113, and the first cantilever 41a of the forward torsion spring 41 can be inserted in the socket 112. The lower cover of the cover plate 2 is formed with a retaining wall 22 for clamping the torsion spring pair. Preferably, the edge of the retaining wall 22 is provided with a cantilever groove 222 for clamping the second cantilever 41b of the forward torsion spring 41 and the fourth cantilever 42b of the reverse torsion spring 42. When the upper cover of the cover plate 2 is pressed on the cantilever groove 222, the longitudinal movement of the hanging part 43 of the torsion spring pair is limited. The lower cover of the cover plate 2 is also formed with a limit hook 221 that cooperates with the hanging part 43 of the torsion spring group 4 to limit the backward movement of the hanging part 43. In order to facilitate the installation of the torsion spring pair, one end of the introduction groove 113 extends to the edge of the frame 1 to form an opening. During installation, the cover plate 2 is first set on the frame 1 and is in a closed state, and then the torsion spring pair is placed in the accommodating space 21c, and the third cantilever 42a of the reverse torsion spring 42 is first inserted into the insertion hole 112, and the hanging part 43 is hung on the limit hook 221, and then the shaft 3 passes through all the shaft holes 31 and the torsion spring pair to achieve the connection between the cover plate 2 and the frame 1 and the preliminary connection of the torsion spring pair. After that, the cover plate 2 is opened, and the first cantilever 41a of the positive torsion spring 41 in the torsion spring pair will swing downward. When it swings to the opening of the introduction slot 113, it is pushed along the introduction slot 113 to the end of the introduction slot 113. The introduction slot 113 can be designed to be U-shaped or L-shaped, so the first cantilever 41a of the positive torsion spring 41 will not easily fall out after being pushed to the end of the introduction slot 113. When the cover plate 2 is in the closed state, the third cantilever 42a of the reverse torsion spring 42 is subjected to the least force, and it is convenient to observe the position of the cantilever and the jack, which is convenient for installation. When the cover plate 2 is in the open state, the first cantilever 41a of the forward torsion spring 41 is subjected to the least force, and installation can be achieved by simply pushing the cantilever along the guide groove with a simple tool. Therefore, the present embodiment adopts the above structure and installation method, which makes installation convenient and labor-saving. Furthermore, a reinforcing plate 24 is provided in the accommodating space 21c, and an axial hole 31 for the rotating shaft 3 to pass through is opened on the reinforcing plate 24. The forward torsion spring 41 and the reverse torsion spring 42 in the torsion spring group 4 are respectively located on opposite sides of the reinforcing plate 24. By setting the reinforcing plate 24, the contact area with the rotating shaft 3 is increased, and the installation strength of the rotating shaft 3 is improved.The above-mentioned mounting ears and mounting groove structures can also be reversed, that is, the mounting ears are arranged on the frame 1, and the mounting grooves are arranged on the cover plate 2. Preferably, as. Figure 3 As shown, a storage compartment 12 is also provided on the frame 1 for storing objects (such as mobile phones, water cups, etc.). When the cover plate 2 is in the closed position S0, the storage compartment 12 is covered.

[0056] Second embodiment: See Figures 5 to 14 As shown, the structure of this embodiment is similar to that of the first embodiment, except that the torsion spring group 4 of this embodiment includes two torsion spring pairs, two pairs of mounting ears are provided on the cover plate 2 at intervals, and correspondingly, two mounting grooves 11 are provided on the frame 1 at intervals, and the two torsion spring pairs are respectively arranged at the accommodation spaces 21c of the two pairs of mounting ears and sleeved on the rotating shaft 3, and the two pairs of mounting ears are connected in the two mounting grooves 11 in a one-to-one correspondence through the two rotating shafts 3. The first total torque F1 is the sum of the torques of the two positive torsion springs 41, and the second total torque F2 is the sum of the torques of the two reverse torsion springs 42.

[0057] Third embodiment: See Fig.16 and Fig.17 As shown, the torsion spring group 4 includes an independent forward torsion spring 41 and an independent reverse torsion spring 42. The structure of the frame 1 and the cover plate 2 of this embodiment is the same as that of the second embodiment, and two pairs of mounting ears and two mounting slots 11 are also provided. The forward torsion spring 41 and the reverse torsion spring 42 in the torsion spring group 4 are respectively arranged at the accommodation space 21c of the two pairs of mounting ears and sleeved on the rotating shaft 3. The first cantilever 41a of the forward torsion spring 41 is connected to the introduction slot 113 of one of the mounting slots 11, the second cantilever 41b of the forward torsion spring 41 is connected to the cover plate 2, the third cantilever 42a of the reverse torsion spring 42 is connected to the jack 112 of another mounting slot 11, and the fourth cantilever 42b of the reverse torsion spring 42 is connected to the cover plate 2. The first total torque F1 is the torque of the forward torsion spring 41, and the second total torque F2 is the torque of the reverse torsion spring 42.

[0058] See also Figure 1 , Figure 18 to Figure 21 As shown, in order to prevent the cover plate 2 from shaking due to external vibration or bump when in the closed position and to maintain it in a stable closed state, a locking member 5 for locking the cover plate 2 in the closed position S0 is provided between the cover plate 2 and the frame 1. Specifically, the locking member 5 includes a buckle 51 installed on the side of the cover plate 2 relatively far from the rotating shaft 3, and a buckle 52 formed on the frame 1 at a position corresponding to the buckle 51. The middle part of the buckle 51 is hinged to the cover plate 2, one end of the buckle 51 extends outward from the cover plate 2 and forms a hand buckle 512 for hand operation, and the other end of the buckle 51 extends downward from the cover plate 2 and forms a hook 511. The buckle 52 is provided with a slot 521 for the hook 511 to be hung. When the cover plate 2 is in the closed position S0, the hook 511 is hung on the slot 521, as shown in FIG. Fig.16 and Fig.17 As shown, at this time, the cover plate 2 is locked in the closed position S0. When the hand buckle portion 512 is pressed manually, the hook portion 511 will be disengaged from the card slot 521, so that the cover plate 2 is unlocked. Fig.18 and Fig.19 When the cover plate 2 is unlocked, under the action of the torsion spring group 4, the cover plate 2 will enter the power-assisted opening section I, the hovering section II and the buffer section III in sequence.

[0059] See also Figure 11 to Figure 15 As shown, the cover plate 2 is provided with a limit pin 25, and the frame 1 is provided with a limit groove 114. When the cover plate 2 is fully opened, the limit pin 25 extends into the limit groove 114 and is blocked by the limit groove 114. For the first to third embodiments, the limit pin 25 is fixed to the side of a pair of mounting ears, and the limit groove 114 is opened on the side of the corresponding mounting groove 11. The limit pin 25 is inserted into the limit groove 114 and slides along the limit groove 114 as the cover plate 2 is opened. When the cover plate 2 is fully opened, the limit pin 25 is just blocked and limited at the end of the limit groove 114. Through the coordinated arrangement of the limit pin 25 and the limit groove 114, the maximum opening position of the cover plate 2 can be constrained to prevent the cover plate 2 from opening too much and colliding with other external parts.

[0060] The following takes the first embodiment as an example to illustrate the working principle of the armrest structure in combination with the change of the torsion spring as the cover plate is opened:

[0061] See also Figure 1 and Fig. 22 As shown, when the cover plate 2 is locked in the closed position S0 by the buckle 51 (as shown in FIG. Figure 1 As shown), the torsion spring is in Fig. 22 In the closed state of the middle left figure, at this time, the positive torsion spring 41 in the torsion spring pair is compressed to the maximum angle, and the stored positive torque is the largest, while the negative torsion spring 42 is compressed to the minimum angle, and the stored negative torque is the smallest. The sum of the positive torque and the negative torque is greater than the cover plate gravity torque, wherein the part exceeding the cover plate gravity torque is used as the comprehensive torque to drive the cover plate to open. When the cover plate 2 is locked in the closed position S0, the comprehensive torque is locked.

[0062] After the cover plate 2 is unlocked by manually operating the buckle 51 (the unlocking process can be seen in Figure 18 to Figure 21 ), the comprehensive torque in the opening direction is released, and the cover plate 2 enters the power-assisted opening section I. In this section, as the opening angle of the cover plate 2 gradually increases, the angle at which the positive torsion spring 41 is compressed gradually decreases, and the angle at which the negative torsion spring 42 is compressed gradually increases. Therefore, the stored positive torque gradually decreases, the negative torque gradually increases, and the cover plate gravity torque gradually decreases. When the sum of the positive torque and the negative torque is equal to the cover plate gravity torque, the cover plate 2 is opened to the first position S1, and the torsion spring 41 is in the first position S2. Fig. 22The hovering state in the middle figure. As the cover 2 continues to open, the cover 2 will enter the hovering section II. In this section, as the opening angle of the cover 2 continues to increase, the angle at which the forward torsion spring 41 is compressed continues to decrease, and the angle at which the reverse torsion spring 42 is compressed continues to increase. Therefore, the stored forward torque continues to decrease, the reverse torque continues to increase, and the cover gravity torque continues to decrease, but the sum of the forward torque and the reverse torque is always kept equal to the cover gravity torque. Therefore, in this hovering drive II, the cover 2 will not open automatically, but requires artificial external force to continue to open. When the external force is removed, the cover 2 can hover at any position in this section.

[0063] When the cover plate 2 is forced to break through the second position S2 by the external force and enters the buffer zone III, in this zone, as the opening angle of the cover plate 2 further increases, the compressed angle of the positive torsion spring 41 further decreases, and the compressed angle of the reverse torsion spring 42 further increases. Therefore, the stored positive torque further decreases, and the reverse torque further increases. The change of the cover plate gravity torque is divided into two cases: when the opening angle of the cover plate 2 does not exceed 90 degrees, that is, when the cover plate 2 rotates from the second position S2 to the vertical position, the cover plate gravity torque continues to decrease, and the sum of the positive torque and the reverse torque is greater than the cover plate gravity torque, wherein, The part exceeding the cover plate gravity torque is used to drive the cover plate 2 to continue opening; when the opening angle of the cover plate exceeds 90, that is, when the cover plate 2 rotates from the vertical position to the maximum position S3, the cover plate gravity torque changes direction and gradually increases, so that the sum of the positive torque and the reverse torque is less than the cover plate gravity torque. At this time, the gravity torque is partially offset, and the remaining gravity torque is used to drive the cover plate 2 to open, but due to the gradual increase in the reverse torque, the cover plate 2 is in a slow opening state, and the closer to the maximum position S3, the slower the opening speed, thereby achieving the purpose of buffering and preventing the cover plate 2 from opening all the way and colliding with other external parts.

[0064] When the cover 2 slowly and automatically opens to the maximum position S3, the torsion spring is in Fig. 22 The fully open state is shown in the middle right figure. At this time, the limit pin 25 on the cover plate 2 moves along the limit groove 114 to the end of the limit groove 114 and is blocked, as shown in FIG. Fig.15 As shown, the cover plate 2 is limited at the maximum position S3, but under the action of the positive cover plate gravity torque that is not offset, it is possible to ensure that the cover plate 2 is stably at the maximum position S3 without shaking.

[0065] The utility model can realize the functions of assisting, hovering and buffering the opening process of the cover plate by arranging at least one positive torsion spring and at least one reverse torsion spring between the cover plate and the frame, and applying positive and reverse torques to the cover plate at the same time, and has a simple structure and low cost. At least one positive torsion spring and at least one reverse torsion spring can be combined into a variety of schemes, and the structure is more flexible and can be adapted to various different cover plate structures.

[0066] The utility model is described in detail above in conjunction with the embodiments of the drawings. A person skilled in the art can make various variations of the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation of the utility model, and the scope of protection of the utility model shall be defined by the scope of the attached claims.

Claims

1. A handrail structure, comprising: Skeleton; a cover that flips between a closed position and a maximum position relative to the skeleton by a rotating shaft, during which a first position and a second position are passed; characterized in that: The armrest structure further comprises a torsion spring group connected between the cover plate and the frame, wherein the torsion spring group comprises at least one positive torsion spring and at least one reverse torsion spring sleeved on the rotating shaft; The torsion spring group is configured to provide a counter torque to the cover plate to resist the gravity torque of the cover plate.

2. The handrail structure according to claim 1, characterized in that: A first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all negative torsion springs gradually decrease and increase as the cover plate is opened, respectively, and during the process of the cover plate rotating from the closed position to the first position, the sum of the first total torque and the second total torque is greater than the gravity torque of the cover plate.

3. The handrail structure according to claim 1, characterized in that: A first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all negative torsion springs gradually decrease and increase as the cover plate is opened, respectively, and during the process of the cover plate rotating from the first position to the second position, the sum of the first total torque and the second total torque is equal to the gravity torque of the cover plate.

4. The handrail structure according to claim 1, characterized in that: A first total torque provided by all positive torsion springs of the torsion spring group and a second total torque provided by all reverse torsion springs gradually decrease and increase as the cover plate opens, respectively, and during the process of the cover plate rotating from the second position to the vertical position, the sum of the first total torque and the second total torque is greater than the gravity torque of the cover plate, and during the process of the cover plate rotating from the vertical position to the maximum position, the sum of the first total torque and the second total torque is less than the gravity torque of the cover plate.

5. The handrail structure according to claim 1, characterized in that: The torsion spring group includes at least one torsion spring pair, and the torsion spring pair is formed by connecting one of the positive torsion springs and one of the negative torsion springs.

6. The handrail structure according to claim 5, characterized in that: A cantilever of the forward torsion spring and a cantilever of the reverse torsion spring of the torsion spring pair are connected to form a hanging portion, and the hanging portion is connected to the cover plate.

7. The handrail structure according to claim 6, characterized in that: The skeleton is provided with a socket connected to one of the other cantilever of the forward torsion spring of the torsion spring pair and the other cantilever of the reverse torsion spring, and an introduction groove connected to the other cantilever of the forward torsion spring of the torsion spring pair and the other cantilever of the reverse torsion spring.

8. The handrail structure according to claim 7, characterized in that: One end of the introduction groove extends to the edge of the frame to form an opening.

9. The handrail structure according to claim 1, characterized in that: The cover plate is provided with a limit pin, and the frame is provided with a limit groove. When the cover plate is opened, the limit pin extends into the limit groove and is blocked by the limit groove to limit the maximum opening position of the cover plate.

10. The handrail structure according to claim 1, characterized in that: At least one pair of mounting ears is provided on one of the cover plate and the frame, and a mounting groove for each pair of mounting ears to be inserted is provided on the other of the cover plate and the frame, and an axial hole for the rotating shaft to pass through is opened on each pair of mounting ears and the mounting groove, so that the cover plate can be flipped relative to the frame through the rotating shaft.

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