Electric chair base and electric chair comprising same

Abstract

The utility model provides an electric chair base which is provided with a first base, a second base and a third base, the second base is arranged on the first base and can tilt backwards and swing, the third base is arranged on the second base and can move up and down, a lifting telescopic rod pulls the third base to move up and down, and when the third base descends to the bottommost point, the lifting telescopic rod pulls the third base to move up and down. As the third base cannot descend any more, the second base can be driven to incline backwards and swing, and therefore the single telescopic rod can be used for controlling the lifting height adjusting action and the swinging and inclining action, the lifting mechanism has the advantages of being simple in structure and diversified in action, the use function of freely adjusting the height is provided under the condition that the cost is controllable, and the lifting mechanism has excellent market value.

Description

Technical Field

[0001] The utility model relates to an electric chair. Background Art

[0002] Existing electric chairs, as described in the Chinese Taiwan patent TWI548372, can provide the user with a reclining position and present specific front azimuth angles between the seat frame, the backrest frame and the leg rest frame, and can support the user's back, buttocks and legs with three specific-angle support surfaces, providing the use functions of the so-called "zero-gravity chair" or "weightless chair".

[0003] On the other hand, because the elderly or the disabled may have difficulty standing up from a sitting position due to the degeneration of the knees and other joints or muscles, there are rising chairs that can assist in standing up. The seat of the rising chair can be driven by electricity to swing forward and tilt, and the rear side thereof rises, directly lifting and pushing forward the user's buttocks, making the user's posture close to standing up. In this way, the standing-up movement can be more labor-saving and easier.

[0004] In order to improve the comfort and user experience of the rising chair, the backrest and leg rest of the rising chair can usually also be tilted or lifted by electricity. For example, the Chinese Taiwan patent TWM487727 describes a rising chair. In the standing-up state, the seat cushion is tilted forward by a telescopic power device, and at the same time the backrest also swings forward to move the back forward to facilitate standing up, and the leg rest is retracted backward to avoid interfering with standing up; in addition, when sitting, the seat cushion can also be tilted backward by a telescopic power device, and at the same time the backrest reclines and the leg rest extends forward and upward to provide the user with the lying posture of a "zero-gravity chair", combining comfort and labor-saving.

[0005] However, there is still room for improvement in the control of the seat surface height of existing rising chairs. Due to the different heights and the lengths of various parts of the torso of the human body, the seat surface heights that are slightly higher and slightly lower than the knees may only differ by less than 5 cm, but this will bring a great difference in the user's experience. Especially when the rising chair tilts to assist in standing up, an inappropriate seat surface height may cause the user to have difficulty standing up or poor balance and fall. For the electric chairs and rising chairs in the aforementioned Chinese Taiwan patents TWI548372 and TWM487727, if the seat surface height is to be adjusted, it can only be customized according to the user or an additional telescopic power device is added to adjust the seat surface height, which will greatly increase the cost and selling price of the rising chair. Summary of the Utility Model

[0006] One of the purposes of the utility model is to provide an electric chair that has the function of adjusting the seat surface height without causing excessive complication of the mechanism and increasing the cost.

[0007] Accordingly, the present utility model provides an electric chair base, comprising a first base, a second base, a third base, a first link group and a lifting telescopic rod. The second base is disposed on the first base and can swing relative to the first base about a horizontal axis. The first link group is connected to the second base and the third base, such that the third base can move up and down between a lowering position close to the second base and a rising position away from the second base. The lifting telescopic rod is connected to one of the third base and the first link group and the first base, and the lifting telescopic rod can telescopically move between a first lifting length, an intermediate lifting length and a second lifting length. The intermediate lifting length is between the first lifting length and the second lifting length. When the lifting telescopic rod telescopically moves between the first lifting length and the intermediate lifting length, it drives the third base to move up and down between the rising position and the lowering position. When the lifting telescopic rod is at the intermediate lifting length, the third base is at the lowering position. When the lifting telescopic rod telescopically moves between the intermediate lifting length and the second lifting length, the second base swings relative to the first base about the horizontal axis.

[0008] In the aforesaid electric chair base, the first link group may further comprise a first lifting rod and an auxiliary rod. One end of the first lifting rod is slidably and pivotably disposed on one of the second base and the third base, and the auxiliary rod is pivotally connected to one of them and the first lifting rod. The other end of the first lifting rod is pivotally connected to the other of the second base and the third base. When the first lifting rod and the auxiliary rod pivot, the third base can move up and down between the lowering position and the rising position.

[0009] In the aforesaid electric chair base, the first link group may further comprise a first balance rod. One end of the first balance rod is slidably and pivotably disposed on one of the second base and the third base along with the first lifting rod, and the other end is pivotally connected to the other of the second base and the third base.

[0010] In the aforesaid electric chair base, one of the second base and the third base may further comprise a slide rail. The first link group comprises a slide seat which is slidably disposed on the slide rail. The first lifting rod is pivotally connected to the slide seat. Preferably, the first balance rod is also pivotally connected to the slide seat.

[0011] In the aforesaid electric chair base, the first link group may further comprise a boosting rod. The boosting rod is connected to one of the auxiliary rod and the first lifting rod and swings therewith. One end of the lifting telescopic rod is pivotally connected to the boosting rod, and the other end is pivotally connected to the first base.

[0012] In the aforementioned electric chair base, it may further include a fourth base, a sub-base, and a standing telescopic rod. The fourth base can swing relative to the third base. The fourth base has a limiting portion. The sub-base is pivotally connected to the fourth base and can pivotally swing relative to the fourth base to abut or not abut against the limiting portion. The standing telescopic rod is connected to the third base and the sub-base. The standing telescopic rod can telescopically move between a first standing length, an intermediate standing length, and a second standing length. The intermediate standing length is between the first standing length and the second standing length. When the standing telescopic rod telescopically moves between the first standing length and the intermediate standing length, it drives the sub-base to swing relative to the fourth base. When the standing telescopic rod is at the intermediate standing length, the sub-base abuts against the limiting portion. When the standing telescopic rod moves from the intermediate standing length to the second standing length, the sub-base abuts against the limiting portion and pushes the fourth base to swing relative to the third base.

[0013] In the aforementioned electric chair base, it may further include a second link group. The second link group includes a second lifting rod and a second balance rod. The second lifting rod is pivotally connected to the third base and the fourth base. The second balance rod is pivotally connected to the third base and the fourth base. The third base, the second lifting rod, the fourth base, and the second balance rod form a four-bar linkage mechanism so that the fourth base can swing closer to or away from the third base.

[0014] Secondly, the present invention also provides an electric chair, including a seat portion and a backrest portion. The seat portion and the backrest portion are located above the third base of the aforementioned electric chair base and are driven to move when at the third base. Preferably, the seat portion can be arranged on the fourth base, and the backrest portion can be arranged on the sub-base.

[0015] Thereby, the present invention can use a single mechanism of the lifting telescopic rod to control the lifting and reclining of the third base, enabling the electric chair to have the functions of adjusting the seat surface height and the seat reclining. Additionally, the single mechanism of the standing telescopic rod can be further used to control the forward swing of the fourth base and the backward swing of the sub-base, enabling the electric chair to have the functions of assisting in standing up and the backrest reclining. With limited mechanisms and components, and without excessively increasing the cost, sufficient usage functions are provided. Description of the Drawings

[0016] Figure 1 Is a perspective view of the electric chair according to the first embodiment of the present invention.

[0017] Figure 2 Is an exploded perspective view of the electric chair according to the first embodiment of the present invention.

[0018] Figure 3 Is an exploded perspective view of the electric chair according to the first embodiment of the present invention from another perspective.

[0019] Figure 4 This is a three-dimensional exploded view of the base of the electric chair according to the first embodiment of the present utility model.

[0020] Figure 5 This is a partial three-dimensional exploded view of the base of the electric chair according to the first embodiment of the present utility model.

[0021] Figure 6 This is a side view of the electric chair according to the first embodiment of the present utility model.

[0022] Figure 7 This is a schematic diagram of the mechanism of the first base, the second base and the third base of the base of the electric chair according to the first embodiment of the present utility model.

[0023] Figures 8 to 9 This is a schematic diagram of the operation of the lifting telescopic rod of the base of the electric chair according to the first embodiment of the present utility model.

[0024] Figure 10 This is a schematic diagram of the mechanism of the third base, the fourth base and the auxiliary base of the base of the electric chair according to the first embodiment of the present utility model.

[0025] Figures 11 to 12 This is a schematic diagram of the operation of the getting-up telescopic rod of the base of the electric chair according to the first embodiment of the present utility model.

[0026] Figure 13 This is a schematic diagram of the operation of adjusting the height of the electric chair according to the first embodiment of the present utility model.

[0027] Figure 14 This is a schematic diagram of the assisting getting-up operation of the electric chair according to the first embodiment of the present utility model.

[0028] Figure 15 This is a schematic diagram of the lying-down operation of the electric chair according to the first embodiment of the present utility model.

[0029] Figure 16 This is a schematic diagram of the "zero-gravity chair" operation of the electric chair according to the first embodiment of the present utility model.

[0030] Figure 17 This is a side view of the electric chair according to the second embodiment of the present utility model.

[0031] Figure 18 This is a schematic diagram of the mechanism of the first base, the second base and the third base of the base of the electric chair according to the second embodiment of the present utility model.

[0032] Description of reference numerals: seat portion 10; backrest portion 20; headrest portion 21; footrest portion 30; first base 40; pivoting portion 41; pivoting seat 42; second base 50; mounting portion 51; supporting portion 52; pivoting seat 53; sliding rail 54; third base 60; sliding rail 61; first link group 70; first lifting rod 71; auxiliary rod 72; first balance rod 73; sliding seat 74; boosting rod 75; pivoting shaft 76; lifting telescopic rod 80; fourth base 90; pivoting portion 91; limiting portion 92; secondary base 100; backrest bracket 101; abutting seat 102; standing-up telescopic rod 110; second link group 120; second lifting rod 121; second balance rod 122; footrest link group 130; footrest telescopic rod 140. Detailed implementation manners

[0033] To enable a further understanding of the present utility model, a preferred embodiment is given below in conjunction with the drawings and described in detail as follows:

[0034] Please refer to Figures 1 to 3 , the present utility model provides an electric chair, including an electric chair base below and a seat portion 10, a backrest portion 20 and a footrest portion 30 mounted on the electric chair base. Imagining the situation where a human body sits on the seat portion 10 and leans against the backrest portion 20 can define the up and down longitudinal direction such as Figure 1 the up and down direction, the left and right transverse direction such as Figure 1 the lower left to upper right direction and the front and back direction such as Figure 1 the upper left and lower right direction. Depending on the usage requirements and form of the electric chair, the backrest portion 20 and the footrest portion 30 can be removed and omitted, and the related mechanisms such as the backrest bracket, the footrest link group, and the footrest telescopic rod used to install the backrest portion 20 and the footrest portion 30 in the electric chair base described later can also be removed and omitted. The seat portion 10, the backrest portion 20 and the footrest portion 30 are used to provide functions such as human body support, buffering, and soft and comfortable touch, and can respectively support the human buttocks, back and legs. Preferably, the backrest portion 20 extends upward or is connected to another cushion to form a headrest portion 21. Depending on the usage requirements, appropriate massage, heating, heat preservation, ventilation and other devices or a combination device with any number of the above functions can be provided inside or on the surface of the seat portion 10, the backrest portion 20 and the footrest portion 30, so as to provide multiple usage functions on the electric chair.

[0035] Please refer to Figures 4 to 6, the electric chair base includes a first base 40, a second base 50, a third base 60, a first link group 70, a lifting telescopic rod 80, a fourth base 90, a secondary base 100, a standing-up telescopic rod 110, a second link group 120, a footrest link group 130, and a footrest telescopic rod 140. It should be specifically noted that since the electric chair and the electric chair base are generally left-right symmetric mechanisms, for the convenience of description, the present utility model mainly uses the necessary structures on the left or right from the perspective of the side view to illustrate the overall mechanism. For the rods and links mentioned in the present utility model, in the case of having appropriate cross-sectional shapes and dimensions, it is possible to use a single rod, but it is not limited to the necessity of using a single long strip-shaped rod. It may also be a pair of rods, a group of rods, an I-shaped frame, a square frame, a rectangular frame, or other similar members with a side view in a straight line shape.

[0036] The first base 40 is located at the bottom of the electric chair base for placement on the ground or other stable support locations. Other silent pads or cushion pads can also be added below the first base 40. The first base 40 has a pivot portion 41 and a pivot seat 42. Specifically, the pivot portion 41 is a perforation extending along the horizontal axis in the transverse direction.

[0037] The second base 50 is disposed on the first base 40 and can swing relative to the first base 40 about the horizontal axis defined by the pivot portion 41. Specifically, the second base 50 is pivotally connected to the pivot portion 41 of the first base 40. The second base has a mounting portion 51, a bearing portion 52, and a pivot seat 53. The mounting portion 51 is located at the rear side of the pivot portion 41, the bearing portion 52 is located at the front side of the pivot portion 41, and the lower part of the bearing portion 52 abuts against the first base 40, so that when the second base 50 swings, it can only swing backward and cannot swing forward. The pivot seat 53 is located at the front side of the bearing portion 52. The second base also has a slide rail 54, and the slide rail 54 is installed and fixed on the mounting portion 51.

[0038] The first link group includes a first lifting rod 71, an auxiliary rod 72, a first balance rod 73, a sliding seat 74 and a boosting rod 75. The bottom end of the first lifting rod 71 is slidably and pivotally arranged on the second base 50, and the top end is pivotally connected to the third base 60. The bottom end of the auxiliary rod 72 is pivotally connected to the pivot seat 53 of the second base 50, and the top end is pivotally connected to the first lifting rod 71, so that the third base 60 can move up and down relative to the second base 50 when the first lifting rod 71 and the auxiliary rod 72 pivot; more specifically, the bottom end of the first lifting rod 71 is pivotally connected to the sliding seat 74, and the sliding seat 74 is slidably arranged on the slide rail 54, so that the first lifting rod 71 can slide and swing relative to the second base 50; in other possible embodiments of the present invention, if the bottom end of the first lifting rod has a convex portion and the second base has a channel, the convex portion of the first lifting rod is slidably and rotatably arranged in the channel of the second base, and the aforementioned slide rail and sliding seat can be removed and omitted. The first balance rod 73 is arranged in the same structure as the first lifting rod 71, the bottom end is pivotally connected to the sliding seat 74, and the top end is pivotally connected to the third base 60, so that the first balance rod 73 can support and drive the third base 60 to move together with the first lifting rod 71, so that the third base 60 keeps translating without tilting or only having slight swinging when moving up and down. However, if the third base 60 has other mechanisms to assist in keeping translation, or the third base 60 can swing freely, the first balance rod 73 can also be removed and omitted. For example, if the top end of the auxiliary rod is extended upward and the end is slidably and pivotally arranged on the third base, the auxiliary rod can assist the third base to keep balance. The boosting rod 75 is connected to the auxiliary rod 72 and swings together with the auxiliary rod 72. More clearly, the first link group further includes a pivot shaft 76, and both the auxiliary rod 72 and the boosting rod 75 are directly connected to the pivot shaft 76, and the pivot shaft 76 is rotatably arranged on the pivot seat 53. In other possible embodiments of the present creation, if the boosting rod 75 is directly connected to the auxiliary rod 72, or the boosting rod 75 is directly or indirectly connected to the first lifting rod 71, they are all feasible specific implementation manners.

[0039] One end of the lifting telescopic rod 80 is pivotally connected to the assisting rod 75, and the other end is pivotally connected to the pivot seat 42. When the lifting telescopic rod 80 expands and contracts, it can push the assisting rod 72 to swing through the assisting rod 75, further driving the assisting rod 72 and the first lifting rod 71 to pivot, so that the third base 60 moves up and down. The aforesaid assisting rod 75 can provide a better pivotal connection position for the lifting telescopic rod 80 to output a better torque to the assisting rod 72. In other possible embodiments of the present invention, the lifting telescopic rod can also be directly pivotally connected to the assisting rod to remove and omit the assisting rod, or pivotally connect the lifting telescopic rod to other components of the first link group, such as the first lifting rod, and still drive the first lifting rod and the assisting rod to pivot when the lifting telescopic rod expands and contracts; in addition, if the top end of the lifting telescopic rod is directly or indirectly pivotally connected or connected to the third base through other mechanisms, it is also possible to drive the third base to move up and down by the lifting telescopic rod. At this time, the first link group may also be changed to a slide rail extending vertically or obliquely up and down, as long as the third base can move up and down relative to the second base.

[0040] Please refer to Figures 7 to 9 , the lifting telescopic rod 80 can expand and contract between the first lifting length, the intermediate lifting length and the second lifting length, wherein the intermediate lifting length is between the first lifting length and the second lifting length. As Figure 7 shown, when the lifting telescopic rod 80 is at the intermediate lifting length, the third base 60 is in the lowered position. At this time, the slide block 74 is located at the rear end of the slide rail 54, and the third base 60 cannot be further lowered. As Figure 7 and Figure 8 shown, when the lifting telescopic rod 80 expands and contracts from the intermediate lifting length to the first lifting length and elongates, the lifting telescopic rod 80 pushes the assisting rod 75, and then drives the assisting rod 72 and the first lifting rod 71 to pivot. The slide block 74 moves forward along the slide rail 54, so that the third base 60 moves upward to the raised position. As Figure 7 and Figure 9 shown, when the lifting telescopic rod 80 expands and contracts from the intermediate lifting length to the second lifting length and shortens, since the third base 60 is already in the lowered position and cannot be further lowered, the third base 60 pushes against the second base 50 through the pivot shaft 76 and the pivot seat 53 and the slide block 74 and the slide rail 54, causing the second base 50 to tilt backward and swing.

[0041] Please refer to Figures 4 to 6, the fourth base 90 is located above the third base 60. The fourth base 90 is provided for the seat part to be fixed. The second link group is connected between the fourth base 90 and the third base 60, so that the fourth base 90 can swing relative to the third base 60. More specifically, the second link group includes a second lifting rod 121 and a second balance rod 122. The second lifting rod 121 and the second balance rod 122 are respectively pivotally connected to the third base 60 and the fourth base 90. The second lifting rod 121, the fourth base 90, the second balance rod 122 and the third base 60 form a planar four-bar linkage mechanism, so that the fourth base 90 can swing closer to or away from the third base 60; However, if the fourth base 90 is pivotally connected to the third base 60, thereby removing and omitting the second link group, the fourth base 90 can still have the ability to swing relative to the third base, which is acceptable. The rear side of the fourth base 90 has a pivot portion 91 and a limit portion 92.

[0042] The auxiliary base 100 is pivotally connected to the pivot portion 91 of the fourth base 90 and is located at the rear side of the fourth base. The auxiliary base 100 extends upward and has a backrest bracket 101 for the backrest part to be fixed. The auxiliary base 100 has a abutment seat 102. When the auxiliary base 100 pivots relative to the fourth base 90, the abutment seat 102 will approach and abut against the limit portion 92 or move away without abutting against the limit portion 92.

[0043] The stand-up telescopic rod 110 is pivotally connected to the third base 60 and the auxiliary base 100. When the stand-up telescopic rod 110 expands and contracts, it can push the auxiliary base 100 and / or the fourth base 90 to swing. Please refer to Figures 10 to 12 , the stand-up telescopic rod 110 can expand and contract between a first stand-up length, a middle stand-up length and a second stand-up length. Among them, the middle stand-up length is between the first stand-up length and the second stand-up length. As Figure 10 and Figure 11 shown, when the stand-up telescopic rod 110 expands and contracts between the first stand-up length and the middle stand-up length, the fourth base 90 is abutted against the third base 60 or the second link group below as Figure 6 shown and cannot swing downward. The stand-up telescopic rod 110 will drive the auxiliary base 100 to swing relative to the fourth base 90. Since the backrest is fixed to the auxiliary base 100, the swing of the auxiliary base 100 can further control the tilt and upright of the backrest. As Figure 11 shown, when the stand-up telescopic rod is at the middle stand-up length, the auxiliary base 100 swings until the abutment seat 102 contacts and abuts against the limit portion 92. At this time, the backrest will correspondingly present an upright posture. As Figure 11 and Figure 12As shown, when the lifting telescopic rod 110 further telescopically moves from the middle lifting length to the second lifting length, since the sub-base 100 abuts against the limiting portion 92, the sub-base 100 cannot swing upward relative to the fourth base 90. The extension of the lifting telescopic rod 110 to the second lifting length causes the sub-base 100 to push against the fourth base 90 upward through the limiting portion 92, causing the fourth base 90 to swing relative to the third base 60. Since the seat portion is fixed to the fourth base 90, as Figure 12 shown, the forward tilting swing of the fourth base will provide the use effect of assisting in getting up.

[0044] Please refer to Figures 4 to 6 , the footrest link group 130 and the footrest telescopic rod 140 are arranged on the third base. The footrest link group 130 can be used for the footrest portion 30 to be fixedly arranged, and the link mechanism of the footrest link group 130 is driven by the footrest telescopic rod 140 to translate and swing, thereby pushing the footrest portion 30 to extend and unfold and retract.

[0045] The above-mentioned electric chair base can achieve the use functions of assisting in getting up and adjusting the height of the seat surface. Please refer to Figure 6 and Figure 13 , the lifting telescopic rod 80 can extend to drive the first lifting rod 71 and the auxiliary rod 72 of the first link group to pivot, driving the third base 60 to move up and down. The seat portion 10, the backrest portion 20 and the footrest portion 30 arranged above the third base 60 also move up and down together to adjust the height. Please refer to Figure 13 and Figure 14 , the lifting telescopic rod 110 can extend to drive the sub-base 100 and the fourth base 90 to tilt forward, causing the seat portion 10 and the backrest portion 20 to tilt forward, which can assist the user to stand up. Since the functions of adjusting the height and assisting in getting up come from the lifting telescopic rod driving the third base to move up and down and the lifting telescopic rod driving the fourth base to swing respectively, the height of the third base will not affect the swing of the fourth base and its function of assisting in getting up. The seat portion 10 can normally start the use function of assisting in getting up at any adjusted height, so that the electric chair can arbitrarily adjust the height of the seat surface according to the user's needs.

[0046] In addition to the above functions, the electric chair base of the present invention can also provide a reclining function, and even a lying posture of a so-called "zero-gravity chair". Please refer to Figure 15 , the lifting telescopic rod 110 can also shorten to drive the sub-base 100 to tilt backward, which can cause the backrest portion 20 to tilt backward. At the same time, the footrest telescopic rod 140 can drive the footrest link group 130 to push the footrest portion 30 forward to unfold, allowing the user to lie down. Please refer to Figure 15 and Figure 16 , the lifting telescopic rod 80 can further shorten to drive the second base 50 to tilt backward, allowing the user to lie down further and obtaining a more comfortable lying posture.

[0047] It should be specifically noted that the above-mentioned electric chair has the functions of adjusting height, assisting in getting up, and lying down in a "zero-gravity chair". However, when only the functions of adjusting height and tilting the seat surface are required, components such as the second link group, the fourth base, the auxiliary base, and the getting-up telescopic rod are removed and omitted, and the seat part is directly or indirectly arranged on the third base, which also belongs to the possible specific implementation manners of the present invention.

[0048] Please refer to Figure 17 and Figure 18 , in another embodiment of the present invention, the first lifting rod, the auxiliary rod, and the first balance rod in the first link group can also be arranged upside down without affecting the foregoing use functions. More specifically, the top end of the first lifting rod 71 is slidably and pivotally arranged on the third base 60, and the bottom end is pivotally connected to the pivot seat 53 of the second base 50. The top end of the auxiliary rod 72 is pivotally connected to the third base 60, and the bottom end is pivotally connected to the first lifting rod 71, so that when the first lifting rod 71 and the auxiliary rod 72 pivot, the third base 60 can move up and down relative to the second base 50. Further explaining, the top end of the first lifting rod 71 is pivotally connected to the sliding seat 74, the third base 60 has a slide rail 61, and the sliding seat 74 is slidably arranged on the slide rail 61, so that the first lifting rod 71 can slide and swing relative to the third base 60. The first balance rod 73 is arranged in the same structure as the first lifting rod 71, the top end is pivotally connected to the sliding seat 74, and the bottom end is pivotally connected to the second base 50, so that the first balance rod 73 can support and drive the third base 60 to move together with the first lifting rod 71, and keep the third base 60 moving in translation without tilting or only having a slight swing when the third base 60 moves up and down. The assisting rod 75 is connected to the first lifting rod 71 and swings together with the first lifting rod 71. The lifting telescopic rod 80 is pivotally connected to the assisting rod and the pivot seat 42 of the second base. When the lifting telescopic rod 80 expands and contracts, the first lifting rod 71 can be driven by the assisting rod 75 to pivot, thereby driving the third base 60 to move up and down. Or after the third base 60 descends to the descending position and cannot descend further, the second base 50 is pushed by the third base 60 to tilt and pivot backward, realizing the same use functions as the foregoing embodiments.

[0049] To sum up the above description, the present invention provides the functions of adjusting height and tilting the seat surface with the lifting telescopic rod and related components in the electric chair base. The mechanism is simple and has diverse functions. If the getting-up telescopic rod and related components are added, it will be more complete and have the use functions of adjusting height, assisting in getting up, and lying down in a "zero-gravity chair". The mechanism is simple and the actions of the components are simple and easy to understand, which is beneficial to the control system and related operation settings, and can effectively control the manufacturing cost, and has great market value.

Claims

1. An electric chair base, characterized in that: Include: a first base; A second base, disposed on the first base and capable of swinging relative to the first base around a horizontal axis; a third base; a first connecting rod assembly connected to the second base and the third base, so that the third base can be lifted and lowered between a lowered position close to the second base and an elevated position away from the second base; A lifting and telescopic rod is connected to the third base and one of the first connecting rod groups and the first base. The lifting and telescopic rod can be telescopically moved between a first lifting length, an intermediate lifting length and a second lifting length. The intermediate lifting length is between the first lifting length and the second lifting length. When the lifting and telescopic rod is telescopically moved between the first lifting length and the intermediate lifting length, it drives the third base to move up and down between the ascending position and the descending position. When the lifting and telescopic rod is at the intermediate lifting length, the third base is located at the descending position. When the lifting and telescopic rod is telescopically moved between the intermediate lifting length and the second lifting length, the second base swings around the horizontal axis relative to the first base.

2. The electric chair base according to claim 1, characterized in that: The first connecting rod assembly includes a first lifting rod and an auxiliary rod. One end of the first lifting rod is slidably and pivotally arranged on one of the second base and the third base, and the auxiliary rod is pivotally connected to the one of the second base and the first lifting rod. The other end of the first lifting rod is pivotally connected to the other of the second base and the third base. When the first lifting rod and the auxiliary rod are pivotally swung, the third base can be lifted and moved between the lowered position and the raised position.

3. The electric chair base according to claim 2, characterized in that: The first connecting rod assembly further comprises a first balancing rod, one end of which is slidably and pivotally arranged on one of the second base and the third base along with the first lifting rod, and the other end of which is pivotally connected to the other of the second base and the third base.

4. The electric chair base according to claim 2, characterized in that: One of the second base and the third base includes a slide rail, the first connecting rod assembly includes a slide seat, the slide seat is slidably arranged on the slide rail, and the first lifting rod is pivotally connected to the slide seat.

5. The electric chair base according to claim 3, characterized in that: One of the second base and the third base includes a slide rail, the first connecting rod assembly includes a slide seat, the slide seat is slidably arranged on the slide rail, the first lifting rod is pivotally connected to the slide seat, and the first balancing rod is pivotally connected to the slide seat.

6. The electric chair base according to claim 2, characterized in that: The first connecting rod assembly further comprises a power rod, which is connected to one of the auxiliary rod and the first lifting rod to swing together, one end of the lifting telescopic rod is pivotally connected to the power rod, and the other end is pivotally connected to the first base.

7. The electric chair base according to any one of claims 1 to 6, characterized in that: The lifting device also includes a fourth base, a sub-base and a telescopic rod for standing, the fourth base being able to swing relative to the third base, the fourth base having a limiting portion, the sub-base being pivotally connected to the fourth base and being able to pivot relative to the fourth base and to abut against or not against the limiting portion, the telescopic rod for standing being connected to the third base and the sub-base, the telescopic rod for standing being able to telescopically move between a first standing length, an intermediate standing length and a second standing length, the intermediate standing length being between the first standing length and the second standing length, when the telescopic rod for standing being telescopically moved between the first standing length and the intermediate standing length, the sub-base is driven to swing relative to the fourth base, when the telescopic rod for standing being is at the intermediate standing length, the sub-base abuts against the limiting portion, and when the telescopic rod for standing being moves from the intermediate standing length to the second standing length, the sub-base abuts against the limiting portion and pushes the fourth base to swing relative to the third base.

8. The electric chair base according to claim 7, characterized in that: The invention also comprises a second connecting rod group, which comprises a second lifting rod and a second balancing rod. The second lifting rod is pivotally connected to the third base and the fourth base, and the second balancing rod is pivotally connected to the third base and the fourth base. The third base, the second lifting rod, the fourth base and the second balancing rod form a four-bar linkage so that the fourth base can swing closer to or away from the third base.

9. An electric chair, comprising the electric chair base according to any one of claims 1 to 6, characterized in that: The utility model also comprises a seat part and a chair back part, wherein the seat part and the chair back part are located above the third base and are driven to move by the third base when the third base moves.

10. An electric chair, comprising the electric chair base according to any one of claims 7 to 8, characterized in that: The utility model also comprises a seat part and a backrest part. The seat part is arranged on the fourth base and moves with it, and the backrest part is arranged on the auxiliary base and moves with it.

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