Chair frame capable of converting stress

Abstract

According to the stress-converted chair frame, when a first driving device drives a front swing rod to drive a seat frame to ascend, gravitational potential energy generated by backward toppling of a back frame acts on a rear swing rod through a third connecting rod and a second connecting rod in sequence, so that the seat frame is assisted to ascend; when the first driving device drives the front swing rod to drive the seat frame to descend, gravitational potential energy generated by the seat frame sequentially passes through the second connecting rod and the third connecting rod to act on the back frame through the rear swing rod, and therefore the back frame is assisted to ascend. By utilizing the conversion of gravitational potential energy in the lifting process of the seat frame and the back frame, all power in the lifting process of the chair frame is prevented from coming from the first driving device, the stress of driving parts and structural parts is reduced, the stability of the first driving device is improved, the service life of the first driving device is prolonged, and the cost of the chair frame is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of massage chair frames, and in particular to a chair frame with force conversion. Background Art

[0002] In the current design of massage chairs, the driving force of the chair frame during the lifting process is completely dependent on the drive device, which leads to high performance requirements for the drive device and its transmission system. In addition, the calf support structure usually adopts a scissor-type multi-link mechanism to achieve the lifting function, but this mechanism has a potential risk of pinching. At the same time, during the retraction process of the calf structure, there may also be a risk of pinching between the leg board and the side board or the ground. Summary of the invention

[0003] The present invention provides a chair frame with force transformation, which solves at least one problem existing in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A force-transformed chair frame, characterized in that it comprises a base frame, a seat frame and a back frame for a user to lean on, and further comprises:

[0006] A front swing rod and a rear swing rod, both ends of the front swing rod and both ends of the rear swing rod are respectively hinged to the base frame and the seat frame, so that the front swing rod, the seat frame, the rear swing rod and the base are hinged to each other in sequence to form a four-bar linkage;

[0007] A back frame linkage assembly, comprising a first link, a second link and a third link which are hinged in sequence, wherein the end of the first link is hinged on the base, and the middle of the second link is hinged on the rear swing rod;

[0008] One end of the back frame is provided with a first hinge point and a second hinge point spaced apart from each other, the first hinge point is hinged to the seat frame, and the end of the third connecting rod is hinged to the second hinge point; and

[0009] A first driving device, one end of which is hinged to the chassis, and the other end of which is hinged to the front swing arm or the rear swing arm;

[0010] When the first driving device drives the front swing bar or the rear swing bar to swing counterclockwise, the rear swing bar will drive the second connecting rod to move, and the movement of the second connecting rod will pull the second hinge point of the back frame through the third connecting rod, so that the back frame tilts backward, and the torque change generated by the back frame tilting backward will act on the rear swing bar through the back frame linkage assembly, thereby assisting the rear swing bar to swing counterclockwise;

[0011] When the first driving device drives the front swing arm or the rear swing arm to swing clockwise, the rear swing arm will drive the second connecting rod to move, and the movement of the second connecting rod will pull the second hinge point of the back frame through the third connecting rod, so that when the back frame is lifted forward, the torque change generated by the lifting of the back frame forward will act on the rear swing arm through the back frame linkage assembly, thereby assisting the clockwise swing of the rear swing arm.

[0012] Furthermore, the back frame is hinged with a leg-lifting part and a push rod, an elastic member is connected between the push rod and the leg-lifting part, and further comprises a second driving device with one end hinged to the seat frame and the other end hinged to the push rod;

[0013] When the output end of the second driving device extends, the push rod pushes the leg lifting part to rise; when the output end of the second driving device retracts and the leg lifting part is blocked from descending, the push rod can be detached from the leg lifting part, and the push rod applies a retraction force to the leg lifting part through the elastic member.

[0014] Further, the leg lifting part includes a lifting connecting rod assembly, and the connecting rod assembly includes:

[0015] A calf connecting rod and a calf pushing rod, wherein the middle parts of the calf connecting rod and the calf pushing rod are hinged to each other, and one end of the calf connecting rod is hinged to the seat frame;

[0016] An abutment rod, one end of which is hinged to the seat frame, and the other end of which is hinged to one end of the calf push rod, and the elastic member is provided between the push rod and the abutment rod;

[0017] A support rod, one end of which is hinged to the other end of the calf connecting rod;

[0018] It also includes a support plate, which is hinged to the other end of the calf push rod and the other end of the support rod respectively.

[0019] Furthermore, the abutment rod and the push rod are hinged to the rotation axis of one end of the seat frame and are coaxially arranged.

[0020] Furthermore, the push rod is provided with a first push position, and the abutment rod is provided with a second push position which is concave-convexly matched with the first push position.

[0021] Furthermore, the abutment rod includes a first abutment section and a second abutment section connected to each other, a first angle is formed between the first abutment section and the second abutment section, one of the first abutment section and the second abutment section is hinged to the seat frame, and the other is hinged to one end of the calf push rod, and the space between the abutment rod and the second connecting rod constitutes a first anti-pinch space.

[0022] Furthermore, the support rod includes a first supporting section and a second supporting section connected to each other, a second angle is defined between the first abutting section and the second abutting section, one of the first connecting section and the second connecting section is hinged to one end of the calf connecting rod, and the other is hinged to the support plate, and the space between the support rod and the first connecting rod constitutes a second anti-pinch space.

[0023] Furthermore, the longer one of the first abutting section and the second abutting section is hinged to the seat frame, and the shorter one is hinged to one end of the calf push rod; the shorter one of the first connecting section and the second connecting section is hinged to the other end of the calf connecting rod, and the longer one is hinged to the support plate.

[0024] Furthermore, the back frame is provided with a connecting seat, the abutment rod is hinged to one side of the connecting seat, and the calf connecting rod is hinged to the other side of the connecting seat.

[0025] Furthermore, it also includes a transfer block, one side of the transfer block is hinged to the calf connecting rod, and the other side of the transfer block is hinged to the calf pushing rod.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention proposes a chair frame with force conversion. When the first driving device drives the front swing bar or the rear swing bar to drive the seat frame to rise, the gravity potential energy generated by the back frame tilting backward acts on the rear swing bar through the third link and the second link in sequence, assisting the rear swing bar to swing counterclockwise, thereby assisting the seat frame to rise; when the first driving device drives the front swing bar or the rear swing bar to drive the seat frame to fall, the gravity potential energy generated by the seat frame acts on the back frame through the rear swing bar through the second link and the third link in sequence, assisting the rear swing bar to swing clockwise, thereby assisting the back frame to rise. By utilizing the conversion of gravity potential energy of the seat frame and the back frame during the lifting process, it is avoided that all the power during the lifting process of the chair frame comes from the first driving device, the force on the driving components and structural components is reduced, the stability and life of the first driving device are increased, and the cost of the chair frame is reduced.

[0028] 2. The present invention proposes a chair frame with force transformation, in which a back frame is hinged with a leg lifting part and a push rod, and an elastic member is connected between the push rod and the leg lifting part. When the output end of the second drive device retracts and the descent of the leg lifting part is blocked, the push rod can be separated from the leg lifting part, and the push rod applies the retraction force to the leg lifting part through the elastic member. At this time, the blocked position is subject to the pulling force generated by the elastic member, which prevents the rigid retraction force of the second drive device from directly acting on the blocked position, thereby ensuring the safety of the machine and personnel.

[0029] 3. In a chair frame with force conversion proposed by the present invention, the rotating shafts of the abutment rod and the push rod hinged to one end of the seat frame are coaxially arranged. During the pushing process, the push rod is kept stationary relative to the abutment rod, thereby reducing the friction between the push rod and the abutment rod.

[0030] 4. The present invention proposes a force-transforming chair frame, wherein the abutment rod comprises a first abutment section and a second abutment section connected to each other, wherein a first angle is formed between the first abutment section and the second abutment section, and the support rod comprises a first support section and a second support section connected to each other, wherein a second angle is formed between the first abutment section and the second abutment section, so that the abutment rod and the support rod are L-shaped, and when the calf is in a contracted state, the space between the abutment rod and the second connecting rod constitutes a first anti-pinch space, and the space between the support rod and the first connecting rod constitutes a second anti-pinch space, so as to avoid pinching the user or damage to the connecting rod caused by squeezing of foreign objects.

[0031] 5. The present invention proposes a force-transforming chair frame, in which a back frame is provided with a connecting seat, an abutment rod is hinged on one side of the connecting seat, and a calf connecting rod is hinged on the other side of the connecting seat, so that a safety gap is provided between a first connecting rod group consisting of the abutment rod and the second connecting rod and a second connecting rod group consisting of the second connecting rod and the supporting rod to avoid pinching.

[0032] 6. In a chair frame with force transformation proposed by the present invention, a transfer block is provided between the first connecting rod and the second connecting rod to ensure a safe gap between the first connecting rod and the second connecting rod assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of a chair frame with force transformation according to the present invention;

[0035] Figure 2 A side view of a force-transformed chair frame of the present invention;

[0036] Figure 3 An exploded view of a force-transformed chair frame of the present invention;

[0037] Figure 4 It is a schematic diagram of a back frame of a force-transformed chair frame of the present invention in an upright state;

[0038] Figure 5 A schematic diagram of a back frame of a chair frame subjected to force transformation according to the present invention tilting backwards;

[0039] Figure 6 It is a diagrammatic illustration of the leg-lifting part of a chair frame with force conversion according to the present invention;

[0040] Figure 7It is a schematic diagram of a leg-lifting part of a force-transformed chair frame of the present invention being blocked from descending;

[0041] Figure 8 for Figure 7 A partial enlarged view of the middle part;

[0042] Fig. 9 It is a schematic diagram of a lifting connecting rod assembly in the prior art;

[0043] Fig.10 It is one of the schematic diagrams of a lifting link assembly of a chair frame with force conversion of the present invention;

[0044] Fig.11 The second schematic diagram of a lifting connecting rod assembly of a chair frame with force conversion according to the present invention;

[0045] Fig.12 The third schematic diagram of a lifting connecting rod assembly of a chair frame with force conversion of the present invention;

[0046] In the figure, 10, chassis; 20, seat frame; 301, front swing rod; 302, rear swing rod; 40, back frame linkage assembly; 401, first link; 402, second link; 403, third link; 50, back frame; 60, adapter; 601, first hinge point; 602, second hinge point; 70, leg lifting part; 701, calf link; 702, calf push rod; 703, abutment rod; 7031, first abutment section; 7032, second abutment section Two abutment sections; 704, support rod; 7041, first support section; 7042, second support section; 705, support plate; 80, elastic member; 90, push rod; 1001, first anti-pinch space; 1002, second anti-pinch space; 1101, first push position; 1102, second push position; 1201, first driving device; 1202, second driving device; 130, connecting seat; 140, adapter block; 150, safety gap. DETAILED DESCRIPTION

[0047] Combine the following Figure 1-Figure 12 The present invention is described in detail.

[0048] This embodiment provides a force-transformed chair frame, comprising a base frame 10 and a seat frame 20, and further comprising:

[0049] The swing arm device includes a front swing arm 301 and a rear swing arm 302 , and both ends of the front swing arm 301 and the rear swing arm 302 are hinged to the base frame 10 and the seat frame 20 respectively.

[0050] The back frame linkage assembly 40 includes a first connecting rod 401, a second connecting rod 402 and a third connecting rod 403 which are hinged in sequence.

[0051] The back frame 50 includes an adapter 60, one end of which is fixed on the back frame 50, and the other end is provided with a first hinge point 601 and a second hinge point 602 which are spaced apart from each other. The first hinge point 601 is hinged to the seat frame 20, and the second hinge point 602 is hinged to the third link 403. During assembly, the middle part of the second link 402 is hinged to the rear swing arm 302, so that when the rear swing arm 302 swings, it will drive the second link 402 to move, and the movement of the second link 402 will be transmitted to the adapter 60 through the hinge with the first link 401 and the third link 403, so that the adapter 60 drives the back frame 50 to rotate relative to the seat frame 20.

[0052] One end of the first driving device 1201 is hinged to the base frame 10 , and the other end is hinged to the front swing bar 301 ; the first driving device 1201 is a motor push rod.

[0053] When the first driving device 1201 drives the front swing bar 301 or the rear swing bar 302 to swing counterclockwise, specifically, driving the rear swing bar 302 will drive the second connecting rod to move, and the movement of the second connecting rod will pull the second hinge point 602 of the back frame 50 through the third connecting rod, so that when the back frame 50 tilts backward, the torque change generated by the back frame 50 tilting backward will act on the rear swing bar 302 through the back frame 50 linkage assembly, assisting the counterclockwise swing of the rear swing bar 302. Specifically, when the back frame 50 is in a roughly upright state, such as Figure 4 As shown, the output end of the first driving device 1201 begins to extend to push the front swing bar 301 to rotate counterclockwise relative to the base frame 10. Since the front swing bar 301, the seat frame 20, the rear swing bar 302 and the base 10 form a four-bar linkage, and the length of the front swing bar 301 is greater than the length of the rear swing bar 302, the seat frame 20 rotates backward clockwise relative to the base frame 10; in this process, the back frame 50 is pulled backward by the back frame linkage assembly 40. Since the user leans on the back frame 50, the change in gravity torque generated by the backward tilting of the back frame 50 will be transmitted to the rear swing bar 302 via the third link 403 and the second link 402 in sequence, further prompting the rear swing bar 302 to rotate counterclockwise, thereby assisting the seat frame 20 to rotate through the above-mentioned four-bar linkage.

[0054] When the first driving device 1201 drives the front swing bar 301 or the rear swing bar 302 to swing clockwise, the rear swing bar 302 will drive the second link to move, and the movement of the second link will pull the second hinge point 602 of the back frame 50 through the third link, so that when the back frame 50 is lifted forward, the torque change generated by the lifting of the back frame 50 will act on the rear swing bar 302 through the back frame 50 linkage assembly, and assist the clockwise swing of the rear swing bar 302. Specifically, when the back frame 50 is in a tilting state, such as Figure 5As shown, the output end of the first driving device 1201 retracts to drive the front swing arm 301 to rotate clockwise, and at the same time, the rear swing arm 302 drives the first connecting rod 401 to rotate counterclockwise via the second connecting rod 402, thereby driving the second connecting rod 402 to rotate counterclockwise, and then acts on the back frame 50 through the third connecting rod 403, helping the back frame 50 to rise.

[0055] The chair frame proposed in this embodiment utilizes the conversion of gravitational potential energy of the seat frame 20 and the back frame 50 during the lifting process to avoid that all the power during the lifting process of the chair frame comes from the first drive device 1201, thereby reducing the stress on the drive components and structural components, increasing the stability and life of the first drive device 1201, and thus reducing the cost of the chair frame.

[0056] In this embodiment, the back frame 50 is hinged with the leg lifting part 70 and the push rod 90, and an elastic member 80 is connected between the push rod 90 and the leg lifting part 70. It also includes a second driving device 1202 with one end hinged to the seat frame 20 and the other end hinged to the push rod 90. When the output end of the second driving device 1202 is extended, the push rod 90 pushes the leg lifting part 70 to rise; when the output end of the second driving device 1202 is retracted and the leg lifting part 70 is blocked from descending, the push rod 90 can be separated from the leg lifting part 70, and the push rod 90 applies the retraction force to the leg lifting part 70 through the elastic member 80. Figure 7 and Figure 8 As shown, at this time, the blocked position is subjected to the pulling force generated by the elastic member 80, which prevents the rigid retraction force of the second driving device 1202 from directly acting on the blocked position, thereby ensuring the safety of the machine and personnel.

[0057] In this embodiment, the leg lifting unit 70 includes a lifting connecting rod assembly, and the connecting rod assembly includes:

[0058] The calf connecting rod 701 and the calf pushing rod 702, the middle parts of the calf connecting rod 701 and the calf pushing rod 702 are hinged to each other, and one end of the calf connecting rod 701 is hinged to the seat frame 20;

[0059] The abutment rod 703 has one end hinged to the seat frame 20 and the other end hinged to one end of the calf push rod 702. An elastic member 80 is provided between the push rod 90 and the abutment rod 703.

[0060] A support rod 704, one end of which is hinged to the other end of the shank link 701;

[0061] It also includes a support plate 705, which is hinged to the other end of the calf push rod 702 and the other end of the support rod 704 respectively.

[0062] In this embodiment, the abutment rod 703 and the rotation axis of the push rod 90 hinged to one end of the seat frame 20 are coaxially arranged. During the pushing process, the push rod 90 is in a stationary state relative to the abutment rod 703, reducing the friction between the push rod 90 and the abutment rod 703. Further, the push rod 90 is provided with a first pushing position 1101, and the abutment rod 703 is provided with a second pushing position 1102 that matches the first pushing position 1101 in a concave-convex manner.

[0063] In this embodiment, the abutting rod 703 includes a first abutting section 7031 and a second abutting section 7032 connected to each other, and a first angle α is formed between the first abutting section 7031 and the second abutting section 7032. 1 One of the first abutting section 7031 and the second abutting section 7032 is hinged to the seat frame 20, and the other is hinged to one end of the calf push rod 702. The space between the abutting rod 703 and the second connecting rod constitutes a first anti-pinch space 1001. Fig.10 shown.

[0064] In this embodiment, the support rod 704 includes a first support section 7041 and a second support section 7042 connected to each other, and a second angle α is formed between the first abutting section 7031 and the second abutting section 7032. 2 One of the first connecting section and the second connecting section is hinged to one end of the calf connecting rod 701, and the other is hinged to the support plate 705. The space between the support rod 704 and the first connecting rod constitutes a second anti-pinch space 1002. Fig.10 shown.

[0065] Compared to Fig. 9 The prior art lifting link assembly shown in the figure has an abutment rod 703' and a support rod 704' in a straight line shape, and the space 1001' between the abutment rod 703' and the second link and the space 1002' between the support rod 704' and the first link are relatively small, which may easily lead to the risk of pinching. The abutment rod 703 and the support rod 704 proposed in this embodiment are L-shaped, and even when the calf is in a contracted state, the first anti-pinch space 1001 and the second anti-pinch space 1002 are relatively large, thereby preventing the user from being pinched or foreign objects from squeezing the link and causing damage.

[0066] In this embodiment, the longer one of the first abutting section 7031 and the second abutting section 7032 is hinged to the seat frame 20, and the shorter one is hinged to one end of the calf push rod 702; the shorter one of the first connecting section and the second connecting section is hinged to the other end of the calf connecting rod 701, and the longer one is hinged to the support plate 705.

[0067] In this embodiment, the back frame 50 is provided with a connecting seat 130, the abutting rod 703 is hinged on one side of the connecting seat 130, and the calf connecting rod 701 is hinged on the other side of the connecting seat 130, so that a safety gap 150 is provided between the first connecting rod assembly consisting of the abutting rod 703 and the second connecting rod and the second connecting rod assembly consisting of the second connecting rod and the supporting rod 704 to avoid pinching. Further, it also includes a transfer block 140, one side of the transfer block 140 is hinged to the calf connecting rod 701, and the other side of the transfer block 140 is hinged to the calf push rod 702, so as to ensure the safety gap 150 between the first connecting rod assembly and the second connecting rod assembly.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A chair frame with force transformation, characterized in that: It includes a base frame, a seat frame and a back frame for the user to lean on, and also includes: A front swing rod and a rear swing rod, both ends of the front swing rod and both ends of the rear swing rod are respectively hinged to the base frame and the seat frame, so that the front swing rod, the seat frame, the rear swing rod and the base are hinged to each other in sequence to form a four-bar linkage; A back frame linkage assembly, comprising a first link, a second link and a third link which are hinged in sequence, wherein the end of the first link is hinged on the base, and the middle of the second link is hinged on the rear swing rod; One end of the back frame is provided with a first hinge point and a second hinge point spaced apart from each other, the first hinge point is hinged to the seat frame, and the end of the third connecting rod is hinged to the second hinge point; and A first driving device, one end of which is hinged to the chassis, and the other end of which is hinged to the front swing arm or the rear swing arm; When the first driving device drives the front swing bar or the rear swing bar to swing counterclockwise, the rear swing bar will drive the second connecting rod to move, and the movement of the second connecting rod will pull the second hinge point of the back frame through the third connecting rod, so that when the back frame tilts backward, the torque change generated by the back frame tilting backward will act on the rear swing bar through the back frame linkage assembly, thereby assisting the counterclockwise swing of the rear swing bar; When the first driving device drives the front swing arm or the rear swing arm to swing clockwise, the rear swing arm will drive the second connecting rod to move, and the movement of the second connecting rod will pull the second hinge point of the back frame through the third connecting rod, so that when the back frame is lifted forward, the torque change generated by the lifting of the back frame forward will act on the rear swing arm through the back frame linkage assembly, thereby assisting the clockwise swing of the rear swing arm.

2. A chair frame with force transformation as claimed in claim 1, characterized in that: The back frame is hinged with a leg-lifting part and a push rod, an elastic member is connected between the push rod and the leg-lifting part, and also includes a second driving device with one end hinged to the seat frame and the other end hinged to the push rod; When the output end of the second driving device extends, the push rod pushes the leg lifting part to rise; when the output end of the second driving device retracts and the leg lifting part is blocked from descending, the push rod can be detached from the leg lifting part, and the push rod applies a retraction force to the leg lifting part through the elastic member.

3. A chair frame with force transformation as claimed in claim 2, characterized in that: The leg lifting part includes a lifting link assembly, and the link assembly includes: A calf connecting rod and a calf pushing rod, wherein the middle parts of the calf connecting rod and the calf pushing rod are hinged to each other, and one end of the calf connecting rod is hinged to the seat frame; An abutment rod, one end of which is hinged to the seat frame, and the other end of which is hinged to one end of the calf push rod, and the elastic member is provided between the push rod and the abutment rod; A support rod, one end of which is hinged to the other end of the calf connecting rod; It also includes a support plate, which is hinged to the other end of the calf push rod and the other end of the support rod respectively.

4. A chair frame with force transformation as claimed in claim 3, characterized in that: The abutment rod and the push rod are hinged to the rotating shaft of one end of the seat frame and are coaxially arranged.

5. A chair frame with force transformation as claimed in claim 4, characterized in that: The push rod is provided with a first push position, and the abutment rod is provided with a second push position which is concave-convexly matched with the first push position.

6. A chair frame with force transformation as claimed in claim 3, characterized in that: The abutment rod includes a first abutment section and a second abutment section connected to each other, a first angle is formed between the first abutment section and the second abutment section, one of the first abutment section and the second abutment section is hinged to the seat frame, and the other is hinged to one end of the calf push rod, and the space between the abutment rod and the second connecting rod constitutes a first anti-pinch space.

7. A chair frame with force transformation as claimed in claim 6, characterized in that: The support rod includes a first support section and a second support section connected to each other, a second angle is formed between the first abutting section and the second abutting section, one of the first connecting section and the second connecting section is hinged to one end of the calf connecting rod, and the other is hinged to the support plate, and the space between the support rod and the first connecting rod constitutes a second anti-pinch space.

8. A chair frame with force transformation as claimed in claim 7, characterized in that: The longer one of the first abutting section and the second abutting section is hinged to the seat frame, and the shorter one is hinged to one end of the calf push rod; the shorter one of the first connecting section and the second connecting section is hinged to the other end of the calf connecting rod, and the longer one is hinged to the support plate.

9. A chair frame with force transformation as claimed in claim 3, characterized in that: The back frame is provided with a connecting seat, the abutting rod is hinged to one side of the connecting seat, and the calf connecting rod is hinged to the other side of the connecting seat.

10. A chair frame with force transformation as claimed in claim 9, characterized in that: It also includes a transfer block, one side of which is hinged to the calf connecting rod, and the other side of which is hinged to the calf pushing rod.

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