CN203555395U - Chair and functional rack thereof - Google Patents
Chair and functional rack thereof Download PDFInfo
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- CN203555395U CN203555395U CN201320592871.8U CN201320592871U CN203555395U CN 203555395 U CN203555395 U CN 203555395U CN 201320592871 U CN201320592871 U CN 201320592871U CN 203555395 U CN203555395 U CN 203555395U
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Abstract
The utility model discloses a chair and a functional rack thereof. The functional rack comprises foot rest plate connecting frames, connecting members A, connecting members B, connecting members C, connecting members D, middle connecting frames, seat connecting frames, connecting members E, connecting members F, connecting members G, connecting members H, backrest connecting frames, connecting members I, connecting members J, connecting members K, connecting members L and connecting members M, which are respectively arranged on the left and right sides of a base in pairs; four-link mechanisms are formed by the foot rest plate connecting frames, the connecting members A, the connecting members B and the connecting members C, and four-link mechanisms are formed by the connecting members B, the connecting members C, the connecting members D and the seat connecting frames; four-link mechanisms are formed by the seat connecting frames, the connecting members H, the middle connecting frames and the connecting members G, and four-link mechanisms are formed by the middle connecting frames, the connecting members E, the connecting members F and the base; four-link mechanisms are formed by the backrest connecting frames, the seat connecting frames, the connecting members I and the connecting members J. According to the technical scheme of the utility model, the action is stable, the use is comfortable, the structure is reasonable, and the space is saved.
Description
Technical field
The utility model belongs to field of furniture, relates in particular to a kind of seat such as chaise longue, sofa etc., relates in particular to the functional frame of wherein using.
Background technology
Traditionally, furniture such as chaise longue, sofa etc. can be provided with actuating mechanism---functional frame, the chair frame that backrest, cushion and leg-placing plate etc. form is installed in this functional frame, and functional frame is for realizing interconnecting between the chair frame of action and motionless base assembly.Functional frame is the combination of various mechanical fasteners normally, and this mechanical fastener is exercisable to various comfortable performances are provided, the motion that independently couches of for example seat assemblies, and the tumbling of tensile actuating of putting leg assembly and relevant chair frame.Although the chaise longue of many routines can operate satisfactorily, furnitur manufacturers still constantly pursue the improved chair frame of development and functional frame, to reduce the complexity of system, the stationarity that improves operation and occupant's comfortableness.In addition, expect constantly the improved manufacturing technology of development and mounting technology, this will cause the reduction of cost the help raise efficiency raising of efficiency and the improvement of product quality simultaneously.
Summary of the invention
In order to solve above-mentioned technical problem, one of the purpose of this utility model is to provide a kind of functional frame of seat, mechanical linkage structure is improved, to reduce the complexity of system, stationarity and the comfort of raising operation.
Two of the purpose of this utility model is to provide a kind of seat, comprises above-mentioned functions frame.
To achieve the above object, the utility model has adopted following technical scheme:
A kind of functional frame of seat, comprise base, the left and right sides of base is separately installed with leg-placing plate link, connector A, connector B, connector C, connector D, middle link, cushion link, connector E, connector F, connector G, connector H, backrest link, connector I, connector J, connector K, connector L and the connector M that left and right arranges in pairs, one end of one end of described leg-placing plate link and connector A is hinged, one end of the other end of connector A and connector C is hinged, the upper front part of the other end of connector C and cushion link is hinged, one end of the other end of leg-placing plate link and connector B is hinged, one end of the other end of connector B and connector D is hinged, the upper front part of the other end of connector D and cushion link is hinged, connector B and connector C mutually intersect and are hinged at crossover location, like this, leg-placing plate link, connector A, connector B and connector C form quadric chain, connector B, connector C, connector D and cushion link form quadric chain, two connector C that left and right is oppositely arranged are fixedly connected with synchronous rotation by left and right connecting rod, one drive unit rotates before and after driving connector C, described cushion link is anterior hinged with one end of connector H, the other end of connector H and middle link front portion are hinged, one end of described cushion link rear portion and connector G is hinged, the other end of connector G and middle link rear portion are hinged, cushion link like this, connector H, middle link and connector G form quadric chain, in the middle of described, link is anterior hinged with the upper end of connector E, the lower end of connector E and base front portion are hinged, in the middle of described, the upper end of link rear portion and connector F is hinged, the lower end of connector F and base rear portion are hinged, link like this, connector E, connector F and base form quadric chain, the upper end of the centre of described backrest link and connector I is hinged, the lower end of connector I and cushion link rear portion are hinged, the upper end of the lower end of backrest link and connector J is hinged, the lower end of connector J and cushion link rear portion are hinged, backrest link like this, cushion link, connector I and connector J form quadric chain, one end of described connector K and middle link rear portion are hinged, the lower end of the other end of connector K and connector L is hinged, the centre of connector L and cushion link rear portion are hinged, the lower end of the upper end of connector L and connector M is hinged, the centre of the upper end of connector M and connector I or connector J is hinged, wherein, between described cushion link and connector D, be provided with the restriction connector D position limiting structure A of slewing area forward, described base or middle link are provided with the position limiting structure B of restriction connector E and connector F scope of activities, and described middle link or cushion link are provided with the position limiting structure C of restriction connector G and connector H scope of activities.
In this programme, provide the drive unit of power to only have one, leg-placing plate is arranged on two quadric chains that connect each other, by Power Drive Unit, drive two quadric chain interlocks, thereby realize the conversion of leg-placing plate between lifting status and down state, and in this transfer process, the variable in distance between leg-placing plate and cushion is very little, avoid leg-placing plate to rub with the hands and drawn trouser legs, improved comfort.The middle link structure that employing can seesaw, can be before leg-placing plate lifts or simultaneously, impels cushion link to produce and moves forward, and has improved like this interlock reasonability of leg-placing plate and cushion and user's comfort.When leg-placing plate is during to lifting status, by position limiting structure A, two quadric chains of leg-placing plate and cushion link are connected as a single entity, the power that drives forwards of drive unit is just applied on cushion link like this, drive cushion link to move forward, between cushion link and middle link, form quadric chain, between middle link and base, form quadric chain, cushion link and upper cushion thereof are forward swing lifting process upwards like this, simultaneously, because with connector I or the hinged connector M of connector J via connector L, connector K is connected with middle link, and the centre of connector L and cushion link are hinged, so, in the lifting process forward of cushion link, the quadric chain of the installation backrest at cushion link rear portion also changes, impel backrest to move forward and topple over gradually, realized the interlock of cushion and backrest, avoided the stranding of waist clothing to draw, improved comfort, and, this programme structure has also realized by wall and having toppled over, even if be that seat backrest when sitting up straight state leans on wall, also still can directly realize and lie down action, and in prior art, all need to leave a segment distance to implement to lie down action between the backrest of seat and wall, thereby this programme structure is more convenient to use and save space.
Above-mentioned drive unit can be directly or indirectly to drive any actuating unit rotating before and after connector C, such as cylinder, motor etc.As preferably, described drive unit is push-rod electric machine, and push-rod electric machine is arranged on base, and the moving slider of push-rod electric machine and one end of push rod are hinged, and the other end of push rod and left and right connecting rod are hinged.
Above-mentioned position limiting structure A can directly or indirectly limit connector D any structure of slewing area forward, such as limited post, block etc., as preferably, position limiting structure A is the limited post being fixed on cushion link or connector D, direct so spacing simple and convenient, Stability Analysis of Structures.In addition, position limiting structure A is not limited to rigid limit structure, can be also elastic spacing structure, for example, extension spring, the two ends of extension spring are connection cushion link and connector D respectively.
Above-mentioned position limiting structure B can be any structure that can directly or indirectly limit connector E and connector F scope of activities, such as limited post, block etc., as preferably, described position limiting structure B is the limited post being fixed on base or middle link, direct so spacing simple and convenient, Stability Analysis of Structures.In addition, position limiting structure B is not limited to rigid limit structure, can be also elastic spacing structure, for example extension spring.
Above-mentioned position limiting structure C can be can directly or indirectly limit connector G and connector H scope of activities any structure, such as limited post, block etc., as preferably, described position limiting structure C is the limited post being fixed on middle link or cushion link, direct so spacing simple and convenient, Stability Analysis of Structures.In addition, position limiting structure B is not limited to rigid limit structure, can be also elastic spacing structure, for example extension spring.
As preferably, the pin joint of described connector C and cushion link is positioned at the front of the pin joint of connector D and cushion link.Like this structural design more rationally, more simple and reliable.
As preferably, the pin joint of described connector J and cushion link is positioned at the front of the pin joint of connector L and cushion link, and the pin joint of connector L and cushion link is positioned at the front of the pin joint of connector I and cushion link.Like this structural design more rationally, more simple and reliable.
As preferably, between described cushion link and base, extension spring is installed.Can reduce as much as possible like this unstability of linkage, improve action stability, reliability, support strength and the comfort of functional frame.
As preferably, the pin joint of described backrest link and connector J is attached with top back that can pushing tow cushion rear end, and two backrest links or connector J that the two ends of this top back are oppositely arranged with left and right are respectively fixedly connected with.On the jack-up position of the quadric chain of backrest, top back is set, makes it at backrest, lie down in process upwards pushing tow cushion rear end, the sponge of cushion rear end is lifted in right amount, improved greatly the comfort of seat.
As preferably, described cushion link is provided with and gives all the time the elastic potential energy mechanism of backrest link near cushion link trend.Can reduce as much as possible like this unstability of linkage, improve action stability, reliability, support strength and the comfort of functional frame.Described elastic potential energy mechanism can be extension spring or other elastomeric elements, is preferably extension spring, and extension spring has multiple set-up mode, for example, between described connector I and connector L, extension spring is installed.
A kind of seat, comprise functional frame as above, on two cushion links that described left and right is oppositely arranged, fixedly mount cushion seat, on cushion seat, fixedly mount cushion, the upper end fixed installation back seat of two backrest links that described left and right is oppositely arranged, on back seat, fixedly mount backrest, on two leg-placing plate links that described left and right is oppositely arranged, fixedly mount leg-placing plate.
The utility model, owing to having adopted above technical scheme, improves mechanical linkage structure, has reduced the complexity of system, has improved stationarity, the comfort of action, easy to use, rational in infrastructure, saving space.
Accompanying drawing explanation
Fig. 1 is the structural representation (seat state) of embodiment 1 seat;
Fig. 2 is the stereogram (seat state) of embodiment 1 functional frame;
Fig. 3 is the action schematic diagram (seat state) of embodiment 1 functional frame;
Fig. 4 is the action schematic diagram (shifting state before cushion link) of embodiment 1 functional frame;
Fig. 5 is the action schematic diagram (leg-placing plate lifting status) of embodiment 1 functional frame;
Fig. 6 is the action schematic diagram (state of lying) of embodiment 1 functional frame;
Fig. 7 is the stereogram of embodiment 2 functional frame.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is made a detailed explanation.
Embodiment 1:
The functional frame of a kind of seat as shown in Figures 2 to 6, comprise base 16, the left and right sides of base 16 is separately installed with leg-placing plate link 6, connector A7, connector B8, connector C9, connector D10, middle link 24, cushion link 13, connector E11, connector F17, connector G22, connector H25, backrest link 21, connector I19, connector J23, connector K14, connector L18 and the connector M20 that left and right arranges in pairs, one end of one end of described leg-placing plate link 6 and connector A7 is hinged, one end of the other end of connector A7 and connector C9 is hinged, the upper front part of the other end of connector C9 and cushion link 13 is hinged, one end of the other end of leg-placing plate link 6 and connector B8 is hinged, one end of the other end of connector B8 and connector D10 is hinged, the upper front part of the other end of connector D10 and cushion link 13 is hinged, connector B8 and connector C9 mutually intersect and are hinged at crossover location, like this, leg-placing plate link 6, connector A7, connector B8 and connector C9 form quadric chain, connector B8, connector C9, connector D10 and cushion link 13 form quadric chain, two connector C9 that left and right is oppositely arranged are fixedly connected with synchronous rotation by left and right connecting rod 26, one drive unit rotates before and after driving connector C9, described cushion link 13 is anterior hinged with one end of connector H25, the other end of connector H25 and middle link 24 are anterior hinged, one end of described cushion link 13 rear portions and connector G22 is hinged, the other end of connector G22 and middle link 24 rear portions are hinged, cushion link 13 like this, connector H25, middle link 24 and connector G22 form quadric chain, in the middle of described, link 24 is anterior hinged with the upper end of connector E11, the lower end of connector E11 and base 16 are anterior hinged, in the middle of described, the upper end of link 24 rear portions and connector F17 is hinged, the lower end of connector F17 and base 16 rear portions are hinged, link 24 like this, connector E11, connector F17 and base 16 form quadric chain, the upper end of the centre of described backrest link 21 and connector I19 is hinged, the lower end of connector I19 and cushion link 13 rear portions are hinged, the upper end of the lower end of backrest link 21 and connector J23 is hinged, the lower end of connector J23 and cushion link 13 rear portions are hinged, backrest link 21 like this, cushion link 13, connector I19 and connector J23 form quadric chain, one end of described connector K14 and middle link 24 rear portions are hinged, the lower end of the other end of connector K14 and connector L18 is hinged, the centre of connector L18 and cushion link 13 rear portions are hinged, the lower end of the upper end of connector L18 and connector M20 is hinged, the centre of the upper end of connector M20 and connector I19 is hinged, like this, connector L18, connector M20, connector I19 and cushion link 13 form quadric chain.Wherein, between described cushion link 13 and connector D10, be provided with the restriction connector D10 position limiting structure A of slewing area forward, described base 16 or middle link 24 are provided with the position limiting structure B of restriction connector E11 and connector F17 scope of activities, and described middle link 24 or cushion link 13 are provided with the position limiting structure C of restriction connector G22 and connector H25 scope of activities.
In the present embodiment, described drive unit is push-rod electric machine 15, and push-rod electric machine 15 is arranged on base 16, and one end of the moving slider of push-rod electric machine 15 and push rod 12 is hinged, and the other end of push rod 12 and left and right connecting rod 26 are hinged.Described position limiting structure A is the limited post being fixed on cushion link 13 or connector D10.Described position limiting structure B is the limited post being fixed on base 16 or middle link 24.Described position limiting structure C is the limited post being fixed on middle link 24 or cushion link 13.The pin joint of described connector C9 and cushion link 13 is positioned at the front of the pin joint of connector D10 and cushion link 13.The pin joint of described connector J23 and cushion link 13 is positioned at the front of the pin joint of connector L18 and cushion link 13, and the pin joint of connector L18 and cushion link 13 is positioned at the front of the pin joint of connector I19 and cushion link 13.Between described cushion link 13 and base 16, extension spring is installed.Described backrest link 21 and the pin joint of connector J23 are attached with top back (not drawing on figure) that can pushing tow cushion 2 rear ends, and two backrest links 21 or connector J23 that the two ends of this top back are oppositely arranged with left and right are respectively fixedly connected with.Described cushion link 13 is provided with and gives all the time the elastic potential energy mechanism of backrest link 21 near cushion link 13 trend.Between described connector I19 and connector L18, extension spring is installed.Two connector J23 that described left and right is oppositely arranged are fixedly connected with and are synchronized with the movement by left and right connecting rod, two connector E11 that described left and right is oppositely arranged are fixedly connected with and are synchronized with the movement by left and right connecting rod, and two middle links 24 that described left and right is oppositely arranged are fixedly connected with and are synchronized with the movement by left and right connecting rod.
A kind of seat as shown in Figure 1, comprise functional frame as above, on two cushion links 13 that described left and right is oppositely arranged, fixedly mount cushion seat 1, on cushion seat 1, fixedly mount cushion 2, the upper end fixed installation back seat 3 of two backrest links 21 that described left and right is oppositely arranged, on back seat 3, fixedly mount backrest 4, on two leg-placing plate links 6 that described left and right is oppositely arranged, fixedly mount leg-placing plate 5.
As shown in Figure 3, functional frame is in seat state, when push-rod electric machine 15 promotes two connector C9 forward time by left and right connecting rod 26, cushion link 13 and middle link 24 move forward, as shown in Figure 4, two quadric chains action of leg-placing plate, until leg-placing plate is during to lifting status, as shown in Figure 5, then, connector D10 is connected as a single entity by spacing itself and the cushion link 13 of making of limited post, push-rod electric machine 15 driving force forward is just applied directly on cushion link 13 like this, drive cushion link 13 to move forward, between cushion link 13 and base 16, form quadric chain, cushion link 13 and upper cushion thereof are forward swing lifting process upwards like this, simultaneously, because with the hinged connector M20 of connector I19 via connector L18, connector K14 is connected with middle link 24, and the centre of connector L18 and cushion link 13 rear portions are hinged, so, moving forward in process of cushion link 13, the quadric chain of the installation backrest at cushion link 13 rear portions also changes, impel backrest to move forward and topple over gradually, the state until lie, as shown in Figure 6.Otherwise in push-rod electric machine 15 reseting procedures, cushion link 13 successively moves, backrest is holded up gradually, and then leg-placing plate puts down.
Embodiment 2:
The functional frame of a kind of seat as shown in Figure 7, only be from the different of embodiment 1: one end of described connector K14 and middle link 24 rear portions are hinged, the lower end of the other end of connector K14 and connector L18 is hinged, the centre of connector L18 and cushion link 13 rear portions are hinged, the lower end of the upper end of connector L18 and connector M20 is hinged, the centre of the upper end of connector M20 and connector J23 is hinged, like this, connector L18, connector M20, connector J23 and cushion link 13 form quadric chain.Other are identical with embodiment 1.Its operating principle and process are also close with embodiment 1.
It is emphasized that: be only preferred embodiment of the present utility model above, not the utility model is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above embodiment, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. the functional frame of a seat, it is characterized in that, comprise base (16), the left and right sides of base (16) is separately installed with the leg-placing plate link (6) that left and right arranges in pairs, connector A(7), connector B(8), connector C(9), connector D(10), middle link (24), cushion link (13), connector E(11), connector F(17), connector G(22), connector H(25), backrest link (21), connector I(19), connector J(23), connector K(14), connector L(18) and connector M(20), one end of described leg-placing plate link (6) and connector A(7) one end hinged, connector A(7) the other end and connector C(9) one end hinged, connector C(9) the other end and the upper front part of cushion link (13) hinged, the other end of leg-placing plate link (6) and connector B(8) one end hinged, connector B(8) the other end and connector D(10) one end hinged, connector D(10) the other end and the upper front part of cushion link (13) hinged, connector B(8) and connector C(9) mutually intersect and hinged at crossover location, like this, leg-placing plate link (6), connector A(7), connector B(8) and connector C(9) formation quadric chain, connector B(8), connector C(9), connector D(10) and cushion link (13) formation quadric chain, two connector C(9 that left and right is oppositely arranged) by left and right connecting rod (26), be fixedly connected with synchronous rotation, one drive unit drives connector C(9) front and back rotation, described cushion link (13) anterior with connector H(25) one end hinged, connector H(25) the other end and middle link (24) anterior hinged, described cushion link (13) rear portion and connector G(22) one end hinged, connector G(22) the other end and middle link (24) rear portion hinged, cushion link (13) like this, connector H(25), middle link (24) and connector G(22) formation quadric chain, in the middle of described link (24) anterior with connector E(11) upper end hinged, connector E(11) lower end and base (16) anterior hinged, link (24) rear portion and connector F(17 in the middle of described) upper end hinged, connector F(17) lower end and base (16) rear portion hinged, link (24) like this, connector E(11), connector F(17) and base (16) formation quadric chain, the centre of described backrest link (21) and connector I(19) upper end hinged, connector I(19) lower end and cushion link (13) rear portion hinged, the lower end of backrest link (21) and connector J(23) upper end hinged, connector J(23) lower end and cushion link (13) rear portion hinged, backrest link (21) like this, cushion link (13), connector I(19) and connector J(23) formation quadric chain, described connector K(14) one end and middle link (24) rear portion hinged, connector K(14) the other end and connector L(18) lower end hinged, connector L(18) centre and cushion link (13) rear portion hinged, connector L(18) upper end and connector M(20) lower end hinged, connector M(20) upper end and connector I(19) or connector J(23) centre hinged, wherein, described cushion link (13) and connector D(10) between be provided with restriction connector D(10) the position limiting structure A of slewing area forward, described base (16) or middle link (24) are provided with restriction connector E(11) and connector F(17) the position limiting structure B of scope of activities, described in the middle of link (24) or cushion link (13) be provided with limit connector G(22) and connector H(25) the position limiting structure C of scope of activities.
2. the functional frame of a kind of seat according to claim 1, it is characterized in that, described drive unit is push-rod electric machine (15), push-rod electric machine (15) is arranged on base (16), one end of the moving slider of push-rod electric machine (15) and push rod (12) is hinged, and the other end of push rod (12) and left and right connecting rod (26) are hinged.
3. the functional frame of a kind of seat according to claim 1, is characterized in that, described position limiting structure A is for being fixed on cushion link (13) or connector D(10) on limited post.
4. the functional frame of a kind of seat according to claim 1, is characterized in that, described position limiting structure B is for being fixed on the limited post on base (16) or middle link (24).
5. the functional frame of a kind of seat according to claim 1, is characterized in that, described position limiting structure C is the limited post on link (24) or cushion link (13) in the middle of being fixed on.
6. the functional frame of a kind of seat according to claim 1, it is characterized in that, described connector J(23) be positioned at connector L(18 with the pin joint of cushion link (13)) with the front of the pin joint of cushion link (13), connector L(18) be positioned at connector I(19 with the pin joint of cushion link (13)) and with the front of the pin joint of cushion link (13).
7. the functional frame of a kind of seat according to claim 1, is characterized in that, between described cushion link (13) and base (16), extension spring is installed.
8. the functional frame of a kind of seat according to claim 1, it is characterized in that, described backrest link (21) and connector J(23) pin joint be attached with can pushing tow cushion (2) rear end top back, two backrest links (21) or connector J(23 that the two ends of this top back are oppositely arranged with left and right respectively) be fixedly connected with.
9. the functional frame of a kind of seat according to claim 1, is characterized in that, described cushion link (13) is provided with and gives all the time the elastic potential energy mechanism of backrest link (21) near cushion link (13) trend.
10. a seat, comprise functional frame as claimed in any one of claims 1-9 wherein, it is characterized in that, two cushion links (13) upper fixed installation cushion seats (1) that described left and right is oppositely arranged, cushion seat (1) upper fixed installation cushion (2), the upper end fixed installation back seat (3) of two backrest links (21) that described left and right is oppositely arranged, back seat (3) upper fixed installation backrest (4), two leg-placing plate links (6) upper fixed installation leg-placing plates (5) that described left and right is oppositely arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320592871.8U CN203555395U (en) | 2013-09-24 | 2013-09-24 | Chair and functional rack thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320592871.8U CN203555395U (en) | 2013-09-24 | 2013-09-24 | Chair and functional rack thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203555395U true CN203555395U (en) | 2014-04-23 |
Family
ID=50505154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320592871.8U Expired - Lifetime CN203555395U (en) | 2013-09-24 | 2013-09-24 | Chair and functional rack thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203555395U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103549782A (en) * | 2013-09-24 | 2014-02-05 | 鲍月娥 | Seat and functional rack |
| CN112174048A (en) * | 2020-10-22 | 2021-01-05 | 华北水利水电大学 | Double-layer forklift based on double four-bar linkage mechanism |
-
2013
- 2013-09-24 CN CN201320592871.8U patent/CN203555395U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103549782A (en) * | 2013-09-24 | 2014-02-05 | 鲍月娥 | Seat and functional rack |
| CN103549782B (en) * | 2013-09-24 | 2015-10-28 | 浙江永艺家具股份有限公司 | A kind of seat and functional frame thereof |
| CN112174048A (en) * | 2020-10-22 | 2021-01-05 | 华北水利水电大学 | Double-layer forklift based on double four-bar linkage mechanism |
| CN112174048B (en) * | 2020-10-22 | 2021-10-22 | 华北水利水电大学 | Double-layer forklift based on double four-bar linkage mechanism |
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