CN215502122U - Sofa frame structure and sofa - Google Patents

Abstract

The utility model discloses a sofa frame structure, comprising: the lifting mechanism is hinged to the base, the leg stretching assembly is hinged to the lifting mechanism, the electric push rod and the reset elastic piece are hinged to the lifting mechanism, the electric push rod comprises a box body, a motor and a driving mechanism, the motor and the driving mechanism are both arranged on the box body, the motor is in transmission fit with the driving mechanism, and a driving block and a sliding push rod are arranged on the driving mechanism; the box body is connected with the base, the driving block is connected with the lifting mechanism, the sliding push rod is connected with the leg stretching assembly, the driving block can drive the lifting mechanism to lift or furl relative to the base under the action of the motor, and the sliding push rod can only drive the leg stretching assembly to unfold relative to the lifting mechanism; the leg stretching assembly is elastically driven by the reset elastic piece to be folded and reset.

Description

Sofa frame structure and sofa

Technical Field

The utility model relates to the technical field of furniture, in particular to a sofa frame structure and a sofa.

Background

In the existing functional sofa, the leg rest, the seat surface and the backrest often share one driving mechanism, and the same electric push rod is used for simultaneously controlling the unfolding and folding of the leg rest, the lifting and folding of the seat surface and the tilting of the backrest so as to realize the mutual switching of postures such as the sitting posture, the lying posture and the like of the sofa.

However, the existing electric push rod only has one driving block, the driving block has bidirectional driving force (with pushing force and pulling force), and because the pulling force of the electric push rod is large and rigid, a user is not aware of the situations such as leg clamping and hand clamping easily when the leg support is folded, so that accidents are caused, and the electric push rod cannot stop in time to cause injury to continue.

Although there is an electric push rod capable of being linearly driven in one direction, when the electric push rod is applied to a functional sofa, the leg support, the seat surface and the backrest can be simultaneously operated to release the clamping of the leg support to the human body, in the process, a large force (the elastic force of a return spring, the gravity of the seat surface and the backrest, and the gravity of an object placed on the sofa or a person sitting on the sofa) needs to be overcome, the clamping force is large, the clamping is not easily released, and the anti-clamping effect in the actual use process is not ideal.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in any one of the prior art, the novel sofa frame structure is provided.

The technical scheme adopted by the utility model for solving the problems is as follows:

a sofa frame structure comprising: a base, a lifting mechanism hinged on the base, a leg stretching component hinged on the lifting mechanism, an electric push rod and a reset elastic component, wherein,

the electric push rod comprises a box body, a motor and a driving mechanism, wherein the motor and the driving mechanism are both arranged in the box body, the motor is in transmission fit with the driving mechanism, and a driving block and a sliding push rod are arranged on the driving mechanism;

the box body is connected with the base, the driving block is connected with the leg stretching assembly, the sliding push rod is connected with the lifting mechanism, the driving block can drive the lifting mechanism to lift or furl relative to the base under the action of the motor, and the sliding push rod can only drive the leg stretching assembly to unfold relative to the lifting mechanism;

the leg stretching assembly is elastically driven by the reset elastic piece to be folded and reset.

In the structure, the lifting mechanism is used for lifting and folding the sofa seat surface and inclining the backrest, and the leg stretching assembly is used for extending and folding the sofa leg support.

According to the sofa frame structure provided by the utility model, the two driving sources are arranged on one electric push rod, and the two driving sources are combined with the reset elastic piece to realize rigid lifting and folding actions of the seat surface, rigid tilting actions of the backrest, rigid unfolding actions of the leg support and elastic folding actions of the leg support, so that the problem that the function of the functional sofa cannot meet the anti-pinch function when a single electric push rod is applied is solved; when satisfying anti-pinch effect, can also reduce spare part quantity and reduction in production cost.

Further, actuating mechanism includes to the lead screw that the box extends outward, the drive block and lead screw transmission cooperation, the sliding push rod and the cooperation of drive block butt, under the effect of motor, the drive block is along the axis direction reciprocating motion of lead screw, the drive block only can drive the sliding push rod and move towards the direction of keeping away from the box. When the lead screw rotates, the driving block generates axial movement, the driving block pushes the sliding push rod to move axially in a one-way mode by abutting against the sliding push rod, and when the lead screw rotates in the other direction, the driving block axially returns, but the sliding push rod cannot be pulled back by the driving block due to the fact that the sliding push rod is not directly connected with the driving block, so that the driving block can move in a two-way straight line to drive the lifting mechanism, and the sliding push rod can only move in a one-way straight line to drive the leg stretching assembly.

Further, actuating mechanism includes to the lead screw that the box extends outward, the driving block and the lead screw transmission cooperation, the cooperation is provided with screw-nut on the lead screw, the one end that the slip push rod is close to the box can be followed the axis direction of lead screw is slided to overlap and is located on the screw-nut, under the effect of motor, the driving block is followed respectively with screw-nut the axis direction reciprocating motion of lead screw, screw-nut only can drive the slip push rod is towards keeping away from the direction of box removes. The bidirectional linear motion principle of the driving block and the one-way linear motion principle of the sliding push rod can refer to the description in the previous paragraph; in this scheme, through screw-nut drive slip push rod and do one-way rectilinear movement for slip push rod and driver block are not correlated with each other, and the accessible adjusts the assembly distance of screw-nut and driver block on the lead screw, thereby can adjust the relative distance between the tie point that slip push rod is used for connecting the flexible subassembly of shank and the tie point that the driver block is used for connecting the lifting mechanism, so that the assembly of this electric putter in the sofa frame.

Furthermore, the lifting mechanism comprises two driving connecting rod groups oppositely hinged to the base and two supporting plates respectively hinged to the upper ends of the different driving connecting rod groups, two leg telescopic assemblies are arranged, and the two leg telescopic assemblies are respectively hinged to the front ends of the different supporting plates; the leg stretching assembly is connected with the first cross rod, the supporting plates are connected with the second cross rod, the sliding push rod is connected with the first cross rod, and the driving block is connected with the second cross rod.

Therefore, after the sofa frame structure is applied to a sofa, the state of the leg support relative to the seat surface can be kept without being influenced by the lifting mechanism, and the space between the two driving connecting rod groups can be utilized to accommodate the unfolding driving mechanism and the seat surface driving mechanism, so that the space utilization rate is improved.

Furthermore, the sliding push rod is hinged to the first cross rod, the second cross rod is rotatably connected between the two support plates, the second cross rod is connected with the driving block through a connecting rod group, and the second cross rod, the connecting rod group and the driving block jointly form a crank slide rod structure; through the crank slide bar structure, the driving block drives the second cross bar to rotate within a preset rotation angle range.

Through above-mentioned structure, when starting electric putter, this sofa rack construction's expansion action can be divided into two sections: (1) the driving block drives the second cross rod to rotate, the lifting mechanism keeps not to act, and the sliding push rod can drive the leg stretching assembly to unfold or fold relative to the lifting mechanism; (2) the second cross rod is located at the limit position and cannot rotate, the driving block can drive the lifting mechanism to lift or furl relative to the base, and the lifting mechanism drives the leg telescopic assemblies to move together and keeps the leg telescopic assemblies not to move relative to the lifting mechanism. Through above-mentioned structure in order to realize the sectional type action for the flexible subassembly of shank can expand alone or draw in relatively the lifting mechanism, increases a plurality of posture states, satisfies user's multiple posture demand, increases the comfort level.

Furthermore, the linkage comprises a swing rod and a transmission rod, one end of the swing rod is fixedly connected to the second cross rod, the other end of the swing rod is hinged to one end of the transmission rod, and the other end of the transmission rod is hinged to the driving block. Therefore, the function of the crank-slide rod structure is realized by combining the second cross rod, the swing rod, the transmission rod and the driving block, the structure is simple, and the corresponding relation between the rotating angle of the second cross rod and the stroke of the driving block can be coordinated by designing different lengths of the swing rod.

Furthermore, a limiting rod is arranged on the second cross rod, and a limiting block matched with the limiting rod to limit the rotation angle of the second cross rod is arranged on the supporting plate. Therefore, the rotation angle of the second cross rod is limited by the matching of the limiting rod and the limiting block.

Furthermore, two ends of the second cross rod are respectively provided with a rotating shaft sleeve, and two supporting plates are respectively provided with a rotating hole which is matched with the rotating shaft sleeves in a rotating mode. The rotating shaft sleeve is used as a cushion layer to reduce friction, so that the production precision requirement of the second cross rod is reduced, and the production cost is reduced.

Further, the reset elastic piece is connected between the lifting mechanism and the leg stretching assembly.

The utility model also provides a sofa which uses the sofa frame structure.

In summary, the sofa frame structure provided by the utility model has the following technical effects:

according to the sofa frame structure provided by the utility model, the two driving sources are arranged on one electric push rod, and the two driving sources are combined with the reset elastic piece to realize rigid lifting and folding actions of the seat surface, rigid tilting actions of the backrest, rigid unfolding actions of the leg support and elastic folding actions of the leg support, so that the problem that the function of the functional sofa cannot meet the anti-pinch function when a single electric push rod is applied is solved; when satisfying anti-pinch effect, can also reduce spare part quantity and reduction in production cost. Other advantageous effects of the present invention will be exhibited in the detailed description.

Drawings

Fig. 1 is a schematic top view of a sofa frame structure according to embodiment 1 of the present invention;

fig. 2 is a first state diagram of the sofa frame structure according to embodiment 1 of the present invention;

FIG. 3 is an enlarged view of a portion B shown in FIG. 2;

fig. 4 is a schematic structural view of a driving block connected to a second cross bar in embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of a second cross bar connected to a support plate according to embodiment 1 of the present invention;

FIG. 6 is a second diagram illustrating a variation of the sofa frame structure according to embodiment 1 of the present invention;

FIG. 7 is a third diagram illustrating a variation of the sofa frame structure according to embodiment 1 of the present invention;

fig. 8 is a schematic structural view of an electric putter in accordance with embodiment 1 of the present invention;

FIG. 9 is an exploded view of the power putter of FIG. 1;

FIG. 10 is a cross-sectional schematic view of the power putter of FIG. 1;

FIG. 11 is an enlarged view of part A of FIG. 10;

fig. 12 is a schematic structural view of the sliding rod, the screw rod, the fixed guide rod and the fixing buckle according to embodiment 1 of the present invention;

fig. 13 is a schematic structural view of an electric putter in embodiment 2 of the present invention;

fig. 14 is a schematic structural view of the sliding rod, the lead screw nut, the fixing guide rod and the fixing buckle according to embodiment 2 of the present invention.

Description of reference numerals:

1. an electric push rod; 11. a box body; 12. a motor; 13. a drive block; 14. a sliding push rod; 141. a rod body; 142. a slide base; 1421. a chute; 143. a connector; 15. a screw rod; 16. a feed screw nut; 17. fixing the guide rod; 171. a stroke assembly; 172. a limit switch; 173. a guide strip; 18. a fixing buckle; 181. a through hole; 2. a base; 3. a lifting mechanism; 31. a drive linkage; 32. a support plate; 321. a limiting block; 322. rotating the hole; 33. a second cross bar; 331. a limiting rod; 332. rotating the shaft sleeve; 34. a linkage; 341. a swing rod; 342. a transmission rod; 35. a backrest assembly; 36. pre-tightening the spring; 4. a leg telescoping assembly; 41. a first cross bar; 5. the elastic member is reset.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and the detailed description below:

in the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Example 1

Referring to fig. 1 to 12, the present invention provides a sofa frame structure for solving the problem that the functional sofa cannot satisfy the anti-pinch function when a single electric push rod is applied. The utility model also provides a sofa with the sofa frame structure.

In this embodiment, the sofa frame structure comprises a base 2, a lifting mechanism 3, a leg stretching assembly 4, an electric push rod 1 and a return elastic piece 5.

Wherein, the base 2 is used as a supporting part for supporting on the ground; the lifting mechanism 3 is used as a supporting part for supporting the sofa seat surface and is hinged to the base 2; the leg stretching assembly 4 is hinged to the lifting mechanism 3, and the front end of the leg stretching assembly 4 is connected with a leg support which is used for supporting the leg of a rider; the electric push rod 1 is provided with two driving sources, wherein one driving source has a bidirectional driving force for driving the lifting mechanism 3 to lift or furl relative to the base 2, the other driving source only has a unidirectional driving force for driving the leg stretching assembly 4 to unfold relative to the lifting mechanism 3, and the leg stretching assembly 4 is elastically driven by the reset elastic piece 5 to furl and reset.

Referring to fig. 1 and 2, in particular, the electric putter 1 includes: the device comprises a box body 11, a motor 12, a driving mechanism, a driving block 13, a sliding push rod 14 and a fixed guide rod 17, wherein the motor 12 and the driving mechanism are arranged on the box body 11, the motor 12 is in transmission fit with the driving mechanism, and the driving block 13 and the sliding push rod 14 are arranged on the driving mechanism; the box 11 is connected with base 2, and the drive block 13 is connected with lifting mechanism 3, and the slip push rod 14 is connected with shank telescoping component 4, and under the effect of motor 12, the drive block 13 can come and go the removal in order to drive lifting mechanism 3 and to lift or draw in relative base 2, and the slip push rod 14 can only unidirectional movement in order to drive shank telescoping component 4 and to expand relative lifting mechanism 3.

The lifting mechanism 3 is provided with a backrest component 35 and a pre-tightening spring 36, and when the lifting mechanism 3 is lifted or folded, the lifting mechanism 3 drives the backrest component 35 to tilt synchronously; the pretension spring 36 is used to connect between the lifting mechanism 3 and the base 2 to provide a pulling force to achieve pretension.

It should be noted that the specific structures of the leg stretching assembly 4, the base 2 and the lifting mechanism 3 are well known to those skilled in the art, and therefore, the specific structures thereof will not be described.

By the above scheme, the driving block 13 and the sliding push rod 14 are combined in the electric push rod 1, and two driving sources are formed by the driving block 13 and the sliding push rod 14, and are driven simultaneously by the same motor 12 and the driving mechanism, wherein the driving block 13 has bidirectional driving force (having pushing force and pulling force), and the sliding push rod 14 has only unidirectional driving force (having only pushing force). Therefore, by arranging two driving sources on one electric push rod 1 and combining the two driving sources with the reset elastic piece 5, the rigid lifting and folding action of the seat surface, the rigid tilting action of the backrest, the rigid unfolding action of the leg support and the elastic folding action of the leg support are realized, and the problem that the anti-pinch function cannot be met when a single electric push rod is applied to the functional sofa is solved; when satisfying anti-pinch effect, can also reduce spare part quantity and reduction in production cost.

Referring to fig. 2, in the present embodiment, two leg stretching assemblies 4 are provided, and the two leg stretching assemblies 4 are oppositely connected to the lifting mechanism 3. Specifically, the lifting mechanism 3 includes two driving linkage groups 31 hinged to the base 2 and two supporting plates 32 hinged to the upper ends of the driving linkage groups 31, and the two leg stretching assemblies 4 are respectively hinged to the front ends of the different supporting plates 32 to keep the state of the leg supports relative to the sofa seat surface from being affected by the lifting mechanism 3.

Referring to fig. 2 and 4, in the present embodiment, a first cross bar 41 is connected between the two leg stretching assemblies 4, and preferably, the first cross bar 41 is connected to the rear ends of the leg stretching assemblies 4; a second cross bar 33 is connected between the two supporting plates 32, the sliding push rod 14 is connected to the first cross bar 41, and the driving block 13 is connected to the second cross bar 33.

Referring to fig. 1 to 5, preferably, the sliding push rod 14 is hinged to the first cross rod 41, the second cross rod 33 is rotatably connected between the two support plates 32, and the second cross rod 33 is connected with the driving block 13 through the connecting rod set 34, wherein the second cross rod 33, the connecting rod set 34 and the driving block 13 together form a crank-slide rod structure; through the crank-slide rod structure, the driving block 13 drives the second cross bar 33 to rotate within a preset rotation angle range. In order to facilitate the control of the rotation angle range of the second cross bar 33, in this embodiment, a limiting rod 331 is disposed on the second cross bar 33, and a limiting block 321 is disposed on the supporting plate 32 and cooperates with the limiting rod 331 to limit the rotation angle of the second cross bar 33.

Through above-mentioned structure, when starting electric putter 1, this sofa rack structure's expansion action can be divided into two sections: (1) the driving block 13 drives the second cross bar 33 to rotate, the lifting mechanism 3 keeps not acting, and the sliding push rod 14 can drive the leg stretching assembly 4 to unfold or fold relative to the lifting mechanism 3; (2) the second cross bar 33 is at a limited position and cannot rotate, the driving block 13 can drive the lifting mechanism 3 to lift or furl relative to the base 2, and the lifting mechanism 3 drives the leg stretching assembly 4 to move together and keep the leg stretching assembly 4 to stop moving relative to the lifting mechanism 3. Through above-mentioned structure in order to realize the sectional type action for the flexible subassembly 4 of shank can expand alone or draw in relatively lifting mechanism 3, increases a plurality of posture states, satisfies user's multiple posture demand, increases the comfort level.

Specifically, the linkage 34 includes a swing link 341 and a transmission rod 342, one end of the swing link 341 is fixedly connected to the second cross bar 33, the other end of the swing link 341 is hinged to one end of the transmission rod 342, and the other end of the transmission rod 342 is hinged to the driving block 13. Therefore, the function of the crank-slide bar structure is realized by combining the second cross bar 33, the swing rod 341, the transmission rod 342 and the driving block 13, the structure is simple, and the corresponding relation between the rotation angle of the second cross bar 33 and the stroke of the driving block 13 can be coordinated by designing different lengths of the swing rod 341.

Referring to fig. 3 and 5, in the embodiment, two ends of the second cross bar 33 are respectively provided with a rotating shaft sleeve 332, the two support plates 32 are respectively provided with a rotating hole 322 rotatably matched with the rotating shaft sleeve 332, and the rotating shaft sleeve 332 is used as a cushion layer to reduce friction between the second cross bar 33 and the support plates 32 during relative rotation, so that the requirement of production precision of the second cross bar 33 is reduced, and the production cost is reduced.

Preferably, one end of the rotating shaft sleeve 332 is provided with a flange portion extending radially outward, the rotating shaft sleeve 332 is inserted into the rotating hole 322 by the outward inward fit of the supporting plate 32, the limiting rod 331 is inserted and fixed on the second cross bar 33, and the flange portion of the rotating shaft sleeve 332 is located between the outer side of the supporting plate 32 and the limiting rod 331, so that the rotating shaft sleeve 332 is limited on the rotating hole 322 of the supporting plate 32 by the limiting rod 331, and the rotating shaft sleeve is simple in structure, convenient to assemble and disassemble, and convenient to produce, maintain and replace.

In this embodiment, the return spring 5 is connected between the lifting mechanism 3 and the leg retraction assembly 4. Specifically, the elastic return element 5 is a spring, and two ends of the spring are respectively connected to the leg stretching assembly 4 and the support plate 32.

Indeed, the elastic return element 5 may also be a torsion spring or an elastic band or a combination of a spring and an elastic band to provide elastic tension.

Referring to fig. 1, 8 to 12, in this embodiment, the driving mechanism includes a screw rod 15 extending outward from the box 11, the driving block 13 is in transmission fit with the screw rod 15, the sliding push rod 14 is in abutting fit with the driving block 13, the driving block 13 reciprocates along the axial direction of the screw rod 15 under the action of the motor 12, and the driving block 13 can only push the sliding push rod 14 to move in a direction away from the box 11. It will be appreciated that the drive mechanism is well known to those skilled in the art and will not be described in detail herein.

Therefore, when the screw rod 15 rotates, the driving block 13 axially moves, the driving block 13 abuts against the sliding push rod 14 to unidirectionally push the sliding push rod 14 to axially move, and when the screw rod 15 rotates in the other direction, the driving block 13 axially retracts, but because the sliding push rod 14 is not directly connected with the driving block 13, the sliding push rod 14 cannot be pulled back by the driving block 13, so that the driving block 13 can bidirectionally linearly move to drive the lifting mechanism 3, and the sliding push rod 14 can only unidirectionally linearly move to drive the leg stretching assembly 4.

Referring to fig. 9 and 12, in this embodiment, the electric putter 1 further includes a fixed guide rod 17, one end of the fixed guide rod 17 is connected to the box 11, the driving block 13 is slidably disposed in the fixed guide rod 17, the sliding putter 14 is disposed in the fixed guide rod 17, and one end of the sliding putter 14 is exposed out of one end of the fixed guide rod 17 away from the motor 12. Therefore, the fixed guide rod 17 is used for guiding the driving block 13, and the radial rotation of the driving block 13 when the screw rod 15 drives the driving block 13 to move can be avoided; on the other hand, the sliding push rod 14 is inserted into the fixed guide rod 17, and the fixed guide rod 17 can also be used for guiding the sliding push rod 14.

Referring to fig. 9 and 10, in the embodiment, the sliding rod 14 includes a rod 141, a slider 142 and a connector 143, the slider 142 and the connector 143 are respectively disposed at two ends of the rod 141, and the slider 142 is used for abutting against a side of the driving block 13 away from the box 11. Wherein the connector 143 is used for connecting the leg stretching assembly 4.

Preferably, any one of the sliding base 142 and the connecting head 143 is screwed on the rod 141; alternatively, the slide 142 and the connector 143 are both screwed to the rod 141. Therefore, the relative distance between the connecting point of the connecting head 143 for connecting the leg stretching assembly 4 and the connecting point of the driving block 13 for connecting the transmission rod 342 can be conveniently adjusted by screwing the sliding seat 142 and/or the connecting head 143 with the rod body 141, so that the electric push rod 1 can be conveniently assembled on the sofa frame structure, the problem that the assembly is difficult due to the machining error of each part of the sofa frame structure is solved, and particularly the corresponding problem of the initial state of the lifting mechanism 3 and the leg stretching assembly 4 is solved.

Referring to fig. 9, a fixing buckle 18 is disposed at an end of the fixing guide rod 17 away from the motor 12, a through hole 181 is disposed on the fixing buckle 18 for passing through the rod 141, and the through hole 181 cooperates with the rod 141 to guide the rod 141.

Referring to fig. 10 to 12, in the present invention, since the end of the sliding push rod 14 is no longer in threaded engagement with the screw rod 15, in order to solve the stability problem when the sliding push rod 14 moves, the following technical solutions are proposed:

(1) the sliding push rod 14 is arranged on the screw rod 15 in a sliding manner along the axial direction of the screw rod 15; specifically, the sliding base 142 and the rod 141 are both hollow tubular structures, and the inner diameter of the sliding base 142 is matched with the outer diameter of the lead screw 15, so that the sliding base 142 can rotate and slidably sleeve the lead screw 15, and the sliding base 142 is guided by the lead screw 15.

(2) The sliding push rod 14 is arranged on the fixed guide rod 17 in a sliding manner along the axial direction of the screw rod 15; specifically, the shape of the outer wall of the sliding seat 142 is adapted to the shape of the cavity of the fixed guide rod 17, preferably, a plurality of guide bars 173 extending along the length direction of the fixed guide rod 17 are disposed in the cavity of the fixed guide rod 17, a sliding groove 1421 in sliding fit with the guide bars 173 is disposed on the outer wall of the sliding seat 142, and the fixed guide rod 17 guides the sliding rod 14 through the cooperation between the guide bars 173 and the sliding groove 1421.

The two solutions can be used separately or in combination, and the guiding function of the fixing buckle 18 on the rod body 141 is combined, so that the two ends of the sliding push rod 14 are kept relatively stable when moving, a better guiding effect is achieved, and the stability of the sliding push rod 14 when moving is enhanced.

Referring to fig. 9 and 11, in the present embodiment, at least two limit switches 172 are disposed in the fixed guide bar 17 at intervals, and the limit switches 172 cooperate with the driving block 13 to control the stroke of the driving block 13. Specifically, the limit switch 172 is positioned and mounted in the cavity of the fixed guide rod 17 through the stroke assembly 171.

With the structure, the working process of the sofa frame structure provided by the utility model is as follows:

(1) deployment of the leg retraction assembly 4: the motor 12 is electrified to rotate positively, the screw rod 15 drives the driving block 13 to move away from the motor 12, meanwhile, the driving block 13 pushes the sliding push rod 14 forwards, in the process, the driving block 13 drives the second cross rod 33 to rotate, the lifting mechanism 3 keeps not acting, and the sliding push rod 14 drives the leg stretching assembly 4 to stretch the leg support;

(2) the lifting mechanism 3 and the leg extension assembly 4 are lifted integrally: when the leg support is unfolded to the limit position, the motor 12 is electrified continuously to rotate forwards, the screw rod 15 continuously drives the driving block 13 to move away from the motor 12, meanwhile, the driving block 13 continuously pushes the sliding push rod 14 forwards, in the process, the second cross rod 33 does not rotate any more, the driving block 13 and the sliding push rod 14 simultaneously drive the lifting mechanism 3 and the leg stretching assembly 4 to lift synchronously, and meanwhile, the backrest assembly 35 tilts backwards.

The anti-pinch principle of the sofa frame structure is as follows:

the motor 12 is electrified and reversely rotated, the screw rod 15 drives the driving block 13 to move close to the motor 12, the reset elastic piece 5 elastically pulls the leg stretching component 4 to fold, the leg stretching component 4 drives the sliding push rod 14 to keep abutting against the driving block 13, in the process, the driving block 13 drives the second cross rod 33 to rotate, and the lifting mechanism 3 keeps not acting; when the hands and feet of a person are clamped accidentally, the generated resistance overcomes the elastic tension of the reset elastic piece 5, the leg stretching assembly 4 stops being folded, and the sliding push rod 14 is separated from the driving block 13, so that the injury is prevented from continuing, and serious clamping injury is avoided.

Example 2

Referring to fig. 13 and 14, the difference between the present embodiment and embodiment 1 is only the difference in the transmission relationship between the slide push rod 14 and the driving block 13 and the driving mechanism. The method comprises the following specific steps:

the driving mechanism comprises a screw rod 15 extending out of the box body 11, a driving block 13 is in transmission fit with the screw rod 15, a screw rod nut 16 is arranged on the screw rod 15 in a matching manner, one end, close to the box body 11, of a sliding push rod 14 is sleeved on the screw rod nut 16 in a sliding manner along the axis direction of the screw rod 15, the driving block 13 and the screw rod nut 16 respectively move back and forth along the axis direction of the screw rod 15 under the action of the motor 12, and the screw rod nut 16 only can push the sliding push rod 14 to move towards the direction away from the box body 11.

The principle of the bidirectional linear motion of the driving block 13 and the principle of the unidirectional linear motion of the sliding push rod 14 can be referred to the related description of embodiment 1; in the scheme, the screw nut 16 drives the sliding push rod 14 to perform one-way linear movement, so that the sliding push rod 14 is not associated with the driving block 13, and the assembly distance between the screw nut 16 and the driving block 13 on the screw rod 15 can be adjusted, so that the relative distance between the connecting point of the connector 143 for connecting the leg stretching assembly 4 and the connecting point of the driving block 13 for connecting the transmission rod 342 can be adjusted, and the electric push rod 1 can be assembled on a sofa frame structure, thereby solving the problem of difficulty in assembly caused by the processing error of each part of the sofa frame structure, and particularly solving the problem of correspondence between the lifting mechanism 3 and the initial state of the leg stretching assembly 4.

Preferably, referring to the sliding fit relationship between the sliding seat 142 and the fixed guide 17 shown in embodiment 1, the outer wall of the lead screw nut 16 of this embodiment is shaped to fit the cavity of the fixed guide 17, and the outer wall of the lead screw nut 16 is also provided with a sliding groove 1421 slidably fitted with the guide bar 173, so that the fixed guide 17 guides the lead screw nut 16 by the fit between the guide bar 173 and the sliding groove 1421.

In summary, the sofa frame structure provided by the utility model has the advantages that the two driving sources are arranged on the electric push rod 1, and the two driving sources are combined with the reset elastic piece 5 to realize rigid lifting and folding actions of the seat surface, rigid tilting actions of the backrest, rigid unfolding actions of the leg support and elastic folding actions of the leg support, so that the problem that the function of preventing the sofa from being clamped cannot be met when a single electric push rod is applied to the functional sofa is solved; when satisfying anti-pinch effect, can also reduce spare part quantity and reduction in production cost.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (10)

1. A sofa frame structure, comprising: a base, a lifting mechanism hinged on the base, a leg stretching component hinged on the lifting mechanism, an electric push rod and a reset elastic component, wherein,

the electric push rod comprises a box body, a motor and a driving mechanism, wherein the motor and the driving mechanism are both arranged in the box body, the motor is in transmission fit with the driving mechanism, and a driving block and a sliding push rod are arranged on the driving mechanism;

the box body is connected with the base, the driving block is connected with the lifting mechanism, the sliding push rod is connected with the leg stretching assembly, the driving block can drive the lifting mechanism to lift or furl relative to the base under the action of the motor, and the sliding push rod can only drive the leg stretching assembly to unfold relative to the lifting mechanism;

the leg stretching assembly is elastically driven by the reset elastic piece to be folded and reset.

2. The sofa frame structure of claim 1, wherein: the driving mechanism comprises a lead screw extending out of the box body, a driving block is in transmission fit with the lead screw, a sliding push rod is in butt fit with the driving block, the driving block moves back and forth along the axis direction of the lead screw under the action of the motor, and the driving block can only drive the sliding push rod to move towards the direction far away from the box body.

3. The sofa frame structure of claim 1, wherein: actuating mechanism includes to the lead screw that the box extends outward, the drive block cooperates with the lead screw transmission, the cooperation is provided with screw-nut on the lead screw, slide rod is close to the one end of box can be followed the axis direction slip ground cover of lead screw is located on the screw-nut under the effect of motor, the drive block is followed respectively with screw-nut the axis direction reciprocating motion of lead screw, screw-nut only can drive slide rod is towards keeping away from the direction of box removes.

4. The sofa frame structure according to claim 1, wherein the lifting mechanism comprises two driving linkage sets oppositely hinged to the base and two supporting plates respectively hinged to the upper ends of the different driving linkage sets, and the two leg stretching assemblies are respectively hinged to the front ends of the different supporting plates; the leg stretching assembly is connected with the first cross rod, the supporting plates are connected with the second cross rod, the sliding push rod is connected with the first cross rod, and the driving block is connected with the second cross rod.

5. The sofa frame structure according to claim 4, wherein the sliding rod is hinged to a first cross rod, the second cross rod is rotatably connected between the two support plates, the second cross rod is connected with the driving block through a connecting rod group, and the second cross rod, the connecting rod group and the driving block together form a crank-slide rod structure; through the crank slide bar structure, the driving block drives the second cross bar to rotate within a preset rotation angle range.

6. The sofa frame structure according to claim 5, wherein the linkage comprises a swing link and a transmission rod, one end of the swing link is fixedly connected to the second cross rod, the other end of the swing link is hinged to one end of the transmission rod, and the other end of the transmission rod is hinged to the driving block.

7. The sofa frame structure according to claim 5, wherein the second cross bar is provided with a limiting rod, and the support plate is provided with a limiting block cooperating with the limiting rod to limit the rotation angle of the second cross bar.

8. The sofa frame structure according to claim 4, wherein the second cross bar is provided with a rotating shaft sleeve at each end, and the two support plates are provided with a rotating hole rotatably engaged with the rotating shaft sleeves.

9. The sofa frame structure of claim 1, wherein the return spring is connected between the lifting mechanism and the leg telescoping assembly.

10. A sofa comprising a sofa frame structure according to any one of claims 1 to 9.

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