Telescopic seat frame with front and back limiting function and seat

Abstract

The utility model discloses a telescopic seat frame with a front-back limit and a seat, the telescopic seat frame with the front-back limit comprises a base, a telescopic adjusting assembly is assembled on the base, and the telescopic adjusting assembly can reciprocate between the front end and the rear end of the base; the limiting mechanism comprises two limiting assemblies, and the two limiting assemblies are assembled at the front end and the rear end of the base correspondingly; the triggering piece is fixedly connected to the telescopic adjusting assembly and can move along with the telescopic adjusting assembly; when the telescopic seat frame is in a stretching state, the triggering piece is limited in a first limiting assembly at the front end of the base; and when the telescopic seat frame is in the storage state, the triggering piece is limited in the second limiting assembly at the rear end of the base. According to the telescopic seat frame, the limiting assemblies are assembled at the front end and the rear end of the base to limit the telescopic adjusting assembly, the telescopic seat frame can be reliably limited to be in the stretching state or the containing state, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, in particular to a telescopic seat frame and a seat with front and rear limit functions. Background Art

[0002] At present, functional seats can generally meet the user's sitting and lying postures by switching states, and the state switching of the seat depends on the telescopic deformation of the seat frame. In order to ensure smooth telescopic deformation, the friction between the various components inside the seat frame is generally low, especially for seats that switch states manually. This also makes it easy for the components inside the seat frame to move unexpectedly during normal use, that is, the seat frame may automatically switch states during normal use, causing the seat frame to be unable to reliably maintain a certain state, giving users a poor user experience and posing potential safety risks. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art described above, the utility model provides a telescopic seat frame with front and rear limiters, which can reliably limit the telescopic seat frame to an extended state or a stored state.

[0004] According to an embodiment of the utility model, a telescopic seat frame with front and rear limits includes: a base, on which is mounted a telescopic adjustment component, the telescopic adjustment component being able to reciprocate between the front end and the rear end of the base to switch the telescopic seat frame between an extended state and a retracted state; a limit mechanism, including two limit components, the two limit components being respectively mounted on the front end and the rear end of the base; a trigger member, the trigger member being fixedly connected to the telescopic adjustment component and being able to move with the telescopic adjustment component; when the telescopic seat frame is in an extended state, the trigger member is limited to the limit component at the front end of the base; when the telescopic seat frame is in a retracted state, the trigger member is limited to the limit component at the rear end of the base.

[0005] In the telescopic seat frame with front and rear limits, the limit components are installed at the front and rear ends of the base, so that the telescopic adjustment component is limited at the front or rear end of the base, thereby reliably limiting the telescopic seat frame to an extended state or a stored state, avoiding accidental displacement of the telescopic adjustment component during use, and improving the user experience and the safety of the seat.

[0006] According to some embodiments of the utility model, the limiting assembly includes a limiting plate assembled on the base, the limiting plate is provided with a limiting transverse groove, and the limiting transverse groove is cooperatively connected with the trigger member.

[0007] According to some embodiments of the utility model, a rotating pin is hinged on the limit plate, and a guide bevel is provided at one end of the rotating pin close to the opening of the limit transverse groove, and the projection of the guide bevel on the limit plate partially overlaps with the limit transverse groove, and a limiting groove is provided at one end of the rotating pin away from the opening of the limit transverse groove, and the limiting groove and the limiting transverse groove form a limiting cavity capable of locking the trigger member; when the telescopic seat frame switches between the extended state and the stored state, the trigger member can only drive the rotating pin to rotate in the direction of opening the limiting cavity through the guide bevel.

[0008] According to some embodiments of the present invention, a switch pulling member is further included, wherein the switch pulling member is connected to the rotating bayonet member and is used to drive the rotating bayonet member to rotate in a direction to open the limiting cavity.

[0009] According to some embodiments of the present invention, a reset elastic member is further included, wherein the reset elastic member is connected between the limiting plate and the rotating latch member, and is used to drive the rotating latch member to rotate in a direction of closing the limiting cavity.

[0010] According to some embodiments of the utility model, a transmission connecting rod group is hinged between the two limiting components.

[0011] According to some embodiments of the present invention, an armrest is further included, wherein the armrest is fixedly connected to the base, and the limiting assembly is assembled on the armrest.

[0012] According to some embodiments of the utility model, the telescopic adjustment assembly includes an extension bracket, a support frame rod, a slide rail and a front seat frame support frame; wherein: the slide rail is fixedly connected to the base and parallel to the telescopic direction, and the front seat frame support frame is movably mounted on the slide rail; the extension bracket is hinged between the base and the rear end of the front seat frame support frame; the rear end of the support frame rod is fixedly connected to the front seat frame support frame, and the front end of the support frame rod is equipped with a pulley set; the trigger member is fixedly connected to the front seat frame support frame.

[0013] According to some embodiments of the utility model, the extension bracket includes a limit link, a backrest fixing rod and an extension plate which are hinged in sequence, the limit link is hinged to the base, the extension plate is hinged to the front seat frame support frame, and the backrest fixing rod is hinged between the limit link and the extension plate.

[0014] Based on the same inventive concept, the utility model also proposes a seat, including the telescopic seat frame with front and rear limit as described above.

[0015] In summary, the telescopic seat frame with front and rear limit provided by the utility model has the following technical effects:

[0016] By assembling the limiting assembly at the front end and the rear end of the base, the telescopic adjustment assembly is limited at the front end or the rear end of the base, so that the telescopic seat frame can be reliably limited to the extended state or the stored state, avoiding accidental displacement of the telescopic adjustment assembly during use, thereby improving the user experience and the safety of the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a telescopic seat frame according to an embodiment of the utility model;

[0018] Figure 2 A side view of a telescopic seat frame according to an embodiment of the utility model;

[0019] Figure 3 This is a schematic structural diagram of a telescopic adjustment assembly according to an embodiment of the utility model;

[0020] Figure 4 It is a left side view of the limiting mechanism of the embodiment of the utility model;

[0021] Figure 5 It is a right side view of the limiting mechanism of the embodiment of the utility model;

[0022] Figure 6 This is a schematic structural diagram of a seat in an extended state according to an embodiment of the utility model;

[0023] Figure 7 It is a schematic structural diagram of the seat in the storage state according to an embodiment of the utility model.

[0024] The meanings of the reference numerals are as follows:

[0025] 1. Base; 11. Telescopic adjustment component; 111. Extension bracket; 1111. Limiting link; 1112. Backrest fixing rod; 1113. Extension plate; 112. Support frame rod; 113. Slide rail; 114. Front seat frame support frame; 115. Pulley block; 2. Limiting mechanism; 21. Limiting component; 211. Limiting plate; 212. Limiting transverse groove; 213. Rotating bayonet member; 214. Guide bevel; 215. Limiting groove; 216. Limiting cavity; 3. Trigger member; 4. Transmission connecting rod group; 5. Armrest. DETAILED DESCRIPTION

[0026] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] See also Figure 1 , Figure 6 and Figure 7 The utility model discloses a telescopic seat frame with front and rear limit, which is applied to a seat. For the convenience of description, in the utility model, the telescopic seat frame with front and rear limit is collectively referred to as a telescopic seat frame. Preferably, the telescopic seat frame can constitute the main frame of the seat. Further, the state switching of the telescopic seat frame corresponds to the state switching of the seat.

[0030] See also Figure 1 and Figure 2 In the utility model, the telescopic seat frame includes a base 1, a limiting mechanism 2 and a trigger member 3. In some embodiments, a telescopic adjustment component 11 is installed on the base 1, and the telescopic adjustment component 11 can reciprocate on the base 1 to switch the telescopic seat frame between an extended state and a retracted state; the limiting mechanism 2 includes two limiting components 21, and the two limiting components 21 are respectively installed at the front end and the rear end of the base 1; the trigger member 3 is fixedly connected to the telescopic adjustment component 11 and can move with the telescopic adjustment component 11; when the telescopic seat frame is in the extended state, the trigger member 3 is limited in the first limiting component 21 at the front end of the base 1; when the telescopic seat frame is in the retracted state, the trigger member 3 is limited in the second limiting component 21 at the rear end of the base 1. Preferably, by assembling the limit assembly 21 at the front and rear ends of the base 1, the telescopic adjustment assembly 11 is limited at the front or rear end of the base 1, so that the telescopic seat frame can be reliably limited to the extended state or the stored state, avoiding accidental displacement of the telescopic adjustment assembly 11 during use, thereby improving the user experience and the safety of the seat.

[0031] See also Figure 2 , Figure 4 and Figure 5 In some embodiments, the limiting assembly 21 includes a limiting plate 211 assembled on the base 1 , the limiting plate 211 is provided with a limiting transverse groove 212 , and the limiting transverse groove 212 is cooperatively connected with the trigger member 3 . Optionally, the trigger member 3 can be a pin, a protrusion, a limiting column or the like, and the limiting transverse groove 212 can be connected with the trigger member 3 to limit the trigger member 3 in the limiting transverse groove 212; preferably, when the telescopic seat frame switches from the extended state to the stored state, the trigger member 3 follows the telescopic adjustment component 11 to move toward the rear end of the base 1, and when the telescopic seat frame switches from the stored state to the extended state, the trigger member 3 follows the telescopic adjustment component 11 to move toward the front end of the base 1; preferably, when the telescopic seat frame is in the stored state, the trigger member 3 is limited in the limiting transverse groove 212 at the rear end of the base 1, and when the telescopic seat frame is in the extended state, the trigger member 3 is limited in the limiting transverse groove 212 at the front end of the base 1, thereby limiting the corresponding position of the telescopic adjustment component 11, avoiding accidental displacement of the telescopic adjustment component 11 during use, and improving the user experience and the safety of the seat.

[0032] Furthermore, the opening of the limiting transverse groove 212 at the front end of the base 1 and the opening of the limiting transverse groove 212 at the rear end of the base 1 are arranged opposite to each other, so that the trigger member 3 can directly enter the limiting transverse groove 212 at the front end or rear end of the base 1 when following the telescopic adjustment component 11 to perform reciprocating motion on the base 1, thereby limiting the telescopic adjustment component 11 to the extreme position of switching the storage state or the extreme position corresponding to the extended state, thereby avoiding the problem of excessive pulling of the telescopic adjustment component 11 to move when the user manually switches the state of the telescopic seat frame, thereby damaging the base 1 or the telescopic adjustment component 11.

[0033] See also Figure 2 , Figure 4 and Figure 5In some embodiments, a rotating pin 213 is hinged on the limit plate 211, and a guide bevel 214 is provided at one end of the rotating pin 213 close to the opening of the limit transverse groove 212. The projection of the guide bevel 214 on the limit plate 211 partially overlaps with the limit transverse groove 212. A limiting groove 215 is provided at one end of the rotating pin 213 away from the opening of the limit transverse groove 212. The limiting groove 215 and the limiting transverse groove 212 form a limiting cavity 216 capable of locking the trigger member 3; when the telescopic seat frame switches between the extended state and the retracted state, the trigger member 3 can only drive the rotating pin 213 to rotate in the direction of opening the limiting cavity 216 through the guide bevel 214. Optionally, the rotating pin member 213 is hinged on one side surface of the limiting plate 211, that is, when the trigger member 3 abuts against the guide structure and drives the rotating pin member 213 to rotate in the direction of opening the limiting cavity 216, the rotating pin member 213 can rotate sufficiently large without being affected by the size of the limiting transverse groove 212, so that the trigger member 3 can smoothly enter the limiting transverse groove 212. Preferably, when the telescopic seat frame switches between the extended state and the stored state, since the projection of the guide bevel 214 on the limit plate 211 partially overlaps with the limit transverse groove 212, the trigger member 3 can abut against the guide bevel 214 during the process of entering the limit transverse groove 212. Optionally, the portion where the guide bevel 214 overlaps with the limit transverse groove 212 is inclined upward or downward along the direction of the opening of the limit transverse groove 212. The trigger member 3 drives the rotating bayonet member 213 to rotate in the direction of opening the limit cavity 216 through the guide structure, so that the trigger member 3 can enter the limit cavity 216. After the trigger member 3 enters the limit cavity 216, the trigger member 3 no longer abuts against the guide structure, and the rotating bayonet member 213 is under the force of gravity. , at this time, since a limiting groove 215 is provided at one end of the rotating bayonet member 213 away from the opening of the limiting transverse groove 212, optionally, the limiting groove 215 is an arc-shaped groove, so that the trigger member 3 cannot drive the rotating bayonet member 213 to rotate in the direction of opening the limiting cavity 216 through the limiting groove 215, so the trigger member 3 is locked in the limiting cavity 216, that is, the telescopic adjustment component 11 is limited to the front end or the rear end of the base 1. At this time, the telescopic adjustment component 11 cannot automatically move toward the front end or the rear end of the base 1, so as to reliably limit the telescopic seat frame to the extended state or the stored state, effectively preventing the telescopic adjustment component 11 from being accidentally displaced under the action of external forces, thereby improving the user experience and the safety of the seat.

[0034] In some embodiments, a switch traction member is further included, and the switch traction member is connected to the rotating bayonet member 213, and is used to drive the rotating bayonet member 213 to rotate in the direction of opening the limiting cavity 216. Optionally, the switch traction member can be a cable, one end of which is fixedly connected to the rotating bayonet member 213, and the other end of which is connected to a buckle, and the user can pull the cable through the buckle to make the cable pull the rotating bayonet member 213 to rotate in the direction of opening the limiting cavity 216. Preferably, when the trigger member 3 is locked in the limiting cavity 216, the user can pull the rotating bayonet member 213 through the switch traction member to rotate in the direction of opening the limiting cavity 216, so that the limiting cavity 216 is in an open state, and at this time, the user can drive the telescopic adjustment component 11 to move again, and drive the telescopic seat frame to switch between the extended state and the stored state.

[0035] In some embodiments, a reset elastic member is further included, and the reset elastic member is connected between the limit plate 211 and the rotating bayonet member 213, and is used to drive the rotating bayonet member 213 to rotate in the direction of closing the limit cavity 216. Optionally, the reset elastic member is a coil spring or a torsion spring, one end of the reset elastic member is connected to the limit plate 211, and the other end of the reset elastic member is connected to the rotating bayonet member 213. When the trigger member 3 abuts against the guide bevel 214 and drives the rotating bayonet member 213 to rotate in the direction of opening the limit cavity 216, the reset elastic member undergoes elastic deformation. When the trigger member 3 enters the limit cavity 216, the trigger member 3 no longer abuts against the guide structure, and the rotating bayonet member 213 is reset in time under the action of gravity and the elastic force of the reset elastic member, so that the trigger member 3 is locked in the limit cavity 216.

[0036] Furthermore, the rotating pin member 213 is equipped with a positioning pin. When the rotating pin member 213 rotates counterclockwise to the original position (i.e., resets) under the action of gravity and / or the elastic force of the reset elastic member, the positioning pin abuts against the limit plate 211, thereby preventing the rotating pin member 213 from excessively rotating under the action of gravity and / or the elastic force of the reset elastic member.

[0037] See also Figure 2 , Figure 4 and Figure 5In some embodiments, a transmission link group 4 is hinged between the two limit assemblies 21. Optionally, the transmission link group 4 includes at least one transmission link, that is, the two limit assemblies 21 are linked by the transmission link, so that the two limit assemblies 21 are opened or closed at the same time. Specifically, the transmission link group 4 is hinged between the rotating bayonet member 213 at the front end and the rotating bayonet member 213 at the rear end. When the user pulls any of the switch traction members to pull the rotating bayonet member 213 connected to the switch traction member to rotate in the direction of opening the limit cavity 216, under the linkage of the transmission link group 4, the other rotating bayonet member 213 is synchronously rotated in the direction of opening the limit cavity 216, that is, by connecting one of the switch traction members to any of the rotating bayonet members 213, the rotation of the two rotating bayonet members 213 can be controlled, the operation steps of the rotating bayonet member 213 are simplified, and the user experience is improved.

[0038] See also Figure 1 , Figure 6 and Figure 7 In some embodiments, the armrest 5 is further included, the armrest 5 is fixedly connected to the base 1, and the limit assembly 21 is assembled on the armrest 5. Optionally, the armrest 5 is fixed on both sides of the base 1 in the width direction, so as to provide protection for the user on both sides of the base 1 in the width direction to avoid the accident of falling. Optionally, both limit assemblies 21 can be assembled on the armrest 5 to facilitate user operation and maintenance, such as manually directly rotating the rotating bayonet 213 to open the limit cavity 216. Optionally, at least one limit assembly 21 is assembled on the armrest 5. Since the two limit assemblies 21 are opened or closed at the same time under the linkage of the transmission connecting rod group 4, the user only needs to operate one limit assembly 21 to realize the control of the rotation of the two rotating bayonet 213, which can effectively maintain the beauty of the telescopic seat frame.

[0039] In some embodiments, the limit plate 211 at the front end is assembled on the armrest 5, and the switch traction member is connected to the rotating pin member 213 at the front end, so that the user can control the two limit components 21 to be opened or closed at the same time through the switch traction member at the front end of the base 1. Preferably, the guide bevel 214 of the rotating pin member 213 at the front end overlaps with the limit transverse groove 212 and is arranged to be inclined downward along the direction of the opening of the limit transverse groove 212, and the guide bevel 214 of the rotating pin member 213 at the rear end overlaps with the limit transverse groove 212 along the limit transverse groove The direction of the opening 212 is tilted upward so that a transmission connecting rod is hinged between the rotating pin member 213 at the front end and the rotating pin member 213 at the rear end. When the user pulls the switch traction member, the switch traction member pulls the rotating pin member 213 at the front end to rotate clockwise to open the limiting cavity 216 at the front end. At the same time, the rotating pin member 213 at the front end drives the rotating pin member 213 at the rear end to rotate clockwise through the transmission connecting rod, so that the limiting cavity 216 at the rear end is also opened. Furthermore, the reset elastic member is only assembled in the limiting assembly 21 at the front end.

[0040] When the telescopic seat frame switches from the extended state to the stored state, when the switch traction member is pulled, the switch traction member pulls the rotating bayonet member 213 at the front end to rotate clockwise, opening the limiting cavity 216 at the front end. At this time, the telescopic adjustment component 11 can be pushed to move to the rear end, and the trigger member 3 can follow the telescopic adjustment component 11 to move to the rear end. In the process of entering the limiting transverse groove 212 at the rear end, the trigger member 3 abuts against the upwardly inclined guide bevel 214, and drives the rotating bayonet member 213 at the rear end to rotate clockwise, so that the limiting cavity 216 at the rear end is opened, so that the trigger member 3 can enter the limiting cavity 216. When the rotating bayonet member 213 at the rear end rotates clockwise, the rotating bayonet member 213 at the rear end drives the rotating bayonet member 213 at the front end to rotate clockwise through the transmission connecting rod. The trigger member 3 is rotated clockwise and drives the reset elastic member to undergo elastic deformation. When the trigger member 3 enters the limiting cavity 216, the trigger member 3 is no longer in contact with the guide structure, and the reset elastic member drives the rotating latch member 213 at the front end to rotate counterclockwise and reset. At the same time, the rotating latch member 213 at the front end drives the rotating latch member 213 at the rear end to rotate counterclockwise and reset through the transmission connecting rod, thereby locking the trigger member 3 in the limiting cavity 216, that is, limiting the telescopic adjustment component 11 to the rear end of the base 1. At this time, the telescopic adjustment component 11 cannot automatically move toward the front end of the base 1, thereby limiting the telescopic seat frame to the storage state, effectively preventing the telescopic adjustment component 11 from being accidentally displaced under the action of external forces, and improving the user experience and the safety of the seat.

[0041] When the telescopic seat frame switches from the storage state to the extended state, when the user pulls the switch traction member, the switch traction member pulls the rotating bayonet member 213 at the front end to rotate clockwise, opening the limiting cavity 216 at the front end, and at the same time, the rotating bayonet member 213 at the front end drives the rotating bayonet member 213 at the rear end to rotate clockwise through the transmission connecting rod, so that the limiting cavity 216 at the rear end is also opened. At this time, the telescopic adjustment component 11 can be pushed to move toward the front end, and the trigger member 3 can follow the telescopic adjustment component 11 to move toward the front end. In the process of entering the limiting transverse groove 212 at the front end, the trigger member 3 abuts against the downwardly inclined guide bevel 214, and drives the rotating bayonet member 213 at the front end to rotate clockwise. The needle rotates, so that the limiting cavity 216 at the front end is opened, so that the trigger member 3 can enter the limiting cavity 216. After the trigger member 3 enters the limiting cavity 216, the trigger member 3 and the guide structure are no longer in contact, and the reset elastic member drives the rotating latch member 213 at the front end to rotate counterclockwise and reset, thereby locking the trigger member 3 in the limiting cavity 216, that is, limiting the telescopic adjustment component 11 at the front end of the base 1. At this time, the telescopic adjustment component 11 cannot automatically move to the rear end of the base 1, so that the telescopic seat frame is limited to the extended state, effectively preventing the telescopic adjustment component 11 from being accidentally displaced under the action of external forces, thereby improving the user experience and the safety of the seat.

[0042] See also Figure 1 , Figure 2 and Figure 3In some embodiments, the telescopic adjustment component 11 includes an extension bracket 111, a support frame rod 112, a slide rail 113 and a front seat frame support frame 114; wherein: the slide rail 113 is fixedly connected to the base 1 and parallel to the telescopic direction, and the front seat frame support frame 114 is movably mounted on the slide rail 113; the extension bracket 111 is hinged between the base 1 and the rear end of the front seat frame support frame 114; the rear end of the support frame rod 112 is fixedly connected to the front seat frame support frame 114, and the front end of the support frame rod 112 is equipped with a pulley set 115; the trigger member 3 is fixedly connected to the front seat frame support frame 114. Specifically, the front seat frame support frame 114 is rollingly connected to the slide rail 113 through a pulley or the like, which can greatly reduce the resistance of the front seat frame support frame 114 to reciprocate on the base 1, so that the user can manually push and pull the front seat frame support frame 114, thereby manually driving the telescopic seat frame to switch between the extended state and the retracted state; when the front seat frame support frame 114 reciprocates, the extension bracket 111 is extended or retracted under the traction of the front seat frame support frame 114, wherein the extension bracket 111 in the extended state can drive the telescopic seat frame in the extended state to have a more The longer length, that is, the bed switched by the seat has a longer length, which brings a more comfortable lying experience to the user. Optionally, the support frame rod 112 serves as an extension of the front seat frame support frame 114 in the telescopic direction, which can increase the length of the telescopic seat frame in the extended state. At the same time, the pulley group 115 at the front end of the support frame rod 112 is utilized to enable the support frame rod 112 to smoothly follow the movement of the front seat frame support frame 114, thereby reducing the external resistance encountered by the telescopic seat frame when switching between the extended state and the stowed state, so as to facilitate the user to manually push and pull the telescopic seat frame to switch between the extended state and the stowed state.

[0043] See also Figure 1 , Figure 2 and Figure 3In some embodiments, the extension bracket 111 includes a limit link 1111, a backrest fixing rod 1112 and an extension plate 1113 which are hinged in sequence, the limit link 1111 is hinged to the base 1, the extension plate 1113 is hinged to the front seat frame support frame 114, and the backrest fixing rod 1112 is hinged between the limit link 1111 and the extension plate 1113. Specifically, the front seat frame support frame 114 can drive the backrest fixing rod 1112 more stably through the extension plate 1113, and at the same time, the height of the front seat frame support frame 114 can be lowered through the extension plate 1113, so that the front seat frame support frame 114 with a smaller height is connected to the connection point height of the backrest fixing rod 1112 through the extension plate 1113 to save effort, and can eliminate the risk of the front seat frame support frame 114 being too high and interfering with the extension pad II, and at the same time, can increase the height of the backrest fixing rod 1112 so that the telescopic seat frame in the extended state has a longer length, that is, the bed switched from a seat has a longer length, which brings a more comfortable lying experience to the user, and also means that a longer extension pad II can be installed within an appropriate range without affecting the structural stability of the seat, which is conducive to the telescopic seat frame, that is, the seat in the extended state to obtain a larger seat depth, thereby realizing the functional transformation from seat to bed. Furthermore, the extension plate 1113 can be multiple, and the multiple extension plates 1113 are hinged in sequence; at the same time, when the telescopic seat frame is in the extended state, the extension plate 1113 can cooperate with the backrest fixing rod 1112 to provide longitudinal support force for the extension pad II, thereby effectively ensuring the structural stability of the seat. Furthermore, an L-shaped transmission member is connected between the front seat frame support frame 114 and the extension plate 1113, and the horizontal section of the L-shaped transmission member is fixedly connected to the front seat frame support frame 114, and the vertical section of the L-shaped transmission member is hinged to the extension plate 1113, which can avoid excessive interference between the extension plate 1113 and the seat pad I. The seat pad I can fit more closely to the vertical section of the L-shaped transmission member, which is beneficial to reduce the gap between the seat pad I and the extension pad II on the backrest fixing rod 1112 when in the extended state, thereby effectively improving the comfort of the seat.

[0044] See also Figure 6 and Figure 7In some embodiments, a seat comprises a telescopic seat frame with front and rear limit as described above. Optionally, a seat cushion I is mounted on the front seat frame support frame 114, an extension cushion II is mounted on the backrest fixing rod 1112, and a backrest cushion III is mounted at the rear end of the base 1. Further, the backrest cushion III is mounted at the rear end and is located on the upper side of the seat cushion I and the extension cushion II. The space behind the lower side of the backrest cushion III is defined as a storage area. When the telescopic seat frame is in the storage state, the extension cushion II is in the storage area with at least part of the seat cushion I. When the telescopic seat frame is in the extended state, the extension cushion II and the seat cushion I are separated from the storage area, and the working surface of the extension cushion II is flush with the working surface of the seat cushion I.

[0045] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A telescopic seat frame with front and rear limit, characterized in that: include: A base (1), wherein the base (1) is equipped with a telescopic adjustment component (11), and the telescopic adjustment component (11) is capable of reciprocating between the front end and the rear end of the base (1) so as to switch the telescopic seat frame between an extended state and a retracted state; The limiting mechanism (2) comprises two limiting components (21), wherein the two limiting components (21) are respectively assembled at the front end and the rear end of the base (1); A trigger member (3), the trigger member (3) being fixedly connected to the telescopic adjustment component (11) and being capable of moving along with the telescopic adjustment component (11); When the telescopic seat frame is in an extended state, the trigger member (3) is limited in the limit assembly (21) at the front end of the base (1); when the telescopic seat frame is in a stored state, the trigger member (3) is limited in the limit assembly (21) at the rear end of the base (1).

2. The telescopic seat frame with front and rear limit according to claim 1, characterized in that: The limiting assembly (21) comprises a limiting plate (211) mounted on the base (1); the limiting plate (211) is provided with a limiting transverse groove (212); and the limiting transverse groove (212) is cooperatively connected with the trigger member (3).

3. The telescopic seat frame with front and rear limit according to claim 2, characterized in that: A rotating bayonet (213) is hingedly connected to the limiting plate (211); a guiding bevel (214) is arranged at one end of the rotating bayonet (213) close to the opening of the limiting transverse groove (212); a projection of the guiding bevel (214) on the limiting plate (211) partially overlaps with the limiting transverse groove (212); a limiting groove (215) is arranged at one end of the rotating bayonet (213) away from the opening of the limiting transverse groove (212); the limiting groove (215) and the limiting transverse groove (212) form a limiting cavity (216) capable of locking the trigger member (3); When the telescopic seat frame switches between the extended state and the retracted state, the trigger member (3) can only drive the rotating latch member (213) to rotate in the direction of opening the limiting cavity (216) through the guiding bevel (214).

4. The telescopic seat frame with front and rear limit according to claim 3, characterized in that: It also comprises a switch pulling member, which is connected to the rotating latch member (213) and is used to drive the rotating latch member (213) to rotate in a direction of opening the limiting cavity (216).

5. The telescopic seat frame with front and rear limit according to claim 3, characterized in that: It also comprises a reset elastic member, which is connected between the limiting plate (211) and the rotating latch member (213) and is used to drive the rotating latch member (213) to rotate in a direction of closing the limiting cavity (216).

6. The telescopic seat frame with front and rear limit according to claim 3, characterized in that: A transmission connecting rod assembly (4) is hinged between the two limiting assemblies (21).

7. The telescopic seat frame with front and rear limit according to claim 1, characterized in that: It also comprises an armrest (5), wherein the armrest (5) is fixedly connected to the base (1), and the limiting assembly (21) is assembled on the armrest (5).

8. The telescopic seat frame with front and rear limit according to claim 1, characterized in that: The telescopic adjustment assembly (11) comprises an extension bracket (111), a support frame rod (112), a slide rail (113) and a front seat frame support frame (114); wherein: The slide rail (113) is fixedly connected to the base (1) and is parallel to the telescopic direction, and the front seat frame support frame (114) is movably assembled on the slide rail (113); The extension bracket (111) is hinged between the base (1) and the rear end of the front seat frame support bracket (114); The rear end of the support frame rod (112) is fixedly connected to the front seat frame support frame (114), and the front end of the support frame rod (112) is equipped with a pulley block (115); The trigger member (3) is fixedly connected to the front seat frame support frame (114).

9. The telescopic seat frame with front and rear limit according to claim 8, characterized in that: The extension bracket (111) comprises a limiting link (1111), a backrest fixing rod (1112) and an extension plate (1113) which are hinged in sequence; the limiting link (1111) is hinged to the base (1); the extension plate (1113) is hinged to the front seat frame support frame (114); and the backrest fixing rod (1112) is hinged between the limiting link (1111) and the extension plate (1113).

10. A seat, characterized in that: It comprises a telescopic seat frame with front and rear limit as described in any one of claims 1 to 9.

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