CN219556737U - Adjustable chair - Google Patents

Abstract

The utility model relates to the technical field of folding seats, in particular to an adjustable seat. The adjustable seat includes: the chair back is suitable for being fixed with an external support; one end of the chair seat is rotatably suspended on the chair back through a rotating shaft; a ratchet wheel is arranged in the rotating shaft; the clamping mechanism comprises a groove and a clamping tenon arranged in the groove; the groove is formed by a notch at the edge of the ratchet wheel, and a first bulge and a second bulge extend from the groove wall of the groove; the seat has a flat state in which the second protrusion is self-locked in the latch, and a folded state in which the first protrusion is self-locked in the latch. According to the adjustable seat, the purpose that the adjustable seat can be stably used after being unfolded or folded is achieved through the self-locking clamping mechanism, and the adjustable seat is ensured to be stably supported under riding pressure in a flat state; the self-locking structure is simple and effective, the installation is convenient, the locking is automatic after the clamping, the main structure is mechanical, and the failure rate is low.

Description

Adjustable chair

Technical Field

The utility model relates to the technical field of folding seats, in particular to an adjustable seat.

Background

The adjustable seat is a novel seat with adjustable angle between the seat and the chair back, and has a subway with both passenger and goods application scene, so that the seat is folded to release the space in the carriage when carrying goods; and in cinema or large conference rooms, the seat can be folded during the loose hall, so that people can be evacuated conveniently.

The adjustable seat in the prior art usually utilizes the damping rotating shaft to realize folding and flattening of the seat, but the damping rotating shaft can only realize the change of the included angle between the seat and the chair back, the fixed state can not be kept when the seat is flattened, and the locking state can not be kept when the seat is folded; or the chair seat is folded by the spring, but the spring clamping mechanism is easy to clamp and damage after being folded and opened for many times, the service life is short, and parts of the spring clamping mechanism are easy to clamp hands or scratch arms of operators, so that the safety is required to be considered.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor fixing effect of the adjustable seat in the prior art, thereby providing an adjustable seat with an effective fixing position.

In order to solve the above technical problems, the present utility model provides an adjustable seat, comprising:

the chair back is suitable for being fixed with an external support;

one end of the chair seat is rotatably suspended on the chair back through a rotating shaft; a ratchet wheel is arranged in the rotating shaft;

the clamping mechanism comprises a groove and a clamping tenon arranged in the groove; the groove is formed by the notch at the edge of the ratchet wheel, and a first protrusion and a second protrusion extend from the wall of the groove;

the seat has a flat state in which the second protrusion is self-locked in the latch, and a folded state in which the first protrusion is self-locked in the latch.

Optionally, the method further comprises: the armrest is rotatably suspended on the chair back through an armrest rotating shaft at one end;

the linkage mechanism comprises a driving wheel, a driven wheel, an idler wheel, a driving belt and a limiting block;

the driving wheel is sleeved on the periphery of the ratchet wheel;

the driven wheel is sleeved on the periphery of the armrest rotating shaft;

the idler comprises a toothed idler and a toothless idler;

the driving belt is sleeved on the driving wheel and the driven wheel in a surrounding manner, the toothed idler wheel is fixed on the chair back and meshed with the driving belt to transmit power, and the gearless idler wheel is fixed on the chair back and in contact connection with the driving belt to transmit power and tension the driving belt;

the driving wheel and the driven wheel synchronously rotate;

the limiting block is arranged on the chair back and located below the driven wheel, and the handrail is propped against the limiting block in a flat state to fix the position.

Optionally, the two ends of the latch are symmetrical openings, and the openings are matched with the first protrusions and the second protrusions in shape.

Optionally, the bottom end of the chair back extends towards the direction close to the chair seat and is provided with an extension fixing part, and the extension fixing part is perpendicular to the chair back and suitable for providing support when the chair seat is in a flat state.

Optionally, the method further comprises: the electric heating device is tightly fixed on one side of the chair seat far away from the chair back and is suitable for heating the chair seat.

Optionally, the chair back leans towards the direction of keeping away from the seat support to a certain angle, is suitable for fitting human body structure.

Optionally, the end of the armrest, which is far away from the chair back, is arc-shaped and is suitable for being attached to an arm structure.

The technical scheme of the utility model has the following advantages:

1. according to the adjustable seat, the purpose that the adjustable seat can be stably used after being unfolded or folded is achieved through the clamping mechanism capable of self-locking, the defect that the adjustable seat is easy to loose after being folded in the prior art is overcome, the practicability of the folding seat is improved, the adjustable seat has a wide application prospect, and the adjustable seat can be stably supported under the pressure of an occupant in a flat state; the self-locking structure is simple and effective, the installation is convenient, the self-locking structure is automatically locked after the self-locking structure is clamped, and the self-locking structure can be separated by reverse rotation; and the main structure is mechanical, the failure rate is low, the fixing is stable and is not easy to loose, the maintenance is convenient, the service life is long, and the damage is not easy to damage.

2. According to the adjustable seat, the linkage mechanism for transmitting power to the armrests when the seat is folded is arranged, so that the purpose of synchronously folding the armrests and the seat is achieved, the problem of complicated operation and inconvenience in the use process of the folding seat is solved, the folding structure is optimized, the use is convenient, the practicability is strong, the structure is stable, the working space is small, the folding speed is improved, and the adjustable seat has a wide application prospect.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an adjustable seat according to the present utility model in a flat state;

FIG. 2 is a schematic view of an adjustable seat according to the present utility model in an intermediate position;

FIG. 3 is a schematic view of the folding state of the adjustable seat according to the present utility model.

Reference numerals illustrate:

1. a chair back; 2. a seat; 21. an extension fixing portion; 3. a rotating shaft; 31. a ratchet wheel; 4. a clamping mechanism; 41. a groove; 42. a clamping tenon; 43. a first protrusion; 44. a second protrusion; 45. a third protrusion; 5. an armrest; 51. a handrail rotating shaft; 6. a heating device; 8. a linkage mechanism; 81. a driving wheel; 82. driven wheel; 83. an idler; 831. a toothed idler; 832. a gearless idler; 84. a transmission belt; 85. and a limiting block.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

Referring to fig. 1 to 3, an adjustable seat according to the present embodiment includes:

a chair back 1 adapted to be fixed with an external support;

a seat 2, one end of which is rotatably suspended on the chair back 1 via a rotating shaft 3; a ratchet wheel 31 is arranged in the rotating shaft 3;

the clamping mechanism 4 comprises a groove 41 and a clamping tenon 42 arranged in the groove of the groove 41; the groove 41 is formed by a notch at the edge of the ratchet wheel 31, and a first protrusion 43 and a second protrusion 44 extend from the wall of the groove 41;

the seat 2 has a flat condition in which the second projection 44 is self-locking within the latch 42, and a folded condition in which the first projection 43 is self-locking within the latch 42.

The third protrusion 45 extends from the wall of the other side of the groove 41.

In a specific use process, the groove 41 can synchronously rotate along with the rotating shaft 3, the clamping tenon 42 is positioned in the opening of the groove 41, and the clamping tenon 42 can rotate in the gap of the groove 41; the inner wall of the groove 41 extends away from the ratchet wheel 31 in the radial direction and is provided with the first protrusion 43 and the second protrusion 44; the first protrusions 43 and the second protrusions 44 are sequentially spaced clockwise around the ratchet wheel 31, and the adjustable seat has three states, a flat state, an intermediate state and a folded state.

When the adjustable seat is in a flat state, an included angle between the seat base 2 and a plane where the seat back 1 is positioned is approximately 90 degrees, and the adjustable seat bears a seat function; the second protrusion 44 is clamped in the latch 42 and is connected together in a concave-convex combination manner, the second protrusion 44 has a tendency to rotate anticlockwise due to the gravity of the seat 2, friction force generated between the second protrusion 44 and the joint surface of the latch 42 counteracts the gravity, the greater the gravity is, the greater the friction force is, the second protrusion 44 is self-locked on the latch 42, the rotating shaft 3 cannot rotate anticlockwise, the seat 2 is fixed in a flat state, and the locking mechanism 4 can still be kept fixed due to self-locking effect when an occupant sits on the seat 2.

When the adjustable seat is in the middle state, the seat 2 is in the process of turning over from the flat state to the folded state; the seat 2 is turned over towards the direction close to the seat back 1, the rotating shaft 3 rotates clockwise, the second protrusion 44 retreats to be separated from the opening on one side of the latch 42, and the third protrusion 45 toggles the opening on the other side of the latch 42, so that the latch 42 rotates clockwise to a preset position corresponding to the first protrusion 43.

The adjustable seat 11 is about to enter a folding state, the seat 2 falls back, the first bulge 43 is clamped into the clamping tenon 42, the first bulge 43 has a tendency to rotate anticlockwise due to the gravity of the seat 2, friction force generated between the first bulge 43 and the joint surface of the clamping tenon 42 counteracts the gravity, the larger the gravity is, the larger the friction force is, the first bulge 43 is self-locked on the clamping tenon 42, the rotating shaft 3 cannot rotate anticlockwise, and the seat 2 is fixed in the folding state.

When the adjustable seat 11 is adjusted from the folded state to the flat state, the seat 2 rotates clockwise, the first protrusion 43 is separated from the latch 42, and the third protrusion 45 toggles the latch 42 to rotate clockwise; subsequently, the seat 2 rotates anticlockwise, and the first protrusion 43 toggles the latch 42 to rotate clockwise to a preset position corresponding to the second protrusion 44.

The adjustable seat provided by the embodiment can realize the purpose of stable use after being unfolded or folded by arranging the self-locking clamping mechanism 4, overcomes the defects that the adjustable seat is easy to loose after being folded and can not be kept fixed after being unfolded in the prior art, improves the practicability of the folding seat, has wide application prospect, and can ensure that the adjustable seat can still be stably supported under the pressure of an occupant in a flat state; the self-locking structure is simple and effective, the installation is convenient, the self-locking structure is automatically locked after the self-locking structure is clamped, and the self-locking structure can be separated by reverse rotation; and the main structure is mechanical, the failure rate is low, the fixing is stable and is not easy to loose, the maintenance is convenient, the service life is long, and the damage is not easy to damage.

Specifically, the method further comprises the following steps: an armrest 5, wherein one end of the armrest 5 is rotatably suspended on the chair back 1 via an armrest rotating shaft 51;

the linkage mechanism 8 comprises a driving wheel 81, a driven wheel 82, an idler wheel 83, a driving belt 84 and a limiting block 85;

the driving wheel 81 is sleeved on the periphery of the ratchet wheel 31;

the driven wheel 82 is sleeved on the periphery of the armrest rotating shaft 51;

the idler 83 includes a toothed idler 831 and a toothless idler 832;

the driving belt 84 is sleeved on the driving wheel 81 and the driven wheel 82 in a surrounding manner, the toothed idler 831 is fixed on the chair back 1 and meshed with the driving belt 84 to transmit power, and the toothless idler 832 is fixed on the chair back 1 and connected with the driving belt 84 in a contact manner to transmit power and tension the driving belt 84;

the driving wheel 81 and the driven wheel 82 rotate synchronously;

the limiting block 85 is arranged on the chair back 1 and below the driven wheel 82, and the armrest 5 is abutted against the limiting block 85 in a flat state to fix the position.

In a specific use process, when the seat 2 is turned over, the driving wheel 81 rotates clockwise synchronously with the rotating shaft 3, the idle wheel 83 transmits power and drives the driven wheel 82 to rotate clockwise through the driving belt 84, and the armrest rotating shaft 51 rotates synchronously with the driven wheel 82, so that the armrest 5 turns over in a direction approaching to the seat back 1; after the seat 2 is fixed in the folded state, the rotation of the rotating shaft 3 is stopped due to the self-locking effect, the driving wheel 81 is stopped to rotate accordingly, the driving belt 84 is locked among the teeth of the driving wheel 81, the driven wheel 82 and the idle wheel 83, the driven wheel 82 is stopped to rotate and is locked on the driving belt 84, and the handrail 5 is fixed in the folded state.

When the seat 2 is unfolded, the driving wheel 81 rotates anticlockwise along with the rotating shaft 3, the driven wheel 82 is driven to rotate anticlockwise through the driving belt 84, the armrest rotating shaft 51 rotates synchronously along with the driving wheel, and the armrest 5 is unfolded until being abutted against the limiting block 85 to be fixed.

The adjustable seat provided by the embodiment realizes the aim of synchronously folding the armrests 5 and the seat 2 by arranging the linkage mechanism 8 for transmitting power to the armrests 5 when the seat 2 is folded, solves the problem of inconvenient operation in the use process of the folding seat, optimizes the folding structure, has convenient use, strong practicability, stable structure, small working space and wide application prospect, and improves folding speed.

Specifically, the two ends of the latch 42 are symmetrical openings, and the openings are matched with the first protrusion 43 and the second protrusion 44 in shape.

In a specific use process, the first protrusion 43 or the second protrusion 44 is locked in one of the openings at two ends of the latch 42, and the inner side surface of the opening is tightly attached to the first protrusion 43 and the second protrusion 44 so as to generate self-locking friction force; the ends of the first protrusion 43 and the second protrusion 44 are pointed protrusions, and the opening shape can be engaged with the pointed protrusions, so that the pointed protrusions can be rotationally clamped into the opening along with the ratchet wheel 31 and can be unscrewed and separated along with the ratchet wheel 31.

Specifically, the bottom end of the backrest 1 extends toward the direction approaching the seat 2, and the extension fixing portion 21 is perpendicular to the backrest 1, so that the backrest 2 is suitable for supporting in a flat state.

In a specific use process, the end face of one side of the unfolded seat 2 abuts against the extending fixing portion 21, so that the seat 2 is prevented from collapsing due to failure of the self-locking structure when a passenger takes the seat, and the stability and the firmness of the riding safety and the supporting and fixing structure are improved.

Specifically, the method further comprises the following steps: the electric heating device 6 is tightly fixed on one side of the chair seat 2 away from the chair back 1 and is suitable for heating the chair seat 2.

In a specific use process, in cold weather, the electric heating device 6 starts to heat the seat 2, and heat is transferred to an occupant through heat transfer, so that riding discomfort caused by the fact that the seat 2 is too cool after the seat is parked for a long time in winter is improved.

Specifically, the backrest 1 is inclined at a certain angle in a direction away from the seat 2, and is suitable for fitting human body structures.

In a specific use process, the chair back 1 is inclined backwards by a certain angle, which can be 5 degrees; the human body can rest and relax when leaning backwards, so that the passengers can lean backwards, the comfort level of the seat is improved, the fatigue caused by sitting for a long time is reduced, and the practicability is enhanced.

Specifically, the end of the armrest 5 away from the chair back 1 is arc-shaped, and is suitable for fitting with an arm structure.

In the specific use, the arc end is the position that the person's wrist and hand were placed, and the arc design prevents to hit the wound to improve riding comfort.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims (7)

1. An adjustable seat, comprising:

a chair back (1) adapted to be fixed with an external support;

a seat (2), one end of which is rotatably suspended on the chair back (1) through a rotating shaft (3); a ratchet wheel (31) is arranged in the rotating shaft (3);

the clamping mechanism (4) comprises a groove (41) and a clamping tenon (42) arranged in the groove of the groove (41); the groove (41) is formed by a notch at the edge of the ratchet wheel (31), and a first protrusion (43) and a second protrusion (44) extend from the wall of the groove (41);

the seat (2) has a flat state in which the second projection (44) is self-locked in the latch (42), and a folded state in which the first projection (43) is self-locked in the latch (42).

2. The adjustable seat according to claim 1, further comprising: an armrest (5), wherein one end of the armrest (5) is rotatably suspended on the chair back (1) through an armrest rotating shaft (51);

the linkage mechanism (8) comprises a driving wheel (81), a driven wheel (82), an idler wheel (83), a transmission belt (84) and a limiting block (85);

the driving wheel (81) is sleeved on the periphery of the ratchet wheel (31);

the driven wheel (82) is sleeved on the periphery of the armrest rotating shaft (51);

the idler (83) comprises a toothed idler (831) and a toothless idler (832);

the transmission belt (84) is sleeved on the driving wheel (81) and the driven wheel (82) in a surrounding mode, the toothed idler wheel (831) is fixed on the chair back (1) and meshed with the transmission belt (84) to transmit power, and the toothless idler wheel (832) is fixed on the chair back (1) and is in contact connection with the transmission belt (84) to transmit power and tension the transmission belt (84);

the driving wheel (81) and the driven wheel (82) synchronously rotate;

the limiting block (85) is arranged on the chair back (1) and located below the driven wheel (82), and the handrail (5) is propped against the limiting block (85) in a flat state to fix the position.

3. The adjustable seat according to claim 1, wherein the latch (42) is symmetrical at both ends, the opening matching the shape of the first protrusion (43) and the second protrusion (44).

4. Adjustable seat according to claim 1, characterized in that the bottom end of the seat back (1) extends towards the direction approaching the seat base (2) with an extension fixation (21), which extension fixation (21) is perpendicular to the seat back (1), adapted to provide support when the seat base (2) is in a flat state.

5. The adjustable seat according to claim 1, further comprising: the electric heating device (6) is tightly attached to one side, far away from the chair back (1), of the chair seat (2) and is suitable for heating the chair seat (2).

6. Adjustable seat according to claim 1, characterized in that the back (1) is tilted at an angle away from the seat (2) and adapted to fit the anatomy.

7. An adjustable seat according to claim 2, wherein the end of the armrest (5) remote from the seat back (1) is arcuate, adapted to fit an arm configuration.