Back-leaning force adjusting mechanism of child chair

Abstract

The utility model discloses a child chair back force adjusting mechanism which comprises a base, a sliding piece, an elastic piece, an adjusting piece and an operating piece, the base is provided with a containing groove, the sliding piece slides in the groove, and the front end of the sliding piece is exposed out of the base and connected with a chair back; the rear end of the operating piece is exposed out of the base and can rotate; the adjusting piece sleeves the operating piece, is circumferentially limited with the base and is in threaded connection with the base; the elastic piece is located between the adjusting piece and the sliding piece and provides forward elastic force. The operating part is rotated to drive the adjusting part to move back and forth, so that the elastic part is compressed or extended, and the elastic force applied to the sliding part is adjusted. The mechanism is simple in structure, and the part cost is reduced; a single elastic piece is used for accurately adjusting the back-chasing force, and the stability is good; the operation piece is exposed to facilitate manual adjustment, a user can rapidly adjust the operation piece according to needs, the use experience is improved, and the requirements of different growth stages of children are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of children's chair, especially a back force adjusting mechanism of children's chair. BACKGROUND

[0002] In the field of children's furniture, the design and manufacture of children's chairs have always been a concern, especially the back force adjusting function of the chair back, which is of great significance to ensure the comfort and healthy growth of children's sitting posture.

[0003] Traditional back force adjusting mechanisms of children's chairs have many shortcomings. In terms of structure, some mechanisms are complex in design and have many parts, which not only increases the difficulty and cost of production and manufacturing, but also makes the product failure rate relatively high, and the maintenance and repair in the later stage are also more difficult. Too many parts may also have certain safety hazards, such as loosening and falling off, which pose a threat to the safety of children.

[0004] In terms of back force adjustment, some traditional mechanisms use multiple elastic components in combination to achieve the adjustment function. However, the coordinated work between multiple elastic components often fails to achieve the desired effect, and may result in inaccurate and unstable adjustment. During use, the back force may suddenly change or fail to be accurately adjusted to the appropriate force, which cannot meet the needs of children at different growth stages and in different use scenarios.

[0005] Convenient operation is also a major shortcoming of traditional back force adjusting mechanisms of children's chairs. The operation of some mechanisms is complex and requires the use of additional tools or complicated steps to complete the adjustment, which is not user-friendly for children or parents, reducing the product's usage frequency and user experience. SUMMARY

[0006] To solve the above technical problems, the utility model provides a back force adjusting mechanism of children's chair, which includes a base, a sliding part, an elastic part, an adjusting part and an operating part. The base has a receiving groove, the sliding part slides in the groove, the front end of the sliding part is exposed to the base and connected to the chair back, the rear end of the operating part is exposed to the base and can rotate, the adjusting part is sleeved on the operating part and limited in the circumferential direction of the base, and the adjusting part and the base are screw-connected, the elastic part is located between the adjusting part and the sliding part, and provides forward elastic force. Rotating the operating part drives the adjusting part to move forward and backward, which can compress or elongate the elastic part, and then adjust the size of the elastic force applied to the sliding part. This mechanism is simple in structure and reduces the cost of parts. A single elastic part is used to accurately adjust the back force, which is stable. The operating part is exposed for manual adjustment, which allows users to quickly adjust as needed, improves the user experience, and meets the needs of children at different growth stages.

[0007] The technical solution of the utility model is as follows:

[0008] The back force adjusting mechanism of the child chair comprises a base, a sliding piece, an elastic piece, an adjusting piece and an operating piece. The base is provided with a receiving groove, the sliding piece is slidingly arranged in the receiving groove, the front end of the sliding piece is exposed from the base and is configured to be connected with the chair back, the operating piece is rotationally arranged at the rear end of the base, the rear end of the operating piece is exposed from the base, the adjusting piece is peripherally limitedly arranged in the receiving groove and is sleeved on the operating piece, the adjusting piece is threadedly connected with the operating piece, the elastic piece is arranged between the adjusting piece and the sliding piece and always gives the sliding piece a forward elastic force, when the operating piece is rotated and drives the adjusting piece to move forward in the receiving groove through the thread, the adjusting piece compresses the elastic piece to increase the elastic force given by the elastic piece to the sliding piece, and when the operating piece is rotated and drives the adjusting piece to move backward in the receiving groove through the thread, the elastic piece is elongated to weaken the elastic force given by the elastic piece to the sliding piece.

[0009] From the structural aspect, the overall structural design is simple, which reduces the use cost of parts; in the aspect of back force adjustment, only one elastic piece is needed to realize the accurate adjustment of the back force, which avoids the complex use of too many elastic pieces and increases the stability of the adjustment; the rear end of the operating piece is exposed from the base, which is convenient for the user to directly rotate and operate with hands, so that the user can adjust the back force at any time and quickly according to the actual demand, and the use experience is improved.

[0010] As a preferred, the base comprises an end cover, the end cover is arranged at the rear of the receiving groove, the operating piece is rotationally arranged on the end cover, and the operating piece comprises a knob, the knob is exposed rearward from the end cover. The knob is convenient for the user to screw.

[0011] As a preferred, at least two limiting columns are arranged on the end cover, the adjusting piece comprises a vertically arranged plate portion, and the elastic piece abuts on the plate portion; a same number of limiting holes as the limiting columns are arranged on the plate portion, and the limiting columns are inserted into the limiting holes. The limiting columns and the limiting holes peripherally limit the adjusting piece, so that the adjusting piece cannot rotate and can only move under the thread driving.

[0012] As a preferred, a reinforcing rib is arranged between the limiting column and the end cover, a notch is arranged on the plate portion beside the limiting hole, the notch communicates with the limiting hole, and the notch is configured to avoid the reinforcing rib.

[0013] As a preferred, the length of the limiting column is greater than the thickness of the plate portion, and the length of the limiting column ranges from 38 to 50 mm. The length of the limiting column needs to ensure the displacement stroke of the adjusting piece, so the length is relatively long.

[0014] As a preferred, the adjusting piece further comprises a cylinder portion, the cylinder portion protrudes forward from the plate portion, and the rear end of the elastic piece is sleeved on the cylinder portion.

[0015] As a preferred, a convex seat is arranged on the sliding piece, and the front end of the elastic piece is sleeved on the convex seat.

[0016] As a preferred, the elastic piece is a spring.

[0017] Preferably, the accommodating groove is provided with at least two sliding shafts arranged along the front-rear direction, and the sliding member is sleeved and slidably arranged on the sliding shafts.

[0018] The design starting point, concept and beneficial effects of the utility model with the technical scheme are as follows:

[0019] From the structural aspect, the overall structure design is simple and ingenious. Only several key components such as the base, the sliding member, the elastic member, the adjusting member and the operating member are used, and the complex and redundant design is abandoned. Such simple structure layout not only reduces the difficulty and cost in the production process, but also reduces the potential fault hidden danger caused by too many components, and improves the reliability and stability of the product. Moreover, the simple structure also makes the assembly and disassembly of the product easier, and facilitates the later maintenance and maintenance.

[0020] In the back force adjustment aspect, only one elastic member can realize the accurate adjustment of the back force. The traditional back force adjustment mechanism often needs multiple elastic members to cooperate with each other, which not only increases the cost and complexity of the structure, but also may affect the adjustment accuracy and stability. The single elastic member in the mechanism can flexibly change the elastic force applied to the sliding member under the action of the adjusting member by using its own elastic deformation characteristics. When the operating member drives the adjusting member to move forward, the elastic member is compressed, the elastic force increases, and the support force of the chair back to the child's back increases. When the operating member reversely rotates to move the adjusting member backward, the elastic member is elongated, the elastic force decreases, and the chair back support force correspondingly weakens. This adjustment method is direct and efficient, which can adapt to the physical characteristics and use requirements of children of different ages. This makes the child chair provide appropriate back support for children in different growth stages, prolongs the use cycle of the product, and improves the performance-price ratio of the product.

[0021] The rear end of the operating member is exposed to the base, which is convenient for the user to directly rotate and operate by hand. Without the help of additional tools or complex operation steps, both parents and children can easily operate. This simple and convenient operation method enables the user to adjust the back force at any time and quickly according to the actual needs, thereby improving the use experience. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic view of the child chair in the embodiment of the utility model;

[0023] Figure 2 It is a three-dimensional structure schematic view of the back device in the embodiment of the utility model;

[0024] Figure 3 It is a three-dimensional structure schematic view of the sliding member in the embodiment of the utility model, wherein the front end of the sliding member is exposed to the base;

[0025] Figure 4 It is the sectional view of the back device of the chair back in the embodiment of the utility model;

[0026] Figure 5 It is the three-dimensional structure schematic view of the support in the embodiment of the utility model;

[0027] Figure 6 It is the back view of the support in the embodiment of the utility model;

[0028] Figure 7 It is the three-dimensional structure schematic view of the sliding shaft inserted in the first sink in the embodiment of the utility model.

[0029] Figure 8 It is the three-dimensional structure schematic view of the sliding member arranged on the sliding shaft in the embodiment of the utility model;

[0030] Figure 9 It is the three-dimensional structure schematic view of the sliding member in the embodiment of the utility model;

[0031] Figure 10 It is the three-dimensional structure schematic view of the sliding shaft inserted in the second sink in the embodiment of the utility model;

[0032] Figure 11 It is the three-dimensional structure schematic view of the operating member arranged on the end cover in the embodiment of the utility model;

[0033] Figure 12 It is the three-dimensional structure schematic view of the end cover in the embodiment of the utility model;

[0034] Figure 13 It is the three-dimensional structure schematic view of the adjusting member in the embodiment of the utility model;

[0035] Figure 14 It is the plane sectional view of the back device of the chair back in the embodiment of the utility model.

[0036] The reference numerals are: support 100, chair seat 200, base 300, chair back 400, back support 1, base 2, mounting shell 21, first sink 211, auxiliary limiting groove 212, convex strip 213, opening 214, window 215, end cover 22, second sink 221, limiting column 222, reinforcing rib 223, accommodating groove 3, sliding member 4, sliding block 41, limiting strip 42, convex base 43, sliding shaft 5, operating member 7, knob 71, adjusting member 8, plate part 81, limiting hole 811, notch 812, barrel part 82, control member 9, locking member 10, second clamping tooth 101, locking strip 11, first clamping tooth 111. DETAILED DESCRIPTION

[0037] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] The specific implementation of this utility model is as follows:

[0041] like Figure 4 , 9 As shown in Figure -14, this utility model provides a child chair backrest force adjustment mechanism, including a base 2, a sliding member 4, an elastic member (not shown), an adjusting member 8, and an operating member 7. The base 2 is provided with a receiving groove 3, and the sliding member 4 is slidably disposed in the receiving groove 3. The front end of the sliding member 4 protrudes from the base 2 and is configured to connect with the chair back 400. The operating member 7 is rotatably disposed at the rear end of the base 2, and the rear end of the operating member 7 protrudes from the base 2. The adjusting member 8 is circumferentially limited and disposed in the receiving groove 3 with the base 2 and is sleeved on the operating member 7. The adjusting member 8 and the operating member 7 are threadedly connected. The elastic member is disposed between the adjusting member 8 and the sliding member 4 and always provides a forward elastic force to the sliding member 4. When the operating member 7 rotates and drives the adjusting member 8 to move forward in the receiving groove 3 through the thread, the adjusting member 8 compresses the elastic member, increasing the elastic force provided by the elastic member to the sliding member 4. When the operating member 7 rotates and drives the adjusting member 8 to move backward in the receiving groove 3 through the thread, the elastic member extends and weakens the elastic force provided by the elastic member to the sliding member 4.

[0042] From a structural perspective, the overall design is simple, reducing the cost of using parts. In terms of back-end force adjustment, only one elastic element is needed to achieve precise adjustment of the back-end force, avoiding the use of too many elastic elements and increasing the stability of the adjustment. The rear end of the operating element is exposed on the base, making it convenient for users to operate by hand. This allows users to adjust the back-end force quickly and easily according to actual needs, improving the user experience.

[0043] Specifically, such as Figures 1-4As shown, the chair back sliding mechanism is applied to a child chair, which comprises a seat 200, a base 300 and a back device, the seat 200 is arranged on the base 300, the back device is arranged on the seat 200, the back device comprises a support 100 and a chair back 400, the support 100 comprises a back support 1 and a base 2, the back support 1 is L-shaped, the lower end of the back support 1 is connected with the seat 200, the base 2 is arranged on the upper part of the back support 1 and arranged along the front-rear direction, the base 2 comprises a mounting shell 21 and an end cover 22, the mounting shell 21 is internally provided with a receiving groove 3, the end cover 22 is arranged at the rear of the mounting groove and fixedly connected with the mounting shell 21 through screws; the base 2 is internally provided with two sliding shafts 5, the two sliding shafts 5 are both arranged along the front-rear direction and span the receiving groove 3, the two sliding shafts 5 are symmetrically arranged, the sliding shafts 5 are slidably provided with a sliding piece 4, the left and right ends of the sliding piece 4 are protrudingly provided with sliding blocks 41, the two sliding blocks 41 are respectively sleeved on the sliding shafts 5 on the same side and slidably matched; the mounting shell 21 on the front of the receiving groove 3 is further provided with an opening 214, the front end of the sliding piece 4 is exposed from the opening 214 to the receiving groove 3 and connected with the chair back 400 together. This realizes smooth sliding of the chair back 400 in the seat depth direction.

[0044] More specifically, as shown in Figures 5-11 , the front end wall of the receiving groove 3 in the mounting shell 21 is provided with the same number of first grooves 211 as the sliding shafts 5, and the front side wall of the end cover 22 is also provided with the same number of second grooves 221; the two ends of the sliding shaft 5 are arranged in the first groove 211 and the second groove 221 respectively, so as to realize detachable connection of the sliding shaft 5 on the support 100, at this time, the sliding shaft 5 is erected in the receiving groove 3, and the sliding piece 4 arranged thereon is also erected by the sliding shaft 5 and will not rub against the inner wall of the mounting shell 21; in this embodiment, the sliding shaft 5 is a columnar body, and the sliding shaft 5 is metal, so as to further reduce the friction force; in the sliding direction, i.e. the front-rear direction, the length of the sliding block 41 is less than the length of the sliding piece 4, which can reduce the contact area, reduce friction and improve the smoothness of movement.

[0045] Further, as shown in Figure 4 , 6 , 7, 9, the sliding piece 4 is protrudingly provided with a limiting strip 42, the receiving groove 3 is provided with an auxiliary limiting groove 212 on the end face close to the limiting strip 42, the limiting strip 42 protrudes towards the auxiliary limiting groove 212 and is suspended in the auxiliary limiting groove 212. In normal use, the limiting strip 42 is completely separated from the auxiliary limiting groove 212 and does not increase the excess friction force, while when the service life of the chair back 400 is weakened or subjected to a larger load force, if the sliding shaft 5 cannot bear or the sliding piece 4 shakes, the auxiliary limiting groove 212 will limit the limiting strip 42 and keep the sliding piece 4 still able to operate normally.

[0046] The groove wall of the accommodating groove 3 beside the sliding block 41 is provided with a convex strip 213, and two convex strips 213 are arranged above and below and outside the sliding block 41, and two left-right symmetrical convex strips 213 are arranged below the whole sliding member 4. The sliding block 41 and the sliding member 4 have gaps with the convex strip 213, and the gap between the convex strip 213 and the sliding block 41 and the sliding member 4 is smaller than the gap between the groove wall of the accommodating groove 3 and the sliding block 41 and the sliding member 4. The convex strip 213 has the same effect as the limiting strip 42 and the auxiliary limiting groove 212, and also protects the mechanism in the case of failure of the sliding shaft 5 or shaking of the sliding member 4.

[0047] In addition, the sliding of the chair back 400 has self-adaptive ability, that is, the back-pursuing effect:

[0048] The sliding member 4 is also a rear-opened shell, and a resilient member is arranged between the end cover 22 and the sliding member 4. The resilient member is an extension spring, and the resilient member always gives the sliding member 4 a forward elastic force, so that the chair back 400 has the back-pursuing effect.

[0049] Specifically, as shown in Figures 4-13 The end cover 22 is rotationally provided with an operating member 7, most of the operating member 7 is located in the accommodating groove 3, and the rear end of the operating member 7 is exposed to the end cover 22. The part of the operating member 7 located in the accommodating groove 3 is provided with an external thread, and an adjusting member 8 is sleeved on the operating member 7. The adjusting member 8 is located in the accommodating groove 3 and is provided with an internal thread. The adjusting member 8 is threadedly connected with the operating member 7, and the adjusting member 8 is also circumferentially limited with the base 2 and moves forward and backward in the accommodating groove 3 when the operating member 7 rotates. Most of the resilient member is located in the sliding member 4, and the front and rear ends of the resilient member abut on the sliding member 4 and the adjusting member 8 respectively. The operating member 7 comprises a knob 71, which is exposed to the end cover 22 rearward to facilitate screwing.

[0050] Furthermore, the end cap 22 is provided with at least two limiting posts 222, and the adjusting member 8 includes a vertically arranged plate portion 81, on which an elastic member abuts; the plate portion 81 has the same number of limiting holes 811 as the limiting posts 222, and the limiting posts 222 are inserted into the limiting holes 811; in this embodiment, there are two limiting posts 222, which are symmetrically arranged on the end cap 22 and extend toward the receiving groove 3, and the limiting holes 811 are also located at the left and right ends of the end cap 22; when the adjusting member 8 slides back and forth, the limiting posts 222 also serve as guides for the adjusting member 8. A reinforcing rib 223 is provided between the limiting posts 222 and the end cap 22, and a notch 812 is provided on the side of the limiting hole 811 in the plate portion 81, the notch 812 communicating with the limiting hole 811, and the notch 812 is configured to avoid the reinforcing rib 223. The length of the limiting post 222 is greater than the thickness of the plate portion 81, and the length of the limiting post 222 ranges from 38 to 50 mm. In this embodiment, the length of the limiting post 222 is 41 mm. The adjusting member 8 also includes a cylindrical portion 82, which protrudes forward from the plate portion 81, and the rear end of the elastic member is sleeved on the cylindrical portion 82. The sliding member 4 is provided with a boss 43, and the front end of the elastic member is sleeved on the boss 43.

[0051] The 400mm sliding backrest also has a locking function:

[0052] Specifically, such as Figure 4 , 5 As shown in Figure 8, a locking mechanism is also provided between the sliding member 4 and the base 2. The locking mechanism includes a control member 9, a locking member 10, and a locking strip 11. The upper part of the mounting shell 21 has a window 215 communicating with the receiving groove 3. The control member 9 and the mounting shell 21 are movably connected at the window 215. The locking member 10 is disposed in the window 215 and is linked with the control member 9. The locking strip 11 is disposed on the sliding member 4. In this embodiment, the control member 9 is rotatably connected to the window 215, and the locking member 10 is simply movably placed in the window 215. Further, the locking strip 11 has a plurality of first teeth 111 arranged in the front-back direction. The upper part is provided with a second locking tooth 101. The control member 9 is configured to control the movement of the locking member 10 and make the second locking tooth 101 engage or disengage with the first locking tooth 111. When the control member 9 rotates to press the locking member 10 downward, the sliding member 4 is locked. When the control member 9 rotates to release the locking member 10, the sliding member 4 slides, and the second locking tooth 101 can lift the first locking tooth 111 and the locking member 10. The second locking tooth 101 will switch between different second locking teeth 101. There are multiple first locking teeth 111 and second locking teeth 101, and the spacing between the teeth is very small, which can achieve a stepless adjustment feel and maintain stability when locked.

Claims

1. A child chair recline force adjustment mechanism characterized by: The chair back adjusting device comprises a base, a sliding piece, an elastic piece, an adjusting piece and an operating piece. The base is provided with a receiving groove. The sliding piece is slidingly arranged in the receiving groove. The front end of the sliding piece is exposed from the base and is configured to be connected with the chair back. The operating piece is rotationally arranged at the rear end of the base. The rear end of the operating piece is exposed from the base. The adjusting piece is peripherally and limitingly arranged in the receiving groove and is sleeved on the operating piece. The adjusting piece is threadedly connected with the operating piece. The elastic piece is arranged between the adjusting piece and the sliding piece and always gives the sliding piece a forward elastic force. When the operating piece is rotated and drives the adjusting piece to move forward in the receiving groove through the thread, the adjusting piece compresses the elastic piece so as to increase the elastic force given by the elastic piece to the sliding piece. When the operating piece is rotated and drives the adjusting piece to move backward in the receiving groove through the thread, the elastic piece is elongated and the elastic force given by the elastic piece to the sliding piece is weakened.

2. The child chair recline force adjustment mechanism of claim 1, wherein: The base comprises an end cover. The end cover is arranged at the rear of the receiving groove. The operating piece is rotationally arranged on the end cover. The operating piece comprises a knob. The knob is exposed rearward from the end cover.

3. The child chair recline force adjustment mechanism of claim 2, wherein: The end cover is provided with at least two limiting columns. The adjusting piece comprises a vertically arranged plate portion. The elastic piece is abutted on the plate portion. The plate portion is provided with limiting holes of the same number as the limiting columns. The limiting columns are inserted in the limiting holes.

4. The child chair recline force adjustment mechanism of claim 3, wherein: A reinforcing rib is arranged between the limiting column and the end cover. The plate portion is provided with a notch at the side of the limiting hole. The notch is communicated with the limiting hole. The notch is configured to avoid the reinforcing rib.

5. The child chair recline force adjustment mechanism of claim 3, wherein: The length of the limiting column is greater than the thickness of the plate portion. The length of the limiting column ranges from 38 mm to 50 mm.

6. The child chair recline force adjustment mechanism of claim 3, wherein: The adjusting piece further comprises a cylinder portion. The cylinder portion protrudes forward from the plate portion. The rear end of the elastic piece is sleeved on the cylinder portion.

7. The child chair recline force adjustment mechanism of claim 1, wherein: The sliding piece is provided with a convex seat. The front end of the elastic piece is sleeved on the convex seat.

8. The child chair recline force adjustment mechanism of claim 1, wherein: The elastic piece is a spring.

9. The child chair recline force adjustment mechanism of claim 1, wherein: At least two sliding shafts arranged in the front-rear direction are arranged in the receiving groove. The sliding piece is sleeved and slidingly arranged on the sliding shafts.

Images