Search

CN-122004611-A - Backrest assembly and seat

CN122004611ACN 122004611 ACN122004611 ACN 122004611ACN-122004611-A

Abstract

The invention discloses a backrest assembly and a seat, wherein the backrest assembly comprises a chair frame, a waist frame and a driving unit, wherein the chair frame is provided with a guide groove, the waist frame is movably connected to the chair frame, the driving unit comprises an electric push rod and a transmission assembly, a driving shaft of the electric push rod is obliquely arranged with the guide groove and forms an included angle smaller than 90 degrees, one end of the transmission assembly is abutted with the groove wall of the guide groove, the other end of the transmission assembly is connected with the waist frame and can drive the waist frame to move, and the electric push rod can drive one end of the transmission assembly to slide in the guide groove so as to drive the waist frame to move to a preset position, and then drive the waist frame to reciprocate. The integrated functions of support and massage are integrated, the lever transmission mechanism is utilized, the waist frame is precisely pushed to the support position under low load, the waist frame is driven by the mechanism to reciprocate to press the waist, precise and powerful massage is realized, high-efficiency support and active relief depth are fused, and the seat health function and the user experience are remarkably improved.

Inventors

  • YOU ZHAOGEN
  • PANG ZHIFENG
  • HAN JIANRUI

Assignees

  • 佛山市零动创想科技有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. A backrest assembly, comprising: the chair frame is provided with a guide groove; The waist frame is movably connected with the chair frame; The driving unit comprises an electric push rod and a transmission assembly, wherein a driving shaft of the electric push rod and the guide groove are obliquely arranged and form an included angle smaller than 90 degrees, one end of the transmission assembly is abutted to the groove wall of the guide groove, and the other end of the transmission assembly is connected with the waist frame and can drive the waist frame to move; the electric push rod can drive one end of the transmission assembly to slide in the guide groove so as to drive the waist frame to move to a preset position, and then the electric push rod drives the waist frame to reciprocate.
  2. 2. A backrest assembly as claimed in claim 1, wherein the surface of the lumbar support is provided with an elastic mesh, a soft pad or a rigid block.
  3. 3. A backrest assembly as in claim 1, wherein the guide slots are disposed obliquely; and/or the driving shaft of the electric push rod is arranged downwards, and the guide groove is arranged at the bottom end of the electric push rod and extends upwards along one side facing the waist frame.
  4. 4. A backrest assembly according to any one of claims 1 to 3, wherein the transmission assembly comprises a sliding shaft and a transmission rod, at least part of the sliding shaft is arranged in the guide groove and is in sliding fit with the guide groove, and the sliding shaft is arranged at one end of the transmission rod, which is away from the lumbar support and can drive the transmission rod to move.
  5. 5. The backrest module as set forth in claim 4, wherein the end of the transmission rod facing away from the lumbar support is hinged with the driving shaft of the electric push rod through the sliding shaft; and/or one end of the transmission rod, which is away from the sliding shaft, is hinged with the waist frame; And/or the driving shaft of the electric push rod can axially stretch, the transmission rod is connected to the bottom end of the driving rod of the electric push rod and extends upwards along one side facing the waist frame, an included angle between the length direction of the guide groove and the stretching direction of the electric push rod is A, an included angle between the length direction of the guide groove and the extending direction of the transmission rod is B, when the sliding shaft is positioned at the bottom end of the guide groove, the included angle is more than or equal to 25 degrees and less than or equal to 45 degrees, 2 degrees and less than or equal to 20 degrees, and when the sliding shaft is positioned at the top end of the guide groove, the included angle is more than or equal to 40 degrees and less than or equal to 60 degrees, and the included angle is more than or equal to 20 degrees and less than or equal to 40 degrees.
  6. 6. A backrest assembly as set forth in claim 4 wherein said chair frame is fixedly provided with two spaced apart partitions, at least a portion of said drive rod is disposed between said two partitions, said guide slots are disposed in one-to-one symmetry with respect to said two partitions, and said sliding shaft has two ends slidably engaged with said two guide slots, respectively.
  7. 7. The backrest module as recited in claim 1, wherein the seat frame is fixedly provided with a fixed seat, and the electric push rod is rotatably mounted on the fixed seat at an end facing away from the end connected with the transmission module.
  8. 8. A back rest assembly according to claim 1, wherein the transmission assembly is connected to the underside of the lumbar frame, and wherein a back rest is connected to the chair frame, the back rest being flexibly and/or rotatably connected to the upper side of the lumbar frame to remain relatively stable when the lumbar frame is moved.
  9. 9. The back rest assembly according to claim 8, wherein the back rest is vertically slidably disposed on the chair frame; And/or, the back frame is fixedly provided with a first rotating rod at one side connected with the waist frame, the waist frame is fixedly provided with a second rotating rod at one side connected with the back frame, and the first rotating rod is hinged with the second rotating rod; and/or a deformation sleeve is arranged at the joint of the back frame and the waist frame so as to absorb the displacement of the waist frame.
  10. 10. A seat comprising a backrest assembly as claimed in any one of claims 1 to 9.

Description

Backrest assembly and seat Technical Field The invention relates to the technical field of seats, in particular to a backrest assembly and a seat with the backrest assembly. Background Currently, the lumbar support adjustment technology of the main ergonomic seats in the market is mainly divided into two types, manual adjustment and electric adjustment. For example, manual adjustment lumbar support usually realizes the locking and releasing of the position by manually pulling a pulling button, rotating a hand wheel or directly pushing and pulling the lumbar support at the side or the rear of a seat by a user, and the technical scheme has the advantages of relatively simple structure and low manufacturing cost, but has the defects that the adjustment process depends on manpower, the operation steps are complicated, fine and precise positioning cannot be realized, in addition, the lumbar support lacks active supporting capability, when the body of the user leans back and applies pressure to the lumbar support, the lumbar support is easy to retract or even fail after the user is leaned back, stable and continuous supporting force cannot be provided, and the supporting effect is greatly compromised. In order to overcome the defect of manual adjustment, the user experience and the technological sense of products are improved, the electric waist rest is generated, a small driving motor or an electric push rod is usually used as a power source, and the rotary motion of the motor or the linear motion of the push rod is directly transmitted to the waist rest through a gear, a screw rod or a direct connecting rod mechanism, so that the automatic and powerful position adjustment is realized. In the existing typical electric lumbar support structure, the fixed end of the electric push rod is hinged to the chair frame, and the telescopic shaft of the electric push rod is directly connected with the back surface of the lumbar support or through a straight connecting rod, when the push rod is extended or shortened, the lumbar support is directly pushed to do linear motion parallel to the axial direction of the push rod. However, because the volume, the maximum telescopic travel and the installation layout of the electric push rod in a narrow chair back space are strictly restricted, the linear displacement of an output shaft of the electric push rod is limited, and the adjustment travel of the lumbar support is completely dependent on the linear displacement, the final lumbar support front-rear adjustment range is directly caused to be smaller, the personalized requirements of a user group with large height difference on lumbar support depth and height are difficult to meet, and the universality and high-end positioning of products are limited. In addition, in the above-mentioned direct pushing structure, the driving member is not only the output of the displacement, but also the force-bearing member which bears the main reaction force in the lumbar operation state, when the body of the user leans backward, a forward pressure is applied to the lumbar, and the pressure is transmitted to the output shaft of the electric push rod directly through the transmission link without buffering, which means that the driving motor of the electric push rod is required to not only overcome the internal mechanical friction to drive the load, but also continuously provide a huge reverse locking force or supporting force which is approximately equal to the pressure applied by the user when the load works. The long-term and high-load operation condition is extremely easy to cause overheat of the motor, aggravation of abrasion of the gear box and increase of noise, seriously influences the service life, reliability and mute performance of the driving unit, and increases the failure rate and after-sales maintenance cost of the product. Furthermore, with the deep application, it is increasingly recognized that resting or passive support alone is insufficient to cope with the constant tension and stiffness of deep muscle groups resulting from the long-term maintenance of a fixed posture, and there is a great market demand for new seating solutions that can provide active intervention and dynamic relaxation. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the backrest component provided by the invention integrates the functions of supporting and massaging, the lumbar support is precisely pushed to the supporting position under a low load, and the lumbar support is driven by the mechanism to reciprocally press the lumbar, so that the precise and powerful massaging is realized, the whole structure is compact, the control is simple and convenient, the efficient supporting and the active relieving depth are combined, and the seat health function and the user experience are obviously improved. The invention also provides a seat with the backrest assembly. A backr