Chair capable of tilting back and forth

Abstract

The invention discloses a chair capable of tilting back and forth. The chair comprises a base, a chair seat, a chair back frame and an overturning frame, the front end and the rear end of the chair seat are hinged to the upper end of the overturning frame and the middle section of the chair back frame respectively, and the front end and the rear section of the base are hinged to the lower end of the overturning frame and the front end of the chair back frame respectively; the back end of the chair back frame is fixedly connected with the chair back frame; the bottom of the rear section of the base is fixedly connected with a chair leg frame; the base inclines downwards from the front end to the rear end, so that a vertical gap between the chair seat and the base is gradually increased from front to back; the chair back frame inclines upwards from the front end to the rear end, so that a vertical gap between the chair seat and the chair back frame is gradually reduced from front to back; and the seat is used for fixedly mounting a cushion. The beneficial effect of the invention is that the comfort level can be improved.

Description

technical field [0001] The invention relates to a chair, especially a chair that can be tilted back and forth. Background technique [0002] At present, many of the office chairs used in the office, or the leisure chairs used in daily leisure, have the function of tilting forward and backward, and also have the function of locking the tilting angle and adjusting the degree of tightness of the tilting. [0003] For example, the patent application with the prior art publication number of CN109393798A discloses a wire control device for adjusting the inclination and tightness of the seat back frame. A wire control device for adjusting the tilt and tightness of the back frame of a seat, comprising a back frame tilt adjustment wire control device and a back frame elastic adjustment wire control device arranged in the seat; the back frame tilt adjustment wire control device It includes a back frame connected to a tail plate, an inclination adjustment mechanism, an inclination pul...

AI Technical Summary

Problems solved by technology

[0006] First, it is more troublesome to adjust the tightness in a large span. The user cannot directly adjust across the span, but needs to turn the knob repeatedly to adjust step by step, which is more troublesome to use; moreover, the fineness of this adjustment mode is proportional to the degree of rotation of the knob. ratio, resulting in a contradiction between performance and ease of use

[0007] Second, the degree of tightness of the knob is directly proportional to the degree of tightness of the front and rear tilt adjustments. During the adjustment process from loose to tight, the force required to rotate the knob will gradually increase, which is more user-friendly. Difference

These two elastic devices in the prior art cannot achieve this experience. If the adjustment is looser, the braking effect will be poor if you tilt back and forth quickly, and the frustration will be stronger when you tilt back to the maximum angle to stop; if the adjustment is tighter , can ensure the braking effect, but the damping of the forward tilt and the backward tilt is relatively large, and it is impossible to quickly tilt forward and backward

[0009] Secondly, in these two patent applications, the locking of the front and rear tilting angles is achieved through the arc-shaped plate-shaped structure in a plug-fit manner. The arc-shaped plate-shaped structure occupies the space in the vertical direction, so that the chair located above There is almost no structural gap between the seat and the base below. The base is basically directly supported on the bottom surface of the seat, making the seat a rigid structure. When the user sits on the cushion, the pressure on the seat is controlled by the edge The center of the seat becomes larger gradually toward the center, so the downward depression shows a pit-like deformation trend, and the seat seat has a hard texture at the center of the cushion because there is no room for deformation buffer, and the comfort is not good; because there is no gap, after a long time of use It is easy to get stuck in the case of aging and deformation in the rear part

In addition, in the prior art CN111528639A, the seat (seat connector) and the base (tray) are connected, so the seat cannot be tilted back and forth synchronously, which makes the user experience poor

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