Automatic waistrest adjusting device for office chairs

a technology for adjusting devices and waistrests, which is applied in the direction of chairs, movable seats, transportation and packaging, etc., can solve the problems of increased material and assembly costs, increased labor intensity, and increased labor intensity, and achieve the best ergonomic operation sta

Inactive Publication Date: 2012-08-02
CHEN CHING MING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]Based on the above-mentioned configuration, the waistrest in accordance with the invention is displaceable up a

Problems solved by technology

Regardless of a compression spring or a torque spring, the performance of the conventional waistrest adjusting device may be affected since the spring becomes elastically fatigue easily, particularly to the flexibility of the adjustment and t

Method used

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  • Automatic waistrest adjusting device for office chairs
  • Automatic waistrest adjusting device for office chairs
  • Automatic waistrest adjusting device for office chairs

Examples

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Embodiment Construction

[0024]With reference to FIGS. 2 to 9 for a waistrest adjusting device for office chairs in accordance with a preferred embodiment of the present invention, the waistrest adjusting device comprises: a seat 20, having chair legs 21 installed at the bottom of the seat 20; a stand 30, with the bottom pivotally coupled to a rear side of the seat 20; a backrest 40, disposed at the front of the stand 30, and having a framework 44 and an external cover 47 installed onto the framework 44, wherein the external cover 47 of this preferred embodiment is made of meshed cloth, but the present invention is not limited to such arrangement only; a waistrest 50, disposed at the bottom of the of framework 44 of the backrest 40. The above-mentioned techniques are involved in prior arts, therefore, no more details are described here.

[0025]The present invention is characterized in that one or more upper installation notches 41 with opening aligned downward are formed at the bottom of the framework 44, and...

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PUM

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Abstract

An automatic waistrest adjusting device for office chairs includes a waistrest combined with the bottom of a backrest, and the waistrest comes with a design of connecting a curved flexible metal plate and making use of whose flexibility to suspend the bottom of the waistrest that can be turned flexibly with a user's waist to achieve an ergonomic stepless angular adjustment to allow the user's waist to lean at the most comfortable position. The waistrest adjusting device combines the waistrest and the backrest by simple components and assembling method, and achieves the effects of preventing poor performance and quality caused by an elastic fatigue and extending the use life.

Description

BACKGROUND OF THE INVENTION[0001](a) Field of the Invention[0002]The present invention relates to a waistrest adjusting device for office chairs, and more particularly to a waistrest adjusting device with a structure that connects a curved flexible metal plate to the bottom of a backrest for automatically turning and adjusting the angle of a waistrest.[0003](b) Description of the Related Art[0004]According to U.S. Pat. No. 7,303,232, shown in FIGS. 1A and 1B and filed by the applicant of the invention, a “BACKREST ADJUSTING DEVICE FOR OFFICE CHAIRS” includes a back frame 10. A waistrest 12 is mounted at the center 11 of the back frame 10. The waistrest 12 is flexibly moved back and forth within the center 11 of the back frame 10 by means of two pivots and springs positioned within a tube body 15. In this way, an angular adjustment is achieved.[0005]According to U.S. Pat. No. 6,843,530, a “MULTI-STAGE BACKREST ASSEMBLY” includes a back plate positioned on a support frame. A waist pla...

Claims

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Application Information

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IPC IPC(8): A47C3/00
CPCA47C7/38A47C7/64A47C7/46
Inventor CHEN, CHING-MING
Owner CHEN CHING MING
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