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Height-Adjusting Assembly for Office Chair Backrest

a technology for adjusting assembly and backrest, which is applied in the direction of chairs, movable seats, transportation and packaging, etc., can solve the problems of only providing these functions, sitter's tiredness, and adverse effects,

Inactive Publication Date: 2011-09-08
FUH SHYAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Hence, in order to solve the problem of the prior art where the chair backrest fails to be properly settled in height to support a sitter's back and waist, the present invention provides a structure which allows a backrest to be freely adjusted in height, so as to ensure a sitter's back and waist with optimal support.

Problems solved by technology

However, while the effectiveness of most of these waist-protecting devices has not been proven, excessive dependency on such waist-protecting devices may bring about adverse effects.
Besides, the long-term still sitting posture (lacking for change in posture) is likely to result in the sitter's tiredness.
However, chairs can only provide these functions when properly designed.
Otherwise, an excessive sitting depth may hinder the lumbar vertebra from contacting the backrest and in turn from getting supported.

Method used

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  • Height-Adjusting Assembly for Office Chair Backrest
  • Height-Adjusting Assembly for Office Chair Backrest
  • Height-Adjusting Assembly for Office Chair Backrest

Examples

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Embodiment Construction

[0020]Referring to FIGS. 1, 2, 3 and 4, the present invention has a supporting unit 1 assembled to a chair and a backrest 2 that is mounted on the supporting unit 1 and configured to vertically slide along and get positioned with respect to the supporting unit 1. The supporting unit 1 is a frame of a reversed-U shape and has two facing inner laterals each formed with a series of positioning teeth 11 so that the two series of positioning teeth 11 corresponding to each other. At an upper end and a lower end of each said series of positioning teeth 11, a retracting portion 12 and an expanding portion 13 are provided, respectively. In addition, two front laterals of the supporting unit 1 are each provided with a guiding groove 14.

[0021]Moreover, on the backrest 2 at where corresponds to the positioning teeth 11 of the supporting unit 1, sliding portions 21 are provided for connecting with the supporting unit 1. Each of the sliding portions 21 further includes a recessed part 211 formed ...

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PUM

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Abstract

A height-adjusting assembly for an office chair backrest includes a supporting unit mounted with a vertically movable backrest. The supporting unit and the backrest have correspondingly an engaging element and a series of positioning teeth, respectively, to be coupled mutually. Upper and lower ends of the series of positioning teeth have a retracting portion and an expanding portion for retracting and expanding the engaging element, respectively. When the backrest slides upward, the engaging element successively engages with one of the positioning teeth so as to position the backrest at a desired height. When the backrest reaches to an upmost position, the engaging element is pressed by the retracting portion and retracts so as to separate from the positioning teeth. Then the backrest reaches a bottommost position thereof has the engaging element expanded by the expanding portion, thereby allowing the engaging element to engage with the positioning teeth again.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a height-adjusting assembly for an office chair backrest, wherein a supporting unit mounted with a vertically movable backrest is fixed to a chair, while at least a series of positioning teeth and an engaging element that are configured to resiliently couple with each other are provided between the supporting unit and the backrest for allowing the backrest to vertically slide along and get positioned with respect to the supporting unit.BACKGROUND OF THE INVENTION[0002]Since modern people spend much more time in their offices then at home, whether an office chair is comfortable enough has become a major concern. In view of low back pain caused by long-term, constant sitting posture, some waist-protecting devices purported to be effective in preventing low back pain have been seen in the market. However, while the effectiveness of most of these waist-protecting devices has not been proven, excessive dependency on such waist-...

Claims

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Application Information

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IPC IPC(8): A47C7/40A47C3/00
CPCA47C7/402A47C7/46A47C7/405
Inventor TSAI, HSUAN-CHIN
Owner FUH SHYAN
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