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Back-rest device for chair

A technology of ratchet and pawl, which is applied in the field of cooperation between the backrest and the seat cushion, and can solve problems such as weakening the function of the backrest device

Inactive Publication Date: 2006-12-13
ARACO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the recessed area becomes deeper, the crash lug sinks there, restricting the normal operation of one pawl, which also impairs the function of the backrest

Method used

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  • Back-rest device for chair
  • Back-rest device for chair
  • Back-rest device for chair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be described below with reference to the accompanying drawings. figure 1 is a longitudinal sectional view of the backrest device 1 as an example of the present invention, it corresponds to image 3 Sectional view of line I-I shown. figure 2 is an exploded perspective view of the backrest device 1 . image 3 and 4 It is a front view of the backrest device 1 with some components removed. The backrest device 1 is designed for a backrest seat for a vehicle, and its basic structure is exactly the same as the backrest device disclosed in Japanese Patent Application No. 2000-313961, which is related to the applicant's application.

[0023] The backrest device 1 is composed of a fixed disc 11, a movable disc 12, a support shaft 13, a control lever 14, four sliding pawls 15 (15A, 15B, 15C, 15D), a rotating cam 16, a control arm 17, an operating plate 18, a Open plate 19, spiral spring 21 and fixed plate 22 constitute. In this mechanism, the fixed...

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PUM

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Abstract

A reclining device including a recess formed as a low-rigidity portion in a lateral portion of each of slide pawls which faces a lateral wall surface of a guide groove of a stationary disc (the lateral wall surface of a bearing wall portion). The stationary disc holds the slide pawls. If an enormous circumferential turning force is applied to the slide pawls from a ratchet, the recess functions as a point upon which a pawl body of each of the slide pawls is deflected in the direction in which the turning force is applied As a result, the pawl body quickly sinks into the lateral wall surface of the bearing wall portion. Thus, the slide pawls are prevented from moving away from the ratchet.

Description

technical field [0001] The present invention relates to a back rest device. The invention relates in particular to the cooperation of the backrest and the seat cushion. Background technique [0002] For example, a certain form of backrest is disclosed in Japanese Patent Application Publication No. 8-253063. The backrest device includes many pawls, a circumferential ratchet and a fixing frame, the above-mentioned pawl has external teeth on its front end side, the above-mentioned peripheral ratchet has internal teeth on its inner peripheral surface, and the above-mentioned fixed frame is used to fix the pawl , allowing them to move toward and away from the internal teeth of the ratchet. The backrest also includes a cam member that receives the pawl. The cam member presses the pawl forward so that the pawl engages the ratchet and locks thereon. When the cam member is subjected to a random operating force, it is driven, and the operating force of the pawl pressing on the rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A47C1/025B60N2/235B60N2/42
CPCB60N2/2356B60N2/236
Inventor 浦道秀辉
Owner ARACO CORP