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Device for adjusting the reclinning force in office chair mechanisms

A technology for office chairs and equipment, applied in chairs, deck chairs, applications, etc., can solve problems such as structural complexity

Active Publication Date: 2008-04-16
IMARC SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still an insurmountable difficulty between overcoming all friction and achieving the necessary ease of adjustment due to the structural complexity of the control

Method used

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  • Device for adjusting the reclinning force in office chair mechanisms
  • Device for adjusting the reclinning force in office chair mechanisms
  • Device for adjusting the reclinning force in office chair mechanisms

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] As can be seen from Figures 7-10, the adjustment device of the present invention is applied to an office chair mechanism comprising a backrest comprising a fixed box-shaped structure 1 provided below with a frusto-conical bushing, This bushing is intended to be inserted into the upper end of the rod of a conventional gas spring (not shown in the drawings), the purpose of which is to support the reclining mechanism on the support base.

[0019] A connecting element 4 connected to the box-shaped structure 1 connects the fixed structure 1 to a plate element 3 rigidly connected to the chair by means of pins 21 and 23 . The movable element 2 is rigidly connected to the backrest (not shown) and is pivotally connected by means of a pin 5 to the fixed box-shaped structure, to the element 3 which is rigidly connected to the chair by means of a pin 22 .

[0020] A pivot pin 8 for a lever 7 is fixed to the box-shaped structure 1 , the lever 7 has a bearing surface 11 and its free ...

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PUM

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Abstract

A device for adjusting the reclining force in office chair mechanisms comprising at least two mutually hinged parts and elastic means (16) which maintain said parts elastically spaced apart, said device being characterized by comprising:—at least two levers (7, 6), at least one of which interacts with said elastic means (16) and the other of which is connected to one of said hinged parts, said levers respectively interacting via at least one movable contact element (13) by way of contact surfaces,—means (9, 10, 14) for adjusting the position of said movable contact element (13) such as to modify the points at which said movable contact element bears on said contact surfaces and consequently such as to modify the lever arms.

Description

technical field [0001] The invention relates to a device for adjusting the recoil force in the mechanism of an office chair. Background technique [0002] There have been proposed a number of mechanism adjustment devices that vary the recoil force according to the size and preferences of the user, however most of these operate according to spring preload. [0003] If a compression spring is used, an adjustment knob arranged coaxially with the spring is actuated. If a torsion spring is used, the preload is varied by using an element that pulls or pushes on the free end of the spring (shown schematically in Figure 1). [0004] The main disadvantage of this system is that the preload adjustment cannot be too large, otherwise there will be insurmountable problems related to the reliability of the spring and the miniaturization of the chair design. In addition to overcoming the spring force during adjustment, there must always be a strict balance between the physical forces and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A47C1/032
CPCA47C1/03255A47C1/03272A47C1/03266
Inventor C·戈吉
Owner IMARC SPA