Giroflex-entwicklungs-ag

Other

Hermann Locher

Chair

The invention relates to a load-bearing frame for a chair, in particular for an office chair, which can be adjusted in terms of its height and inclination and comprises a seat carrier (1), a backrest carrier (2), a load-bearing and pivoting device (80) and a standing column (5). By means of struts (46, 32) arranged on the knee side and backrest side and supported on a spindle body, the seat carrier and backrest carrier (1, 2) are mounted on a spindle body such that they can pivot about a horizontal axis (X), oriented transversely to the seat direction, against the restoring force at least of a first spring element (40, 40'), and, in any position, can be fixed, and released again, by a second spring element. On the standing column (5) there is arranged a retaining device (10) through which the spindle body passes in the horizontal direction and on which a bracing element (20), by means of which the restoring force of the first spring elements (40, 40') can be adjusted, is mounted such that it can pivot about a bolt (15).

Chair, in particular office chair

There is proposed a chair, particularly an office chair, of adjustable height and inclination which has a seat support (75), a backrest support (80), a standing column (10) with first gas spring (20) arranged therein, a support member (25) arranged in horizontal plane on the standing column (10), and a first guide rod (65) and a second guide rod (70). The second guide rod (70) is mounted with two struts laterally on the support member (25) and is functionally connected with a transmission mechanism. The transmission mechanism arranged in the support member (25) is developed as an angular gearing which transmits the swinging movement of the second guide rod (70) which is oriented in the direction of the arrow B', on the one hand, by correspondingly arranged swing levers (62, 62') to a second gas spring (60) which is spaced from and parallel to the support member (25) and, on the other hand, via a tensioning device arranged in the support member (25), to the gas spring (20) which is arranged in the standing column (10).

An adjusting mechanism for an adjustable chair includes a control mechanism, by means of which a control push rod of a spring mechanism is adjusted from a locking position to an unlocking position. In the unlocking position, the chair frame which comprises a seat carrier, a back rest carrier and a pedestal constituted by a pillar and a support part, can undergo a positional adjustment. The locking and unlocking positions are set with a single handle of an operating member which effects a displacement of two control bolts provided with meshing tooth systems, which makes the adjusting mechanism simpler and more advantageous to use.

Adjusting mechanism for an adjustable chair

A chair frame comprises a seat part and a backrest part. A spring connecting portion, which is fixed by a pivot joint to the free end of a support arm is provided at the knee side of the seat part. To the backrest part is fixed at least one backrest strut, which is mounted by means of a pivot joint on a slide, which is displaceably guided in the support arm. A compression spring is mounted in the support arm. One end of the compression spring is connected to the slide while its other end is mounted by means of a pivot joint in the side walls of the support arm. A lever is connected to the spring connection portion at the knee side. An adjusting screw is connected to the lever. The adjusting screw adjusts the bias of the knee side spring portion of the seat part.

Chair frame

The adjusting mechanism is used for exerting a force on two components moveable relative to one another and comprises a cylinder, a piston and a piston rod. A guide rod is also provided on the piston and is guided in a guide connection of a bottom cylinder casting. A control piston is displaceably guided in a longitudinal bore of the piston and in a further longitudinal bore of the guide rod. The piston contains transfer ducts, which are either obturated by the control piston or are freed or exposed by a smaller diameter portion of the control piston. An inner cylinder chamber is completely filled with a flowable or fluid grease. As a result, the piston rod can be locked in position by the control piston closing the transfer ducts and, on releasing or opening the latter, the piston rod can be moved. The locking of the adjusting mechanism in a specific position, as is particularly required in the case of tiltable chairs, is consequently facilitated in comparison to known adjusting mechanisms. In addition, by using flowable grease, the sealing of the adjusting mechanism is made simpler.

Adjusting mechanism, particularly for tiltable and vertically adjustable

The adjusting device possesses a hydraulic cylinder in whose cylinder tube there are housed a main piston equipped with a piston rod, an auxiliary piston and a force-exerting spring. The cylinder tube is closed off at both of its ends by an associated end flange. The outer surface of the cylinder tube simultaneously constitutes the guide surface of a guide tube which is fixedly connected by means of a connecting flange with the piston rod. Since the cylinder tube possesses an essentially constant or uniform inner diameter and outer diameter, the guide tube can be constructed to be so long that the adjusting device is stable enough to serve as a supporting column or pillar, e.g. for a chair or other seat structure.

Adjusting device, particularly for adjustable chairs

The chair has a seat or seat portion equipped with a balance and its linkage structure has links fixed in articulated manner to a support arm and to which there is articulated a balance device in parallelogram-like manner. A slide is slidingly guided on the balance device and is connected by means of a thrust rod to an extension arm of the backrest-side link. The slide is also connected to one end of a spring element, the other end of which is supported on the balance device. The linkage structure is supported on the backrest by means of a backrest strut articulated to the slide. The seat and backrest portions of the chair frame can be constructed as a plastic shell with a knee-side bending joint and a further bending joint between the seat portion and the backrest portion. Due to the construction of the chair frame to incorporate a balance device, as least part of the forces exerted by the occupant or user of the chair can be absorbed by the balance device, so that the spring element can be made smaller and therefore less expensively, and there is also no need to adjust or adapt the spring element to different body weights of the users of the chair.

Inclinable chair provided with balance or rocker structure

The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the backrest holder. At an arm or arm structure of the backrest holder extending in a direction towards the front end of the chair support where the seat user's legs will fit, a guide rod or link and the piston rod of a spring element are rotatably mounted by means of a third swivel joint, while at the other end of the chair support, the spring element is mounted by means of a holding bracket at a swivel joint supported in the supporting structure. At the spring element, there is provided an operating slide tappet or plunger for alternately blocking and allowing free movement of the spring element, which is operable by means of an operating or actuating mechanism composed of a rod and a two-armed angle lever mounted in the holding bracket and by means of an adjusting lever. Operatively associated with the adjusting lever is a locking mechanism which makes possible the blocking and free movement of the spring element using just the adjusting lever.

Chair support with adjustment device

The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is pivotably or swivelably connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the backrest holder. The backrest holder possesses an arm or arm structure and a substantially flat-surfaced hollow tube which is fitted and fastened in a holding support of the arm. The arm or arm structure projecting into about the middle of the chair support between the first and the second swivel joint is connected with a third swivel joint by means of guide rods or links which are supported at the supporting structure by means of a fourth swivel joint. A first spring element engages at the third swivel joint and a second spring element engages at the supporting structure. Both spring elements are releasable and blockable by means of operating or actuating rods. In spite of the space-saving and simple construction of the chair support, the usual seating comfort of such chairs is offered.

Chair support

A seat carrier and a back rest carrier are linked by pivot joints through a lever to a carrying or swivelling component. At the end of the seat carrier on the back rest side there is connected a chain of link members which at its other end is connected to a slide and a back rest. When the chair inclines towards the rear, the chain of link members causes the slide and the back rest to conjointly move in a downwards direction. The so-called undressing effect caused by the change-over from the normal position into the rearwardly inclined position of the back rest is eliminated in a simple and space saving manner and without exploiting the space below the seat carrier. By arranging a spring element, for instance a gas spring, in the knee region of the chair, ready access can be had to the spring element for arresting it.

Growing community of inventors

Dornach, Switzerland

Hermann Locher