FR2460648A1 - OFFICE CHAIR WITH SEAT AND BACK WITH ADJUSTABLE POSITION USING PNEUMATIC JACKS - Google Patents

Abstract

THE INVENTION RELATES TO AN OFFICE CHAIR. IN THIS, THE SEAT 1 IS FIXED TO THE SUPPORT 2 ASSOCIATED WITH THE ROD OF THE PNEUMATIC HEIGHT POSITIONING CYLINDER 4; THE BACKREST 6 IS FIXED TO A UPRIGHT 7 THAT CAN PIVOT ON THE SUPPORT 2 AND SUBJECT TO THE ACTION OF THE PNEUMATIC CYLINDER 10 INTENDED TO STOP THE BACKREST AT DIFFERENT INCLINATIONS AGAINST THE ACTION OF A SPRING 12; A SINGLE OPERATION LEVER 13 IS PROVIDED TO ACT DIRECTLY ON THE CYLINDER 4 AND INDIRECTLY ON THE CYLINDER 10 SO AS TO SELECTIVELY CONTROL THE POSITIONING IN HEIGHT AND IN TILT. THE INVENTION ALLOWS THE USE OF TWO OPERATING LEVERS TO BE AVOIDED.

Description

The invention relates to an office chair of the rotating type, with seat and

backrest with adjustable position

using pneumatic cylinders.

  Chairs of the aforesaid type are known in which the seat and the backrest are coordinated, by means of the corresponding supports, to corresponding pneumatic cylinders by means of which it is possible to obtain the positioning and the locking in the conditions

desired in each case.

  For actuation and out of action, the jack associated with the group carrying the seat and the backrest and the jack associated only with the backrest are each controlled by a manually movable operating lever

and independently of one another.

  Therefore, in the known type of construction, each chair must be provided not only with two pneumatic cylinders but also with two levers, one of which has the role of actuating the support carrying the seat and the backrest for their adjustment in height and whose other is intended for the angular displacements of these for the variation

their inclination.

  Obviously, the presence and assembly of two levers of maneuver complicate the structure of the adjustment mechanism of the chair, especially as the spaces

  available for this mechanism are still limited.

  On the other hand, the object of the invention is to provide an improved chair of the type mentioned above in which it is possible to adjust the position of the seat and the backrest by means of a single operating lever that can be moved into opposite senses

  for the alternative and independent adjustment of these components.

  Another object of the invention is therefore to produce a chair with seat and backrest subjected to action

  of pneumatic cylinders, comprising a single lever of -

  maneuver designed to act, although separately, both on the adjustment cylinder of the inclination of the seat and - 2- backrest that on the pneumatic cylinder of height adjustment of the seat and the backrest, which gives a

simpler construction.

  The construction details of the chair according to

  the invention will become more apparent in the description below.

  after that refers to an example of practical execution, represented by the drawings in which: Figure 1 shows an office chair as a whole; FIG. 2 shows in longitudinal section the assembly of the mechanism comprising in particular the support means for the seat and the backrest, the operating lever being at rest: FIG. 3 shows the assembly according to FIG. 2, in the adjustment phase 4 is a cross section along the arrows IV-IV of FIG. 2, showing the pivoting mounting of the operating lever, and FIG. 5 is a perspective of the aforesaid means.

adjustment.

  The chair in question comprises a support 2 mounted on the movable rod 3 of a first pneumatic cylinder 4 with a vertical axis, secured to the base 5 for example on wheels. In the support 2 is fixed the seat 1 which is fixed at the same time as the backrest 6, so as to have both an adjustable inclination, to an amount 7 articulated at the bottom by a horizontal transverse pivot 8 to the support 2 and subject to the action of the rod 9 of a second pneumatic cylinder 10 disposed in the support of the seat

and the file.

  The rod 9 of the second pneumatic jack 10 is connected to a crosspiece 11 spun to the upright 7 so as to be eccentric relative to the pivot 8 so that the rod acts on the upright against the action of at least one spring 12 in order to fix in each case, the file and

  the seat in the predetermined position.

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  In transverse direction to the support 2 which carries the seat and backrest is mounted, so as to be below the seat, an operating lever 13 mounted on the support 2 by means of a pivot 14 located in the middle part of the lever as seen on the

figure 4.

  This operating lever 13 has, inside the support 2, an intermediate portion 15 provided with a hole 16 in which passes, without contact, the pneumatic cylinder 10

related to the amount of the file.

  Part 15 of this operating lever 13 presents

  also a lower side 17 aligned with the pneumatic cylinder

  4 coordinated to the support, so as to act on this jack, and an upper side 18 for applying to the free end 19 of a rocker lever 20 mounted on the support 2 by means of a pivot 21 and having a spouted end 22 for acting on the pneumatic cylinder

related to the amount of the file.

  Essentially, by angularly moving the lever 13 downwardly around the corresponding pivot 14, it is possible to activate, by its upper side 18 acting on the rocking lever 20, the pneumatic cylinder for blocking and positioning at will of the inclination of the amount

the back of the chair.

  By moving the lever 13 in the opposite direction to the previous one, and thus upwards, it is possible, on the other hand, to act, via the lower side 17, on the pneumatic cylinder 4 for unlocking and positioning in position.

  support height 2 with seat and backrest of the chair.

  Pneumatic cylinders 4 and 10 and their mode of action

  are known and do not require special attention.

  In any case, the invention described above offers

  the advantage of being able to control the blocking and the position-

  the seat and the backrest of the chair both in inclination and in height, by means of the aforesaid pneumatic cylinders 4 and 10, by means of a single lever 4 maneuver 13 coordinated directly to a jack

  and indirectly to the other by means of the rocking lever.

  Finally, it should be noted that to prevent the operating lever from wobbling on its pivot 14, in the support 2 of the seat and the backrest can be provided guide portions 23 on one side and the other of the lever and the lever 13 can be oriented either to the right or to the left without losing the conditions for easy adaptation

  convenient conditions of use of the chair.

- 5 -

Claims (5)

  1.- Office chair of the seat and back type with adjustable position in which the seat is fixed to a support (2) associated with the rod of a pneumatic cylinder (4) for its positioning in height while the backrest is attached to an upright (7) pivotally mounted on the support (2) and itself under the action of a jack   tire (10) intended to stop the file in different   recents inclination conditions against the action of a spring (12), chair characterized in that it comprises a single operating lever (13) for acting directly on one of the pneumatic cylinders (4) and indirectly on the other (10) so as to selectively control the positioning in height and inclination of the seat and the backrest.   2. Chair according to claim 1, characterized in that the operating lever is pivotally mounted on the support (2) of the seat, in the transverse direction, so as to move and act as a lever of the first kind.   3. Chair according to one of claims 1 and 2,   characterized by the fact that the operating lever (13) has an intermediate part comprising a lower side (17) which is aligned with the pneumatic cylinder (4) associated with the support (2) of the seat and the backrest and acts on this cylinder and an upper side (18) for applying to a pivoting lever (20) pivotally mounted (21) on the support and provided with a beaked end (22) for acting on the pneumatic cylinder (10). ) associated with the amount folder.   4. Chair according to claim 1, characterized in that the operating lever is oriented transversely to the pneumatic cylinder (10) associated with the amount of the seat and has a hole in which passes   without contact the pneumatic cylinder ..   5. Chair according to claim 4, characterized in that on the support (2) of the seat and the backrest are formed guide portions of the operating lever, located on either side thereof. lever for prevent it from wobbling.