FR2842403A1 - Rocking chair is supported by vertical post mounted on rocker feet, components of chair frame being flexible enough to adjust point of projection of center of gravity on ground so that it remains behind rocking axis - Google Patents

Abstract

The rocking chair is supported by a single vertical post mounted on rocker feet. The components (1, 2, 3, 9) of the chair frame are flexible enough to adjust the point of projection (30) of the center of gravity on the ground so that it remains behind the rocking axis.

Description

The present invention relates to a weight adjustment device

  automatic on a dynamic rocking seat composed of a flexible chassis, provided with a continuous seat adjustment to adapt to the size of the user, which can be used in the seated or

sit-stand position.

  Previously the seats with adjustable elements were provided with a frame with a notched system with defined height spaced a few centimeters, constraining

  the user to choose adjustment heights predetermined by the designer.

  On the other hand, some seat models fitted with precise adjustments (with height adjustment with pneumatic cylinder, for example), did not have all of the additional elements such as

  as neck rest, armrest, lumbar support and foot rest.

  Other seats fitted with this modular system of elements did not have a tilt system. The rocking seats were not equipped with a weight adjustment device.

the wearer / user.

  The sit-stand position is a mode of sitting or the body weight is distributed simultaneously on the buttocks and feet. This position is recommended for people suffering from back problems or preventively as well as frequent posture changes

  seat to maintain mobility and muscle tone in the lumbar region of the back.

  The rocking seat to move from a seated position to a sit-stand position by

  simple movement of the body, provides a seating solution respecting physiology.

  The present invention relates to a rocking seat usable in sit-stand position. It is composed of a flexible chassis and a continuously adjustable seat, The flexion of the elements is designed to obtain a dynamic return movement of the rocker of the rear tilt movement. The amplitude of the flexion of the chassis elements is proportional to the weight of the user's body, which has the effect of adjusting the projection on the ground of its center of gravity, behind the front tipping point of the seat, considering that the weight of an individual is proportional to its volume. This automatic adjustment allows each user to have a minimum of effort to get from the sitting position

in the sit-stand position.

  The seat includes a means of continuous height adjustment by pinching along the frame to adapt to the size of the user. The ancillary elements (neck rest, armrest, lumbar support, foot rest) are articulated on the chassis with the same

adjustment device.

  The base is curved in its front part to switch from the sitting position to the sit-stand position. The accompanying drawings illustrate the invention:

  Figure 1 / illustrates the profile view of the seat.

  Figure 2 / illustrates a side view of the loaded seat.

  Figure 3. illustrates a side view of the seat adjuster.

  Figure 4 illustrates a vertical view of the chassis.

  FIG. 5 illustrates a vertical view of the articulation of the seat on the chassis FIG. 6 illustrates a perspective view of the seat The chassis is composed of: * 2 parallel cylindrical bars (2) and (2 ') almost vertical and integral at their base by a fixed junction (27) * 2 elements (3) and (9) in continuity with the bars (2) and (2 ') * 2 base elements (1) and (1') supported on the ground and in continuity with (3) and (9) * 2 elements (11) and (11 ') in continuity with the base elements (1) and (1') bent in height

a few degrees.

  When the user sits down, or when an equivalent weight (33) is placed on the seat (4), the bars (2) and (2 ') tilt back, and the elements (3) and (9) flex simultaneously as they approach the ground This angle of inclination increases proportionally with the weight of the user! user, which has the effect of maintaining the point of projection on the ground of the center of gravity of the whole (seat + user /

  user); (30) behind the tilt axis (29).

  The bending back of the bars (2) and (2 '), by tilting back provides cushioning

  and a dynamic return effect to the initial position.

  By way of nonlimiting example, the solid or hollow bars will have an outside diameter of

12à20mm.

  The center distance (28) will be of sufficient size to limit the rotation of the seat around the axes (21) and (22). By way of nonlimiting example, the bars (2) and (2 ') are inclined from 6 to 8

  from the vertical when the seat is not stressed by a pressure on the seat (4).

  The flexibility of elements (3) and (9) allows 4 functions 1. Dampening the user weight overload when he / she sits

  2. Damper the anteroposterior movements of inclination of the bars (2) and (2 ').

  3. Stop the posterior tilting movement of the elements (2) and (2 '). When the

  stop points (10) and (14) come into contact with the ground.

  4. Simultaneously adjust with the bending of the bars (2) and (2 ') the projection on the ground of the center of gravity of the seat + user / user (30) assembly, behind the axis

  imaginary rocker (29)., defined by points (12) and (23).

  The base is supported on the ground by the flexible elements (1) and (1 '), when the user is in a seated position. When the user reclines the bars (2) and (2'), this force is transmitted to the elements (3) and (9) which, when approaching the ground in their posterior part, bends the elements (1) and (1 ') which are lifted from the ground in their part

  prior to the vicinity of points (14) and (20).

  The base is supported on the ground by the elements (11) and (11 '), when the user

is in a sit-stand position.

  The transfer of support from one position to another takes place in rotation around the axis (29) With

  a minimum of effort provided by the user.

  According to particular embodiments, the elements (1), (3), (2) and (11) will be the parts of a single bar or bent tube symmetrical on a plane transverse to another bar

  or bent tube consisting of the elements (1 '), (9), (2') and (1 ') connected by the junction (27).

  The seat support (4) is fixed to two twin cylindrical guides (8). A diametral clearance

  is provided so that the guides (8) can slide on the bars (2) and (2 ').

  According to particular embodiments, the guides will have, in section, a quadrilateral shape. By way of nonlimiting example, the fixed junction of the rear part of the seat (4) at

  guide (8) will vary horizontally from 0 to 6 degrees.

  To ensure their dual function, the guides (8) will evolve between 2 situations with respect to the frame: 1. Position 1: When the user exerts vertical pressure on the junction of the guides (25), the longitudinal axes of the guides ( 16) and (17) are superimposed with the axes of the elements of the frame (2), the guides can thus slide without effort to

  select the desired seat height (4).

  2. Position 2: The weight of the seat (4), with or without user, exerts a force

  antagonist in the direction of the sliding of the guides on the frame.

  The axes of the guides (16) and (17) separate from the axes of the cylindrical elements (21) and (22) of the frame and form an acute angle. The upper / rear (19) points, on the one hand, and the interior / front (20) points of the guide (8) come to bear on the elements of the frame,

according to fig. 3/5.

  This pinching effect of the guides (8) on the bars (2) and (2 ') ensures the function

  self-locking of the seat on the support.

  This pinching effect is reinforced by the weight of the user.

  The other elements of the seat are articulated to the frame according to the same principle as the seat, either: * neck rest (13) * armrest (7) has lumbar support (6) a Footrest (5) According to particular embodiments , the neck rest will slide using two guides (34) and (35) converging slightly in their upper part to exert friction in contact with the bars (2) and (2 ') so that the neck rest (13) remains at the selected height. A variant of the invention consists in using a chassis consisting of one or two bars of

quadrilateral section.

  The device according to the invention is intended for children as for adults for uses

  multiple, office, home, behind a counter, a bank.

> +2842403

Claims (4)

claims   1. Automatic adjustment device for positioning the body of a user on a dynamic rocking seat, characterized in that the elements of the chassis (1), (1 ') (3) (9) (2) and (2 ') have a flexibility whose range of motion is proportional to the weight exerted on the seat (4), to adjust the projection point   on the ground of the center of gravity (30), behind the tilt axis (29).   2. Device according to claim 1 characterized in that the seat abuts on the ground on the elements (11) and (1 l ') by pivoting about the axis (29), when the point of   projection on the ground of the center of gravity comes in front of point (30).   3. Device according to any one of the preceding claims, characterized in that   that the mounting of the seat - (4) on the chassis consists of twin guides (8) sliding on two cylindrical bars (2) and (2 '), the guides having a bore greater than the diameter of the bars (2) and (2 ') ensuring a blocking play and thus coming   pinch the tube by the simple weight of the seat.   4. Device according to claim 3, characterized in that the ancillary elements of the seat Neckrest (13), armrest (7), lumbar support (6), footrest (5) are articulated   to the bars (2) and (2 ') according to the same principle as the seat (4).