FR2623702A1 - SEAT OSSATURE STRUCTURE - Google Patents

Abstract

According to the invention, it comprises a rectangularly extending tube 1, having opposite side portions 1a, 1b, two flanged tabs 2A, 2B, each of which has a major part and a recessed part of the rim, the major part having a elongated cutout 3 which extends from the recessed part and a connection means 6 connecting the major part of each tab to the lower part of the corresponding lateral portion of the tube so that the elongated cutout extends along the longitudinal axis of the corresponding lateral portion, a limiting portion of each tab 2A, 2B by which the elongated cutout is defined being welded to the upper part of the corresponding lateral portion of the tube over its entire length. The invention applies in particular to the automotive industry.

Description

The present invention generally relates to a seat and more

  particularly to a seat frame structure. In order to clarify the task of the present invention, a conventional framework structure for a seat will be

  described with reference to FIG.

  The drawing shows a frame structure for a seat portion of an automobile seat. The frame structure comprises a rectangularly extending tube 1 which has opposing side portions 1a and 1b. In order to

  connect the frame structure to another bone structure

  is saturated, not shown, for a seat cushion portion, tabs 2A and 2B are employed, each of which is in the form of a flanged panel. The rim of each panel has, at an upper part, a recess 4 for receiving part of the corresponding lateral portion 1a or 1b of the tube 1. Each lateral portion 1a or 1b of the tube 1 is fixed to

  rivets 6 to a major part of the corresponding lug.

  dante 2A or 2B. The recessed portion of the flange of each leg 2A or 2B is welded to the tube 1. More particularly, as indicated by the arrow "W", the welding is done so as to extend over half of the circumference of the

corresponding part of the tube 1.

  However, the framework structure of this type pre-

  -25 feels the disadvantage that follows, due to its inherent construction.

  Indeed, the bending stiffness of the welded portions of the tube 1 is considerably reduced by the heat

  applied when the welding is carried out in the manner

  above. Thus, when, in the case of a collision of the vehicle,

  or the like, a certain charge is suddenly applied.

  At an upper part of the tube 1 in the direction of the arrow "X", it happens that the tube 1 bends to the welded portions. The present invention therefore relates to a frame structure free from the drawback mentioned above.

  According to the invention, a bone structure is provided.

  saturates o the weld between the frame tube and the leg is made to extend over the longitudinal extent

of the tube.

  According to the present invention, there is provided a seat frame structure, which comprises a rectangularly extending tube having opposite side portions, each side portion having upper and lower portions; a pair of flanged tabs, each comprising a major portion and a recessed portion of the flange, the major portion having an elongated cutout extending from the recessed portion; and a connection means connecting the major part of each

  leg at the lower part of the lateral portion corresponding to

  of the tube so that the elongate cut extends

  along the longitudinal axis of the lateral portion corresponding to

  a limit part of each leg by which

  the elongated cut is defined is welded to the upper part

  of the corresponding lateral portion of the tube, on

all its length.

  The invention will be better understood, and other purposes,

  characteristics, details and advantages of it appear

  more clearly in the explanatory description

  which will follow with reference to the accompanying schematic drawings given solely by way of example illustrating an embodiment of the invention, and in which: - Figure 1 is a perspective view of a conventional framework structure for a car seat back; FIG. 2 is a view similar to FIG.

  but showing a framework structure of the present invention

  tion; FIG. 3 is an enlarged view of the part surrounded by a circle indicated by the arrow III in FIG. 2; and - Figure 4 is a sectional view made according to the

line IV-IV of Figure 3.

  Referring to FIGS. 2 to 4, and in particular to FIG. 2, it shows a framework structure according to FIG.

present invention.

  As the general construction of the invention is substantially the same as the conventional construction mentioned above, only the parts and construction which differ from those of the conventional construction will be described in the following. The same parts are designated

  by the same reference numbers.

  As can clearly be seen in FIG. 3, each tab 2A or 28 has a shallow and rounded groove 7 which extends downwardly from the recess 4 and clearly receives the corresponding lateral portion of the tube 1. The lug 2A or 2B further has, at the upper part of the groove 7, a cutout 3 extending downwards. It should be noted that, as can be seen better in FIG. 3, the cutout 3 extends substantially along the axis of the portion

corresponding side of the tube 1.

  In the present invention, only the disembossed portion 3 is welded to the corresponding lateral portion of the tube 1. More particularly, as can be understood in FIG. 3, only a limit portion of each lug 2A or 2B through which the elongate cut 3 is defined is

  welded to the upper part of the lateral portion corresponding to

  laying the tube 1 or 1, along its entire length. In other words, in the present invention, the welded portion of the lateral portion 1a or 1b of the tube 1 extends along

  its axis, and not in the circumferential direction.

  According to the present invention, the bending stiffness of the welded portions of the tube 1 is not so much

  decreased because the heat for heating is not

  only to a limited part, extending longitudinally,

of the tube 1.

26237O2

R E V E ND I C A T IONS

  A frame structure of a seat characterized in that it comprises: a rectangularly extending tube (1) having opposite side portions (1a, 1b), each side portion having upper and lower portions; two flanged tabs (2A, 2B), each having a major portion and a recessed portion of the flange, said major portion having an elongated cutout extending from said recessed portion; and connecting means (6) connecting the major portion of each tab to the lower portion of the corresponding lateral portion of the tube so that the elongate cut extends along the longitudinal axis of the corresponding lateral portion, limit portion of each leg (2A, 2B) through which the elongated cutout (3) is defined is welded to the upper part of the corresponding lateral portion of the

tube, over its entire length.

  2. Structure according to claim 1, characterized

  in that the major part of each leg has a groove

  rounded and shallow geometry (7) in which is clearly

  received the lower part of the lateral portion correspon-

te of the tube.

  3. Structure according to claim 2, characterized in that the connection means comprises a number of

rivets (6).

  4. Structure according to claim 3, characterized in that the edge of each leg (2A, 2B) extends around the perimeter of the corresponding major part with the exception of

the hollow part.