초록 ▼

A chair including a seat assembly having depending leg members and a hollow support frame having at least two open ends terminating beneath the seat assembly and a pair of upstanding, spaced apart hollow frame members arranged to provide a backrest frame part for the chair having at least two open e

A chair including a seat assembly having depending leg members and a hollow support frame having at least two open ends terminating beneath the seat assembly and a pair of upstanding, spaced apart hollow frame members arranged to provide a backrest frame part for the chair having at least two open ends extending beneath the seat assembly and in registry with the ends of the support frame, and flexible spring members secured between each pair of members to provide an articulated, flexible spring backrest for the chair beneath the seat assembly. Each flexible spring member includes an elongated, flat or blade spring member having its opposite ends secured within a holder member which is closed at one end and open at its opposite end for inserting the spring into the holder. The open ends of each holder having stop flange formations protruding outwardly thereon which, when the holders are spaced apart at their open ends with a slight gap therebetween, effect limitation of the angle of flexure of the spring by engagement of the flanges one with the other. Each open end of the support frame can include hollow frame segments secured adjacent thereto for registry with complementary hollow frame segments secured adjacent the open ends of the backrest frame members which include like spring members secured therebetween where the segments and spring members are contained beneath the seat assembly.

대표청구항 ▼

A chair comprising, a seat assembly which includes depending leg members and a hollow support frame having at least two open ends terminating beneath said seat assembly, a backrest frame part having a pair of spaced apart hollow frame members upstanding relative to the seat support frame and having

A chair comprising, a seat assembly which includes depending leg members and a hollow support frame having at least two open ends terminating beneath said seat assembly, a backrest frame part having a pair of spaced apart hollow frame members upstanding relative to the seat support frame and having at least two open ends extending beneath said seat assembly and arranged in registry with the ends of the support frame, and spring means secured between each registered pair of frame members beneath said seat assembly to provide an articulated, flexible spring backrest for the chair, each spring means including a pair of elongate holder members of like, substantially U-shaped configuration closed at one end thereof and open at the opposite end thereof, one leg of each holder member being thicker and shorter than the opposing leg thereof and facing towards the rear of the chair, a substantially non-extensible flexible spring secured off-center in said holder members relative to the longitudinal center line of said holder members and adjacent said closed ends thereof and extending through said open ends thereof between the holder members, said open ends facing toward and spaced one from the other to form a gap therebetween, said holder members being installed inside said registered pair of frame members with the flexible spring extending therebetween, said holder members each having flange means integrally formed on said legs adjacent said open ends of the holders and protruding outwardly of the open extremities and into the spacing between the frame parts, said flange means constructed and arranged to limit angular movement of the upper backrest part in diametrically opposite directions by interengagement between protruding opposing flange means whereby to limit flexing of the spring beyond the tensile limit thereof.