Autonomous seat for chair

Claim 2

Seats intended for use on sundry supports comprising: a. a rigid frame having a back portion and a seat portion; b. said frame being made of a steel rod and defining a continuous closed outline having two lateral sides and two transverse sides, said sides being spread apart a constant and predetermined distance; c. a removable steel tube transversely fixed to the two lateral sides of said frame at the junction between said back portion and said seat portion, said steel tube stiffening said frame and maintaining said predetermined distance constant; d. covering means slid over said frame and means for securing said covering means over said frame, said covering means forming a rigid and nonextensible stretched body to receive the weight of a person, and e. wherein said covering means comprises: a first canvas covering which, upon being inserted beneath said removable tube, is pressed beneath said bar at the said junction formed by the back portion and the seat portion of said frame, said steel tube having both ends concave to follow the contour of said frame steel rod, said seats further comprising retaining means, made of weld spots, provided between the removable steel tube and the steel rod for firmly holding the steel tube in place.

Claim 3

A self-supporting seat for use on sundry supports and comprising: a. a rigid frame having a back portion and a seat portion; b. said frame being made of a single endless steel rod defining an uninterrupted closed outline having two lateral sides and two transverse sides, said transverse sides being held apart a predetermined distance; c. a removable steel tube extending transversally between said transverse sides at the junction between said seat and back portions to hold said transverse sides at said predetermined distance, the ends of said tube having a contour fitting over the wall of said steel rod on said transverse sides; d. means, on said transverse sides and at said junction, protruding inwardly of said frame and inside said tube ends across said contour to prevent slipping of said tube; e. an enveloping canvas covering having a front and a back ply and slipped tightly over said frame, said front ply being slit adjacent said lateral sides and inwardly of said frame at said junction to allow both plies to lie behind said transverse steel tube between said lateral sides; f. a filler mat of resilient material secured over said front ply of said canvas covering and over said transverse tube within the boundary of said frame, and g. a facing covering slipped tightly over said frame, canvas covering and resilient mat.

Claim 4

A self-supporting seat for use on sundry supports and comprising: a. a rigid frame having a back portion and a seat portion; b. said frame being made of a single endless steel rod defining an uninterrupted closed outline having two lateral sides and two transverse sides, said transverse sides being held apart a predetermined distance; c. a removable steel tube extending transversally between said transverse sides at the junction between said seat and back portions to hold said transverse sides at said predetermined distance, the ends of said tube having a contour fitting over the wall of said steel rod on said transverse sides; d. means, on said transverse sides and at said junction, protruding inwardly of said frame and inside said tube ends across said contour to prevent slipping of said tube; e. an enveloping canvas covering having a front and a back ply and slipped tightly over said frame, said front ply being slit adjacent said lateral sides and inwardly of said frame at said junction to allow both plies to lie behind said transverse steel tube between said lateral sides; f. a filler mat of resilient material secured over said front ply of said canvas covering and over said transverse tube within the boundary of said frame, and g. a facing covering slipped tightly over said frame, canvas covering and resilient mat.