DE1114014B - Folding chair with a frame that forms the two front legs and accommodates the backrest - Google Patents

Description

Folding chair with one of the two front legs and the backrest receiving frame The invention relates to a folding chair, in particular on a folding chair that folds up automatically when it is lifted.

There are already the most diverse constructions of folding chairs known. In the first place, it remains highly desirable to construct a folding chair which can be folded up in the simplest way for transport and for use can be set up. Many known forms of folding chairs require installation either both hands or one hand and one foot, and in many examples fold unwanted on when wearing. Other constructions require installation additional handles.

There are also known folding chairs that have one of the two front legs have U-shaped bent frames forming and receiving the rear support surface, one rear leg can be swiveled and displaced on the longitudinal horns above the seat is arranged, with the rear part of the seat supported by the I-boning is and the middle seat part with the longitudinal bars pivoted on both sides is.

The invention has set itself the task of such a folding chair to create, which by means of a handle, only by lifting the backrest automatically unfolds and is ready to use by simply placing it on the floor. Here The perfect behavior of all construction parts during use is particularly important important. Many forms of the usual folding chairs have the disadvantage when handling that their structural parts generate pressure and crushing. Others of the known Folding chairs have protruding pins that slide along in rails or channels; often these rails or channels become dirty or other contaminants clogged so that the sliding parts do not work smoothly and satisfactorily. The invention is intended to avoid the disadvantages mentioned above.

It is also desirable to make the folding chairs as light as possible, but at the same time stable enough to ensure the safety of the user. In the folding chair according to the invention, the moving parts are therefore arranged so that the total weight of the chair is reduced to a minimum and yet there is still sufficient stability. The moving parts are so utilized that the chair in the known tubular frame construction automatically folds up as soon as it is raised, but immediately unfolds ready for use again when it is placed on the floor. According to the invention, each rear leg is slidably mounted on a rod guided in its upper, hollow end part, the upper cranked end of which is pivotably attached to the longitudinal spar of the frame that forms the two front legs and accommodates the back support surface fixed pivot bearing of the rear seat part rests. The upper, hollow ends of each rear leg and the rod guided therein, which is pivotably attached to the longitudinal horn, are dimensioned in their length so that these rods remain with their ends within the upper end of the hollow rear legs even when the chair is folded up. The articulated connection of the front legs, seat and rear legs and their weight- related design is such that when the chair is folded up when the main frame is lifted, the front end of the seat folds upwards and the rear legs lie against the frame of the front legs.

1 to 3 , an embodiment of the invention is described.

Fig. 1 shows the chair in the position of use in a perspective view; Fig. 2 is the side view of the chair of Fig. 1 and Fig. 3 shows the side view of the chair in the collapsed position.

The chair consists of a known tubular metal main frame 10 with the two front legs 12 which are connected by a cross brace 14 in the lower part of the same. In the upper part of the frame 10 , the tube is bent towards the backrest and the back support surface 16 is attached. Near the center point 18 of the frame 10 is the pivot point of the seat 20, which can be a conventionally covered tubular frame or the like. The part of the seat 20 facing the back of the chair is supported by the bearing 24 with the tubular rear legs. 22 overall an articulated connected. The rear legs 22 are connected below the seat surface 20 by a cross brace 26 . In order to ensure the correct position of the rear legs 22 in relation to the main frame 10 both in the unfolded and in the folded position, two rods 28 are used, which are articulated with their bent end part in the main frame 10 above the pivot point 18. The rods 28 are inserted into the tube ends of the rear legs 22, which are open at the top, and remain slidable in the rear legs 22.

When the chair is unfolded, the seat surface 20 rotates downwards in its front part and upwards in the rear. During this pivoting movement of the seat surface, the rear legs 22 swing out to the rear, and the extensions of the rods 28 slide into the rear legs 22. When the chair is fully opened, the rods 28 in the rear legs 22 abut against the bearing 24, but the upper ends of the rear legs 22 do not abut the joint 30 . When the chair is opened, there is no danger to the user due to the movable construction parts. As can be seen from the drawing of the folded chair (FIG. J), however, there is a possibility of pressing a finger on the rod 28, which rests on the main frame 10. However, this cannot be regarded as a significant disadvantage - since no larger weights or forces are effective on the folded chair.

In order to open the chair for use, the main frame 10 is raised at the top and in the direction of the backrest 16. When this is done, the weight of the rear legs 22 together with the rear seat surface 20 is greater than that of the front seat surface, and the rods 28 slide freely in the rear legs 22.

It should be noted that the rear legs are exactly behind the front legs, so that they can be one behind the other when the chair is folded and the seat 20 is not absolutely parallel to the main frame 10 when the chair is folded. The rods 28 also lie behind the corresponding parts of the main frame 10, to which they are pivotably connected by bends which engage in slots in the main frame 10. When the chair is folded, there is a small difference in length between the front and rear legs, so that the floor is first touched by the rear legs 22 when the chair is folded down. After another pressure from above, the seat is made to swing out so that the chair is in its fully opened, ready-to-use position. The front part of the seat does not protrude beyond the front legs and ensures perfect stability.

Claims (2)

PATENT CLAIMS: 1. Folding chair with a U-shaped curved frame that forms the two front legs and accommodates the rear support surface, on the longitudinal pegs of which a rear leg is pivotably and displaceably arranged, the rear part of the seat being supported by the rear legs and the middle seat part is pivotably connected to the longitudinal bars on both sides, characterized in that each rear leg (22) is arranged displaceably on a rod (28) guided in its upper, hollow end part, the upper bent end (30) of which is attached to the longitudinal horn (12) is pivotally fastened, while the lower end of the rod rests in the position of use of the chair on the fixed pivot bearing (24) of the rear seat part. 2. Folding chair according to claim 1, characterized in that in the folded position the rod (29) lies with its lower end within the upper end of the hollow rear leg (22). 3. Folding chair according to the claims! and 2, characterized in that in the folded position the seat surface (20) lies with its front end close to the back support surface (16), while the rear legs (22) rest against the rims (10) of the front legs (12). 4. Folding chair according to claim 1, characterized in that all the articulated connections (18, 24, 30) lie within the frame (10) or on the inside of the legs (22) and have no protruding approaches. Documents considered: French Patent No. 1075 559; USA. Patent Nos. 2,555,113, 2,568,269.