Self-locking crossing mechanism used for folding table and chair frames and folding bed frame

Abstract

The invention discloses a self-locking crossing mechanism used for folding table and chair frames and a folding bed frame. The self-locking crossing mechanism comprises a scissor type mechanism, two second connecting rods and two third connecting rods, wherein the scissor type mechanism comprises two first connecting rods; a first end of each second connecting rod is rotatably connected to one corresponding first connecting rod, each third connecting rod is rotatably connected to the corresponding second connecting rod, the third connecting rod is further rotatably connected with the other first connecting rod, and the scissor type mechanism, the two second connecting rods and the two third connecting rods are matched to form two groups of hinge four bar mechanisms symmetrically distributed. The self-locking crossing mechanism is provided with a limiting mechanism used for limiting the maximal unfolding angle, and the degree of the inclined angle having the opening facing downwards andformed by the two third connecting rods of the self-locking crossing mechanism at the maximal unfolding angle is greater than 180 degrees. The self-locking crossing mechanism has the advantage that the self-locking state of the mechanism can be maintained, so that the width and the height are fixed, thus a flexible cloth material achieves the tensioned state, the folding table and chair frames and the folding bed frame are stable, and can not topple over, the use is comfortable, the stress in the width direction is good, in addition, the structure is firm, and the manufacturing process is simple.

Description

technical field [0001] The invention relates to a mechanism for folding tables and chairs and a folding bed frame, in particular to a self-locking cross mechanism for folding tables, chairs frames and folding bed frames. Background technique [0002] Existing folding tables and chair frames and folding bed frames, such as the folding bed frame of CN102599755B, the folding table of CN2538201Y, and the folding chair of CN2441379Y, all include a scissor mechanism. Turn the two connecting rods that are connected together. It has the following disadvantages: 1. The foldable table and chair frame and the foldable bed frame limit the maximum unfolding angle through the fabric (bed fabric, chair fabric or tabletop fabric), and maintain the unfolded state, and the fabric is easily damaged; 2. Due to the user's activities, it is easy to cause changes in the elasticity of the fabric, which may loosen and collapse, making it uncomfortable to use; 3. The folding table and chair frame an...

AI Technical Summary

Problems solved by technology

It has the following disadvantages: 1. The foldable table and chair frame and the foldable bed frame limit the maximum unfolding angle through the fabric (bed fabric, chair fabric or tabletop fabric), and maintain the unfolded state, and the fabric is easily damaged; 2. Due to the user's activities, it is easy to cause changes in the elasticity of the fabric, which may loosen and collapse, making it uncomfortable to use; 3. The folding table and chair frame and the folding bed frame are prone to folding activities when they are unfolded, which is unstable and easy to shake at will. 4. Even if a manual safety lock is added to the folding table and chair frame and the folding bed frame, it will bring inconvenience to the use, and the user often will Forgetting to lock the safety lock, and forgetting to unlock the safety lock when folding, forcing the folding to cause damage to the folding table, chair frame and folding bed frame

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