TECHNICAL FIELD OF THE INVENTION

The present invention relates to the technical field of chairs as daily necessities, in particular to a portable foldable chair.

BACKGROUND OF THE INVENTION

Chair is a kind of furniture in daily life, and it is a kind of seat with a backrest. Existing chairs are bamboo chairs, wooden chairs, canvas chairs, steel-wood hybrid chairs, etc. Canvas chairs are generally foldable chairs, with the advantages of being light in weight, low in cost, easy to carry around, and popular with travel enthusiasts. Generally, some of canvas chair seats of the existing canvas chairs are integrally sleeved on rear support tubes, while some are mounted in the rear support tubes through some buckles or complicated structures. For ease of use, chairs are not only seats, but should also be endowed with more functions to make human beings more convenient.

Upon inquiry, a Chinese patent CN203378781U (Patent No.: 201320474349.X), titled Ultra-Light Folding Chair, mainly solves the problems that the existing reclining chairs are inconvenient to carry around and difficult to be transported over long distances. It comprises a pair of connecting and mounting blocks, first elastic straps on which top tubes are sleeved are provided between the connecting and mounting blocks, second elastic straps, through which the connecting and mounting blocks are connected to front leg tubes, rear leg tubes, front support tubes and rear support tubes, are provided in the connecting and mounting blocks, and the front and rear leg tubes and the front and rear support tubes are sleeved in the connecting and mounting blocks. The front and rear leg tubes and the front and rear support tubes of the ultra-light folding chair can be disassembled and folded, and then put into a bag, so such chair is easy to carry around and can be transported over long distances, especially suitable for some outdoor enthusiasts. Similar structures can also be found in Chinese patents CN205197528U (Patent No.: 201520878839.5) and CN209769712U (Patent No.: 201920155438.5), which are defective in not making full use of some outdoor sports equipment to fully reduce weight and cost, so there is room for further optimization of design.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a foldable chair, which makes reasonable use of outdoor equipment, i.e., poles reasonably, so as to make the foldable chair structure more reasonable and simple, quick and easy to install and disassemble, and very easy to carry around.

For achieving the above object, the foldable chair comprising a foldable chair frame and a chair seat made of a flexible material; the chair frame comprising an X-shaped left support frame, an X-shaped right support frame and a connecting crossbar with two ends connecting the left support frame and the right support frame, the chair seat having a top edge, a bottom edge, and a backside, the chair seat connecting to the chair frame through a plurality of connecting pieces disposed on the top and bottom edges of the backside of the chair seat; wherein, each of the left support frame and the right support frame has a detachable pole extending from top to bottom of the chair frame, and the connecting crossbar has two first through holes for the poles to pass through, each of the left support frame and the right support frame has a support tube extending from the bottom edge of the chair seat to the bottom of the chair frame, and correspondingly, the connecting crossbar has two second through holes for the support tubes to pass through, and each pole and the corresponding support tube forms the X-shaped left or right support frame.

Preferably, each support tube further comprises an upper support tube and a lower support tube both are detachably connected to the second through holes of the connecting crossbar.

Preferably, the connecting crossbar, the upper support tubes and the lower support tubes are made from metal tube; each first through holes is located at the end of the connecting crossbar, the middle lower portion of each pole is located inside the corresponding first through hole; each second through hole is radially across at the end of the connecting crossbar, a first elastic rope runs through each upper support tube and the corresponding lower support tube to pull an upper support tube toward the corresponding lower support tube to form the X-shaped left or right support frame with the corresponding respective poles.

Preferably, the outer diameters of each upper support tube and each lower support tube are both greater than the diameter of the each second through hole of the connecting crossbar; the lower support tube has a smaller section at the top end of the lower support tube inserting inside the second through hole, the inner diameter of the upper support tube is adapt to the smaller section for receiving the smaller section of the lower support tube, the top end of the lower support tube is inserted into the lower end of the upper support tube after the smaller section runs through the second through hole.

Preferably, each second through hole is located outer side of the adjacent first through holes on the connecting crossbar; the first elastic rope has two ends, one end of the first elastic rope is connected to the upper support tube, and the other end of the first elastic rope runs through the corresponding second through hole and is connected to the lower support tube.

Preferably, the connecting crossbar has two hollow sleeves inserted in the connecting crossbar, and the hollow sleeves forms the second through holes.

Preferably, the connecting crossbar comprises a left connecting crossbar and a right connecting crossbar detachably connected with each other, and a second elastic rope attaches the left connecting crossbar to the right connecting crossbar.

Preferably, the second through holes and the first through holes are distributed inclined in X shape.

Preferably, the two poles have same structure with an adjustable pole height, and the left support frame and the right support frame are symmetrical located at left and right of the chair frame.

Preferably, the pole comprises an upper pole body and a lower pole body detachably connected to each other; a hand grip portion is disposed at an upper end of the upper pole body, a leg portion is connected to a lower end of the lower pole body; the upper pole body and the lower pole body are detachably connected through a locking sleeve, the lower pole body is inserted into the leg portion and then fixed by a locking sleeve, and the outer end of the connecting crossbar is sleeved on the lower pole body and disposed above the locking sleeve.

Preferably, a socket is disposed at the middle lower portion of the pole, and a fixed pin is inserted into and connected to the socket to position and fixedly connect the connecting crossbar.

Preferably, a plurality of connecting sleeves at the back of the chair seat are made of a flexible material; the two connecting sleeves at the upper end are respectively fitted and inserted into the hand grip portions of the two poles, and the two connecting sleeves at the lower end are respectively fitted and inserted into the upper ends of the left and right upper support tubes.

Compared with the prior art, the present invention has the following advantages. The chair frame takes two poles as the main body and is combined with two sets of support frames consisting of the connecting crossbar and the upper and lower support tubes, so that the chair is easy for installation and disassembly, and the poles may be used as the support frame of the chair while being used for mountaineering. The height of the chair back may be adjusted by adjusting the height of the pole body of the pole, so the chair is suitable for people of different heights, is easy to store and carry around, and reduces weight and cost. Since the chair seat is made of a flexible material, the chair is light in weight, small in size and low in cost. The present invention has the advantages of simple and reasonable structure, easy installation and disassembly, simple manufacture process and low cost, and is especially suitable for carrying around when traveling.

