Abstract: An anti-wobbling adjustable height stool includes an adjusting screw vaving a threaded seat support spindle and a top spindle head and a stool seat assembly. The stool seat assembly includes a stool seat, and a connecting frame connected with a bottom of the stool seat. The connecting frame is opened with an installation hole, and the spindle head penetrating through and being arranged in the installation hole to enable a tight fit of the spindle head with the connecting frame.

Abstract: An anti-wobbling adjustable height stool includes an adjusting screw vaving a threaded seat support spindle and a top spindle head and a stool seat assembly. The stool seat assembly includes a stool seat, and a connecting frame connected with a bottom of the stool seat. The connecting frame is opened with an installation hole, and the spindle head penetrating through and being arranged in the installation hole to enable a tight fit of the spindle head with the connecting frame.

Abstract: A movable vehicle capable of carrying stackable chairs comprises a base frame, a roller connected to the base frame for carrying the base frame, and a supporting frame disposed in the base frame. The supporting frame has a V-shape support with an upward opening. Advantages include adjustability of the supporting frame for placing and moving the stackable chair, and the V-shape of the supporting frame can either be an upward convex column, or an upward board, so as to carry different stackable chairs.

Abstract: A folding chair comprises two front tubular legs, two rear tubular legs and a seat cushion board, with the front tubular legs intersecting the rear tubular legs. Two washers are arranged at an intersection of the front and rear tubular legs, such that each washer is located between a front tubular leg and a rear tubular leg. A pin passes through the front tubular leg, the washer and the rear tubular leg successively. The washer includes a curved base and a bowl-shaped support which is located in a central area of the curved base, and a through hole is formed at the center of the bowl-shaped support. The curved base is fixedly connected to the front tubular legs.

Abstract: A folding chair comprises two front tubular legs, two rear tubular legs and a seat cushion board, with the front tubular legs intersecting the rear tubular legs. Two washers are arranged at an intersection of the front and rear tubular legs, such that each washer is located between a front tubular leg and a rear tubular leg. A pin passes through the front tubular leg, the washer and the rear tubular leg successively. The washer includes a curved base and a bowl-shaped support which is located in a central area of the curved base, and a through hole is formed at the center of the bowl-shaped support. The curved base is fixedly connected to the front tubular legs.

Abstract: A movable vehicle capable of carrying stackable chairs comprises a base frame, a roller connected to the base frame for carrying the base frame, and a supporting frame disposed in the base frame. The supporting frame has a V-shape support with an upward opening. Advantages include adjustability of the supporting frame for placing and moving the stackable chair, and the V-shape of the supporting frame can either be an upward convex column, or an upward board, so as to carry different stackable chairs.