A rotational coupler in one aspect of the present disclosure includes a plate-shaped first member, a plate-shaped second member, a tapered portion, and an outer circumferential ring. The outer circumferential ring includes a first ring flange configured to externally come into contact with the first member. The outer circumferential ring includes a bent portion in a middle part of the second ring flange in an extending direction. The bent portion is bent to protrude toward the first plate of the first member.

A rotatable connection for a stand apparatus to be arranged in an operating room and including an adaptable stop mechanism which can be arranged between a first connection component and a second connection component mounted rotatably around a rotational axis relative to the first connection component and is configured to define at least two different relative rotational angles of the connection components or at least two different rotational ranges is provided. A carrier system or a stand apparatus having such a rotatable connection is also provided.

An adjustment device for exercise apparatuses which comprises a flange, a coupling body coupled to the flange by a pressure bar, an adjustment protrusion and a pressure pin, a coupling ring through which the coupling body is passed, a vertical arm connected to the coupling body so as to be adjusted in the back and forth direction and rotationally, and a coupling arm connected to the vertical arm.

A positioning locking mechanism of a rotational member having a rotational positioning member provided with a positioning groove; a rotational member pivotally connected with the rotational positioning member and rotating around the rotational positioning member; a positioning member arranged in the rotational member and movably meshed with the positioning groove; and a locking operation member arranged in the rotational member to control the motion of the positioning member. The positioning locking mechanism can effectively ensure that the positioning and locking of the rotational member cannot be invalid due to accident collision or component fatigue.

A rotatable connection for a stand apparatus to be arranged in an operating room and including an adaptable stop mechanism which can be arranged between a first connection component and a second connection component mounted rotatably around a rotational axis relative to the first connection component and is configured to define at least two different relative rotational angles of the connection components or at least two different rotational ranges is provided. A carrier system or a stand apparatus having such a rotatable connection is also provided.

An articulating locking mechanism includes a support bracket with an upwardly opening receiving slot having an open top portion and closed bottom portion. A spring member is coupled to the support bracket at a mounting portion and includes a ramp portion disposed adjacent to the receiving slot. A pivot member includes a pivot bushing and a rotating mounting shaft extending outwardly from the pivot bushing. The pivot bushing is received in the receiving slot of the support bracket, and is retained by the ramp portion of the spring member when the pivot bushing is fully seated in the receiving slot of the support bracket.

A joint structure has a first main body, a positioning pin, a second main body, and a controlling button. The first main body forms with an annular wall and a limiting groove, and the annular wall forms an engaging passage. The positioning pin is mounted in the first main body. The second main body has a limiting protrusion and is rotatably mounted on the first main body; the limiting protrusion is mounted on the limiting groove. The controlling button is mounted on the second main body and forms a positioning groove and an engaging block corresponding to the engaging passage. The positioning pin can abut the positioning groove. With the cooperation of the positioning groove and the positioning pin, the joint structure can be folded or unfolded easily.

A snap-locking hinge joint includes a clevis member and a flange member. The clevis member has a clevis base from which extend a pair of parallel arms forming a gap therebetween. Each of the arms has a pivot side and an engagement face transversely opposite the pivot side, and each of the arms has a locking recess formed in the engagement face adjacent the clevis base. The flange member has a flange base from which extends a planar rib and a pair of locking fingers. The locking fingers each have an inwardly protruding locking tip. The rib is received in the gap of the clevis member. The arms are pivotally engaged with the rib thereby pivotally interconnecting the clevis and flange members. In a locked configuration, the locking tips of the locking fingers are captured in the locking recesses of the arms of the clevis member.

A joint structure has a first main body, a positioning pin, a second main body, and a controlling button. The first main body forms with an annular wall and a limiting groove, and the annular wall forms an engaging passage. The positioning pin is mounted in the first main body. The second main body has a limiting protrusion and is rotatably mounted on the first main body; the limiting protrusion is mounted on the limiting groove. The controlling button is mounted on the second main body and forms a positioning groove and an engaging block corresponding to the engaging passage. The positioning pin can abut the positioning groove. With the cooperation of the positioning groove and the positioning pin, the joint structure can be folded or unfolded easily.

An articulating locking mechanism includes a support bracket with an upwardly opening receiving slot having an open top portion and closed bottom portion. A spring member is coupled to the support bracket at a mounting portion and includes a ramp portion disposed adjacent to the receiving slot. A pivot member includes a pivot bushing and a rotating mounting shaft extending outwardly from the pivot bushing. The pivot busing is received in the receiving slot of the support bracket, and is retained by the ramp portion of the spring member when the pivot busing is fully seated in the receiving slot of the support bracket.