A locking structure is applied to a folding frame. The folding frame includes a first frame and a second frame. The first frame includes a first hole. The second frame includes a second hole. The second frame can rotate relative to the first frame to fasten to the first frame. The locking structure includes a case, a first pivoting axis, a second pivoting axis, a fastening column, a connecting column and a third pivoting axis. The case includes a top, a bottom and a container. The first pivoting axis is pivotally connected to the bottom and the first hole. The second pivoting axis is pivotally connected to the second hole. The second pivoting axis includes a fastening groove. The fastening column is located in the container. The connecting column includes a connecting column first end and a connecting column second end.

Particular embodiments disclosed herein provide a joint of a tray arm assembly, comprising a joint body, a shaft configured to rotate relative to the joint body about a longitudinal axis of the shaft, and a slip clutch assembly, comprising a clutch stack, including a plurality of first clutch plates keyed to the shaft and a plurality of second clutch plates keyed to the joint body. The clutch stack further comprises a spring configured to selectively exert a force on the clutch stack, wherein the force compresses the clutch stack causing a friction between the plurality of first clutch plates and the plurality of second clutch plates with respect to a rotation of the shaft relative to the joint body.

Disclosed a connecting structure including a coating component provided with a storage cavity and a first through hole, an expansion component provided with a second through hole and a first fastener. A part of the expansion component is stored in the storage cavity; the expansion component has a rotary state and a fixed state relative to the coating component; when the expansion component is in the rotary state, the expansion component can be rotated relative to the coating component; the first fastener can pass through the first through hole and extend into the second through hole to make the expansion component expand; the outer surface of the expansion component is pressed against the inner surface of the coating component to fix the expansion component in the coating component; and the expansion component is in the fixed state relative to the coating component.

A joint device includes a base seat having a mounting hole with a tapered portion, and a rotating seat rotatably connected to the base seat. The tapered portion has large and small diameter ends. A shaft assembly includes a rotating shaft fixed to the rotating seat and inserted into the mounting hole, a one-way bearing sleeved on and frictionally engaged with the rotating shaft, and a tightening member press-fitted between an inner surface of the base seat and the one-way bearing. The tightening member has a C-shaped body with a gap that gradually reduces as the tightening member gradually moves from the large to the small diameter ends of the tapered portion.

A foldable clamp-on desk lamp with a multi-angle adjustment function includes: a lamp base part, a clamping base, several supporting rods, and detachable rotating shaft assemblies through which the several supporting rods are movably connected and the lamp base part is connected to the uppermost supporting rod. The lowermost supporting rod is detachably connected to the clamping base. The detachable rotating shaft assemblies can achieve folding and telescopic functions, complete disassembly, repeated disassembly, assembly and change, and long service life. By the design combining a Fresnel lens and convolutional lines, light is continuously scattered and recombined when passing through the convolutional lines, so that the outgoing light is more uniformly, soft, and not dazzling. A plurality of inserting holes are formed at the upper side and top end of the clamping base, thereby facilitating multi-directional assembling of the supporting rods and achieving wide application of the clamping position.

A connecting structure includes a coating component provided with a storage cavity and a first through hole, an expansion component provided with a second through hole and a first fastener. A part of the expansion component is stored in the storage cavity. The expansion component has a rotary state and a fixed state relative to the coating component. When the expansion component is in the rotary state, the expansion component can be rotated relative to the coating component. The first fastener can pass through the first through hole and extend into the second through hole to make the expansion component expand. The outer surface of the expansion component is pressed against the inner surface of the coating component to fix the expansion component in the coating component. The expansion component is in the fixed state relative to the coating component.

A joint device includes a rotating seat unit and a rotary shaft unit. The rotary shaft unit includes a fixed block defining a tightening hole, a rotary shaft fixed to the rotating seat unit and inserted into the tightening hole, and a tightening ring that is press-fitted into the tightening hole, that is frictionally engaged with the rotary shaft and that has large and small diameter ends. The rotary shaft is rotatable with the rotating seat unit relative to the fixed block. The tightening ring has a C-shaped body with a gap between two ends thereof. The gap of the tightening ring gradually reduces when it is gradually inserted from the large to the small diameter end of the tightening hole.

A joint device includes a base seat having a mounting hole with a tapered portion, and a rotating seat rotatably connected to the base seat. The tapered portion has large and small diameter ends. A shaft assembly includes a rotating shaft fixed to the rotating seat and inserted into the mounting hole, a one-way bearing sleeved on and frictionally engaged with the rotating shaft, and a tightening member press-fitted between an inner surface of the base seat and the one-way bearing. The tightening member has a C-shaped body with a gap that gradually reduces as the tightening member gradually moves from the large to the small diameter ends of the tapered portion.

A joint device includes a rotating seat unit and a rotary shaft unit. The rotary shaft unit includes a fixed block defining a tightening hole, a rotary shaft fixed to the rotating seat unit and inserted into the tightening hole, and a tightening ring that is press-fitted into the tightening hole, that is frictionally engaged with the rotary shaft and that has large and small diameter ends. The rotary shaft is rotatable with the rotating seat unit relative to the fixed block. The tightening ring has a C-shaped body with a gap between two ends thereof. The gap of the tightening ring gradually reduces when it is gradually inserted from the large to the small diameter end of the tightening hole.

A jointed member may include a first elongate section having a surface defining a first oblong opening, a second elongate section having a surface defining a second oblong opening, and a fastener passing through the first oblong opening and the second opening to connect the first elongate section and the second elongate section, where the first oblong opening and the second oblong opening move relative each other and the fastener as the jointed member transitions from a first predetermined state towards a second predetermined state.