Patent ID: 8776973

Claim:
A radial clutch device, comprising: an active rotary part ( 101 ); an annular passive rotary part ( 201 ) having at least one inner notch ( 202 ); a joint structure installed between the active rotary part ( 101 ) and the passive rotary part ( 201 ), and driven by the active rotary part ( 101 ), wherein the joint structure includes: an active arm ( 111 ) having a first end connected to the active rotary part ( 101 ) such that the active arm ( 111 ) rotates with the active rotary part ( 101 ); a compression arm ( 112 ); a joint axial core ( 113 ) pivotally connecting a second end of the active arm ( 111 ) and a first end of the compression arm ( 112 ); an outwardly expanding spring ( 114 ) installed between the active arm ( 111 ) and the compression arm ( 112 ), wherein the outwardly expanding spring ( 114 ) biases the compression arm ( 112 ) to bend in a direction that increases an angle between the active arm ( 111 ) and the compression arm ( 112 ) and causes a second end of the compression arm ( 112 ) to be displaced outwardly to engage the passive rotary part ( 201 ); one of a compression roller ( 118 ) and a compression head ( 117 ) installed on the second end of the compression arm ( 112 ), wherein: when the active rotary part ( 101 ) is driven by a rotational kinetic energy source in a first direction opposite to the direction in which the compression arm ( 112 ) is biased to bend, the compression roller ( 118 ) or compression head ( 117 ) is pressed outwardly and forced into the notch ( 202 ) so that the active rotary part transmits torque through the joint structure to drive the passive rotary part ( 201 ), and when the active rotary ( 101 ) is not driven by the rotational kinetic energy source and the passive rotary part ( 201 ) is driven in the first or second direction, the rotary compression roller ( 118 ) or compression head ( 117 ) moves out of the notch ( 202 ) along an extended inclined inner surface ( 203 ) of the passive rotary part ( 201 ), causing the joint structure to retract and the angle between the active arm ( 111 ) and passive arm ( 112 ) to decrease so that an idle sliding rotation state is formed between the passive rotary part ( 201 ) and the active rotary part ( 101 ).