Coupling for a razor, comprising a first component, a second component rotatable relative thereto about a rotational axis extending therebetween, and a rotation limit, a male part thereof extending along the rotational axis into a female part thereof. The male and female parts are shaped to define one or more rotational stops to the rotation of one of the first and second components about the rotational axis relative to the other. A resilient protrusion of the second component, receivable in a recess of the first component, bends elastically in response to a force applied during shaving that rotates the one component about the rotational axis relative to the other component, and biases them towards a neutral position once the force is stopped. Fabrication of the coupling. Razor and handle comprising the coupling.

Proposed is an elastic body having variable rigidity, wherein the elastic body is used in a series elastic actuator module, connects an input and an output, and has a rigidity that varies according to the applied torque. The elastic body having variable rigidity comprises: a connection part which receives torque from the input side or the output side; and a spring part connected to and receiving torque from the one selected from among the input side and the output side which is different from the connection part, wherein the spring part is formed integrally with the connection part and has a rigidity that varies as the connection part and the spring part come into contact with each other due to deformation caused by the applied torque.

The refrigerator includes an ice maker; an ice bucket; a transfer member configured to transfer ice stored in the ice bucket; a drive motor unit configured to generate a driving force for driving the transfer member; a first coupler connected to the transfer member; and a second coupler separably coupled to the first coupler and coupled to the drive motor unit. The first coupler includes an insertion portion insertable into the second coupler, and a first inclined portion to guide the insertion portion to be inserted into the second coupler. The second coupler includes a seating portion to receive the first coupler, and a second inclined portion to guide the first coupler to the seating portion.

A constant velocity joint includes spherical rollers. At least parts of first inner bottom wall portions provided on an inner bottom wall surface of a cylindrical portion of the constant velocity joint are located in closer proximity to the side of an opening of the cylindrical portion than second inner bottom wall portions. When the spherical rollers are disposed at an innermost location inside the cylindrical portion and the axial directions of the spherical rollers are perpendicular to the axial direction of the cylindrical portion, at least parts of the first inner bottom wall portions abut against inner side outer circumferential surface portions of the spherical rollers, and the second inner bottom wall portions are separated away from outer side outer circumferential surface portions of the spherical rollers.

A constant velocity joint includes spherical rollers. At least parts of first inner bottom wall portions provided on an inner bottom wall surface of a cylindrical portion of the constant velocity joint are located in closer proximity to the side of an opening of the cylindrical portion than second inner bottom wall portions. When the spherical rollers are disposed at an innermost location inside the cylindrical portion and the axial directions of the spherical rollers are perpendicular to the axial direction of the cylindrical portion, at least parts of the first inner bottom wall portions abut against inner side outer circumferential surface portions of the spherical rollers, and the second inner bottom wall portions are separated away from outer side outer circumferential surface portions of the spherical rollers.

A connecting member of a universal connector includes a first insertion hole and a second insertion hole formed on from a first end surface toward a second end surface of the connecting member, and a third insertion hole and a fourth insertion hole formed on the second end surface toward the first end surface of the connecting member, whereby the insertion holes will not be affected by and damage other structures of the connecting member in the mechanical process, so as to achieve the enhancement of the convenience of processing.

A connecting member of a universal connector includes a first insertion hole and a second insertion hole formed on from a first end surface toward a second end surface of the connecting member, and a third insertion hole and a fourth insertion hole formed on the second end surface toward the first end surface of the connecting member, whereby the insertion holes will not be affected by and damage other structures of the connecting member in the mechanical process, so as to achieve the enhancement of the convenience of processing.

Proposed is an elastic body having variable rigidity, wherein the elastic body is used in a series elastic actuator module, connects an input and an output, and has a rigidity that varies according to the applied torque. The elastic body having variable rigidity comprises: a connection part which receives torque from the input side or the output side; and a spring part connected to and receiving torque from the one selected from among the input side and the output side which is different from the connection part, wherein the spring part is formed integrally with the connection part and has a rigidity that varies as the connection part and the spring part come into contact with each other due to deformation caused by the applied torque.

Proposed is an elastic body having variable rigidity, wherein the elastic body is used in a series elastic actuator module, connects an input and an output, and has a rigidity that varies according to the applied torque. The elastic body having variable rigidity comprises: a connection part which receives torque from the input side or the output side; and a spring part connected to and receiving torque from the one selected from among the input side and the output side which is different from the connection part, wherein the spring part is formed integrally with the connection part and has a rigidity that varies as the connection part and the spring part come into contact with each other due to deformation caused by the applied torque.

A phaser system is provided. The system includes a first gear connected to a first plate, and a second gear connected to a second plate. A phaser assembly includes at least one piston plate, and axial displacement of the at least one piston plate is configured to adjust a phase between the first gear and the second gear. A hydraulic fluid actuator assembly is also provided that includes a hydraulic fluid circuit including an advance chamber defined on a first side of the at least one piston plate and a retard chamber defined on a second side of the at least one piston plate. A valve selectively pressurizes the advance chamber or the retard chamber such that the at least one piston plate is axially displaced.