An apparatus includes an upper member, a lower member disposed beneath the upper member, and a spring disposed between the upper member and the lower member. The upper member has a pin extending downward therefrom. The lower member has a seat configured to receive a free end of the pin. The spring surrounds the pin, and has a free length that is less than the length of the pin. In an unloaded state, the free end of the pin contacts the seat and the spring applies a compressive force to prevent relative lateral movement between the upper member and the lower member. When the lower member carries a load in a loaded state, the load applies a tensile force to the spring that forms a gap between the free end of the pin and the seat, which allows relative lateral movement between the upper member and the lower member.

An apparatus includes an upper member, a lower member disposed beneath the upper member, and a spring disposed between the upper member and the lower member. The upper member has a pin extending downward therefrom. The lower member has a seat configured to receive a free end of the pin. The spring surrounds the pin, and has a free length that is less than the length of the pin. In an unloaded state, the free end of the pin contacts the seat and the spring applies a compressive force to prevent relative lateral movement between the upper member and the lower member. When the lower member carries a load in a loaded state, the load applies a tensile force to the spring that forms a gap between the free end of the pin and the seat, which allows relative lateral movement between the upper member and the lower member.

A fixing structure includes a housing including a first hole, an input member including a second hole, and rotating relative to the housing, depending on input of rotational force, a torsion spring being biased so as to return, to a predetermined reference position, a position of the input member relative to the housing, and a fixing member inserted into the first hole and the second hole in a state where the input member is rotated against biasing force of the torsion spring from the reference position to a predetermined rotational position. The fixing member includes a first insertion portion including a part press-fitted into and fixed to the first hole, and a second insertion portion including a part inserted into the second hole, and fixes the input member at the predetermined rotational position.

A fixing structure includes a housing including a first hole, an input member including a second hole, and rotating relative to the housing, depending on input of rotational force, a torsion spring being biased so as to return, to a predetermined reference position, a position of the input member relative to the housing, and a fixing member inserted into the first hole and the second hole in a state where the input member is rotated against biasing force of the torsion spring from the reference position to a predetermined rotational position. The fixing member includes a first insertion portion including a part press-fitted into and fixed to the first hole, and a second insertion portion including a part inserted into the second hole, and fixes the input member at the predetermined rotational position.

A torque balancing device, a self-balancing joint and a surgical robot are provided. The torque balancing device includes a first body, a second body, an elastic part and a transmission part, the first body includes a first connection end and a first opposite end opposite to the first connection end, the second body includes a second connection end and a second opposite end opposite to the second connection end, the second connection end of the second body is rotatably connected to the first connection end of the first body, the elastic part is provided in the first body, and the transmission part is connected to the second body and the elastic part.

A coil spring device includes: a main body spring and an insulator, the insulator is provided with a support groove which extends around a coil axis and into which a lower end portion of the main body spring is fitted, the lower end portion of the main body spring adheres to an inner surface of the support groove, the inner surface of the support groove is provided with a plurality of spacer protrusions which support an outer peripheral surface of a wire rod, a plurality of adjacent spacer protrusions adjacent to an open end edge of the support groove of the plurality of spacer protrusions each includes a pair of side wall surfaces extending toward the open end edge and are provided at intervals therebetween in an extension direction of the open end edge in a plan view of a part including the open end edge in the inner surface of the support groove, and inclination angles of the side wall surfaces adjacent to each other in the extension direction with the interval therebetween with respect to an orthogonal direction orthogonal to the open end edge are different from each other in the plan view.

A coil spring device includes: a main body spring and an insulator, the insulator is provided with a support groove which extends around a coil axis and into which a lower end portion of the main body spring is fitted, the lower end portion of the main body spring adheres to an inner surface of the support groove, the inner surface of the support groove is provided with a plurality of spacer protrusions which support an outer peripheral surface of a wire rod, a plurality of adjacent spacer protrusions adjacent to an open end edge of the support groove of the plurality of spacer protrusions each includes a pair of side wall surfaces extending toward the open end edge and are provided at intervals therebetween in an extension direction of the open end edge in a plan view of a part including the open end edge in the inner surface of the support groove, and inclination angles of the side wall surfaces adjacent to each other in the extension direction with the interval therebetween with respect to an orthogonal direction orthogonal to the open end edge are different from each other in the plan view.

A vibration-proof mount which is interposed between a vibration device including a vibration source and an elastic member disposed on a foundation surface includes an upper base plate including a first mounting portion where the vibration device is mounted, a lower base pate arranged below the upper base plate and supporting the upper base plate, and a plurality of connecting members connecting the upper base plate and the lower base plate, the plurality of connecting members including at least two or more first connecting members disposed between the first mounting portion and the lower base plate at intervals from one another. The first mounting portion is configured to have higher rigidity than the lower base plate.

A vibration-proof mount which is interposed between a vibration device including a vibration source and an elastic member disposed on a foundation surface includes an upper base plate including a first mounting portion where the vibration device is mounted, a lower base pate arranged below the upper base plate and supporting the upper base plate, and a plurality of connecting members connecting the upper base plate and the lower base plate, the plurality of connecting members including at least two or more first connecting members disposed between the first mounting portion and the lower base plate at intervals from one another. The first mounting portion is configured to have higher rigidity than the lower base plate.

Vibratory screens and apparatus therefore are disclosed. In some embodiments, a damper is incorporated having a pin and pivot arm which cooperate to dampen high-amplitude vibratory motion of the screen. In some embodiments, a bumper is disposed transversely adjacent to a sidewall of the screen and mounted to a bracket supporting a damper. In some embodiments, one or more guards protect openings in a pivot arm of the damper.