A parallel link robot includes: a base having two or more actuators; a movable part; two or more link parts connected to the actuators; an orientation changing mechanism that changes the orientation of an element attached to the movable part; two or more additional actuators that are provided on the two or more link parts and that change the orientation of the element with the same degree of freedom; and power transmission shafts. The link parts each have a driving link and two parallel driven links. The additional actuators are each disposed between the driven links of the two or more link parts. The power transmission shafts extend from the additional actuators along the driven links and are connected, with universal joints, to shafts extending from the orientation changing mechanism. The universal joints are located on a straight line connecting intersections between the two driven links and the movable part.

An actuator device includes a cartwheel flexure having a central moving carriage component configured for parallel motion along an axis of the actuator device. A frame is configured to remain stationary relative to the central moving carriage component. A plurality of cross-beams flexibly support the central moving carriage from the frame, wherein the plurality of cross-beams provide flexibility for movement of the central moving carriage relative to the frame along the axis and provide rigidity in other directions.

Disclosed herein are a sway-yaw motion device and a chair assembly with the same, which can provide an audience with various motion effects by moving a motion chair by various degrees of freedom. The sway-yaw motion device and the chair assembly can additionally provide various motions on the plane by adding a swaying motion, which is a linear motion on the plane, and a yawing motion, which is a rotary motion on the plane, to a pitching motion, a rolling motion and a heaving motion, which are provided generally. Particularly, the present invention relates to a sway-yaw motion device and a chair assembly with the same, which can provide swaying and yawing effects at the same time according to actuation of a driving part, for instance, according to an angle control of a crank arm, as well as provide the swaying motion and the yawing motion individually.

Disclosed herein are a sway-yaw motion device and a chair assembly with the same, which can provide an audience with various motion effects by moving a motion chair by various degrees of freedom. The sway-yaw motion device and the chair assembly can additionally provide various motions on the plane by adding a swaying motion, which is a linear motion on the plane, and a yawing motion, which is a rotary motion on the plane, to a pitching motion, a rolling motion and a heaving motion, which are provided generally. Particularly, the present invention relates to a sway-yaw motion device and a chair assembly with the same, which can provide swaying and yawing effects at the same time according to actuation of a driving part, for instance, according to an angle control of a crank arm, as well as provide the swaying motion and the yawing motion individually.

Aspects hereof relate to a stand-on terrain working vehicle having a foot-operated parking brake system. The parking brake system includes a pedal assembly having a first pedal and a second pedal, an actuator coupled to the pedal assembly, a brake configured to be actuated between a set/engaged state and a released/disengaged state, and an over-center linkage. When the first pedal of the pedal assembly is depressed, the brake is actuated to the set/engaged state, and when the second pedal of the pedal assembly is depressed, the brake is actuated to the released/disengaged state. The over-center linkage is configured to bias the brake towards one of the set/engaged state and the released/disengaged state.

Aspects hereof relate to a stand-on terrain working vehicle having a foot-operated parking brake system. The parking brake system includes a pedal assembly having a first pedal and a second pedal, an actuator coupled to the pedal assembly, a brake configured to be actuated between a set/engaged state and a released/disengaged state, and an over-center linkage. When the first pedal of the pedal assembly is depressed, the brake is actuated to the set/engaged state, and when the second pedal of the pedal assembly is depressed, the brake is actuated to the released/disengaged state. The over-center linkage is configured to bias the brake towards one of the set/engaged state and the released/disengaged state.

A work device includes a work device body and a contact preventer. The work device body includes a linear motion unit having three degrees of freedom and a rotary unit having three degrees of freedom. An end effector is mounted on an output portion of the rotary unit. The contact preventer separates a working region in which the work device body is installed, from a non-working region outside the working region. The contact preventer includes: an entry allowing portion allowing an object to enter the working region therethrough; and an entry allowing portion entry detection sensor configured to detect entry of an object into the working region through the entry allowing portions.

A headrest adjustment device includes a linear drive device, a linkage member and an adjustment assembly which includes a fixing member and a headrest bracket. The linkage member is fixed with the headrest bracket and provided with a buffer groove, and the linear drive device has an output rod for linear reciprocating motion. One end of the output rod is connected to one end of the buffer groove, and an angle is formed between the buffer groove and the output rod. The output rod pushes the linkage member to adjust the position and the angle of the headrest, or pulls back the linkage member to fold the headrest. When the headrest is folded, if the hand hinders the headrest movement, the linkage member will move in opposite directions, so that the headrest does not continue to lower which reduces the risk of one's hand injuries.

A headrest adjustment device includes a linear drive device, a linkage member and an adjustment assembly which includes a fixing member and a headrest bracket. The linkage member is fixed with the headrest bracket and provided with a buffer groove, and the linear drive device has an output rod for linear reciprocating motion. One end of the output rod is connected to one end of the buffer groove, and an angle is formed between the buffer groove and the output rod. The output rod pushes the linkage member to adjust the position and the angle of the headrest, or pulls back the linkage member to fold the headrest. When the headrest is folded, if the hand hinders the headrest movement, the linkage member will move in opposite directions, so that the headrest does not continue to lower which reduces the risk of one's hand injuries.

An adjustable diameter mechanism includes a plurality of cylinder portions, each of the cylinder portions comprising an arcuate portion of a cylinder and extending along an arc of less than or about 120 degrees of a 360 degree circle and having an inner side and an outer side. The inner side of the cylinder portions are coupled to first ends of a scissors mechanism at a pivot point and a slot of the cylinder portions, the scissors mechanism having a first and a second piece pivotally coupled at a pivot coupling, respective second ends of the scissors mechanism coupled to a respective pair of threaded bolts engaged with a screw having opposing threads meeting at a central point thereof.