According to an embodiment, a driving apparatus includes a housing, a first driving body in the housing to be rotatable around a first central axis, an eccentric driving body provided in the first driving body to be rotatable around a second central axis parallel to the first central axis, a first pivot provided at one axial end of the eccentric driving body and eccentrically to the second central axis, a second pivot provided at another axial end of the eccentric driving body and eccentrically to the second central axis, a first moving body rotatably coupled to the first pivot and linearly movable along a third central axis, a first guide body which guides movement of the first moving body, and a second guide body which guides the second pivot to be movable in a first direction.

According to an embodiment, a driving apparatus includes a housing, a first driving body in the housing to be rotatable around a first central axis, an eccentric driving body provided in the first driving body to be rotatable around a second central axis parallel to the first central axis, a first pivot provided at one axial end of the eccentric driving body and eccentrically to the second central axis, a second pivot provided at another axial end of the eccentric driving body and eccentrically to the second central axis, a first moving body rotatably coupled to the first pivot and linearly movable along a third central axis, a first guide body which guides movement of the first moving body, and a second guide body which guides the second pivot to be movable in a first direction.

The subject matter of this specification can be embodied in, among other things, a linear-to-rotary apparatus that includes a linear actuator having an actuator housing including a piston chamber, a piston shaft disposed in the piston chamber, and a rotor apparatus. The rotor apparatus includes a rotary joint defining a rotational axis, a rotor arm extending radially from the rotary joint and configured to at least partially pivot about the rotary joint, and a torque linkage pivotably connected to the rotor arm. The torque linkage is also attached to an end of the piston shaft of the piston at a pivot connection joint, where the pivot connection joint defines a pivot axis that is substantially perpendicular to the translation axis of the piston shaft.

The subject matter of this specification can be embodied in, among other things, a linear-to-rotary apparatus that includes a linear actuator having an actuator housing including a piston chamber, a piston shaft disposed in the piston chamber, and a rotor apparatus. The rotor apparatus includes a rotary joint defining a rotational axis, a rotor arm extending radially from the rotary joint and configured to at least partially pivot about the rotary joint, and a torque linkage pivotably connected to the rotor arm. The torque linkage is also attached to an end of the piston shaft of the piston at a pivot connection joint, where the pivot connection joint defines a pivot axis that is substantially perpendicular to the translation axis of the piston shaft.

A heat engine includes a system for varying compression ratio, which comprises a crankshaft including at least a crank pin and an arm, and an eccentric part rotatably mounted on the crank pin. The eccentric part includes an eccentric outer surface intended for engaging with one end of a connecting rod and one toothed ring gear. A control device controls the angular position of the eccentric part. The control device includes an actuating shaft provided with an actuating pinion, at least one intermediate shaft passing axially, from side to side, through a journal and the arm of said crankshaft via a corresponding bore. The intermediate shaft is provided with a first intermediate pinion meshing with said actuating pinion and a second intermediate pinion meshing with an eccentric part.

The hedge trimmer includes a cutter drive gear rotationally driven by a drive source in a body housing, a crank cam provided in the gear and including an eccentric disk, and an upper cutter and a lower cutter slidably facing and contacting relatively. The crank cam causes the upper and lower cutters to reciprocate in relatively opposite directions along the longitudinal direction thereof. The crank cam and the upper and lower cutters are arranged in the upper face side of the gear. The cutter has a frame-shaped engagement portion that meshes with the eccentric disk so that the eccentric disk rotates while slidably contacting the inner peripheral surface of the engagement portion. The reference planes on the cutter side and the crank cam side are formed so that substantially no step is generated between the upper faces of the upper cutter and the eccentric disk.

The hedge trimmer includes a cutter drive gear rotationally driven by a drive source in a body housing, a crank cam provided in the gear and including an eccentric disk, and an upper cutter and a lower cutter slidably facing and contacting relatively. The crank cam causes the upper and lower cutters to reciprocate in relatively opposite directions along the longitudinal direction thereof. The crank cam and the upper and lower cutters are arranged in the upper face side of the gear. The cutter has a frame-shaped engagement portion that meshes with the eccentric disk so that the eccentric disk rotates while slidably contacting the inner peripheral surface of the engagement portion. The reference planes on the cutter side and the crank cam side are formed so that substantially no step is generated between the upper faces of the upper cutter and the eccentric disk.

A linear drive assembly configured for use within a power end assembly. The linear drive assembly is configured to interconnect a crankshaft and a pony rod and comprises a crosshead assembly attached to a connecting rod assembly. In one or more embodiments disclosed herein, the connecting rod assembly is configured to attach to opposite sides of the crosshead assembly so that no portion of the connecting rod assembly is disposed within an interior of a crosshead included in the crosshead assembly.

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.

According to an embodiment, a driving apparatus includes a housing, a first driving body in the housing to be rotatable around a first central axis, an eccentric driving body provided in the first driving body to be rotatable around a second central axis parallel to the first central axis, a first pivot provided at one axial end of the eccentric driving body and eccentrically to the second central axis, a second pivot provided at another axial end of the eccentric driving body and eccentrically to the second central axis, a first moving body rotatably coupled to the first pivot and linearly movable along a third central axis, a first guide body which guides movement of the first moving body, and a second guide body which guides the second pivot to be movable in a first direction.