Apparatus for converting between rotary motion and linear motion includes a rotatable piece being rotatable about an axis; at least one member having a linking surface facing the rotatable piece and arranged for movement relative to the axis of the piece; and a means for linking the linking surface of the respective member and the surface of the rotatable piece, so that rotational motion of the rotatable piece causes linear movement of the at least one member, and/or linear movement of the at least one member causes rotational motion of the rotatable piece. A sawing device may include said apparatus for cutting by repetitive reciprocating cutting action. A saw blade may be configured for such a sawing device.

The present invention provides a rotatable safety seat includes a seat body, a seat base and a rotation component. The rotation component is slidably connected between the seat body and the seat base. The seat body is slid relative to the seat base via simultaneous shifting and rotation. The rotation component is slidably connected between the seat body and the seat base. During slid of the seat body, the seat body is shifted due to the slide, the seat body is shifted because of the slide, so as to move the seat body close to or away from the seat base; in the meantime, the seat body is rotated when being shifted, so that the infant or the child on the seat body is moved close to or away from the caretaker according to the actual demand. The present invention further provides a carrier with the rotatable safety seat.

The present invention provides a rotatable safety seat includes a seat body, a seat base and a rotation component. The rotation component is slidably connected between the seat body and the seat base. The seat body is slid relative to the seat base via simultaneous shifting and rotation. The rotation component is slidably connected between the seat body and the seat base. During slid of the seat body, the seat body is shifted due to the slide, the seat body is shifted because of the slide, so as to move the seat body close to or away from the seat base; in the meantime, the seat body is rotated when being shifted, so that the infant or the child on the seat body is moved close to or away from the caretaker according to the actual demand. The present invention further provides a carrier with the rotatable safety seat.

An overspeed protection switch, an overspeed governor assembly and an elevator system are provided by the present disclosure. The overspeed protection switch includes: a trigger device including a trigger member and at least one protrusion, wherein the trigger member is capable of rotating to a triggered position from an untriggered position when being toggled, and the at least one protrusion is connected to the trigger member and rotates together with the trigger member; an actuation device including an action end capable of performing a linear movement; and a reset member which is connected with the action end of the actuation device and is translated with the linear movement of the action end of the actuation device so as to push one of the at least one protrusion to drive the trigger member to return to the untriggered position from the triggered position.

An overspeed protection switch, an overspeed governor assembly and an elevator system are provided by the present disclosure. The overspeed protection switch includes: a trigger device including a trigger member and at least one protrusion, wherein the trigger member is capable of rotating to a triggered position from an untriggered position when being toggled, and the at least one protrusion is connected to the trigger member and rotates together with the trigger member; an actuation device including an action end capable of performing a linear movement; and a reset member which is connected with the action end of the actuation device and is translated with the linear movement of the action end of the actuation device so as to push one of the at least one protrusion to drive the trigger member to return to the untriggered position from the triggered position.

An Unmanned Aerial Vehicle (UAV) according to various embodiments may include: a housing; a motor arranged in an inner space of the housing; a rotor which is rotated by the motor and includes at least one cam structure; and at least one landing member which serves as at least part of the housing and selectively protrudes from the housing depending on interference of the cam structure. An UAV according to various embodiments may include: a housing; at least one rotor blade arranged in an inner space of the housing; and at least one landing member. The at least one landing member may serve as part of the housing in a closed position and protrudes from the housing in an open position such that a load of the UAV can be supported during landing. Other embodiments are also possible.

An actuator primarily activated by transversal acceleration arising from rotational acceleration of a rotatable object is presented. The object is rotatable in a plane of rotation (P) about an object pivot point in the plane of rotation (P). The actuator comprises at least two bodies adapted to be rotatably, in or parallel to the plane of rotation (P), coupled to the object at a body pivot point of each body. The body pivot point and/or the body is arranged such that a mass distribution of the body is nonuniform about the body pivot point. Due to said nonuniform mass distribution about the body pivot point, the actuator is configured to transition to an activated state, in response to rotational acceleration of the object, by said at least two bodies rotating about their respective body pivot points in a direction opposite to a direction of said rotational acceleration of the object.

An actuator primarily activated by transversal acceleration arising from rotational acceleration of a rotatable object is presented. The object is rotatable in a plane of rotation (P) about an object pivot point in the plane of rotation (P). The actuator comprises at least two bodies adapted to be rotatably, in or parallel to the plane of rotation (P), coupled to the object at a body pivot point of each body. The body pivot point and/or the body is arranged such that a mass distribution of the body is nonuniform about the body pivot point. Due to said nonuniform mass distribution about the body pivot point, the actuator is configured to transition to an activated state, in response to rotational acceleration of the object, by said at least two bodies rotating about their respective body pivot points in a direction opposite to a direction of said rotational acceleration of the object.

Disclosed are an electric spiraling piston and systems, devices, apparatuses, and methods utilizing same. An electric spiraling piston includes a drum around which the piston spirals as it is being retracted. A spinning axis of the drum is functionally connected to the drive shaft of a motor, such that motor torque is relayed to the axis. The axis, when spinning with the drum in a first direction, causes the piston to un-spiral and extend out of a housing —while rounding its cross section — to assume a straight, rigid position/orientation. The Axis, when spinning with the drum in a second direction, causes the piston to be retracted back into the housing — while flattening its cross section — to assume a spiral orientation within the housing.

Disclosed are an electric spiraling piston and systems, devices, apparatuses, and methods utilizing same. An electric spiraling piston includes a drum around which the piston spirals as it is being retracted. A spinning axis of the drum is functionally connected to the drive shaft of a motor, such that motor torque is relayed to the axis. The axis, when spinning with the drum in a first direction, causes the piston to un-spiral and extend out of a housing —while rounding its cross section — to assume a straight, rigid position/orientation. The Axis, when spinning with the drum in a second direction, causes the piston to be retracted back into the housing — while flattening its cross section — to assume a spiral orientation within the housing.