A positioning locking mechanism of a rotational member comprising a rotational positioning member provided with a positioning groove; a rotational member pivotally connected with the rotational positioning member and rotating around the rotational positioning member; a positioning member arranged in the rotational member and movably meshed with the positioning groove; and a locking operation member arranged in the rotational member to control the motion of the positioning member. The positioning locking mechanism can effectively ensure that the positioning and locking of the rotational member cannot be invalid due to accident collision or component fatigue.

A mechanical hard stop for a sensor system includes a base for fixation to a gimbal or static structure, a movable stop member for engagement with a fixed stop member, and an actuator. The movable stop member has a disengaged position, proximate the base, and an engaged position, spaced apart from the base. The actuator is operably connected to the movable stop member to displace the movable stop member between the disengaged position and the engaged position according to a sensor selection received by the sensor system. Sensor systems and imaging methods are also described.

A head-mounted device includes a device housing and a headband that is configured to support the device housing with respect to the user. A first connector part is connected to the headband, wherein the first connector part includes a first electrical connector portion. A second connector part is connected to the device housing, wherein the second connector part includes a second electrical connector portion. The first connector part and the second connector part are movable between a connected position, in which the first electrical connector portion is in engagement with the second electrical connector portion, and a disconnected position, in which the first connector part is spaced from the second connector part and the first electrical connector portion is not in engagement with the second electrical connector portion. The headband is able to rotate with respect to the device housing in the connected position.

A method for displacing a ceiling formwork for a nearest concreting section, wherein first and second supporting devices for supporting the ceiling formwork are arranged below the nearest concreting section. Said supporting devices each have a shuttering position and a stripping position, wherein the ceiling formwork is raised to a concreting level in the shuttering position and lowered relative to the concreting level in the stripping position. The first supporting device is moved into the stripping position and the second supporting device is moved into the shuttering position, and a collision protection element is arranged between the second supporting device and an end face of the ceiling formwork when the end face of the ceiling formwork strikes the second supporting device after passing over the first supporting device, so the collision protection element forms a flank rising in the displacement direction for guiding the ceiling formwork in the displacement direction.

A multi-dimensional microphone stand includes a first rotational module, a first rotational arm, a second rotational module, a second rotational arm, and a third rotational module. The first rotational arm is connected to the first rotational module, and the second rotational module is connected to the first rotational arm, and the first rotational module is rotatable relative to the second rotational module. The second rotational arm is connected to the second rotational module, the third rotational module is connected to the second rotational arm, and the second rotational module is rotatable relative to the third rotational module. In addition, in a folded state, the first rotational arm and the second rotational arm are arranged side by side and connected to the second rotational module in parallel.

A photovoltaic system includes a collection of photovoltaic modules, a base supporting the collection of photovoltaic modules, and a damper coupled between the collection of photovoltaic modules and the base. The damper resists movement of the photovoltaic modules relative to the base. The damper has a first damping ratio when the collection of photovoltaic modules moves at a first rate relative to the base and a second damping ratio when the collection of photovoltaic modules moves at a second rate relative to the base, and the damper passively transitions from the first damping ratio to the second damping ratio.

An apparatus includes a head portion, an undercarriage portion, and a telescopic portion configured to adjustably move into a plurality of different lengths. A first end of the head portion is rotatably attached to a first end of the undercarriage portion and a second end of the undercarriage portion is rotatably attached to a first end of the telescopic portion. A second end of the head portion is rotatably attached to a second end of the telescopic portion. In a first position, the telescopic portion has a first length of the plurality of different lengths and the head portion and the undercarriage portion form a first angle. In a second position, the telescopic portion has a second length of the plurality of different lengths and the head portion and the undercarriage portion form a second angle different from the first angle.

A photovoltaic system includes a collection of photovoltaic modules, a base supporting the collection of photovoltaic modules, and a damper coupled between the collection of photovoltaic modules and the base. The damper resists movement of the photovoltaic modules relative to the base. The damper has a first damping ratio when the collection of photovoltaic modules moves at a first rate relative to the base and a second damping ratio when the collection of photovoltaic modules moves at a second rate relative to the base, and the damper passively transitions from the first damping ratio to the second damping ratio.

A mirror assembly can include a housing, a mirror, and a light source. In certain embodiments, the mirror is rotatable within a support portion of the mirror assembly. In some embodiments, the mirror assembly includes a light pipe configured to emit a substantially constant amount of light along a periphery of the mirror. In some embodiments, the mirror assembly includes a sensor assembly. The sensor assembly can be configured to adjust the amount of emitted light based on the position of a user in relation to the mirror.

A mechanical hard stop for a sensor system includes a base for fixation to a gimbal or static structure, a movable stop member for engagement with a fixed stop member, and an actuator. The movable stop member has a disengaged position, proximate the base, and an engaged position, spaced apart from the base. The actuator is operably connected to the movable stop member to displace the movable stop member between the disengaged position and the engaged position according to a sensor selection received by the sensor system. Sensor systems and imaging methods are also described.