A door apparatus for installing in the vent opening of poultry house can include a transparent or translucent panel positioned within a substantially rectangular frame. The door apparatus can include a handle apparatus attached to the outer surface of the transparent or translucent panel. The handle apparatus can includes an elongate section extending outwardly from the outer surface of the transparent or translucent section having an opening formed therein for receiving an elongate connecting member, such as a cable or cord.

A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.

A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.

The invention discloses a detector capable of autonomously detecting the oral cavity, which includes a headband. The right end of the headband is fixedly provided with a detector, and the left end surface of the detector is fixed with an eyecup. The headband is worn behind the head. The eyecup is covered around the eyes, a display screen is provided in the headband and on the right side of the eyecup, and a light-passing port is provided between the display screen and the eyecup, and in the light-passing port A light blocking plate is provided, and an opening and closing device is provided on the upper side of the display screen and the light-passing port. The opening and closing device is provided with a lifting plate. The present invention is worn on the head and surrounds the eyes with an eye mask. The VR displays the images detected in the oral cavity. By holding a small camera in the oral cavity, the user can clearly see the situation inside the oral cavity and protect privacy. The device has excellent storage and protection. Automatic storage at the push of a button, extremely easy to use.

The invention discloses a detector capable of autonomously detecting the oral cavity, which includes a headband. The right end of the headband is fixedly provided with a detector, and the left end surface of the detector is fixed with an eyecup. The headband is worn behind the head. The eyecup is covered around the eyes, a display screen is provided in the headband and on the right side of the eyecup, and a light-passing port is provided between the display screen and the eyecup, and in the light-passing port A light blocking plate is provided, and an opening and closing device is provided on the upper side of the display screen and the light-passing port. The opening and closing device is provided with a lifting plate. The present invention is worn on the head and surrounds the eyes with an eye mask. The VR displays the images detected in the oral cavity. By holding a small camera in the oral cavity, the user can clearly see the situation inside the oral cavity and protect privacy. The device has excellent storage and protection. Automatic storage at the push of a button, extremely easy to use.

A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.

A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.

Sliding operator assemblies and associated fenestration units, systems, and methods of use and assembly are described. Some such sliding operator assemblies transition a first, linear actuation force along a first axis (e.g., vertical) to a second actuation force along a second axis (e.g., horizontal) to cause a drive mechanism to impart opening and closing forces, respectively, on the sash. Some designs relate to belt-, twisted ribbon-, or band-drive sliding operator assemblies.

Sliding operator assemblies and associated fenestration units, systems, and methods of use and assembly are described. Some such sliding operator assemblies transition a first, linear actuation force along a first axis (e.g., vertical) to a second actuation force along a second axis (e.g., horizontal) to cause a drive mechanism to impart opening and closing forces, respectively, on the sash. Some designs relate to belt-, twisted ribbon-, or band-drive sliding operator assemblies.

A trailer has a door coupled to the trailer via a hinge along the bottom of the door, a plurality of pulleys coupled to the trailer, at least one cable passing through the plurality of pulleys and tethered to the door, and a mechanism for releasing and withdrawing the cable through the pulleys, thereby actuating the door. The mechanism for releasing and withdrawing may be a hand crank, a motor, or both.