An access opening closure device is provided for enabling passage of food or medication into a confined space without providing direct access from within the confined space to outside of the confined space. The device includes a housing assembly including a body and a cover, and a slide assembly including an access door and a frame. The body defines a receptacle and first and second openings. The housing assembly is pivotally coupled to the slide assembly and is movable from an operative position to a stowed, non-operative position.

A package delivery system includes a door access panel that is moveable between an open position and a closed position, and a frame configured to be carried by a door adjacent a passageway and configured to movably mount the door access panel. The system includes an actuator, a motor, and a controller to control selective actuation of the door access panel. The system also includes a wireless communication interface to communicatively couple the controller and a smart device for receiving a remote input to actuate the door access panel between the closed and opened positions. The system further includes a user interface configured to receive local input for actuation of the door access panel. A sensing unit is also included and has a position sensor to generate position signals to the controller. A scanning unit is coupled to the controller to scan packages delivered through the passageway.

A hinged-panel opening and closing system includes: an anchor designed to be located on a hinged panel; a gear motor designed to be located on a supporting structure; and a movement-enabling component capable of angularly displacing the hinged panel relative to a receiving structure. The movement-enabling component includes: (a) a movement-enabling shaft located on the supporting structure and, at one shaft end, coupled to the gear motor; (b) a spindle located on supporting structure and coupled to the movement-enabling shaft; and (c) a linear element attaching, at a first end, to the spindle and attaching, at a second end, to the anchor such that said linear element extends between the spindle and the anchor.

A spring actuated engagement device for remotely coupling a movable member to a stationary member comprises a fixture mountable onto a stationary member, a spring biased bar that is axially displaceable within a central recess formed within the fixture, an abutting element extending outwardly from the bar for actuating the spring, and a seating element outwardly spaced from the fixture and longitudinally spaced from the abutting element. The abutting element is axially displaceable in a first direction when contacted by a first edge of a movable member, allowing a second edge of the movable member to be received in an interspace between the seating element and the outer face, and to be axially displaced in a second direction after a force that initiated the contact with the first edge is released. A pivotally displaceable locking device, when set to a locked condition, prevents displacement of the actuator.

A secure package delivery and pick-up system includes a security door having a frame, and one or more collapsible storage compartments affixed to the frame. The collapsible storage compartments are configured for accommodating packages. An electronic unit is mounted on the frame, and is configured for electronically controlling an operation for the collapsible storage compartments. A security device is connected to the security door and receives images of a physical object from a first camera, receives an indication from at least one security tether indicating movement of the at least one physical object, and provides an alert based on the indication of movement of the at least one physical object.

A hinged-panel opening and closing system includes: an anchor designed to be located on a hinged panel; a gear motor designed to be located on a supporting structure; and a movement-enabling component capable of angularly displacing the hinged panel relative to a receiving structure. The movement-enabling component includes: (a) a movement-enabling shaft located on the supporting structure and, at one shaft end, coupled to the gear motor; (b) a spindle located on supporting structure and coupled to the movement-enabling shaft; and (c) a linear element attaching, at a first end, to the spindle and attaching, at a second end, to the anchor such that said linear element extends between the spindle and the anchor.

A passage barrier has first and second guide elements that cooperate to define a gate region, through which a person passes from an entrance region into a passage region. The passage barrier has a drive a drive unit. The drive has an output unit including a hollow shaft having an outer shell surface. The hollow shaft has a barrier element mount formed for fixing a plate-shaped barrier element on the hollow shaft and is formed substantially in a U-shape. The barrier element is fixed between the limbs of the barrier element mount, wherein at least two adhesive grooves are provided on the inside at the base of the barrier element mount. At least two opposing adhesive grooves are provided for receiving an adhesive on the inside on both limbs of the barrier element mount and opposing grooves are formed on the inside at distal ends of the barrier element mount.

A cover plate assembly, a wind power tower tube, and a wind turbine. The cover plate assembly comprises: a drive component, comprising a swing rod (6) provided with a first limiting component (3); and a cover plate (8), suitable for rotating between a first position and a second position along with rotation of the swing rod (6), the cover plate (8) being provided with a guide component (4), and the guide component (4) moving along the swing rod (6) in a swinging process of the swing rod (6). At the second position, the guide component (4) is in limiting fit with the first limiting component (3), so as to limit the swing rod (6) to drive the cover plate (8) to move back towards the first position; and when the cover plate (8) rotates towards the second position, matching between the first limiting component (3) and the guide component (4) can prevent the cover plate (8) from continuing rotating.

A hinged-panel opening and closing system includes: an anchor designed to be located on a hinged panel; a gear motor designed to be located on a supporting structure; and a movement-enabling component capable of angularly displacing the hinged panel relative to a receiving structure. The movement-enabling component includes: (a) a movement-enabling shaft located on the supporting structure and, at one shaft end, coupled to the gear motor; (b) a spindle located on supporting structure and coupled to the movement-enabling shaft; and (c) a linear element attaching, at a first end, to the spindle and attaching, at a second end, to the anchor such that said linear element extends between the spindle and the anchor.

A hinge is configured for attaching at least two components of a structural element, a fixed component and an articulated component, and is constructed out of assembly hanger designed for mounting the hinge to fixed component, at least one base coupler rotatably attached to assembly hanger, so that, the swivel axle of that attachment runs through top pin, through which base coupler is attached to assembly hanger and assembly hanger includes race for travelling pin, determining the position of the variable swivel axle of articulated component relative to fixed component attached to one another via the hinge.