Abstract: A gangable electrical unit for positioning an electrical component beside an electrical outlet box that includes a bracket having a wall structure that defines a front opening is disclosed. First and second arms extend from the bracket and may each include an attachment wall extending from a front edge of the bracket and a support wall extending from the bracket behind the attachment wall. The attachment wall may include an electrical box mounting aperture therethrough. The bracket is configured for attachment to an adjacent electrical device mounting box by aligning the electrical box mounting apertures of the first and second arms with electrical box mounting apertures of the adjacent electrical device box. In addition, a gap between the attachment walls of the first and second arms is larger than an outer wall height of the adjacent electrical device mounting box.

Abstract: A convertible electrical device cover including a base and an adapter coupled as an assembly and configured to accommodate an electrical device. When the convertible electrical device cover is placed in an operative position over the electrical device the adapter may be located between the electrical device and a rear of the base. In particular implementations, a portion of the adapter may be located behind the yoke of the electrical device. The adapter may be movably coupled to the base. A method for installing a convertible electrical device cover is also disclosed including placing the convertible electrical device cover in an operative position over an electrical device so that an adapter may be located between the electrical device and a rear of a base.

Abstract: An electrical device cover with a lid coupled to a base assembly includes an adapter that couples to the base through sliding lateral to the opening in the base. Particular implementations of an adapter include adapters with “L-” or other-shaped engagement tabs and adapters includes straight, flat or pin-shaped engagement tabs. In particular implementations using an engagement tab, the adapter may be moved toward the base either before or after sliding parallel to the base surface, and thus engages with the base. In other implementations, the adapter is simply slid parallel to the base surface to engage with the base.

Abstract: Methods of cleaning a swimming pool using a swimming pool cleaning head. A first method may include intermittently raising a nozzle head under water and ejecting a stream of water under water, incrementally rotating the nozzle head in a clockwise direction, retracting the nozzle head, sliding a cam reverser, and reversing the direction of rotation of the nozzle head with the cam reverser to counterclockwise. A second method may include rotating a stem by sliding at least one pin coupled to the stem through at least one channel in a cam, the stem configured to release a stream of water under water in a swimming pool. The method may further include reversing the direction of rotation of the stem by sliding a slidable section of the cam with the at least one pin.

Abstract: A system for generating a frequency reference signal comprising an oscillator, a direct digital synthesizer coupled to the oscillator and configured to receive a signal output from the oscillator, a digital to analog converter coupled to the direct digital synthesizer and configured to receive a sampled signal from the direct digital synthesizer and to convert the sampled signal to an analog waveform, and a bandpass filter coupled to the digital to analog converter and configured to select an aliased output signal from the digital to analog converter at a Nyquist zone other than a first Nyquist zone and to output the frequency reference signal.

Abstract: Time delay and frequency offset calculation systems and related methods. System implementations include modules coupled together configured to calculate a time delay and a corresponding frequency offset of a second signal delayed in time relative to a first signal with the maximum value of a magnitude of a delay optimization function. Implementations of a method for calculating a time delay and frequency offset calculate the maximum value of the delay optimization function by generating the cross-correlation of one or more adjacent discrete Fourier transformed blocks corresponding to the first signal and second signal, respectively, of two or more discrete Fourier transformed blocks. The maximum value of the delay optimization function is then identified. Implementations of the method may compare the identified maximum value of the magnitude of the delay optimization function with a threshold to determine whether to continue processing for additional adjacent discrete Fourier transformed blocks.

Abstract: A method and structure of a system of electrical boxes having at least two screw boss channels and at least two screw protrusions wherein the screw boss channels are complimentary shaped to the screw protrusions for selectively nesting like-ganged electrical boxes while preventing nesting of dislike-ganged electrical boxes for more space-efficient storage of electrical boxes while increasing inventory control and accuracy.

Abstract: A light emitting diode (LED) assembly. Implementations of an LED light assembly may include a base having a circuit including a one or more LEDs, a thermally conductive polymer support coupled to the circuit, and a non-thermally conductive polymer member coupled to the thermally conductive polymer support. A non-thermally conductive polymer lens cover may be coupled to the non-thermally conductive polymer member. The non-thermally conductive polymer lens cover may be configured to enclose the circuit of the base when coupled to the non-thermally conductive polymer member.

Abstract: The invention relates to a system for landing UAV's. The system comprises a slingshot structure that includes arm based structure and an axis installed along the arm of the structure and enabling the arm to move around it. The system comprises a base connecting the axis to a platform at which the system is installable. The system also includes a controlled pulling and braking means that connects the arm of the structure and the platform upon which the system is installable and stretchable elastic installed in a stretched manner at a gap formed between two arms and set to connect with a landing UAV. At the landing phase, the controlled pulling and braking of the system essentially breaks the motion of the arm based structure that is propelled to revolve around the system's axis, and propels the structure to move around the axis.

Abstract: An integrated side-view mirror and LED spotlight wherein under electronic control the light output can be changed in type, angle, direction, intensity, pattern, focus, and other properties and can include other inputs and outputs such as traffic preemption and data interfaces, sensors, cameras, sirens, and speakers. The device includes a side-view mirror assembly that may be attached to a vehicle, a spotlight integrated therein, and a controller unit that transmits and receives electronic data to and from the spotlight. A heat-dissipation surface or mechanism may be further integrated with the LEDs. A method of operating the device includes providing a side-view mirror assembly, integrating a spotlight capable of emitting light within the side-view mirror assembly; and providing a controller unit that transmits and receives electronic data to and from the spotlight.

Abstract: A jacket for an inflatable bladder such as an exercise ball. The jacket has a durable cover with an access section having an inner panel defining an access opening. Outer panels overlie the inner panel and have edges which extend across the opening and are provided with closures. In use, the outer panels may be separated at fasteners so a bladder may be removed or inserted through the access opening. The inner panel and the outer panels may be a woven material with their weave oriented to resist distortion when the bladder is inflated and to assist in securing the closure. The cover may be any suitable material such as a coated nylon providing durability.

Abstract: A swimming pool water leveler system. Implementations may include a water leveler comprising one or more of the following aspects: separate fill and sensing chambers within the water leveler housing; logical water level adjustment features that provide a tactile indicator of water level change; a continuous balance line and overflow line; a water supply line seal valve with a cup seal; a reducer plug in an outlet between the sensing chamber and the balance line to assist in junk removal; and the ability to pressure test the balance line and overflow line at the same time.

Abstract: A retrofit electrical outlet comprises an electrical box comprising one or more moveable braces coupled to linear brace actuators, whereby pulling on the linear brace actuator causes the brace to move toward the front end of the box to impinge a wall surface material between the brace and a front flange of the box. Releases may be included to allow for adjustment of the braces. The braces may move linearly or pivotally toward the wall surface material. The linear brace actuator may be stored within the wall for future use.

Abstract: An electrical outlet cover assembly with an electrical outlet mounting box having a front edge that does not extend beyond a front surface of a wall. An extendable base is coupled with the electrical outlet mounting box and is slideable between collapsed and extended positions. When collapsed, a leading edge of the extendable base does not extend beyond the front surface of the wall. One or more guides resist decoupling of the extendable base and the electrical outlet mounting box. A lid is pivotably coupled with the extendable base, and one of the lid and the extendable base has a cord port along their respective edges. The lid has a front surface and is positionable between open and closed positions. The lid's front surface is substantially flush with the front surface of the wall when the base is collapsed and the lid is closed with respect to the extendable cover.

Abstract: An electrical device cover comprises a base with an opening in a back wall of the base sized to receive an electrical device and a lid coupled to the base at a first base end through a hinge, the lid pivotable between and open position and at least one closed position. The base comprises a notch on a base wall extending away from the first base end. A first lid end is hingedly coupled to the first base end such that the first lid end is selectively adjustable with respect to the base toward and away from the second base end. A lid pin extends from the lid towards the notch when the lid is in at least one closed position wherein the lid pin seats in the notch when the first lid end is selectively adjusted toward the second base end.