Abstract: A pressure-sensing device includes an insert for insertion into a load-bearing article of clothing such as a shoe and a controller that receives analog electrical values representing an amount of load or pressure exerted on various portions of the insert. The controller incorporates an analog-to-digital converter (ADC), a processor, and a signaling unit. The ADC converts the analog electrical values into digital values at a precision associated with the ADC. If the response of the insert and ADC to load is nonlinear, a transformation function is determined that is inversely related to a curve representing that response. Application of the function to the ADC's digital outputs cancels out the nonlinearity.

Abstract: A barber chair tray includes a tray body and adjustable connecting assemblies to connect the tray body to a barber chair. The connecting assemblies connect to a head rest assembly support structure present at the top of the chair's seatback, and allow the tray to hang at the back of the chair. The connecting assemblies allow the tray to swing away from the back of the chair when the chair's seatback is reclined to keep the tray body level, thereby preventing implements on the tray from falling off the tray. The connecting assemblies allow height and width adjustment to facilitate mounting of the chair tray to a variety of chair designs, and to allow the particular user of the tray to select a desired height at which the tray hangs while in use.

Abstract: A barber chair tray includes a tray body and adjustable connecting assemblies to connect the tray body to a barber chair. The connecting assemblies connect to a head rest assembly support structure present at the top of the chair's seatback, and allow the tray to hang at the back of the chair. The connecting assemblies allow the tray to swing away from the back of the chair when the chair's seatback is reclined to keep the tray body level, thereby preventing implements on the tray from falling off the tray. The connecting assemblies allow height and width adjustment to facilitate mounting of the chair tray to a variety of chair designs, and to allow the particular user of the tray to select a desired height at which the tray hangs while in use.