A bus hold circuit that satisfies both the over-voltage tolerance and maximum leakage current `I.sub.off` specification without incorporating a diode in pull-up path of a bus-hold circuit is disclosed herein. Specifically, the bus-hold circuit includes a first subcircuit portion operable to provide the bus-hold feature of the circuit connected to a second subcircuit portion. The second sub-circuit portion provides the over-voltage tolerance feature and minimizes the leakage current in the bus-ho...

A single line hold circuit adapted for connection between the tip and ring leads of a telephone line. The circuit comprises impedance means for connection between the tip and ring leads, the impedance means including a semiconductor element having high and low impedance states, the impedance of the low impedance state being sufficiently small to maintain the telephone line in a hold condition. The circuit further comprises means for causing the semiconductor to be in its low impedance state foll...

A roller hold down is designed to restrain parts being cut from a stack of flat sheets. The roller hold down eliminates the need for secondary fastening means to restrain the parts during the cutting operation. The parts are restrained in position on a flat worktable by a pair of cylindrical rollers adjacent the cutter which force the parts against the table. By use of the roller hold down, the restraining force applied through the rollers follows the excursions of the cutter and is applied near...

A hold-down anchor device for securing reinforcing strands in a mold while the strands are tensioned, the mold filled with concrete, and the concrete allowed to set, is held in place by an anchor means traversing the mold wall. The hold-down anchor device includes a pair of side frame elements which are disposed parallel to each other and positioned generally vertically in the mold. A number of strand hold-down means extend transversely between the side frame elements. A swivel means is pivotall...

A hold-down clamp comprises a base member adapted to be affixed to the bed of a machine tool, a clamping face adapted to clamp a work piece thereto, a vertical member rigidly affixed to the base member, a dogleg-shaped arm having one end pivoted to a mid-point in said vertical member and the other end to said clamping face, and an elongated screw between the upper end of the vertical member and the knee of the dogleg for moving the clamping face to and from the work piece.

A hinge and hold-open assembly is disclosed having a pair of hinge straps and an integral hold-open spring and pivot pin member. The spring and pin member has a pivot pin portion pivotally connecting the hinge straps and a spring portion which is operatively engaged by a cam on one of the hinge straps so as to be normally relaxed in a closed hinge condition. Then on relative pivotal movement between the hinge straps, the spring portion is radially flexed and then relatively abruptly partially un...

An auxiliary length-adjustable, flexible non-elastic strap extension is adapted to be connected to the belt hook at the lower end of a waist-to-camera length adjustable hold steady camera strap which is made of non-elastic, flexible material, to convert such waist length strap to a camera-to-foot length strap having a stirrup at its lower end, for holding the hand held camera steady at eye-to-foot level when taking pictures therewith. When not in use, the flexible hold steady strap members and a...

A sample and hold detector is described which preferably includes a differential amplifier, a current mirror and a storage capacitor which is charged and discharged to the voltage level of an electrical input signal during appropriate sampling intervals. The differential amplifier receives the electrical input signal as one input and the capacitor voltage as a second input for generating, at first and second differential amplifier output ports, currents which are a function of the voltage differ...

A camera hold steady strap composed of elastic stretch fabric having a certain amount of "give" which acts as a shock absorber when a hook having a base pivoted to the lower end of an adjustable loop formed by a portion of the strap is connected to the user's belt with the so pivoted base of the hook located behind and slightly above the top of such belt. Thus, when the strap is looped over the belt top, as when the camera falls or depends below the belt, or the camera is pulled away from the us...

An angle servo preamplifier for use in the tracking antenna servo drive sem of a precision tracking radar system. The angle servo preamplifier processes tracking error signals indicative of tracking antenna pointing errors with respect to a target. The preamplifier is comprised of an input differential amplifier stage, a phase control stage, a sample and hold stage and a power amplifier stage. In addition, interfacing circuitry is included for coupling the preamplifier to the azimuth/secant corr...