Electrical toggle

A remarkable feature of phosphazene polymers of types (1) and (2) is that appropriate substituents (which are readily attached) can be used as toggle switches to turn several properties, such as hydrolytic stabiHty and electrical conductivity, on and off (1). 

A press for vulcanising rubber products, operated by electricity and held shut by a mechanical toggle or elbow joint. See Daylight Press. Tolerance... 

There is a variation of compression molding wherein the so-called toggle press is used. Instead of using a hydraulic press, one uses an electrically operated press, which is opened and closed mechanically via toggles. The molds are built into the specialized press. The most important press of his type is used for molding tires (wherein a pressurized steam-fiUed bladder or bag is used as a collapsible core). 

An all-electric machine has no hydraulic pumps. The toggles in the clamping unit are extended and retracted by a servomotor and a reduction drive gear is used to achieve the required forces. The clamps are much more stable since they have no hydraulic system to generate heat and the servomotors provide extremely accurate movement of the machine components. It is also much cleaner to operate than the other types of molding machines. All-electric machines are the machine of choice for most medical products. 

Clamping units support the mold, hold the mold closed during injection, open and close the mold as rapidly as possible, provide for part ejection, and provide mold close protection. The four types of clamps are hydraulic, hydraulically actuated toggle (mechanical), electrically actuated toggle, and hydromechanical. 

Fig. 35. Diagram of the system used to pressure-eject peptides from multibarrelled pipettes. A pressure of (50 Ib/in ) was supplied to the system from a nitrogen cylinder through a standard gas regulator in series with A, an electronic/pneumatic valve, and an adjustable needle valve control B. A toggle switch two-way valve C was used either to connect the remainder of the system to the pressure cylinder, or to open it to the atmosphere through an exhaust. A pressure transducer (Statham PM6) was connected at D, to each of the individual pipette lines E. Pressure tubing was secured to the side barrels of the multibarrelled electrode by O ring connectors. Z and Y represent a second means of control in which the pressure application was controlled by the output of the conventional electrical stimulator, using a circuit identical to that developed by McCaman et al. (1977). (From Dingledine et ah, 1980.)...

A fault is a manifestation of a defect An example is a digital device output pin that does not toggle correctly. For simphcity, think about a two-input OR-gate whose output is stuck high. This is a fault and is a manifestation of a defect. The causing defect can be any one of several, including a defective component, an incorrectly placed component, an open input pin, or an open output pin. The fault class is a subset of the defect class. Electrical tests such as in-circuit test (ICT), boundary-scan, built-in-self-test (BIST), functional test (FT), and system test mainly detect faults. 

Pressure switches are also widely used to monitor and control pressure in semiconductor gas delivery systems. These can be used to switch an electric signal when a preset pressure is reached. They can be used to detect an overpressure situation, such as regulator failure, or they can detect an underpressure condition, such as a gas cylinder being depleted of contents. Many switches are very similar in construction to pressure gauges, having a bourdon tube that deflects a switch toggle instead of a gauge pointer. 

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