An ignition switch, starter switch or start switch is a switch in the control system of a motor vehicle that activates the main electrical systems for the vehicle, including 'accessories' (radio, power windows, etc.). In vehicles powered by internal combustion engines, the switch provides power to the starter solenoid and the ignition system components (including the engine control unit and ignition coil), and is frequently combined with the starter switch which activates the starter motor.
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Historically, ignition switches were key switches that requires the proper key to be inserted in order for the switch functions to be unlocked. These mechanical switches remain common in modern vehicles, further combined with an immobiliser to only activate the switch functions when a transponder signal in the key is detected. However, many new vehicles have been equipped with so-called 'keyless' systems, which replace the key switch with a push button that also requires a transponder signal.
The ignition locking system may be sometimes bypassed by disconnecting the wiring to the switch and manipulating it directly; this is known as hotwiring.
See also[edit]
| Type | Switch |
|---|---|
| Electronic symbol | |
A push-button (also spelled pushbutton) or simply button is a simple switch mechanism to control some aspect of a machine or a process. Buttons are typically made out of hard material, usually plastic or metal.[1] The surface is usually flat or shaped to accommodate the human finger or hand, so as to be easily depressed or pushed. Buttons are most often biased switches, although many un-biased buttons (due to their physical nature) still require a spring to return to their un-pushed state.Terms for the 'pushing' of a button include pressing, depressing, mashing, slapping, hitting, and punching.
Uses[edit]
The 'push-button' has been utilized in calculators, push-button telephones, kitchen appliances, and various other mechanical and electronic devices, home and commercial.
In industrial and commercial applications, push buttons can be connected together by a mechanical linkage so that the act of pushing one button causes the other button to be released. In this way, a stop button can 'force' a start button to be released. This method of linkage is used in simple manual operations in which the machine or process has no electrical circuits for control.
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Red pushbuttons can also have large heads (called mushroom heads) for easy operation and to facilitate the stopping of a machine. These pushbuttons are called emergency stop buttons and for increased safety are mandated by the electrical code in many jurisdictions. This large mushroom shape can also be found in buttons for use with operators who need to wear gloves for their work and could not actuate a regular flush-mounted push button.
As an aid for operators and users in industrial or commercial applications, a pilot light is commonly added to draw the attention of the user and to provide feedback if the button is pushed. Typically this light is included into the center of the pushbutton and a lens replaces the pushbutton hard center disk. The source of the energy to illuminate the light is not directly tied to the contacts on the back of the pushbutton but to the action the pushbutton controls. In this way a start button when pushed will cause the process or machine operation to be started and a secondary contact designed into the operation or process will close to turn on the pilot light and signify the action of pushing the button caused the resultant process or action to start.
To avoid an operator from pushing the wrong button in error, pushbuttons are often color-coded to associate them with their function. Commonly used colors are red for stopping the machine or process and green for starting the machine or process.
In popular culture, the phrase 'the button' (sometimes capitalized) refers to a (usually fictional) button that a military or government leader could press to launch nuclear weapons.
Scram and scramble switches[edit]
Akin to fire alarm switches, some big red buttons, when deployed with suitable visual and audible warnings such as flashing lights and sirens for extreme exigent emergencies, are known as 'scram switches' (from the slang term scram, 'get out of here'). Generally, such buttons are connected to large scale functions, beyond a regular fire alarm, such as automated shutdown procedures, complete facility power cut, fire suppression like halon release, etc.
A variant of this is the scramble switch which triggers an alarm to activate emergent personnel to proactively attend to and go to such disasters. An air raid siren at an air base initiates such action, where the fighter pilots are alerted and 'scrambled' to their planes to defend the base.
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References[edit]
- ^'Push buttons and much more'. thebuilderssupply.com. Retrieved 11 April 2013.
Further reading[edit]
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- Rachel Plotnick, Power Button: A History of Pleasure, Panic and the Politics of Pushing, MIT Press, 2018, ISBN9780262038232, reviewed in David Trotter, 'Making doorbells ring', London Review of Books22 November 2018
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External links[edit]
Switch Keys For Ryujinx
| Wikimedia Commons has media related to Push buttons. |
- Spring Return Button by Sándor Kabai, The Wolfram Demonstrations Project.