Not too cosy feel in the evening opening the door in the unlit apartment. You have to fumble along the wall in search of switch risk anything to trip or stumble. And if you make it to the hallway was illuminated simultaneously with your arrival home?
A similar device is known. So the light comes on inside the fridge when you open it. Do the same for the hallway. You’ll need only one microswitch, aluminum strip with a thickness of about 2 mm and a metal area with a length of 40— 50 mm. there is No need to explain how the device works, it is seen from the figure. Please note that the contacts of the microswitch are activated in parallel with the power switch contacts.
…You open the front door, the hallway brightly lit. Before shutting the door, reach for the light switch — click! Well, now the door can be closed, the light will not go off.
Another way to use the door as a “switch” — it is suitable for rooms the doors of which are absolutely necessary for a close.
The switching device is an ordinary push-button switch — this is used in floor lamps, table. lamps.
Fig. 1. Installing microswitch for hallway lighting:
1 — casing, 2 — door, 3 — button, 4 — dural area, 5 — figure plate, 6 — screws, 7 — network switch 8 — interior light.
Fig. 2. Another design is the “door” switch and the device pressure plate, bracket:
1 — stationary bracket 2 — spring, 3 — lever clip, 4 — nut 5 —bolt.
And now look at figure 2. A push-button switch embedded in the door frame (for this it hollows out a groove) and provorachivaetsya to dural plate. Push the device consists of two pivotally interconnected clamps. One of them is secured with two screws to the door, and the other is push — acts like your finger when you turn on the light. Spring working in torsion, forces us to click the switch at the beginning of the stroke of the door.
So, the device is assembled and debugged. You open the door — clip presses the button, and lights up the ceiling; the door is closed, interior light stays on; open the door again— clip again presses the button and the light goes out; the door’s locked, your device is ready for a new cycle of operation.
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