Lamps Balanced With One Counterweight
A Advantages of one swinging counter balance is that the lamp can have a longer arm length. Disadvantages is that the stand is less stable, the lamp need a heavy foot to stand stable.
| A single counterweight |
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This construction uses a chain to keep the arm with the counterweight and the forearm parallel. The lamp-cap and counterweight move in opposite directions (both away from the base or both towards it). The balance that is required is shown by the following formula: d1 = Lamp-cap to base; m1 = weight of lamp-cap d2 = counterweight to base; m2 = weight of counterweight m1 × d1 = m2 × d2 |
| One parallelogram with one counterweight |
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This lamp has a heavy base, with a parallelogram pantograph construction formed by bars which are all hinged on each other. One long bar extends past the parallelogram construction and has a counterweight. One short bar also extends past the parallelogram construction and holds the lamp cap. The base has an arc formed stand so the counterweight does not hit the stand in vertical position. |
| One parallelogram with an extended counterweight |
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This lamp is similar to the one above, but as the counterweight has a low position, the lamp needs no heavy foot for stability: the centre of gravity is low. The counterbalance does not swing but slides an rotate safer around the stand. |
| Three parallelograms with one counterweight |
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This lamp stand has a complex construction with matching narrow openings. This lamp is out of production . |
Read more about this topic: Balanced-arm Lamp
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