3rd world arm lamp High short reach left.JPG
Project data
Completed 2007
Instance of folding arm lamp
Export to Open Know How Manifest
Page data
Part of 3rd world arm lamp
Type Project
Keywords Lighting, tools, steel, wire, wood
SDGs Sustainable Development Goals SDG10 Reduced inequalities
Authors stef breukel
Published 2007
License CC BY-SA 3.0
Affiliations Demotech
Language English (en)
Page views 2,925

3rd World Arm Lamp 2007 model

Lamp with a pivotable folding arm. This new type of adjustable stand has a rope for keeping a parallelogram construction in a stable position. Also the new stand has a counterpoise or counterweight that can be pushed along and turned around the standard and which is connected via a rope to the protruding part of the longest arm. The movement of the protruding part of the longest arm is not limited by a stop.

The hinge point is preferably subjected to friction and/or is preferably provided with a nut and bolt to make the adjustment of the parallelogram construction stiffer. Otherwise the adjustment of the parallelogram construction would be too weak, which is undesirable.

This new stand is characterized by the parallelogram construction which can be turned around a vertical axis, in which the fulcrum is near the point where the parallelogram construction is hinged on the standard. This puts less strain on the turning axis than would be the case if it were lower down. The position of the weight is very near the ground, this makes the new type of stand more stable than known stands.

The wooden material is cheaper in cost to make and the wooden material is better at isolating electricity.

Other names for arm lamp are: adjustable arm lamp, anglepoise lamp, architects lamp, articulated arm lamp,desklamp , Bench Lamp ,floating arm lamp , jacob jacobsen lamp, swing arm lamp, pivottable arm lamp, Arm System lamp, Task lamp, Multi-directional light, Gravity balancing lamp

Other names for a big arm lamp are: max lamp, Lightweight long arm lamp, max reach arm lamp,

3rd world arm lamp animation.gif

Disadvantages of the known balancing systems[edit | edit source]

metal lamp electric shock

Disadvantages of construction shape.

  • Matching narrow openings were human fingers can be trapped.
  • a swinging counter balance can be dangerous
  • The vertical movement of the arm is limited by two stops
  • Center of gravity is high.
  • The total weight is high.
  • This makes the stand less stable.
  • some lamps need to be clamp to a object like a table to be stable
  • Some metal lamps needed springs.
  • Springs are difficult and expensive to get, The springs can trap the user's skin or hair.
  • The springs are difficult to clean.
  • The springs can make unwanted noise.
  • The springs have a limited stretched length.
  • The stand has limited vertical movement.
  • There is a big moment force on the base.
  • the construction needs to be stronger and more heavy
  • The stand is less stable.

Disadvantages of Metal Material

  • The parts haves a complex form
  • The metal is difficult to shape with simple tools.
  • The metal is difficult to repair with simple tools.
  • Metal conducts electricity.
  • Metals can have sharp edges.
  • Sharp edges can cut the wiring.
  • Sharp edges can cut the human.

Advantages of Wooden Lamp Stands[edit | edit source]

Advantages of construction shape. On first sight the world arm lamp look strange, but technically seen dis model haves a lot of benefits.

  • The construction is as simple possible, and does not go to expenses of the quality and the ease of use.
  • The counter balance keeps the stand stable and balance the parallelogram.
  • The counter balance can be a battery or other object.
  • This stand can fold small for transportation.
  • The arms are smooth to adjust.
  • Can lift more weight and can have longer arms in proportion to the total weight.
  • The movement positions are not limited.
  • Center of gravity is low.
  • The stand is stable.
  • The stand does not need a heavy foot
  • The foot does not need a very horizontal surface
  • The total weight is very low com pair with spring lamp with heavy foot.

Advantages of wooden material

  • Wood is easy to shape and repair with simple tools
  • Wood is easy to find
  • Wood Does not conduct electricity.
  • Wood haves les sharp edges.

Measurements[edit | edit source]

How does it work/ physics basics[edit | edit source]

Wikipedia:Classical mechanics

We define the turning effect with the equation:

Moment = Force × Perpendicular distance from the pivot

Since force is measured in newtons (N) and distances in metres (m) the unit for a moment is the newton-metre (Nm).

Moments can act in two ways: clockwise or anticlockwise. Force × distance = Moment = Force × distance 1Kg = 10 (N) newtons

Force × distance + Force × distance = Moment = Force × distance
Newtons(N) × metres (m)
Newtons (N) × metres (m) = newton-metre (Nm) = Newtons (N) × metres (m)

lamp cap


lamp cap




middle arm

on the pivot distance

counter balance


counter balance

high reach 4 N × 1 m
2 N × 0.5 m = 5 (Nm) = 0.125 m × 40 N
Lang reach 4 N × 1.5 m
2 N × 0.75 m = 7.5 (Nm) = 0.187 m × 40 N
reach 4 N × 1.4 m
2 N × 0.70 m = 7 (Nm) = 0.175 m × 40 N
Low reach 4 N × 900 m
2 N × 0.45 m = 4.5 (Nm) = 0.112 m × 40 N
tools to use ~

Tools to make a balance stand[edit | edit source]

beech wood
  • (Handmade) Wood turning machine or wood cutting knife. See [[Wikipedia:Wood_turning]
  • Wood rasp
  • Sharp knife
  • Screwdrivers some sizes
  • Hand drill
  • Hammer
  • Hand wood saw
  • Metal saw hacksaw.gif
  • Glue
  • Measure tool
  • Brace and bit or drill with bits of different sizes
  • Sandpaper

Wood to make a balance stand[edit | edit source]

There are some small part wood with a tree icon , use wood that does not split easily.

wood like:

http://en.wikipedia.org/wiki/Beech wood

Rubber tree wood,

It is possible to use good quality plywood for these parts

plywood like

http://en.wikipedia.org/wiki/Birch plywood

Wood quality icon

There are some big part wood with a tree-stump icon

you can use Less quality massive wood, .

Wood like :

Pine wood



Or you can use bad quality plywood

Use no bamboo, that split to easily at the holes http://en.wikipedia.org/wiki/Bamboo

Materials to make a balance stand[edit | edit source]

Steel cylindrical bar or pipe diameter 15mm x length 800mm

Steel cylindrical bar diameter 6mm

Steel cylindrical pipe inner diameter 16mm

Metal rings

Wood screws

steel parts or brick or moppet battery for the counterbalance Weight

Rope diameter 6mm

Common type of bolds and wing nut and ring

Wood glue

Small peace of rubber

Electric wire

Thin rope

Plastic PVC pipe

How to build the balance stand parts[edit | edit source]

Step by step instructions

It is possible to make this balance stand in different sizes.

Small size balance stand[edit | edit source]

The small size balance-stand can lift 700 gram or 0.7 Kg with a counter balance of 3000 gram or 3 Kg

The max arm reach is 0 to 700mm or 0.7 meter.

This one can lift by example :

  • A normal E27 lamp + fitting + aluminium lamp cap.
  • A little old computer ventilator with some finger protection.
  • A vacuum cleaner hose.
  • A magnifier magnify lamp, loupe lamp.
  • A document holder or clipboard.
  • A mirror.
  • A small web-camera.
  • A light reflection thing .
  • A umbrella.
  • A microphone.
  • A medical object.
  • A tin-soldering tool.
  • A small Drilling or screwing tool.
  • A computer keyboard
  • A telephone
  • A microscope
  • A dishes wash rinse water crane
  • A air suction Swifel arm

Middle size balance-stand[edit | edit source]

The middle size arm-lamp can lift 700 gram or 0.7 Kg with a counter balance of 4000 gram or 4 Kg

The max arm reach is 0 to 1000mm or 1 meter.

This one can lift by example :

-The same as the middle size arm lamp.

Large size balance-stand[edit | edit source]

The large balance-stand can lift 400 gram or 0.4 Kg with a counter balance of 4000 gram or 4 Kg

The max arm reach is 0 to 1500mm or 1.5 meter.

This one can lift by example :

-The lamp weight of the 3rd world CCFL lamp (2007 model).

-A led lamp cap

-medical drinking straw.


But you can use it to lift every light weight object you want.

vacuum cleaner hose on balance-stand

More things possible[edit | edit source]

two balance-stands balancing one object

You can Use two balance-stand to lift a double weight object.

This one can lift by example :

-A big Fluorescent armature.

Dimensions[edit | edit source]

On the 3rd world arm lamp (2007 model) you find the dimensions to make the balance-stand.

links[edit | edit source]

3rd world arm lamp (2007 model)

3rd world CCFL lamp (2007 model)

Cold Cathode Fluorescent Lamps

Interwiki links[edit | edit source]