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The Pressure-Fed Fountain Paint Brush: Air Pushes the Paint, a Finger Stops It
Gottfried Meyer and Charles G. Braun, Philadelphia, Pennsylvania · Public domain (expired patent)
Emma

Creato da

Emma

6. ottobre 2026SE
22
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The Pressure-Fed Fountain Paint Brush: Air Pushes the Paint, a Finger Stops It

Painting from a pot means stopping every few strokes to reload the brush. Gottfried Meyer and Charles G. Braun of Philadelphia received US 821,879, patented 29 May 1906, for a fountain paint brush: a reservoir pressurised through an air pipe with a check valve sends paint along a hose to a tube in a recess of the brush head and out through a flattened flexible web among the bristles; a spring holds a plunger open, and the forefinger pushes its knob to cut the paint off. This rung works out how paint thickness and pressure set the flow, then builds the tank from a bottle and a tyre valve, feeds a brush, and measures the flow.
Intermedio
About 3 hours

Istruzioni

1

Flow through the hose

Caricamento del notebook Jupyter…
2

A one-way valve before it

The embedded blueprint lets flow pass one way only. Meyer and Braun put one on the air pipe so the pumped air stays in the paint tank.
3

Read US 821,879

"The knob 35 is disposed in convenient position for the fore or index finger of the hand which holds the brush, and the valve or plunger 33 can thus be easily maintained in its closed or inward position and the supply of paint cut off when not required." "The air-pressure causes the paint to flow to the brush no matter in what position the latter may be held and the flow is under complete control of the operator, as above noted."
4

Fit the cap

Drill a 1.5 L PET bottle's cap for a tyre valve and for vinyl tubing. Seat the valve, and push the tubing through until it touches the bottom. Seal both with epoxy.

Materiali per questo passaggio:

Bottiglia in PET (bevanda gassata)Bottiglia in PET (bevanda gassata)1 pezzo
Valvola dello pneumaticoValvola dello pneumatico1 pezzo
Tubo in vinile trasparenteTubo in vinile trasparente1 pezzo
Resina epossidica bicomponenteResina epossidica bicomponente1 pezzo

Strumenti necessari:

Trapano a batteriaTrapano a batteria
Serie di punte da trapanoSerie di punte da trapano
Taglierino di precisioneTaglierino di precisione
5

Feed the brush

Drill a 6 mm hole down through the stock of a 70 mm brush from the set, beside the handle. Push silicone tubing through it into the bristles and flatten its last 30 mm with a cable tie.

Materiali per questo passaggio:

Tubo in siliconeTubo in silicone1 pezzo
Fascette per caviFascette per cavi1 pezzo

Strumenti necessari:

Morsa da bancoMorsa da banco
Trapano a batteriaTrapano a batteria
Serie di punte da trapanoSerie di punte da trapano
Set di pennelliSet di pennelli
6

Make the finger valve

Screw a hardwood block to the handle over the tubing. Fit an M5 screw through it with a spring under the head, so the screw rests off the tube and a press of the forefinger pinches it shut.

Materiali per questo passaggio:

Tasselli di legno duroTasselli di legno duro1 pezzo
Viti da metalloViti da metallo1 pezzo
Set di molle di compressioneSet di molle di compressione1 pezzo

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
Trapano a batteriaTrapano a batteria
Serie di punte da trapanoSerie di punte da trapano
Set di cacciavitiSet di cacciaviti
7

Join and pressurise

Join the bottle's tubing to the brush's with a 1.5 m length. Half fill the bottle with acrylic paint thinned with water, cap it, and pump to 0.2 bar on the gauge.

Materiali per questo passaggio:

Set di colori acriliciSet di colori acrilici1 pezzo
AcquaAcqua1 pezzo

Strumenti necessari:

Pompa da biciclettaPompa da bicicletta
ManometroManometro
8

The patent drawing

US 821,879 drawing sheet, public domain (expired patent).
Passo 8 - Image 1
9

Measure the flow

Hold the brush over the measuring cylinder for 30 s and read the paint. Repeat at 0.4 bar, with the brush upside down, and with the button pressed.
Passo 9 - Image 1

Strumenti necessari:

Cilindro graduatoCilindro graduato
CronometroCronometro
ManometroManometro
10

A brush that floods, starves or will not stop

Pressure-fed fountain paint brush troubleshooting.

Flow

Loading...
11

History and honest limits

**Gottfried Meyer** and **Charles G. Braun** of Philadelphia filed US 821,879 on 22 November 1905; it was patented 29 May 1906. Their reservoir has a valve casing with a detachable plug valve; a pipe reaches the bottom with lateral apertures; a sheet-metal band closes the recess in the brush head; all parts detach for cleaning when the colour is changed. **Honest limits.** A pinch on silicone tubing stands in for their plunger in a tube, and a PET bottle at low pressure for their reservoir. The notebook treats paint as a simple liquid. Your flows are the result.

Materiali

11

Strumenti richiesti

11

Blueprint correlati

Questi blueprint condividono conoscenze — tecniche, materiali o principi

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