SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
The Float Switch: A Liquid Level Turned Into a Contact
George J. Papashvili, Los Angeles · Public domain (expired patent)
Volt

Imeundwa na

Volt

27. Septemba 2026SE
2
0
0
0
0

The Float Switch: A Liquid Level Turned Into a Contact

The float valve shuts off a cistern by itself. A float switch does the same job for an electric circuit: a float rides the liquid, and at a set level it opens or closes a contact — to start a sump pump, stop a tank overfilling, or warn that something has run dry. George J. Papashvili of Los Angeles applied it to the most expensive thing to run dry. US 1,719,078, *Float Switch*, filed 25 May 1926 and granted 2 July 1929, connects a cylinder to the engine's crankcase so the oil stands at the same level in both. A float on a spring-held rod drops as the oil falls; first it lights a lamp behind a glass marked "No oil", and then, if the driver drives on, it shorts the ignition and stops the engine. This rung works out a float's lift and why most float switches do not rely on it directly, sizes a sump pump's switching band, and builds a two-level float switch.
Mwanzo
About 3 hours

Maagizo

1

Buoyancy, and the starts a band allows

Inapakia daftari la Jupyter…
2

Read Papashvili's cut-out

Fig. 2 of US 1,719,078 shows the indicator in section: cylindrical container 8, cover 10, a rod 12 through the cover with a disc head 13, and compression spring 14 between cover and head holding the rod up. Float 16 slides on the rod above an adjustable collar 15 with a set screw. When the oil is low, "the float descends on the rod and engages the collar 15, the weight of the float compressing the spring 14" and lowering the head onto plate 20 — grounding the ignition lead to the distributor and stopping the engine. An insulating ring 31 on the head carries a conducting strip 32 that bridges contacts 28 to a lamp 26. The contacts sit higher than the ignition contact, "so that in the descent of the rod … the electric circuit through the signal lamp is established before the ignition circuit is short-circuited": warning first, shutdown second.
3

Warning before shutdown

Eneo la Kazi la Blockly

Loading Blockly workspace...

4

Build a two-level sump switch

Cut the top off a 2 L bottle to make the sump. Glue a table-tennis ball to a thin dowel that slides freely in a guide bored through a plywood bridge across the top. Fix two collars (a cable tie pulled tight) on the dowel above the bridge, 60 mm apart. Mount a lever microswitch on the bridge so the upper collar lifts its lever as the ball rises, and the lower collar pulls it back down as the ball falls — the gap between the collars is the band. Because the ball's lift is small, use the lightest lever switch and a lever long enough to need little force. Wire the microswitch so it switches the coil of a 12 V relay, and let the relay drive a small submersible pump emptying the bottle into a bucket. Pour water in steadily and count the starts a minute; move the collars closer and count again. Then fit a commercial float switch in its place and compare.

Vifaa kwa hatua hii:

Chupa ya PET (ya kinywaji chenye gesi)Chupa ya PET (ya kinywaji chenye gesi)1 kipande
Mipira ya tenisi ya mezaMipira ya tenisi ya meza1 kipande
Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande
Bati la mbao za kubandikaBati la mbao za kubandika1 kipande
Kibonyezo kidogo (kinachoendeshwa kwa mkono wa kibao)Kibonyezo kidogo (kinachoendeshwa kwa mkono wa kibao)1 kipande
Rile ya SPDTRile ya SPDT1 kipande
Pampu ya maji ya kuzamishwaPampu ya maji ya kuzamishwa1 kipande
Swichi ya kieleaSwichi ya kielea1 kipande
MajiMaji5 lita

Zana zinazohitajika:

Chanzo cha nishati ya mkondo wa moja kwa mojaChanzo cha nishati ya mkondo wa moja kwa moja
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Bastola ya gundi ya motoBastola ya gundi ya moto
Saa ya kupima mudaSaa ya kupima muda
Mtungi wa kupimiaMtungi wa kupimia
5

A float switch not switching when it should

Float switch faults, from the float up.

Flow

Loading...
6

History and honest limits

**George J. Papashvili** of Los Angeles filed **US 1,719,078** on 25 May 1926; granted 2 July 1929. Float-operated contacts had been used before for level indication; his applied the float to protect an engine, with a warning stage before shutdown. Low-oil shutdown switches are still fitted to small engines and generators. **Honest limits.** A float switch reads the level where the float is: foam, waves and sludge fool it. Its lift is small, so it must move something light. Where a level cut-out protects against harm, a second independent switch is used.

Vifaa

9

Zana Zinazohitajika

6

Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

The Float Valve

The Float Valve

na MartinNO

TEKNOLOJIA

34
0
0
0
1
0
The Telegraph Relay

The Telegraph Relay

na EdFI

Elektroniki

43
0
0
0
2
0
The Electric Self-Starter: Kettering's Motor-Generator

The Electric Self-Starter: Kettering's Motor-Generator

na VoltSE

Mitambo

3
0
0
0
0
0
Butz Thermostat

Butz Thermostat

na EdFI

Elektroniki

39
0
0
0
0
0

CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

Majadiliano

(0)

Ingia kujiunga na majadiliano

Inapakia maoni...