SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
The Parking Meter: A Coin That Unlocks a Clock
By the 1930s city streets were lined with cars parked all day, and shops lost the customers who could not stop. A parking meter rations the kerb: a coin buys a set time, and a signal shows anyone passing when it has run out.
Carl C. Magee of Oklahoma City, assignor to the Dual Parking Meter Company, filed US 2,118,318, *Coin Controlled Parking Meter*, on 13 May 1935; it was granted 24 May 1938. Inside a lockable head on a post, a coin completes the winding mechanism; turning the handle winds a spring; an escapement-governed train runs it down; a signal shows while the time lasts and vanishes when it has elapsed. The last coin shows in a window, and the coins fall into a sealed container so the collections can be checked. Oklahoma City installed Magee's meters in July 1935.
This rung designs the gear train and the spring for a one-hour meter and builds a coin-interlocked timer from a wind-up motor.
Kati
About 5 hours
Maagizo
1
1
Gear ratio and spring energy
Gear ratio and spring energy
Inapakia daftari la Jupyter…
2
2
One parking, as the patent describes it
One parking, as the patent describes it
Eneo la Kazi la Blockly
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3
3
What keeps the time
What keeps the time
The meter's clockwork is governed by an escapement. The embedded blueprint shows how an escapement releases a gear train one tooth at a time.
4
4
Build a coin-interlocked timer
Build a coin-interlocked timer
Take a wind-up motor mechanism and fit a pointer to its slowest output shaft; mark the run-down time of a full wind on a card dial behind it.
Make the winding key the interlock, as Magee's coin was. 3D-print a crank that drives the winding shaft through a sliding coupling: two halves with a slot between them exactly as wide as the coin. Without a coin the outer half turns freely; drop a coin into the slot and it locks the halves together, so the crank winds the spring. Put a ramp below so that when the crank has turned half a revolution the coin falls out of the slot into a box.
Try it without a coin: the crank spins, nothing winds. With a coin: one wind, the pointer runs down across its dial. Time a full run and compare with the card.
Vifaa kwa hatua hii:
Mtambo wa motori ya kuzungusha1 kipande
Sarafu ya shaba3 vipande
Bati la mbao za kubandika1 kipande
Skrubu za mashine6 vipande
Vijiti vya mbao ngumu1 kipandeZana zinazohitajika:
Printa ya 3D ya nyuzi (FDM)
Uzi wa PETG
Kekee cha Betri
Seti ya vichimbuzi
Kipima-unene cha dijitali cha inchi 6
Saa ya kupima muda5
5
A meter that takes the coin but gives no time
A meter that takes the coin but gives no time
Coin-operated timer faults.
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6
History and honest limits
History and honest limits
**Carl C. Magee** of Oklahoma City filed **US 2,118,318** on 13 May 1935, assigned to the Dual Parking Meter Company; granted 24 May 1938. Oklahoma City installed 150 of his meters along 14 blocks downtown in July 1935, charging five cents an hour; within a few years they spread to cities across the United States and abroad.
**Honest limits.** The notebook's beat rate, train losses and spring figures are illustrative, not Magee's. The printed interlock accepts anything the size of the coin — real meters gauge a coin's diameter, thickness and sometimes its metal.
Vifaa
5- Mtambo wa motori ya kuzungushaKamisheni 10%1 kipandeKishikilia Nafasi
- 3 vipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 6 vipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
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6- Kishikilia Nafasi
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Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
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