SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum
A hermetically sealed tin can was opened with a knife or a chisel, which slips and tears the metal.
John Willard of Norwich, Connecticut, received US 57,422, dated 21 August 1866, for an instrument for opening tin cans made of one piece of metal: a pointed blade at right angles to the handle, ending in two right-angle shoulders that rest on the can top as the fulcrum and press the cut edges down as the blade advances.
This rung works out the force the lever saves, then forges the opener from flat bar and opens a can with it.
Kati
About 3 hours
Maagizo
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Cutting force and hand force
Cutting force and hand force
Inapakia daftari la Jupyter…
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A lever-knife opener before it
A lever-knife opener before it
The embedded blueprint cuts a can with a lever and a guard. Willard makes blade, fulcrum and handle in one piece, the shoulders resting on the can.
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Read US 57,422
Read US 57,422
"This will bring the shoulders b b upon the top surface of the can, so that these shoulders will serve as a fulcrum when the handle of the knife is depressed, and cause the cutting-edge a' of the blade B to make a slit through the can top."
"The shoulders b b not only serve as the support for the instrument upon the can, but these shoulders also press the edges of the metal down as the instrument is moved up to its work."
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Mark and cut the blank
Mark and cut the blank
Cut 190 mm of 25 × 3 mm flat bar. At one end mark a 10 mm neck 12 mm long, then the 30 mm blade with its point; saw and file the neck, leaving the shoulders full width.
Vifaa kwa hatua hii:
Pau Bapa la Chuma Laini1 kipandeZana zinazohitajika:
Msumeno wa chuma
Kibano cha meza ya kazi
Tupa (Tupa ya Mkono)
Rula
Kalamu ya Wino wa Kudumu5
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Twist the blade
Twist the blade
Grip the neck in the vice and twist the blade a quarter turn with the wrench, so it stands at right angles to the handle.
Zana zinazohitajika:
Kibano cha meza ya kazi
Spana inayoweza kurekebishwa
Glavu za Kazi za Ngozi6
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Grind the edge and point
Grind the edge and point
File the blade's upper edge to a cutting bevel and its end to a sharp point. Finish on the whetstone.
Zana zinazohitajika:
Tupa (Tupa ya Mkono)
Jiwe la kunoaKibano cha meza ya kazi
Miwani ya usalama iliyo wazi7
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The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: a 130 mm handle of 25 × 3 mm bar, the shoulders, the 10 mm neck, and the pointed 30 mm blade standing at right angles to the handle.
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Open a can
Open a can
Stand a sealed can on the kitchen scale. Push the point through the top, rock the handle down on the shoulders and advance; read the peak load on the scale and time a full circle.
Vifaa kwa hatua hii:
Kopo la bati1 kipandeZana zinazohitajika:
Mizani ya dijitali ya jikoni
Saa ya kupima mudaGlavu za Kazi za Ngozi9
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A blade that tears, skids or will not pierce
A blade that tears, skids or will not pierce
Shouldered-blade can opener troubleshooting.
Flow
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History and honest limits
History and honest limits
**John Willard** of Norwich, Connecticut, received US 57,422, dated 21 August 1866. His handle may be of any length and width; the blade's lower edge may curve upward, and its cutting edge may project above the handle's flat surface so it meets the metal at a steep angle. His claim covers the one-piece opener with blade, shoulders and handle.
**Honest limits.** Mild flat bar does not hold an edge like hardened steel; the notebook's shear strength is an estimate. Your loads and times are the result.
Vifaa
2- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
11- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Faili za muundo
1Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
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.