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The Single-Blow Can Opener: A Ring of Pointed Teeth Punches the Hole
Thomas A. McFarland, Meadville, Pennsylvania · Public domain (expired patent)
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6. Oktubre 2026NO
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The Single-Blow Can Opener: A Ring of Pointed Teeth Punches the Hole

Cutting into a can with a single blade takes several cuts or blows. Thomas A. McFarland of Meadville, Pennsylvania, received US 64,891, dated 21 May 1867, for "a cheap, simple, and effective implement for cutting an opening in a can by a single blow": a ring of curved pointed teeth on a handle's head, bevelled inside, whose points enter first and whose edges widen until they meet, punching out a plug that stays inside the cutter. This rung works out why pointed teeth need so little force, then files the teeth on a steel tube and punches a can top with one blow.
Katamtaman
About 3 hours

Mga Tagubilin

1

Peak force and work

Naglo-load ng Jupyter notebook…
2

A single blade before it

The embedded blueprint cuts a can top a slit at a time with one blade. McFarland rings the blade round into teeth so one blow cuts the whole opening.
3

Read US 64,891

"In operation the tool is placed on the head of the can, and the points of the teeth driven in by a smart blow, and the cutters forced down until their forks or bases have cut through the can, when a piece will have been cut out of the form of the cutters." "The teeth being bevelled on the inside tend to compress the plug removed, and cause it to remain inside the cutter, thus facilitating its removal from the can."
4

Cut and mark the tube

Cut 40 mm of 25 mm steel tube. Mark six teeth round one end, 12 mm tall, their bases touching.

Mga materyales para sa hakbang na ito:

Tubong bakal na pang-istrukturaTubong bakal na pang-istruktura1 piraso

Mga kailangang kasangkapan:

Lagaring Pang-metalLagaring Pang-metal
Bais sa Mesang PanggawaBais sa Mesang Panggawa
Pangmarkang Hindi NabuburaPangmarkang Hindi Nabubura
RulerRuler
5

File the teeth

Saw a V between each pair of marks and file the teeth to points. Bevel each tooth's inside edge with a round needle file; leave the outside flush.

Mga kailangang kasangkapan:

Lagaring Pang-metalLagaring Pang-metal
Kikil (Kikil na Pangkamay)Kikil (Kikil na Pangkamay)
Hanay ng Pinong KikilHanay ng Pinong Kikil
Bais sa Mesang PanggawaBais sa Mesang Panggawa
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
6

Fit the handle

Sand a hardwood dowel to fit the tube's other end, glue 20 mm of it in with epoxy, and leave 100 mm as the handle.

Mga materyales para sa hakbang na ito:

Mga tarugong matigas na kahoyMga tarugong matigas na kahoy1 piraso
Epoksing dalawang bahagiEpoksing dalawang bahagi1 piraso

Mga kailangang kasangkapan:

Papel de LihaPapel de Liha
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
7

The build in 3D

FreeCAD model of this build, not of the patent: a 25 mm steel tube with six 12 mm pointed teeth bevelled inside, on a hardwood handle.
File ng DisenyoBLENDCC0 - Free
I-download ang modelo
8

Punch a can top

Stand a sealed can on a hardwood block. Set the teeth on its top and strike the handle once with the mallet; count the blows needed, and measure the plug with the caliper.
Hakbang 8 - Image 1

Mga materyales para sa hakbang na ito:

LataLata1 piraso
Tipak ng Matigas na KahoyTipak ng Matigas na Kahoy1 piraso

Mga kailangang kasangkapan:

Malyong gomaMalyong goma
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
Guwantes na Katad PangtrabahoGuwantes na Katad Pangtrabaho
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
9

Teeth that bend, skid or leave the plug

Single-blow can opener troubleshooting.

Flow

Loading...
10

History and honest limits

**Thomas A. McFarland** of Meadville, Pennsylvania, received US 64,891, dated 21 May 1867, for opening oyster, fruit and other cans. The cutters are curved to fit a shoulder on the handle's head and fastened by screws; they may be one piece or sections. He disclaimed cutting an opening broadly, single shear-like cutters, and cork borers with spring handles, and claimed the handle and cutters cutting a plug at a single blow. **Honest limits.** Mild steel tube is not hardened; the notebook's shear figures are estimates. Your blow counts are the result.

Mga Materyales

5

Mga Kinakailangang Kasangkapan

11

Mga design file

1

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Pambukas ng lata (pangkamay)

Free

6
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Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

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Pagkain

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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