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Half-Round Can Opener: Push the Cutter In and Twist
Seth P. Chapin, Atlantic, New Jersey · Public domain (expired patent)
Mary

Nilikha ni

Mary

6. Oktubre 2026FI
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Half-Round Can Opener: Push the Cutter In and Twist

Opening a sardine box or tin with a flat knife takes many strokes and leaves a ragged edge. Seth P. Chapin of Atlantic, New Jersey, received US 56,368, dated 17 July 1866, for an implement for opening sheet-metal cans and boxes: a cutter semicircular in section with sloping edges to a point, bevelled inside, on a handle; forced in nearly to the handle and twisted, it cuts a circle the size of its own curve, and a guard at its top keeps it in position and stops it going too deep. This rung works out how many twists a hole takes, then files the cutter from steel tube and opens a can.
Baguhan
About 2 hours

Mga Tagubilin

1

Twists for a full circle

Naglo-load ng Jupyter notebook…
2

A cutter turned round before it

The embedded blueprint shears tin round a wheel. Chapin bends the blade into a half-tube so twisting it cuts a circle.
3

Read US 56,368

"The said edges a are beveled upon their inner side to make them sufficiently sharp, and the implement is used for cutting circular holes in the tin box by forcing it, point first, into and through the sheet metal nearly up to the end of the handle A, and then turning or twisting the cutter around by means of the said handle, which causes the foremost of the edges a to cut the thin metal in a circular line corresponding to the circle of which the back or convex side of the cutter forms an arc."
4

Cut the half tube

Cut 45 mm of 25 mm steel tube and saw it in half lengthwise. Keep one half.

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

Shape the point

File both long edges to slope in to a point at one end, over the last 25 mm. Bevel them inside with a round needle file and hone.

Mga kailangang kasangkapan:

Kikil (Kikil na Pangkamay)Kikil (Kikil na Pangkamay)
Hanay ng Pinong KikilHanay ng Pinong Kikil
HasaanHasaan
Bais sa Mesang PanggawaBais sa Mesang Panggawa
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
6

Guard and handle

Epoxy a large flat washer across the cutter's top as the guard, and a hardwood handle above it.

Mga materyales para sa hakbang na ito:

Patag na SinturonPatag na Sinturon1 piraso
Mga tarugong matigas na kahoyMga tarugong matigas na kahoy1 piraso
Epoksing dalawang bahagiEpoksing dalawang bahagi1 piraso

Mga kailangang kasangkapan:

Papel de LihaPapel de Liha
7

The build in 3D

FreeCAD model of this build, not of the patent: a 25 mm half-tube cutter with sloping edges to a point, the washer guard and the hardwood handle.
File ng DisenyoBLENDCC0 - Free
I-download ang modelo
8

Twist out a hole

Stand a sealed can on the kitchen scale. Force the point through the top until the guard meets it, then twist round; count the twists, read the peak load and measure the hole.
Hakbang 8 - Image 1

Mga materyales para sa hakbang na ito:

LataLata1 piraso

Mga kailangang kasangkapan:

Digital na Timbangang PangkusinaDigital na Timbangang Pangkusina
Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
Panukat ng OrasPanukat ng Oras
Guwantes na Katad PangtrabahoGuwantes na Katad Pangtrabaho
9

A cutter that will not enter, wanders or jams

Half-round can opener troubleshooting.

Flow

Loading...
10

History and honest limits

**Seth P. Chapin** of Atlantic, Monmouth County, New Jersey, received US 56,368, dated 17 July 1866, for opening tin or other sheet-metal boxes in circles or straight or irregular lines. Widened at its widest part, the cutter cuts a larger part of a circle or oval at one thrust, leaving a piece easily bent over; another form has one edge flattened for sardine boxes, and a metal handle with a cross-piece for turning. Wyman's 1868 patent names it. **Honest limits.** A washer stands in for his guard, and the tube is unhardened. Your twist counts are the result.

Mga Materyales

5

Mga Kinakailangang Kasangkapan

13

Mga design file

1

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Pambukas ng lata (pangkamay)

Free

7
0

Kaugnay na Blueprint

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

Warner Can Opener

Warner Can Opener

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The Revolving Shear Can Opener: A Wheel and a Fixed Cutter That Cut Tin Like Shears

The Revolving Shear Can Opener: A Wheel and a Fixed Cutter That Cut Tin Like Shears

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Paggawa ng Metal

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0
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The Lid-Lifting Can Opener: One Lip Presses Down While the Other Lifts

The Lid-Lifting Can Opener: One Lip Presses Down While the Other Lifts

ni YourGrandmaIS

PAGKAIN AT INUMIN

38
0
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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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