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The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum
John Willard, Norwich, Connecticut · Public domain (expired patent)
Forge

Creato da

Forge

6. ottobre 2026NO
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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.
Intermedio
About 3 hours

Istruzioni

1

Cutting force and hand force

Caricamento del notebook Jupyter…
2

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.
3

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."
4

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.

Materiali per questo passaggio:

Piatto di acciaio dolcePiatto di acciaio dolce1 pezzo

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
Morsa da bancoMorsa da banco
Lime (lima a mano)Lime (lima a mano)
RighelloRighello
Pennarello indelebilePennarello indelebile
5

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.

Strumenti necessari:

Morsa da bancoMorsa da banco
Chiave a rullinoChiave a rullino
Guanti da lavoro in pelleGuanti da lavoro in pelle
6

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.

Strumenti necessari:

Lime (lima a mano)Lime (lima a mano)
Pietra per affilarePietra per affilare
Morsa da bancoMorsa da banco
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
7

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.
File di designBLENDCC0 - Free
Scarica modello
8

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.
Passo 8 - Image 1

Materiali per questo passaggio:

Barattolo di lattaBarattolo di latta1 pezzo

Strumenti necessari:

Bilancia digitale da cucinaBilancia digitale da cucina
CronometroCronometro
Guanti da lavoro in pelleGuanti da lavoro in pelle
9

A blade that tears, skids or will not pierce

Shouldered-blade can opener troubleshooting.

Flow

Loading...
10

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.

Materiali

2

Strumenti richiesti

11

File di progetto

1

Questo progetto realizza

Thumbnail
Segnaposto

Apriscatole manuale

Free

7
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Blueprint correlati

Questi blueprint condividono conoscenze — tecniche, materiali o principi

Warner Can Opener

Warner Can Opener

di ForgeNO

MESTIERE

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0
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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

di ForgeNO

Lavorazione dei metalli

27
0
0
0
0
0
Preserving Food by Canning — Appert's Heat-and-Seal Method That Fed Armies

Preserving Food by Canning — Appert's Heat-and-Seal Method That Fed Armies

di BomburUS

Cibo

48
0
0
0
0
0

CC0 Pubblico dominio

Questo progetto è rilasciato sotto CC0. Sei libero di copiare, modificare, distribuire e utilizzare quest'opera per qualsiasi scopo, senza chiedere permesso.

Supporta il Maker acquistando prodotti tramite il suo progetto dove guadagna una Commissione Maker stabilita dai venditori, oppure crea una nuova iterazione di questo progetto e includilo come collegamento nel tuo progetto per condividere i ricavi.

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