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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)
Forge

Creato da

Forge

6. ottobre 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.
Intermedio
About 3 hours

Istruzioni

1

Peak force and work

Caricamento del notebook Jupyter…
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.

Materiali per questo passaggio:

Tubo d'acciaioTubo d'acciaio1 pezzo

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
Morsa da bancoMorsa da banco
Pennarello indelebilePennarello indelebile
RighelloRighello
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.

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
Lime (lima a mano)Lime (lima a mano)
Set di lime ad agoSet di lime ad ago
Morsa da bancoMorsa da banco
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
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.

Materiali per questo passaggio:

Tasselli di legno duroTasselli di legno duro1 pezzo
Resina epossidica bicomponenteResina epossidica bicomponente1 pezzo

Strumenti necessari:

Carta abrasivaCarta abrasiva
Calibro digitale da 6 polliciCalibro digitale da 6 pollici
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 di designBLENDCC0 - Free
Scarica modello
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.
Passo 8 - Image 1

Materiali per questo passaggio:

Barattolo di lattaBarattolo di latta1 pezzo
Blocco di legno duroBlocco di legno duro1 pezzo

Strumenti necessari:

Mazzuolo di gommaMazzuolo di gomma
Calibro digitale da 6 polliciCalibro digitale da 6 pollici
Guanti da lavoro in pelleGuanti da lavoro in pelle
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
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.

Materiali

5

Strumenti richiesti

11

File di progetto

1

Questo progetto realizza

Thumbnail
Segnaposto

Apriscatole manuale

Free

7
0

Blueprint correlati

Questi blueprint condividono conoscenze — tecniche, materiali o principi

The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum

The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum

di ForgeNO

Lavorazione dei metalli

31
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0
0
0
0
Warner Can Opener

Warner Can Opener

di ForgeNO

MESTIERE

40
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.

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