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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. Oktoba 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.
Kati
About 3 hours

Maagizo

1

Peak force and work

Inapakia daftari la 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.

Vifaa kwa hatua hii:

Mirija ya chumaMirija ya chuma1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kibano cha meza ya kaziKibano cha meza ya kazi
Kalamu ya Wino wa KudumuKalamu ya Wino wa Kudumu
RulaRula
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.

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Tupa (Tupa ya Mkono)Tupa (Tupa ya Mkono)
Seti ya tupa ndogoSeti ya tupa ndogo
Kibano cha meza ya kaziKibano cha meza ya kazi
Miwani ya usalama iliyo waziMiwani ya usalama iliyo wazi
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.

Vifaa kwa hatua hii:

Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande
Epoksi ya Sehemu MbiliEpoksi ya Sehemu Mbili1 kipande

Zana zinazohitajika:

Sandarusi (karatasi ya kusugua)Sandarusi (karatasi ya kusugua)
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
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.
Faili ya UsanifuBLENDCC0 - Free
Pakua modeli
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.
Hatua 8 - Image 1

Vifaa kwa hatua hii:

Kopo la batiKopo la bati1 kipande
Kipande cha mbao ngumuKipande cha mbao ngumu1 kipande

Zana zinazohitajika:

Nyundo ya mpiraNyundo ya mpira
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Glavu za Kazi za NgoziGlavu za Kazi za Ngozi
Miwani ya usalama iliyo waziMiwani ya usalama iliyo wazi
9

Teeth that bend, skid or leave the plug

Single-blow can opener troubleshooting.

Flow

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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.

Vifaa

5

Zana Zinazohitajika

11

Faili za muundo

1

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Kifungua mkebe (cha mkono)

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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