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Crank-Point Can Opener: A Bent Point to Turn On, a Knife Set in a Slot
Samuel D. Lecompte, Leavenworth, Kansas · Public domain (expired patent)
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6. Oktoba 2026NO
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Crank-Point Can Opener: A Bent Point to Turn On, a Knife Set in a Slot

A can opened with a lever knife leaves a jagged hole of any size. Samuel D. Lecompte of Leavenworth, Kansas, received US 50,011, dated 19 September 1865, for an instrument for opening fruit and other sealed cans: a bar with a handle, its end bent like a crank and pointed so that, thrust through the top, the bent part is held by the edges of the hole as a bearing; a knife slides along a slot in the bar on a set screw, and the instrument is turned round to cut. This rung works out where to set the knife for each can, then forges the bar, crank and knife and cuts a round opening.
Kati
About 3 hours

Maagizo

1

Knife position for each can

Inapakia daftari la Jupyter…
2

A lever opener before it

The embedded blueprint saws round a can with a lever knife. Lecompte gives the knife a centre to turn about and a slot to set its radius.
3

Read US 50,011

"The end of the instrument is bent somewhat in the form of a crank, and pointed, as shown by the letters b c in Fig. 1. This enables the instrument to be thrust into the top of the can in such manner that the part c, which is bent at right angles to the bar A, will be encircled by the edges of the hole made in the top of the can, thus insuring a good and sufficient bearing to enable the instrument to be operated."
4

Slot the bar

Cut 170 mm of 25 × 3 mm flat bar. Drill a row of 5 mm holes along its centre from 25 to 70 mm from one end and file them into a slot.

Vifaa kwa hatua hii:

Pau Bapa la Chuma LainiPau Bapa la Chuma Laini1 kipande

Zana zinazohitajika:

Msumeno wa chumaMsumeno wa chuma
Kibano cha meza ya kaziKibano cha meza ya kazi
Kigwe cha KatikatiKigwe cha Katikati
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya tupa ndogoSeti ya tupa ndogo
RulaRula
5

Forge the crank point

File the bar's slotted end down to 6 mm wide for its last 30 mm. Bend it down 15 mm, along 10 mm, and down again 15 mm in the vice, and file the end to a sharp point.

Zana zinazohitajika:

Tupa (Tupa ya Mkono)Tupa (Tupa ya Mkono)
Kibano cha meza ya kaziKibano cha meza ya kazi
NyundoNyundo
Miwani ya usalama iliyo waziMiwani ya usalama iliyo wazi
6

Make the knife

Cut a 6 × 25 mm knife from 1 mm steel sheet with a pointed lower end and a 5 mm hole at the top. Hone its edge.

Vifaa kwa hatua hii:

Bati la Chuma LainiBati la Chuma Laini1 kipande

Zana zinazohitajika:

Mkasi wa batiMkasi wa bati
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Tupa (Tupa ya Mkono)Tupa (Tupa ya Mkono)
Jiwe la kunoaJiwe la kunoa
7

Fit the knife and handle

Bolt the knife under the slot with an M5 screw, washer and nut as the set screw. Fit a hardwood handle to the bar's other end with epoxy.

Vifaa kwa hatua hii:

Skrubu za mashineSkrubu za mashine1 kipande
Washa bapaWasha bapa1 kipande
Nati ya pembe sitaNati ya pembe sita1 kipande
Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande
Epoksi ya Sehemu MbiliEpoksi ya Sehemu Mbili1 kipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
8

The patent drawing

US 50,011 drawing sheet, public domain (expired patent).
Hatua 8 - Image 1
9

Cut a round opening

Set the knife for the can and tighten it. Stand a sealed can on the kitchen scale, thrust the point through the top's centre, press the knife in and turn round; read the peak load, time it, and measure the hole.
Hatua 9 - Image 1

Vifaa kwa hatua hii:

Kopo la batiKopo la bati1 kipande

Zana zinazohitajika:

Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Saa ya kupima mudaSaa ya kupima muda
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
Glavu za Kazi za NgoziGlavu za Kazi za Ngozi
10

A point that tears out, a knife that slips

Crank-point can opener troubleshooting.

Flow

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11

History and honest limits

**Samuel D. Lecompte** of Leavenworth, Kansas, received US 50,011, dated 19 September 1865, for cans used for fruits, preserves and oysters. He did not limit himself to one knife shape, having adopted various styles. The patent was reissued on 4 February 1868 (No. 2,851). F. S. Wyman's 1868 patent names it as the circular opener he added a side knife to. **Honest limits.** A bolt and nut stand in for his set screw, and the knife is unhardened. Your loads and times are the result.

Vifaa

8

Zana Zinazohitajika

17

Mchoro huu unatengeneza

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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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