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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. Oktubre 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.
Katamtaman
About 3 hours

Mga Tagubilin

1

Knife position for each can

Naglo-load ng Jupyter notebook…
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.

Mga materyales para sa hakbang na ito:

Patag na Baras na Malambot na AseroPatag na Baras na Malambot na Asero1 piraso

Mga kailangang kasangkapan:

Lagaring Pang-metalLagaring Pang-metal
Bais sa Mesang PanggawaBais sa Mesang Panggawa
Pantudlok sa GitnaPantudlok sa Gitna
Walang-Kableng BarenaWalang-Kableng Barena
Hanay ng Talim ng BarenaHanay ng Talim ng Barena
Hanay ng Pinong KikilHanay ng Pinong Kikil
RulerRuler
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.

Mga kailangang kasangkapan:

Kikil (Kikil na Pangkamay)Kikil (Kikil na Pangkamay)
Bais sa Mesang PanggawaBais sa Mesang Panggawa
MartilyoMartilyo
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
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.

Mga materyales para sa hakbang na ito:

Plantsang Malambot na AseroPlantsang Malambot na Asero1 piraso

Mga kailangang kasangkapan:

Gunting na pangyeroGunting na pangyero
Walang-Kableng BarenaWalang-Kableng Barena
Hanay ng Talim ng BarenaHanay ng Talim ng Barena
Kikil (Kikil na Pangkamay)Kikil (Kikil na Pangkamay)
HasaanHasaan
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.

Mga materyales para sa hakbang na ito:

Mga turnilyo ng makinaMga turnilyo ng makina1 piraso
Patag na SinturonPatag na Sinturon1 piraso
Tuerkang HeksagonalTuerkang Heksagonal1 piraso
Mga tarugong matigas na kahoyMga tarugong matigas na kahoy1 piraso
Epoksing dalawang bahagiEpoksing dalawang bahagi1 piraso

Mga kailangang kasangkapan:

Llaveng inglesLlaveng ingles
Walang-Kableng BarenaWalang-Kableng Barena
Hanay ng Talim ng BarenaHanay ng Talim ng Barena
8

The patent drawing

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

Mga materyales para sa hakbang na ito:

LataLata1 piraso

Mga kailangang kasangkapan:

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

Mga Materyales

8

Mga Kinakailangang Kasangkapan

17

Ang blueprint na ito ay gumagawa ng

Thumbnail
Placeholder

Pambukas ng lata (pangkamay)

Free

7
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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