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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)

أنشأه

Forge

6. أكتوبر 2026

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.

متوسط

About 3 hours

التعليمات

Knife position for each can

جارٍ تحميل دفتر Jupyter…

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.

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."

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.

المواد لهذه الخطوة:

قضيب فولاذ طري مسطّح1 قطعة

الأدوات المطلوبة:

منشار حديد

ملزمة منضدة

مثقب تعليم المركز

مثقاب لاسلكي

طقم لقم ثقب

طقم مبارد إبرية

مسطرة

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.

الأدوات المطلوبة:

مبارد (مبرد يدوي)

ملزمة منضدة

مطرقة

نظارة أمان شفافة

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.

المواد لهذه الخطوة:

لوح فولاذ طري1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

مثقاب لاسلكي

طقم لقم ثقب

مبارد (مبرد يدوي)

حجر شحذ

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.

المواد لهذه الخطوة:

براغي آلية1 قطعة

حلقة تثبيت مسطحة1 قطعة

صامولة سداسية1 قطعة

أوتاد من خشب صلب1 قطعة

إيبوكسي ثنائي المكوّن1 قطعة

الأدوات المطلوبة:

مفتاح ربط قابل للضبط

مثقاب لاسلكي

طقم لقم ثقب

The patent drawing

US 50,011 drawing sheet, public domain (expired patent).

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.

المواد لهذه الخطوة:

علبة صفيح1 قطعة

الأدوات المطلوبة:

ميزان مطبخ رقمي

ساعة إيقاف

قدمة رقمية 6 بوصات

قفّازات عمل جلدية

A point that tears out, a knife that slips

Crank-point can opener troubleshooting.

Flow

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.