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The Reusable Can Opener: A Stop on the Knife and a Rim Left to Use Again

Richard H. Atwell, Baltimore, Maryland · Public domain (expired patent)

أنشأه

YourGrandma

6. أكتوبر 2026

The Reusable Can Opener: A Stop on the Knife and a Rim Left to Use Again

A can hacked open is fit only to be thrown away. Richard H. Atwell of Baltimore, Maryland, received US 86,626, dated 9 February 1869, for a can opener: a bar at right angles to a handle that carries a piercer, a hook-shaped fulcrum pin in a hole made at the centre of the piece to be removed, a concave knife in one of several holes, and a stop that limits how far the knife goes in; the edges of the opening are so turned "as to adapt the can to be again used." This rung works out which hole leaves a usable rim, then builds the bar, pin, knife and stop and opens a can cleanly enough to refill.

متوسط

About 3 hours

التعليمات

Which hole leaves a rim

جارٍ تحميل دفتر Jupyter…

A centre-pivot cutter before it

The embedded blueprint cuts a round hole round a spike. Atwell adds a stop on the knife and turns the edge so the can is fit to use again.

Read US 86,626

"The edges of the opening made in the can are so turned, by this construction of knife, as to adapt the can to be again used." "A rest or stop, D, preferably cast on the bar, and arranged between the fulcrum a and knife C, limits the insertion of the knife, and thus prevents its hanging in the tin at its shank."

Make the bar and handle

Cut 90 mm of 25 × 3 mm flat bar and drill 5 mm holes 20, 28 and 36 mm from one end. Fix its other end at right angles into a hardwood handle with epoxy, and file a point on the handle's far end as the piercer.

المواد لهذه الخطوة:

قضيب فولاذ طري مسطّح1 قطعة

أوتاد من خشب صلب1 قطعة

إيبوكسي ثنائي المكوّن1 قطعة

الأدوات المطلوبة:

منشار حديد

مثقب تعليم المركز

مثقاب لاسلكي

طقم لقم ثقب

مبارد (مبرد يدوي)

Make the hook pin and stop

Bend 4 mm steel rod into a hook and fix it through the bar's end as the fulcrum pin. Epoxy a hardwood stop under the bar between the pin and the first hole, 4 mm deep.

المواد لهذه الخطوة:

قضيب فولاذ طري1 قطعة

كتلة خشب صلب1 قطعة

إيبوكسي ثنائي المكوّن1 قطعة

الأدوات المطلوبة:

ملزمة منضدة

مطرقة

منشار حديد

مثقاب لاسلكي

طقم لقم ثقب

Make the knife

Cut a knife from 1 mm steel sheet with a 5 mm shank, file its cutting edge concave and its flat side toward the pin. Fit the shank through a hole and nut it on top.

المواد لهذه الخطوة:

لوح فولاذ طري1 قطعة

صامولة سداسية1 قطعة

براغي آلية1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

مبارد (مبرد يدوي)

حجر شحذ

مفتاح ربط قابل للضبط

نظارة أمان شفافة

The patent drawing

US 86,626 drawing sheet, public domain (expired patent).

Open a can for reuse

Pierce the centre of a sealed can's top with the handle's point and hook the pin in. Press the knife through to the stop and turn the bar round once. Measure the rim left and run a finger-safe check along it with a rag.

المواد لهذه الخطوة:

علبة صفيح1 قطعة

الأدوات المطلوبة:

قدمة رقمية 6 بوصات

ساعة إيقاف

قفّازات عمل جلدية

A knife that hangs, wanders or leaves a ragged rim

Reusable can opener troubleshooting.

Flow

History and honest limits

**Richard H. Atwell** of Baltimore, Maryland, received US 86,626, dated 9 February 1869. His bar may be cast in one piece with the handle or hinged to it; the knife is held from lateral pressure and bending, its edge preferably concave so it need not be pressed down to its work. When the can is not to be refilled, part of the circle may be cut and the piece bent up. **Honest limits.** Epoxy and a hardwood stop stand in for his casting, and the knife is unhardened sheet. Your rim measurements are the result.