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The Lifting-Cutter Can Opener: A Diagonal Blade Cuts Under and Holds the Disk

William L. Hubbell, Brooklyn, New York · Public domain (expired patent)

أنشأه

Forge

6. أكتوبر 2026

The Lifting-Cutter Can Opener: A Diagonal Blade Cuts Under and Holds the Disk

A can opener's knife can slip out of its cut, and the cut disk drops into the can. William L. Hubbell of Brooklyn, New York, received US 69,996, dated 22 October 1867, for a can opener made of a lever with a screw spike that fits any of several holes, to vary the size of the disk, and a cutter set diagonally "so as to cut under and lift up the said disk, and prevent the knife slipping out while in use," holding the disk until it is taken from the can. This rung works out which hole suits which can, then builds the lever, spike and diagonal cutter and opens a can.

متوسط

About 3 hours

التعليمات

Spike hole against can size

جارٍ تحميل دفتر Jupyter…

A turning cutter before it

The embedded blueprint cuts round a can with a wheel and a fixed cutter. Hubbell turns a lever round a spike and inclines the cutter so it lifts what it cuts.

Read US 69,996

"The cutter d is set into a recess, formed by grooves, on the edges of the lever a, at the curved part b, so that one edge of the cutter projects below the under side of the lever at an inclination, as shown, so that the cutter is prevented from rising by its being below, and inclining inwards under the edge of the disk that is being cut out by revolving either the can or the opener."

Make the lever

Cut 180 mm of 25 × 3 mm flat bar and bend the last 20 mm down at about 40° in the vice. Drill and tap three M5 holes 25, 30 and 35 mm from the bend's foot.

المواد لهذه الخطوة:

قضيب فولاذ طري مسطّح1 قطعة

الأدوات المطلوبة:

منشار حديد

ملزمة منضدة

مطرقة

مثقب تعليم المركز

مثقاب لاسلكي

طقم لقم ثقب

طقم أدوات قطع اللولب

مسطرة

Slot the bent end

Saw a slot 1 mm wide and 12 mm deep across the bent end at 25° to the bar with the hacksaw.

الأدوات المطلوبة:

منشار حديد

ملزمة منضدة

طقم مبارد إبرية

Make and set the cutter

Cut a 16 × 18 mm cutter from 1 mm steel sheet and file both short ends to rounded cutting edges. Set it in the slot with epoxy so one end projects 5 mm below the bar, inclined inward.

المواد لهذه الخطوة:

لوح فولاذ طري1 قطعة

إيبوكسي ثنائي المكوّن1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

مبارد (مبرد يدوي)

حجر شحذ

نظارة أمان شفافة

Make the spike

File the end of an M5 screw to a long taper point. Screw it into the hole that suits the can.

المواد لهذه الخطوة:

براغي آلية1 قطعة

الأدوات المطلوبة:

ملزمة منضدة

مبارد (مبرد يدوي)

The patent drawing

US 69,996 drawing sheet, public domain (expired patent).

Open a can and lift the disk

Stand a sealed can on the kitchen scale. Thrust the spike into the top's centre, press the cutter through and turn the lever round; read the peak load and time it. Lift the opener and see whether the disk comes with it.

المواد لهذه الخطوة:

علبة صفيح1 قطعة

الأدوات المطلوبة:

ميزان مطبخ رقمي

ساعة إيقاف

قدمة رقمية 6 بوصات

قفّازات عمل جلدية

A cutter that rides up, slips or drops the disk

Lifting-cutter can opener troubleshooting.

Flow

History and honest limits

**William L. Hubbell** of Brooklyn, New York, signed his specification on 16 August 1867; US 69,996 is dated 22 October 1867. He wrote that earlier openers with semicircular knives, or tools to perforate and raise the edges, were costly and some were liable to slip. The cutter's edge is rounded outwardly so as not to draw the spike out, and both ends are shaped alike so it can be changed end for end. **Honest limits.** Epoxy in a sawn slot stands in for his grooved recess, and the cutter is unhardened. Your loads and times are the result.