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The Pivot-Point Can Opener: A Spike at the Centre, a Blade Set to the Size
Charles Messenger, Cleveland, Ohio · Public domain (expired patent)
Martin

Créé par

Martin

6. octobre 2026NO
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The Pivot-Point Can Opener: A Spike at the Centre, a Blade Set to the Size

A knife driven round a can top wanders, and leaves a ragged hole of no particular size. Charles Messenger of Cleveland, Ohio, received US 70,010, dated 22 October 1867, for a tool for opening sheet-metal cans: a plate fixed in a handle, a pointed rod at its end thrust through the centre of the top as a pivot, and a blade slipped on the rod through one of several holes in the plate, held by a ring; turning the handle round cuts a round hole, small or large. This rung works out the hand force for each hole size, then builds the plate, pivot and blade from steel and opens a can.
Intermédiaire
About 3 hours

Consignes

1

Hole size and hand force

Chargement du notebook Jupyter…
2

A turning cutter before it

The embedded blueprint cuts tin with a turning wheel against a fixed cutter. Messenger turns the whole tool round a centre spike.
3

Read US 70,010

"The apparatus is held in the right hand, and the point C' thrust through the centre of the top of the can. The handle is then brought down so as to cause the blade to penetrate the cover; the instrument is turned around the circumference of the top, the point acting as a pivot, and the handle as a lever; the blade, as the instrument turns, will cut out a round hole through which the contents of the can may be emptied."
4

Make the plate

Cut 90 mm of 25 × 3 mm flat bar. Drill a 5 mm hole 6 mm from one end for the rod, and three 4 × 8 mm slots at 30, 45 and 60 mm from it for the blade. File the slots square.

Matériaux pour cette étape :

Plat en acier douxPlat en acier doux1 pièce

Outils nécessaires :

Scie à métauxScie à métaux
Étau d'établiÉtau d'établi
PointeauPointeau
Perceuse sans filPerceuse sans fil
Jeu de foretsJeu de forets
Jeu de limes aiguillesJeu de limes aiguilles
5

Make the rod and blade

Cut 100 mm of 5 mm steel rod, file one end to a sharp point, and thread the other M5. Cut the blade from flat bar, drill it for the rod, and file its lower end to a cutting edge.

Matériaux pour cette étape :

Rond en acier douxRond en acier doux1 pièce
Plat en acier douxPlat en acier doux1 pièce

Outils nécessaires :

Scie à métauxScie à métaux
Limes (lime à main)Limes (lime à main)
Jeu de tarauds et filièresJeu de tarauds et filières
Perceuse sans filPerceuse sans fil
Jeu de foretsJeu de forets
Pierre à aiguiserPierre à aiguiser
6

Assemble

Push the rod through the plate's end hole so the point stands 12 mm below. Slip the blade on the rod and down through a slot; hold both with a nut on the rod's thread. Fit the plate into a hardwood handle with epoxy.

Matériaux pour cette étape :

Écrou hexagonalÉcrou hexagonal1 pièce
Goujons de bois durGoujons de bois dur1 pièce
Époxy à deux composantsÉpoxy à deux composants1 pièce

Outils nécessaires :

Perceuse sans filPerceuse sans fil
Jeu de foretsJeu de forets
Pince platePince plate
7

The patent drawing

US 70,010 drawing sheet, public domain (expired patent).
Étape 7 - Image 1
8

Open a can at two sizes

Stand a sealed can on the kitchen scale. Thrust the point into the centre, bring the handle down and turn it round; read the peak load and time a full circle. Move the blade to another slot and repeat.
Étape 8 - Image 1

Matériaux pour cette étape :

Boîte de conserveBoîte de conserve1 pièce

Outils nécessaires :

Balance de cuisine numériqueBalance de cuisine numérique
ChronomètreChronomètre
Gants de travail en cuirGants de travail en cuir
9

A cutter that wanders, tears or slips

Pivot-point can opener troubleshooting.

Flow

Loading...
10

History and honest limits

**Charles Messenger** of Cleveland, Ohio, received US 70,010, dated 22 October 1867, for opening oyster, paint and fruit cans. The ring slides on the rod and can be removed to change the blade; a knife with radial arms, each with two sharp edges, gives a spare edge when one is dull. His claim covers the rod, blade and ring in combination with the plate. **Honest limits.** A nut stands in for his sliding ring, and an unhardened blade for a steel one. Your loads and times are the result.

Matériaux

6

Outils requis

13

Blueprints liés

Ces blueprints partagent des connaissances — techniques, matériaux ou principes

Warner Can Opener

Warner Can Opener

par ForgeNO

ARTISANAT

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The Revolving Shear Can Opener: A Wheel and a Fixed Cutter That Cut Tin Like Shears

The Revolving Shear Can Opener: A Wheel and a Fixed Cutter That Cut Tin Like Shears

par ForgeNO

Travail des Métaux

12
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The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum

The Shouldered-Blade Can Opener: The Shoulders Are the Fulcrum

par ForgeNO

Travail des Métaux

8
0
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CC0 Domaine public

Ce blueprint est publié sous CC0. Vous êtes libre de copier, modifier, distribuer et utiliser ce travail pour tout usage, sans demander la permission.

Soutenez le Maker en achetant des produits via son Blueprint où il perçoit une Commission Maker définie par les Vendeurs, ou créez une nouvelle itération de ce Blueprint et incluez-le comme connexion dans votre propre Blueprint pour partager les revenus.

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