ART
BEAUTÉ ET BIEN-ÊTRE
ARTISANAT
CULTURE ET HISTOIRE
DIVERTISSEMENT
ENVIRONNEMENT
NOURRITURE ET BOISSONS
INGÉNIERIE INVERSE
SCIENCES
SPORTS
TECHNOLOGIE
TECHNOLOGIE PORTABLE
Half-Round Can Opener: Push the Cutter In and Twist
Opening a sardine box or tin with a flat knife takes many strokes and leaves a ragged edge.
Seth P. Chapin of Atlantic, New Jersey, received US 56,368, dated 17 July 1866, for an implement for opening sheet-metal cans and boxes: a cutter semicircular in section with sloping edges to a point, bevelled inside, on a handle; forced in nearly to the handle and twisted, it cuts a circle the size of its own curve, and a guard at its top keeps it in position and stops it going too deep.
This rung works out how many twists a hole takes, then files the cutter from steel tube and opens a can.
Débutant
About 2 hours
Consignes
1
1
Twists for a full circle
Twists for a full circle
Chargement du notebook Jupyter…
2
2
A cutter turned round before it
A cutter turned round before it
The embedded blueprint shears tin round a wheel. Chapin bends the blade into a half-tube so twisting it cuts a circle.
3
3
Read US 56,368
Read US 56,368
"The said edges a are beveled upon their inner side to make them sufficiently sharp, and the implement is used for cutting circular holes in the tin box by forcing it, point first, into and through the sheet metal nearly up to the end of the handle A, and then turning or twisting the cutter around by means of the said handle, which causes the foremost of the edges a to cut the thin metal in a circular line corresponding to the circle of which the back or convex side of the cutter forms an arc."
4
4
Cut the half tube
Cut the half tube
Cut 45 mm of 25 mm steel tube and saw it in half lengthwise. Keep one half.
Matériaux pour cette étape :
Tube d'acier1 pièceOutils nécessaires :
Scie à métaux
Étau d'établi
Marqueur permanent
Règle5
5
Shape the point
Shape the point
File both long edges to slope in to a point at one end, over the last 25 mm. Bevel them inside with a round needle file and hone.
Outils nécessaires :
Limes (lime à main)
Jeu de limes aiguilles
Pierre à aiguiserÉtau d'établi
Lunettes de sécurité transparentes6
6
Guard and handle
Guard and handle
Epoxy a large flat washer across the cutter's top as the guard, and a hardwood handle above it.
Matériaux pour cette étape :
Rondelle plate1 pièce
Goujons de bois dur1 pièce
Époxy à deux composants1 pièceOutils nécessaires :
Papier abrasif7
7
The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: a 25 mm half-tube cutter with sloping edges to a point, the washer guard and the hardwood handle.
8
8
Twist out a hole
Twist out a hole
Stand a sealed can on the kitchen scale. Force the point through the top until the guard meets it, then twist round; count the twists, read the peak load and measure the hole.
Matériaux pour cette étape :
Boîte de conserve1 pièceOutils nécessaires :
Balance de cuisine numérique
Pied à coulisse numérique 6 pouces
Chronomètre
Gants de travail en cuir9
9
A cutter that will not enter, wanders or jams
A cutter that will not enter, wanders or jams
Half-round can opener troubleshooting.
Flow
Loading...
10
10
History and honest limits
History and honest limits
**Seth P. Chapin** of Atlantic, Monmouth County, New Jersey, received US 56,368, dated 17 July 1866, for opening tin or other sheet-metal boxes in circles or straight or irregular lines. Widened at its widest part, the cutter cuts a larger part of a circle or oval at one thrust, leaving a piece easily bent over; another form has one edge flattened for sardine boxes, and a metal handle with a cross-piece for turning. Wyman's 1868 patent names it.
**Honest limits.** A washer stands in for his guard, and the tube is unhardened. Your twist counts are the result.
Matériaux
5- 1 pièceEspace réservé
- 1 pièceEspace réservé
- 1 pièceEspace réservé
- 1 pièceEspace réservé
- 1 pièceEspace réservé
Outils requis
13- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
Fichiers de conception
1Blueprints liés
Ces blueprints partagent des connaissances — techniques, matériaux ou principes
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.