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The Lid-Lifting Can Opener: One Lip Presses Down While the Other Lifts
O. J. Livermore, Worcester, Massachusetts · Public domain (expired patent)
YourGrandma

Creato da

YourGrandma

6. ottobre 2026IS
39
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The Lid-Lifting Can Opener: One Lip Presses Down While the Other Lifts

A fruit can's tin cover, pressed onto a rubber ring, can stick so hard that prising it off hurts the fingers. O. J. Livermore of Worcester, Massachusetts, received US 55,878, dated 26 June 1866, for a can opener for "Lyman's patent can": a handle, a part that passes over the cover with an inclined lip below it, and a curved piece whose angular edge goes under the cover's far side; raising the handle presses one side down and lifts the other. This rung compares the force holding a vacuum-sealed lid with what the lever gives, then bends the opener from flat bar and lifts a sealed jar lid with it.
Principiante
About 2 hours

Istruzioni

1

Holding force against lever force

Caricamento del notebook Jupyter…
2

A sealed jar before it

The embedded blueprint seals food in a screw-top jar. Livermore's lever lifts a pressed-on cover of the same kind without fingernails.
3

Read US 55,878

"In trying to remove the cover under such circumstances persons without proper conveniences at hand for the purpose often injure their fingers and nails." "Handle B is now raised, which causes the inclined lip D to force the cover down and toward the can on that side, while the angular lip a elevates the other side of the cover, as shown in red lines."
4

Bend the head

Cut 220 mm of 25 × 3 mm flat bar. Bend the last 15 mm down at about 60° in the vice for the inclined lip, 30 mm from it bend the bar level again: the part over the cover.

Materiali per questo passaggio:

Piatto di acciaio dolcePiatto di acciaio dolce1 pezzo

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
Morsa da bancoMorsa da banco
MartelloMartello
RighelloRighello
Pennarello indelebilePennarello indelebile
Guanti da lavoro in pelleGuanti da lavoro in pelle
5

Add the lifting piece

Cut 60 mm of the bar, curve it on the anvil, and file one end to a sharp angular edge. Drill both pieces and screw the curved one under the bar, its edge 70 mm from the lip.

Materiali per questo passaggio:

Piatto di acciaio dolcePiatto di acciaio dolce1 pezzo
Viti da metalloViti da metallo1 pezzo
Dado esagonaleDado esagonale1 pezzo

Strumenti necessari:

Seghetto per metalliSeghetto per metalli
IncudineIncudine
MartelloMartello
Lime (lima a mano)Lime (lima a mano)
Bulino da centroBulino da centro
Trapano a batteriaTrapano a batteria
Serie di punte da trapanoSerie di punte da trapano
Chiave regolabile a rullinoChiave regolabile a rullino
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
6

The patent drawing

US 55,878 drawing sheet, public domain (expired patent).
Passo 6 - Image 1
7

Seal a jar and lift its lid

Fill a Mason jar with water from the kettle at the boil, put on a new flat lid, screw the band on and let it cool for two hours so the lid pulls down. Then remove the band. Try to lift the lid with the force meter's hook under its edge; note the force. Then set the opener on it and lift with the meter on the handle's end.
Passo 7 - Image 1

Materiali per questo passaggio:

Vasi da conserva (Mason)Vasi da conserva (Mason)1 pezzo
AcquaAcqua1 pezzo

Strumenti necessari:

Bollitore da fornelloBollitore da fornello
Dinamometro (bilancia a molla)Dinamometro (bilancia a molla)
Guanti resistenti al caloreGuanti resistenti al calore
8

An opener that slips, bends or scratches

Lid-lifting can opener troubleshooting.

Flow

Loading...
9

History and honest limits

**O. J. Livermore** of Worcester, Massachusetts, assignor to himself and Clark, Sawyer & Co., received US 55,878, dated 26 June 1866. Lyman's cover fits over a rubber packing ring in a groove on the can; a groove lets a pin admit air, but the cover often adheres by corrosion and other causes. His opener works even before the air is admitted, though more easily after. **Honest limits.** A cooled Mason jar stands in for Lyman's can, and two screwed pieces for his one-piece tool. Your forces are the result.

Materiali

5

Strumenti richiesti

16

Questo progetto realizza

Thumbnail
Segnaposto

Apriscatole manuale

Free

7
0

Blueprint correlati

Questi blueprint condividono conoscenze — tecniche, materiali o principi

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CC0 Pubblico dominio

Questo progetto è rilasciato sotto CC0. Sei libero di copiare, modificare, distribuire e utilizzare quest'opera per qualsiasi scopo, senza chiedere permesso.

Supporta il Maker acquistando prodotti tramite il suo progetto dove guadagna una Commissione Maker stabilita dai venditori, oppure crea una nuova iterazione di questo progetto e includilo come collegamento nel tuo progetto per condividere i ricavi.

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