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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.
初学者
About 2 hours
说明
1
1
Holding force against lever force
Holding force against lever force
正在加载 Jupyter 笔记本…
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2
A sealed jar before it
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.
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3
Read US 55,878
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."
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4
Bend the head
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.
此步骤所需材料：
低碳钢扁钢1 个所需工具：
钢锯
台虎钳
锤子
直尺
油性记号笔
皮革工作手套5
5
Add the lifting piece
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.
此步骤所需材料：
低碳钢扁钢1 个
机螺钉1 个
六角螺母1 个所需工具：
钢锯
铁砧锤子
锉刀（手用锉）
中心冲
充电式电钻
钻头套装
活动扳手
透明安全眼镜6
6
The patent drawing
The patent drawing
US 55,878 drawing sheet, public domain (expired patent).
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7
Seal a jar and lift its lid
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.
此步骤所需材料：
腌渍玻璃罐（Mason）1 个
水1 个所需工具：
炉灶水壶
测力计（弹簧秤）
耐热手套8
8
An opener that slips, bends or scratches
An opener that slips, bends or scratches
Lid-lifting can opener troubleshooting.
Flow
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9
History and honest limits
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.
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