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The Single-Blow Can Opener: A Ring of Pointed Teeth Punches the Hole
Cutting into a can with a single blade takes several cuts or blows.
Thomas A. McFarland of Meadville, Pennsylvania, received US 64,891, dated 21 May 1867, for "a cheap, simple, and effective implement for cutting an opening in a can by a single blow": a ring of curved pointed teeth on a handle's head, bevelled inside, whose points enter first and whose edges widen until they meet, punching out a plug that stays inside the cutter.
This rung works out why pointed teeth need so little force, then files the teeth on a steel tube and punches a can top with one blow.
中级
About 3 hours
说明
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1
Peak force and work
Peak force and work
正在加载 Jupyter 笔记本…
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A single blade before it
A single blade before it
The embedded blueprint cuts a can top a slit at a time with one blade. McFarland rings the blade round into teeth so one blow cuts the whole opening.
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Read US 64,891
Read US 64,891
"In operation the tool is placed on the head of the can, and the points of the teeth driven in by a smart blow, and the cutters forced down until their forks or bases have cut through the can, when a piece will have been cut out of the form of the cutters."
"The teeth being bevelled on the inside tend to compress the plug removed, and cause it to remain inside the cutter, thus facilitating its removal from the can."
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Cut and mark the tube
Cut and mark the tube
Cut 40 mm of 25 mm steel tube. Mark six teeth round one end, 12 mm tall, their bases touching.
此步骤所需材料：
结构钢管1 个所需工具：
钢锯
台虎钳
油性记号笔
直尺5
5
File the teeth
File the teeth
Saw a V between each pair of marks and file the teeth to points. Bevel each tooth's inside edge with a round needle file; leave the outside flush.
所需工具：
钢锯
锉刀（手用锉）
什锦锉套装台虎钳
透明安全眼镜6
6
Fit the handle
Fit the handle
Sand a hardwood dowel to fit the tube's other end, glue 20 mm of it in with epoxy, and leave 100 mm as the handle.
此步骤所需材料：
硬木销钉1 个
双组分环氧胶1 个所需工具：
砂纸
6 英寸数显卡尺7
7
The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: a 25 mm steel tube with six 12 mm pointed teeth bevelled inside, on a hardwood handle.
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Punch a can top
Punch a can top
Stand a sealed can on a hardwood block. Set the teeth on its top and strike the handle once with the mallet; count the blows needed, and measure the plug with the caliper.
此步骤所需材料：
马口铁罐1 个
硬木块1 个所需工具：
橡胶锤6 英寸数显卡尺
皮革工作手套透明安全眼镜9
9
Teeth that bend, skid or leave the plug
Teeth that bend, skid or leave the plug
Single-blow can opener troubleshooting.
Flow
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History and honest limits
History and honest limits
**Thomas A. McFarland** of Meadville, Pennsylvania, received US 64,891, dated 21 May 1867, for opening oyster, fruit and other cans. The cutters are curved to fit a shoulder on the handle's head and fastened by screws; they may be one piece or sections. He disclaimed cutting an opening broadly, single shear-like cutters, and cork borers with spring handles, and claimed the handle and cutters cutting a plug at a single blow.
**Honest limits.** Mild steel tube is not hardened; the notebook's shear figures are estimates. Your blow counts are the result.
所需工具
11- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
- 占位符
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