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Crank-Point Can Opener: A Bent Point to Turn On, a Knife Set in a Slot
A can opened with a lever knife leaves a jagged hole of any size.
Samuel D. Lecompte of Leavenworth, Kansas, received US 50,011, dated 19 September 1865, for an instrument for opening fruit and other sealed cans: a bar with a handle, its end bent like a crank and pointed so that, thrust through the top, the bent part is held by the edges of the hole as a bearing; a knife slides along a slot in the bar on a set screw, and the instrument is turned round to cut.
This rung works out where to set the knife for each can, then forges the bar, crank and knife and cuts a round opening.
中级
About 3 hours
说明
1
1
Knife position for each can
Knife position for each can
正在加载 Jupyter 笔记本…
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2
A lever opener before it
A lever opener before it
The embedded blueprint saws round a can with a lever knife. Lecompte gives the knife a centre to turn about and a slot to set its radius.
3
3
Read US 50,011
Read US 50,011
"The end of the instrument is bent somewhat in the form of a crank, and pointed, as shown by the letters b c in Fig. 1. This enables the instrument to be thrust into the top of the can in such manner that the part c, which is bent at right angles to the bar A, will be encircled by the edges of the hole made in the top of the can, thus insuring a good and sufficient bearing to enable the instrument to be operated."
4
4
Slot the bar
Slot the bar
Cut 170 mm of 25 × 3 mm flat bar. Drill a row of 5 mm holes along its centre from 25 to 70 mm from one end and file them into a slot.
此步骤所需材料：
低碳钢扁钢1 个所需工具：
钢锯
台虎钳
中心冲
充电式电钻
钻头套装
什锦锉套装
直尺5
5
Forge the crank point
Forge the crank point
File the bar's slotted end down to 6 mm wide for its last 30 mm. Bend it down 15 mm, along 10 mm, and down again 15 mm in the vice, and file the end to a sharp point.
所需工具：
锉刀（手用锉）台虎钳
锤子
透明安全眼镜6
6
Make the knife
Make the knife
Cut a 6 × 25 mm knife from 1 mm steel sheet with a pointed lower end and a 5 mm hole at the top. Hone its edge.
此步骤所需材料：
低碳钢板1 个所需工具：
铁皮剪充电式电钻钻头套装锉刀（手用锉）
磨刀石7
7
Fit the knife and handle
Fit the knife and handle
Bolt the knife under the slot with an M5 screw, washer and nut as the set screw. Fit a hardwood handle to the bar's other end with epoxy.
此步骤所需材料：
机螺钉1 个
平垫圈1 个
六角螺母1 个
硬木销钉1 个
双组分环氧胶1 个所需工具：
活动扳手充电式电钻钻头套装8
8
The patent drawing
The patent drawing
US 50,011 drawing sheet, public domain (expired patent).
9
9
Cut a round opening
Cut a round opening
Set the knife for the can and tighten it. Stand a sealed can on the kitchen scale, thrust the point through the top's centre, press the knife in and turn round; read the peak load, time it, and measure the hole.
此步骤所需材料：
马口铁罐1 个所需工具：
数字厨房秤
秒表
6 英寸数显卡尺
皮革工作手套10
10
A point that tears out, a knife that slips
A point that tears out, a knife that slips
Crank-point can opener troubleshooting.
Flow
Loading...
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11
History and honest limits
History and honest limits
**Samuel D. Lecompte** of Leavenworth, Kansas, received US 50,011, dated 19 September 1865, for cans used for fruits, preserves and oysters. He did not limit himself to one knife shape, having adopted various styles. The patent was reissued on 4 February 1868 (No. 2,851). F. S. Wyman's 1868 patent names it as the circular opener he added a side knife to.
**Honest limits.** A bolt and nut stand in for his set screw, and the knife is unhardened. Your loads and times are the result.
材料
8- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
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