UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
The Folded-Steel Trowel: A V-Trough Blade From One Sheet
A thin flat trowel bends when you lever out a weed with tough roots; a thick one is heavy.
William B. Cleves of Binghamton, New York, received US 441,135, dated 25 November 1890 (filed 30 December 1889), for a trowel whose blade and shank are one sheet of metal "bent upon itself to form an angular longitudinally straight trough-shaped" blade. "Forming the blade and shank angularly, as described, greatly strengthens it and at the same time presents a long slim blade."
This rung works out how much stiffer a folded strip is than a flat one, then bends two strips of the same sheet, one flat and one folded, and loads them.
Hagati
About 2 hours
Amabwiriza
1
1
Flat strip against folded strip
Flat strip against folded strip
Gupakira ikaye ya Jupyter…
2
2
Why shape beats thickness
Why shape beats thickness
The embedded blueprint shows how the shape of a section, not only its material, sets its stiffness. Cleves folds a sheet to get it.
3
3
Read US 441,135
Read US 441,135
"This invention has for its object to construct a trowel especially adapted for digging weeds and for cultivating purposes, wherein a strong blade is desired for prying and twisting."
"Forming the blade and shank angularly, as described, greatly strengthens it and at the same time presents a long slim blade."
The trowel "is especially adapted for digging plantains and other weeds having fibrous roots of great strength, and the particular form preferably employed increases the strength and decreases the weight."
4
4
Bend a flat and a folded strip
Bend a flat and a folded strip
Cut two identical strips from steel sheet. Leave one flat. Clamp the other along its middle in the vise and fold it to a V.
Clamp each at one end so the same length sticks out. Hang a weight from the free end and measure how far it drops with the ruler. Compare the two with the notebook's ratio.
Then dig out a deep-rooted weed with the garden trowel and note where it bends.
Ibikoresho by'iyi ntambwe:
Urupapuro rw'icyuma1 igiceIbikoresho bikenewe:
Ikayeri yo mu busitani
Ibyuma bikata ibyuma bisanzwe
Ifatiro ry'Ameza
Inyundo
Ikiremereza
Umurongo w'ipima5
5
A trowel that bends, twists or snaps
A trowel that bends, twists or snaps
Trowel troubleshooting.
Flow
Loading...
6
6
History and honest limits
History and honest limits
**William B. Cleves** of Binghamton, Broome County, New York, filed US 441,135 on 30 December 1889; it is dated 25 November 1890. The shank is driven into the handle and held by a pin.
**Honest limits.** The notebook treats the fold as sharp and the strip as uniform, and compares bending along the blade only. The strip size and angles are examples. Your measured deflections are the measurement.
Ibikoresho
1- 1 igiceUmwanya
Ibikoresho bikenewe
6- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Blueprint zijyanye
Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame
CC0 Umurenge rusange
Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.
Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.