LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
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.
Miðlungs
About 2 hours
Leiðbeiningar
1
1
Flat strip against folded strip
Flat strip against folded strip
Hleð Jupyter-vinnubók…
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.
Efni fyrir þetta skref:
Stálplata1 stykkiNauðsynleg verkfæri:
Garðskófla
Plötuklippur
Skrúfstykki
Hamar
Lóð
Reglustika5
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.
Nauðsynleg verkfæri
6- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
Tengd Blueprint
Þessi blueprint deila þekkingu — tækni, efni eða meginreglur
CC0 opinbert ríki
Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.
Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.