Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Mechanical Kitchen Scale: Sheet-Metal Case, Guided Plate and Two Springs to a Dial (Hansen, 1939)
The everyday kitchen spring scale, built almost entirely from sheet metal. The platform hangs from a plate that two pivoted links keep moving straight up and down, the way Roberval's frame keeps a pan level. Two springs carry the load, and a rack turns the numbered dial behind a small window.
Result: a household scale that reads the true weight even when the food is put on one edge of the platform, because the dial is driven from the point midway between the two springs. It goes together from three units: case, weighing works and platform.
Source: M. H. Hansen (Hanson Scale Co.), US Patent 2,145,480 (1939). Unknown: the sheet metal and its sizes, the springs, the capacity and how the dial is marked. Picture: patent drawing.
Hejuru
3 days
Amabwiriza
1
1
Make the case and fit the dial
Make the case and fit the dial
Bend sheet metal into a U: a front wall and two side walls, the lower edges flared outward to stand steady, open at the top and back, with inturned flanges on the back edges. Cut a sector-shaped window in the front and glaze it. Fix a bracket across the side walls, and run the dial shaft from the front wall to the bracket. On the shaft goes the round dial, numbered on its face, and a pinion behind it. Fit a fixed pointer at the window. Not given: the metal, gauge and sizes, and how the dial is numbered.
Ibikoresho by'iyi ntambwe:
Icyuma kitazwi1 urupapuro
Ikirahure cy'idirishya1 window
Isura n'urushinge by'iminzani1 igice
Pinyoni1 igiceIbikoresho bikenewe:
Ibyuma bikata ibyuma bisanzwe
Agatsiko k'amafashi
Ingano zitazwi2
2
Build the guided plate on two springs
Build the guided plate on two springs
On a flat rear plate, pin two horizontal links: a lower rectangular one and an upper triangular one. Pin their front ends to an upright plate, which can now only move straight up and down. Hang the upright plate from two tension springs at its lower corners. Hook their tops to the arms of a U-shaped bracket pivoted on the rear plate. A bolt through the rear plate, with a compression spring and a nut, swings the bracket to set the zero.
Ibikoresho by'iyi ntambwe:
Icyuma kitazwi1 urupapuro
Udushinge two gufata1 ikirundo
Umusemburo ukururwa2 ibice
Ikusanyirizo ry'Imizingo Ikandamizwa1 one spring
Ibitorezo by'imashini1 zero bolt
Umupira w'Impande Esheshatu1 igiceIbikoresho bikenewe:
Ibyuma bikata ibyuma bisanzweAgatsiko k'amafashiIngano zitazwi3
3
Drive the dial from the middle
Drive the dial from the middle
Pivot an arm on the rear plate and join it by a short link to the upright plate at the pin midway between the two springs. If food sits off-centre, the platform tips and one spring stretches more, but the middle point moves by the average, so the arm gives the true weight. Pass the arm through a hole in the upright plate. Pin it to a curved rack cut in one piece with its extension, so a loose arm cannot skew the rack. The rack will mesh with the dial pinion.
Ibikoresho by'iyi ntambwe:
Icyuma kitazwi1 urupapuroUdushinge two gufata1 ikirundoIbikoresho bikenewe:
Ibyuma bikata ibyuma bisanzweAgatsiko k'amafashi4
4
Make the platform
Make the platform
Cut a rectangular sheet-metal platform with a flange turned down all round. Make the flange clear the case walls, so a tipped platform cannot rub and dirt stays out. Rivet a U-shaped bracket under it. Its two arms end in slotted hooks that drop into openings in the upright plate, held by its flanges so the platform cannot tilt on it.
Ibikoresho by'iyi ntambwe:
Icyuma kitazwi1 urupapuro
Utuma tw'icyuma1 a fewIbikoresho bikenewe:
Ibyuma bikata ibyuma bisanzweAgatsiko k'amafashi5
5
Assemble and set the zero
Assemble and set the zero
Lower the weighing works into the case through the open top: the rack drops into mesh with the dial pinion. Screw the rear plate to the case flanges. Hook the platform on. With the platform empty, turn the zero nut until the zero on the dial stands at the pointer. Turn it again later if the springs stretch. Ours: check the reading with a known weight.
Ibikoresho by'iyi ntambwe:
Ibitorezo by'imashini1 rear plate screwsIbikoresho bikenewe:
Ikusanyirizo ry'ibitorezi
IkiremerezaIbikoresho
10- 1 urupapuroUmwanya
- 1 windowUmwanya
- Umwanya
- 1 igiceUmwanya
- 2 ibirundoUmwanya
- 2 ibiceUmwanya
- 1 one springUmwanya
- 1 rear plate screwsUmwanya
- 1 igiceUmwanya
- 1 a fewUmwanya
Ibikoresho by'Ibishushanyo Bifitanye Isano
Iki gishushanyo gikora
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