SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Dial Spring Scale with Tare Screw: Fray & Pigg, 1881
John S. Fray and Horace Pigg of Bridgeport, Connecticut, patented this weighing scale in 1881, US 243,539. A dish sits on the standard of a frame hung on two pairs of cross-arms, so it moves straight up and down. A coil spring on a right-angle lever carries the load, and a rack on the frame turns a pinion carrying the pointer round the dial. To take up the tare, a screw rod through the front of the case moves the lever's lower end. Because the spring hangs vertically from the lever's horizontal arm, the adjustment is more sensitive and the bearing surfaces fewer.
Kati
Workshop process
Maagizo
1
1
Case and frame
Case and frame
Make the upright case with removable front and top. Cast or otherwise form the frame with a standard that passes up through the top to the weighing dish, and pivot it on upper and lower cross-arms whose other ends pivot to the back of the case.
Vifaa kwa hatua hii:
Kasha la mizani1 kipande
Fremu ya mizani yenye mikono ya kukingama1 kipande
Sahani ya kupimia1 kipandeZana zinazohitajika:
Seti ya bisibisi2
2
Spring and lever
Spring and lever
Pivot the right-angle lever at the back of the frame. Hang the coil spring from its horizontal arm and connect the spring's lower end to the frame by a screw, so the tension can be regulated.
Vifaa kwa hatua hii:
Nyenzo ya pembe mraba1 kipande
Springi ya koili ya mizani1 kipandeZana zinazohitajika:
Seti ya bisibisi3
3
Rack and dial
Rack and dial
Journal the pinion in a bracket so its front end passes through the dial plate and carries the pointer. Pivot the rack bar to the frame and keep it in mesh with a light spring, so the frame's descent turns the pointer.
Vifaa kwa hatua hii:
Upau wa meno na pinioni1 kipande
Uso na mshale wa mizani1 kipandeZana zinazohitajika:
Seti ya bisibisi
Seti ya koleo ndogo za usahihi4
4
Tare screw
Tare screw
Pass the tare rod horizontally through the front of the case into a threaded opening in the lever's lower end, so turning it sets the pointer to zero with the container on the dish.
Vifaa kwa hatua hii:
Kijiti cha hesi cha kuondoa uzito wa chombo1 kipandeZana zinazohitajika:
Seti ya kukata nyuzi za skrubuVifaa
8- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
Zana Zinazohitajika
3- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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