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Mechanical Kitchen Scale: Sheet-Metal Case, Guided Plate and Two Springs to a Dial (Hansen, 1939)

أنشأه

Penny

2. نوفمبر 2026

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.

متقدم

3 days

التعليمات

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.

المواد لهذه الخطوة:

معدن غير معروف1 ورقة

لوح زجاج نافذة1 window

مينا الميزان ومؤشّره1 قطعة

ترس صغير1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

طقم زرّاديات

أبعاد غير معروفة

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.

المواد لهذه الخطوة:

معدن غير معروف1 ورقة

دبابيس1 طقم

نابض شد2 قطع

طقم نوابض ضغط1 one spring

براغي آلية1 zero bolt

صامولة سداسية1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

طقم زرّاديات

أبعاد غير معروفة

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.

المواد لهذه الخطوة:

معدن غير معروف1 ورقة

دبابيس1 طقم

الأدوات المطلوبة:

مقصّ صفائح

طقم زرّاديات

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.

المواد لهذه الخطوة:

معدن غير معروف1 ورقة

برشام فولاذي1 a few

الأدوات المطلوبة:

مقصّ صفائح

طقم زرّاديات

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.

المواد لهذه الخطوة:

براغي آلية1 rear plate screws

الأدوات المطلوبة: