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Digital Kitchen Scale: a Cantilever Load Cell in a Sealed Dual Housing (Edlund, 2009)
A digital scale built to survive a kitchen: spills, washing and being dropped. The load cell is a short cantilever with a strain sensor on top, and the electronics sit in a sealed compartment. Both are in a plastic chassis held loosely inside a second, outer housing of stainless steel and plastic, with crushable spacers between the two.
Result: a digital kitchen scale with a removable pan, sealed display and touchpad, battery power and an overload stop under the load cell.
Source: R. S. Whitney (Edlund Company), US Patent 7,554,043 (2009). Unknown: sizes, capacity, resolution and the electronics; the patent says suitable force transducers are readily available. Ours: the display and button types. Picture: Wikimedia Commons.
Abantado
2 days
Mga Tagubilin
1
1
Mount the cantilever load cell
Mount the cantilever load cell
In the load-cell cavity of the plastic chassis, screw a base plate to the cavity floor. Screw the cantilever support to the base plate; a support plate on the cantilever carries the posts for the pan. A strain transducer on top of the cantilever senses the top stretching as it bends under a load. A window in the base plate leaves the cavity floor just below the free end, so an overload bottoms out there instead of breaking the transducer.
Mga materyales para sa hakbang na ito:
Load cell1 cantilever type
Plastik1 chassis
Mga turnilyo ng makina1 setMga kailangang kasangkapan:
Set ng mga distornilyador
Hindi alam na sukat2
2
Seal in the electronics
Seal in the electronics
On the other side of the chassis, fit the display electronics behind one opening and the touchpad electronics behind another, wired to the strain transducer through sealing bushings. Fit a battery holder. Close the compartment with its cover on gaskets, so the electronics stay dry. Not given: the circuit, the display and the battery. Ours: a segment LCD and push buttons.
Mga materyales para sa hakbang na ito:
Integrated circuit (IC)1 weighing and display electronics
Segment LCD panel1 piraso
Pindutan1 touchpad keys
Baterya1 piraso
Gasket na pansara2 piraso
Kawad na pandugtong1 short
Kawad na Panghinang1 a littleMga kailangang kasangkapan:
PanghinangSet ng mga distornilyador3
3
Close it in the outer housing
Close it in the outer housing
Place the chassis, unfastened, between the two halves of the outer housing: a stainless-steel top with downturned sides, and a plastic bottom. Spacers moulded on the chassis sides press against the housing sides. They take a blow if the scale is dropped, and may crush on purpose to save the load cell and electronics. A sealed window of plastic or glass shows the display. A flexible sheet covers the touchpad. Fit four height-adjustable feet.
Mga materyales para sa hakbang na ito:
Plantsang asero na hindi kinakalawang1 upper housingPlastik1 lower housing
Hindi kilalang materyal1 window, touchpad sheet, four feetMga kailangang kasangkapan:
Set ng mga distornilyadorHindi alam na sukat4
4
Fit the pan and check
Fit the pan and check
Screw the pan support to the four supports of the load cell. Rest the removable pan on it, or snap it on, so it lifts off for washing. A flexible boot can seal each support where it passes through the housing. Ours: check the reading with calibration weights.
Mga materyales para sa hakbang na ito:
Pinggan ng Timbangan1 metal or plasticMga turnilyo ng makina1 setMga kailangang kasangkapan:
Set ng mga distornilyador
Set ng timbang na pangkalibrasyonMga Materyales
13- 1 cantilever typePlaceholder
- 1 lower housingPlaceholder
- Placeholder
- 1 weighing and display electronicsPlaceholder
- 1 pirasoPlaceholder
- Placeholder
- 1 pirasoPlaceholder
- 2 pirasoPlaceholder
- 1 shortPlaceholder
- 1 a littlePlaceholder
- 1 upper housingPlaceholder
- 1 window, touchpad sheet, four feetPlaceholder
- 1 metal or plasticPlaceholder
Mga Kinakailangang Kasangkapan
4- Placeholder
- Placeholder
- 2 vendors sell this, none ship to you yetPlaceholder
- Placeholder
Mga Materyales ng Nakakonektang Blueprint
10% Atribusyon
Mechanical Kitchen Scale: Sheet-Metal Case, Guided Plate and Two Springs to a Dial (Hansen, 1939)
ni Penny
Mekanika
5
0
0
0
1
0
10% Atribusyon
Electronic Baby Scale That Holds a Steady Reading: Hino & Itani, 1981
ni Penny
Electronics
26
0
0
0
2
0
10% Atribusyon
Strain-Gauge Load Cell with Floating Piston: Ruge, 1949
ni Penny
Electronics
28
0
0
0
3
0
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