Mechanical floor scales
Mechanical floor scales – device for measuring body weight. The name comes from the mechanical design. Scales are intended for domestic use. They do not have additional functions, like some electronic models. But they became the first measuring instruments and took a firm position in the world of scales.
Advantages and disadvantages
Mechanical adaptations are necessary to control body weight. They show the correspondence of weight to height and age – the state of human health.
Advantages of mechanical floor scales:
- the cost is low;
- no special storage conditions required;
- understandable to any person;
- work does not depend on electricity, batteries;
- easy to use;
- long service life.
Disadvantages of mechanical floor scales:
- no additional features;
- limitation of the weight of the weighed person.
The device of mechanical floor scales
Mechanical scales are a device consisting of a platform and a body. The upper part is equipped with a scale protected by a plastic or glass coating.
The movable platform consists of four fixed legs, four metal arms connected in pairs, a horizontal plate, a spring and a rocker arm. The rocker is connected to the arrow, monitors the tension of the spring, changes the position of the arrow.
The basis of the design is represented by a measuring spring, which is stretched when weighed. Spring – measuring element. The sensing element is attached to a horizontal plate.
When gravity (an object, a person) acts on the scale platform, the spring goes down. Stretching changes the value of the arrow on the dial.
It is easy to use mechanical scales. To begin with, it is installed on a flat, even, hard surface. This eliminates the error that will occur when the balance is placed on a carpet or soft surface.
If it is necessary to carry out regular weighings with fixation of exact changes in body weight, the device is installed in the same place, since when moving there is a risk of being placed on an uneven surface.
The scale control is set to zero. To make sure that the hand is set correctly, pay attention to the colored or bold mark on the dial, indicating the beginning of the reckoning.
Get on the device carefully. First, put one foot, make sure that it is stable, does not stagger. Then move the other leg.
To accurately determine body weight, weighing is recommended to be carried out at the same time of day, shoes and clothes should be removed. The procedure is carried out 2 hours after waking up. If you weigh yourself after eating, the indicators will not be accurate, so it is better to carry out the procedure before eating or after a few hours.
Types of mechanical floor scales
The most common type for home use. Easy to use. It is enough to install them correctly and you can start weighing. Affordable, strong and durable. When choosing this unit, check it for error. To do this, you need to weigh an object whose mass is precisely determined, for example, a package of salt. Various models show from 100 to 500 grams.
Mechanical scales are used to determine the weight of sick people, patients who are undergoing rehabilitation.
Weighing is carried out by two scales that must be adjusted. Clamp (special lever) when weighing releases the rocker (part of the lever mechanism).
By moving the weight along one scale, it is necessary to achieve an equal level. Once this is done, the exact same process is repeated for the fine scale. The value is read from both scales of floor mechanical scales and summed up.
This scale is not intended for home use. Since the dimensions are large, and the unpresentable appearance is unlikely to fit the design of the house. There are floor options with a stadiometer. With them it is convenient to immediately calculate the correspondence of height and weight.
Similar to medical scales, but more accurate. A distinctive feature is the increased area of the platform. Its surface is made of durable steel, it is very smooth.
They are even larger in size. They measure from hundreds of kilograms to hundreds of tons.
Location of industrial models:
- transport control point;
How to choose a mechanical bathroom scale
The choice of weights is determined by the expected weight of the measurement. The device for home use determines the weight from 1 to 150 kilograms. The maximum figure reaches 250 kg.
Depending on the size of the platform, material, type of dial, as well as the availability of additional accessories, the weight of the scales changes. Compact scales weigh about a kilogram. More massive fixture – 2 kg +/- 0.5 kg.
At the bottom of the device are equipped with legs, usually there are four of them. They act as a support. Legs are made of plastic or metal. Sometimes they are rubberized, which provides additional protection against slipping.
The markup of most models is calculated in one kilogram, allocate scales with marks of 0.5 kg.
Some models have an electronic display, but the mechanism of action is still the same spring. The deviation is measured by a special sensor.
The accuracy of this is established during production, reaching an error value of ten or one hundred parts of a kilogram. Readings are much easier.
The weight of the scales, appearance, service life depend on the composition of the case.
If the case is made of metal, it is more durable, resistant to mechanical stress. The cost will be much higher.
Plastic are characterized by a long service life if the plastic is of high quality. But the composition of the case will not provide protection against damage from drops, shocks. And low-quality breaks under the weighed person.
The presence of a rug
Some models are equipped with a corrugated pad, a person does not slip when weighing.
Viewing window material
There are two types of display coating – glass or plastic. Plastic is prone to clouding, scratching. Over time, the appearance will deteriorate and it is difficult to look at the scale. Tempered glass stays clear longer.
The model range is represented by scales with different sizes of numbers. For vision problems, choose a large dial with large numbers. Better with red markings.
The height-weight chart helps to determine the state of physical fitness. With the help of special marks (colored markers) the previous weighing result is saved or the value of the present weight is fixed. This feature is useful when comparing body weight measurements.
The standard shapes are circle and square. There is also oval, rectangular and triangular. A wide range of colors is possible.
Connecting elements fell out
The body is fastened with two metal parts, which fall out when the sash is pulled apart. Reason: they are held by the force of squeezing parts of the body. To install them back, the scales are disassembled and the dropped elements are put in their original places in the grooves. The cover is put in place.
Scales determine the weight incorrectly
- The measuring spring forms the basis of the mechanism. It stretches in proportion to the weighed mass. If the weight is indicated incorrectly, but naturally, you can do without repair. Set the amount of error, subtract extra pounds with each measurement.
- Adjustment is made with a tuning screw. If you turn it, the scale values will change in any direction. Thus, the measurement is normalized. The arrow after weighing shows zero. When the initial weight readings change each time, the problem is with the spring. Such a malfunction is eliminated only with a new spring.
The weighing mechanism is stuck
If at the same time the shoulders or the base bent, then the reason is the excess of the permitted mass. The case is carefully disassembled and the damage is eliminated by restoring the parts. To do this, use a hammer, vice, anvil. It is necessary to straighten the bent part not inside, but after removing it.
Failure of load-bearing parts
If the allowed weight is exceeded, the legs are damaged and they need to be replaced.
How to use
- Do not allow children to play.
- Installed away from heat sources.
- Storage temperature +10 to +35 degrees.
- Do not immerse in water or other liquids.
- Do not use grease-dissolving agents.
- Do not overload as it will fail.
- Protect from blows, shocks, do not throw.
- When storing, do not place objects on top.
- Stand straight on the machine with both feet.
Cleaning and care
Maintenance is simple, regular care will help keep it in excellent condition.
- The use of abrasive cleaners is not recommended.
- Do not wash in dishwasher.
- In case of heavy soiling, apply a small amount of detergent, then wipe with a damp cloth, without immersing the unit in water or under running water.
- Do not allow water to enter the platform – the surface will become slippery, which will lead to a fall.
- Store in a dry place protected from direct sunlight.
- After use, wipe it with a damp cloth.
- Avoid immersion in water, they will fail.
- Do not jump, it will damage the measurement mechanism and other parts.
- Use by children or people with health problems is permissible only under the supervision of persons ensuring safety.
Mechanical scales are a reliable tool for determining body weight at home. If used correctly, they will last a long time.
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