Wheeled type distance measuring apparatus

Abstract

The invention relates to a wheeled range finder, comprising a handle and a hand grip on the handle. The lower part of the handle is fixed with a wheel seat, and a rotatable measuring wheel is arranged on the side of the wheel seat. The range finder is characterized in that: a magnetic steel element is fixed on the side of the measuring wheel; a hall induction sensor matched with the magnetic steel element is fixed inside the wheel seat; an output of the hall induction sensor is connected with a control circuit; an output of the control circuit is connected with a display screen on the hand grip. The range finder matches the magnetic steel element with the hall induction sensor, can avoid the interference and influence from outside weather and foreign matter, and is little in measurement interference and higher in precision. In addition, the range finder automatically subtracts the reversing rotation distance of the measuring wheel from the present distance data, which is more convenient to use, reasonable and practical in integral structure design and easy to assemble and produce.

Description

technical field [0001] The invention relates to a wheel type distance measuring instrument. Background technique [0002] With the continuous improvement of people's living standards, distance measuring devices need to be used in many work and living occasions. For this reason, someone has designed a wheeled distance measuring instrument. For example, the Chinese patent "a wheeled rangefinder" with the patent No. 01254325.X includes a distance measuring wheel, a counter connected to the distance measuring wheel, a connecting rod and a handle are arranged on the distance measuring wheel, and it is characterized in that A hinge point is provided on the middle section of the connecting rod, and the connecting rod can be bent at this hinge. The connecting rod can be bent and is convenient to carry. The disadvantage is that the counter is only used for counting, which cannot be displayed and stored intuitively, and the counter is arranged near the wheel base, which is not easy ...

AI Technical Summary

Problems solved by technology

Its defect is that only the counter is used for counting, which cannot be displayed and stored intuitively, and the counter is set near the wheel base, which is not easy to observe, so it is not convenient to use

For example, the Chinese patent "rolling rangefinder" with the patent number of 03268560.2 is characterized in that it includes a roller, a push rod hinged with the middle part of the roller through a lower end cross bar, and a push rod fixed to the middle part of the roller with a through hole through the cross bar. The driving bevel gear, and the mechanical counting converter fixed on the lower part of the push rod; the input end of the mechanical counting converter is provided with a passive bevel gear driven by the driving bevel gear, and its defect is that the traditional Mechanical counters are not convenient enough for observation and storage, which affects their widespread use

[0003] Although there are some wheeled distance meters on the market that use a control circuit with a photoelectric sensor electronic counter, the problem is that due to the use of a photoelectric sensor circuit, it is easily affected by the outside weather or the light-emitting head is blocked by foreign objects. It is easy to cause measurement errors. In addition, the traditional photoelectric induction electronic counter generally uses a single sensor, so the measuring wheel is rotated forward to measure the distance, but not reversed, and the backward distance is deducted from the existing measurement data. , causing inconvenience in use, and further improvement of the design is required

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