Distance-adjustable telescopic abacus

Abstract

The invention relates to an abacus, and in particular relates to a distance-adjustable telescopic abacus. By utilizing the instability of a parallelogram of the abacus, a plurality of isometric middle connecting rods are connected in sequence through hinge pins in a hinged manner; a handle is held firstly, and subsequently a left-handed screw rod and a right-handed screw rod are driven to rotate by rotating a rolling hand wheel; as a left-handed nut and a right-handed nut are respectively fixedly connected with a left-handed nut hinge pin and a right-handed nut hinge pin, the left-handed nut and the right-handed nut sleeving the left-handed screw rod and the right-handed screw rod can only move inwards or outwards simultaneously but not rotating, the abacus is driven by an upper tail end connecting rod and a lower tail end connecting rod to unfold and withdraw, the distance of two adjacent rows of abacus beads can be conveniently adjusted in an equal distance manner, the requirements of people of different ages in different use situations can be met, the plane with the abacus beads is positioned at the front end of the plane formed by a middle connecting rod; and as the abacus beads have certain height gaps, the abacus is convenient to use, can be unfolded or withdrawn to expected distance according to demands when being used, and is convenient to fold and carry over.

Description

technical field [0001] The invention relates to an abacus, in particular to a telescopic abacus with adjustable spacing. Background technique [0002] The abacus is a simple calculation tool invented and created by the working people. China is the hometown of abacus. Today, when computers are widely used, the ancient abacus has not been abandoned, but is in the ascendant in many countries because of its convenience and accuracy. As a tool for counting numbers, the abacus is rectangular in shape with a wooden frame around it and straight columns inside, commonly known as "files". Generally, from the ninth to the fifteenth stage, there is a beam in the middle of the file, two beads on the beam, and each bead counts as five, and five beads under the beam, and each bead counts as one. When calculating, dial the beads after positioning, and you can do addition, subtraction, multiplication, and division. and other algorithms. [0003] The existing abacus has a large volume, tak...

AI Technical Summary

Problems solved by technology

[0003] The existing abacus has a large volume, takes up a large space, is heavy, is not easy to carry, cannot be folded and stored, and the distance between the abacus beads cannot be adjusted, which brings a lot of inconvenience to users of different age groups and is not conducive to popularization and use.

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