CN201165138Y - Expansion ruler - Google Patents

Abstract

The utility model relates to a telescopic straight ruler, comprising a strip-like ruler bar which is a hollow structure; openings are arranged at the short edges of both sides of the ruler; two small ruler bars are inserted into the strip-like ruler bar; a plurality of hemispherical rubber lugs are processed in order on the horizontal midlines of the small ruler bars; round locking holes are arranged on the midlines of the ruler bars and near the openings at both ends; the diameter of the lugs is equal to that of the locking holes. When in use, the user can normally use the straight ruler to measure the straight lines. Once the length of the straight ruler is insufficient, the user can draw the small ruler bars out of the strip-like ruler bar to increase the length. The telescopic straight ruler has the advantages of simple structure, beautiful appearance and reasonable process, and is convenient and practical.

Description

Expansion ruler

Technical field

The utility model relates to a kind of measurement drawing instrument, especially a kind of Expansion ruler.

Background technology

As everyone knows, ruler is linear measure longimetry, a drawing tool the most frequently used in people's study and work.But present ruler function is fairly simple, and structure length immobilizes, and can't change length according to actual needs, brings very big inconvenience to people.For this reason, we provide a kind of Expansion ruler very necessary.

Summary of the invention

The purpose of this utility model provides a kind of Expansion ruler, is used to solve the problem that common ruler can't be adjusted length.

For achieving the above object, the utility model Expansion ruler comprises strip chi bar, and the chi bar is a hollow-core construction, and minor face place in both sides is provided with opening, assigns two little chi bars in addition in the chi bar; On little chi bar transversal centerline, process a plurality of hemispherical rubber bumps in turn, offer circular hole clipping everywhere near both ends open at chi bar center line, and projection and hole clipping equal diameters.

After adopting said structure, the user can normally use the chi bar to measure and draw straight line.In case length is not enough, the user can extract little chi bar out from the chi bar, when adjusting, depress the hemispherical projections on the little chi bar, the little chi bar of move left and right enters new fixing when next projection snaps in hole clipping then, if length is still not enough, taking aforesaid operations just can.

The utility model has the advantages that: simple in structure, convenient and practical, good looking appearance, technology are reasonable, can arbitrarily adjust length, satisfy people's work requirements.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model Expansion ruler.

The specific embodiment

As shown in Figure 1, the utility model Expansion ruler comprises strip chi bar 1, and chi bar 1 is a hollow-core construction, and minor face place in both sides is provided with opening 2, assigns two little chi bar 1-1 in addition in chi bar 1; On little chi bar 1-1 transversal centerline, process a plurality of hemispherical rubber bumps 3 in turn, offer circular hole clipping 4 near 2 places, both ends open place at chi bar 1 center line, and projection 3 and hole clipping 4 equal diameters.

Claims (1)

1, a kind of Expansion ruler comprises strip chi bar (1), it is characterized in that: chi bar (1) is a hollow-core construction, and minor face place in both sides is provided with opening (2), assigns two little chi bars (1-1) in addition in chi bar (1); On little chi bar (1-1) transversal centerline, process a plurality of hemispherical rubber bumps (3) in turn, locate to offer circular hole clipping (4) near both ends open place (2) at chi bar (1) center line, and projection (3) and hole clipping (4) equal diameters.

Images