JPH043202Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a bifoldable ruler.

(Prior Art) The so-called foldable ruler has been known for some time as a "folding shaku", but the connection of each ruler constituent plate is described in, for example, Japanese Utility Model Application Publication No. 123602/1983. As described, a simple method was used in which the two were rotatably fixed using a support shaft.

(Problem to be solved by the invention) However, with this structure, as each ruler component plate is repeatedly opened and closed, the mounting portion of the axis becomes loose, making it difficult to open each ruler component plate to the required angle. There is a risk that it will not be possible to use it for purposes such as holding it as it is, and to prevent this, for example, one ruler component plate should be provided with an arc-shaped shape centered on the support shaft, as described in the above-mentioned publication. A long hole is provided, and a bolt that fits into the long hole and can slide is planted in the other ruler component plate, and a rotation stopper mechanism for each ruler component plate that can be fixed with a nut is attached. There were some problems, such as the need to

(Means for Solving the Problems) The present invention consists of a pair of upper and lower discs 2, 2' having round holes 1, 1' in the center provided at the bases of left and right ruler constituent plates 12, 12', respectively; A ring-shaped shaft portion 3 concentric with the round hole 1' that protrudes from the upper surface of the side disc 2' and is rotatably fitted into the round hole 1 in the upper disc 2; a ring-shaped protrusion 4 concentric with the round hole 1 protruding from the upper surface of the ring-shaped protrusion 4; and a ring-shaped protrusion 4 formed by cutting off the inner periphery of the upper part of the ring-shaped protrusion 4.
A ring-shaped stepped portion 5 is provided on the inner peripheral surface, and a hook portion 7 thereof is erected on the upper surface of the ring-shaped shaft portion 3 so as to face in the radial direction, and the hook portion 7 is slid onto the ring-shaped stepped portion 5. A bridle-shaped member 8 is inserted into a space surrounded by a large number of hook-shaped locking arms 6 that are freely engaged, and a bridle-shaped member 8 is inserted into the space surrounded by the hook-shaped locking arms 6, and A large number of wing-like pieces 9 whose tips are oriented in the radial direction, and a large number of hook-shaped locking legs 1 whose hook portions 11 provided on the lower edge of the bit-shaped member 8 are oriented in the radial direction.
0, and the wing-shaped piece 9 of the bit-shaped member 8 is attached to the upper surface of the ring-shaped protrusion 4, as well as the hook part 1 of the hook-shaped locking leg 10.
The present invention attempts to solve these problems by providing a ruler characterized in that the rulers 1 and 1 are slidably engaged with the lower surface of the incisal edge of the lower round hole 1.

(Embodiment) In the embodiment shown in the figure, a pair of upper and lower hard plastic discs 2, 2' having round holes 1, 1' in the center are superposed, and a round hole 1' is formed on the upper surface of the lower disc 2'. A concentric ring-shaped shaft portion 3 is integrally protruded, and the shaft portion 3 is rotatably fitted into the round hole 1 in the upper disk 2. A ring-shaped protruding edge 4 concentric with the ring-shaped protruding edge 4 is integrally provided, and the upper inner periphery of the ring-shaped protruding edge 4 is cut off to form a ring-shaped stepped portion 5 on the inner circumferential surface of the ring-shaped protruding edge 4. Further, a large number of hook-shaped locking arms 6 are integrally erected on the upper surface of the ring-shaped shaft portion 3 with their hook portions 7 facing in the radial direction. The shaft portion 3 is inserted into the round hole 1 by slidably engaging the portion 7 with the ring-shaped stepped portion 5.
Further, a hard plastic bit-shaped member 8 is inserted into the space surrounded by the hook-shaped locking arm 6, and the hook portion 7 is rested on the outer peripheral surface of the bit-shaped member 8. A large number of wing-like pieces 9 whose tips point in the radial direction are integrated on the outer periphery of the upper edge of this bit-shaped member 8, and a large number of hook-shaped locking legs 10 with hook portions 11 oriented in the radial direction are integrated on the lower edge. The wing-like pieces 9 are provided on the upper surface of the ring-shaped ridge 4, and the hook portions 11 of the hook-like locking legs 10 are slidably engaged with the lower surface of the incisal edge of the lower round hole 1, respectively, and the upper surface of the above-mentioned Disk 2
And on the outer periphery of the lower disk 2', there are left and right ruler constituent plates 12,
12' is integrally provided in a direction parallel to the tangent line of the same outer periphery, and the upper and lower surfaces of these left and right ruler constituent plates 12, 12' are on the same plane, and the inside sides 13, 13' are also aligned with the tangent line above. Parallel round holes 1,
Similarly, the proximal sides 14, 14' are on the center line of the round holes 1, 1' which are perpendicular to the same tangent line, and on the upper surfaces of the inner and outer edges of the left and right ruler constituent plates 12, 12'. Dimensional scales 15 and 15' are engraved on the upper surface of the outer periphery of the upper disc 2, and an angle scale 17 centered at the intersection 16 of the cross points of the bridle-shaped member 8 is engraved on the upper surface of the outer periphery of the upper disc 2. A large number of small holes 18 are formed in a row at predetermined intervals on the inner edge of the left ruler component plate 12 extending from the lower disk 2', and the right ruler component plate 12 extending from the lower disk 2' has a large number of small holes 18 arranged in a row at predetermined intervals. An indicator 19 of the angle scale 17 described above is provided at the base end of the inner edge.

(Operations and effects of the invention) Since the invention is as described above, each ruler component board 1
2 and 12' are integrated upper and lower discs 2 and 2' that engage the hook part 7 of the lower disc 2' with the ring-shaped stepped part 5 of the upper disc 2, and of the bridle-shaped member 8. Hook part 11 on the lower edge
and the upper side of the hook 7 due to engagement with the lower incisal edge of the ring-shaped shaft 3 of the lower disk 2' and pressing the hook 7 outward with the outer peripheral surface of the bit-shaped member 8. The upper and lower discs 2, 2' are integrated by a multiple locking mechanism such as forcibly retaining the engagement of the disc 2 with the ring-shaped stepped portion of the upper disc 2, and as a result, both ruler-constituting plates 12 are integrated. . It is not necessary to add a folding angle holding mechanism to this, and the present invention has the effect of being able to sufficiently solve the above-mentioned problems.

[Brief explanation of the drawing]

The figure shows an example of the ruler of the present invention,
Fig. 1 is a perspective view showing the whole, Fig. 2 is an exploded perspective view of main parts, Fig. 3 is a sectional view taken along line A-A in Fig. 1,
FIG. 4 is a plan view showing the long state, and FIG. 5 is a plan view showing the state partially bent. 1, 1'... Round hole, 2, 2'... Disc, 3... Shaft, 4... Projection, 5... Step, 6... Locking arm, 7
... hook part, 8 ... bit-shaped member, 9 ... pterygium,
10... Locking leg, 11... Hook portion, 12, 12'...
...Construction plate, 13,13'...Inner side, 14,1
4'...Proximal side, 15, 15'...Dimension scale, 16
...Intersection, 17...Angle scale, 18...Small hole, 1
9...Indicator.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower discs 2, 2' having circular holes 1, 1' in the center provided at the bases of the left and right ruler constituent plates 12, 12', respectively, and a lower disc 2' that protrudes from the upper surface and is provided on the upper side. a ring-shaped shaft part 3 concentric with the round hole 1' rotatably fitted into the round hole 1 in the disc 2;
A ring-shaped protrusion 4 concentric with the round hole 1 protruding from the upper surface of the upper disc 2, and an inner peripheral surface of the ring-shaped protrusion 4 formed by cutting off the inner circumference of the upper part of the ring-shaped protrusion 4. A ring-shaped stepped portion 5 and a hook portion 7 thereof are erected on the upper surface of the ring-shaped shaft portion 3 so as to face in the radial direction, and the hook portion 7 is slidably engaged with the ring-shaped stepped portion 5. A large number of joined hook-shaped locking arms 6, a bridle-shaped member 8 inserted into the space surrounded by the hook-shaped locking arms 6, and a bridle-shaped member 8 provided on the outer periphery of the upper edge of the bridle-shaped member 8. A hook portion 1 is provided on the lower edge of the bit-shaped member 8 as well as a large number of wing-like pieces 9 whose tips face in the radial direction.
1 has a large number of hook-shaped locking legs 10 facing in the radial direction, and the wing-like pieces 9 of the bit-shaped member 8 are attached to the upper surface of the ring-shaped flange 4 with the hook portions 11 of the hook-shaped locking legs 10. A ruler characterized in that the ruler is slidably engaged with the lower surface of the incisal edge of the lower round hole 1.