JPH02141789A - Terrestrial globe - Google Patents

Abstract

PURPOSE:To form a ring body in a proper and stable shape at low cost by constituting the ring body by coupling endlessly two or four arcuate pieces in the same shape which are curved arcuately and have scales on both top and reverse surfaces. CONSTITUTION:The ring body 2 of the terrestrial globe is constituted by connecting endlessly two or four arcuate pieces 5 in the same shape which are curved arcuately over a specific angular range and have the scale on both top and reverse surfaces. The size of a mold required to molding each arcuate piece 5 can be reduced greatly as compared with a mold required to mold the ring body 2. Consequently, the manufacture cost of the ring body 2 is saved and the ring body 2 in the proper shape can be formed stably.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a terrestrial globe.

(Prior Art) In a globe whose sphere has a relatively large diameter, the sphere rotates relative to a cast iron ring (also called a bow) fixed upright to the end of the support and formed into an annular shape. It is supported by a syllable and attached inside the ring body.

(Problems to be Solved by the Invention) In the case of the above-mentioned globe, since the diameter of the ring body increases in proportion to the size of the sphere, there are problems in that a large die-casting mold is required to mold the ring body. Since the ring body shrinks and becomes distorted after molding, there is a problem in that it is difficult to mold a ring body having an appropriate and stable shape.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The ring body of the globe of the present invention has two or four equally-shaped arc pieces each curved in an arc shape over a predetermined angular range and having scales displayed on both the front and back sides. It has a structure in which the front and back sides are alternately reversed and connected in an endless manner.

(Function) The ring body of the globe is divided into two or four equal-shaped arc pieces each curved in an arc shape over a predetermined angular range and each having an angular scale displayed on the front and back surfaces, and then divided into two or four equally shaped arc pieces, each of which is curved in an arc shape over a predetermined angular range, and placed adjacent to each other. An endless ring body is produced by connecting the two circular arcs C with their end portions overlapped with each other, respectively.

(Effects of the Invention) Since the present invention is configured as described above, the size of the mold required for molding each arc piece is significantly reduced compared to the mold required for molding the ring body. Therefore, the manufacturing cost for producing the ring body can be reduced.

Further, there is an effect that a ring body having an appropriate shape can be stably manufactured.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

Mounting bracket 4.4 for the earth (an annular ring body 2 stands upright on the top end of iG's support base 1, and inside the ring body 2 there is a sphere 3 on which a map of the entire earth is displayed) The axis of rotation is inclined by 23.56 L! i′r- [Supported so that it can be rotated.

The ring body 2 is formed by die-casting and is curved into an arc over an area of 110', and is divided into four equal-shaped cast iron arc pieces 5 to 5 formed by dividing the ring body 2 into four equal parts.
are connected in an endless manner with their respective ends overlapped.

Ribs 17 and 17 each having a semicircular cross section are formed on the inner and outer ends in the width direction of both side surfaces 5a and 5b of each arcuate piece 5 to protrude flatly along the longitudinal direction. Near both ends in the longitudinal direction of each arcuate piece 5, a first connecting part 6 is recessed so that the thickness is 172 mm over an angular range of 20 degrees with respect to one side surface 5a and the opposite side surface 5b. Second
The connecting portion 7 is formed symmetrically. Moreover, protrusions 18 to 18 arranged in the longitudinal direction at intervals of 10[deg.] are formed protrudingly formed in the shape of a square trapezoid between the inner and outer ribs 17 on both side surfaces 5a and 5b of each arcuate piece 5, respectively. However, the width of the protrusion 18 at the end on the side of the first connecting part 6 and the width of the protrusion 18 at the end on the side of the second connecting part 7 are 172 times the width of the other protrusions 18 .

Each connecting portion 6.7 of each circular arc piece 5 is fastened with the first connecting portions 6 of two adjacent circular arc pieces 50 overlapped, and both box 2 connecting portions 7 of two adjacent circular arcs P150 are fastened together. Two screw holes 8.8 for inserting the screws 20 to be fastened in an overlapping state are provided respectively, and two circular arc pieces 5 are provided in the center of the inner surface of the second connecting portion 7. An insertion groove 10 having a semicircular cross section is provided to form a circular through hole 19 through which the shaft of the mounting bracket 4 is inserted when the connecting parts 7 of both boxes 2 are overlapped and fastened. Each is recessed along the width direction.

On one side 5a of each arcuate piece 5, an angle scale 9 of "0" is displayed on the surface of a protrusion 18 disposed near the outer edge 11 of the first connecting part 6, An angle scale 9 of 1-OJ indicating the equatorial position, that is, Oo, is displayed on the surface of the protrusion 18 located 10 degrees away from the outer edge 11, and 20 degrees, 30 degrees, etc.・80°i11
On the surface of each protrusion 18, rlol indicates the angle from the equator.

r20J, ... Each angle scale 9 of "70" is displayed, and furthermore, a scale of "8" is displayed on the surface of the protrusion 18 disposed near the inner edge 12 of the second connecting portion 7. ing.

At the opposite side 5b of each arc M' 5, the first connecting portion 6
A scale of "I"1" is displayed on the surface of the protrusion 18 disposed near the inner edge 13 of the
“2010
Angular scales 9 are displayed, each measuring 20 degrees from the inner edge 13.
° 30° 40°... On the surface of each protrusion 18 spaced 80" apart, r30J, r40J, r50J,...
Each angle scale 9 of "90" is displayed, and furthermore, a scale of rOJ is displayed on the surface of the protrusion 18 disposed near the outer edge 14 of the second connecting portion 7. That is, the same angle scale 9 is displayed at the same position on both side surfaces 5a and 5b of each arc 5 so that the angle gradually increases from the first connecting part 6 side to the second connecting part 7 side.

In each arc piece 5, a portion approximately 23.5° inward from the angle scale 9 of 0°, which displays 0°, that is,
Between the angle scales 9 of "20" and "30" and approximately 23. ! Thickened portions 15 and 15 with increased wall thickness are formed between the angle scales 90 of "70" and "60" that are i' apart, respectively. When supporting the ring body 2 at both ends of an arc of about 180°, this thick part 15 is provided at the upper end and left and right ends of the ring body in order to drill a screw hole in this thick part 15. They are arranged respectively.

Then, while the four arcs r15 are alternately turned inside out, the connecting portions 6 of the two cylinders 1 of the two adjacent arc pieces 5 are overlapped and tightened in the thickness direction, and both of the two adjacent arc pieces 5 are tightened. When the tubes 2 connecting portions 7 are overlapped in the thickness direction and tightened, each arc C 5 forms two pairs of 13th! An annular ring body 2 is formed by being endlessly connected via the connecting portion 6 and the two pairs of second connecting portions 7 .

On one side of the ring body 2, there is a mark [11] displayed on the end of the rI side 5a of the arc 5 on the side of the first connecting part 6, and on the opposite side 5b of the arc piece 5 adjacent to this arc piece 5. The rOJ scale displayed on the side end of the first connecting part 6 is adjacent to each other, and the angle scale 9 of [10] is displayed at the connecting position of the two-cylinder 1 connecting part 6, and One side 5a
The scale of "8" near the end on the second connecting part 7 side and the 23rd! on the opposite side surface 5b of the arcuate piece 5 adjacent to this arcuate piece 5!
The "0" scale on the opposite side of the connecting part 7 is adjacent to each other, and the connecting position of the connecting part 7 of the two cylinders has an "80" angle f! Scale 9 is displayed.

The ring body 2 was attached to the support base 1 via the thick part 15 so that the angle scale 9 of [0] was inclined at 23.5 degrees with respect to the horizontal plane, and the sphere 3 was inserted into the attachment hole 9. The ring body 2 is rotatably mounted via the mounting bracket 4 so that the two rOJ angle scales 9 face the equator, and the two 190" angle scales 9 face the north and south poles, respectively. I get kicked. However, the ring body 2 may be divided into four equal parts at any angular position. Further, the ring body 2 may be divided into two equal parts.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, the ring bodies 2 of earth f7 & G are each 900
Divide into four equally shaped arc pieces 5 which are curved in an arc shape over the above angle range and have angle scales 9 displayed on both sides 5a and 5b, and alternately flip each arc piece 5 upside down, They are connected endlessly to form a ring body 2.

Therefore, the size of the arc piece 5 is approximately 174 times the size of the ring body 2, and the size of the die-casting mold required for forming the circular arc 5 is smaller than that of the die-casting mold necessary for forming the ring body 2. It can be significantly reduced in size, and the manufacturing cost of the ring body 2 can be reduced.

Furthermore, since the ring body 2 is formed by connecting the four circular arc pieces 5, each circular arc piece 5 can be accurately molded to optimize and stabilize the shape of the ring body 2.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a ring body, FIG. 2 is a T-plane view of a globe, FIG. 3 is a plan view of an arcuate piece, and FIG. 4 is a back view. , Figure 5 shows the X in Figure 1.
6 is an enlarged sectional view taken along the line X2-X2, FIG. 7 is an enlarged sectional view taken along the line X3-X3 of FIG. 3, and FIG. , FIG. 9 is an enlarged sectional view of the same <X5X5F11, and FIG. 10 is an exploded perspective view of the ring body. 2...Ring body 5...Circle arc Piece 9...Angle scale G...Earth

Claims (1)

[Claims] Equipped with a ring body in which two or four equally-shaped arcuate pieces, each curved in an arc shape over a predetermined angular range and each having a scale displayed on both the front and back sides, are connected in an endless state with the front and back reversed alternately. A globe characterized by