JPH0212631Y2 - - Google Patents

Description

[Detailed explanation of the invention] () Purpose of the invention Industrial application field This invention relates to a sundial that can be easily assembled using paper or other materials, and is characterized by adjustment according to latitude differences. Because it is equipped with a mechanism, it is possible to know the most accurate time depending on the location of the person using it.

Prior Art Although the principle of the sundial has been known since time immemorial, it has not yet been forgotten and can often be seen as monuments in parks or as educational materials for children.

These sundials that we see every day simply consist of an observation board with a rotating time scale and an indicator board. However, when observing accurate time using a sundial, you must be careful when using the same sundial in different regions, that is, at different latitudes and longitudes. Differences in longitude can be corrected by calculations that correspond to standard time, but since the height of the sun's rise changes from moment to moment depending on its latitude, the time indicated by a sundial is naturally affected by latitude, and may not be accurate in a certain region. Even so, there will be considerable errors in other regions. This difference in latitude is approximately 18 degrees from north to south across Japan, resulting in a considerable error.

In other words, conventional sundials like this one could not be used in a wide area, and could only accurately indicate the time if they were specific to the region. In fact, in the case of stationary monuments, the angle of inclination of the triangular or other indicator board to be erected on the display board was determined in advance, and the corresponding time scale was added later.

Problems that the invention aims to solve The aim of this invention is to create something that can be easily assembled, and of course requires that it can be used anywhere in Japan.

With such mass production, it is impossible to create time scales for specific regions.

Therefore, in this invention, the time scale and indicator board are all set to the same value, and an easy-to-operate latitude adjustment mechanism is installed in this device, making it possible to accurately observe the time in any region of the country. .

() Structure of the invention Specific means for solving the problem The bottom plate is provided with a time scale, and the observation board with the indicator board standing upright within the scale is bent into a dogleg shape along a fold line, and the angle of this bending is The assembly type is determined by fixing to the back side of the display board an adhesive part that stands upright from the bottom plate and bends through a plurality of latitude adjustment fold lines that can be selected as appropriate depending on the latitude of the region in which it is used inside. It's a clock.

In other words, we made it possible to always know the exact time by tilting the observation board, which has a scale and an indicator board, at a fixed angle from the installation surface, and also adjusting it according to the difference in latitude.

Example The present invention will be explained in detail below according to the drawings. What is shown in the drawings is one embodiment of the present invention.
Bottom plate 1, observation plate 2, and fixed plate 3 that can be folded into two
are sequentially connected via broken lines ₁ and ₂ . The bottom plate 1 is formed by a fold line ₃ extending perpendicularly from the fold line ₁ as a starting point, and a cutting line c connecting both ends of the fold line ₃ from the side direction. A pair of inclined plates 4 having a plurality of latitude adjustment folded lines a... are arranged symmetrically.

Next, there is a time scale 5 on the top of the observation board 2. Each scale of the time scale 5 is set by using a line extending from the lower end of the fixed plate 3 by a length equal to the height of the indicator plate 6 (described later) as a reference line, and extending 360 degrees left and right from the reference line and the upper end of the reference line. Lines that extend radially at intervals of 15 degrees, which is the angle per hour divided into 24 hours, are set by extending downward at right angles using the points where they touch the upper end of the observation plate 2 as reference points. And the scale extending from the starting point of the reference line is
It is 12 o'clock, and from this scale the scale on the left changes to 11.
The hour is 10 o'clock... and the right side is 1 o'clock, 2 o'clock, etc. Also, if you want to set a scale at 30-minute intervals, you can set the time as you like, just by halving the angle of the radially extending lines on the fixed plate to 7.5 degrees.

The bottom plate 1 of the board mentioned above and the observation plate 2 are on a broken line.
₁ in a dogleg shape, and overlaps with observation plate 2,
The attached fixing plate 3 is bent at right angles along the fold line ₂ . At this time, the inclination angle of the bottom plate 1 and the observation plate 2 is determined by a fold line selected from among the latitude adjustment fold lines a of the inclined plate 4 that stand upright within the bottom plate 1 via the fold line ₃ , the one closest to the latitude of the area to be used. This is determined by attaching and fixing the bendable adhesive part to the back side of the observation plate 2.

An indicator plate 6, which is provided separately and has a rectangular shape whose lower side is approximately equal to the vertical length of the time scale 5 and has a protruding tip, is placed on the scale indicating 12 o'clock on the observation plate 2 and on the reference line of the fixed plate 3. Then, after the indicator plate 6, the present invention is completed by engaging the locking protrusion 7 provided on the lower side with the locking notch 8 provided on the scale and the reference line.

The above embodiment is relatively strong and has an excellent design, but it can also be made simpler. For example, the fixing plate can be folded in half to cover and hide the locking protrusion of the indicator plate, giving it a beautiful appearance. Even if you don't show it,
Even if it is just a single plate, the fixed plate can perform its function perfectly. Also, it is not necessary to provide this fixed plate itself, and if it is not provided, the force to maintain the indicator plate in an upright position will be weakened, but since the time scale is actually determined at the design stage, it will not have a big effect. not.

There are many other possible forms of inclined plates.
In addition to the door shape, it can also be simply rectangular, or it can be provided as a separate member.

In addition, the effect created by the indicator plate of the sundial of the present invention is that the indicator plate is set in a rectangular shape, that is, the upper side is horizontal to the observation plate.
It is strip-shaped and is much easier to see than the shadow created by the conventional triangular indicator board.

() Effects of the invention This invention is a sundial that can be assembled with very simple operations such as folding and pasting plate-like members such as paper.Furthermore, the angle at which the observation board is tilted is set on the slanted board. By determining the time using the latitude adjustment line, you can always know the exact time, eliminating errors due to latitude, no matter where you use it.

[Brief explanation of the drawing]

What is shown in the drawings is one embodiment of the present invention; Fig. 1 is an assembled perspective view, Fig. 2 is a plan development view, and Fig. 3 is an explanatory drawing showing the assembled state. 1...Bottom plate, 2...Observation plate, 4...Slope plate, 5
... Time scale, 6 ... Indication board, ₁ to ₃ ... Broken line, a ... Latitude adjustment broken line.

Claims (1)

[Scope of utility model registration request] A bottom plate and an observation plate having a time scale inside and an indicator plate rising perpendicularly from the time scale are bent in a dogleg shape along a fold line, and further provided inside an inclined plate that stands up from the bottom plate. , an assembly type sundial comprising an adhesive part that is bent to the back surface of the observation plate through an arbitrarily selected one of a plurality of latitude adjustment broken lines that can be appropriately selected according to the latitude.