JPH09257959A - Sundial - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sundial capable of seeing the time from the inside of window pane by mounting the sundial on the window pane not facing the south properly at the positions of different longitude and latitude. SOLUTION: A dial 11 of sundial having a top-like form is made of semi-transparent plate and thereby shadow thereon can be viewed from both sides thereof is used. The dial 11 is turned around an axis 40 and the difference with the longitude of Japan (135 degrees - the east longitude) is adjusted by a scale so that the sundial can be mounted on the glass pane of a building at a place with a different latitude. The sundial comprises further a support member 50 capable fo easily adusted at theangle so that the axis 40 faces the polar star; and a base member 60 with an universal joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sundial, which is attached to a window glass in a building with different latitude and longitude, and is useful for recognizing the time by observing the shadow from two directions of the front and back of a time display panel. Regarding sundial.

[0002]

2. Description of the Related Art A conventional top type sundial can be installed only on the same latitude and the time display panel is opaque.

[0003]

The time display board of the conventional top type sundial is made of an opaque material such as stone or metal, and the shadow on the north side of the time display board is observed during the period from spring equinox to summer solstice and autumn equinox. During the period from autumn equinox to winter solstice and spring equinox, the shadow on the south side of the time display board was observed, but the observer had to move north and south of the time display board. In addition, the conventional top type sundial was designed and installed for a fixed location, and did not support use at locations with different latitudes. This invention solves this drawback, and it is installed on a window glass facing the sun, where the glass of the window facing the sun is not facing right south, but is facing east or west. Even so, it is an object of the present invention to provide a sundial capable of recognizing the time of the sundial from the inside of the window glass, that is, from the inside or the outside of the room.

[0004]

In order to achieve the above object, the sundial 10 according to the present invention comprises a top type sundial section for observing the projection of the central axis 40 from both directions of a semitransparent time display panel 11. A support member 50 on which the central shaft 40 is mounted, and a universal joint base member 60 for mounting the support member 50 on the support member and mounting the central shaft 40 on the window glass 70 while holding the central shaft 40 parallel to the ground axis. Sundial composed of.

The above-mentioned "semitransparent" does not mean that the light transmittance is exactly 50%, but the light transmittance is such that the shadow of the projection stick appears on the surface of the time display board. It means having. Therefore, a reasonable range is allowed for the light transmittance of the time display board.

[0006]

In the sundial according to the present invention, even if it is attached to the window glass 70 which is installed in a building with different latitudes in a direction that is biased to the east and to the west, it tilts, turns, and turns. If the central shaft 40 of the top type sundial is installed parallel to the earth's axis with a swingable universal joint 61, the central shaft 40 can be attached to the time display panel 11.
The shadow 16 of the image is reflected on both sides of the board and can be observed both indoors and outdoors to recognize the time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a usage example of the sundial according to the present invention. The sundial 10 includes a time display board 11, a central shaft 40, a right-angled triangular support member 50 that supports the central shaft 40, and a universal joint base member 60 that attaches the right-angled triangular support member 50 to the window glass 10. Has been done.

FIG. 2 is an exploded perspective view of the sundial 10.

FIG. 3 is a plan view of the time display board 11. The front view is the side facing north when the sundial is installed. The line segment drawn every 15 degrees from the center of the disk is the hourly scale 12, which corresponds to the hourly movement of the shadow 16 of the central axis caused by the sun. The number 15 on the right end of the horizontally drawn diameter on the north side is 6 o'clock, and the numbers on the side are 4 o'clock, 5 o'clock, 6 o'clock, 7 o'clock, 8 o'clock, 9 o'clock in the clockwise direction.
Hours, 10:00, 11:00, 12:00, 1:00, 2:00, 3:00, 4
The hour, 5 o'clock, 6 o'clock, 7 o'clock, and 8 o'clock correspond to the numbers on the clock face. The small scale 14 between the one-hour scales 12 is 3 on the circumference.
It is 4 minutes if the sundial time is set to 1/60 or 1 degree. The concentric circle scale 13 inside the disk is a timekeeping scale for low sun altitudes. A small circle 20 at the center of the circle is a small hole through which the central axis of the sundial passes.
The rear view is the surface that faces south when the time display panel 11 is installed. Very thin white paint is applied. The shadow on the shoji screen can be seen both from the outside of the shoji screen and from the inside of the shoji screen, but the darkness is adjusted so that the shadow can be seen just as well. It may be a cloudy glass-like rough surface regardless of painting. There is a time display scale where the north side and the front side overlap. 19 is a side view of the time display board.

Reference numeral 40 in FIGS. 1 and 2 denotes a central axis of the time display board, which is fixed on the side AB of the right triangle support member 50. This length requires the shadow of the projection rod in the winter solstice to reach the inner scale of the time display. If the example is a sundial near Tokyo, the ratio of the length of the central axis to the length from the center of the time display panel to the time display scale is about 10: 6.
It is.

The two angles sandwiching the hypotenuse of the right-angled triangle type supporting member 50 change due to the different latitudes, but are 36 degrees and 54 degrees, respectively, for those used in the vicinity of Tokyo. . The material of the right-angled triangular support member 50 is optional, but colored transparent plastic is preferable. A notch 51 is formed at a right angle from the center of the side AB to this side, and the time display board 11 is inserted here at a right angle to the support member 50. In the notch 51, the time display board is centered on the central axis 40. It can be rotated. The difference between the longitude of the place where the sundial is installed and the 135 degrees east longitude of Japan Standard Time
Rotate the time display panel with 1 as the baseline to adjust the time difference between true sun time and Japan Standard Time. In this embodiment, the sundial is used in the vicinity of Tokyo, so a point on the west side of 4.7 degrees is found from the 12 o'clock line on the time display board, and this point is aligned with the notch 51. Japan Standard Time is 135 degrees east longitude and is defined as the meridian passing through Akashi city. Tokyo is 139.7 degrees east, and the earth rotates 4.7 degrees from the time when the sun was south in Tokyo to 135 degrees east longitude. It takes 19 minutes. In other words, when Akashi-shi is at noon, Sapporo, Tokyo, and Kagoshima all have clocks at 12 o'clock standard time, but that place is not in the middle of the sun. So, in the case of Tokyo, the 4.7 degree west scale is aligned with the line that produces a shade at 12:00 when the sun is true, that is, the notch 51 so that the shade at 12:00 GMT points to the noon of the time display. To

Reference numeral 60 in FIGS. 1 and 2 denotes a base member. 61 is a universal joint. A paper scissor type clip 62 is provided on one side of the universal joint 61, and the right triangular support member 50 is sandwiched by the clips 62, and a base member 63 is provided on one side and an adhesive is attached to the window glass. Or, the oblique side BC of the right-angled triangular support member 50 is vertically set by the function of tilting, rotating, and swinging of the universal joint which is attached by a suction cup instead of the adhesive, and the direction of the side AB is correctly directed to the polar star. Can be made. This is to position the center axis 40 of the top type sundial in parallel with the ground axis.

The sundial 10 of the present invention is used as follows. The window glass 70 facing the south, which is exposed to the sun, is attached with an adhesive or a suction cup. Hold the hypotenuse BC of the right triangle with the clip 61 so that it stands almost vertically.
Adjust the universal joint variable part so that the side B points to the north and south correctly. Shadow 16 of the central axis 40 of the top sundial made by the sun
Is displayed on the time display panel 11, so the time may be recognized. According to the embodiment, the colored and transparent support member is preferable because it is the function of the projection plate connected to the central axis.
This is because the colored transmitted light more beautifully directs the time than the dark monochromatic shade of the conventional sundial. Incidentally, it can be seen in FIG. 1 that the current time is 2:40 pm.

The support member 50 does not have to be a right-angled triangle as long as it has a function of mounting the central axis parallel to the ground axis. The graduation method of the time display board was the most difficult point in the design of the sundial, but since the time display graduation of this sundial is constant like the whole protractor scale, graduation drawing is easy, and the sundial part, support member, flexible If all the members such as the base member with a joint are simply enlarged and made strong, it becomes a sundial that can be easily installed outdoors in a place with different latitude and longitude. Also, the sundial part, the support member,
All members such as a base member with a universal joint may be simply reduced, the time display board scale may be roughened, or integrally molded.

[0015]

The sundial is a good science teaching material for understanding the principle of the top type sundial, and is also an inexpensive and romantic accessory for the window.

[Brief description of drawings]

FIG. 1 is a perspective view of a sundial 10 according to the present invention.

FIG. 2 is an exploded perspective view of the sundial 10 according to the present invention.

FIG. 3 is a front view of the time display board 11 according to the above embodiment,
It is a rear view and a side view.

FIG. 4 is a plan view and a side view of a central axis 40 of the time display board according to the above embodiment.

FIG. 5 is a plan view, a side view, and a bottom view of a support member 50 according to the above embodiment.

FIG. 6 is a front view, a side view, and a plan view of a base member 60 according to the above embodiment.

[Explanation of symbols]

 10 sundial 11 time display panel 12 1-hour scale 13 time display scale 14 1-degree scale 15 time display number 16 day shadow 19 side surface of time display panel 20 center hole 40 center axis 50 support member 51 time display panel insertion notch 60 free Base member with joint 61 Universal joint 62 Paper scissors type clip 63 units 70 Window glass

Claims (1)

[Claims] 1. A top-type sundial member formed of a semi-transparent time display panel, a support member on which a central shaft of the top-mounted sundial is placed, and a stand with a universal joint for mounting the support member on a window glass. A sundial composed of parts and components.