JPS6121044Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a chart holder for visual acuity testing.
In particular, the present invention relates to a chart holder in which a protrusion for fitting the chart is provided on the outer edge of a window frame for light transmission of the holder.

The chart holder for visual acuity test was made in 1972.
-105897 (Utility Application No. 51-11220) exists, but this consists of a glass chart (inspection chart) bonded to a holder with adhesive. There was an inconvenience that the adhesive would stick to the chart or the adhesive would be pushed out onto the chart. Furthermore, when replacing the chart, the outer edge of the chart holder must be pulled up with great care; even the slightest bit of carelessness can easily result in finger squeezing or hand oil, and it is also difficult to set or remove the chart. If the holder was even slightly twisted during the process, it would easily bend and the glass would fly off, resulting in many accidents where it became unusable. Furthermore, since the chart was fixed using adhesive, it was impossible to remove the chart itself from the holder and replace it. Furthermore, when storing charts, since the chart holders are stacked one on top of the other, there is a risk of damage to the charts themselves, and great care must be taken when handling, storing, and taking out the charts.

The purpose of the present invention is to provide a new chart holder that eliminates the drawbacks of the prior art.According to the present invention, no adhesive is required, there is no staining caused by the adhesive, and the chart holder is easy to handle. can also be easily replaced.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing a chart holder according to the present invention. The chart holder 10 is made of an elastic material such as plastic, and is a rectangular parallelepiped with a small depth, and has a rectangular light-transmitting window 1 opened in the center. Except for the thickness of the window frame, the inside of the rectangular parallelepiped box has a concave cutout on the entire back surface facing the front of the window. Further, the upper part of the window 1 is provided with a recessed portion from the front side of the window, and conversely, the back surface is shaped to protrude.

The front outer edge of the window 1 is provided with projections for locking the chart, and the upper and lower parts of the outer edge are integrally provided with a base part 3 and an upper base part 4 for supporting the chart, and the tips of the base parts are provided with stopper edges 5 and 6 to prevent the chart from coming off forward at the front. Also, on both the left and right sides of the outer edge of the window frame, dam parts 7 and 8 are provided along the edge of the window to abut and lock the chart so that it does not shift left and right.

The width of the chaat used in this application is approximately the same as the width between the inner walls 7a and 8a of the left and right weirs 7 and 8, and the chaat is secured by riding on the left and right outer edges 9a and 9c of the window frame. Ru. Further, the length approximately corresponds to the distance between the lower base part 3 and the upper base part 4, and is held between the base parts 3 and 4. Furthermore, the thickness of the chart is approximately the same as the width of the grooves in the base parts 3 and 4, and when the chart is installed, it is pressed toward the back surface of the window by the restraining edges 5 and 6, and at the same time the outer edge of the window is pressed. Since it also comes into contact with the chart rests 9a to 9d, it is also held by the restraining edge and the outer edge of the window frame (chart rest).

When actually installing the chart, as shown in Fig. 2, a thin rectangular glass chart 30 is attached.
Holding the left and right or top and bottom side walls of the window, first extend one end of the chart to the inside of the window B at an angle of inclination from the front A of the window.
The side walls of the chart are fitted into the grooves of the upper and lower base parts 3 and 4. After that, the left and right ends are attached to the outer edges 5 and 6.
against the restraint of the window 8 and lift it up to the outer edge 9 of the
Move it while lifting the left and right sides so that it stops when it comes into contact with 7. Thereby, the chart can be accurately attached to the outer edge of the window frame (chart rest) between the dams 7, 8 and the outer edges 5, 6 of the bases 3, 4.

Furthermore, when removing the chart from the chart holder, by twisting the rectangular parallelepiped itself while firmly grasping the upper and lower parts of the rectangular parallelepiped 10, the chart can be easily released from the connection with the outer edge 9 of the window frame, without having to manipulate the chart itself. can also be removed.

Next, the side wall 11 of the rectangular parallelepiped 10 is provided with a cylindrical notch or a protruding end so as to receive and receive one side of a circular support 20 that is rectangularly screwed onto a disc for supporting a chart holder. A recess 13 is formed.

Furthermore, since the pillar 20 is a circular pillar made of metal, there is a possibility that the chart itself may be rattled when moved up and down while it is attached, so a recess 21 is provided around the cylinder at the middle of the pillar. On the other hand, a protrusion 14 is also provided on the side wall of the rectangular parallelepiped for engagement therewith, and the chart is fixed where the concave and protrusion engage.

Since the chart holder according to the present invention has the structure detailed above, it has the advantage that it is extremely easy to attach and remove the chart, and there is no possibility of soiling the chart itself. Even when stacked, the charts themselves do not come into direct contact with each other, so there is no risk of damage, which has many practical values.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a chart holder according to the present invention. FIG. 2 is a sectional view showing the procedure for mounting the holder. 1: Light transmission window, 2: Outer edge, 3, 4: Base part,
5, 6: Suppression edge, 7, 8: Weir, 9a-d: Chart rest, 10: Chart holder, 11,
12: Side wall, 13: Concave portion, 14: Convex portion, 20: Chart holder support cylinder, 21: Concave portion, 30: Chart for visual acuity test.

Claims (1)

[Scope of utility model registration request] A window 1 for transmitting light is provided in a shallow plastic rectangular parallelepiped 10, and base parts 3 and 4 for supporting charts are extended from the upper and lower parts of the outer edge 2 of the window, and a chart restraining edge 5 is provided at the tip of the base part. , 6 are installed protrudingly, and
Weir parts 7 and 8 for abutting and locking the charts on the left and right walls of the outer edge are extended along the left and right ends of the window, and support columns 20 are installed on the side walls 11 and 12 of the rectangular parallelepiped 10.
a semicircular recess 13 for receiving the locking protrusion 1;
A chart holder for visual acuity testing characterized by having a number 4.