JPS6243574Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a line drawing ruler that can efficiently form a butterfly box line in baseball games, softball, etc.

BACKGROUND OF THE INVENTION The position, size, and shape of a batter box in baseball or the like relative to home plate are strictly regulated by regulations. Conventionally, this was drawn using a ruler or the like and then the lines were drawn, but this was a time-consuming process.

The present invention provides a ruler that can easily draw butterfly box lines as prescribed.

That is, the present invention is suitable for a rectangular frame provided with a line drawing slot formed between an outer frame and an inner frame, and a rear corner edge of a home plate protruding from one side of the outer frame of the rectangular frame. The gist of this invention is a butterfly box line quotation ruler, which is characterized by comprising a right-angled reference piece and a right-angled reference piece.

The ruler of the present invention is manufactured from a lightweight and undeformable plate material such as an aluminum plate or a plywood plate, and the line drawing slot has an opening width that is compatible with a predetermined line width.

Then, by aligning the standard right-angled piece of this ruler with the rear edge of the home plate and placing it on the ground, and scattering powder such as slaked lime into the line drawing slot, a butterfly turbo of a predetermined size and width will be placed in a predetermined position. Tux lines can be easily formed.

The embodiments shown in the drawings will be explained below.

FIG. 1 shows a first embodiment of the present invention, in which a right-angled reference piece 3 is brought into contact with the rear edge of the home plate P.
is provided protruding from the side edge of a rectangular frame 5, which will be described later, together with an auxiliary reference piece 3a parallel to this.

In the rectangular frame 5, the outer frame 1 and the inner frame 2 are connected at a proper position so that a line guide slot 4 corresponding to a predetermined line width is formed, and reinforcing bars 6, 6a are added as necessary.
is fixed. The reinforcing beam 6a extends in the direction of the first (third) base line from between the right-angled reference piece 3 and the auxiliary reference piece 3a, thereby facilitating the prescribed positioning of the batter box.

The rectangular frame 5 made up of the outer frame 1, inner frame 2, and reinforcing crosspiece 6 is formed by riveting or welding thin long plates, but it can also be made by cutting or punching from a flat plate. It is desirable that both sides be flat.

By scattering white pigment powder such as slaked lime into the line drawing elongated hole 4, the line of the butterfly box can be drawn, and by turning the frame over, the line of the butterfly box on the other side of the home plate P can be drawn. Although the connecting portion between the outer frame 1 and the inner frame 2 is not delineated, since this portion is extremely small, it has no substantial effect, and if necessary, it can be corrected with a small amount of powder.

In addition, two of the rectangular frames 5 described above are provided side by side, both frames are connected symmetrically by extending the right angle reference piece 3, and the necessary reinforcing connecting piece 7 is provided to form a double butter box line drawing ruler. However, this would make it large and difficult to handle, so as in the embodiment shown in Figs. 2 and 3, the left and right rectangular frames 5, 5 should be overlapped by bending at the center line of the connecting part. A hinge 10 is provided so that the rectangular frame 5 can be folded vertically or horizontally, and the rectangular frame 5 itself is divided horizontally or vertically into two frames 5' and 5'' which are connected by the hinge 10, for example. The product shown in Figure 3 can also be folded as shown in Figure 4 for easy storage and transportation.

Note that the display 11 on the outer frame 1 in FIG. 2 indicates the direction of the first (third) base line, and is provided as necessary.

Since the present invention is constructed and used as described above, it eliminates the trouble of conventional measuring, drawing, and line drawing operations, and is a practical method that allows accurate butterfly box line drawing to be easily and easily achieved. It has the following effects.

[Brief explanation of the drawing]

The drawings show an example of the present invention, and Figure 1 shows the following:
A plan view when one rectangular frame is used, FIGS. 2 and 3 are plan views of different embodiments in which two rectangular frames can be connected and folded, and FIG. 4 is a plan view of FIG. 3. FIG. 3 is a front view of the embodiment in a folded state. 1...Outer frame, 2...Inner frame, 3...Right angle reference piece,
4... Line drawing slot, 5... Rectangular frame, 10... Hinge.

Claims (1)

[Scope of utility model registration request] A rectangular frame 5 with a line drawing slot 4 formed between the outer frame 1 and the inner frame 2, and a rear corner edge of the home plate protruding from one side of the outer frame 1 of the rectangular frame 5. A butterfly box line quotation ruler characterized by comprising a right-angled reference piece 3.