JPS6228387Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mortise ruler that can easily mark a mortise in the center of a desired square timber. That's right.

The bottom side 1a and the top side 1 are placed at the center of the top surface of the elongated base plate 1.
A trapezoidal ruler plate 2 having a bottom side 1a longer than an upper side 1b consisting of a vertical side 1c and a 45° oblique side 3 is set upright.

It is easier to use the elongated base plate 1 if the width thereof is wide.

A center scale line 4 is displayed at the center of the 45° oblique side 3 of the ruler plate 2 on the ruler plate surface 5 in a direction perpendicular to the 45° oblique side 3. The drawing shows a top reference line 6 at the upper end of the 45° hypotenuse 3 and perpendicular to the 45° hypotenuse 3.

A mortise center line 7 parallel to the base plate 1 is carved on the ruler plate surface 5.

Mortise scale lines 8 are carved above and below this mortise center line 7 in parallel to this mortise center line 7 at intervals of half the width of the mortise.

The drawing shows a case where four mortise scale lines 8 are carved above and below the mortise center line 7 so that four different widths of mortise marks can be made.

9 in the figure is a punched hole having a surface perpendicular to the hypotenuse 3 at 45 degrees.

Traditionally, mortises were marked with an ink hole ruler, but it was only possible to mark mortises of a certain width, and it was also possible to mark pillars with a width other than the specified width. In this case, there were drawbacks such as extremely poor dimensional accuracy.

The present invention solves this drawback, and since it is configured as described above, the 45 mm of the ruler plate 2 is placed on the prism surface 11 between the left and right sides of the prism 10 on which the mortise is to be marked, as shown in FIG.゜Align the hypotenuse 3 and align the upper end reference line 6 with one end of the prism 10, bring the inside of the base plate 1 into contact with the other end, and place a mark on the prism surface 11 corresponding to the center scale line 4. , and in this state, move the ruler plate 2 in parallel, make a similar mark in a distant place, and draw a line connecting these two marks, this line will become the exact center line of the prism 10.

In this case, the inside of the base plate 1 is brought into contact with the other end of the prism 10, and the upper end reference line 6 of the 45° hypotenuse 3 is aligned with the prism 10.
Since it is aligned with one side edge of 0, make it accurate and make it square prism 1.
The center line of 0 can be found.

Next, the center line drawn on this prismatic surface 11 is overlapped with the mortise center line 7 of the ruler plate 2, and marks corresponding to the mortise scale line 8 corresponding to the desired mortise width are placed on the top and bottom of the prismatic surface 11. By carving four points on the left and right sides and drawing a line connecting these left and right marks, you can mark the mortise with the center of the mortise accurately aligned with the center of the square post 10.

In this way, the center scale line 4 carved on the 45° hypotenuse 3
Take two points corresponding to the prism surface 11 and make the prism 10
Since the center line of the prism 10 can be drawn accurately, it is possible to accurately draw the center line of the prism 10 of any width. It is convenient because it is possible to easily draw a line the width of the mortise in the center of the square post 10 using the hole scale line 7, and it is possible to mark the mortise in an extremely efficient manner, and its structure is also extremely simple. Because of this, it can be manufactured easily and the proposed product can be provided at low cost, and has many excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of the product, FIG. 2 is a side view thereof, and FIG. 3 is a plan view showing the product in use. 1... Base plate, 1a... Bottom side, 1b... Top side, 1
c... Vertical side, 2... Ruler plate, 3... 45° hypotenuse, 4
... Center scale line, 5 ... Ruler plate surface, 6 ... Top reference line, 7 ... Mortise center line, 8 ... Mortisfaction scale line.

Claims (1)

[Scope of utility model registration request] The bottom side 1a and the top side 1 are placed at the center of the top surface of the elongated base plate 1.
A trapezoidal ruler plate 2 is erected, and the bottom side 1a is several times longer than the upper side 1b, and the center scale line 4 is placed at the center of the 45° oblique side 3 of the ruler plate 2. The mortise center line 7 is marked on the ruler plate surface 5 between the bottom side 1a and the top side 1b parallel to the base plate 1, and this tenon On the ruler plate surface 5 above and below the hole center line 7, mortise scale lines 8 are carved parallel to the mortise center line 7 at half the intervals of the intervals between mortises of various sizes, and at a 45° angle on the hypotenuse 3. A mortise ruler characterized by displaying an upper reference line 6 at the upper end.