JPH0248921Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] This invention relates to a slide rule for adding and subtracting three numbers. Subtraction of three numbers like ``5-2'' or ``4+5-3''
Calculations that involve addition and subtraction, such as , can be easily performed, and when calculating addition and subtraction problems such as those mentioned above, the user is asked to think about the answer, and after answering, the user is given a folded belt to confirm the answer. You can fold it up and check whether your answer is correct or not.
It is an object of the present invention to provide a slide rule for addition and subtraction that has a novel configuration that does not exist in the past and has a high learning effect.

[Structure of the idea]

In order to achieve the above object, the slide rule for addition and subtraction of this invention has three slit-shaped horizontal holes extending in the length direction of a wide and slender base board, which are parallel to each other at a constant interval in the width direction. Drill 2 holes between each horizontal hole.
Continuous numbers for setting the first number of the calculation formula are placed at regular intervals in the length direction of the upper horizontal hole to form the cursor guide band of the book and on the upper side along the upper horizontal hole of the board. The displayed fixed length is connected to the lower side of the fixed length board along the lower side elongated hole via a fold line so that it can be folded and overlapped, and the back side has the same number string as the continuous numbers. A folding band for answer confirmation displaying a string of answer numbers, and a first and second cursor guide band having sliding scale number display windows and fitted into the two cursor guide bands of the fixed length so as to be movable along the horizontally elongated hole. cursor, and continuous numbers for addition that increase sequentially to the right with the position of the plus sign on the left side as a reference on both the front and back sides of the strip that can be inserted into this cursor, and the left direction with the position of the minus sign on the right side as a reference. It is characterized by comprising first and second sliding scales that are movable along the cursor guide band in which consecutive digits for subtraction that increase sequentially are displayed at the same intervals as consecutive digits of a fixed scale. It is something to do.

〔Example〕

Below, the embodiments of this invention will be explained according to the drawings.This slide rule is "3+2+4", "9-5-2",
It is for addition and subtraction to calculate three numbers such as "4+5-3", and includes a fixed scale A with a folding band B for checking answers, two cursors c1 and c2, and two sliding scales D. ,E.

The fixed length A is a wide and slender cardboard board P of about 24 cm x 10 cm, with three slit-shaped horizontally elongated holes s1, s2, and s3 in the upper, middle, and lower part extending in the length direction parallel to each other at a constant interval in the width direction. with a width of 17 mm between each oblong hole.
Two elongated cursor guide bands p1 and p2 of about mm size
, and the consecutive numbers m from "1 to 20" for setting the first number of the calculation formula to the upper side p3 along the upper horizontally elongated hole s1 of the substrate P.
1 at regular intervals along the length of 1 (1 separated by dotted lines)
The composition is such that the images are displayed at intervals of about cm. Further, the folding band B is continuously provided on the lower side of the fixed length substrate P via a fold line n as shown in FIG. 2a,
As shown in FIG. 1, it is bent and superimposed on the surface side of the lower side p4 along the lower horizontally elongated hole s3 of the substrate P.
An answer number string f of "1 to 20" consisting of the same number string as the consecutive numbers m is displayed as shown in FIG.

The first cursor c1 and the second cursor c2 are
The two cursor guide bands P of the fixed length A are formed of a cardboard frame having sliding scale number display windows A and B.
1 and p2 so that it can be moved by hand along horizontally elongated holes s1, s2, and s3. The first sliding scale D and the second sliding scale E are attached to the left side on the surface of the narrow strips d and e (made of cardboard with a length of 19 cm and a width of 15 mm) that can be inserted into the cursors c1 and c2. Continuous digits h for addition from "1 to 10" that increase sequentially to the right from the position of the plus sign g are printed at the same intervals as the continuous digits m of the fixed length A, and On the back of d and e, the numbers increase sequentially from 1 to
It has the same structure, with consecutive numbers j for subtraction up to 10" displayed at the same intervals as consecutive numbers m of fixed length A,
The cursors are inserted into the cursors c1 and c2 as shown in FIGS. 2 and 3 so as to be able to move along the cursor guide bands p1 and p2 of the fixed length A.

Figure 2 is an explanatory diagram showing how to use it when calculating "3+2+4", and is a fixed length continuous number m
Align the left side plus sign g of the first slide measure D below the ``3'' digit, and align the window I of the first cursor c1 with the ``2'' digit of the first slide measure numeral h, as shown in Figure 2a.
Next, move the second sliding scale E inserted through the second cursor c2, and move the plus sign g' on the left side to the first
Align the window of the second cursor c2 with the number "4" of the second slide scale numeral h' as shown in FIG. 2b. This cursor c1,c
2 and the alignment of slide scales D and E, the answer can be found immediately using a normal slide rule, but
In this design, in order to increase the learning effect,
In this state, the folding band B for checking the answer is unfolded on the same plane as the fixed length board P, and the answer number string f on the back side is not visible.

Therefore, the user considers the answer to the calculation formula "3+2+4" and after giving the answer, folds the folding band B for checking the answer as shown in FIG. 2c. Then, the answer number string f on the back of the folding band will be exposed as shown in Figures 1 and 2 c, and the number "9" of the answer number string f will be placed below the number "4" of the second sliding scale numeral h'. Second
Since the answer is given as shown in Figure c, students can learn to look at the answer numbers and check whether their answer is correct or not.

Figure 3 shows "4+5-" which is a combination of addition and subtraction.
This is an explanatory diagram showing how to use it when calculating "3". In this case, insert the first slide measure D for addition, and hold the second slide measure E by hand as in Fig. Pull it out to the right and insert it upside down for subtraction as shown in Figure 3b. In this state, first align the left plus sign g of the first sliding scale D under the number "4" of the fixed length continuous number m, and move the first cursor c
Align the window A of 1 with the number "5" of the first scale number h as shown in Figure 3a. Next, move the second slide measure E inserted through the second cursor c2, align the right side mass numeric display i under the "5" number of the first slide measure number h, and Match the number "3" of the second slide scale number j as shown in Figure 3b.
In this state, the user considers the answer to the calculation formula "4+5-3" in the same way as before, and after giving the answer, folds the folding band B for checking the answer as shown in FIG. 3c. Then, the answer number string f on the back of the folding belt will be exposed as shown in Figures 1 and 3 c, and the number "6" of the answer number string f will appear below the number "3" of the second sliding scale number j. 3
The answer will appear as shown in Figure c, so you can check whether your answer is correct by looking at the answer number. Although not shown in the drawing, if both the first slide measure D and the second slide measure E are inserted upside down for subtraction, "9-5-2" can be obtained in the same manner as above. You can also perform subtraction calculations on three numbers, such as:

[Effect of idea]

Since the slide rule for addition and subtraction of this invention is as described above, it can also be used to add three numbers such as "3+2+4", or to subtract three numbers such as "9-5-2". Calculations that involve addition and subtraction such as ``4 + 5 - 3'' can be easily performed, and when calculating addition and subtraction problems such as those mentioned above, the user can think about the answer and check the answer after answering. To provide a slide rule for addition and subtraction, which has the effect of allowing the user to check whether the answer he or she has given is correct by folding the folding strip upward, and has a novel configuration that does not exist in the past and is highly effective for learning. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the slide rule for addition and subtraction of the present invention in an exploded state, Fig. 2 is an explanatory diagram showing how to use it when calculating "3 + 3 + 4", and Fig. 3 is a calculation of "4 + 5 - 3" FIG. A...Fixed length, P...Fixed length board, p1, p2
...Cursor guide band, p3...Top side of board, p
4...Bottom side of the board, s1, s2, s3...Three oblong holes at the top, middle, and bottom, m...Continuous numbers for setting the first number in the calculation formula, B...For answer confirmation folded obi,
n...Fold line, f...Answer number string, c1...1st
Cursor, c2...Second cursor, A, B...Cursor window, D...First slide measure, E...Second slide measure,
d, e... Thin strip, g, g'... Left side plus sign, i
...Minus display on the right side, h, h'...Continuous numbers for addition displayed on the front side of the strip, j...Continuous numbers for subtraction displayed on the back side of the strip.

Claims (1)

[Scope of utility model registration request] It is a slide rule for addition and subtraction that calculates three numbers, and has three slit-like horizontal holes in the top, middle, and bottom extending in the length direction of a wide and slender board that are bored in parallel at regular intervals in the width direction. two cursor guide bands are formed between each horizontally elongated hole, and consecutive numbers for setting the first number of the calculation formula are placed on the upper side along the upper horizontally long hole in the length direction of the upper horizontally long hole. A fixed length is displayed at regular intervals on the lower side of the fixed length board, and the continuous length is connected to the lower side of the board along the lower horizontal elongated hole through a crease line so that the fixed length can be folded and overlapped. It has a folding band for answer confirmation that displays an answer number string consisting of the same number string as the numbers, and a sliding scale number display window, and is inserted into the two cursor guide bands of the fixed length so as to be movable along the horizontally elongated hole. The first and second cursors that can be inserted into the cursor, and continuous numbers for addition that increase sequentially to the right from the position of the plus display on the left side, and the minus display on the right side, on both the front and back sides of the strip that can be inserted into the cursor. first and second sliding scales that are movable along the cursor guide band that display continuous numbers for subtraction that increase in order to the left with the position of , at the same intervals as the continuous numbers of the fixed scale; A slide rule for addition and subtraction.