JP3196124U - Straight line ruler for blackboard - Google Patents

Abstract

A straight line ruler for a blackboard that is easy to draw on a blackboard and easy to carry. SOLUTION: A board A that is fixed to the blackboard on the back side is provided with a board A that is long on the left and right sides, a ruler edge 10 that is the same length as the board and has a dimensional scale on the front side, and a handle 14 is provided in the center. A ruler plate slide surface is formed on the front part of the board over the entire length on the left and right sides, and a guide part of the ruler plate is provided on the rear part over the entire length on the left and right sides. The rear end of the guide plate is slidably inserted into a lateral groove provided at the front end of the guide portion, and a holding portion is provided at the rear end of the connecting plate that protrudes rearward from the center portion of the ruler plate. A magnet 16 that prevents sliding of the ruler plate is provided at the center of the guide portion and the center of the connecting plate, and the left and right sides of the connecting plate protrude from the left and right ends of the guide portion. The locking edge 18 that contacts the stop pin 17 is formed. [Selection] Figure 1

Description

  The present invention relates to a straight line ruler for a blackboard used in a school classroom or the like.

  Japanese Utility Model Publication No. 3-66791 discloses a slide ruler for measurement and drawing in which an auxiliary ruler is slidably inserted into a ruler body.

  The above slide ruler is formed so that the auxiliary ruler can be slid only on one side of the ruler body, so after drawing the auxiliary ruler from one side of the ruler body attached to the blackboard and drawing it on the other side of the ruler body However, when trying to draw a series of lines, there is a problem that the ruler body must be accurately moved to the other side.

Japanese Utility Model Publication No. 3-66791

  An object of the present invention is to provide a straight line ruler for a blackboard that can be easily carried and can be drawn on a blackboard.

  The straight-line ruler for a blackboard according to claim 1 of the present invention has a long board on the right and left with magnets for fixing to the blackboard on the back side, and a ruler edge having the same length as the board, with a dimensional scale on the front side. The ruler plate is formed with a handle at the center, and a slide surface of the ruler plate is formed on the front portion of the substrate over the entire length of the left and right sides, and the guide portion is projected over the entire length of the left and right sides. And the rear end of the ruler plate is slidably fitted into a lateral groove provided at the front end of the guide portion, and an engagement portion is provided at the rear end of the connecting plate protruding rearward from the center portion of the ruler plate, The engaging portion is slidably engaged with the rear end of the guide portion, and a magnet for preventing the ruler plate from sliding is provided at the center of the guide portion and the center of the connecting plate. , Characterized in that a locking edge is formed to contact the stop pins protruding from the left and right ends of the guide portion. To have.

  The straight ruler for blackboard according to the invention of claim 1 is attached to a steel blackboard using a magnet provided on the back side of the board, and then a straight line is drawn on the blackboard using the ruler edge of the ruler plate. To draw a longer straight line, slide the ruler plate to the left or right side of the board and draw a straight line. In addition, when drawing a straight line of a predetermined length, a dimension scale provided on a ruler plate is used.

  The ruler plate has a rear end held in a lateral groove formed over the entire length on the substrate, an engagement portion provided at the rear end of the connecting plate is held by a guide portion provided on the rear side of the substrate, and Slide smoothly.

  The magnets provided on the guide part of the substrate and the guide part of the ruler plate prevent the ruler plate from sliding. When the ruler plate is slid largely to the left or right from the substrate, the left or right engaging edge of the connecting plate abuts against the stop pin of the guide portion, thereby preventing the ruler plate from being detached from the substrate.

  The straight-line ruler for blackboard according to claim 1 of the present invention is provided with the engaging portion of the connecting plate fixed to the lateral groove of the substrate and the central portion of the ruler plate on the rear side of the substrate as described above. Since the ruler plates can be smoothly slid to the left and right because they are fitted to the guide edges, there is no step on both ruler edges by sliding the ruler plate. Can be drawn.

  When aligning the ruler plate with the substrate, they are integrated by magnets provided in the center and the ruler plate is prevented from sliding, so it can be carried with peace of mind and convenient for storage.

It is a top view which shows embodiment of the linear ruler for blackboards which concerns on this invention. It is a front view same as the above. It is a bottom view same as the above. It is an expanded sectional view of the XX line in a front view same as the above. In embodiment same as the above, it is a partially notched top view which shows the state which slid the ruler plate. It is a front view same as the above.

  Hereinafter, an embodiment of a straight ruler for blackboard according to the present invention will be described in detail with reference to FIGS.

  Reference numeral A is a substrate made of plywood having a length of 100 cm, and B is a ruler plate made of plywood that has a length of 100 cm and slides left and right on the substrate A.

  In the substrate A, a slide surface 3 of a ruler plate B is formed over the front half of the lower plate 2 having a plurality of plate-like magnets 1 and 1 fixed on the bottom surface, and the thin plate is formed on the rear half. By laminating the upper plate 5 across the middle plate 4 of the width, a guide portion 7 having a lateral groove 6 formed at the front end is formed over the entire length of the left and right. At the rear end of the upper plate 5 of the guide portion 7, a guide edge 8 of an engaging portion in a connecting plate described later is formed.

  On the front side of the ruler plate B, a ruler edge 10 slightly protruding from the front edge 9 of the substrate A is formed over the entire length of the left and right sides, a scale 11 is displayed along the ruler edge 10, and the rear edge 12 is The board A is slidably fitted in the lateral groove 6 of the guide portion 7 in the left-right direction. A connecting plate 13 that slides on the guide portion 7 is provided at the center of the ruler plate B. A handle 14 is fixed to the front end position of the connecting plate 13, and a rear end of the guide portion 7 is provided at the rear end of the connecting plate 13. An engaging portion 15 that slides along the guide edge 8 at the end is formed.

  Magnets 16 and 16 are provided at the center of the guide portion 6 in the substrate A and the center of the connecting plate 12 in the ruler plate B, respectively, to prevent the ruler plate B from sliding when the ruler plate B is superimposed on the substrate A. doing. Further, on the left and right sides of the connecting plate 13, locking edges 18, 18 are formed to abut against stop pins 17, 17 protruding from the left and right ends of the guide portion 6 in the substrate A when the ruler plate B is slid. Yes. Reference numeral 19 denotes a steel blackboard.

  The straight line ruler for blackboard in the above embodiment draws a straight line of a predetermined length with the ruler edge 10 of the ruler plate B after the substrate A is fixed to the blackboard 19 using the magnets 1 and 1, and draws a straight line to 1 m or more. In this case, the ruler plate B can be slid to the left or right while the substrate A is fixed, and a straight line having a maximum height of 180 cm can be drawn.

  The ruler plate B is supported by the lateral groove 6 and the guide portion 7 of the substrate A, and slides smoothly to the left and right, and from the substrate A of the ruler plate B by the collision of the locking edges 18 and 18 with the stop pins 17 and 17. Since the drop-out of the is prevented, the line can be drawn with confidence. Moreover, when the ruler plate B is stacked on the substrate A after use, the magnet 16 of the ruler plate B is attracted to the magnet 16 of the substrate A, and the slide of the ruler plate B is prevented, which is convenient for carrying. .

  In the above embodiment, both the substrate A and the ruler plate B are formed of a plywood plate, but may be formed of a gutter plate, a light plastic, or a light metal. Moreover, although the length of the board | substrate A and the ruler board B was 100 cm, it is not limited to this. In addition, although the said embodiment is a case where a blackboard is used, it is the same also in the case of a white board made of steel.

A substrate B ruler plate 1 magnetite 2 lower plate 3 slide surface 4 middle plate 5 upper plate 6 lateral groove 7 guide portion 8 guide edge 9 front edge of substrate 10 ruler edge 11 dimension scale magnet 12 rear edge of ruler plate 13 connection Plate 14 Handle 15 Engagement portion 16 Magnet stone 17 Stop pin 18 Locking edge 19 Black plate

Claims (1)

  It consists of a long board on the left and right with a magnet for fixing to the blackboard on the back, a ruler plate that is the same length as the board, has a ruler edge with a dimensional scale on the front side, and has a handle in the center The ruler plate slide surface is formed on the front portion of the substrate over the entire length of the left and right sides, and the guide portion of the ruler plate is projected over the entire length of the left and right sides to guide the rear end of the ruler plate. It is slidably inserted into a horizontal groove provided at the front end of the guide part, and a clamping part is provided at the rear end of the connecting plate protruding rearward from the center part of the ruler plate, and the clamping part is slidable at the rear end of the guide part. Magnets that prevent the ruler plate from sliding are provided at the center of the guide portion and the center of the connecting plate, and stop pins projecting from the left and right ends of the guide portion are provided on the left and right sides of the connecting plate. A straight ruler for a blackboard, characterized in that an abutting locking edge is formed.

Images