JPH0952494A - Horizontal scale supporting device in parallel ruler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retract a horizontal scale from a top of a drawing board when the horizontal scale is not in use even when the drawing board has a protector. SOLUTION: At both side parts of a drawing board 11, a longitudinal rail 12 having a guide section 12a is provided. A slide section 18 is movably provided at the guide section 12a and the guide section 12a is covered with a protector 17. A scale operation arm 17 is attached to the slide section 18 in a rocking manner and a horizontal scale 15 is connected to the rocking end of the scale operation arm 17. 1 Near the end part of the drawing board 11 of the longitudinal rail 12, a slit 41 in which the scale operation arm 17 is to be inserted is formed. Thus, the horizontal scale 15 can be housed in the rear face of the drawing board 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel ruler having a horizontal scale movably supported along vertical rails provided on both sides of a drawing board.

[0002]

2. Description of the Related Art Conventionally, there is known a parallel ruler constructed by connecting a horizontal scale provided on the upper surface of a drawing board to a slide portion movably supported by vertical rails on both sides of the drawing board. . In this parallel ruler, both ends of the horizontal scale are connected to the slide part via the scale operating arm, and the horizontal scale is connected to the scale operating arm, for example, when the drafting paper is replaced or thick drafting paper is used. The scale actuating arm is rotatable with respect to the slide portion.

Further, conventionally, a parallel ruler is known in which a vertical rail is covered with a protector to protect a slide portion.

[0004]

However, in the conventional parallel ruler, since the horizontal scale is always located on the drawing board, the horizontal scale may be an obstacle when something is placed on the drawing board, for example. there were. Therefore, there has been a demand for a configuration in which the horizontal scale can be retracted to a position where it does not interfere with work or the like when not in use.

It is an object of the present invention to provide a horizontal scale supporting device of a parallel ruler which has a protector and can retract the horizontal scale from the drawing board when the horizontal scale is not used.

[0006]

A horizontal scale support device for a parallel ruler according to the present invention is provided with a vertical rail having guide portions extending along both sides of a drawing board, a protector covering the guide portions, and moving to the guide portions. A freely supported slide part, a scale operating arm that is attached to this slide part and that swings in a plane perpendicular to the surface of the drawing board, and a slide part that is connected to the swing end of this scale operating arm and that slides vertically. A horizontal scale that moves along the surface of the drawing board by moving along the rail is provided, and between the upper surface of the vertical rail and the protector, there is a scale actuating arm for the horizontal scale to move on the drawing board. An opening for insertion is formed, and a slit through which the scale actuating arm can be inserted is formed in a portion on the lower surface of the vertical rail which is close to one end of the drawing board.

The opening may be formed over the entire range in which the horizontal scale moves on the drawing board. The length of the slit is preferably longer than the scale actuating arm. A cap connecting the end of the vertical rail and the end of the protector may be provided at the end of the slit, and in this case, the cap may be rotatably attached to the vertical rail.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view of a parallel ruler, which is the first embodiment of the present invention, seen from above, and FIG. 2 is II-II of FIG.
3 is a sectional view taken along the line III-III in FIG.

Vertical rails 1 are provided on both left and right sides of the drawing board 11.
2 and 13 are attached respectively. A horizontal rail 14 is provided on the upper surface of the drawing board 11, and a transparent acrylic elongated horizontal scale 15 is integrally fixed to the lower surface of the horizontal rail 14, that is, the lower surface facing the upper surface of the drawing board 11. ing. Both ends of the horizontal rail 14 have a connecting arm 16
And the scale operating arm 17 are connected to the slide portion 18, and the slide portion 18 is movably supported by the guide portions 12a of the vertical rails 12 and 13. Therefore, the horizontal rail 14 and the horizontal scale 15 are movable along the surface of the drawing board 11.

A tray 19 for holding a drawing tool or the like is provided on the front side (lower side in FIG. 1) of the drawing board 11. The two slide portions 18 supported by the vertical rails 12 and 13 respectively include the vertical rails 12 and 13 and the tray 19.
Are connected to each other by wires 21 (see FIG. 5) passing through the inside of the tray, and the tray 19 is provided with an operation lever 22 for holding the wires 21 and fixing the slide portion 18 at a desired position. .

A connecting plate 24 is fixed to the horizontal rail 14 via a screw 23, and a connecting arm 16 is provided on the upper surface of the protruding portion of the connecting plate 24 from the horizontal rail 14. A knob 25 is provided on the upper surface of the connecting arm 16,
The knob 25, the connecting arm 16, and the connecting plate 24 are provided with screws 26.
Are fixed to each other by. The tip of the screw 26 is screwed into a female screw 25a formed at the axial center of the knob 25, and the other part of the screw 26 is fixed to the connecting arm 16 so as not to rotate. Therefore, when the knob 25 is rotated, the screw 26 moves up and down, whereby the connecting plate 24, that is, the horizontal rail 14 and the horizontal scale 15 can be fixed or loosened with respect to the connecting arm 16.

Below the guide portion 12a of the vertical rail 12, a projecting portion 12b is formed which projects in the direction opposite to the drawing board 11. The protector 27 is provided at the tip 12c of the projecting portion 12b.
Is attached. The protector 27 is provided over the entire length of both sides of the drawing board 11 and covers the guide portion 12a. The upper edge of the protector 27 is separated from the vertical rail 12, that is, an opening 28 is formed over the entire range in which the horizontal scale 15 moves on the drawing board 11.

2 to 5, the structure of the mechanism for movably supporting the horizontal rail 14 with respect to the drawing board 11 will be described. 4 shows a case where the drawing board 11 is used in an upright state, and the drawing board 11 is inclined, for example, by about 75 degrees with respect to the horizontal plane.

The slide portion 18 has a mountain-shaped bracket 32. A pair of guide rollers 31 are rotatably provided on the bracket 32.
It is engaged with the two guide portions 12a. A fixing plate 33 is provided on the bracket 32, and the bracket 32 and the fixing plate 33 are fixed by a bolt 34. The wire 21 is sandwiched between the bracket 32 and the fixing plate 33,
As a result, the slide portion 18 is connected to the wire 32.

The scale operating arm 17 includes the bracket 3
Pin 35 to which one of the two guide rollers 31 is attached
It is rotatably supported by. That is, the scale operating arm 17 can swing about the pin 35 in a plane perpendicular to the surface of the drawing board 11. The horizontal rail 14, that is, the horizontal scale 15 is attached to the swinging end of the scale operating arm 17 via the connecting arm 16 and the pin 37. That is, the pin 37 is inserted into the hole of the connecting arm 16, the screw 37a formed at the tip of the pin 37 projects from the hole of the scale operating arm 17, and the nut 38 is screwed to the projecting end. A roller 36 is rotatably provided on the pin 37. As clearly shown in FIG. 3, the roller 36 rolls on the upper surface of the vertical rail 12 and directly above the guide portion 12a, and the scale operating arm. 1
7 passes through the opening 28. Therefore, the horizontal scale 15 can move along the drawing board 11 and can rotate around the rotation center of the roller 36.

As shown by the solid line in FIG. 4, the horizontal scale 15 normally moves along the surface of the drawing board 11, that is, along the vertical rail 12. For example, when the drafting person exchanges drafting paper, the scale operating arm 17 is rotated around the pin 35, or the horizontal rail 14 (not shown in FIG. 4) is indicated by the chain double-dashed line. Is rotated to separate the horizontal scale 15 from the surface of the drawing board 11. Further, the roller 36 is configured to roll on the upper surface of the vertical rail 12, and the center of gravity of the horizontal rail 14, the horizontal scale 15, the connecting arm 16 and the like is set to the roller 3.
It is located closer to the drawing board 11 than the center of rotation of No. 6 is. Therefore, even when the drawing board 11 is used in the upright state (the state of FIG. 4), the horizontal rail 14 and the horizontal scale 15 are used.
Is always inclined so as to be parallel to the drawing board 11, and FIG.
It does not rotate as shown by the chain double-dashed line and does not hinder the drawing work.

On the other hand, the slit 4 into which the scale actuating arm 17 can be inserted is located in the projecting portion 12b of the vertical rail 12 in the vicinity of the tray 19 (see FIG. 1) of the drawing board 11.
1 is formed. As shown in FIGS. 6 and 7, the slit 4 is formed at the end of the vertical rail 12 and the protector 27.
A fixed cap 42 and a rotary cap 43 are provided in a region close to the end of the No. 1. The rotary cap 43 is rotatably supported by the vertical rail 12, and connects the end of the vertical rail 12 and the end of the protector 27 when engaged with the fixed cap 42. When the rotary cap 43 is rotated toward the protector 27 side and the end of the slit 41 is opened, the scale operating arm 17 can insert the slit 41, and the horizontal rail 14 and the horizontal scale 15 are attached to the rear surface of the drawing board 11. Can be accommodated on the side. The length of the slit 41 is longer than that of the scale operating arm 17, and more specifically, longer than the total length of the length of the scale operating arm 17 and the width of the horizontal rail 14. Therefore, as shown in FIG. 4, the slide portion 18 can be moved to the vicinity of the upper end portion of the slit 41, whereby the horizontal rail 14 and the horizontal scale 15 are completely accommodated on the back surface of the drawing board 11.

As described above, the vertical rail 12 is used in this embodiment.
A slit 41 into which the scale actuating arm 17 can be inserted is formed near the end of the drawing plate 11 on the overhanging portion 12b. Therefore, even when the protector 27 is provided, the horizontal rail 14 and the horizontal scale 15 can be accommodated on the back surface of the drawing board 11. Figure board 11
Horizontal rail 14 even when used in an upright position
Therefore, there is no possibility that the horizontal scale 15 inadvertently falls forward, and the drafting work is not hindered.

FIG. 8 shows a second embodiment. First
The configuration different from that of the first embodiment is such that the fixing cap 42 is provided also on the protector 27 side portion of the vertical rail 12 and the slit 4
The point is that the end of 1 is always open. Other configurations are first
Is the same as the embodiment of. According to the second embodiment, the same effect as that of the first embodiment can be obtained, but the slit 41
Regarding the strength of the vertical rails 12 in the vicinity of, the first embodiment is preferable.

[0020]

As described above, according to the present invention, even with a drawing board having a protector, the horizontal scale can be retracted from the drawing board when the horizontal scale is not used.

[Brief description of drawings]

FIG. 1 is a view of a parallel ruler, which is a first embodiment of the present invention, seen from above.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a partial cross-sectional view showing a case where the drawing board is used in an upright state.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a perspective view of the vicinity of a slit of the drawing board as seen from below the drawing board.

FIG. 7 is a front view showing the vicinity of a fixed cap and a rotary cap of the drawing board.

FIG. 8 is a perspective view showing a part of a second embodiment of the present invention.

[Explanation of symbols]

 11 Drawing Board 12 Vertical Rail 12a Guide Part 12b Overhanging Part 15 Horizontal Scale 17 Scale Operating Arm 18 Sliding Part 27 Protector 28 Opening 41 Slit

Claims (5)

[Claims] 1. A vertical rail having guide portions extending along both sides of a drawing board, a protector for covering the guide portions, a slide portion movably supported by the guide portions, and a slide portion attached to the slide portions. , A scale operating arm that swings in a plane perpendicular to the surface of the drawing plate and a swinging end of the scale operating arm, and the slide portion moves along a vertical rail, thereby A horizontal scale that moves along a surface, an opening is formed between the upper surface of the vertical rail and the protector, through which the scale operation arm is inserted for the horizontal scale to move on the drawing board, The parallel ruler is characterized in that a slit through which the scale actuating arm can be inserted is formed in the lower surface of the vertical rail in the vicinity of one end of the drawing board. Flat scale support device. 2. The horizontal scale support device in a parallel ruler according to claim 1, wherein the opening is formed over the entire range in which the horizontal scale moves on the drawing board. 3. The horizontal scale support device in a parallel ruler according to claim 1, wherein the length of the slit is longer than that of the scale operating arm. 4. The horizontal scale support device in a parallel ruler according to claim 1, wherein a cap that connects an end of the vertical rail and an end of the protector is provided at an end of the slit. . 5. The horizontal scale support device in a parallel ruler according to claim 4, wherein the cap is rotatably attached to the vertical rail.