JP3008334B2 - Horizontal scale support device for parallel ruler - Google Patents

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 has been known a parallel ruler constituted by connecting a horizontal scale provided on an upper surface of a drawing board to a slide portion movably supported by vertical rails on both sides of the drawing board. . In this device, both ends of the horizontal scale are connected to the slide section via the scale operation arm.For example, when changing the drawing paper or using thick drawing paper, the horizontal scale is moved relative to the scale operation arm. The scale operation arm is rotatable with respect to the slide portion.

[0003] The connection point between the horizontal scale and the scale operating arm is located on the side of the vertical rail, for example, approximately at the center of the height of the vertical rail. That is, the horizontal scale is swingable about a position substantially at the center of the height of the vertical rail.

[0004]

Drawing boards are sometimes used in an upright state. In such a case, the position of the center of gravity of the members such as the horizontal rail and the horizontal scale pivotally supported by the scale operating arm becomes very close to the swing center of these members, and the posture of the horizontal scale and the like tends to be unstable. The problem occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a horizontal ruler supporting device for a parallel ruler, in which the horizontal scale does not become unstable even when the drawing board is used in an upright state.

[0006]

According to the present invention, there is provided a horizontal scale supporting apparatus for a parallel ruler, comprising: a vertical rail having a guide extending along both sides of a drawing plate; and a slide unit movably supported by the guide. And a scale operating arm attached to the slide portion and swinging in a plane perpendicular to the surface of the drawing board, and connected to a swinging end of the scale operating arm,
The slide unit includes a horizontal scale that moves along the surface of the drawing plate by moving along the vertical rail, and a roller that is rotatably provided at the swinging end of the scale operating arm. The center of gravity of the member that rolls on the upper surface and is connected to the scale operating arm is positioned closer to the drawing board than the center of rotation of the roller even when the drawing board is used in an upright state. .

[0007] A protector may be provided to cover the guide, and an opening may be formed between the vertical rail and the protector over the entire range in which the horizontal scale moves on the drawing board. In this configuration, the scale operation arm passes through the opening. The roller may roll just above the guide on the upper surface of the vertical rail.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view of a drawing plate provided with a horizontal scale support device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along line III-III of FIG.

On the left and right sides of the drawing plate 11, a vertical rail 1 is provided.
2 and 13 are respectively attached. A horizontal rail 14 is disposed 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 are connected to the connecting arm 16.
And a slide portion 18 via a scale operating arm 17, and the slide portion 18 is movably supported by guide portions 12 a of the vertical rails 12 and 13. Therefore, the horizontal rail 14 and the horizontal scale 15 can move along the surface of the drawing board 11.

A tray 19 for holding drawing tools and the like is provided on the near side (lower side in FIG. 1) of the drawing board 11. The two slide portions 18 supported on the vertical rails 12 and 13 respectively include the vertical rails 12 and 13 and the tray 19.
Are connected to each other by a wire 21 (see FIG. 5) passing through the inside of the tray. The tray 19 is provided with an operation lever 22 for holding the wire 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 the connecting arm 16 is provided on an upper surface of a portion of the connecting plate 24 protruding 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 fixed to each other. The tip of the screw 26 is screwed into a female screw 25 a formed at the axis of the knob 25, and the other part of the screw 26 is detented with respect to the connecting arm 16. 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.

An extension 12b is formed below the guide 12a of the vertical rail 12 so as to project in a direction opposite to the direction of the drawing plate 11, and a protector 27 is provided at the tip 12c of the extension 12b.
Is attached. The protectors 27 are provided over the entire length of both sides of the drawing board 11 and cover the guide portions 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.

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

The slide section 18 has a chevron bracket 32. A pair of guide rollers 31 are rotatably provided on the bracket 32, and the guide rollers 31
2, 13 are engaged with the guide portion 12a. A fixing plate 33 is provided on the bracket 32, and the bracket 32 and the fixing plate 33 are fixed by bolts 34. The wire 21 is sandwiched between the bracket 32 and the fixing plate 33,
Thereby, 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
Is rotatably supported. That is, the scale operating arm 17 is swingable 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 swing 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 a nut 38 is screwed to the protruding end. A roller 36 is rotatably provided on the pin 37. As shown in FIG. 3, the roller 36 rolls on the upper surface of the vertical rail 12 and immediately above the guide portion 12a. 1
7 is inserted 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 drafter replaces the drafting paper, the scale operating arm 17 is rotated around the pin 35, or the horizontal rail 14 (not shown in FIG. 4) as shown by a two-dot chain line. May be rotated to separate the horizontal scale 15 from the surface of the drawing board 11. A 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, etc.
6 is located closer to the drawing board 11 than the rotation center. Therefore, even when the drawing board 11 is used in an upright state (the state of FIG. 4), the horizontal rail 14 and the horizontal scale 15 are used.
4 is always inclined so as to be parallel to the drawing plate 11, and FIG.
Does not rotate as shown by the two-dot chain line, and does not hinder the drawing operation.

On the other hand, a slit 4 through which the scale operating arm 17 can be inserted is provided on the protruding portion 12b of the vertical rail 12 in the vicinity of the tray 19 (see FIG. 1) of the drawing plate 11.
1 is formed. As shown in FIGS. 6 and 7, the end portions of the vertical rail 12 and the protector 27 and the slit 4
A fixed cap 42 and a rotating cap 43 are provided at a portion close to the end of the first. The rotating cap 43 is rotatably supported by the vertical rail 12, and connects the end of the vertical rail 12 to the end of the protector 27 when engaged with the fixed cap 42. When the rotating cap 43 is rotated to the protector 27 side to open the end of the slit 41, the scale operating arm 17 can be inserted through the slit 41, and the horizontal rail 14 and the horizontal scale 15 are attached to the back of the drawing board 11. Can be accommodated on the side. The length of the slit 41 is longer than the scale operation arm 17, and more specifically, is longer than the total length of the scale operation arm 17 and the width of the horizontal rail 14. Therefore, as shown in FIG. 4, the slide portion 18 can move to the vicinity of the upper end of the slit 41, whereby the horizontal rail 14 and the horizontal scale 15 are completely accommodated in the back surface of the drawing board 11.

As described above, the present embodiment employs the vertical rail 12
A slit 41 through which the scale operating arm 17 can be inserted is formed near the end of the drawing plate 11 in the projecting 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. FIG. 11
The horizontal rail 14 can be used even when the
And the horizontal scale 15 does not inadvertently fall forward, and the drafting operation is not hindered.

FIG. 8 shows a second embodiment. First
The configuration different from that of the first embodiment is that a fixing cap 42 is also provided on a portion of the vertical rail 12 on the protector 27 side, and the slit 4
1 is that the end is always open. Other configurations are first
This is the same as the embodiment. According to the second embodiment, the same effects as those of the first embodiment can be obtained.
With regard to the strength of the vertical rail 12 near the first embodiment, the first embodiment is more preferable.

[0020]

As described above, according to the present invention, the effect that the attitude of the horizontal scale can be always stabilized even when the drawing board is used in an upright state is obtained.

[Brief description of the drawings]

FIG. 1 is a top view of a drawing plate provided with a horizontal scale support device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of 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 plate is used in an upright state.

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

FIG. 6 is a perspective view of the vicinity of a slit of the drawing plate as viewed from below the drawing plate.

FIG. 7 is a front view showing the vicinity of a fixed cap and a rotating cap of the drawing plate.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Drawing board 12 Vertical rail 12a Guide part 15 Horizontal scale 17 Scale operation arm 18 Slide part 36 Roller

Claims (4)

(57) [Claims] 1. A vertical rail having a guide portion extending along both side portions of a drawing board, a slide portion movably supported by the guide portion, and attached to the slide portion and perpendicular to a surface of the drawing board. A scale operating arm that oscillates in a plane, and is connected to the oscillating end of the scale operating arm, and the slide portion moves along a vertical rail,
A horizontal scale that moves along the surface of the drawing board; and a roller that is rotatably provided at a swinging end of the scale operating arm. The horizontal scale of the parallel ruler, wherein the center of gravity of the member connected to the arm is positioned closer to the drawing board than the center of rotation of the roller even when the drawing board is used in an upright state. Support device. 2. The apparatus according to claim 1, wherein a protector is provided to cover the guide, and an opening is formed between the vertical rail and the protector over the entire range in which the horizontal scale moves on the drawing board. A horizontal scale support device for the parallel ruler according to 5. 3. The horizontal scale support device according to claim 2, wherein the scale operation arm is inserted through the opening. 4. The horizontal scale support device of the parallel ruler according to claim 1, wherein said roller rolls immediately above said guide portion.