JP2992946B2 - Drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drafting machine, and more particularly, to a carriage slidable along a vertical rail on a drafting board, a handle for holding a scale, and connecting the handle to the carriage. And a link part to
The present invention relates to a drafting machine in which a handle portion is pivotally mounted on a link portion so as to be rotatable around an axis parallel to a vertical rail.

[0002]

2. Description of the Related Art In a drafting machine as described above, for example, when a drafting sheet is placed on a drafting board or when a drafting sheet that has been created is removed from the drafting board, the handle portion and the scale held there are raised. Pivoted toward the side and held at an angle of approximately 90 degrees with respect to the drafting board, thereby quickly placing drafting paper on the drafting board or removing prepared drafting paper from the drafting board. It can be carried out.

[0003]

Conventionally, when a handle portion fixed at an angle position of about 90 degrees with respect to a drafting board and a scale held thereon are rotated downward and returned to the drafting board. For this purpose, it is necessary for the user to attach a hand to the handle portion or the scale to perform a downward pivotal movement. That is, if you rotate the handle or scale downward without putting your hand on it, the handle and the scale held there will be accelerated due to gravity and collide with the drawing board with a large impact It is because it will be. However, in practice, it is difficult to always require the user to attach the hand to the handle portion or the scale when the handle portion and the scale held there are turned downward, and it is difficult to handle the handle portion and the scale held there. Frequently, the scale may impinge on the drafting board, which can damage the handle and the scale.

It is therefore an object of the present invention to provide a drafting machine of the type described above in which the handle and the scale held thereon are prevented from colliding with the drafting board when pivoting downward. It is to provide a configured drafting machine.

[0005]

According to the present invention, there is provided a drafting machine comprising a carriage portion slidable along a vertical rail on a drafting board;
A handle portion for holding the scale and a link portion connecting the handle portion to the carriage portion are included, and the handle portion is pivotally mounted on the link portion so as to be rotatable around an axis parallel to the vertical rail. . According to the present invention, in such a drafting machine, a small resistance is given when the handle is turned upward away from the drawing board, but a large resistance is given when the handle is turned downward toward the drawing board. And a speed-reducing means for reducing the rotational movement of the handle portion in the downward direction is incorporated in a shaft attachment portion between the handle portion and the link portion.

[0006] In the drafting machine according to the invention, preferably, the speed reduction means is in the form of a fluid dashpot.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a drafting machine according to the present invention. As shown in FIG. 1, in the present embodiment, a drafting machine includes a horizontal rail 12 extending along an upper edge of a drafting board 10, and a vertical rail 14 movable in the horizontal direction along the horizontal rail 12. And In short, the upper end of the vertical rail 14 is slidably incorporated in the horizontal rail 12 in the horizontal direction, and the lower end thereof is slidably supported on the lower edge of the drafting board 10, and thus vertically. The rail 14 is movable on the drawing board 10 in the direction indicated by the arrow A in FIG.

As best shown in FIGS. 2 and 3,
The vertical rail 14 is provided with a carriage 16 that can slide along the rail, and a handle 18 is connected to the carriage 16 via a link 20. Handle part 1
A scale mounting plate 22 extends from 8, and a horizontal scale 24 and a vertical scale 26 are mounted on the scale mounting plate 22. As is well known, the handle portion 18 is rotatable around its central axis while holding both scales 24 and 26, and can be locked at any rotational position.

The handle portion 18 has a connecting member 28 extending therefrom.
Is attached to the shaft. More specifically, as shown in FIG. 4, the connecting member 28 is formed with a concave portion 30 for accommodating one end of the link portion 20.
Inside, it is axially attached to the link portion 20 by the long shaft 32. The long shaft 32 is rotatably inserted through a corresponding end of the link portion 20, and both ends of the long shaft 32 are fixed to the connecting member 28 by appropriate set screws (not shown). Reference numeral 34 denotes a bearing for rotatably supporting the long shaft 32.

On the other hand, the link section 20 is also provided on the carriage section 16.
A concave portion 36 for accommodating the other end portion is formed,
The carriage section 16 has a pair of short axes 38 in the recess 36,
The shaft 38 is attached to the link portion 20 by 38. A pair of short axes 3
8, 38 are screwed to the carriage 16 on both sides of the recess 36, the inner end of each short axis being formed as a conical end. Bearings 40 are provided on opposite sides of the other end of the link portion 20, each bearing 40 receiving a conical end of its corresponding short shaft 38.

By connecting the handle portion 18 to the carriage 16 in the above-described manner, the handle 18 is rotatable around an axis parallel to the vertical rail 16, and the handle portion 18 and the scale 24 held there are provided. And 26 are pivoted upward away from the drafting board 10 and remain at an angle of approximately 90 degrees with respect to the drafting board, thereby placing drafting paper on the drafting board or from the drafting board. Can be promptly removed.

In the present embodiment, a small resistance is applied to the shaft attachment portion between the one end portion of the link portion 20 and the connecting member 28 when the handle portion 18 is rotated upward away from the drafting board 10. When the handle portion 18 is turned downward toward the drafting board 10, a speed reducing means for reducing the turning motion of the handle portion 18 downward by applying a large resistance is incorporated, and this speed reducing means is preferably a fluid type. It is in the form of a dashpot.

More specifically, the speed reduction means is incorporated in a reduced diameter portion 42 formed substantially at the center of the long shaft 32, and the reduced diameter portion 42 is formed into a cylindrical bore 44 formed in the link portion 20.
Is placed within. As best shown in FIG.
A projecting piece 46 is projected from the reduced diameter portion 42 in the radial direction, and the free end of the projecting piece 46 is slidably brought into contact with the inner surface of the cylindrical bore 44 when the long shaft 32 rotates. FIG.
As is apparent from FIG. 5, a pair of openings 48, 48 having a large opening area are formed in the projecting piece 46, and a reed valve is provided on one side of these openings 48, 48, that is, on the left side in FIG. 50 are provided. The reed valve 50 is formed of, for example, a flexible synthetic resin sheet material, and one edge of the reed valve 50 is fixed to the protruding piece 46 with a set screw element 52. The angular position of the projecting piece 46 varies according to the turning position of the handle portion 18, but when the handle portion 18 is placed on the drafting board 10, the angular position of the projecting piece 46 is shown in FIG. Position.

On the other hand, the link portion 20 is provided in the cylindrical bore 44.
A protruding piece 54 integrally extending from the protruding piece is provided, and the protruding piece 54 is positioned substantially diametrically with respect to the position of the protruding piece 46 shown in FIG. When the long shaft 32 rotates, the projecting piece 54
Is in sliding contact with the surface of the reduced diameter portion 42, and the projecting piece 54 is formed with a passage 56 having a small opening area.

As shown in FIG. 4, O-ring seals 58 are provided on both sides of the cylindrical bore 44 in the long shaft 32, and the airtightness of the cylindrical bore 44 is maintained.

The operation will now be described.
Is rotated upward away from the drawing board 10, the reduced diameter portion 42 of the long shaft 32 is rotated in the direction indicated by the arrow B in FIG. Accordingly, the protruding piece 46 advances in the counterclockwise direction (FIG. 5) toward the protruding piece 54, and the space therebetween is gradually narrowed, from which the air passes through the opening 48 having a large opening area and the reed valve 50. It can easily move to the opposite space. Thus, a large resistance is not given to the upward pivoting movement of the handle portion 18. On the other hand, when the handle portion 18 is turned downward toward the drafting board 10, that is, when the reduced diameter portion 42 of the long shaft 32 is turned in the direction opposite to the arrow B, the projecting piece 46 projects. Proceeding clockwise (FIG. 5) towards the piece 54, the space therebetween is progressively narrowed, with the air in that space only moving to the opposite space via a passage 56 having a small open area. Therefore, the rotational movement of the handle portion 18 toward the drafting board 10 is reduced. Thus, the handle portion 18 and the scales 24 and 25 held thereon are prevented from colliding with the drawing board 10 with a large impact.

The projecting piece 4 with respect to the inner surface of the cylindrical bore 44
6 to keep the sliding contact of the free end of the cylinder 6 airtight, and to keep the sliding contact of the free end of the projecting piece 54 against the surface of the reduced diameter portion 42 in an airtight state. It is preferable to apply a lubricant such as grease to the surface of the reduced diameter portion 42, whereby the deceleration effect at the time of the downward pivotal movement of the handle portion 18, the scales 24, 25 and the like can be further enhanced.

In the deceleration means described above, air is used as the deceleration fluid. However, other fluids, such as viscous oil, may be used.

[0019]

As is apparent from the above description, according to the present invention, the handle portion and the scale held thereon are prevented from colliding with the drawing board with a large impact, so that they are inadvertently handled. To prevent damage.

[Brief description of the drawings]

FIG. 1 is a plan view showing a drafting machine according to the present invention together with a drafting board.

FIG. 2 is an enlarged elevation view showing a main part of the drafting machine shown in FIG.

FIG. 3 is an enlarged plan view of a main part of the drafting machine shown in FIG.

FIG. 4 is a partially broken plan view showing a further enlarged part of a main part of the drafting machine shown in FIG. 3;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drafting board 12 Horizontal rail 14 Vertical rail 16 Carriage 18 Handle part 20 Link part 22 Scale mounting plate 24 Horizontal scale 26 Vertical scale 28 Connecting member 30 Depression 32 Long axis 34 Bearing 36 Depression 38 Short axis 40 Bearing 42 Reduction diameter part 44 Cylindrical Diameter bore 46 Projecting piece 48 Opening 50 Reed valve 52 Stop screw element 54 Projecting piece 56 Passage 58 O-ring seal

Claims (2)

(57) [Claims] 1. A handle unit comprising a carriage unit slidable along a vertical rail on a drafting board, a handle unit for holding a scale, and a link unit connecting the handle unit to the carriage unit. Is attached to the link portion so as to be rotatable around an axis parallel to the vertical rail, wherein the handle portion is small when the handle portion is turned upward away from the drawing board. When the handle portion is turned downward toward the drafting board, the handle portion and the link are provided with a large resistance to reduce the turning motion of the handle portion in the downward direction. A drafting machine characterized in that it is incorporated in a shaft attachment portion between the first and second portions. 2. A drafting machine according to claim 1, wherein said speed reducing means is in the form of a fluid dashpot.