JP2595555Y2 - 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 used for drafting work, and more particularly to a brake device for fixing a ruler on a drawing board.

[0002]

2. Description of the Related Art In a parallel ruler, carriages are respectively engaged with vertical rails provided on both right and left edges of a drawing board, and left and right carriages are connected by a ruler. In order to move the ruler in parallel, the left and right carriages are configured to interlock with pulleys disposed at both ends of the vertical rail by a synchronization mechanism using a wire or a belt.

In general, a stationary parallel ruler is provided with a brake device, and the ruler can be fixed at an arbitrary position on the drawing board. The brake device is provided on the carriage, and brakes the carriage and the ruler by pressing the brake piece against the vertical rail.

[0004]

In the above-described conventional brake device, the brake piece and a link mechanism for operating the brake piece are incorporated in the carriage, so that the carriage becomes large, and the cross-sectional shape of the vertical rail is reduced. Must match the configuration. Therefore, in terms of external dimensions and cost, A2
In some cases, it is difficult to employ a brake device for an inexpensive small parallel ruler such as a size.

However, when transporting a parallel ruler provided with no brake device, the ruler unexpectedly moves, causing a problem in portability, and vibration of the ruler causes an impact on the mechanism, resulting in mechanical accuracy and durability. Therefore, it is desirable to provide a brake device on the small parallel ruler as well, because it may adversely affect the performance. Accordingly, an object of the present invention is to provide a parallel ruler provided with a brake device that can securely fix a carriage without causing problems such as a complicated structure of a carriage or a rail, an increase in weight, and an increase in cost. .

[0006]

SUMMARY OF THE INVENTION The present invention is proposed to achieve the above-mentioned object. A pulley is provided at one end of a vertical rail provided on both right and left edges of a drawing plate, and a pulley is provided at the other end. And two endless pulleys are respectively wound around the left and right pulleys via the intermediate pulleys, and the carriages respectively engaged with the vertical rails are engaged with the endless wires so as to be left and right. In a parallel ruler provided with a carriage synchronization mechanism for interlocking the carriage, a wire cover for covering an endless wire spanned between the left and right intermediate pulleys is provided, and a wire clamp or a screw or a cam lever or the like is provided in the wire cover. A parallel ruler is provided in which a device is arranged, a window is opened in the wire cover, and an operation portion of the wire clamp device is projected outward.

[0007]

The endless wires of the synchronizing mechanism for interlocking the left and right carriages are routed into the left and right vertical rails via a horizontal wire cover. A wire clamp device for clamping an endless wire is provided in the wire cover, and an operation unit such as a knob or a lever of the wire clamp device projects outward from a window provided in the wire cover.
When the operation unit is operated to clamp the endless wire, the carriage and the ruler connected to the endless wire are fixed. When the pressing is released, the ruler can freely move in parallel on the drawing board.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a parallel ruler 1 in which vertical rails 3 and 4 are mounted along both left and right edges of a drawing board 2, and a concave pencil case 5 covering the entire width of the drawing board 2 is fixed to a front edge. I have.
The hollow vertical rails 3 and 4 have guide grooves 3 in the longitudinal direction of the outer surface.
a, 4a are opened, and rollers (not shown) of the carriages 6, 7 are engaged with the vertical rails 3, 4 through the guide grooves 3a, 4a.

Ruler mounting plates 8 and 9 are pivotally attached to the side surfaces of the carriages 6 and 7, respectively. The left and right carriages 6 and 7 are connected by fixing both ends of the ruler 10 to the ruler mounting plates 8 and 9, respectively. . The synchronization mechanism for interlocking the left and right carriages 6 and 7 is constituted by pulleys 11, 12, 13, 14, 15 and 16 and an endless wire 17. On the vertical rails 3, 4, one pulley 11, 16 at the rear end portion and two intermediate pulleys 12, 13, 14, 15 at the front end portion are disposed, and the intermediate pulleys 12, 13, 14, 15 are provided. Are arranged on the upper and lower sides to be freely rotatable independently of each other.

An endless wire 17 is connected to a wire cover 18 provided at the front of the pencil case 5 from the pulley 11 of one of the vertical rails 3 via intermediate pulleys 12 and 13 at the front.
And is wound from the intermediate pulleys 14 and 15 of the other vertical rail 4 to the pulley 16 at the rear, and intersects between the intermediate pulleys 12 and 13 and the other intermediate pulleys 14 and 15. The vertical position is reversed. Then, the carriages 6 and 7 are each locked at one point of the endless wire 17, and the left and right carriages 6 and 7 run in synchronization with each other.

A wire clamp device 19 as a brake mechanism is provided near one end of a wire cover 18 provided at a front portion of the pencil case 5, and a knob of the wire clamp device 19 is opened through a window 20 opened in the front surface of the wire cover 18. 21 is projected. As shown in FIG. 2, the wire clamp device 19 is attached to a side wall 4 b of the vertical rail 4 via a bracket 22. The bracket 22 is fixed to the vertical rail 4 by screws 23, 23, and is provided with a boss 22b on a rising portion 22a bent in an L shape in plan view. A stud bolt 24 is implanted in the boss 22b, a washer 25 is loosely inserted into the stud bolt 24, and a nut 26 provided with a knob 21 is screwed into the boss 22b.

As shown in FIG. 3, a stud bolt 24 is provided with two endless wires 17a,
The endless wires 17a and 17b pass between the washer 25 and the boss 22b as shown in FIG. 2 by setting the diameter of the washer 25 to be larger than the distance between the upper and lower endless wires 17a and 17b. It is formed as follows.

In a state in which the knob 21 is rotated to loosen the nut 26, the endless wire 17 is not hindered from running as shown in FIG. 2, and the ruler 10 on the drawing board 2 can be freely moved. . Then, when it is necessary to fix the ruler 10 at the time of drawing or when carrying the parallel ruler 1,
By tightening the nut 26, the two endless wires 17a,
17b is clamped between the boss 22b and the washer 25 to be braked, and the carriages 6, 7 and the ruler 10 are fixed.

The structure of the wire clamp device 19 is not limited to the stud bolt 24 and the nut 26 of the above embodiment, and a cam lever 29 is pivotally mounted on a shaft 28 projecting from a bracket 27 as shown in FIG. Cam lever 29
Various modifications can be made, such as forming the endless wire 17 so as to clamp the endless wire 17 by the turning operation. And it goes without saying that this invention extends to those modifications.

[0015]

According to the present invention, as described in detail in the above-described embodiment, the carriage is synchronously braked by pressing the endless wire of the carriage synchronization mechanism using the endless wire. Can be fixed. Therefore, compared with the conventional brake device incorporated in the carriage, this is a practically valuable device capable of minimizing the complexity of the structure of the carriage, increasing the size and weight of the parallel ruler, and increasing the cost. .

[Brief description of the drawings]

FIG. 1 is a plan view of the parallel ruler of the present invention.

FIG. 2 is a plan sectional view showing a wire clamp device.

FIG. 3 is an explanatory front view showing the wire clamp device.

FIG. 4 is a plan sectional view showing a wire clamp device according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parallel ruler 2 Drawing board 3,4 Vertical rail 5 Pencil case 6,7 Carriage 11,16 Pulley 12,13,14,15 Intermediate pulley 17 Endless wire 18 Wire cover 19 Wire clamp device 20 Window

Claims (1)

(57) [Scope of request for utility model registration] A pulley (11, 16) is disposed at one end of a vertical rail (3, 4) provided at both left and right edges of a drawing board (2), and two intermediate pulleys are provided at the other end, respectively. (12,13,1
4, 15), the endless wire (17) is wound around the left and right pulleys (11, 16) via the intermediate pulleys (12, 13, 14, 15), and the vertical rail (3, 15) is wound. , 4) in a parallel ruler provided with a carriage synchronization mechanism for locking the carriages (6, 7) engaged with the endless wires (17) and interlocking the left and right carriages (6, 7). Left and right intermediate pulleys (12, 1
Endless wire (1)
7) A wire cover (18) is provided to cover the wire cover (18), and a wire clamp device (19) using a screw or a cam lever is disposed in the wire cover (18).
8) A parallel ruler characterized in that a window (20) is opened in 8) so that an operation portion of the wire clamp device (19) projects outward.