JP2556458Y2 - 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 floating mechanism for floating a ruler on a drawing board.

[0002]

2. Description of the Related Art Conventionally, a parallel ruler has a ruler mounting plate pivotally attached to left and right carriages so as to be vertically rotatable, and a spring is interposed between the carriage and the ruler mounting plate to attach a tip end portion of the ruler mounting plate upward. I'm going. The ruler connecting the left and right ruler mounting plates rises from the drawing plate by the bias of the spring, and prevents the drawing from being stained or damaged when moving on the drawing plate.

[0003]

In the conventional parallel ruler floating mechanism, a deviation of the flying height occurs for each parallel ruler due to individual differences in the elasticity of the springs supporting the ruler mounting plate. In order to eliminate this deviation, a spring pressure adjusting mechanism is required, which leads to complication of the mechanism and an increase in cost. In addition, even if the adjusting mechanism is provided, there is a problem that the flying height changes depending on the inclination angle of the parallel ruler. further,
When the parallel ruler is raised upright, the ruler and the ruler mounting plate may rise further from the normal floating position and turn downward, which poses a problem that it is difficult to handle when carrying.

[0004] Therefore, the floating amount of the ruler is kept constant without any adjustment without using a complicated adjusting mechanism to make the quality of the parallel ruler uniform and to reduce the cost. Further, the floating amount of the ruler can be reduced irrespective of the standing angle of the drawing board. The technical problem to be solved arises in order to prevent the ruler from reversing and to improve the handleability by regulating, and the present invention aims to solve the above problem.

[0005]

In order to achieve the above object, the present invention provides vertical rails on both right and left edges of a drawing board, engages carriages with the vertical rails, and sets a ruler on each of the carriages. A parallel ruler in which the mounting plate is pivotally attached in a vertically rotatable manner, the left and right ruler mounting plates are connected by a ruler, and a spring is interposed between the carriage and the ruler mounting plate to raise the ruler from the drawing plate. In the above, a carriage and a ruler mounting plate are provided with a rotation range limiting mechanism including a hole and a claw that engages with the hole, and a parallel ruler that restricts the amount of rise of the ruler from the drawing plate is provided. It is.

[0006]

One of the carriage and a ruler mounting plate pivotally attached to the side of the carriage is provided with a claw or a pin, and the other is loosely inserted into a hole or groove provided on the other side to limit the rotation angle of the ruler mounting plate. A mechanism is configured. The ruler mounting plate is urged in the ascending direction by a spring, and the claw or the like abuts on the end of the hole to rise within a range where rotation is restricted, and the ruler mounted on the ruler mounting plate rises from the drawing plate. Even if the elasticity of the spring is excessive, the floating amount of the ruler can be controlled to be constant.

[0007]

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 as shown in FIG.
The rollers 8, 8 of the carriages 6, 7 are engaged in the vertical rails 3, 4 through 4a.

[0008] As shown in FIG.
7 are linked with pulleys 9, 10, 11, 1
2, 13 and 14 and an endless wire 15. Each of the vertical rails 3 and 4 has one pulley 9 and 14 at the rear end and two intermediate pulleys 10 and 1 at the front end.
1, 12, 13 are arranged, and the intermediate pulleys 10, 11, 1
The reference numerals 2 and 13 are respectively arranged vertically and freely rotatable separately.

The endless wire 15 passes through a wire cover 16 provided at the front of the pencil case 5 from the pulley 9 of one of the vertical rails 3 via intermediate pulleys 10 and 11 at the front, and the other end of the vertical rail 4. It is wound from the intermediate pulleys 12 and 13 to the rear pulley 14, and crosses one of the intermediate pulleys 10 and 11 and the other intermediate pulleys 12 and 13 to reverse the vertical position. Then, as shown in FIG.
The endless wire 15 is locked by 7, 17 so that the left and right carriages 6, 7 run on the vertical rails 3, 4 in synchronization with each other.

The front end portions of the left and right carriages 6 and 7 (FIG. 1)
Ruler mounting plates 18 and 19 are provided on the side of
It is pivoted via 0,21. Ruler mounting plate 18,1
Reference numeral 9 denotes a bracket part 18a, 19a formed by symmetrically bending the upper part inward, respectively, and as shown in FIG. 6 and 7 are connected.

The carriages 6, 7 and the ruler mounting plates 18, 1
9 is formed symmetrically, and only the right carriage 7 and the ruler mounting plate 19 are shown in FIGS. The torsion coil springs 2 are provided on the support shafts 20 and 21 of the ruler mounting plates 18 and 19.
And one end 23a of the torsion coil springs 23, 23 is engaged with the upper surfaces of the carriages 6, 7 and the other end 2
3b is a bracket portion 18a, 1 of the ruler mounting plates 18,19.
The ruler mounting plates 18 and 19 are pushed upward by elastic contact with the back surface of the reference numeral 9a, and the rulers 22 mounted on the ruler mounting plates 18 and 19 are lifted from the drawing plate 2 as shown in FIG.

As shown in FIG. 1, circular holes 24, 24 are formed in front and rear intermediate portions of the side surfaces of the carriages 6, 7, and the claws 25, 25 are directed inward from the lower edges of the ruler mounting plates 18, 19, respectively. 2 and 3, as shown in FIG. 2 and FIG.
Are loosely inserted into the holes 24, 24. Therefore, the ruler mounting plates 18 and 19 rotated upward by the urging of the torsion coil springs 23 and 23 have the claw 25 abutting against the upper edge of the hole 24 to restrict the floating amount of the ruler 22.

As described above, the rotation range of the ruler mounting plates 18 and 19 with respect to the carriages 6 and 7 is limited to a predetermined amount, and the normal rotation operation of bringing the ruler 22 into contact with the drawing plate 2 is not limited. Thus, the positional relationship between the holes 24, 24 and the claws 25, 25 is set. The present invention should not be limited to the above embodiment. For example, although not shown, a compression coil spring or the like may be used instead of the torsion coil spring 23.
In addition, contrary to the above embodiment, various modifications can be made such as providing the claws 25 on the carriages 6 and 7 and providing the holes 24 on the ruler mounting plates 18 and 19, and the present invention is not limited to these modified ones. Of course.

[0014]

As described in detail in the above embodiment, the present invention limits the floating amount of the ruler mounting plate and the ruler by engaging the claw or the pin with the hole or the groove. The floating amount of the ruler becomes constant regardless of the individual difference of the constant and elasticity and the installation inclination angle of the parallel ruler, so that a complicated floating amount adjusting mechanism becomes unnecessary. In addition, even when the drawing plate is raised, the ruler does not turn downward because the floating amount of the ruler is limited, and the parallel ruler does not increase costs, such as improved handling during transportation. It is a device that can improve the quality and function of the product.

[Brief description of the drawings]

FIG. 1 is a plan view of a parallel ruler.

FIG. 2 is a partially cutaway plan view showing a right carriage portion.

FIG. 3 is a side view of a right carriage portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parallel ruler 2 Drawing board 3,4 Vertical rail 6,7 Carriage 18,19 Ruler mounting plate 22 Ruler 23 Torsion coil spring 24 Hole 25 Claw

Claims (1)

(57) [Scope of request for utility model registration] 1. A vertical rail (3, 4) is provided on both left and right edges of a drawing board (2), and carriages (6, 7) are engaged with the vertical rails (3, 4), respectively. 6,7)
Are attached to each of the ruler mounting plates (18, 19) so as to be freely rotatable in the vertical direction, and the right and left ruler mounting plates (18, 19) are
2) and the carriage (6, 7)
A parallel ruler in which the ruler (22) floats from the drawing plate (2) by interposing a spring (23) between the ruler and the ruler mounting plates (18, 19). Mounting plate (1
8, 19) is provided with a rotation range limiting mechanism including a hole (24) and a claw (25) engaged with the hole (24), and the ruler (22) is lifted from the drawing plate (2). Parallel ruler characterized by regulating the amount.