JPH0118398Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base line fixing device at the head of a universal parallel ruler.

An object of the present invention is to provide a baseline fixing device that can removably fix a protractor at a predetermined angle to a fixing plate accurately without play.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 designates a drawing board, to which a horizontal rail 4 is fixed, and one end of a vertical rail 6 is movably attached to the horizontal rail 4 via a horizontal cursor 8. 1
0 is a vertical cursor movably attached to the vertical rail 6, and a known double hinge mechanism 12 is attached to this.
A fixing plate 16 of the head 14 is connected to the head 14 via. A rising portion 16a is fixed to the fixed plate 16. Pipe portion 16 formed on fixed plate 16
An index surface 16c consisting of a notched flat surface is formed on the side surface of b. Elongated holes 18 and 20 are formed through the fixing plate 16 in a direction extending in the radial direction of a circle centered on the tube portion 16b, and an elongated hole 22 is formed in a direction perpendicular to the elongated hole 18. It is connected and transparent. Reference numeral 24 designates a baseline index lever having protrusions 26 and 28 provided at both ends of a U-shaped portion, and the protrusions 26 and 28 are connected to the elongated holes 18 and 28, respectively.
20 in a slidable manner. the protrusion 26,
The elongated holes 18, 20 and the protrusion 26 are arranged so that the side surface 24a of the lever 24 can be brought into close contact with the index surface 16c parallel to the index surface 16c as shown in FIG. ,2
8 and the lever side surface 24a are set. Reference numeral 30 denotes a presser plate screwed to the upper surface of the fixed plate 16, and its lower surface prevents the lever 24 from moving upward.
A spring 32 is attached to the presser plate 30, and the spring 3
2 elastically contacts the protrusion 24b of the lever 24, urging the lever 24 in the upward arrow direction in FIG. Reference numeral 34 designates an external tube body fixed to the tube portion 16b with a nut 36, into which a main shaft 38 is rotatably fitted. A mounting plate 40 is fixed to the upper part of the main shaft 38 with a nut, and a handle 42 is fixed to the mounting plate 40. 44 is a protractor,
This tube portion is rotatably fitted to the outer peripheral surface of the outer tube body 34. Reference numeral 46 denotes an arc-shaped guide member fixed to the upper surface of the protractor 44, and slopes 46a, 46 are provided on both end surfaces of the guide member in correspondence with the protrusions 26, 28.
6b is formed. Inclined surface 4 of the member 46
6a, 46b, the lever 24, the index surface 16c of the tube portion 16b, and the protrusions 26, 28 are connected to the protractor 4.
4 to the fixed plate 16 side at a predetermined angle.

A reference vernier plate 48 is fixed to the fixed plate 16, and is slidably fitted into the circumferential groove of the protractor plate 44. 50 is a board fixed to the lower end flange of the main shaft 38, and a ruler mounting plate 52 is mounted on this board, and straight rulers 54, 56 are mounted on the ruler mounting plate 52.
is fixed. Reference numeral 58 denotes a conical rod disposed inside the main shaft 38. One end of an index release lever 60 is connected to the upper end of the conical rod 58, and a transmission plate 62 is connected to the lower end of the conical rod 58. Reference numeral 64 designates an index pawl, one end of which is rotatably supported by a shaft 66 on the substrate 50, and an intermediate portion of the index pawl 64 is rotatably connected to the transmission plate 62 by a shaft 68. The transmission plate 62 is elastically pushed to the left in FIG. 74 is fitted. Reference numeral 76 indicates a bottom plate to which the substrate 50 is fixed, and a cover 78 is attached to this.

Next, the operation of this embodiment will be explained.

First, the index claw 64 fits into the index recess 74 corresponding to the zero degree, and fixes the main shaft 38 and the ruler mounting plate 52 to the protractor plate 44 side. Next, the lever 24 is rotated about the protrusion 28 in the counterclockwise direction of rotation of the hour hand in FIG. This results in
The lever 24 is movable along the elongated holes 18 and 20 in the arrow direction, and the projection 2 is moved by the elasticity of the spring 32.
6 and 28 are in elastic contact with the inner or outer surface of the member 46. In this state, the handle 42 is rotated to bring the inclined surfaces 46a, 46b of the member 46 into contact with the protrusions 26, 28. The protrusions 26 and 28 move along the inclined surfaces 46a and 46b due to the elastic force of the spring 32. By the movement of the protrusions 26, 28 along the inclined surfaces 46a, 46b, the side surface 24a of the lever 24 is guided toward the index surface 16c, and the inner surface 24 of the lever 24 is guided toward the index surface 16c.
A is brought into close contact with the index surface 16c as shown in FIG. 5A. Moreover, the protrusions 26 and 28 are formed on the inclined surface 46.
a, 46b are pressed and pressed, and the projections 26, 28 prevent the member 46 from rotating about the tube portion 16b in the hour hand and counter-hour hand rotation directions. As a result, the member 46 is fixed to the lever 24, and since the lever 24 is closely fixed to the index surface 16c of the tube portion 16b, the protractor 44 that interlocks with the member 46 is determined by the index surface 16c. It is fixed to the fixed plate 16 side at a predetermined angle. In this state, if the horizontal ruler 54 is set in advance to be parallel to the horizontal rail 4, for example, the axis line assumed on the drawing board 2 parallel to the longitudinal direction of the horizontal rail 4 will become a freely parallel ruler. This is the baseline.
Release the fixed state of the protractor plate 44 to the fixed plate 16, and set the protractor plate 44 at any angle relative to the fixed plate 16.
When it is desired to rotate the lever 24, the lever 24 is pushed in the direction opposite to the upper arrow direction in FIG. . As a result, the fixation of the member 46 to the lever 24 is released, and the protractor 44 is released.
is in a state where it can freely rotate about the outer circumferential surface of the outer tubular body 34 with respect to the fixed plate 16. When the lever 24 is swung about the protrusion 28 in the rotational direction of the hour hand in FIG.

Since the present invention is constructed as described above, it has the effect of being able to fix the protractor board at a predetermined angle on the fixed plate side without play with a simple mechanism.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of the universal parallel ruler, Fig. 2 is a sectional view of the head, Fig. 3 is a plan view of the main parts, Fig. 4 is the same, an exploded perspective view, and Fig. 5 is the same, explanatory drawing, FIG. 6 is a plan view showing the relationship between the index ring and the index claw. 2...Drawing board, 4...Horizontal rail, 6...Vertical rail, 8...Horizontal cursor, 10...Vertical cursor, 1
4...Head, 16...Fixing plate, 16b...Pipe section, 16b...Index surface, 18, 20...
Long hole, 22...Long hole, 24...Lever, 26,2
8...Protrusion, 34...External pipe body, 38...Main shaft,
42...handle, 44...protractor, 46a, 4
6b... Inclined surface, 48... Baseline vernier plate, 50
... Board, 52 ... Ruler mounting plate, 54, 56 ...
Straight ruler.

Claims (1)

[Scope of utility model registration request] A protractor plate 44 rotatable with respect to the fixed plate 16 is attached to the fixed plate 1 around the tube part 16b on the fixed plate 16 side.
In this device, a flat baseline index surface 16c is provided on the side surface of the tube portion 16b, and the fixing plate 16 side is provided with a flat baseline index surface 16c.
A pair of elongated holes 18, 20 extending in the radial direction of a circle centered on the tube portion 16b are provided through the elongated holes 18, 20.
20, and has protrusions 26 and 28 that are slidably fitted to the base line index surface 16c.
A lever 24 that can be brought into close contact with the protractor board 44 is disposed on the side of the fixed plate 16, and the lever 24 is elastically pushed in a predetermined direction along the elongated holes 18 and 20 by a spring force.
Inclined surfaces 46a and 46b are provided on the sides of the projections 26 and 28 at positions where they can come into close contact with the projections 26 and 28, and the lever 24 is moved along the long holes 18 and 20 in a predetermined direction by a spring force. the protrusion 26,
28 is in close contact with the inclined surfaces 46a, 46b, and the inclined surfaces 46a, 46 of the protrusions 26, 28
As the lever 24 moves in the opposite direction along the elongated holes 18 and 20, the side surface 24a of the lever 24 comes into close contact with the base line index surface 16c, and as the lever 24 moves in the opposite direction along the elongated holes 18 and 20, the slope surface 46a,
A base line fixing device for a head of a universal parallel ruler, characterized in that the protrusions 26 and 28 are configured to move away from the locus of movement of the ruler 46b.