JPS5848160Y2 - Floating and holding device for the head of a free parallel ruler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating device for the head of a universal parallel ruler.

Conventionally, in a track-type flexible parallel ruler, a cursor-side support fixed to a cursor plate movable along a vertical rail, and a head-side support fixed to a scale operation head are attached at the ends of both supports. The scale is connected to the drawing board by a parallel movement device including at least one link member pivotally connected to each other, and the head side support is maintained substantially parallel to the cursor side support and floated. A floating holding device for the head part is known, which can lift the scale parallel to the drawing board and hold the scale floating at a predetermined height from the drawing board, as well as easily return the scale to the same base. ing.

By the way, in this type of conventional device, the floating blade of the leaf spring is substantially strengthened by, for example, changing the contact position between the leaf spring that provides the floating blade to the head portion and the member that abuts it. It was complex in principle and structure.

Therefore, the present invention aims to provide a floating and holding device for the head portion of a universal parallel ruler, which can obtain the same effect with a simpler structure.

The apparatus of the present invention will be described in detail with reference to the embodiments shown below. Reference numeral 1 denotes a vertical rail of a track type universal parallel ruler, along the lower surface of which a cursor plate 2 is guided in a freely movable manner.

Reference numeral 3 designates a cursor-side support body integrally fixed on the cursor plate 2, and includes a pair of support frame portions 3a.

Reference numeral 4 denotes a link member, one end of which is rotatably connected to the support frame 3a by a pivot shaft.

Pl indicates the axial center position.

Reference numeral 5 denotes a head-side support member fixed to the scale operation head, and is provided with a support frame portion 5a similar to the support frame portion 3a of the cursor-side support member 3.

It is rotatably connected to the other end of the link member 4 by a pivot shaft.

P2 indicates the axial center position. Further, although not shown in the figure, below the link member 4, between the cursor side support 3 and the head side support 5, there is an axial center position P1. Axial center position P3, which forms a substantially parallelogram with P2.
Other link members or cam members, etc. that are interlocked with P4 are provided so that the head side support 5 can maintain parallel to the cursor side support 3 and float near the drawing surface. It is composed of:

Incidentally, since the above-mentioned parallel movement device of the cursor side support 3 and the head side support 5 is conventionally known, the important point in the present invention is that the surface supports 3 and 5 have at least one link. They are connected by a parallel motion device including member 4.

In the above-mentioned configuration, in the illustrated embodiment of the head floating and holding device according to the present invention, the support piece 6 is fixed on the cursor plate 2 of the support frame 3a of the cursor side support 3 with a fixing screw. A floating holding member 9 is provided on the support piece 6 so as to be able to stand up and retreat freely around a support shaft 8.

On the other hand, a roller member 11 is provided on the link member 4 so as to be rotatable by a support piece 10, and as shown in FIG. The engagement step portion 9a and the roller member 11 are brought into contact with the member 11, and the floating holding member 9 is in the retracted position as shown in FIG.
The structure is such that the contact with the holder is removed.

The contact relationship between the engagement step portion 9a and the roller member 11 is such that a small rotational moment is applied to the floating holding member 9 in the retracting direction (counterclockwise in FIG. 2) about the support shaft 8 in the upright state. It is configured to do so.

That is, this small rotation moment I is set so that the floating holding member 9 does not retreat due to the load normally applied to the head side support 5 by the head portion and the scale.
It is configured such that the head part is retracted only when the operator applies a downward force to the head part as shown in the third figure.

Reference numeral 12 denotes a notch provided in the floating holding member 9 around the support shaft 8, and a stopper 12 is located within the notch 12.
3 is provided on the support piece 6, and is configured to define the upright position and retracted position of the floating holding member 9.

Reference numeral 14 denotes a return spring for the floating holding member 9, which is wound around the support shaft 8 so that one end 14a is engaged with the floating holding member 9, and the other end 14b is engaged with a pin 15 implanted in the support piece 6. In addition, the floating holding member 9 is provided so as to be able to return freely from the retracted position to the upright position.

According to the head floating and holding device according to the present invention having the above-described configuration, when the head side support body 5 is lifted upward from the state shown in the second figure by holding the head portion (not shown), the floating and holding member 9 is placed in the upright position shown in the figure by the return spring 14, and then when the head side support body 5 is lowered, the roller member 11 comes into contact with and is supported by the engagement stepped portion 9a, and when the head portion is released, the roller member 11 is supported. The floating holding member 9 also acts as a stopper, and the head portion and scale, which are integral with the head side support 5, are held in a floating state.

In this floating state, the scale can be moved, drawings can be replaced, and drawing boards can be cleaned easily.

When the head is further held and a force is applied in the downward direction to the head side support 5, the rotational moment in the retracting direction applied to the floating holding member 9 via the roller members 11 increases, which in turn increases the floating holding member 9. The member 9 rotates in the retracting direction about the support shaft 8, and the head side support body 5 returns to the position where the head portion and the scale are in contact with the drawing surface as shown in the third figure.

Note that, contrary to the embodiment, it is also possible to provide the floating holding member 9 on the link member 4 so as to be able to stand up and retreat freely, and to provide the roller member 11 on the cursor side support member 3 based on the same principle.

As described above, according to the floating holding device according to the present invention, in the flexible parallel ruler in which the cursor side support and the head side support are connected by the parallel movement device including the link member, the cursor side support and the link member are connected. In between, a floating holding member that supports the link member in a floating state in the upright position is retractably provided, and the floating holding member is provided so as to be able to return from the retracted position to the upright position. A simple and reliable floating holding device in which the floating holding member uses its rigidity to support the head and scale in a floating state, and returns them to the drawing board by retracting them, without using the strong support action of springs. There are effects that can be provided.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the main parts of an embodiment of the device of the present invention, Fig. 2 is a front view showing the main parts in the floating and holding state, and Fig. 3 is a front view showing the main parts in the retracted state. It is. 1: vertical rail, 2: cursor plate, 3: cursor side support, 4: link member, 5: head side support, 9: floating holding member, 11: roller member, 14: return spring.

Claims (1)

[Scope of utility model registration request] A cursor-side support fixed to a cursor plate movable along a vertical rail and a head-side support fixed to a scale operation head are connected to at least one support member whose end portions are respectively pivotally connected to both supports. In a universal parallel ruler connected by a parallel movement device including a link member and configured so that the head side support can float while maintaining almost parallel to the cursor side support, there is a gap between the cursor side support and the link member. To,
The floating holding member is provided with a holding step that supports the link member in a floating state in the upright position, and the floating holding member is retracted in the direction of the cursor side support so as to be able to return when a load of more than a predetermined value is applied. What is claimed is: 1. A floating and holding device for a head portion of a universal parallel ruler, characterized in that it is configured to be able to detach from an engagement step portion and descend.