JPH03314Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is particularly useful in ensuring the alignment accuracy of members to obtain good welding quality when forming a welded structure consisting of a plurality of members. This invention relates to improvements in clamping jigs that contribute effectively.

(Prior art) Generally, side members (rails) of automobiles (mainly trucks) have a ladder-shaped frame structure.
has a structure as shown in FIGS. 1 and 2. That is, in these figures, what is indicated by reference numeral 1 is the side member, and this side member 1
The inner channel 3, which is narrower than the outer channel 2 and also has a U-shaped cross section, is fitted inside the outer channel 2 which has a U-shaped cross section, facing each other,
A welded structure is formed by welding the fitted portions with a welding machine (torch) 4 such as an arc welding machine. Note that the part indicated by the symbol W is the welded part.

By the way, since the side member 1 has an extremely long overall length and partially has a curved shape as shown in FIG. 1, it is difficult to match the shapes of the outer channel 2 and the inner channel 3 to each other with high precision. I'm having sex. Conventionally, in order to obtain good welding quality by ensuring alignment accuracy between the outer channel 2 and the inner channel 3, a clamping jig, indicated by reference numeral 5 in the figure, has been installed over the entire length of both sides of the assembly body of the side member 1 before welding. A plurality of channels are disposed across each other, and welding is performed with the space between both channels 2 and 3 eliminated by the clamping force obtained from a driving source such as a cylinder.

For example, as shown in FIG. 3, this conventional clamp jig 5 has a main body 6, three clamp pieces 7,
7', 7'' are each fixed by two hexagon socket head bolts 8 and arranged in parallel, and between each clamp piece 7, 7', 7'' and the main body 6, there is a shim 9, respectively. is interposed, and the position is adjusted in the longitudinal direction by the shim 9, and a pin 10 inserted into the main body 6 and the clamp pieces 7, 7', 7'' is inserted between the bolts 8, 8. The pin 10 is used to position the main body 6 in the left-right direction.

However, in the case of the clamp jig 5 having the above structure, the contact portions 7A, 7'A, 7''A of the clamp pieces 7, 7', 7'' to the clamped body follow the shape of the clamped body. In order to achieve a reliable clamping condition, the tips of the clamp pieces 7, 7', and 7'' are ground with a sander, etc. Since the shape is fixed to a specific part of a specific clamped body, there is no applicability to other clamped bodies having different shapes, that is, there is no versatility. 7' and 7'' are no longer compatible. Furthermore, as mentioned above, since the cutting process is required, a large number of man-hours are required for manufacturing, and improvements in these points are required.

(Purpose of the invention) The present invention was made in view of the above points, and its purpose is to obtain versatility and compatibility, reduce manufacturing man-hours, and An object of the present invention is to provide a clamping jig that can realize a reliable clamping state and greatly contributes to improving productivity.

(Structure of the invention) In order to achieve the above object, the present invention has the following structure.

That is, a plurality of clamp pieces whose abutting portions to the object to be clamped are shaped so as not to be affected by the shape of the object to be clamped are arranged side by side on the main body so as to be movable back and forth, and each of the plurality of clamp pieces A clamping jig characterized in that a collar member is removably interposed in a retracted region formed with the main body.

(Embodiments) Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

In FIGS. 4 to 6, 11 is the clamp jig of the present invention, and 12 is its main body. The main body 12 has a bottom wall portion 12A, a back wall portion 12B, and a side wall portion 12C, and a box-shaped storage portion 12D is formed by these wall portions 12A, 12B, and 12C. In this box-shaped storage part 12D, six clamp pieces 13 are arranged side by side in the same direction and movable back and forth, from one side wall part 12C to the other side wall part 12C.
It is kept tightly contained. This clamp piece 13
has a shape in which the tip thereof is the abutting part 13A against the clamped body, and the contact state of this abutting part 13A is not affected by the shape of the clamped body, that is,
Here, the tip side is formed into a semi-cylindrical shape as shown in Fig. 7, and the contact state with the clamped body is a line contact, so that any shaped part of the clamped body can be in a contact state. is said to be unaffected. Further, a U-shaped groove 13B is formed in the middle portion of the clamp piece 13, and a U-shaped groove 13C, which is narrower than the U-shaped groove 13B, is formed further toward the rear end of this. There is.

A clamp piece 1 is mounted on the back wall portion 12B of the main body 12.
A bolt hole 12E is formed corresponding to 3.
A hexagon socket bolt 14 is threaded through this bolt hole 12E. U-shaped groove 1 of clamp piece 13
3B accommodates the head of this hexagon socket head bolt 14, and the neck of the hexagon socket head bolt 14 is inserted into the U-shaped groove 13C. Hexagon socket head bolt 1
A nut 15 is attached to the tail end of 4, and when the nut 15 is operated, the clamp piece 13 is slid on the bottom wall 12A of the main body 12 and moved back and forth, and its position in the front and back direction can be adjusted. It's becoming more common. The hexagon socket head bolt 14 has a square hole 14A at its most proximal end, and the hexagon socket head bolt 14 may be rotated using this square hole 14A.

Back wall portion 12 of main body 12 of each clamp piece 13
A collar 16 is interposed in the retreat area formed with B. This collar 16 is shaped as shown in FIG. 8 and has a U-shaped groove 16A that allows the body of the hexagon socket head bolt 14 to enter.
It is used for positioning the clamp piece 13 in the front-rear direction, and various widths are available. That is, the clamp piece 13 is first fitted with a bolt 14 and a nut 1 according to the shape of the object to be clamped.
5, the position in the front and back direction is adjusted, and then a collar 16 is inserted between the rear end and the main body 12B.
are fitted, and finally bolt 14 and nut 1
5 is positioned and fixed to the main body 12.

17 is a cover plate (not shown in FIG. 4), and this cover plate 17 is attached to the main body 12 by bolts 18.
The clamp piece 13 is fixed to the clamp piece 13 and is covered with the clamp piece 13.
This is to prevent the clamp jig 11 from wobbling when in use.

According to the clamp jig 11 having the above configuration, the initial objective of the present invention can be achieved, and the following effects can also be achieved. That is, clamp piece 13
Since the state of contact with the object to be clamped is a line contact, the clamping force can be concentrated on the contact portion 13A, so the driving force can be reduced accordingly, and the driving force can be maintained as before. By using this, it is possible to achieve an even more secure clamping condition.

Furthermore, when clamping a planar portion of a clamped object with the clamp jig 11, it is not necessary to use all the clamp pieces 13, and for example, an average clamping force is applied to the clamped object. All you have to do is give it, so you can use every other one.

FIGS. 9 to 12 show modified examples of the clamp pieces according to the present invention. First, the clamp pieces 19 and 20 shown in FIGS. It is meant to be. Moreover, the clamp piece 21 shown in FIG.
is a line contact like the clamp piece 13, but its tip is shaped like a hill, so
It is suitable for application to valley portions in portions of the object to be clamped that have a relatively steeply sloped surface shape. The clamping piece 22 shown in FIG. 12 has a hemispherical tip so that it makes a point contact with the object to be clamped. There are various other shapes that can be considered, but the main points are:
It is preferable that the abutting state of the abutting portion is not influenced by the shape of the object to be clamped to be clamped.

(Effects of the Invention) As is clear from what has been described above, according to the present invention, the clamp piece is formed in such a shape that the contact state of its abutting portion is not affected by the shape of the object to be clamped. Since it can be made to conform to the object to be clamped by simply attaching and detaching the collar, it has applicability to various shapes, and has the effect of being able to obtain versatility and compatibility. Further, there is no need to cut the clamp pieces, and clamp pieces with the same shape can be used, which also has the effect of reducing the number of manufacturing steps. Furthermore, since an average clamping force can be efficiently applied to each part of the clamped body, a reliable clamping state can be achieved. As described above, the clamping jig of the present invention has various effects and greatly contributes to improving productivity.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams used to describe the necessity of a clamp jig, Figure 3 is a partially sectional plan view showing the structure of a conventional clamp jig, and Figure 4 is a partial cross-sectional plan view showing the structure of a conventional clamp jig.
The figure is a sectional plan view of the main part showing the structure of the clamp jig of the present invention, FIG. 5 is a sectional side view of the main part, FIG. 6 is a partial rear view, and FIG. 8 is a perspective view of the collar of the clamp jig shown in FIGS. 4 to 6, and FIGS. 9 to 12 are variations of the clamp piece according to the present invention. FIG. 3 is a perspective view showing an example. 1...Side member (clamped body), 11...
... Clamp jig, 12 ... Main body, 13 ... Clamp piece, 13A ... Contact part, 16 ... Collar, 1
9, 20, 21, 22... Clamp top (modified example).

Claims (1)

[Scope of utility model registration request] A plurality of clamp pieces whose abutting portions to the clamped body have a shape that is not affected by the shape of the clamped body are arranged side by side on the main body so as to be movable back and forth, and each of the plurality of clamp pieces A clamp jig characterized in that a collar member is removably interposed in a retreating region formed with the main body.