JPH0243635Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a clamping tool for strongly clamping the workpiece onto a base plate when drilling or cutting the workpiece. .

<Prior Art> When drilling a plate-shaped workpiece by fixing it to the base plate of a drilling machine, for example, there are conventionally known fixing devices such as a shank vise and a drill vise. Also, if the size of the workpiece is too small to use a shank vise, or if the shank vise gets in the way and cannot be used depending on the position of the hole to be drilled in the workpiece, Each time, a suitable jig was made and used to fix the workpiece.

<Problems that the invention seeks to solve> It goes without saying that the complexity, inefficiency, and uneconomical nature of making jigs and tools each time as mentioned above is complicated. On the other hand, there is an increasing number of requests for making large holes (for example, 30φ to 150φ) in workpieces such as plastic plates and steel plates, which cannot be drilled with a drill. Apply horizontal tightening force at the same time as vertical tightening force.
It has become desirable to have a tool that can sufficiently overcome the cutting resistance generated around the periphery of a large hole and that can securely hold the workpiece. However, the conventional shear vise could only achieve vertical tightening, and the drill vise could only achieve horizontal tightening, so there was still room for improvement in this respect.

Although this idea has a relatively simple structure,
The object of this invention is to provide a tightening tool that can substantially apply vertical tightening force and horizontal tightening force at the same time.

<Means for solving the problem> In this invention, screw rods with mounting members screwed together are rotatably installed near both ends of an elongated base, and both mounting members have linear pressing parts. Two spring round bars formed to reach the ends via the curved inclined parts on both sides are installed parallel to each other so that each pressing part is directly below, and the spacing between the above screw rods is such that the workpiece should be fixed. The above purpose is achieved by making the width of the base plate larger than the width of the base plate and allowing the base plate to cooperate with the lower surface of the base plate to press against the workpiece with the pressing part of the two spring round bars. It was designed to do so.

<Example> In FIG. 1 showing an example of this invention, the base 1 is composed of an elongated pipe with a rectangular cross section.
Screw rods 2, 2 are rotatably installed near both ends of the base 1. For this reason, one end of the screw rods 2, 2 is made one step thinner, and if the end is inserted into the mounting hole drilled in the base 1, it can be locked at that step, and the surface of the thinner end is The screws are cut and screwed into nuts 3, 3 inserted into the inside of the base 1, and appropriate locking devices 4, 4 are applied to prevent the screwed nuts 3, 3 from loosening (second (see figure).

Mounting members 5, 5 are screwed into the two screw rods 2, 2, respectively. Two holes 6, 6 are bored in each of the mounting members 5, 5, and both ends of two spring rods 7, 7 are inserted into each hole 6, 6 and fixed with set screws 8, 8. The spring round bars 7, 7 are attached to the mounting members 5, 5 so that the straight pressing part 7a is directly below, and the curved inclined parts 7b, 7b on both sides of the pressing part 7a are
The end portions 7c, 7c are formed to fit into the holes 6, 6 through the holes 6, 6. Pressing parts 7a, 7 of spring round bars 7, 7
A is lowered toward the base 1, and conversely raised away from the base 1 by rotating the screw rods 2, 2. For this purpose, each screw rod 2, 2 has a rotating head on its head. Handles 9, 9 are attached.

Preferably, as shown, two screw rods 2, 2
Elongated holes 10, 10 are bored in the surface of the base 1 between the
Two stoppers 11, 11 on both sides of each long hole 10
The nuts 3a, 3a are provided so as to project inwardly, and the movement range is limited by these two stoppers 11, 11.The nuts 3a, 3a are housed inside the base 1, and if necessary, the nuts 3a, 3a can be removed. It can be erected by screwing tension rods 12, 12 onto 3a.

The usage is as follows.

If the base plate 13 of the machine to which the workpiece is to be fixed has the same thickness at each part, there is no need to use the tension rods 12, 12, but for example, as shown in FIG. If the protruding part of the rib 14 formed on the lower surface hits the attachment part, the tension rods 12, 12 are used to avoid the protruding part of the rib 14.
In other words, in the former case, apply the top surface of the base 1 directly to the bottom surface of the base plate 13, and in the latter case, apply the top surface of the tension rods 12, 12 to the bottom surface of the base plate 13, and then tighten the screw rods 2, 2. Then, the plate-shaped workpiece 15 placed on the upper surface of the base plate 13 is firmly pressed down by the pressing portions 7a, 7a of the two spring round bars 7, 7 (see FIG. 3). At this time, the two spring round bars 7, 7 are in pressure contact with the upper surface of the workpiece 15 in a line contact state, as shown in the figure, and a vertical clamping force is applied in the vertical direction to the two almost parallel line contact points. act. Since the area of the line contact point is small, the vertical tightening force per unit area is strong. When drilling a large hole in the workpiece 15 held down as described above or cutting it with a hacksaw, etc., even if the workpiece 15 tries to shift laterally due to cutting resistance, It cannot be easily moved because it has to move against the pressure applied in two stages by the line contact points arranged in parallel at appropriate intervals. This means that the same effect as applying lateral tightening force is achieved. If the workpiece 15 is a round bar or hexagonal bar, etc., place a known bevel stand (not shown) on the top surface of the base plate 13, receive the workpiece 15 on the bevel stand, and hold the workpiece 15 on the bevel stand. The workpiece 15 is pressed from above using the rods 7, 7. Two screw rods 2, 2
By making the spacing between them larger than the width of the base plate 13, the base 1 can be positioned below the base plate 13, and the two screw rods 2, 2 can be arranged on both sides of the base plate 13. Wear.

<Effects of the invention> As is clear from the above explanation, this invention has the following effects:
Linear pressing part 7 of two parallel spring round bars 7, 7
Since a and 7a also hold down the workpiece 15, it is a relatively simple and convenient tightening tool that can apply vertical and horizontal tightening forces at the same time.
Its practical effects are enormous.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the tightening tool according to this invention, FIG. 2 is a sectional view showing the tightened state, and FIG. 3 is a longitudinal sectional view showing the main part of the same in the tightened state. 1...Base, 2...Screw rod, 5...Mounting member,
7... Spring round bar, 7a... Linear pressing part, 7b
...Curved inclined part, 7c... End part, 13... Base plate,
15...Workpiece.

Claims (1)

[Scope of utility model registration request] Screw rods 2, 2 to which mounting members 5, 5 are screwed are rotatably installed near both ends of the elongated base 1. Two spring round bars 7, 7 formed to reach ends 7c, 7c via inclined parts 7b, 7b are attached parallel to each other so that each pressing part 7a is directly below, and the pair of screw rods 2, 2 is attached. The installation interval is larger than the width of the base plate 13 to which the workpiece 15 is to be fixed, and the base 1 cooperates with the lower surface of the base plate 13 to press the pressing parts 7a, 7a of the two spring round bars 7, 7. A tightening tool that allows pressing against the workpiece 15.