JPS6035535Y2 - drilling jig - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drilling jig, and in particular to a drilling jig that prevents the production of defective products by preventing drilling if a dowel pin is forgotten to be inserted.

Conventionally, in drilling jigs in which the jig and workpiece are positioned using seven pins, the fitting clearance between the dowel pin and the dowel pin insertion hole of the jig is extremely small, so the dowel pin cannot be completely inserted into the workpiece. The dowel pin will be fixed upright on the drilling jig even if you do not insert it into the hole, and it will feel as if it has been completely inserted. Since the holes do not match the regular drilling positions of the machine, holes are drilled in unexpected positions, resulting in defective workpieces.

Furthermore, even if the dowel pin was forgotten to be completely inserted, it was possible to drill the hole in the same way, resulting in defective products.

The present invention was made in order to eliminate the drawbacks of the above-mentioned prior art, and its purpose is to provide a dowel pin in a drilling jig in which the jig and the workpiece are positioned by a dowel pin. If the drill is not completely inserted into the workpiece, the drill will not be guided by the guide bush of the jig and drilling will not be possible, and this will also prevent the production of defective products.

Another purpose is to simplify the structure and make it possible to drill a large number of holes by making it impossible to perform at least the first step of drilling unless the dowel pin is completely inserted when drilling multiple holes using the same jig. This is to ensure that the processing is carried out reliably.

In short, the present invention includes a jig provided with a guide bush for drilling and a dowel pin insertion hole, and a workpiece that is positioned by the dowel pin, the dowel pin having the same diameter as the dowel pin insertion hole. A small diameter part and a large diameter part having a larger diameter than the small diameter part are formed, and a baffle plate is movably disposed on the top surface of the jig, and the baffle plate has a part with the same diameter as the large diameter part of the knock pin. The present invention is characterized by being provided with a dowel pin insertion hole and a guide bush having the same diameter as the hole-drilling guide bush of the jig, which communicates with the hole-drilling guide bush of the jig when the dowel pin is inserted.

The present invention will be explained below based on embodiments shown in the drawings.

1 to 3, a drilling jig 1 is configured such that the jig and a workpiece 2 are positioned by dowel pins 3, and a baffle plate 4 is arranged on the upper surface 1a of the jig 1. The corner portion 4a of the baffle plate is pivotally connected to the jig 1 by a pin 5, and is movable with respect to the jig 1. A tension spring 8 is stretched between the plate 4 and a pin 7, and the spring always urges the baffle plate 4 in the direction of arrow A.

In addition, the baffle plate 4 has at least one guide bushing 4b and an insertion hole 4c for the dowel pin 3, which are aligned and communicated with the drilling guide bush 1b of the jig 1 only when the dowel pin 3 is completely inserted. We are prepared.

The insertion hole 4c of the knock pin 3 is formed to have a large diameter, and its diameter is made equal to the large diameter portion 3a of the knock pin 3, and the diameter of the small diameter portion 3b of the knock pin 3 is equal to the diameter of the 7 screw pin insertion hole 1c of the jig 1.
and the dowel pin insertion hole 2c of the workpiece 2.

Further, a handle 9 is fixed to the baffle plate 4 for pulling the baffle plate toward the user against the spring 8.

The dowel pin 3 has a small diameter part 3b, a large diameter part 3a finished with precision, and a knurled grip part 3C.
It is desirable that the length of the small diameter portion 3b is equal to the total thickness of the jig 1 and the workpiece 2, and the length of the large diameter portion 3a is set equal to the thickness of the baffle plate 4.

The present invention is constructed as described above, and its operation will be explained below.

Before drilling a hole in the workpiece 2,
If the baffle plate 4 of the jig 1 is not moved and the dowel pin insertion hole 4c is placed under the jig 1 as shown by the imaginary line in FIG. 1
The center of the guide bushing 4b has shifted from the center of the guide bushing 1b.

Therefore, even if you try to insert the dowel pin 3, the large diameter part 3a
Even if you forget to insert the dowel pin 3 and insert the drill 10 into the guide bush 4b of the baffle plate 4, the tip 10a of the drill 10 will still be able to enter the guide bush lb of the jig 1. It comes into contact with the upper surface 1a of the hardened jig 1 and cannot be lowered any further.

Therefore, it is possible to realize that the dowel pin 3 has been forgotten to be inserted, and to prevent the workpiece 2 from being drilled at an unexpected position and resulting in a defective product.

Then, when you grab the handle 9 of the baffle plate 4 and pull it toward you, the baffle plate 4 rotates in the direction of arrow B against the spring 8, and the first
As shown by solid lines in the figure and FIG. 2, the guide bushes 4b and 1b are aligned, and the dowel pin insertion holes 4c, lc, and 2c are aligned coaxially, as shown in FIG. Align.

As a result, the knock pin 3 is completely inserted until the large diameter portion 3a is inserted into the knock pin insertion hole 4c.

Then, move the drill 10 to the guide bush 4b. Then, it is introduced into the guide bush 1b, and the workpiece 2 can be properly drilled.

If there are multiple holes to be machined in the workpiece 2, the baffle plate 4 described above may be used for the holes to be machined in the first step, but no consideration is required in the second and subsequent steps due to the positioning action of the dowel pin 3. The desired hole drilling process can be performed one after another without any problems.

Since the present invention is constructed and operates as described above, in a drilling jig in which the jig and the workpiece are positioned by dowel pins, if the dowel pin is not completely inserted into the workpiece, Since the drill is not guided by the guide bush of the jig, it is possible to prevent drilling, which has the effect of preventing the production of defective products.

In addition, when drilling multiple holes with the same jig, at least the first step of drilling cannot be completed unless the dowel pin is completely inserted, so the structure of the jig does not become complicated and requires multiple holes. This provides the effect of ensuring that the hole drilling process is performed reliably.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a perspective view of a dowel pin of a hole-drilling jig, FIG. 2 is a plan view of the hole-drilling jig, and FIG.
The figure is a longitudinal cross-sectional view taken along the line ■-■ in FIG. 2, with a dowel pin and a drill added. 1 is a drilling jig, 1a is a top surface, 1b is a guide bush for drilling, 2 is a workpiece, 3 is a dowel pin, 3a is a large diameter part, 3b is a small diameter part, 4 is a baffle plate, 4b is a guide bush, 4C is a dowel pin insertion hole.

Claims (1)

[Scope of utility model registration request] A jig provided with a guide bush for drilling and a dowel pin insertion hole, and a workpiece positioned by the dowel pin, wherein the dowel pin has a small diameter portion having the same diameter as the dowel pin insertion hole. A large diameter portion having a larger diameter than the small diameter portion is formed, a baffle plate is movably disposed on the upper surface of the jig, and the baffle plate has a dowel pin insertion hole having the same diameter as the large diameter portion of the dowel pin; A drilling jig characterized in that a guide bushing having the same diameter as the drilling guide bushing of the jig is provided, which communicates with the drilling guide bushing of the jig when the dowel pin is inserted.