JPH0111369Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a jig that is attached to a magnetic drill to drill holes in shaped steel.

[Conventional technology]

Generally, steel frames are assembled in the construction of buildings and the like, and these steel frames are usually assembled by bolting and joining H-shaped steel. For this reason, bolt holes are pre-drilled in the ends of the H-shaped steel at a factory, the bolt holes are transported to the site and hoisted by a crane, etc., and the shaped steels are joined together at the site by tightening bolts.

As shown in FIG. 8, conventional hole-drilling operations in factories are often carried out manually using a magnetic drill 1.

In this case, first, mark the upper end of the flange 2a of the H-shaped steel 2, and punch holes 4 at the intersections of the marked lines 3. Next, magnetic drill 1
is placed on the upper surface of the flange 2a, and the tip of a centering rod attached to the inside of the cylindrical drill 5 so as to be freely removable and retractable is aligned with the punch hole 4. After this, magnet 6
Turn on the power, fix it to the H-shaped steel 2 by suction, and turn the drill operating lever 7 to drill the bolt hole 8.

Next, de-energize the magnet 6, shift the magnetic drill 1, and align it with the next punch hole 4.
By the same operation, the bolt holes 8 are sequentially drilled.

However, in the conventional method, the marking work and punch hole marking work were time-consuming, and the workability was extremely poor, especially when hundreds of holes were to be punched at approximately the same position. Further, when drilling holes with the drill 5, unless the tip of the centering rod is accurately positioned in the center of the punch hole, the drilling position will shift and there is a problem that the holes cannot be drilled accurately.

In addition, unlike general machining, using a drilling jig with multiple bosses attached to a steel plate in correspondence with the drilling positions is difficult with the mobile magnetic drill 1, which is fixed by the attraction force of a magnet. The tool was floating and the magnetic drill 1 could not be securely fixed to the flange 2a, so it could not be used, and the drilling position was determined by marking as described above.

[Problem that the invention attempts to solve]

The present invention has been developed in view of the above, and is a method for marking and punching holes by attaching a jig integrally to the magnetic drill body when drilling steel shapes in which the bolt hole drilling positions are almost fixed. The present invention provides a drilling jig for shaped steel that eliminates the need for drilling and greatly improves drilling accuracy and workability.

[Means for solving problems]

The present invention will be explained in detail below with reference to the drawings.

1 to 5 show a drilling jig 9 for shaped steel according to the present invention. A bar 11, a presser bar 12 made of an angle material that contacts the opposite side of the flange 2a, and a connecting bar 13 connected to the ends of the guide bar 11 and the presser bar 12 orthogonally thereto.
Further, a connecting bar 15 having a presser lever 14 rotatably attached thereto is connected to the front middle of the guide bar 11 and the presser bar 12. In this case, the distance between the guide bar 11 and the presser bar 12 is formed to be slightly larger than the width of the flange 2a.

The connecting bar 13, as shown in FIG. A pin 18 is attached to the upper part of the support rod 17, and this pin 18 is inserted into the pin hole 16 of the jig frame 10, and the magnetic drill 1 rotates about the pin 18 as a rotation fulcrum. are connected like this.

As shown in FIG. 2, the magnetic drill 1 has a magnet 6 attached to the bottom of a main body 19, a motor 20 fixed vertically to the front of the upper part of the main body 19, and a drill 5 at the tip of the motor 20. connected. Furthermore, at the rear of the main body 19, there is a support rod 21 that descends when the magnet 6 is excited.
A moving support rod 17 is provided to lift the magnet 6 side when moving the magnetic drill 1 and to support it so that it slides.

The above-mentioned configuration is the same as the commercially available magnetic drill 1, but the present invention differs in that a pin 18 is attached to the top of the moving support rod 17, and a shaped steel drilling jig 9 is connected thereto. It is.

Further, at approximately the center of the upper surface of the guide bar 11 and the presser bar 12 of the jig frame 10, as shown in FIGS. Positioning parts 22A and 22B are fixed. These positioning parts 22A, 22B are connected to brackets 23a, 2
A bolt 24 is attached to 3b, and the position of the bolt 24 is adjusted so that the tip thereof comes into contact with the side surface of the block-shaped magnet 6, thereby positioning the drill 5. Further, the upper end of the bracket 23b of the positioning part 22B attached to the guide bar 11 is bent inward to form a locking part 25, and when the magnetic drill 1 is moved, the block-shaped magnet 6 is attached to the locking part. 25 to horizontally support the drilling jig 9 and allow it to move together.

Further, a scale graduation 26 is formed on the upper surface of the guide bar 11 in the longitudinal direction thereof, so as to determine the hole drilling position.

The presser bar 12 also has a cam 27 on its side.
A fixing lever 28 formed of is rotatably attached.

[Effect]

Next, a method of using the hole-drilling jig 9 having the above structure will be explained.

Place the magnetic drill 1 with the drilling jig 9 connected with the pin 18 on the flange 2a of the H-shaped steel 2, and press the flange 2a between the guide bar 11 and the holding bar 12.
Set it so that both sides are sandwiched. Next, the scale graduation 26 is aligned with the tip of the flange 2a, and a cam-type fixing lever 28 is attached to the presser bar 12.
Rotate and tighten to fix the hole-drilling jig 9 to the H-shaped steel 2. Next, the pin 18 connected to the drilling jig 9
The magnetic drill 1 is rotated using the rotation fulcrum, and as shown in FIG.
comes into contact with the positioning portion 22A on the guide bar 11 side.

After that, when the magnet operation lever (not shown) is rotated, the block-shaped magnet 6 is excited and fixed to the flange 2a, and the motor 2
0 is turned on and the drill 5 rotates. Next, when the drill operating lever 7 is rotated to lower the drill 5, the bolt hole 8 is drilled at a predetermined position of the flange 2a by the drill 5.

Next, after raising the drill 5 and canceling the excitation of the magnet 6, the magnetic drill 1 is rotated as shown by the imaginary line in FIG. 4 using the pin 18 as a rotation fulcrum.
The side surface of the block-shaped magnet 6 is pressed against the positioning portion 22B on the guide bar 11 side using the holding lever 14 so as to come into contact with it. Thereafter, when the magnet 6 is similarly excited and fixed to the flange 2a and the drill 5 is rotated, bolt holes 8 are drilled at predetermined positions in the flange 2a.

Next, the excitation of the magnet 6 is released, the magnet 6 side is lifted, and the magnetic drill 1 is moved together with the drilling jig 9 while sliding the moving support rod 17, and the tip of the flange 2a is moved to the next position. Align with the scale graduation 26 corresponding to the hole drilling position in the second row,
Thereafter, the bolt holes 8 are sequentially opened by the same operation.

Therefore, the bolt holes 8 are placed in the scale graduation 26 in advance.
Simply move the drilling jig 1 according to the scale, rotate the magnetic drill 1 from side to side using the pin 18 as a rotational fulcrum, and drill the bolt holes symmetrically at the predetermined position. 8 can be drilled.

Furthermore, when removing the magnetic drill 1 from the H-shaped steel 2, the block-shaped magnet 6 is locked to the locking part 25 of the bracket 23a.
The drilling jig 9 can be moved together with the magnetic drill 1 while being held horizontally.

FIG. 6 shows another embodiment of the present invention, in which the guide bar 11 and the presser bar 12 are bent into an L shape.
A long hole 29 is opened in this bent portion, and a bolt 24 is passed through the hole to be movably fixed to the connecting bar 13. The distance between the guide bar 11 and the holding bar 12 can be adjusted according to the width of the flange 2a of the H-shaped steel 2, and one jig 9 can be used for H-shaped steels 2 of different shapes.

FIG. 7 shows a different scale section, in which a rotating scale section 30 is provided on the upper surface of the guide bar 11 instead of a scale. This is the rotating shaft 31
A plurality of claws 32 are provided at intervals corresponding to the drilling positions.
For example, when drilling the first bolt hole 8, the first pawl 32a is placed on the top surface of the flange 2a, and the second pawl 32b is placed on the tip of the flange 2a. Drilling jig 9 so that they are in contact with each other
, and open the first row of bolt holes 8, 8. Next, the rotating shaft 31 is rotated, the second claw 32b is placed on the flange 2a, and the third claw 32C is positioned so as to come into contact with the tip of the flange 2a. 8 can be easily positioned.

Note that in the above embodiment, the positioning parts 22A, 22
B is formed to be adjustable using the brackets 23a, 23b and the bolt 24, but it may be of a fixed type if the hole position is determined. Also presser bar 1
Instead of the cam-type fixing lever 28 attached to the second side, a wedge may be driven in to fix the hole-drilling jig 9 and the flange 2a.

In the above explanation, the case of drilling holes in H-shaped steel 2 has been described, but the jig of the present invention can be widely used for drilling holes in L-shaped steel, shaped steel, or square pipes.

[Effect of idea]

As explained above, according to the drilling jig for shaped steel according to the present invention, by integrally connecting the magnetic drill to the jig with a pin so as to be rotatable, marking and punching holes can be done easily. This eliminates the need for a bolt hole, improves work efficiency, allows bolt holes to be drilled at symmetrical predetermined positions with high accuracy, and also has remarkable effects such as being able to be easily attached to a commercially available magnetic drill.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the drilling jig for shaped steel according to the present invention, Fig. 2 is a perspective view showing the state of use, and Fig. 3 is a side view showing the connecting part between the drilling jig and the magnetic drill. FIG. 4 is an explanatory diagram showing the state of use in a plan view, FIG. 5 is a front view of main parts showing the state during transportation, FIG. FIG. 7 is a perspective view showing the rotary scale section, and FIG. 8 is a perspective view showing a conventional hole drilling state. 1... Magnetic drill, 2... H-shaped steel, 2a... Flange, 3... Marking line, 5... Drill, 6... Magnet, 8... Bolt hole, 9... Drilling jig, 10... Jig frame, 11... Guide bar , 12...presser bar,
13... Connection bar, 14... Presser lever, 16... Pin hole, 17... Support rod for movement, 18... Pin, 19... Main body, 20... Motor, 22A, 22B... Positioning part, 26... Scale graduation, 28... Fixed lever for
29...Long hole, 30...Rotating scale part.

Claims (1)

[Claims for Utility Model Registration] (1) A guide bar that abuts on one side along the longitudinal direction of the upper surface of the steel shape to be drilled, a presser bar that abuts on the opposite side, and a connection between these two bars. A jig frame configured in a frame shape with a connecting bar is provided with a pin hole rotatably connected to a moving support rod of a magnetic drill in the center of the connecting bar, and a pin hole is provided in the center of the connecting bar, and the guide bar and the presser bar are A drilling jig for shaped steel, characterized in that positioning parts are provided on the sides of the magnetic drill, and a scale part is provided on the upper surface of the guide bar. (2) Utility model registration claim 1, characterized in that the jig frame is attached to the connecting bar so that the distance between the guide bar and the presser bar can be adjusted.
Drilling jig for shaped steel as described in section.