JPH0634050Y2 - Circle compass for steel plate - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a circular compass for making a circular hole in a steel plate,
In particular, the present invention relates to a circular compass for making circular holes for electric wiring, gas piping, water-conducting piping, etc. after assembling a floor steel plate of a steel frame building.

[Conventional technology]

A conventional circular compass of this type is shown in FIGS. 3 and 4. FIG. 3 shows the upper surface and FIG. 4 shows the front surface. A shaft 25 is erected on a cylindrical base 1 having a ferrite magnet on the lower bottom thereof, and a rotating arm 26 is rotatably connected to the shaft 25. A torch support arm 27 is movably supported at a free end of the rotary arm 26 in a direction (tangential direction of a rotation circle locus) orthogonal to the radius of rotation of the rotary arm 26, and is fixed by tightening a lock bolt 28. ing.

The support leg 16 is fixed to one end of the torch support arm 27, and the roller 17 is attached to the support leg 16. Support leg
A plasma torch 15 is provided between the rotary arm 26 and the rotary arm 26, and is supported below by a support ring 29 supported by a torch support arm 17. That is, the holder 30 fixed to the torch 15
The support ring 29 is rotatably supported around the center of the support ring 29.

A pin 21 projects at the center position of the lower base of the base. When a round hole (the circumference is WL) is made in the steel plate 1, the pin 21 is positioned at the center of the base plate 2 so that the base 2 is on the steel plate 1. Installed on the plasma torch 15, and the torch centered around the shaft 25
Rotate 15 If the torch 15 is completely rotated once about the shaft 25, the round hole WL is opened, and the steel disc generated by this is dropped below the steel plate 1, and the base 2 magnetizes the steel plate (steel disc). Since it is adsorbed, the base 2 also drops below the steel plate 1. This fall can cause various problems.
For example, if the steel plate 1 is a floor steel plate after building assembly, there is a problem of hitting a worker or equipment below. If there is, for example, a ceiling plate below the floor steel plate, the dropped steel circular plate is used as a round hole WL. It's hard to pull from.

[Issues where the device is about to be revised]

Therefore, in the conventional art, the whole circumference of the circumference WL is cut at a few places without cutting at once, and the base 2 is removed from the steel plate 1 and moved to another place, and the torch 15 is pulled out from the ring 29 and left. The cut parts are sequentially cut, the circular steel plate is raised upward while leaving only one point, supported so as not to drop downward, and the last part is cut.

This kind of circular hole drilling is roughly performed by making a circular hole leaving a few points, cutting an uncut part leaving one point, supporting the circular steel plate to raise and prevent falling, and cutting the last point left. It requires three steps of work, and it has a large number of work points and low work efficiency.

The present invention aims to increase the efficiency of circular hole drilling work.

[Means for Solving the Problems]

The circular compass for steel plate of the present invention is a steel plate to be processed (1)
A central base (2) which is adsorbed on the central base (2);
A horizontal arm (8,9) rotatable about the longitudinal center axis of the shaft body (5); a plasma torch (15) supported downward by the horizontal arm (8,9); and a shaft body (5). A distance from the shaft body (5) that is longer than the distance between the plasma torch (15) and the machining point of the plasma torch (15), and is distributed in the circumferential direction around the shaft body (5) and below the center base (2). Facing the steel plate (1) of
3 or more rollers (17 ₁ mounted on the horizontal arm (8, 9)
~ 17 ₃ );

The symbols in parentheses indicate the corresponding elements in the embodiments shown in the drawings and described later.

[Action]

When the torch (15) is completely rotated once around the shaft body (5) to completely open a round hole at once, the circular steel plate produced by this hole tries to drop together with the center base, but the horizontal arm ( three or more rollers 8, 9) (17 ₁ to 17 ₃₎ is mounted, they are, than the distance of the shaft body (5) and the processing point of the plasma torch (15), from the shaft (5) At a long distance, and distributed in the circumferential direction around the shaft (5),
Because faces the central base (2) under the steel plate (1), these rollers (17 ₁ to 17 ₃₎ abuts the surface of the steel sheet 1, the central base via a horizontal arm (8, 9) Prevent the drop of (2). Since the central base (2) adsorbs the circular steel plate, the circular steel plate also does not fall. By lifting the central base (2), the circular steel plate comes out upward from the round hole of the steel plate (1).

Thus, according to the present invention, when the round hole is completely opened,
Central base (2) and steel disc automatically rollers (17 ₁ to 1
7 ₃ ) and the horizontal arms (8, 9) are supported and do not fall, so that the torch (15) can perform a complete round hole at a stretch. Therefore, the circular hole drilling work efficiency is improved.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

FIG. 1 shows a plan view of an embodiment of the present invention, and FIG. 2 shows a longitudinal section. A ring-shaped groove centered on the center of the cylinder is engraved on the lower surface of the center base 2 which is a cylindrical iron block, and the ring-shaped ferrite permanent magnet 3 is fitted into the center groove and is bonded to the center base with an adhesive. It is joined to the base 2. Central base 2
A ball plunger 18 is screwed into the center of the bottom surface of the. A compression coil spring is housed inside the ball plunger 18. The plunger pin 18 ₁ is vertically movable and is constantly pushed downward by the compression coil spring. The plunger pin 18 ₁ is located on the central axis of the central base 2.

A bearing support ring 4 is placed on the upper surface of the center base 2, and a threaded hole is formed at the center of the ring 4 and the center base 2, into which a shaft body 5 having an inner ring of a bearing 6 is screwed. Has been. Attach the nut 7 to the screw on the top of the shaft 5.
Are screwed together, and the nut 7 fastens the inner ring of the bearing 6 and the ring 4 to the center base 2. As a result, the central base 2, the ring 4, the inner ring of the bearing 6, the nut 7 and the shaft 5 are integrated. The outer ring of the bearing 6 is fixed to the first horizontal arm 9 by press fitting.
As a result, the first horizontal arm 9 is rotatable with respect to the shaft body 5 and is supported by the shaft body 5 via the bearing 6.

A ring 10 for pressing the outer ring of the bearing 6 is mounted on the first horizontal arm 9, and a bolt 11 that has passed through the hole of the ring 10
The ₁ to 11 _3, the first horizontal arm 9, a second horizontal arm 8
Is stuck. Second horizontal arm 8, the cradle 12 width is wide substantially has an opening 8 ₀ rectangle, which the flanged cylindrical body
Has penetrated. A screw penetrating the flange of the pedestal 12 is screwed into a screw hole of the second horizontal arm 8, so that the pedestal 12 is fixed to the second horizontal arm 8.

A rotary sleeve 13 with a flange is fitted in the pedestal 12 so as to be rotatable and movable upward, and a plasma torch 15 is fixed to the rotary sleeve 13 via an insulating cylinder 14.

The first horizontal arms 9 are arranged in parallel with each other about the shaft body 5 in the horizontal direction.
It has support arms 9 _{1 to} 9 ₃ extending radially at intervals of 0 degree. Support legs 16 _{1 to} 16 ₃ are fixed to the support arms 9 _{1 to} 9 ₃ with screws, and rollers 17 _{1 to} 17 ₃ are attached to the lower ends of the support legs 16 _{1 to} 16 ₃ .

When making a round hole with a circumference of WL (Fig. 1) on steel plate 1,
Circle the distance between the center axis of the shaft 5 and the nozzle center of the torch 15.
Set to the radius of WL. This is done by removing the screws from the pedestal 12
12 is moved toward or away from the shaft body 5 (arrow A) so that the distance between the central axis of the shaft body 5 and the nozzle center of the torch 15 is adjusted to the radius of the circumference WL, and the pedestal 12 is moved with a screw. 2 Stick to the horizontal arm 8. The rollers 16 _{1 to} 16 ₃ are
Make sure that the distance is longer than the radius of the circle WL. If short, the legs 16 ₁ to 16 ₃ Remove the set screw of the legs 16 ₁ to 16 ₃
The removed from the support arm 91 _to 93 ₃ is shifted in their distal direction (arrow B), and re-fixed with a set screw.

Next, the plunger pin 18 ₁ on the bottom of the center base 2 is positioned at the center of the circumference WL, and the center base 2 is placed on the steel plate 1. As a result, the center base 2 is attached to the steel plate 1. Then, the plasma torch 15 is activated and the torch 15 is rotated once around the shaft body 5. This opens a circular hole. The circular steel plate produced by this perforation and the central base 2 that has adsorbed the circular steel plate try to move (fall) downward, but at this time, the three rollers 17 ₁ to 1
7 ₃ hits the surface of the steel plate 1, and the center base 2 torch 15 is supported by the rollers 17 _{1 to} 17 ₃ via the first horizontal arm 9, so that the circular steel plate attracted to the center base 2 is Do not fall.
By lifting the central base 2 (entire cutter) by holding the first horizontal arm 9 and the second horizontal arm 8 and moving it to another place, only the round hole remains in the steel plate 1, and the circular steel plate generated thereby is the central base. It means that it has been moved to another place together with the stand 2.

In this way, the torch 15 can be rotated completely once at a time to efficiently make a circular hole, and when this is completed,
Since the circular steel plate is automatically removed at the same time as the cutting device is removed, the circular hole drilling work becomes extremely simple and efficient.

[Effect of device]

As described above, according to the present invention, the circular hole drilling work is extremely simple and efficient.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a plan view showing one of the conventional circular compasses. FIG. 4 is a side view of the circular compass shown in FIG. 1: Steel plate (steel plate to be processed) 2: Center base (center base) 3: Ferrite permanent magnet, 4: Ring 5: Shaft (shaft), 6: Bearing 7: Nut, 8: Second horizontal arm 8 ₀ : Opening, 9: 1st horizontal arm (8, 9: Horizontal arm) 9 _{1 to} 9 ₃ : Support arm, 10: Presser ring 11 _{1 to} 11 ₃ : Bolt, 12: Cradle 13: Rotating sleeve, 14 : Insulation cylinder 15: Plasma torch (Plasma torch) 16 _{1 to} 16 ₃ : Support leg, 17 _{1 to} 17 ₃ : Roller 18: Ball plunger, 18 ₁ : Plunger pin 25: Shaft body, 26: Rotating arm 27 : Torch support arm, 28: Lock bolt 29: Support ring, 30: Holder

Claims (1)

[Scope of utility model registration request] 1. A center base adsorbed to a steel plate to be machined; a shaft erected on the center base with its longitudinal center axis aligned with its vertical center axis; rotating about the longitudinal center axis of the shaft body. A freely movable horizontal arm; a plasma torch supported downward by the horizontal arm; and a center of the shaft body at a distance longer than the distance between the shaft body and a processing point of the plasma torch. A circular compass for a steel plate, comprising: three or more rollers mounted on the horizontal arm, which are distributed in the circumferential direction and face the steel plate below the center base.