JPS63207424A - Piercing tool - Google Patents

Abstract

PURPOSE:To eliminate the danger of a chip and the trouble of a burr and to orthogonally fit a fitting by forming a shearing part in noncircular shape, making the projection distance of a tip part and rear end part larger than the diameter of a connection fitting and making an intermediate part the same as the fitting diameter. CONSTITUTION:The shearing part 9 of a piercing tool has a shearing end face 10 inclining in the axial line and the projection distance of the tip part 11a and rear end part 11c of the outer peripheral edge thereof is made larger than the outer diameter of a buried connection fitting and an intermediate part is made the same as the diameter of the connection fitting. A bending plate, etc., is subjected to piercing via a piston member 6 by the explosive gas pressure of a gun powder, etc., at this shearing part. In this case, since the chip remains by sticking at the lower part of the edge part of the rear end part 11c there is no danger of its scattering in the air and the work can be effected safely. At the time of. fitting the buried connection fitting as well, a cutting part is bent to one side part, so no burr is caused on the whole peripheral side of a hole and the connection fitting can orthogonally be fitted to the bending plate, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tool for drilling holes in metal plates, and is mainly used to drill holes for installing embedded connectors of heavy piping fittings in buildings. Used in cases.

When constructing a building, ventilation ducts, electricity, and gas are installed between the floors of the upper floors and the ceilings of the lower floors.

It is widely practiced to install piping such as water supply.

These pipes are suspended by hanging fittings, and the hanging fittings are attached to embedded connectors fitted into holes provided in folded plates or deck plates that are constituent members of the floor. When this work is completed, concrete is poured on top of the folded plates and deck plates to construct the upper floor and at the same time fix the embedded connectors.

Holes for fitting embedded connectors are drilled with an electric drill, but the moment the drill penetrates the folded plate or deck plate, the resistance suddenly decreases, making it dangerous as the worker's posture tends to collapse. Therefore, Japanese Utility Model Application Publication No. 58-47500 discloses that a piston member is driven using explosive gas pressure of gunpowder, and a folded deck plate is punched out using a shearing blade at the tip of the piston member. According to this method.

It is possible to work safely even in places with poor scaffolding without the worker's posture collapsing.

Problems to be Solved by the Invention When holes are punched out in a metal plate such as a folded plate or deck plate by the shearing action of the piston member, if the chips separate from the metal plate and fly through the air or fall, they may cause damage to other workers. There is also a risk of causing damage to the hole, and the formation of cracks around the hole may interfere with the installation of the embedded connector.

FIG. 13 shows a state in which a hole 223 is formed around a hole 220 formed in the metal plate 21 by the shearing action of the piston member, and an embedded connector 24 is attached to the hole 220. Ideally, the embedded connector 24 is installed at right angles to the metal plate 21, but the connector 23 gets in the way and cannot be fitted, or it is inserted diagonally and the hanging fitting is not vertical, making it difficult to install the piping. may cause problems. As a countermeasure, it is possible to make the hole 22 larger in diameter than the outside diameter of the embedded connector 24, but it is unstable because it is loosely fitted, and depending on the size of the hole 22, it may be tilted and not at a right angle. There is.

In view of these problems, the present invention is a drilling tool that can provide a hole that does not allow chips to adhere to the edge of the hole and prevent formation of cracks around the edge of the hole, and in which an embedded connector can be stably attached at right angles to a metal plate. It provides:

Means for Solving the Problems The present invention provides a piston head driven by explosive gas pressure or fluid pressure of explosives, a piston member extending to the front end of the piston head and having a shearing portion at the tip portion, the piston head and The piston member is provided with a cylinder chamber and a gun barrel for guiding the piston member, and the shearing section has a shearing end face inclined with respect to the axis at the tip WL, and the projected distance between the tip and the rear end of the outer periphery of this shearing end face is buried. A means for solving the above-mentioned problems is provided by having a part that is larger than the outer diameter of the embedded connector and has a portion in the middle thereof whose projected distance is equal to the outer diameter of the embedded connector.

Operation With the piston member retracted, the tip of the gun barrel is brought into contact with the upper surface of the folded plate or deck plate (V-) that constitutes the floor of the building,
Explosion gas pressure of gunpowder or compressed air is applied to the rear surface of the piston head, whereby the shearing portion of the piston member, which advances together with the piston head, penetrates the folded plate or the deck plate to form a hole. When the shearing section penetrates these metal plates, the tip of the outer periphery of the inclined shearing end surface first penetrates the metal plate, and then the intermediate parts on both sides gradually penetrate the metal plate to proceed with shearing. The cut-out portion of the metal plate is bent into a sheared end surface and remains attached below the edge of the hole when the trailing edge of the outer periphery has finished penetrating. The pores are non-circular;
A cut-off portion, ie, chips, is attached to one end of the scraper.

According to the present invention, when punching a hole, the force acting on the tool itself does not change, so there is no need to worry about the worker's posture collapsing.
In addition, since the slanted shearing end face pushes and bends the cut portion to one side while shearing proceeds, there is no danger of chips flying into the air or falling, allowing for safe work. Since the hole is pressed and bent to one side, there is no possibility of forming a burr around the entire periphery of the hole.

Then, in the drilled hole, a portion with a diameter equal to the outside diameter of the recessed connection contacts the opposite outer surface of the recessed connection, and chips adhering to a portion with a diameter larger than the outside diameter are removed from the recessed connection. Since it does not come into contact with the connecting tool, it can be fitted stably at right angles to the metal plate, thus making it possible to mount the hanging tool vertically.

Example Embodiments of the present invention will be described with reference to the drawings.

In Fig. 1, the cylinder chamber 2 formed in the tool body l has a mechanism at the rear for exploding empty cartridges and their gunpowder, or a mechanism for introducing and discharging a working fluid such as compressed air, and also has a damper function. The tool body 1 has a stop member 3 at the front thereof, and a gun barrel 4 extending forward is attached to the tip of the tool body 1.

A round rod-shaped piston member 60 base is screwed to the center of the piston head 5 which is airtightly fitted into the cylinder chamber 2. The piston member 6 is fitted almost tightly into the gun cavity 7 of the gun barrel 4 and its A shearing part 9 is integrally provided at the tip end via a step part 8. As shown in FIGS. 2 and 3, the shearing section 9 has an oval end surface, and has an inclined surface at an angle of 30 to 60 degrees, generally 45 degrees, with respect to the axis. has. Then, the sheared end surface 1
The projected distance A between the tip 11a and the rear end lie of the outer periphery of 0, that is, the major axis of the shearing part 9, is larger than the outer diameter of the embedded connector, and the minimum projected distance B of the intermediate portion 11b thereof is The minor diameter of the shearing section 9 is equal to the outer diameter of the embedded connector.

The piston head 5 and piston member 6 are moved back, and the tip end surface of the gun barrel 4 is brought into contact with the metal plate.

Explosion gas pressure of gunpowder or compressed air is transferred to the piston head 5.
The shearing portion 9 of the piston member 6, which moves forward together with the piston head 5, penetrates the metal plate. Fourth
．． Figure 5.6 explains the situation at that time,
The shearing part 9 is driven forward toward the metal plate P and approaches it (Fig. 4), first the tip 111 penetrates the metal plate P, then the intermediate parts 11b on both sides gradually penetrate and proceed with shearing.
The cut portion C1 is pressed and bent by the sheared end surface 10 (FIG. 5). When the rear end portion 11c penetrates the metal plate P, an oval hole H similar to the shearing portion 9 is formed,
The cut portion becomes chips C and adheres to the edge on the side through which the rear end portion lie has passed. This chip C protrudes from the edge of the hole H in a substantially perpendicularly bent state.

Figure 7.8 shows the state in which the embedded connection tool is fitted into the hole H drilled in this way, and there is a gap on the long diameter side of the hole H (Figure 7). , the short diameter side of hole H should be fitted without any gaps (Fig. 8).

Incidentally, when the piston head 5 moves forward most, it hits the stop member 3 and stops. Further, if the piston member 6 separates from the piston head 5 or breaks, the second step portion 8 hits the metal plate and stops. Furthermore, the piston member 6 has a blind hole 12 extending from the sheared end surface lO to the vicinity of the piston head 5, and is made lightweight, so that when a large number of holes are drilled in close proximity to each other in a metal plate, there is no residual stress. Consideration is given to reducing or preventing deformation around the hole.

Figure 9.10 shows different embodiments of the shear section. The shearing section designated by reference numeral 13 is hollow with a circular end surface, and has a shearing end surface 14 inclined with respect to the axis at the tip, and a shearing section 14 extending outwardly toward the rear end of the outer periphery at the tip. It has a bulging protrusion 15. Then, the sheared end surface 1
The projected distance A between the tip 16a and the rear end 16c of the outer periphery of 4 is larger than the outer diameter of the embedded connector by the height of the protrusion 15, and the maximum projected distance B of the intermediate portion 16b thereof. The diameter of the shearing section 13 is equal to the outer diameter of the implantable fitting.

When a hole is bored in the metal plate by the shearing section 13 of this embodiment, the punched chips adhere to the edge of the hole made by the protrusion 15.

Figures 1'l and 12 show further different embodiments of the shearing section. The shearing section 17 is hollow with a positive end face, and has a shearing end face 18 inclined with respect to the axis.
It has at the tip. This shearing end surface 18 turns from one corner to the opposite corner and slopes backward, and the two corner beating tip portions 19a and rear end portions 19c of the outer periphery thereof
The projected distance A is equal to the diagonal length of the shearing section 17 and is greater than the outer diameter of the implantable fitting. Also.

An intermediate portion 19b between the two corners of the outer periphery is a shearing portion 17.
NL is the portion of the projection distance B that is equal to the length of one side of NL, and this portion is equal to the outer diameter of the embedded connector.

When a metal plate is perforated by the shearing part 17 of this embodiment,
The punched chips adhere to the edge on the side through which the rear end 19c passes.

In addition, in the three embodiments described above, the sheared end surfaces 10, 14.
Within the outer periphery which performs a shearing action of 18.

In order to keep chips attached to the edge of the hole without cutting them off, the rear ends 11e, 16c, 19c and their vicinity are preferably rounded so that no sharp edges are present.

[Brief explanation of the drawing]

FIG. 1 is a partially exaggerated schematic side view of an embodiment of the present invention; FIG.
The figure is an enlarged vertical cross-sectional view of the sheared part. FIG. 3 is an end view of FIG. 2, FIG. 4, and FIG. 5. Figure 6 is an explanatory diagram of the process of drilling holes, Figures 7 and 8.
The figure is a cross-sectional view of the embedded connector fitted into the drilled hole, Figure 9 is a longitudinal cross-sectional view of a different embodiment of the shearing part, Figure 1O is an end view of Figure 9, and Figure 11. 12 is an end view of FIG. 11, and FIG. 13 is a longitudinal sectional view of a conventional embedded connector fitted into a hole. 2... Cylinder chamber, 4... Gun barrel, 5...
... Piston head, 6 ... Piston part K + L 13 +17 ... Shearing part, 10
, 14.18...°... sheared end surface, lla. 16a, 19a... tip, llb, 16b
, 19b --- middle part, lie, 16c, 19
c... Rear end.

Claims (1)

[Scope of Claims] A piston head driven by explosive gas pressure or fluid pressure of gunpowder, a piston member that extends forward of the piston head and has a shearing portion at its tip, and a cylinder chamber that guides the piston head and the piston member. and a gun barrel, the shearing portion has a shearing end surface inclined with respect to the axis at the tip, and the projected distance between the tip and the rear end of the outer periphery of the shearing end surface is longer than the outer diameter of the embedded connector. A drilling tool characterized in that the drilling tool is large and has a portion in the middle thereof whose projected distance is equal to the outer diameter of the embedded connector.