JPH0333047B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides holes for attaching various attachments such as inserts for attaching hanging objects and wiring boxes to thin iron plates such as deck plates and keystone plates. This invention relates to a deck plate cutting tool for cutting and shaping.

[Conventional technology]

For example, to attach an insert to a thin iron plate such as a deck plate or a keystone plate, a hole is drilled using an electric drill, and the insert is hammered into the hole to be fixed. This method of drilling holes for inserts using an electric drill requires an electricity supply, and depending on the construction site, electricity may have to be supplied using a cord from a distant power source. The cord had to be routed every time the location of the hole was changed, which was extremely troublesome.

Therefore, another method for making holes in thin iron plates without using an electric drill is to use a punching tool. In this method, as shown in FIG. 16, a conical punch 42 is impactfully struck against a thin iron plate 44 to punch out a hole 46. Since punching is a punching process, a large striking force is required, and the number of punches is The hole 46 cannot be punched out unless it is also hammered.
Moreover, there is a problem in that the punched piece 48 remains over the entire circumference of the hole 46.

[Problem that the invention seeks to solve]

The present invention provides a spiral inclined surface corresponding to the helical shape of a male fixing screw provided on an attachment at the peripheral part of a screw hole to be cut and raised, and moreover, on the lower surface of the deck plate, at the same time as the screw hole is formed. The purpose is to form.

[Means for solving problems]

In the present invention, the distal end surface of the cutting and edging tool body is inclined with respect to the attaching direction, the tip of the cutting and edging tool body serves as a cutting tip, and the distal end surface of the cutting and edging tool main body The peripheral part of the cut-and-raise tool is a cutting blade, and the base end of the cutting-and-raise tool body is formed with a spiral inclined surface corresponding to the helical shape of the male fixing screw provided on the attachment. This is a deck plate cutting tool.

〔Example〕

1 to 4 show a deck plate cutting and raising tool _A1 according to the present invention.

This deck plate cutting and raising tool _A1 has a cutting and raising tool main body 4 provided integrally with a holder 2. The cross section of the cutting tool main body 4 has a shape that is a combination of a semicircle and a square, as shown in FIG. The tip of the cutting tool main body 4 is cut off diagonally. Therefore, the tip surface 7 of the cutting and raising tool main body 4 is inclined with respect to the driving direction Q.
The periphery of the tip surface 7 serves as a cutting edge 8.

As shown in FIG. 4, the diameter d' of the semicircular cross section of the cutting tool main body 4 is the diameter d of the valley of the male fixing screw 10 provided in the insert B (see FIG. 10). The length of one piece of the rectangular cross section is d', and the length of the other side is the diameter of the thread of the male fixing screw 10 provided in insert B. It is 1/2 of D (see Figure 10). The diameter E' of holder 2 is the diameter of insert B
The diameter is smaller than the diameter E of the seat plate 22 provided in the seat plate 22.

Further, on the end surface of the holder 2 around the proximal end of the cutting and raising tool main body 4, there is a spiral inclined surface 1 corresponding to the thread of the male fixing screw 10 provided on the insert B.
2 is formed.

If the fixing male screw 10 of the insert B is a right-handed screw, the spiral inclined surface 12 gradually becomes lower in the clockwise rotation direction when the base tool main body 4 is facing upward. It's slanted like that. When the male fixing thread 10 of the insert B is a left-handed thread, the direction of inclination of the spiral inclined surface 12 is opposite to the above.

In addition, the step of the spiral inclined surface 12 is P for 1 pitch when the male fixing screw 10 is a single thread (2P for 2 pitches when the male fixing screw 10 is a double thread). is a part with a square cross section,
It is located in the corner of. In this way, the step part of the spiral inclined surface 12 is provided at the corner of the part with a square cross section because the screw hole 14 is cut and formed by hitting the cutting tool _A1 against the deck plate C. This is to reduce the impact force.

A notch 16 is provided at the base end of the cutting and raising tool main body 4 so that the spiral upper inclined surface 12 can easily come into close contact with the deck plate C during nailing.

In order to cut and form the screw hole 14 for fixing the insert B to the deck plate C using the deck plate cutting tool _A1 , as shown in FIGS. When the tip 6 provided at the tip of the main body 4 is applied to the deck plate C, and in this state a nailing tool (not shown) is used to hit the cutting and raising tool _A1 , the hitting force is applied to the tip 6. Focusing on this, the deck plate C in this area is first cut and raised (FIG. 5), and the cut and raised tongue piece 18 comes into close contact with the distal end surface 7 of the cutting and raising tool main body 4.

Once cut and raised, the deck plate C is continuously cut and raised with a small force by the cutting and raising blade 8 following the cross-sectional shape of the cutting and raising tool main body 4, and the holder 2
The spiral inclined surface 12 formed on the end surface of the screw is impactfully struck against the deck plate C, and the screw hole 14 is
is formed around the screw hole 14 and on the lower surface of the deck plate C.
A spiral inclined surface 20 corresponding to the spiral inclined surface 12 formed on the end surface of the holder 2 is formed. The cut and raised tongue piece 18 is cut and raised at approximately 90° so as to be in close contact with the side surface of the rectangular cross section of the cutting and raising tool main body 4 (FIG. 6).

Here, since the spiral inclined surface 12 provided on the end surface of the holder 2 corresponds to the spiral shape of the thread of the male fixing screw 10 provided on the insert B,
In FIG. 6, if the distances from the upper surface of the deck plate C to the points F ₁ , F ₂ , and F ₃ on the spiral inclined surface 20 that differ by 90 degrees are respectively t ₁ , t ₂ , and t ₃ , then (t ₃ −t ₂ )=(t ₂ −t ₁ )=P/4.

Therefore, as shown in FIGS. 9 and 10, the seat plate 22 of the insert B is attached to the deck plate C.
When the fixing male screw 10 is screwed into the screw hole 14 until it comes into close contact with the top surface, the top surface of the screw thread of the fixing male screw 10 is located at the periphery of the screw hole 14, and also forms a spiral formed on the bottom surface of the deck plate C. The spiral inclined surface 20 functions like a female screw, and the spiral inclined surface 20 and the fixing male screw 10 of the insert B are screwed together.

As a result, the deck plate C is sandwiched between the seat plate 22 of the insert B and the screw thread of the male fixing screw 10, and the insert B is firmly fixed to the deck plate C.

Incidentally, when screwing the insert B, a part of the male fixing screw 10 comes into contact with the tongue piece 18, so that the insert B can be screwed into the screw hole 14 in a stable posture.

FIG. 11 shows another deck plate cutting tool _A2 according to the present invention, and FIGS.
FIG. 3 shows a screw hole 14 formed in the deck plate C by this cutting and raising tool _A2 .

This deck plate cutting and raising tool _A2 is provided with a protrusion 24 in the driving direction Q on a portion of the cutting and raising tool main body 4 having a semicircular cross section in order to make cutting easier. The distal end is a tip portion 26.

For this reason, the contact area between the decking plate C and the cutting and raising tool ₂ at the beginning of cutting and raising becomes extremely small, so the striking force is concentrated on the cutting tip 26 provided at the tip of the protrusion 24, and therefore the decking plate It becomes easier to cut into C, and the screw hole 14 can be cut and formed with a small hammering force.

The deck plate cutting and raising tool _A3 shown in FIGS. 14 and 15 has a stepped part of the spiral inclined surface 12 in the protrusion 24, thereby reducing the striking force.

In addition, 28 in the figure is a deck plate cutting tool A ₂ ,
The attachment screw for attaching A ₃ to the nailing tool is shown.

The cross-sectional shape of the cut-and-raise tool main body 4 in the above embodiment is a combination of a semicircle and a square, but it can also be triangular, circular, or the like.

〔Effect of the invention〕

Further, according to the present invention, a spiral inclined surface for screwing in a fixing male screw provided on an attachment such as an insert can be formed at the peripheral portion of the screw hole at the same time as the screw hole. Therefore, by screwing the attachment into the screw hole, the fixing male screw provided on the attachment and the spiral inclined surface provided around the screw hole become screwed together, and the attachment becomes Since the deck plate is sandwiched between the seat plate and the thread of the male fixing screw, it is possible to firmly fix an attachment such as an insert to the deck plate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a deck plate cutting tool _A1 according to the present invention, FIG. 2 is a front view, FIG. 3 is a cross-sectional view, and FIG. 4 is a main body of the cutting plate. 4 is a plan view for explaining the shape of No. 4, and FIGS. 5 and 6 are perspective views at the beginning and after the screw hole 14 is cut out and formed in the deck plate C using the cutting tool _A1 , respectively. 7 and 8 are cross-sectional views taken along the X-X line and Y-Y line in FIG. The sectional view, FIG. 11, is a perspective view, FIG. 12, and FIG. 13 of the deck plate cutting and raising tool _A2 according to the present invention.
The figures are perspective views at the beginning and after the screw hole 14 is cut and formed in the deck plate C using the cutting and cutting tool _A2 , respectively, and FIG. 14 is a perspective view of the deck plate cutting and cutting tool _A3 according to the present invention. 15 is a front view, and FIGS. 16A and 16B are views before and after punching a hole 46 in a thin iron plate 44 with a conventional punch 42, respectively. The explanation of the symbols of the main parts is as follows.
A ₁ , A ₂ , A ₃ : Depth plate cutting tool, B: Insert (mounted item), C: Depth plate,
2: Holder, 4: Cutting and raising tool body, 6, 26: Cutting tip, 8: Cutting and raising blade, 10: Male screw for fixing, 1
2: Spiral inclined surface provided on the cutting tool main body, 1
4: Screw hole, 20: Spiral inclined surface provided around the screw hole, 24: Projection.

Claims (1)

[Claims] 1. The distal end surface of the cutting and edging tool main body is inclined with respect to the attaching direction, and the tip of the cutting and edging tool main body serves as a cutting tip, and the cutting and edging tool main body The peripheral part of the distal end surface of the tool is a cutting blade, and a spiral inclined surface corresponding to the spiral shape of the male fixing screw provided on the attachment is formed at the base end of the tool body. Features: Detsuki plate cutting tool. 2 Providing a protrusion on the cutting and raising tool body in the nailing direction,
The deck plate cutting and raising tool according to claim 1, wherein the tip of the protrusion is a cutting tip.