JP2711344B2 - Oval Hole Drilling Machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling machine for drilling an oval hole in a wall board made of gypsum board, veneer board or the like in an electric wiring work.

[0002]

2. Description of the Related Art In electrical wiring work, switch boxes for storing switches are roughly classified into a square type and an oval type. It is necessary to make an oval hole in the wallboard in response to the above.

Conventionally, when an oval hole is made in a wall plate W, as shown in FIG. 10, a cutting tool for making a circular hole called a "horsaw" is used to form a hole at a predetermined interval. To form two circular holes 41, and thereafter each circular hole 41
The remaining portion 42 was cut off by a cutter. For this reason, the work for forming an oval hole is very troublesome and time-consuming. Further, after the circular hole is cut by the hole saw, the
In some cases, the electric wires routed inside the wall plate W (the back of the wall) may be damaged.

[0004] In addition, an oval hole (an ellipse) which is the object of the present invention.
Opening of an elliptical hole to open a circular hole)
-113801 is known.
You. This drilling machine has a pair of holes arranged at a predetermined interval.
A chainwheel is mounted on one of the guide drills
At the same time, freewheels are installed on the other side,
Roller chains with cutting blades between each wheel
It is a configuration in which the mounted equipment is supported and stored in the reduction gear box.
Then, the chain wheel is driven and rotated to
The roller chain rotates around the roller chain,
An elliptical hole is made in the wall by the attached cutting blade.
You. According to this drilling machine, it is possible to drill an elliptical hole.
Is driven by two guide drills.
Immediately after drilling is completed, because the mark is reliably determined
, Through the drilled hole, the roller chain of the drilling machine
Part is pushed out to the front and wired behind the wall
There is a risk of damaging the wires. Also, the cutting blade
The part of the installed roller chain is
And does not move back and forth, and the cutting blade is
Always protrudes (exposes) a predetermined length forward from the opening surface
As a result, the cutting blade is easily damaged during non-operation.
It is also dangerous.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to make it possible to automatically form an oval hole without damaging electric wires wired behind a wall. I have.

[0006]

An oval hole punching machine according to the present invention for solving this problem includes a case in which a front end face is open and can be in close contact with a wall plate; And a punching machine body housed in the body. The punching machine body is provided with a track-like traveling member that travels in the form of a track at the front end of the frame, and the track-like traveling member has a large number of cuts. Blades are attached at predetermined intervals, and a positioning rod is urged in a protruding direction by a first urging means at a center portion of the track-shaped traveling member and supported by the frame, and the positioning rod is attached to the case. The punching machine main body is urged in the storage direction by the second urging means and stored, and the handle is attached to the punching machine main body in the case through a long hole in the peripheral wall of the case. Features.

[0007]

The handle is held in close contact with the wall plate by holding the handle with one hand of the operator, and the positioning rod is inserted into the positioning hole provided at the center of the oval hole to be formed in the wall plate. In the inserted state, the track-like traveling member attached to the tip of the punch body is caused to travel around by the driving means, and the truck is driven against the urging force of the second urging means.
When the hook-shaped traveling member is pressed against the wall plate, the wall plate is cut into an oval shape by a large number of cutting blades attached to the track-shaped traveling member. In addition, the track-like traveling member has one
Run around the positioning rod in a track
The rotational force that always tries to rotate in the
Working. Therefore, when the cutting of the wallboard is completed,
The track-like running that is about to rotate in the circumferential direction
The inner peripheral surface of the oval hole opened by the rotational force of the row member
And the cutting blade bites into the oval-shaped plate
Therefore, the torque for driving the track-like traveling member
Increase rapidly. This will tell you the end of the cut
Also, make sure that the wires routed behind the wall are not damaged by the cutting blade.
It becomes.

[0008]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a perspective view of an oval hole punching machine according to the present invention, FIG. 2 is a side view of a punching machine body A, FIG. 3 is a front view thereof, and FIG. FIG. 5 is a partially enlarged perspective view of a track-shaped traveling member T constituting the punching machine main body A. 1 to 5, a case C in which an oval hole punching machine according to the present invention has a front end face opened so as to be able to adhere to a wall plate.
And a punching machine main body A movably stored in the case C.

The drilling machine main body A includes a track-like traveling member T made of a roller chain at the tip of a cylindrical frame F.
Are mounted so as to be able to run around. In the cylindrical frame F, a small-diameter portion 2 is provided integrally at the center of the large-diameter portion 1 so as to protrude rearward, and a cylindrical rotating section 3 is also provided in the cylindrical small-diameter portion 2. Its front and rear ends are rotatably supported via bearings 4 and 5, respectively. At the rear end of the rotary cylinder 3, a rotary engagement member 7 engaged with a rotary shaft of a rotary driving tool 6 (see FIG. 6) is screwed, and a collar 7 a of the rotary engagement member 7 and the rotary cylinder The bearing 5 is disposed between the bearing 5 and the end face of the frame 3, and the bearing 4 comes into contact with a step provided at the rear end of the small-diameter portion 2 of the frame F, so that the forward movement of the rotary shaft 3 is restricted. Have been.

At the front end of the large diameter portion 1 of the frame F, two support shafts 8 and 9 are fixed at a predetermined interval in parallel with the rotary cylinder 3 by screwing. 8, a spur gear 12 is rotatably supported via a bearing 11, a sprocket 13 is screwed to the spur gear 12, and the sprocket 13 is rotatably supported on a support shaft 8 via a bearing 14. ing. Another sprocket 16 is rotatably supported on the other support shaft 9 via a pair of bearings 15. A track-like traveling member T composed of a roller chain is mounted between the two sprockets 13 and 16. Further, a spur gear 17 is screwed to a tip end of the rotary cylinder 3, and the spur gear 17 meshes with the spur gear 12. Therefore, when the rotating shaft 3 is driven and rotated, the sprocket 13 is rotated via the spur gears 17 and 12, and the track-like traveling member T travels around. As shown in FIG. 3, the track-shaped traveling member T has a track shape (an oval shape) in which semicircles at both ends are connected by straight lines.

A positioning rod 18 is provided in the rotary cylinder 3.
Is stored, and the other portion penetrates the spur gear 17 and protrudes forward. A bearing 19 is integrally attached to a base end portion of the positioning rod 18 so that the rotation of the rotary cylinder 3 prevents the positioning rod 18 from rotating, and a compression spring 21 provided inside the rotary cylinder 3. Thus, the positioning rod 18 is urged in the protruding direction. A support plate 2 is provided on the front end surfaces of the two support shafts 8 and 9.
2 is attached, and an intermediate portion of the positioning rod 18 is supported by the support plate 22.

The track-like traveling member T is formed of a roller chain, and as shown in FIGS. 3 and 5, a cutting blade mounting plate is provided on each link 23 of the roller chain so as to face outward. 23a are provided integrally, and are provided at the same position along the circumferential direction.
The cutting blade 24 is attached to each of the cutting blade mounting plates 23a via the screw 20, and the blade portion 24a of the cutting blade 24 projects from the cutting blade mounting plate 23a by a predetermined length.

On the other hand, as shown in FIGS. 1 and 4, a case C for accommodating the punching machine main body A can slide the large diameter portion 1 of the frame F constituting the punching machine main body A. A box-shaped second storage part 26 for storing the track-like traveling member T with a margin is integrally provided at a front portion of the cylindrical first storage part 25 for storing the first storage part. A cylindrical third storage part 28 for storing a part of the compression spring 27 is provided at the rear end of the part 25 and is provided integrally with the first storage part 25. On the peripheral wall of the first storage portion 25 of the case C, an elongated hole 31 for moving a handle 29 described later in the front-rear direction is provided.

The large diameter portion 1 of the frame F constituting the punching machine main body A is slidably stored in the first storage portion 25 of the case C and provided on the inner peripheral surface of the first storage portion 25. The rear end surface of the large-diameter portion 1 abuts against the stopper surface 25a, and the retreat end position of the drilling machine main body A with respect to the case C is determined. The small-diameter portion 2 of the frame F constituting the punching machine main body A penetrates through the third storage portion 28 of the case C and protrudes rearward. The compression spring 27 fitted on the outer periphery of the small-diameter portion 2 Both ends are regulated and compressed by a flange at the tip of the third storage portion 28 and a nut 30 screwed to the rear end of the small diameter portion 2. Therefore, the punching machine main body A housed in the case C is urged to the rear of the case C (the case
In the direction in which it is stored in the storage device C ). The base end of the handle 29 is inserted into a long hole 31 provided in the case C, and is screwed to the large diameter portion 1 of the frame F constituting the punching machine main body A. For this reason, the compression spring 27
The punch 29 can be pushed out of the case C by the handle 29 against the restoring force of
When the force applied to the handle 29 is released, the perforator body A is retracted in the case C to the retracted end by the restoring force of the compression spring 27.

Then, in order to make an oval hole in the wallboard W using the above-described punching machine, the following is performed. First, as shown in FIG. 7, a portion where the switch box S is located inside the wall plate W is predicted, and a positioning hole 32 into which the positioning rod 18 can be inserted is formed in a center portion thereof by using a drill. . Next, as shown in FIG. 8, the positioning rods 18 are inserted into the positioning holes 32 formed in the wall plate W.
To make the open end face of the case C abut against the wall plate W. In the illustrated example, the positioning rod 18 passes through a center hole provided in the bottom plate of the switch box S, and abuts on a post 33 behind it.

Next, as shown in FIG.
Holds the rotation driving tool 6 with one hand and engages the rotation shaft with the rotation engagement body 7 of the punch body A,
Holding the handle 29 with the other hand, press the open end surface of the case C against the wall plate W. When the rotating member 3 of the drilling machine main body A is driven and rotated by the rotary driving tool 6, the track-shaped traveling member T to which the plurality of cutting blades 24 are attached is inserted into the positioning hole 32 by the above-described transmission mechanism. As a result, the vehicle moves stably around the positioning rod 18 which has been immobilized and becomes a track (oval) around the positioning rod 18. In this state, the compression spring 27 resists the restoring force.
When the puncher body A is pushed toward the wall plate W by the handle 29, as shown in FIG. 9, each cutting blade 24 of the track-shaped traveling member T gradually bites into the wall plate W, The wall plate W is cut into an oval shape (see FIG. 7). In addition, in accordance with the advance of the punch body A, the positioning rod 18
The compression spring 21 enters the rotary cylinder 3 against the restoring force.

When the cutting of the wall plate W is completed, the track
The hook-shaped traveling member T is centered on one positioning rod 18.
And run around in a track shape, and always rotate in the circumferential direction
Since the rotational force to be applied is acting and the cut oval plate is non-circular, the oval plate is slightly rotated around the track-shaped traveling member T in the circumferential direction , Since the cutting blade 24 is sandwiched between the inner peripheral surface of the oval hole 34 formed in the wall plate W and the cut oval plate, the rotational torque required for the rotary driving tool 6 sharply increases.
Thus, the worker M knows that the cutting has been completed. As described above, when the oval hole 34 is cut in the wall plate W, the traveling of the track-shaped traveling member T is immediately stopped, so that the cutting blade 24 attached to this runs largely into the inside of the wall plate W. As a result, as a result, the inside of the wall plate W (the wall
The wires wired on the back) are not damaged. In addition, chips are generated during the cutting operation, but the chips are collected in the case C that is in close contact with the wall plate W and do not scatter around, so that the cutting operation can be easily performed. After the cutting is completed, when the pressing force applied to the handle 29 is released, the punching machine main body A retreats to the retreat end in the case C by the restoring force of the compression spring 27.

In the above embodiment, the rotary cylinder 3 of the drilling machine main body A is driven and rotated by the separate rotary driving tool 6, but the drilling machine main body A may be provided with an electric motor. Good.

[0019]

The oval hole punching machine according to the present invention has the above-described structure, and therefore has the following effects. (1) A positioning hole is provided in the center of an oval hole to be formed in a wall plate, and a positioning rod is inserted through the positioning hole, and an operator is operated in a state where an opening end surface of the case is in contact with the wall plate. Hold the handle with one hand of the second biasing hand
Against the urging force of the step, the track-like traveling member mounted on the tip of the punch body is made to travel around and pressed against the wall plate, so that a large number of cutting blades attached to the Oval holes can be opened at once. As a result, an oval hole indispensable for wiring of the oval switch box can be easily formed in the wall plate in a short time and without any labor. (2) After cutting the oval hole, the cutting blade is sandwiched between the inner peripheral surface of the oval hole and the cut oval plate, and the torque required for the traveling of the track-shaped traveling member sharply increases. Therefore, the operator can immediately know the end of the cutting of the oval hole. For this reason, the cutting blade enters the inside of the wall plate and wires
This eliminates the problem of damaging damaged wires. (3) Since the track-like traveling member travels in a track shape with reference to the positioning rod inserted into the positioning hole of the wall plate, the traveling accuracy is high even though the traveling locus is non-circular. The positioning rod is secured in a short time, and the positioning rod is urged in the protruding direction and can be retracted. Therefore, a switch box, a pillar, and the like exist in front of the positioning rod. in case of,
Since it retreats freely, it does not hinder the drilling operation. (4) A large amount of swarf is generated when the wall plate is cut, but the swarf is stored in a case that is in close contact with the wall plate and does not scatter around, so that the working environment is improved and the work environment is improved. Efficiency goes up. (5) When not in use, the main body of the drilling machine is retracted to the retreat end in the case by the second urging means, and the many cutting blades attached to the track-like traveling member are completely stored in the case. So it is safe.

[Brief description of the drawings]

FIG. 1 is a perspective view of an oval hole punching machine according to the present invention.

FIG. 2 is a side view of a punching machine main body A.

FIG. 3 is a front view of the same.

FIG. 4 is an overall sectional view of an oval hole punching machine according to the present invention.

FIG. 5 is a partially enlarged perspective view of a track-shaped traveling member T constituting the punching machine main body A.

FIG. 6 is a perspective view of the drilling machine according to the present invention in use.

FIG. 7 is a front view of the wall plate W in which the oval hole 34 is formed.

FIG. 8 is a schematic sectional view of a state in which a case C is in contact with a wall plate W.

FIG. 9 is a schematic sectional view of a state immediately before cutting in which a case C is in contact with a wall plate W.

FIG. 10 is a view for explaining a conventional method of forming an oval hole.

[Explanation of symbols]

 A: Drilling machine body C: Case F: Frame T: Track-shaped traveling member W: Wall plate 18: Positioning rod 21: Compression spring (first urging means) 24: Cutting blade 27: Compression spring (Second urging) Means) 29: Handle 31: Slot 34: Oval

Claims (2)

(57) [Claims] 1. A frame comprising a case having an opening at a front end surface and capable of closely adhering to a wall plate, and a punching machine main body accommodated in the case, wherein the punching machine main body is provided at a front end of a frame. A track-like traveling member that travels in a track-like shape is mounted on the portion, a number of cutting blades are attached to the track-like traveling member at predetermined intervals, and a positioning rod is provided at the center of the track-like traveling member. It is configured to be urged in the protruding direction by the first urging means and supported by the frame,
The punch body is housed in the case by being urged in the housing direction by the second urging means, and a handle is attached to the punch body in the case through a long hole in a peripheral wall of the case. Holding the handle with one hand of an operator, bringing the case into close contact with the wall plate, and inserting the positioning rod into a positioning hole provided at the center of an oval hole to be formed in the wall plate. By driving the track-like traveling member mounted on the tip of the punching machine body around the driving means and pressing it against the wall plate, the wall plate is cut by the large number of cutting blades attached to the track-like traveling member. An oval hole punching machine characterized by being cut into an oval shape. 2. The oval hole for an oval hole according to claim 1, wherein the track-like traveling member is constituted by an endless roller chain, and a cutting blade is attached to a link constituting the roller chain. Drilling machine.