JPH08323521A - Hole saw mounting device for keypunch - Google Patents

Abstract

PURPOSE: To enable a hole saw to be attached and detached in a single operation by fitting a bush ring or the outside of a coupling in a vertically movable manner and forming a clearance groove on the inside of the bush ring which is constantly being pushed out downwards by a spring. CONSTITUTION: When a hole saw 12 is to be mounted, a bush ring 8 is pulled up, a clearance groove 9 and a stopper 11 matched, and under this state, the mounting shaft 13 for the hole saw 12 is inserted into a fitting hole 3. The mounting shaft 13 for the hole saw 12 is inserted into a specified position and a stopper fitting groove 14 on the mounting shaft 13 is faced against the stopper 11. Under this state, the bush ring 8 is released and descends by the force of a spring 10. At this time, the head part 11a of the stopper 11 is pushed by the inside of the bush ring 8 and its end 11 enters into the stopper fitting groove 14 on the mounting shaft 13 for the hole saw 12. Thus the hole saw 12 does not come off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole saw mounting device in a drilling machine used for drilling pipes such as gas conduits and water pipes.

[0002]

2. Description of the Related Art A circular blade generally called a hole saw is used for perforating pipes such as gas conduits and water pipes. Conventionally, this hole saw is attached to the lower end of a main shaft rotated by a motor by a screw connection method.

[0003]

Therefore, there are the following drawbacks. a. Due to the screw connection, it is difficult to attach and detach. b. It takes time to put on and take off. c. Since the screw is opposite to the rotating direction of the hole saw, a force in the tightening direction is applied to the screw at the time of punching, and the screw becomes hard. Therefore, the screw may not easily loosen when the hole saw is removed. d. The screw thread may not be able to be screwed in smoothly if it hits something. e. If chips etc. get into the roots of the screws, it is necessary to clean them one by one, which is troublesome.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and the constitution thereof is as follows. 1. A downward hexagonal coupling with a fitting port was attached to the lower end of the main shaft rotated by a motor, and a stopper mounting hole was provided in a part of the side wall of this coupling in the horizontal direction. The push ring is attached to the outside of the push ring so that it can move up and down, and an escape groove is formed on the inner surface of the push ring. This push ring is always pushed downward by a spring. Forming a stopper fitting groove at a position facing the stopper mounting hole, and incorporating a stopper slightly larger than the length of the stopper mounting hole in the stopper mounting hole. A mounting device for a hole saw in a characteristic punching machine. 2. While forming the fitting port of the coupling in a square,
2. A hole saw attachment device for a perforator according to claim 1, wherein the attachment shaft on the side of the hole saw that fits into this fitting port is formed in a square shape. 3. 3. A hole saw for a perforator according to claim 1 or 2, wherein a small diameter portion is formed at an inner end portion of a stopper built-in hole of the coupling, and the stopper is configured so as to be engaged with the small diameter portion and not fall into the fitting port. Mounting device. 4. By forming a large diameter part at the outer end of the stopper built-in hole of the coupling, and forming a head part that engages with this large diameter part on the stopper side, the stopper engages the head part with this large diameter part. The hole saw mounting device in the boring machine according to the above 1 or 2, which is configured so as not to fall into the fitting port.

[0005]

When the hole saw is attached, the push ring is pulled upward so that the escape groove is aligned with the stopper. In this state, when the attachment shaft of the hole saw is inserted into the fitting opening, the stopper retracts into the escape groove. When the mounting shaft of the hole saw is inserted to a predetermined position, the stopper fitting groove formed in the mounting shaft of the hole saw faces the stopper. When the push ring is released in this state, the push ring descends due to the force of the spring, at which time the stopper head (outer end) is pushed by the inner surface of the push ring, and the tip comes into the stopper fitting groove of the mounting shaft of the hole saw. enter. As a result, the Horso cannot come off. The rotation of the main shaft is transmitted to the hole saw as it is because the fitting port is hexagonal or square and the mounting shaft of the hole saw is hexagonal or square.

When removing the hole saw, if the push ring is pulled up against the spring and the escape groove is aligned with the position of the stopper, the stopper head can escape to this escape groove side. The attachment shaft can be removed from the fitting port simply by pulling it downward.

[0007]

Embodiments of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a main shaft that is rotated by a motor, and a lower end (tip) of the main shaft 1 is attached with a coupling 2 having a fitting port 3 in which a downward hexagonal portion 4 is formed. Reference numeral 5 is a stopper mounting hole that is provided substantially horizontally in the middle of the fitting port 3 so as to penetrate horizontally, 6 is a stopper rib formed at the lower end of the outer periphery of the coupling 2, and 7 is a spigot portion.

Reference numeral 8 is a push ring mounted on the outer periphery of the coupling 2 so as to be vertically movable, and an escape groove 9 is formed on the inner peripheral surface of the push ring 8. 10
Is a spring that constantly urges the push ring 8 downward.

Reference numeral 11 denotes a stopper incorporated in the stopper mounting hole 5, and the stopper 11 has an oblong shape composed of a head portion 11a and a tip 11b, and is slightly longer than the length of the stopper mounting hole 5. large. Further, as shown in FIG. 3, the stopper 11 has a stopper mounting hole 5
The small-diameter portion 5a formed at the inner end of the member is designed so as not to fall into the fitting port 3 side. As shown in FIG. 4, a large diameter portion 5b is formed on the outer end of the stopper mounting hole 5 and a head portion 11a is formed on the stopper 11 side so as to prevent the stopper 11 from falling. Then
The head portion 11a may be configured to engage with the large-diameter step portion 5b.

Reference numeral 12 is a hose and 13 is a mounting shaft of the hose 12 having a hexagonal portion 13a.
A part of the outer periphery (hexagonal part 13a) is formed with a stopper engaging groove 14 that faces the stopper 11 (stopper incorporating hole 5) when the mounting shaft 13 is inserted into the fitting opening 3 to a predetermined position. Has been done. The fitting port 3 on the coupling 2 side and the mounting shaft 13 may be quadrangular instead of hexagonal.
Further, this hexagon or quadrangle may be formed in the mounting hole 3 and the mounting shaft 13 in whole or in part. Reference numeral 15 is a center drill.

Next, the operation of the above embodiment will be described. When attaching the hole saw 12, the push ring 8 is pulled upward to align the escape groove 9 with the stopper 11, and when the attachment shaft 13 of the hole saw 12 is inserted into the fitting opening 3 in this state, the stopper 11 retracts into the escape groove 9. To do. When the mounting shaft 13 of the hole saw 12 is inserted to a predetermined position, the stopper fitting groove 1 formed on the mounting shaft 13 of the hole saw 12
4 faces the stopper 11. When the push ring 8 is released in this state, the push ring 8 is lowered by the force of the spring 10, and at this time, the head 11a of the stopper 11 is moved.
The (outer end) is pushed by the inner surface of the push ring 8 and the tip 11
b is a stopper fitting groove 14 of the mounting shaft 13 of the hole saw 12.
Get in. As a result, the hole saw 12 cannot be removed. Spindle 1
Since the fitting port 3 has a hexagonal shape or a square shape and the mounting shaft 13 of the hole saw 12 has a hexagonal shape or a square shape, the rotation is transmitted to the hole saw 12 as it is.

When removing the hole saw 12, the push ring 8 is pulled up against the spring 10 and the escape groove 9 is aligned with the position of the stopper 11.
Since the head 11a of No. 1 can escape to the side of the escape groove 9, the mounting shaft 13 can be disengaged from the fitting port 3 only by pulling the hole saw 12 downward.

[0013]

As described above, according to the present invention, the hole saw can be attached to the rotary shaft of the punching machine by inserting the attaching shaft of the hole saw into the fitting opening of the coupling, and the pull ring can be pulled up. Can be removed. As a result, the following effects are achieved. a. Since the hole saw can be attached and removed with one touch, attaching and detaching the hole saw is easier and less time consuming than the conventional screw method. b. Since the reverse screw method is not adopted, there is no problem that the tightening force acts when the load is applied to the hole saw so that it cannot be loosened. c. There is no need to worry about damage to the screw threads or cutting chips entering the valleys of the screws as in the conventional case.

[Brief description of drawings]

FIG. 1 is an explanatory view of a mounting device according to the present invention immediately before a horusaw is mounted.

FIG. 2 is an explanatory view of a state in which a hole saw is attached.

FIG. 3 is an explanatory view of a stopper portion.

FIG. 4 is an explanatory view of another embodiment of the stopper portion.

[Explanation of symbols]

 1 Spindle 2 Coupling 3 Fitting Port 4 Hexagonal Part 5 Stopper Assembly Hole 5a Small Diameter Part 5b Large Diameter Part 6 Stopper Rib 7 Inlay Part 8 Push Ring 9 Escape Groove 10 Spring 11 Stopper 11a Head 11b Tip 12 Horsaw 13 Mounting Shaft 14 Hexagonal part 15 Center drill

Claims (4)

[Claims] 1. A downwardly hexagonal coupling with a fitting port is attached to the lower end of a main shaft rotated by a motor, and a stopper mounting hole is horizontally provided in a part of a side wall of the coupling. A push ring is mounted on the outside of the coupling so that it can move up and down, and an escape groove is formed on the inner surface of the push ring, and the push ring is constantly pushed downward by a spring. A part of the outer circumference of the mounting shaft, and a stopper fitting groove is formed at a position facing the stopper mounting hole, and a stopper slightly larger than the length of the stopper mounting hole is provided in the stopper mounting hole. A mounting device for a hole saw in a drilling machine, characterized by being incorporated. 2. The hole saw attachment device for a punching machine according to claim 1, wherein the fitting opening of the coupling is formed in a quadrangle, and the attachment shaft on the side of the holso which is fitted into the fitting opening is formed in a quadrangle. 3. The coupling according to claim 1, wherein a small diameter portion is formed at an inner end portion of the stopper mounting hole of the coupling, and the stopper is configured so as to be engaged with the small diameter portion and not fall into the fitting port. A mounting device for a hole saw in the described punching machine. 4. A stopper is formed on the large diameter portion by forming a large diameter portion on the outer end of the stopper mounting hole of the coupling and forming a head portion engaging with the large diameter portion on the stopper side. 3. A hole saw attachment device for a boring machine according to claim 1, wherein the parts are configured so as not to be engaged with each other so as not to fall into the fitting port.