WO2005014211A1

WO2005014211A1 - Core bit mounting and removing structure

Info

Publication number: WO2005014211A1
Application number: PCT/JP2004/011408
Authority: WO
Inventors: Kigen Agehara; Tomofumi Ichiba; Michio Yamashita; Naohide Murakami
Original assignee: Max Co., Ltd.
Priority date: 2003-08-07
Filing date: 2004-08-03
Publication date: 2005-02-17
Also published as: JP2005053192A; JP4433721B2

Abstract

The outer peripheral surface of a mounting section (13) formed on the rear end of a core bit (10) is formed with an annular groove (17) and an annular flange (14). Mutually fitting rotation locking sections (16, 21) are formed between the end surface of the cylindrical member (20) of a chuck (2) and the end surface of the annular flange (14). A drawing means (23) formed with an engaging pawl member (24) adapted to engage the annular groove (17) in the core bit (10) is slidably installed on the chuck (2). The rotation locking sections (16, 21) are mutually fitted by engaging the engaging pawl member (24) of the drawing means (23) with the annular groove (17).

Description

Core bit attachment / detachment structure

According to the present invention, a hollow core bit having a perforated blade formed at a tip thereof is mounted on a chuck portion of a tool such as a concrete drill driven by power such as electric power or compressed air, and the core bit is rotated and illuminated. The present invention relates to a tool such as a concrete drill for making a hole in a concrete wall or a stone material, and more particularly to a core bit writing / unloading mechanism for attaching and detaching a core bit to and from a chuck. Background art

Use a concrete drill driven by power such as electric power or compressed air when performing piping work for gas, water, cooling or heating, etc. on the wall, floor or foundation of a building constructed of concrete. Drilling work is performed on these walls. By rotating and (and if necessary) vibrating the concrete drill attached to the chuck formed at the tip of the concrete drill from the concrete drill side, a cylindrical drilling blade formed at the tip of the core bit is used to form the concrete wall. Drill a hole of a predetermined diameter. Various types of core bits are prepared according to the diameter and depth of the hole to be drilled, and the core bit is exchanged according to the diameter of the hole to be drilled and the thickness of the wall. The attachment / detachment operation has been performed. Also, when drilling a deep hole, the concrete core may be clogged in the center opening of the core bit. To remove this, it is necessary to remove the core bit by removing the concrete bit. As described above, the operation of attaching and detaching the core bit is frequently performed.

As a structure for mounting a core bit, which has been generally used in the past, to a concrete drill, a core bit is formed on the outer peripheral surface of a cylindrical mounting portion formed at the rear end of the core bit, and projects outward in the radial direction. Stops are formed at equal intervals in the circumferential direction. Insert the lock into the chuck of the concrete drill and set the core bit itself at a predetermined angle. 2. Description of the Related Art There is known a mechanism in which a core bit is held by an edge of a chuck portion by being rotated so as to be mounted. (Refer to JP-A No. 11-3099710 (Page 3, Fig. 1 and Fig. 2).) The above-mentioned conventional concrete drill side chuck has an opening for receiving the core bit mounting part. A notch corresponding to the locking portion formed on the core bit is formed on the outer periphery.To mount the core bit on the chuck portion, align the locking portion formed on the core bit with the notch. After determining the position, it is necessary to mount the core bit on the mounting part, rotate the core bit after mounting, and engage the locking part of the core bit with the edge of the chuck part.

In addition, in such a concrete drill, in order to cool the drill bit formed at the tip of the core bit, cooling water is supplied from the hollow inside of the core bit to the periphery of the drill bit. . Therefore, a sealing member for sealing the cooling water is formed between the chuck portion of the concrete drill and the end face of the mounting portion of the core bit. In the above-described conventional mechanism, the locking portion formed on the outer peripheral surface of the mounting portion of the core bit and protruding outward is inserted into the concave portion formed in the chuck portion, and the locking portion of the core bit is checked. It is necessary to rotate the core bit in order to engage with the edge of the part, and at this time, since the seal member formed at the end of the core bit is rotated while being in contact with the seal seat of the chuck part, The sealing surface of the sealing member may be damaged by cutting dust or the like of the concrete. Furthermore, the rotation operation of the core bit becomes heavy due to the frictional resistance of the seal member, and the mounting operation becomes difficult.

Further, in the above-described conventional mounting mechanism of the core bit, since the chuck portion accommodates the locking portion formed by projecting from the outer peripheral surface of the mounting portion of the core bit, the chuck portion has an inner diameter larger than the outer diameter of the locking portion. It is necessary to form a receiving part. As a result, the outer shape of the chuck became large, which hindered the reduction in size and weight of the concrete drill. In addition, when the core bit is rotated and mounted on the chuck, the sealing surface may be damaged by cutting dust of concrete or the frictional resistance of the sealing member may make the rotation operation of the core bit heavy, making the mounting operation difficult. Problem. Disclosure of the invention

The present invention solves the conventional problems described above, and can reduce the outer shape of the chuck portion to which the core bit is mounted, and can easily perform the operation when mounting or removing the core bit. It is an object to provide a core bit attaching / detaching mechanism as described above.

In order to solve the above problem, a core bit attaching / detaching mechanism according to the present invention has a hollow shape in which a piercing blade is formed on a front end side and a cylindrical mounting portion having a sealing member mounted on a rear end surface is formed on the rear end side. A core bit, and a chuck portion formed with a cylindrical member for accommodating a cylindrical mounting portion of the core bit, and an annular groove and an annular flange portion are formed on an outer peripheral surface of the mounting portion of the core bit. In addition, an engagement portion is formed between the end surface of the tubular member of the chuck portion and the end surface of the annular flange portion so as to be engaged with each other, and is engaged with the annular groove of the core bit. Attraction means having a claw member is provided so as to be slidable with respect to the chuck portion, and by engaging the engagement claw member of the attraction means with the annular groove, the rotation locking portions are fitted to each other. The seal is pressed against the cylindrical member And it features.

Further, a longitudinal groove for guiding the engaging claw member formed on the pulling means into the annular groove formed on the outer peripheral surface of the mounting portion of the core bit is connected to the annular groove so that an end face of the mounting portion is formed. And the rotational engagement portions formed on the end surface of the cylindrical member and the end surface of the cylindrical member can be engaged with each other by engaging with the engagement claw members arranged in the annular groove while being formed in the same direction. Alternatively, a rotation restricting member for restricting the rotation position of the core bit and the cylindrical member may be formed in the annular groove.

An object of the present invention is to reduce the outer shape of the chuck portion and to facilitate the operation of attaching or detaching the core bit to / from a concrete drill. A cylindrical member for accommodating the mounting portion of the core bit is provided on the chuck portion, and an attraction means having an engaging claw member for engaging with the annular groove is slidably provided on the chuck portion. The engaging claw member of the attracting means is engaged with the annular groove of the core bit inserted into the cylindrical member. This was achieved by drawing the core bit toward the chuck and attaching the core bit to the chuck. Brief Description of Drawings

FIG. 1 is a vertical sectional side view showing a core bit attaching / detaching mechanism according to an embodiment of the present invention. FIG. 2 is a side view of a concrete dolinole in which the core bit attaching / detaching mechanism of the present invention is implemented.

FIG. 3 is a perspective view of a co-bit that constitutes the co-bit attachment / detachment mechanism of the present invention.

FIG. 4 is a perspective view of a chuck portion constituting the core bit attaching / detaching mechanism of the present invention.

FIG. 5 is a perspective view in which the center of the state in which the core bit is mounted on the chuck portion is cross-sectional.

FIG. 6 is the same perspective view as FIG. 5 in a state where the attracted state of the core bit is released.

FIG. 7 is a perspective cross-sectional view showing a state in which the core bit is rotated to align the engaging claw member with the vertical groove.

FIG. 8 is a perspective cross-sectional view of a state in which a core bit is rotated so that an engagement protrusion of a flange and an engagement recess of a tubular member are aligned. In addition, the code | symbol in a figure, 1 is a concrete drill, 2 is a chuck | zipper part, 10 is a core bit, 13 is a mounting part, 14 is an annular collar part, 16 is a rotation locking part (1st rotation locking part). , 17 is an annular groove, 20 is a cylindrical member, 21 is a rotation locking portion (second rotation locking portion), 23 is a pulling means (pulling member), and 24 is an engagement claw. The components and and 25 are pull-on sleeves. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 2 shows a concrete structure of a core bit attaching / detaching mechanism according to an embodiment of the present invention. It is a 1-port drill. The concrete drill 1 has a core bit 10 attached to a chuck 2 formed at the front end of the main body, and a grip 3 formed at the rear end and a sub-drip formed at the center of the main body. It is configured to perform the drilling operation by holding the 4 with both hands. By operating the trigger 5 formed in the vicinity of the drip 3, the motor 6 housed in the body of the concrete drill 1 is driven to rotate, and the chuck 2 is rotated and attached to the chuck 2. The core bit 10 is rotated, and the core bit 10 is pierced into a concrete or the like by the piercing blade 11 formed at the tip of the core bit 10.

As shown in FIGS. 1 and 3, the core bit 10 is formed with a drilling blade 11 at the distal end edge of a hollow cylindrical drill portion 12. At the rear end side of the drill portion 12, a mounting portion 13 for mounting the core bit 10 to the chuck portion 2 of the concrete drill is formed. The drill portion 12 is formed in a shape different in outer diameter and length in accordance with the diameter of the hole to be drilled and the depth of the hole. Further, the mounting portion 13 is formed with an annular flange portion 14 having an outer diameter larger than the outer diameter of the mounting portion 13. A hollow cylindrical guide part 15 is formed at a rear end side of the mounting part 13 from the annular collar part 14. The cylindrical guide part 15 is accommodated in a recess formed in the chuck part 2 of the concrete drill 1 so that the rotation axis of the concrete drill 1 and the center axis of the core bit 10 coincide. Will be guided to.

On the rear end surface of the annular annular flange 14 formed on the mounting portion 13, a first convex portion formed of a plurality of convex portions formed at intervals in the circumferential direction of the annular flange 14. The rotation locking part 16 is provided. When the first rotation locking portion 16 engages with the second rotation locking portion 21 formed on the chuck portion 2 side of the concrete drill 1, the rotation of the concrete drill 1 allows the core bit 10 to rotate. Is transmitted to An annular groove 17 is formed on the outer peripheral surface of the guide portion 15 so as to be continuous in all circumferential directions. Continuing with the annular groove 17, a plurality of vertical grooves 18 extending along the axial direction of the core bit 10 are formed at intervals in the circumferential direction toward the end of the cylindrical guide 15. (Toward the rear end).

Further, a cooling device for cooling the portion of the drill bit 11 of the core bit 10 during drilling. Recirculated water is supplied from the main body of the concrete bin 1 through the center opening of the core bin 10 to the tip of the core bin 10. For this reason, on the end face of the guide part 15 of the mounting part 13 of the core bit 10, a sealing member 19 for sealingly connecting the concrete bite 1 to the core bit 10 so as to prevent cooling water from leaking is mounted. ing.

As shown in FIGS. 1 and 4, the chuck 2 formed on the side of the concrete drill 1 has a cylindrical member 2 having a housing for housing the cylindrical guide 15 of the core bit 10. 0 is provided. The cylindrical member 20 is linked with a rotation mechanism formed in the concrete drill 1, and a rotational force is transmitted to the core bit via the cylindrical member 20. For this reason, on the front end face of the cylindrical member 20, a second rotation locking portion 2 engageable with the first rotation locking portion 16 formed on the annular flange portion 14 of the core bit 10. 1 is formed. The second rotation locking portion is composed of a plurality of recesses formed at intervals in the circumferential direction. The convex portion provided in the first rotation locking portion 16 and projecting in the direction of the cylindrical member 20 is accommodated in the concave shape provided in the second rotation locking portion 21. For this reason, when the core bit 10 is attached to the chuck portion 2, the first rotation locking portion 16 and the second rotation locking portion 21 are fitted to each other, and the rotation of the concrete drill 1 side is changed to the core bit. It is transmitted to the 10 side.

Further, the inner surface of the cylindrical member 20 is engaged with a seal member 19 disposed on an end surface of the core bit 10 to join the cylindrical member 20 and the core bit 10 side in a sealed state. The seal seat 22 to be formed is formed. When the core bit 10 is attached to the chuck part 2, the hollow inside the core bit 10 and the inside of the cylindrical member 20 are connected so that the cooling water can be supplied from the concrete drain 1 side into the hollow part of the core bit 10. The cooling water is supplied around the perforated blade 11 at the tip of the core bit 10 and consequently cools the perforated blade 11 and at the same time the cutting generated by the perforated blade 11 Acts to discharge the powder.

Further, the chuck part 2 attracts the core bit 10 mounted in the cylindrical member 20 of the chuck part 2 to the chuck part 2 side, and attracts the core bit 10 to the chuck part 2 (attraction means ( Attraction member) 23 is provided. The attracting means (attracting member) 23 is provided with an engaging member capable of engaging with the annular groove 17 of the core bit 10. The dovetail member 24 is formed by an attraction sleep 25 formed on the inner peripheral surface. The three engaging claw members 24 arranged at equal intervals in the circumferential direction engage with the annular groove 17 to attract and hold the core bit 10 in the direction of the concrete drill 1 main body. By the attraction and holding of the core bit 10 by the pulling sleeve 25, the first rotation locking portion 16 formed between the annular flange portion 14 of the core bit 10 and the end surface of the cylindrical member 20 and the second rotation locking portion 16 are formed. The rotation locking portion 21 is maintained in a fitted state, and the seal member 19 formed in the core bit 10 is maintained in a state of being pressed against a seal seat 22 formed in the cylindrical member 20. .

The pulling sleeve 25 is disposed on the outer peripheral side of the tubular member 20, and the tip of the engaging claw member 24 formed on the inner peripheral surface of the pulling sleeve 25 is The cylindrical member 20 advances from the opening 26 formed in the outer peripheral surface of the cylindrical member 20 to the inside of the cylindrical member 20. The distal end of the engaging claw member 24 can engage with an annular groove 17 formed on the outer peripheral surface of the guide portion 15 of the core bit 10 inserted into the cylindrical member 20. The engaging claw member 24 formed on the drawing sleeve 25 and the longitudinal groove 18 formed in the direction of the end face of the guide portion 15 continuously from the annular groove 17 of the core bit 10 are: They are arranged to correspond to each other. Therefore, the core bit 10 is rotated and positioned so that the longitudinal groove 18 of the core bit 10 coincides with the engaging claw member 24, and the core bit 10 is inserted into the cylindrical member 20. Then, the engaging claw member 24 enters the annular groove 17. Thereafter, by rotating the core bit 10, the engaging claw member 24 is engaged with the annular groove 17.

The pulling sleeve 25 is configured to be slid along the axial direction of the core bit 10 by an operation of tilting and raising the lock lever 7 formed on the concrete drill 1 main body. As shown in FIG. 2, when the lock lever 7 is operated to the inclined position, the pulling sleeve 25 slides toward the concrete drill 1 main body. Then, as shown in FIG. 5, the engaging claw member 24 is engaged with the annular groove 17 of the core bit 10, and the core bit 10 is pulled toward the chuck portion 2, and as a result, the mounted state is changed. Will be maintained. By moving the lock lever 7 to the upright position, as shown in FIG. It slides toward the leading end of 0. For this reason, the annular groove 17 is pressed forward by the distal end portion of the engaging claw member 24, and the core bit 10 is pushed forward, and as a result, the above-described attracted mounting state is released.

As shown in FIG. 3, in the annular groove 17 formed on the outer peripheral surface of the guide portion 15 of the core bit 10, the side surface of the engaging claw member 24 that has entered the annular groove 17 is brought into contact. An engagement protrusion 27 is formed as a rotation restricting member that can be rotated. The engagement protrusion 27 is formed continuously with the engagement claw member 24 and the annular groove 17 in a state where the engagement protrusion 27 contacts the side surface of the engagement claw member 24. It is formed at a position where it is aligned with the vertical groove 18. As shown in FIG. 7, in a state where the core bit 10 is mounted on the cylindrical member 20 內 of the chuck portion 2, the engagement protrusion 27 is engaged by rotating the core bit 10 in the direction shown by the arrow in the figure. When the rotation is stopped by contacting the side surface of the dovetail member 24, the engagement claw member 24 and the longitudinal groove 18 continuous with the annular groove 17 are aligned. As a result, the engaging claw member 24 engaged in the annular groove 17 of the core bit 10 is deviated from the annular groove 17 via the longitudinal groove 18 to chuck the core bit 10. Operation to escape from part 2 can be performed easily.

As shown in FIG. 3, the annular groove 17 has an engagement protrusion as a rotation restricting member that can abut against the side surface on the opposite side of the engagement claw member 24 that has entered the annular groove 17. A part 28 is formed. As shown in FIG. 8, by rotating the core bit 10 inserted in the cylindrical member 20 in the direction of the arrow, the engaging projection 28 engages with the side surface of the engaging claw member 24 and rotates. Is prevented. In this position, the rotation locking part 16 formed on the annular collar part 14 of the core bit 10 and the rotation locking part 21 formed on the end face of the cylindrical member 20 of the chuck part 2 can be fitted together. It is arranged at a proper alignment position. Therefore, by rotating the core bit 10 to this position and then tilting the hook lever 7, the rotation locking portion 16 and the rotation locking portion 21 are engaged, and the chuck of the core bit 10 is chucked. Mounting to the part 2 can be performed easily. Further, at this time, the sealing member 19 formed at the end of the core bit 10 is press-bonded to the sealing seat of the cylindrical member 20 by 22. As a result, a hermetic seal is formed.

The engaging projection 28 is formed from the front side wall surface forming the inside of the annular groove 17. It is formed so as to protrude toward the rear side wall surface. For this reason, when the lock lever 7 is raised and the pulling sleeve 25 is operating in the direction of pushing the core bit 10 forward, the engaging projection 28 engages with the engaging claw member 24. restricting the rotation of the core bit 1 0 Te, while the lock lever 7 to the attracting sleep ^{2 5} and the tilting operation is actuated to concrete Todoriru one direction engagement claw portion 2 4 core bit 1 0 annular groove 1 7 When the core bit 10 is pulled toward the chuck portion 2 by engaging with the engaging portion 24, the engaging claw member 24 does not engage with the engaging convex portion 28. As a result, the rotational driving force transmitted from the concrete drill 1 to the core bit 10 does not cause an external force in the rotational direction to act on the engaging projection 28 and the engaging claw member 24.

When the lock lever 7 is raised, the core bit 10 inserted and inserted into the cylindrical member 20 of the chuck portion 2 is attached to the first rotation locking portion 1 formed on the annular flange portion 14 of the core bit 10. It is necessary to rotate the core bit 10 with respect to the chuck portion 2 in order to make the 6 and the second rotation locking portion 21 formed on the front end face of the cylindrical member 20 coincide with each other. At times, the core bit 10 is disposed at a position pushed forward by the engaging claw member 24 of the attraction sleep 25. For this reason, at this position, since the seal member 19 is arranged at a distance from the seal seat 22, as a result, the seal member 19 is exposed to dust and the like adhered to the seal member 19 and the seal seat 22. Damage to the sealing surface of 19 is prevented. Further, since the seal member 19 does not contact the seal seat 22 when the core bit 10 is rotated, as a result, the rotation operation can be performed lightly and the detachment operation of the core bit 10 can be facilitated.

Industrial applicability

According to the present invention, an annular groove is formed on the outer peripheral surface of the mounting portion of the core bit, and an attraction means that forms an engaging claw member that engages with the annular groove of the core bit is slidably provided on the chuck portion, The core bit is mounted on the chuck by engaging the engaging claw member of the attracting means with the annular groove. Since the annular flange formed on the core bit mounting part is not accommodated in the chuck part, the outer shape of the chuck part The shape can be made small, and the size and weight of the tool can be reduced.

In addition, an annular flange is formed on the outer peripheral surface of the mounting portion of the core bit, and the rotating members fitted to each other between the end surface of the tubular member accommodating the mounting portion of the core bit and the end surface of the annular flange portion. A stop portion is formed, and when the core bit is pulled to the chuck portion by the pulling means, the rotation locking portions are fitted to each other, and the seal portion formed at the end of the core bit is pressed against the cylindrical member. I have. Therefore, before the attraction means is slid, the core bit is pushed forward by the attraction means, and the seal member is placed away from the seal seat. As a result, it is possible to prevent dust or the like adhering to the seal member or the seal seat from damaging the seal surface of the seal member. Further, since the seal member is not in contact with the seal seat when the core bit is rotated, the rotation operation can be performed lightly and the detachment operation of the core bit can be facilitated.

In addition, a longitudinal groove extending in the direction of the end face of the mounting portion so as to be continuous with the annular groove is formed on the outer peripheral surface of the mounting portion of the core bit, and the engaging claw member formed on the attraction means is inserted into the annular groove. In addition to facilitating the guidance, by engaging with the engaging claw member arranged in the annular groove, a position where the end faces of the annular flange and the end faces of the tubular member can be engaged with each other. A rotation restricting member for restricting the rotational position of the core bit and the cylindrical member is formed in the annular groove. For this reason, when mounting the core bit to the chuck portion, the positioning for fitting the rotation locking portions can be easily performed, and the mounting operation of the core bit to the concrete drill can be easily performed.

Claims

The scope of the claims

1. a hollow core bit having a piercing blade provided at a front end portion and a cylindrical mounting portion provided at a rear end portion;

A chuck member having a tubular member capable of accommodating the mounting portion; an annular groove formed on an outer peripheral surface of the mounting portion;

An annular collar portion formed on the outer peripheral surface of the mounting portion;

A first rotation locking portion formed on an end surface of the annular flange portion,

A second rotation locking portion formed on an end surface of the cylindrical member,

A pulling member having an engaging claw member capable of engaging with the annular groove, the pulling member being slidably provided on the cylindrical member;

With

By engaging the engagement claw member with the annular groove, the first rotation locking portion and the second rotation locking portion are fitted to each other.

Core bit attachment / detachment mechanism.

2. The core bit attaching / detaching mechanism according to claim 1, wherein the chuck portion is provided on a concrete drill body.

3. Furthermore,

A longitudinal groove formed in the end face direction of the mounting portion so as to be continuous with the annular groove, and for guiding the engaging claw member into the annular groove;

By engaging with the engagement member formed in the annular groove and disposed in the annular groove, the first rotation locking portion and the second rotation locking portion are mutually connected. A rotation restricting member for restricting the rotation position of the co-bit and the cylindrical member to a positional relationship where they can be fitted;

The core bit attaching / detaching mechanism according to claim 1, comprising:

4. The first rotation locking portion has a plurality of convex portions formed on a rear end side surface of the annular flange portion at intervals in a circumferential direction,

The second rotation locking portion has a plurality of recesses formed on the front end side surface of the cylindrical member at circumferentially spaced intervals.

2. The core bit attaching / detaching mechanism according to claim 1, wherein the plurality of protrusions and the plurality of recesses respectively fit with each other.

5. The tubular member has an opening,

2. The core bit attachment / detachment structure according to claim 1, wherein a distal end portion of the engagement claw member extends inside the tubular member.

2