DIAMETRICALLY EXPANDED GROOVE CUTTING APPARATUS AND EXPANDABLE MECHANISM
To provide a diametrically expanded groove cutting apparatus capable of simultaneously cutting a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein, and to provide an expandable mechanism used in the diametrically expanded groove cutting apparatus. A diametrically expanded groove cutting apparatus comprising: a main body portion including a shank to be coupled to an electrical device; an intermediate expandable mechanism and a tip end side expandable mechanism disposed along an axial direction so as not to rotate with respect to the main body portion, the electrical device applying an axial rotation to the diametrically expanded groove cutting apparatus to cause the diametrically expanded groove cutting apparatus to be able to cut upper and lower diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by using cutting blades disposed on the expandable mechanisms and, wherein: the diametrically expanded groove cutting apparatus is extensible; and the cutting blades diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus.
The present invention relates to a diametrically expanded groove cutting apparatus capable of cutting a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein, and an expandable mechanism used in the diametrically expanded groove cutting apparatus.
BACKGROUND ARTOne example of a conventional diametrically expanded groove cutting apparatus will be explained with reference to
In the case of cutting the diametrically expanded annular groove 3 on the inner peripheral wall of the anchor prepared hole 2 using the diametrically expanded groove cutting apparatus 1, first, as shown in
Next, as shown in
In a case where the diametrically expanded groove cutting apparatus 1 rotates in a state in which the cutting blades 8 diametrically expand, one diametrically expanded annular groove 3 can be cut on the inner peripheral wall of the anchor prepared hole 2 by the diametrically expanded cutting blades 8 (see
In a state in which the impact is not applied to the bottom of the anchor prepared hole 2 by the electrical device or the pressing force is not applied by the operator, the pair of flexible portions 5b move upward by the spring force of the compression spring 6, and the flexible portions 5b deform such that the cutting blades (slide portions 5c) 8 diametrically contract. Therefore, the diametrically expanded groove cutting apparatus 1 can be pulled out from the anchor hole 9.
Patent Document 1: Japanese Utility Model Application Publication No. Hei. 3-29590
DISCLOSURE OF THE INVENTION Problems to be Solved by the InventionHowever, the problem of the conventional diametrically expanded groove cutting apparatus 1 shown in
A method for cutting two diametrically expanded annular grooves 3 on the inner peripheral wall of the anchor prepared hole 2 using the conventional diametrically expanded groove cutting apparatus 1 is, for example, as follows. First, a comparatively shallow first anchor prepared hole is cut using the prepared hole drill. Then, as shown in
However, the problem of this method is that cutting the first and second diametrically expanded annular grooves 3 in this manner takes time and trouble.
The present invention was made to solve the above problems, and an object of the present invention is to provide a diametrically expanded groove cutting apparatus which can simultaneously cut a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein and which can be easily pulled out from the anchor hole with less time if the diametrically expanded groove cutting apparatus remains diametrically expanded and does not diametrically contract due to, for example, cutting powder, and to provide an expandable mechanism used in the diametrically expanded groove cutting apparatus.
Means for Solving the ProblemsA diametrically expanded groove cutting apparatus according to the present invention includes: a main body portion including a shank to be coupled to a driving portion; and a plurality of expandable mechanisms disposed along an axial direction so as not to rotate with respect to the main body portion, the driving portion applying an axial rotation to the diametrically expanded groove cutting apparatus to cause the diametrically expanded groove cutting apparatus to be able to cut a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by using cutting blades disposed on the expandable mechanisms, wherein: the diametrically expanded groove cutting apparatus is extensible; and the cutting blades diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus.
In the case of cutting the diametrically expanded annular groove on the inner peripheral wall of the anchor prepared hole using the diametrically expanded groove cutting apparatus according to the present invention, for example, first, the anchor prepared hole is cut on a concrete floor surface using a prepared hole drill. Then, the shank formed on an upper end of the diametrically expanded groove cutting apparatus is attached to a chuck of a rotation vibration driving portion, the plurality of expandable mechanisms are inserted into the anchor prepared hole, and the tip end portion of the diametrically expanded groove cutting apparatus is pressed against the bottom of the anchor prepared hole. Next, an operator drives the driving portion. Then, the diametrically expanded groove cutting apparatus rotates in a predetermined direction and is applied with vibration for applying impact on the bottom of the anchor prepared hole. By the impact with respect to the bottom of the anchor prepared hole and the pressing force by the operator, the diametrically expanded groove cutting apparatus retracts. By this retraction, the cutting blades disposed on the expandable mechanisms become the diametrically expanded state. In a case where the cutting blades rotate in the diametrically expanded state, a plurality of diametrically expanded annular grooves can be cut on the inner peripheral wall of the anchor prepared hole by the diametrically expanded cutting blades. The anchor bar can be planted in the anchor hole by inserting the anchor bar into the anchor hole, filling the anchor hole with a bonding material and hardening the bonding material. In a case where the impact with respect to the bottom of the anchor prepared hole and the pressing force are not applied, the cutting blades move upward so as to diametrically contract. Therefore, the diametrically expanded groove cutting apparatus can be pulled out from the anchor hole.
In the diametrically expanded groove cutting apparatus according to the present invention, among the plurality of expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion may be removably attached to the tip end side expandable mechanism, the main body portion and the other intermediate expandable mechanism, and the intermediate expandable mechanism may include a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion. In accordance with the diametrically expanded groove cutting apparatus, in the case of cutting two diametrically expanded annular grooves on the inner peripheral wall of the anchor prepared hole for example, the main body portion, one intermediate expandable mechanism and the tip end side expandable mechanism may be coupled to one another. In the case of cutting three or more (a desired number of) diametrically expanded annular grooves, a required number of the intermediate expandable mechanisms may be coupled to one another based on the number of the diametrically expanded annular grooves to be cut. Note that the tip end side expandable mechanism and the intermediate expandable mechanism can be fixedly attached to the main body portion by the stiff portion.
Further, in the diametrically expanded groove cutting apparatus according to the present invention, the tip end side expandable mechanism may be removably attached to the main body portion. With this, the tip end side expandable mechanism can be directly attached to the main body portion without attaching the intermediate expandable mechanism to the main body portion. Therefore, using this diametrically expanded groove cutting apparatus, one diametrically expanded annular groove can be cut on the inner peripheral wall of the anchor prepared hole. Thus, it is possible to provide a diametrically expanded groove cutting apparatus capable of cutting one or a plurality of (a required number of) diametrically expanded annular grooves on the inner peripheral wall of the anchor prepared hole by directly attaching the tip end side expandable mechanism to the main body portion or by coupling a required number of the intermediate expandable mechanisms.
In the diametrically expanded groove cutting apparatus according to the present invention, each of the expandable mechanisms may include a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property; an expandable guiding portion may be formed at a tip end portion of the core body; the flexible portion may include at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and the cutting blade may be disposed on the slide portion. In the case of cutting a plurality of diametrically expanded annular grooves on the inner peripheral wall of the anchor prepared hole using the diametrically expanded groove cutting apparatus, a plurality of expandable mechanisms are inserted into the anchor prepared hole, and the core body at the tip end of the diametrically expanded groove cutting apparatus is pressed against the bottom of the anchor prepared hole. Next, the operator drives the driving portion, and the driving portion applies the rotations and the impact vibrations with respect to the diametrically expanded groove cutting apparatus. Then, the slide portions of the flexible portions are guided by the expandable guiding portions of the core bodies, and diametrically expand while moving downward (here, the core body retracts). Thus, the cutting blades disposed on the slide portions diametrically expand. A plurality of diametrically expanded annular grooves can be cut simultaneously by the diametrically expanded cutting blades.
In a case where the driving portion is stopped, or the pressing force by the operator with respect to the diametrically expanded groove cutting apparatus decreases, the pressing force of the core body at the tip end of the diametrically expanded groove cutting apparatus with respect to the bottom of the anchor prepared hole decreases, and the core bodies are biased by biasing means and extend. In a case where the core bodies move in the extending direction, the slide portions of the flexible portions are guided by the expandable guiding portions and diametrically contract while moving upward. Thus, the cutting blades disposed on the slide portions diametrically contract. Therefore, a plurality of expandable mechanisms can be pulled out from the anchor hole with the cutting blades diametrically contracted.
Moreover, an expandable mechanism according to the present invention is an expandable mechanism used in a diametrically expanded groove cutting apparatus capable of cutting a diametrically expanded annular groove on an inner peripheral wall of a preformed anchor prepared hole, wherein: the expandable mechanism is able to be detachably coupled to a main body portion included in the diametrically expanded groove cutting apparatus and the other expandable mechanism; the expandable mechanism includes a core body which is coupled so as to be movable with respect to the main body portion in an axial direction within a predetermined range, and a flexible portion having an elastic property; an expandable guiding portion is formed at a tip end portion of the core body; the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and a cutting blade is disposed on the slide portion.
Since the expandable mechanism according to the present invention functions in the same manner as the expandable mechanism according to claim 4, an explanation thereof is omitted.
Further, the diametrically expanded groove cutting apparatus according to the present invention is a diametrically expanded groove cutting apparatus comprising: a main body portion including a shank to be coupled to a driving portion; and an expandable mechanism disposed so as not to rotate with respect to the main body portion, the diametrically expanded groove cutting apparatus being able to cut a diametrically expanded annular groove on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by causing a cutting blade formed on the expandable mechanism to rotate by applying an axial rotation to the main body portion using the driving portion, wherein: the expandable mechanism includes a core body; the core body is disposed so as to be extensible with respect to the main body portion; the cutting blade diametrically expands or contracts by a retracting operation or an extending operation of the core body; the main body portion includes a cotter hole or a cotter groove; and the cotter hole or the cotter groove is able to cause the core body to move with respect to the main body portion in an extending direction by a cotter hit into the cotter hole or the cotter groove.
In the case of cutting the diametrically expanded annular groove on the inner peripheral wall of the anchor prepared hole using the diametrically expanded groove cutting apparatus according to the present invention, for example, first, the anchor prepared hole is cut on the concrete floor surface using the prepared hole drill. Then, the shank formed on the upper end of the diametrically expanded groove cutting apparatus is attached to the chuck of the rotation vibration driving portion, the expandable mechanism is inserted into the anchor prepared hole, and the tip end portion (tip end portion of the core body) is pressed against the bottom of the anchor prepared hole. Next, the operator drives the driving portion. Then, the diametrically expanded groove cutting apparatus rotates in a predetermined direction and is applied with vibration for applying impact on the bottom of the anchor prepared hole. By the impact with respect to the bottom of the anchor prepared hole and the pressing force by the operator, the diametrically expanded groove cutting apparatus retracts. By this retraction, the cutting blades become the diametrically expanded state. In a case where the cutting blades rotate in the diametrically expanded state, the diametrically expanded annular groove can be cut on the inner peripheral wall of the anchor prepared hole by the diametrically expanded cutting blades. The anchor bar can be planted in the cut anchor hole in the same manner as before. Since the cutting blades move upward so as to diametrically contract in a state in which the impact, etc. is not applied to the bottom of the anchor prepared hole, the diametrically expanded groove cutting apparatus can be pulled out from the anchor hole.
In some cases, for example, the diametrically expanded cutting blades do not return to the diametrically contracted state due to clogging of the cutting powder in the expandable mechanism, and the diametrically expanded groove cutting apparatus cannot be pulled out from the anchor hole. In such cases, by hitting the cotter into the cotter hole or the cotter groove, the core body is caused to move with respect to the main body portion in the extending direction. Thus, since it is possible to cause the diametrically expanded cutting blades to diametrically contract, the diametrically expanded groove cutting apparatus can be pulled out from the anchor hole.
The diametrically expanded groove cutting apparatus according to the present invention may further includes: a main body side sleeve and a core body side sleeve disposed so as to be movable with respect to the main body portion in an axial direction; biasing means for biasing the main body side sleeve and the core body side sleeve in such a direction that the main body side sleeve and the core body side sleeve are separated from each other; and a stopper projection which is disposed on the main body portion to stop a movement of the main body side sleeve in such a direction that the main body side sleeve is separated from the core body side sleeve, wherein in a state in which the core body side sleeve is coupled to the core body, and the main body side sleeve and the core body side sleeve are in contact with each other, part of the cotter hole or the cotter groove may be covered by the main body side sleeve. With this, it is possible to cause the main body side sleeve and the core body side sleeve to be separated from each other by biasing means. Here, since the main body side sleeve engages with the stopper projection, the core body side sleeve and the core body coupled thereto can be biased with respect to the main body portion in the extending direction. In a case where the core body extends as above, the cutting blades diametrically contract. Next, in a case where the core body is caused to retract against the biasing force of the biasing means, the cutting blades diametrically expand. Even if the main body side sleeve and the core body side sleeve are caused to contact each other with the cutting blades diametrically expanded, part of the cotter hole or the like is covered by the main body side sleeve, and the rest of the cotter hole or the like opens outside. Therefore, by hitting the cotter into the opening of the cotter hole or the like, it is possible to cause the core body to extend, and to forcibly cause the diametrically expanded cutting blades to diametrically contract.
In the diametrically expanded groove cutting apparatus according to the present invention, a plurality of the expandable mechanisms may be included; among the plurality of the expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion may be removably attached to the tip end side expandable mechanism and the main body portion; the intermediate expandable mechanism may include a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion; and the tip end side expandable mechanism may be removably attached to the main body portion. In accordance with the diametrically expanded groove cutting apparatus, for example, in the case of cutting two diametrically expanded annular grooves on the inner peripheral wall of the anchor prepared hole, the main body portion, one intermediate expandable mechanism and the tip end side expandable mechanism may be coupled to each other. In the case of cutting one diametrically expanded annular groove, the tip end side expandable mechanism may be directly coupled to the main body portion without coupling the intermediate expandable mechanism to the main body portion. Note that the tip end side expandable mechanism and the intermediate expandable mechanism can be fixedly attached to the main body portion by the stiff portion.
Further, in the diametrically expanded groove cutting apparatus according to the present invention, the intermediate expandable mechanism may be removably attached to the other intermediate expandable mechanism. In the case of cutting three or more (a desired number of) diametrically expanded annular grooves on the inner peripheral wall of the anchor prepared hole using the diametrically expanded groove cutting apparatus, a required number of the intermediate expandable mechanisms may be coupled to one another based on the number of the diametrically expanded annular grooves to be cut. Thus, a plurality of (a required number of) diametrically expanded annular grooves can be cut.
In the diametrically expanded groove cutting apparatus according to the present invention, the expandable mechanism may include the core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in the extending direction by the biasing means, and a flexible portion having an elastic property; an expandable guiding portion may be formed at a tip end portion of the core body; the flexible portion may include at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and the cutting blade may be disposed on the slide portion. In the case of cutting the diametrically expanded annular groove on the inner peripheral wall of the anchor prepared hole using the diametrically expanded groove cutting apparatus, the expandable mechanism is inserted into the anchor prepared hole, and the core body at the tip end of the diametrically expanded groove cutting apparatus is pressed against the bottom of the anchor prepared hole. Next, the operator drives the driving portion, and the driving portion applies the rotations and the impact vibrations with respect to the diametrically expanded groove cutting apparatus. Then, the slide portion of the flexible portion is guided by the expandable guiding portion disposed on the core body, and diametrically expands while moving downward (here, the core body retracts). Thus, the cutting blade disposed on the slide portion diametrically expands. The diametrically expanded annular groove can be cut by the diametrically expanded cutting blade.
In a case where the driving portion is stopped, or the pressing force by the operator with respect to the diametrically expanded groove cutting apparatus decreases, the pressing force of the core body at the tip end of the diametrically expanded groove cutting apparatus with respect to the bottom of the anchor prepared hole decreases, and the core body is biased by the biasing means and extends. In a case where the core body moves in the extending direction, the slide portion of the flexible portion is guided by the expandable guiding portion and diametrically contracts while moving upward. Thus, the cutting blade disposed on the slide portion diametrically contracts. Therefore, the expandable mechanism can be pulled out from the anchor hole with the cutting blade diametrically contracted.
EFFECTS OF THE INVENTIONThe diametrically expanded groove cutting apparatus according to the present invention is configured such that a plurality of expandable mechanisms are disposed along an axial direction, and cutting blades disposed on respective expandable mechanisms diametrically expand by a retracting operation of the diametrically expanded groove cutting apparatus. Therefore, by rotating the diametrically expanded groove cutting apparatus in this diametrically expanded state, a plurality of diametrically expanded annular grooves can be simultaneously cut on the inner peripheral wall of the anchor prepared hole. On this account, it is possible to cut an anchor hole by which the high resistance to the pull-out force can be obtained easily with less trouble and time than before.
Further, the diametrically expanded groove cutting apparatus according to the present invention is configured such that the diametrically expanded cutting blades can be diametrically contracted forcibly by hitting a cotter into a cotter hole or a cotter groove. Therefore, in a case where the diametrically expanded groove cutting apparatus cannot be pulled out from the anchor hole since the diametrically expanded cutting blades do not diametrically contract due to clogging of, for example, cutting powder in the expandable mechanism, it is possible to extremely easily and forcibly contract the diametrically expanded cutting blades with less time by hitting the cotter into the cotter hole or the like. Therefore, the diametrically expanded groove cutting apparatus can be easily pulled out from the anchor hole.
-
- 2 anchor prepared hole
- 3 diametrically expanded annular groove
- 4 floor surface
- 8 cutting blade
- 11, 111 diametrically expanded groove cutting apparatus
- 12 main body portion
- 12a shank
- 12b attaching portion
- 12c externally threaded portion
- 13 intermediate expandable mechanism
- 14 tip end side expandable mechanism
- 15 biasing mechanism
- 16 insertion hole
- 17 core body
- 17a, 24a base end portion
- 17b, 17c, 20a, 27b coupling hole
- 18, 33 coupling pin
- 19 elongate hole
- 20 core body
- 21 flexible portion
- 22 engaging concave portion
- 23 engaging convex portion
- 24, 36 exterior portion
- 25, 125 main body side sleeve
- 25a internally threaded portion
- 26 compression spring
- 27 core body side sleeve
- 27a tubular upper portion
- 28 expandable guiding portion
- 28a bottom surface
- 29 stiff portion
- 30 slide portion
- 30a inclined surface
- 31 projection
- 32 fitting hole
- 34 pin cover
- 37 step portion
- 38 guide head
- 38a groove
- 39 prepared hole drill
- 40 cutting powder
- 41 anchor hole
- 42 anchor bar
- 43 bonding material
Hereinafter, Embodiment 1 of a diametrically expanded groove cutting apparatus and an expandable mechanism used therein according to the present invention will be explained with reference to
The diametrically expanded groove cutting apparatus 11 shown in
As shown in
As shown in
As shown in
To be specific, as shown in
Moreover, as shown in
Further, as shown in
As shown in
As shown in
As shown in
The flexible portion 21 is formed by, for example, a plate-shaped metal having an elastic property, and is formed with a slide portion 30 at a lower end thereof. The slide portion 30 has the cutting blade 8 of a tip shape, and an edge portion of the cutting blade 8 project from an outer surface and lower end surface of the slide portion 30. An inner surface of the slide portion 30 which surface faces the core body 17 is formed as an inclined surface 30a so as to be inclined outward as it extends downward.
The stiff portion 29 has a substantially semicircular shape in cross section and is formed so as to be longer than the flexible portion 21. As shown in
Moreover, as shown in
As shown in
Moreover, as shown in
As shown in
Differences between the tip end side expandable mechanism 14 shown in
To be specific, the exterior portion 24 of the intermediate expandable mechanism 13 shown in
In the core body 17 of the intermediate expandable mechanism 13 shown in
As shown in
Next, a procedure of cutting two diametrically expanded annular grooves 3 on the inner peripheral wall of the anchor prepared hole 2 using the diametrically expanded groove cutting apparatus 11 shown in
When the core bodies 17 and 20 move in a direction in which they are pushed upward (direction in which the exterior portions 24 and 36 are pushed downward), the slide portions 30 of the flexible portions 21 of the tip end side expandable mechanism 14 and the intermediate expandable mechanism 13 are guided by the expandable guiding portions 28 of the corresponding core bodies 17 and 20, so that the slide portions 30 diametrically expand. With this, the upper and lower cutting blades 8 of the tip end side expandable mechanism 14 and the intermediate expandable mechanism 13 become the diametrically expanded state. Since the upper and lower cutting blades 8 in the diametrically expanded state can rotate, two diametrically expanded annular grooves 3 can be cut on upper and lower portions of the inner peripheral wall of the anchor prepared hole 2 by the diametrically expanded cutting blades 8.
If the electrical device is stopped or the pressing force of the operator with respect to the diametrically expanded groove cutting apparatus 11 decreases, the pressing force of the tip end guide head 38 of the diametrically expanded groove cutting apparatus 11 with respect to the bottom of the anchor prepared hole 2 decreases, and the core bodies 17 and 20 are biased by the compression spring 26 so as to extend. In a case where the core bodies 17 and 20 move in the extending direction (downward direction), the slide portions 30 disposed on the flexible portions 21 of the tip end side expandable mechanism 14 and the intermediate expandable mechanism 13 are guided by the expandable guiding portions 28 and diametrically contract while moving upward. With this, the cutting blades 8 disposed on the slide portions 30 diametrically contract. With the cutting blades 8 diametrically contracted, the tip end side expandable mechanism 14 and the intermediate expandable mechanism 13 can be pulled out from an anchor hole 41.
Next, as shown in
As described above, the intermediate expandable mechanism 13 of the diametrically expanded groove cutting apparatus 11 shown in
Further, by changing, for example, the length of the attaching portion 12b of the main body portion 12 and the positions of the coupling holes 17b of the core bodies 17 and 20 and the exterior portions 24 and 36, the tip end side expandable mechanism 14 of the diametrically expanded groove cutting apparatus 11 shown in
Moreover, since the intermediate expandable mechanism shown in
In a case where the diameter of the intermediate expandable mechanism 13 is comparatively made large, the cross-sectional area of the stiff portion 29 can be made large. Therefore, the intermediate expandable mechanism 13 can obtain a required strength. As a result, it is possible to provide the intermediate expandable mechanism configured to include a plurality of the flexible portions 21.
Further, as shown in
In Embodiment 1, the main body portion 12, the exterior portion 24 of the intermediate expandable mechanism 13 and the exterior portion 36 of the tip end side expandable mechanism 14 shown in
Next, Embodiment 2 of the diametrically expanded groove cutting apparatus according to the present invention will be explained with reference to
To be specific, as shown in
In contrast, as shown in
As shown in
As shown in
As shown in
Note that a procedure of cutting two diametrically expanded annular grooves 3 on the inner peripheral wall of the anchor prepared hole 2 using the diametrically expanded groove cutting apparatus 111 shown in
The following will explain a mechanism and procedure of, in a case where, as shown in
First, as shown in
In the above embodiment, as shown in
As above, the diametrically expanded groove cutting apparatus and the expandable mechanism used therein according to the present invention have an excellent effect of being able to cut a plurality of diametrically expanded annular grooves simultaneously on the inner peripheral wall of the anchor prepared hole for planting the anchor bar therein and an excellent effect of being able to easily pull out from the anchor hole in a short period of time the diametrically expanded groove cutting apparatus which has diametrically expanded and does not diametrically contract by, for example, the cutting powder, and are suitable for being applied to such a diametrically expanded groove cutting apparatus and an expandable mechanism used therein.
Claims
1. A diametrically expanded groove cutting apparatus comprising:
- a main body portion including a shank to be coupled to a driving portion; and
- a plurality of expandable mechanisms disposed along an axial direction so as not to rotate with respect to the main body portion,
- the driving portion applying an axial rotation to the diametrically expanded groove cutting apparatus to cause the diametrically expanded groove cutting apparatus to be able to cut a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by using cutting blades disposed on the expandable mechanisms, wherein:
- the diametrically expanded groove cutting apparatus is extensible; and
- the cutting blades diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus.
2. The diametrically expanded groove cutting apparatus according to claim 1, wherein:
- among the plurality of expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism, the main body portion and the other intermediate expandable mechanism; and
- the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion.
3. The diametrically expanded groove cutting apparatus according to claim 2, wherein the tip end side expandable mechanism is removably attached to the main body portion.
4. The diametrically expanded groove cutting apparatus according to claim 1, wherein:
- each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- the cutting blade is disposed on the slide portion.
5. An expandable mechanism used in a diametrically expanded groove cutting apparatus capable of cutting a diametrically expanded annular groove on an inner peripheral wall of a preformed anchor prepared hole, wherein:
- the expandable mechanism is able to be detachably coupled to a main body portion included in the diametrically expanded groove cutting apparatus and the other expandable mechanism;
- the expandable mechanism includes a core body which is coupled so as to be movable with respect to the main body portion in an axial direction within a predetermined range, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- a cutting blade is disposed on the slide portion.
6. A diametrically expanded groove cutting apparatus comprising:
- a main body portion including a shank to be coupled to a driving portion; and
- an expandable mechanism disposed so as not to rotate with respect to the main body portion,
- the diametrically expanded groove cutting apparatus being able to cut a diametrically expanded annular groove on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein by causing a cutting blade formed on the expandable mechanism to rotate by applying an axial rotation to the main body portion using the driving portion, wherein:
- the expandable mechanism includes a core body;
- the core body is disposed so as to be extensible with respect to the main body portion;
- the cutting blade diametrically expands or contracts by a retracting operation or an extending operation of the core body;
- the main body portion includes a cotter hole or a cotter groove; and
- the cotter hole or the cotter groove is able to cause the core body to move with respect to the main body portion in an extending direction by a cotter hit into the cotter hole or the cotter groove.
7. The diametrically expanded groove cutting apparatus according to claim 6, further comprising:
- a main body side sleeve and a core body side sleeve disposed so as to be movable with respect to the main body portion in an axial direction;
- biasing means for biasing the main body side sleeve and the core body side sleeve in such a direction that the main body side sleeve and the core body side sleeve are separated from each other; and
- a stopper projection which is disposed on the main body portion to stop a movement of the main body side sleeve in such a direction that the main body side sleeve is separated from the core body side sleeve, wherein
- in a state in which the core body side sleeve is coupled to the core body, and the main body side sleeve and the core body side sleeve are in contact with each other, part of the cotter hole or the cotter groove is covered by the main body side sleeve.
8. The diametrically expanded groove cutting apparatus according to claim 6, wherein:
- a plurality of the expandable mechanisms are included;
- among the plurality of the expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism and the main body portion;
- the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion; and
- the tip end side expandable mechanism is removably attached to the main body portion.
9. The diametrically expanded groove cutting apparatus according to claim 8, wherein the intermediate expandable mechanism is removably attached to the other intermediate expandable mechanism.
10. The diametrically expanded groove cutting apparatus according to claim 6, wherein:
- the expandable mechanism includes the core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in the extending direction by the biasing means, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- the cutting blade is disposed on the slide portion.
11. The diametrically expanded groove cutting apparatus according to claim 2, wherein:
- each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- the cutting blade is disposed on the slide portion.
12. The diametrically expanded groove cutting apparatus according to claim 3, wherein:
- each of the expandable mechanisms includes a core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in an extending direction by biasing means, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- the cutting blade is disposed on the slide portion.
13. The diametrically expanded groove cutting apparatus according to claim 7, wherein:
- a plurality of the expandable mechanisms are included;
- among the plurality of the expandable mechanisms, an intermediate expandable mechanism coupled between a tip end side expandable mechanism disposed on a tip end side of the diametrically expanded groove cutting apparatus and the main body portion is removably attached to the tip end side expandable mechanism and the main body portion;
- the intermediate expandable mechanism includes a stiff portion sandwiched between the tip end side expandable mechanism and the main body portion; and
- the tip end side expandable mechanism is removably attached to the main body portion.
14. The diametrically expanded groove cutting apparatus according to claim 7, wherein:
- the expandable mechanism includes the core body which is coupled so as to be movable with respect to the main body portion in the axial direction within a predetermined range and is biased in the extending direction by the biasing means, and a flexible portion having an elastic property;
- an expandable guiding portion is formed at a tip end portion of the core body;
- the flexible portion includes at a tip end portion thereof a slide portion which is guided by the expandable guiding portion so as to diametrically expand or contract; and
- the cutting blade is disposed on the slide portion.
Type: Application
Filed: Nov 13, 2006
Publication Date: Jun 4, 2009
Applicant: Kabushiki Kaisha Myanaga (Hyogo)
Inventor: Masaaki Miyanaga (Miki-shi)
Application Number: 12/092,073
International Classification: E21B 10/32 (20060101); E21B 17/046 (20060101);