JPH078493B2 - Machining member in the inner diameter enlarging and slicing device of the expansion anchor embedded hole - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a cutting member in a device for expanding the diameter of a deep part of an expansion anchor embedded hole formed in a concrete wall surface or the like.

(Prior Art) Conventionally, as this type of abrading device, the following abrading device has been proposed, although it is not yet known. That is, one of them is that the tip portion of the through hole of the tubular main body having the collar portion at the rear end is formed into a tapered hole, and a plurality of split portions extending in the axial direction are formed in the front half portion of the tubular main body. A plurality of elastic legs are formed by providing grooves, and a blade is fixedly projectingly provided on the outer periphery of each elastic leg, and a stopper that limits the insertion length into the prepared hole is fitted to the latter half of the tubular body. A rear end portion of the shank having a conical portion at its tip end that is slidably inserted into the through hole of the tubular body from the rear end thereof and projects from the tubular body. This is a grinding device (Japanese Patent Application No. 63-307199) having a connecting portion for an electric hammer drill at the end portion.
One is a tubular body, a radially expandable tubular bit connected to the tip of the tubular body, and a stopper mounted on the outer periphery of the tubular body so as to be rotatable and axially displaceable. A push rod that is slidably and non-rotatably fitted in the through hole of the tubular body and press-fitted into the tapered hole of the tubular bit. With the stopper inserted in the hole and the stopper abutting the mounting surface to support the tubular body, the push rod is pressed into the tapered hole while rotating to expand the tubular bit. Abrading device (Patent application
1-246181).

(Problems to be Solved by the Invention) According to the above-mentioned respective prior arts, a diameter-expandable cutting member formed at the tip of the device at a predetermined deep portion of the expansion anchor embedding hole drilled in a concrete wall surface or the like. By doing so, it is possible to shave a diameter expansion undercut, but in any case, the shaving member is composed only of a plurality of divided shaving members provided with a blade portion on the outer peripheral surface, and a comparison is made. From the relationship that the expandability is given by the elasticity of each thin dividing member,
When the cutting member is rotated by an electric drill or the like to perform cutting work, the divided cutting members are individually twisted due to cutting resistance, torsional stress, etc. It causes a serious problem.

The present invention was developed with the object of solving the above problems, and despite forming a bit that can be expanded in diameter with a plurality of divided bit pieces having required elasticity, during cutting work, To provide an ablation member in a device for expanding the diameter of a deep part of an expansion anchor embedding hole that can accurately achieve desired expansion cutting without causing twisting deformation of each divided bit piece as described above. To aim.

(Means for Solving the Problem) As a means for solving the above problems and achieving the object, in the present invention, an expansion composed of a plurality of divided bit pieces each provided with a cutting blade on the outer surface of the tip end portion is provided. A bit holder that has a radiusable bit and a split groove of the required length provided vertically on the tip side, and the engaging part of each divided bit piece and the mounting part to the grinding device body are provided on the base end side. And a pushing rod for expanding the diameter of the bit, which is inserted through the bit holder and the bit,
The bit is inserted into the bit holder, and the bit is detachably attached to the bit holder with both side surfaces of each divided bit piece facing the groove wall surface of the dividing groove of the bit holder, and the holder is detached. We have developed and adopted a cutting member for the diameter expansion cutting device for the inner diameter of the expansion anchor embedding hole, which was constructed by detachably attaching to the cutting device body.

Further, according to the present invention, in the shaving member configured as described above, the engaging portion of each divided bit piece is formed by an engaging projection protruding outward, and each engaging projection is formed on the base end side of the bit holding body. A cutting member in a device for expanding the inner diameter of the expansion anchor embedding hole configured by engaging a protruding ridge protruding on the inner peripheral surface and mounting the bit on the bit holding member, and a base of the bit holding member. Expanded anchor embedding hole constructed by mounting the bit holder on the grinding device body by screwing the female screw part provided on the inner peripheral surface of the end with the male screw part provided on the outer peripheral surface of the tip of the grinding device body. We have developed and adopted the cutting members for the inner diameter expansion cutting device.

(Operation) The present invention has the following operation because the cutting member in the apparatus for expanding the inner diameter of the expansion anchor burying hole is configured as described above.

When the bit holder and the rod inserted through the bit are pushed in, each divided bit piece is guided by the groove wall surface of the bit holder so that the divided bit piece is always reliably expanded in a predetermined direction.

In addition, by rotating the shank of the shaving device body by rotating the shank of the shaving device with the diameter increased as described above, when expanding the depth of the inner part of the expansion anchor embedding hole, each divided bit piece Even if it receives a strong cutting resistance, both side surfaces of each divided bit piece are surely supported by the groove wall surface of the bit holder to prevent bending deformation due to torsional stress. There is an accurate action.

(Example) Hereinafter, if an example of the present invention is described based on an accompanying drawing, the cutting member in the inner diameter expansion cutting device of the expansion anchor burial hole concerning the present invention is a bit which can be expanded in diameter. A, a bit holder B, and a bit diameter expanding rod C.

Thus, in this embodiment, the bit A is provided with flat surfaces 2 and 2 on both sides of the leg body 1, and has a taper-shaped enlarged portion 3 on the outside of the tip end portion and a tip end portion. A tapered surface 4 having a concave shape is provided on the inner side, and a cutting blade 5 made of, for example, a diamond tip is further provided on the surface of the enlarged portion 3, and a flange-shaped engaging projection is formed on the base end portion of the leg 1. It is composed of two divided bit pieces 7, 7 formed by protrudingly forming the engaging portion 6.

In addition, the bit holder B has a vertically elongated split groove 8 on the tip side.
And a pair of groove wall surfaces 8a, 8a are provided opposite to each other, the base end side is integrally formed with the tubular body 9, and a ring-shaped protruding ridge is formed on the inner peripheral surface of the lower end of the tubular body 9. A mounting portion 10 is provided, and further, a mounting portion 11 formed of a female screw portion on the body of the shaving device is provided on the inner peripheral surface of the upper half portion of the tubular body 9.

Further, the bit diameter expanding rod C has a base end portion integrally fixed to a shank 12 of an apparatus main body D, which will be described later, and a tip end portion inserted into the bit A and bit holding body B sides. .

Thus, the bit A having the above-described structure is first installed on the base end side of one of the divided bit pieces 7 of the bit A, as clearly shown in FIGS. 2 to 5, particularly FIG. The bit holding body B is inserted into the tubular body 9 through the dividing groove 8 and the engaging portion 6 is engaged with the engaging portion 10 of the tubular body 9 of the holding body B. The divided bit pieces 7 are attached to the holding body B by engaging the engaging portions 10 of the tubular body 9 of the holding body B so that the divided bit pieces 7 and 7 are in an abdominal shape. Both side surfaces 2 and 2 of each divided bit piece 7 of the bit A attached to the holder B in this manner have both of the dividing grooves 8 of the holder B as clearly shown in FIGS. 2 and 5. The groove wall surfaces 8a and 8a are brought into contact with each other, respectively.

As shown in FIG. 4, the size relationship between the required portions of the bit A and the bit holding body B is shown in FIG. 4, where the outer diameter length of the tip of the bit A is l ₁ and the maximum outer diameter length of the bit holding body B is the when the l _2, by setting the relationship of l ₁ ≧ l _2, even when burying holes of the expansion anchor is deep, those capable KezuNaru the enlarged hole in the inner part of the burying holes .

Thus, the shaving member assembled as described above has the mounting portion 11 formed of the female screw portion of the bit holder B, and the male screw portion provided at the tip of the holder 13 of the shaving device main body D. The device is attached to the main body D by screwing (not explicitly shown) to form a device for expanding the inner diameter of the expansion anchor embedding hole.

In FIG. 1, the reference numerals from the holder 13 to the holder 18 indicate the main constituent members of the main body of the grinding device, 14 is a stopper whose position can be adjusted, 15 is a bearing, 16 is a return spring, and 17 is The spring pins and 18 are spring holding nuts, respectively.

Next, the usage state will be described based on the above embodiment with reference to FIGS. 6 and 7. First, the expansion anchor embedding hole H is appropriately perforated in a desired wall surface W or the like, and the cutting member according to the present invention is inserted into the embedding hole H. (See FIG. 6).
Thereafter, the expanding push-in rod C of the bit A, which is integrally connected to the shank 12 of the apparatus main body D, is pushed in to expand the divided bit pieces 7, 7 as shown in FIG. When A is expanded through the split groove 8 of the bit holder B, and then the shank 12 of the apparatus main body D is rotationally driven to rotate the main abrading member, the inside of the embedding hole H is expanded in diameter. Hole H ₁ is cut and formed.

In performing the cutting and forming work of the expanded diameter hole H ₁ , in the above-described embodiment, the cutting member bit A, that is, each of the divided bit pieces 7 and 7 is smoothly moved through the dividing groove 8 of the bit holding body B. And the enlarged diameter hole H ₁ is cut in the inner part of the embedding hole H by the rotation drive of the device main body D. At this time, the divided bit pieces 7 and 7 are separated from the bit holder B. Although both sides 2 and 2 of each divided bit piece 7 and 7 are expanded outward through the cut groove 8, both groove wall surfaces 8a and 8a of the split groove 8 of the bit holder B are formed.
Since they are slidably opposed to each other, the divided bit pieces 7, 7 are spread in the correct direction. Also, after rotating the bit A of the shank 12 driven to rotate, in the case of KezuNaru the diameter Okuana H ₁ at the back part of the buried hole H also each divided bit pieces 7, 7 bit holder Wall surface 8 of B split groove 8
Since it is abutted against and supported by a and 8a, even if it receives cutting resistance at the time of drilling, there is no twisting at all, and it is possible to accurately form the enlarged diameter deep hole H ₁ of a predetermined diameter length.

Although the main embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and the object of the present invention can be achieved, and within the scope not departing from the gist of the present invention. Of course, various design changes are possible. For example, if the number of divided bit pieces 7 is three or more, correspondingly to the dividing grooves 8 of the bit holder B and the dividing grooves 8 thereof.
The set number and the set direction of both wall surfaces 8a, 8a can be changed appropriately.

(Effects of the Invention) Since the present invention is configured as described above and is used as described above, compared with the above-described prior art,
The following effects can be achieved independently and greatly.

(1) Both side surfaces of each divided bit piece of the expandable bit are
Since it faces the wall surface of each of the dicing grooves of the bit holder, each divided bit piece is expanded in the specified accurate direction when expanding the bit, and the expanded hole with the desired diameter is formed. Can be accurately cut.

(2) With the same configuration as described above, even if the bit is rotated to cut and bore the inner hole, each divided bit piece is supported by contacting both wall surfaces of each of the dividing grooves of the bit holder. Since there is no twisting at all, the effect of the above (1) can be further improved and the service life of the bit can be improved.

(3) Even when the expansion anchor embedding hole is deep and the length of the bit is set to be a long dimension, the dividing groove of the bit holding body is formed to have a long dimension in accordance with the above-mentioned (1). The effect of (2) can be maintained.

(4) Since the bit, the bit holder, and the device body are separately assembled and configured to be disassembled, when each member, particularly the bit is damaged, it can be easily replaced and the economy can be improved.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall cross-sectional view of a diameter-expanding device for deepening the inner part of an expansion anchor embedding hole, and FIG. FIGS. 3A and 3B are explanatory views of the mounting state of the divided bit pieces to the bit holder in the main part, FIG. 4 is a sectional view showing the main part of the shaving member of the present invention, and FIG. 5 is IV in FIG. Sectional views taken along line IV, FIG. 6 and FIG. 7 are explanatory views showing the construction state according to the present invention. (Explanation of symbols) A ... bit, B ... bit holder, C ... rod, D
...... Abrasion device body, 2 ... Both sides of split bit piece, 5 ...
… Cutting blade, 7 …… Separating bit piece, 8 …… Splitting groove, 8a ……
Groove wall surface of the split groove, 10 ... Locking part.

Claims (3)

[Claims] 1. A diametrically expandable bit consisting of a plurality of divided bit pieces each having an abrading blade on the outer surface of the distal end portion, and a split groove having a required length provided vertically on the distal end side, and at the base end side. A bit holder having an engaging portion for attaching each divided bit piece and a mounting portion to the main body of the shaving device, and a pushing rod for expanding the diameter of the bit inserted through the bit holder and the bit. Insert the bit into the bit holder and attach the bit to the bit holder detachably with both side surfaces of each divided bit piece facing the groove wall surface of the dividing groove of the bit holder.
An abrading member in a device for enlarging a diameter of a deep part of an expanding anchor embedding hole, wherein the holder is detachably attached to an abrading device main body. 2. The engaging portion of each divided bit piece is constituted by an engaging projection protruding outward, and each engaging projection is engaged with a protruding ridge protruding on the inner peripheral surface of the bit holding body at the base end side. The bit is attached to the bit holder together, and the cutting member in the device for expanding the inner diameter of the expansion anchor burying hole according to claim (1). 3. A bit holder is attached to the main body of an abrading machine by screwing a female screw portion provided on the inner peripheral surface of the base of the bit retainer into a male screw portion provided on the outer peripheral surface of the tip of the abrading machine body. An abrading member in a device for enlarging a diameter of an inner part of an expanding anchor embedding hole according to claim 1, which is attached.