JPH058328Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is mainly used when installing embedded screws that are installed in enlarged diameter holes that have an enlarged diameter part called an undercut deep inside. The present invention relates to a driving device, and more particularly to a driving device for a deployable sleeve which is a component of this embedded screw.

(Prior Art) Anchor bolts are sometimes planted on a surface to be fixed, for example, a hardened concrete surface, to attach other articles.

By the way, the present applicant has already proposed several embedded screw structures suitable for the above-mentioned enlarged diameter hole. One of them is shown in an exploded perspective view in FIG. According to this, there is a sleeve body 1 having female screw holes 4 at both ends and a driver engagement groove 5 formed on the outer end surface, and a plurality of slits 6 connected to the sleeve body 1 on the circumferential surface. a deployable sleeve 2 having a plurality of deployable pieces 7;
It consists of an embedded bolt 3 which has a bolt part 9 screwed into the female threaded hole 4 of the sleeve main body 1 at the upper part and has an overhanging tapered surface 8 at the lower part.

The conventional construction procedure for this configuration will be explained based on FIG. 9. First, the embedded bolt 3 is inserted into the enlarged diameter hole A having the enlarged diameter part B drilled in the concrete surface, and then the deployable sleeve 2 is inserted. After insertion, the deployment sleeve 2 is placed lightly on the tapered surface 8 of the embedded bolt 3 at the enlarged diameter portion B in the hole (see FIG. 9a).
Next, a driving rod C having a cylindrical portion having approximately the same diameter as the deployable sleeve 2 prepared separately is inserted into the hole,
When the lower end of the rod is placed against the outer end surface of the deployable sleeve 2 and the head of the driving rod C is hit with a hammer F, each deployable piece 7 of the deployable sleeve 2 has a thin connecting portion 10 at its base curved and becomes sliding contact is developed along the protruding tapered surface 8 of the embedded bolt 3,
It is pressed against the hole wall (see Figure 9b). After that, insert the sleeve main body 1 into the hole, screw together the internal female thread 4 of the sleeve main body 1 with the bolt part 9 of the embedded bolt 3, and engage the tip with the driver engagement groove 5 using an appropriate screwdriver. When the sleeve body 1 is screwed into the sleeve body 1, the sleeve body 1 finally comes into contact with the outer end surface of the deployment sleeve 2, and the sleeve body 1 is fixed in the hole (see FIG. 9c). In this way, an embedded screw is provided in the enlarged diameter hole A, and is used to fix the structure E etc. to the concrete surface with the mounting bolt D using the outer end female screw 4 of the sleeve body 1. (See Figure 9d).

(Problem to be solved by the invention) However, the driving tools (driving rod C and mallet F) for the deployment sleeve 2 as described above require considerable labor and In addition to taking time, it is difficult to always maintain a constant implantation amount. If the amount of driving of the deployment sleeve 2 is not constant, the deployment sleeve 2 may get stuck to the hole wall and not be crimped, and the embedded bolt 3 may not be firmly fixed. If the embedded bolt 3 is not firmly fixed, it will not be possible to secure the mounting strength of the structure E to be attached later.

In view of this, an object of the present invention is to provide a driving device that can easily and reliably drive a deployment sleeve by a certain amount without requiring any effort.

(Means for Solving the Problems) Therefore, the driving device according to the present invention includes: a driving outer body having a connecting portion of a hammer drill and having a cylindrical portion; a driving inner cylinder fitted into the cylindrical portion; a guide body fitted into the driving inner cylinder and disposed with an elastic body interposed between it and the driving outer body, a circumferential groove being formed on the inner surface of the cylinder of the driving outer body; A through hole is provided at a position on the opposing driving inner cylinder side, and a spherical body is loosely fitted into the space formed by the circumferential groove and the through hole in a state before the driving inner cylinder is operated, and a spherical body is loosely fitted into the through hole. An outer circumferential groove is formed on the outer surface of the guide body at a distance of a certain distance, and the through hole and the outer circumferential groove communicate with each other in a state where the outer driving inner cylinder is driven by the certain amount, and , a projecting piece that engages with the driver groove is protruded at the tip, a cylindrical part is formed on the opposite side, and an engaging means for driving into the peripheral wall of the cylindrical part and engaging with the inner cylinder, and transmitting torque. The present invention is characterized in that it is equipped with a driver jig equipped with a torque transmission means for tightening and an insertion hole for inserting a retightening rod.

(Function) In the present invention configured as described above, when the hammer drill is connected to the driving outer body and operated,
The impact force is transmitted to the driving inner cylinder via the spherical body,
The deployment sleeve is driven in by the driving inner cylinder. When a predetermined amount is driven in, the through hole provided in the driving inner cylinder and the outer circumferential groove provided in the guide body communicate with each other. on the other hand,
A horizontal component of the force acting in the vertical (up and down) direction of the driving body acts on the spherical body, and the spherical body is pushed inward, detaching from the circumferential groove of the driving body and moving inside the through hole. However, it finally moves to a position where it comes into contact with the outer circumferential groove of the guide body. At this time, the elastic body interposed between the driving outer body and the guide body is compressed, and when the driving device is pulled out from the enlarged diameter hole, this elastic body tries to expand to its original state. As a result of this action, the spherical body separates from the outer circumferential groove again, moves within the through hole, and returns to the position where it comes into contact with the circumferential groove of the driving outer body. The guide body is then pushed back to its original position by the stretching force of the elastic body.

(Embodiment) Hereinafter, an embodiment of the driving device according to the present invention will be described with reference to the drawings. Note that components having the same configuration as the conventional one are indicated using the same reference numerals.

As shown in the longitudinal sectional view of the driving device H of the present invention in FIG.
A driving outer body (hereinafter referred to as "outer body") 2 having b
1, a driving inner cylinder (hereinafter referred to as "inner cylinder") 11 fitted into this cylindrical portion 21b, and a rod-shaped guide body 18 fitted into this inner cylinder 11.

A hammer drill attachment portion is formed in the rod-shaped portion 21a at the top of the outer body 21, to which a hammer drill (not shown) is connected. A pin 23 is attached to the lower end of the outer body 21 and engages with a long hole 13 provided in the inner tube 11, thereby functioning as a retainer for the inner tube 11 to come off.

Further, a circumferential groove 17a having a semicircular arc cross section is provided slightly above the pin 23 into which a part of a spherical body (hereinafter referred to as "steel ball") 17 such as a steel ball is inserted. As shown in FIG. 2, a plurality of steel balls 17 (three in this embodiment) are arranged on the circumference. Further, the circumferential groove 17a is provided over a part or preferably the entire inner surface of the cylindrical portion 21b. On the other hand, a corresponding through hole 12 is formed in the inner cylinder 11 . Furthermore, a protrusion 14 is formed continuously or discontinuously along the circumference on the inner surface of the substantially intermediate portion of the inner cylinder 11 . A roller hole 15a is formed at the lower end of the inner cylinder 11, and a cylindrical roller 15 is housed in the roller hole 15a with its axis standing upright. A plate spring 16 is wound around the back surface of the roller 15 along the outer peripheral surface of the inner tube 11. As shown in FIG. 3, the roller hole 15a is opened so as to be slightly pinched inward, so that the roller 15 is held within the roller hole 15a. The rollers 15 are urged inward by a leaf spring 16 on the back, and in this state the rollers 15 slightly protrude from the inner surface of the inner cylinder 11. With this configuration, the inner surface of the inner cylinder 11 does not come into sliding contact with the bolt portion 9 of the embedded bolt 3, so that the screw thread is not damaged.

A recess 20 is provided at the upper end of the guide body 18 fitted in the inner cylinder 11, and the recess 20 and the outer body 21
An elastic body 24 such as a spring is interposed between the concave portion 22 and the concave portion 22 provided at the upper part of the inner surface. An outer circumferential groove 19 is provided on the outer surface of the guide body 18, through which the steel ball 17 enters and exits. In addition, the inner cylinder 1
A reduced diameter portion 18a is formed at the lower portion of the guide body 18 to engage with the protrusion 14 of the inner cylinder 11, and restricts upward movement of the inner cylinder 11.

Next, a driver jig (hereinafter referred to as "jig") that is configured to be detachably attached to the driving device H will be explained. As shown in FIG. 6, this jig 30 consists of a cylindrical portion 31 and a circular portion 32 having a protruding piece 33 protruding from its tip that engages with the driver groove.
A hole 3 for holding a steel ball 34 is provided at the upper end of the cylindrical portion 31.
4a is open, and a spring 35 is provided on the outside in contact with the steel ball 34, and urges the steel ball 34 inward. Driving device H
A part of the steel ball 34 enters a groove 25 (FIG. 7) formed on the lower outer circumferential surface of the inner cylinder 11 of the driving device to engage the two. The torque transmitting pin 37 provided at the base of the cylindrical portion 31 is connected to a pin groove 3 formed at the lower end of the inner cylinder 11 of the driving device H.
7a to apply the torque of the driving device H to the pin 37.
The signal is transmitted to the jig 30 via the .
Note that 36 is an insertion hole provided near the middle of the cylindrical portion 31 for insertion of a retightening rod. As shown in the perspective view of FIG. 7, the cylindrical portion 32 of the jig 30 is formed into a stepped cylindrical shape, and has a protruding piece 33 of a driver protruding from its tip.

Next, the operation of the above-mentioned driving device will be explained based on FIG.

In the sectional view of Fig. 4a, the enlarged diameter part B of the enlarged diameter hole A
A state in which the embedded bolt 3 is inserted and the deployable sleeve 2 is fitted and placed on the tapered surface is shown. In this state, insert the lower end of the inner cylinder 11 into the enlarged diameter hole A,
At the same time, the lower end of the guide body 18 is brought into contact with the upper end of the embedded bolt 3 and set. Then, a hammer drill (not shown) is operated to drive the deployment sleeve 2 into place. In this case, the impact force of the hammer drill is transmitted from the outer body 21 to the inner cylinder 11 via the steel balls 17. The inner cylinder 11 is guided in sliding contact with the guide body 18, and the lower deployment sleeve 2 is driven into the inner cylinder 11. Finally, as shown in Figure 4b, the deployment sleeve 2
In the state where it is expanded and crimped to the enlarged diameter part B,
When the steel ball 17 comes to the position of the outer peripheral groove 19 of the guide body 18, the steel ball 17 based on the vertical force of the outer body 21
The steel ball 17 is pushed inward by the horizontal force acting on the spherical surface of the guide body 18 and enters the outer circumferential groove 19 of the guide body 18. Then, the engagement between the outer body 21 and the inner cylinder 11 is released, and the impact force of the hammer drill is no longer transmitted to the inner cylinder 11. In this state, the elastic body 2
4 is compressed. In this way, the deployment sleeve 2 moves the steel ball 17 in the vertical direction, that is, in FIG. 4a.
It is driven in by a vertical distance below the circumferential groove 17a of the outer body 21 and the outer circumferential groove 19 of the guide body 18, thereby making it possible to always ensure a constant driving amount. Note that during driving, the roller 15 always comes into contact with the bolt portion 9 so as not to damage the thread.

After driving the deployment sleeve 2 by a predetermined amount in this manner, the driving device H is pulled out from the enlarged diameter hole A. By doing so, the lower end of the guide body 18 is released from the restraint caused by the upper end of the embedded bolt 3 and is free to move downward, and the horizontal component of the vertical force that causes the elastic body 24 to return to its original state. acts on the steel ball 17, and the steel ball 17 again leaves the outer circumferential groove 19 of the guide body 18 and enters the circumferential groove 17a of the outer body 21. Then, the outer body 21 moves upward together with the inner cylinder 11 and returns to its original state as shown in FIG. 4a.

After the driving of the expansion sleeve 2 is completed and the driving device is pulled out, the driver jig 30 described above is engaged. On the other hand, the sleeve body 1 is inserted into the enlarged diameter hole A, the protrusion piece 33 of the jig is engaged with the driver engagement groove 5, and the hammer drill is operated again to screw the sleeve body 1 into the embedded bolt 3. . Finally, remove the driving device H from the jig 30 and insert a retightening rod (not shown) into the insertion hole 36 of this jig 30 to retighten the sleeve body 1 to ensure that the sleeve body 1 is tightened securely. Screw and fix to the embedded bolt 3.

(Effects of the invention) As explained above, according to the driving device according to the present invention, it is possible to always secure a constant driving amount for the deployment sleeve, for example, so that the deployment sleeve can be reliably driven into the expanded diameter portion ( (undercut part), and as a result, embedded bolts can be firmly fixed.

In addition, since there is no need to drive by input using a driving rod and a mallet as in the conventional case, the driving work can be performed quickly and without labor.

Furthermore, the screwing work between the sleeve body and the embedded bolt can be done by attaching a driver jig to the driving device and using mechanical force, so it does not require any effort and can be screwed securely. Further, additional tightening can be easily done using an additional tightening rod.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the driving device of the present invention, Fig. 2 is a sectional view taken along the line ~ in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Figs. 4 a and b.
is a cross-sectional view for explaining the operation of the driving device of the present invention, FIG. 5 is a cross-sectional view of the driver jig of the present invention set in the driving device, FIG. 6 is a cross-sectional view taken along the line ~ in FIG. 5, FIG. 7 shows perspective views of the circular parts. Fig. 8 is an exploded perspective view of the embedded screw structure used in the conventional and present invention, Fig. 9a,
b, c, and d are cross-sectional views showing the construction procedure of the embedded screw structure according to the prior art. 1... Sleeve body, 2... Deployment sleeve, 3
...Embedded bolt, 11... Drive-in inner cylinder, 12...
...Through hole, 17... Spherical body, 17a... Circumferential groove, 1
8... Guide body, 19... Outer circumferential groove, 21... Driving outer body, 21b... Cylindrical portion, 24... Elastic body, 30...
...Driver jig, 31... Cylindrical portion, 32... Circular portion, 33... Projection piece, 34... Steel ball, 36... Insertion hole, H... Drive device.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A driving outer body having a connecting part of a hammer drill and having a cylindrical part, a driving inner cylinder fitted into the cylinder part, and a driving inner cylinder fitted into the driving inner cylinder. and a guide body arranged with an elastic body interposed between it and the driving outer body, a circumferential groove is formed on the inner surface of the cylindrical portion of the driving outer body, and a circumferential groove is formed on the driving inner cylinder side opposite to the guide body. A through hole is provided at the position, and a spherical body is loosely fitted into the space formed by the circumferential groove and the through hole in a state before the driving inner cylinder is operated, and is spaced a certain distance from the through hole. A driving device characterized in that an outer peripheral groove is formed on the outer surface of the guide body, and the through hole and the outer peripheral groove communicate with each other when the driving inner cylinder is driven by the certain amount. (2) a protruding piece protrudingly provided at the tip to engage with the driver groove; a cylindrical part formed on the opposite side; an engaging means for driving into the peripheral wall of the cylindrical part and engaging the inner cylinder;
2. The driving device according to claim 1, further comprising a driver jig equipped with a torque transmitting means for transmitting torque and an insertion hole for inserting a retightening rod.