JPH07246568A - Tool for bolt work - Google Patents

Abstract

PURPOSE:To carry out the installation work of a bolt, an the removal work from the bolt after the bolt is buried in a concrete an the like easily an rapidly, an to make the handling very convenient. CONSTITUTION:A tool main body 1 to be rotated; a holding means 50 to which a bolt 54 installed to the tool main body 1 is screwed up; and a piston 14 installed slidable in a cylinder chamber 9 formed in the tool main body 1, and a pressed in the retreating direction by the screwing of the bolt 54; are provide. Furthermore, a fluid return means having a fluid reservoir 34 communicating to the sylinder chamber 9 through a fluid passage is provided in the tool main body 1, and a releasing means to block the flow-in of the fluid in the cylinder chamber 9 into the fluid reservoir 34 allowable to release the blocking, when the piston 14 is pressed in the retreating direction by the bolt 54, and to allow the flow-in of the fluid in the fluid reservoir 34 into the cylinder chamber 9, is provided on the fluid passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt construction tool which is optimal for fixing anchor bolts to skeleton concrete, for example.

[0002]

2. Description of the Related Art Conventionally, anchor bolts are often used when attaching other structures such as wooden structures and reinforcing bars or equipments to concrete structures. As a construction means of this anchor bolt, as shown in FIG. 8, first, a perforation 101 having a predetermined size is formed at a predetermined position of the skeleton concrete 100 with a perforation machine, and the perforation 101 is filled with a hardening accelerator or the like. The resin capsule 102 is inserted.

Further, at the upper end of the anchor bolt 104,
The W nut 105 is attached to the W nut 105,
A box 106 attached to a rotary electric tool is fitted, the capsule 102 is broken by the rotational impact of the anchor bolt 104, and the anchor bolt 104 is integrally fixed to the concrete 100 by a hardening accelerator or resin.

[0004]

However, the above-described conventional anchor bolt construction means has a drawback that it takes a lot of time to attach the W nut 105 to the anchor bolt 104, which makes the work complicated and troublesome.

Further, the W nut 105 must be removed from the anchor bolt 104 after construction. Since the anchor bolt 104 is rotated via the W nut 105, the W nut 105 is firmly fastened to the anchor bolt 104. Therefore, there is a drawback that it becomes difficult to remove the W nut 105.

The present invention has been made in view of the conventional problems as described above, and it is possible to easily and quickly remove a bolt from the bolt after mounting the bolt and embedding the bolt in concrete or the like. , It is an object to provide a bolt construction tool which is very convenient to handle.

[0007]

The technical means that the present invention has taken to solve the above-mentioned problems are as follows. That is, the tool main body 1 to be rotated, the holding means 50 attached to the tool main body 1 and screwed with the bolt 54, and slidably fitted in the cylinder chamber 9 formed in the tool main body 1 and Piston pushed backward by screw 54 bolt
And a fluid reservoir 34 communicating with the cylinder chamber 9 through a fluid escape passage in the tool body 1.
Is provided in the fluid escape passage so as to releasably prevent the fluid in the cylinder chamber 9 from flowing into the fluid reservoir 34 when the piston 14 is pushed in the backward direction by the bolt 54. Is provided with a releasing means,
The fluid return passage 45 formed in communication with the cylinder chamber 9 and the fluid reservoir 34 allows the fluid in the fluid reservoir 34 to flow into the cylinder chamber 9, and allows the fluid in the cylinder chamber 9 to flow. A check valve 48 is provided to prevent the gas from flowing into the fluid reservoir 34.

Further, a tool body 1 which is rotated, and a holding means 50 which is attached to the tool body 1 and into which a bolt 54 is screwed,
The tool body 1 is provided with a piston 14 slidably fitted in a cylinder chamber 9 and pushed backward by screwing of the bolt 54. Further, the tool body 1 has a fluid passage. A fluid return means having a fluid reservoir portion 34 communicating with the cylinder chamber 9 through the cylinder is provided, and the fluid in the cylinder chamber 9 is retained in the fluid passage when the piston 54 is pressed in the backward direction by the bolt 54. There is provided a releasing means for releasably blocking the inflow into the fluid reservoir 34 and allowing the fluid in the fluid reservoir 34 to flow into the cylinder chamber 9.

[0009]

In the bolt construction tool of the present invention, first, the bolt 54 is screwed into the holding means 50, and further, the tool is attached to a rotary electric tool such as an electric drill, and the bolt 54 is rotated and embedded together with the tool. Put in. Due to the impact at this time, the bolt 54 is rotated relative to the holding means 50 and screwed, and the piston 54
Push 14 in the backward direction.

At this time, the releasing means and the check valve 48
Prevents the fluid in the cylinder chamber 9 from flowing into the fluid reservoir 34, so that the fluid in the cylinder chamber 9 is compressed, and its compressive force prevents the piston 14 from moving backward, Fix 54 without screwing.

When the releasing means is released after the work of embedding the bolt 54 is completed, the fluid in the compressed cylinder chamber 9 flows into the fluid reservoir 34 through the fluid escape passage, and the inside of the cylinder chamber 9 is closed. Is decompressed. Therefore, the piston
14 is free to move in the screw 54 threading direction,
The fastening between the holding means and the holding means is released, and the bolt 54 can be easily and quickly removed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention, in which FIG. 1 shows a tool main body 1, which is a front member 3, a cylinder body 4 attached to the rear end of the front member 3, and a rear member. 7 and 7.

A female screw body 6 is fixed to the rear portion of the front member 3, and a front end portion 4a of the cylinder body 4 is screwed into the female screw body 6. Also, in the rear part 4b of the cylinder body 4,
A rear member 7 is screwed to form a first cylinder chamber 9 filled with oil in the cylinder body 4. Reference numeral 8 is a detent pin fitted between the front member 3 and the cylinder body 4 to prevent relative rotation between them, and 10 is a seal ring for sealing the cylinder body 4 and the rear member 7.

In the front member 3, a sliding hole 11 communicating with the first cylinder chamber 9 of the cylinder body 4 is formed in the longitudinal direction, and the sliding hole 11 is provided in the first cylinder chamber 9. A piston rod 14a of a piston 14 having a piston portion 13 fitted therein is slidably inserted.

On the opposite side of the piston portion 13 and the rear member 7,
Recesses 16 and 17 are formed, and a return spring 18 for pushing the piston 14 forward is interposed in both recesses 16 and 17. Oil is filled between the piston portion 13 and the rear member 7.

Reference numeral 20 denotes a steel ball storage hole formed in the radial direction of the rear member 7 as shown in FIG. 3, and the steel ball storage hole 20 and the recess 17 of the rear member 7 form a first oil passage 21. While being communicated, the steel ball storage hole 20 is communicated via a small diameter oil passage 24 to a release body storage recess 23 in which a release body 25 is slidably fitted. The steel ball 27 stored in the steel ball storage hole 20 is urged by a spring 26 for releasably closing the small diameter oil passage 24.

At the tip of the releasing member 25, the small-diameter oil passage 24 is provided.
A pressing portion 28 which is inserted in the steel ball 27 and is abutted against the steel ball 27 is formed, and the other end side (the upper side shown in FIG. 1) of the releasing body 25 is swingably attached to the rear member 7 via a pivot pin 30. Pivoted release lever 29
A bolt 31 screwed into the abutment is abutted. Therefore, by swinging the release lever 29, the release body 25 is pushed in, the steel ball 27 is moved by the release body 25 against the spring 26 and the hydraulic pressure, and the small diameter oil passage 24 can be released. It has become. A spring 32 is interposed between the rear member 7 and the release lever 13 and biases the release lever 29 in the opening direction. Note that the steel ball 27, the pressing body 25, and the spring 26 constitute a releasing means.

A second cylinder chamber 34 (fluid reservoir), in which a piston 33 is slidably fitted, is formed in the rear portion of the rear member 7, and the second cylinder chamber 34 is attached to the rear member 7 by a closing member. 36
Are screwed together to be closed hermetically. Recesses 38 and 39 are formed on the surfaces of the piston 33 and the closing body 36, respectively, and a return spring 41 for pushing the piston 33 forward is interposed between the recesses 38 and 39.
The second cylinder chamber 34, the piston 33, and the return spring 41 constitute a return means. Reference numeral 42 denotes an exhaust passage capable of exhausting air inside the second cylinder chamber 34 and behind the piston 33 to the outside.

Reference numeral 43 is a second oil passage that connects the releasing body accommodating recess 23 and the second cylinder chamber 34, and 45 is the first cylinder chamber 9 of the cylinder body 4 and the second cylinder chamber of the rear member 7.
A third oil passage serving as a fluid return passage communicating with 34. In the third oil passage 45, oil flows backward from the second cylinder chamber 34 of the rear member 7 to the first cylinder chamber 9 of the cylinder body 4. Check valve comprising a steel ball 46 housed in a steel ball housing hole 44 and a spring 47 for urging the steel ball 46 for preventing
48 are provided. Incidentally, the first oil passage 21, the steel ball storage hole
The 20, small-diameter oil passage 24, and second oil passage 43 form a fluid escape passage.

As shown in FIGS. 1 and 2, reference numeral 50 denotes a plurality of notches 51 formed radially at the front end of the front member 3 and
The rear part is a plurality of half nut bodies that are pivotally supported via pivot pins 52 as holding means, and each half nut body 50 is expandable and contractible, and, in the closed posture along the front member 3, the anchor bolt 54 Female thread portions 55 that can be screwed with each other are formed.

Reference numeral 57 denotes a cylindrical grip slidably fitted on the front member 3, and a front portion is provided between the front member 3 and a storage portion 58 formed on the inner periphery of the rear end portion of the grip 57. A return spring 60 externally fitted to the member 3 is interposed. Accordingly, the grip 57 is biased forward by the return spring 60 to accommodate each half nut body 50, and the forward movement is restricted by the stopper portion 59 projecting radially outward of the front member 3.

Reference numeral 62 designates a plurality of springs for urging the respective half nut bodies 60 in the expanding direction.
It is housed in a concave portion 63 formed in, and one end thereof is supported by an annular portion 64 provided at the front end of the front member 3.

An embodiment of the present invention has the above-mentioned configuration,
Next, as shown in FIGS. 5 and 6, the case where the anchor bolt 54 is embedded in the frame concrete 66 using the tool will be described. First, as in the conventional method, a perforation 67 having a predetermined size is formed in a vertical direction in the frame concrete 66 by a perforation machine and the perforation is performed.
A capsule (not shown) filled with a curing accelerator or the like is inserted into 67.

On the other hand, when the grip 57 is pulled backward against the return spring 60, the grip 57 moves backward,
Each spring 62 radially expands the tip end side of the half nut body 50 to a predetermined position (see FIG. 4).

Further, when the anchor bolt 54 is inserted between the expanded half nut bodies 50 and the grip 57 is released, the grip 57 is returned to the front by the return spring 60, and the diameter of each half nut body 50 is reduced. It is housed in the grip 57 while being screwed into the anchor bolt 54 (see FIG. 1).

Next, after the tool body 1 is attached to the chuck portion 69 of the electric tool via the connecting rod 68, the anchor bolt
54 is inserted into the hole 67, but the anchor bolt
Since 54 is screwed and held by the half nut body 50, there is no possibility that it will fall out. Therefore, the operator can hold the relatively heavy power tool with both hands firmly and in good balance.

Anchor bolt in a stable state of the power tool
When 54 is rotated and pushed into the perforation 67 of the skeleton concrete 45, the capsule is destroyed by the rotational impact of the anchor bolt 54.

When the anchor bolt 54 is embedded, the anchor bolt 54 rotates relative to the half nut body 50, so that the piston 14 is pushed backward. The release means for the steel balls 27 and the check valve 48 prevent the oil in the first cylinder chamber 9 of the cylinder body 4 from flowing into the second cylinder chamber 34 side of the rear member 7, so that the first cylinder chamber The oil in 9 is compressed by the piston portion 13, and the compression force fixes the piston 14 before the piston portion 13 contacts the rear member 7 (see FIG. 2).

When the piston 14 is fixed, the rotational force of the anchor bolt 54 that abuts the tip of the piston 14 tries to expand the diameter of each half-nut body 50 screwed together, but the half-nut body 50 is gripped. Since it is held by 57, the anchor bolt 54 can be fixed.

Next, after the anchor bolt 54 has been embedded, the anchor bolt 54 and the tool are separated, but since the half nut body 50 is pressed against the inner surface of the grip 57 by the anchor bolt 54, the grip 57 is removed. Is difficult to draw. Then, when the release lever 29 is swung, the release lever 29 pushes the release body 25, and the released release body 25 pushes the steel ball 27 against the spring 26 and the hydraulic pressure, and the steel ball storage hole 20 And the release body storage recess 23 are communicated and released.

Therefore, the compressed oil in the first cylinder chamber 9 is stored in the first oil passage 21, the steel ball storage hole 20, and the release body storage recess 23.
Then, the piston 33 is retracted through the second oil passage 43 and flows into the second cylinder chamber 34. For this reason, the pressing force that fixes the piston 14 in the axial direction is reduced, so that the piston 14 is allowed to move rearward, and the fastening force generated between the anchor bolt 54 and each half nut body 50 is removed. Therefore, the frictional force between the grip 57 and the half nut body 50 is reduced, and the grip 57 can be easily pulled. When the grip 57 is pulled, each half nut body 50
By the action of, the anchor bolt 54 can be expanded and the anchor bolt 54 can be detached.

When releasing the release means, the release lever
29 is operated to push the steel ball 27 with the pressing body 25, but even when a strong force acts on the anchor bolt 54, the steel ball 27 can be easily released, and therefore, the release is performed. It is also possible to shorten the lever 29.

On the other hand, the piston portion in the first cylinder chamber 9
13 is pushed forward by the return spring 18 and the piston
14 advances and the front end of the piston part 13 contacts the bottom surface of the cylinder body 4. The oil flowing into the second cylinder chamber 34 of the rear member 7 is pushed out by the piston 33 pressed by the return spring 41, and passes through the third oil passage 45 and the check valve 48 to the first cylinder of the rear member 7. Returned to chamber 9.

In this embodiment, the passage for releasing the oil and the passage for returning the oil are provided separately and each has a check function. Therefore, by strengthening the elastic force of the spring 26 for urging the steel ball 27 of the releasing means, the steel ball 27 can be reliably fixed against the centrifugal force when the tool body rotates at high speed. Since the steel ball 46 of the check valve 48 is not affected by the centrifugal force due to the rotation of the tool body, the elastic force of the spring 47 is sufficient to hold the steel ball 46 and it does not hinder the oil return. Can be

FIG. 7 shows another embodiment of the present invention, in which the fluid return passage 45 and the check valve 48 are eliminated, and the fluid relief passage also has a function as a fluid return passage. The oil is movable between the first cylinder chamber (9) and the second cylinder chamber (34). Therefore, in this embodiment, since the single fluid passage 21a has both the function of releasing and returning the oil, there is an advantage that the structure is simple.

Incidentally, the present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, oil is exemplified as the fluid, but gas other than liquid such as oil may be used.

Although the cylinder chamber 34 and the piston 33 are used as the returning means, it is a bag-shaped member made of a sheet having an elastic expansion / contraction force so that the internal volume of the fluid changes. Alternatively, the oil in the oil reservoir may be pressure-fed to the cylinder chamber 9.

Further, in the above embodiment, the anchor bolt 54
Is in contact with the tip of the piston rod 14a of the piston 14, but the bottle 54 and the piston 14 may contact with each other via an intermediate member, or between the bottle 54 and the piston rod 14a. A configuration in which oil or the like is interposed may be used, and the piston 14 may be configured to be pressed by the anchor bolt 54 regardless of the presence or absence of the piston rod 14a. Further, the number of the half nut bodies 50 is not particularly limited as long as it is a plurality of pieces such as two or three, and the type of bolt and other constituent members are not limited to the above implementation. Of course.

[0039]

Since the present invention is constructed as described above,
Bolt mounting work and embedding the bolt in concrete etc. and detaching work from the bolt can be performed easily and quickly with one touch, and there is an advantage that work efficiency is improved and handling is very convenient. .

Also, since the bolt is fixed by restricting its axial movement by the holding means, it is possible to effectively prevent the threaded portion of the bolt from being damaged.

Moreover, since the bolt is screwed and held by the holding means, it is not necessary to hold the bolt by hand before starting the embedding work, and therefore even if the electric tool is relatively heavy. It is possible to work while holding the power tool with both hands while maintaining a good balance, and its practical value is remarkable.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is a sectional front view showing a state where the piston presses a fluid.

FIG. 3 is a sectional view of the same main part.

FIG. 4 is a cross-sectional view of an essential part of the same holding body in a state where the holding body is expanded.

FIG. 5 is a partial cross-sectional front view showing a state in which the anchor bolt is inserted into the building concrete.

FIG. 6 is a partial cross-sectional front view showing a state in which the bolt construction tool is detached from the driven anchor bolt.

FIG. 7 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

1 ... Tool body, 9 ... Cylinder chamber (first cylinder chamber), 13 ... Piston part, 14 ... Piston, 33 ... Piston,
34 ... Second cylinder chamber (fluid reservoir), 45 ... Fluid return passage, 48 ... Check valve, 54 ... Anchor bolt (bolt)

Claims (3)

[Claims] 1. A tool body (1) which is rotated, a holding means (50) which is attached to the tool body (1) and into which a bolt (54) is screwed, and a tool body (1) formed on the tool body (1). A piston (14) which is slidably fitted in the cylinder chamber (9) and is pushed backward by screwing of the bolt (54), and the fluid escape to the tool body (1). A fluid return means having a fluid reservoir (34) communicating with the cylinder chamber (9) through a passage is provided, and the fluid relief passage is pressed by the bolt (54) in the backward direction of the piston (14). At the same time, a releasing means for releasably blocking the fluid in the cylinder chamber (9) from flowing into the fluid reservoir (34) is provided, and the cylinder chamber (9) and the fluid reservoir (34) are further provided. The fluid return passageway (45) formed in communication with the fluid in the fluid reservoir (34) A check valve (48) is provided which allows the fluid to flow into the cylinder chamber (9) and prevents the fluid in the cylinder chamber (9) from flowing into the fluid reservoir (34). A bolt construction tool. 2. A tool body (1) which is rotated, a holding means (50) which is attached to the tool body (1) and to which a bolt (54) is screwed, and a tool body (1) formed on the tool body (1). A piston (14) which is slidably fitted in the cylinder chamber (9) and is pushed in the backward direction by the screwing of the bolt (54), and the tool body (1) has a fluid passage. A fluid return means having a fluid reservoir (34) communicating with the cylinder chamber (9) via a cylinder is provided in the fluid passage when the piston (14) is pressed in the backward direction by the bolt (54). , The fluid in the cylinder chamber (9) is the fluid reservoir (34)
Bolt construction, characterized in that release means is provided for releasably blocking the inflow into the cylinder and allowing the fluid in the fluid reservoir (34) to flow into the cylinder chamber (9). Tools. 3. The bolt construction tool according to claim 1, wherein the fluid is oil.