JPS5936609Y2 - Tightening unit for threaded reinforcing bars - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tightening unit for a threaded reinforcing bar joint.

Traditionally, so-called threaded reinforcement bars (
For example, Japanese Patent Publication No. 48-25640 and Japanese Patent Publication No. 48-36
(Refer to Publication No. 930) are connected with joint pipes and used as reinforcing bars for concrete structures.

In order to tighten the above-mentioned pipe, the applicant previously used Fig. 5.

We proposed a tightening unit with a reaction force receiver 5 as shown in Fig. 6.

(Jitsugan No. 52-44146). In the above-mentioned tightening unit, the Nokento gear 2 for NAND tightening is fitted into the main body 1 so as to be freely rotatable, and the reaction force receiver 5 is slidable on a guide plate 50 which is freely rotatably attached to the main body 1 in a plane parallel to the Nokento gear 2. It fits.

When using the tightening unit, two threaded reinforcing bars 92
．． 93 are screwed into both ends of the joint pipe 9, and the reinforcing bars 92.
The Nand 91 screwed into the joint 93 is crimped to both end surfaces of the joint pipe 9 by hand to the extent possible.

At this time, the phases of the NAND 91 and the joint pipe 9 usually do not match.

Therefore, as shown by the two-dot chain line in FIG. 5, the reaction force receiver 5 is slid over the guide plate 50 and retreated upward, and in this state, the unit body is lowered onto the threaded reinforcing bar, and the opening 22 of the socket gear 2 is opened 91. Insert.

The guide plate 50 and therefore the reaction force receiver 5 are rotated, and the reaction force receiver 5 is rotated.
The reaction force receiver 5 is advanced toward the joint pipe 9 at a position where the engaging groove 51 and the width across flats of the joint pipe 9 correspond, and the reaction force receiver 5 and the joint pipe 9 are engaged with each other.

Manual: Operate the handle 94 to rotate the socket gear 2 and tighten the nut 91.

Since the unit body 1 is fixed to the joint pipe 9 via the reaction force receiver 5, there is no danger of the unit body 1 swinging around due to the reaction force when tightening and tightening the NAND.

However, when engaging the reaction force receiver 5 and the joint pipe 9, the reaction force receiver must first be retracted, then the reaction force receiver must be rotated, and then the reaction force receiver must be moved forward. The problem is that the guide plate 50 has to be moved over soil and the guide plate 50 has to be rotated, making it difficult to handle.

This invention allows the reaction force receiver to be rotatably attached to the fastener body perpendicular to the rotational plane of the socket gear, making it easy to connect and disconnect the reaction force receiver and the joint pipe, and the screw joint is easy to handle. This invention provides a tightening unit for reinforcing bars.

The present invention will be specifically described below based on embodiments shown in the drawings.

Figures 1 and 2 show a situation in which NAND 91, which has been previously screwed onto reinforcing bars 92, is tightened using the tightening unit and NAND runner 8 according to the present invention for a joint pipe 9 that has threaded reinforcing bars 92 and 93 screwed together at both ends. It shows.

The tightening unit includes a NAND tightening socket gear 2, a transmission gear 3 for rotationally driving the socket gear 2, and an input gear shaft 4.
It consists of a unit main body 1 having a main body 1 and a reaction force receiver 5 rotatably attached to the main body 1.

The side walls 11 and 12 of the unit main body 10 are widely cut out from the lower end upwards in accordance with the diameter of the threaded reinforcing bar, and an opening 1 is formed.
3 is formed, and the upper end of the opening 13 is a semicircular hole 14.1.
4.

The unit main body 1 is opened from the opening 13 on both side walls and the bottom of the housing.
Screw joint reinforcing bars can be inserted.

A semicircular stopper 15, whose inner diameter is slightly larger than the maximum diameter of the threaded reinforcing bar 92, protrudes along an arc from the circular hole 14 in one side wall 110 of the unit body 1, and is removably screwed around the circular hole 14. .

A handle 16 is provided protruding from the upper part of the main body 1.

Inside the unit body 1, a socket gear 2 is rotatably arranged concentrically with the circular holes 14, 14 on the side wall.

The socket gear 2 is a cylindrical body having a toothed surface on the outer periphery and a tooth-shaped NAND engagement groove 23 on the inner periphery, and has convex portions 21 and 21 protruding in an annular shape on both end surfaces. ing.

The annular convex portion 21.21 is rotatably fitted into the circumferential grooves 17, 17 recessed on the inner surfaces of both side walls 11.12 of the main body 1, and a part of the cylindrical wall is cut out corresponding to the opening 13 of the main body 1. Open 22.

Above the socket gear 2 is a transmission gear 3 with a smaller diameter than that gear.
, an input gear shaft 4 having a smaller diameter than the transmission gear 3 is disposed above the transmission gear 3.
The transmission gear 3 is engaged with the socket gear 2 and the input gear shaft 4 to form a reduction gear mechanism using a spur gear train.

A knob 31 that protrudes outward from the side wall 10 to which the stopper 15 is fixed is fixed to one end of the transmission gear 3.
When the indicator 32 is attached to the socket 1 by turning the knob 31 and aligning the base line 33 of the indicator with the base line 34 provided on the side wall 11 as shown in FIG. The gear 2 is rotated so that the opening 22 of the gear 2 and the opening 13 of the unit body 1 are aligned with each other.

The input gear shaft 4 connects a rotating tool such as a manual wrench or an electric wrench to obtain input, and the shaft end has a protruding square shaft or a recessed square hole for engaging and disengaging with the rotating tool. The engaging portion of this embodiment is such that the electric NAND runner 8 shown in FIGS. 1 and 2 can engage from either end of the input gear shaft 40.

As is well known, the net runner 8 has a runner main body 81 whose tip end is formed into a polygonal cylinder 82, and a drive shaft 81 protrudes from the center of the cylinder 82.

The input gear shaft 4 has a through hole 41 at its axial center, and both ends of the hole 41 are formed into polygonal holes 42 that can be engaged with the drive shaft 83 of the NAND 2 inner 8.

At both ends of the input gear shaft 40, a presser plate 6 with a reaction force receiver 61 protruding from the center is screwed to both side walls 11.12 of the unit body 10, and both ends of the input gear shaft 4 are attached to each reaction force receiver 61. It is fitted so that it can rotate freely.

A polygonal engagement groove 62 into which the polygonal cylindrical body 82 of the NAND runner 8 is fitted is formed on the inner surface of each reaction force receiver 61 .

A reaction force receiver 5, which is a feature of the present invention, is pivotally supported on the side wall 12 opposite to the side wall 11 from which the knob 31 protrudes.

The reaction force receiver 5 has an engagement groove 5 on the lower surface in which the width across flats of the joint pipe 9 engages.
1 is opened downward, and the upper end is supported by a pivot shaft 52 approximately at the center of the side wall 12 and is rotatable within a plane perpendicular to a plane containing the central axis of the socket gear 2.

A clamp bolt 53 that penetrates the wire groove 51 is screwed into one side of the engagement groove 51 .

A handle 54 is provided to protrude outward from the upper part of the back surface of the reaction force receiver 5, and a locking pawl 55 that can swing within 500 rotations of the reaction force receiver is pivotally fixed to the base end of the handle 54.

The claw pieces 57 on both sides of the tip of the locking claw 55 are urged toward the ground by the spring 56, and the claw pieces 57, 57 are engaged with and disengaged from a pair of parallel guide plates 7, 7 protruding from the side wall 12, and the reaction force is applied. This is to maintain the upper rotational position of the receiver 5.

The guide plates 7, 7 are provided facing each other with the upper part of the reaction force receiver 5 interposed therebetween, and the reaction force receiver 5 is slidably fitted between the guide plates 7, 7.

As shown in FIG. 4, cutouts 71 and 72 are provided at the lower and upper ends of both guide plates 7, 7, and when the claw piece 57 of the locking claw 55 engages with the lower cutout, the reaction force receiver 5 is facing straight down, the engaging groove 51 is aligned on the same straight line as the axis of the socket gear 2, and when the claw piece 57 is engaged with the upper notch 72 as shown by the two-dot chain line, the reaction force receiver 5 is aligned with the socket gear 2. is held away from the axis of the

However, when using the tightening unit, the nuts 91.91 are screwed onto the two threaded reinforcing bars 92,93 in advance, the ends of the reinforcing bars are screwed into both ends of the joint pipe 9, and the nuts 91.91 are screwed onto the two threaded reinforcing bars 92,93. Tighten by hand or with a wrench to the extent possible to crimp both ends of the joint pipe 9.

At this time, as shown in FIG. 1, normally the phases of the joint pipe 9 and the numbers 91 and 91 do not match.

Next, the reaction force receiver 5 is lowered onto the threaded reinforcing bar 92 of the tightening unit held at the position indicated by the two-dot chain line in FIG. is moved in the axial direction to engage the nut 91 with the socket gear 2.

When the end face of the NAND 91 hits the stopper 15, that position is the normal tightening position, and the socket gear 2 of the unit body 1 is completely engaged with the NAND 91, but not with the joint pipe 9.

Pull the locking claw 55 of the reaction force receiver 5 against the spring 56, remove the claw piece 57 from the upper notch 72, rotate the handle 54 downward, and insert the joint pipe 9 into the engagement groove 51 of the reaction force receiver 5. Fit it.

Since the phases of the Nand 91 and the joint pipe 9 are often not the same, it is best to rotate the unit body 1 a little in the circumferential direction of the joint pipe 9 to align the engagement groove 51 and the joint pipe 9 and fit them. good.

In this case, socket gear 2, transmission gear 3, input gear shaft 4
Since both are spur gears, even if the unit body 1 is rotated, no rotational force is transmitted to the socket gear 2, so the unit body 1 can be rotated easily.

At the position where the reaction force receiver 5 and the joint pipe 9 are engaged, the claw piece 57 fits into the notch 71 in the lower part of the guide plate 7, and the reaction force receiver 5 maintains the engaged state with the joint pipe 9.

Tighten the clamp bolt 53 of the reaction force receiver 5 to fix the joint pipe 9 and the reaction force receiver 5.

Next, the drive shaft 83 of the NAND runner 8 is engaged with one end of the input gear shaft 4, the polygonal cylinder 82 of the NAND runner is fitted into the reaction force receiver 61, the NAND runner 8 is operated, and the input gear shaft 4. Rotate the socket gear 2 at a reduced speed via the transmission gear 3 and tighten the NAND 91.

Since the tightening reaction force acting on the NAND runner is received by the reaction force receiver 61, the runner main body 81 can be operated safely without rotating.

Tightening is completed when the NAND 91 rotates around 90° from the pre-tightened position, so the opening 22 of the socket gear 2 does not rotate 1800 degrees or 1 turn.

The reaction force generated when tightening the nut and the impact reaction force generated when the nut is tightened can be supported by the reaction force receiver 5 attached to the unit body 1 using threaded reinforcing bars as support, so the unit body fixed to the joint pipe 9 can be 1 does not rotate, and NAND 91 is firmly tightened.

After tightening the NAND, loosen the clamp bolt 53 of the reaction force receiver 5, pull the locking claw 55 of the handle 54 to disengage the claw piece 57 and the lower notch 71, and rotate the handle 54 upward. Remove the reaction force receiver 5 from the joint pipe 9.

Next, the tightening unit main body 1 is moved axially toward the reinforcing bar 92 to disengage the socket gear 2 and the nut 91, and the knob 31 of the transmission gear 3 is turned to set the indicator 32 and the scales 33 and 34 on the side wall 11 to their original positions. In other words, socket gear 2
The opening 22 of the unit body 1 is aligned with the opening 13 of the unit body 1, and the tightening unit is separated in the radial direction.

When the tightening unit is pulled away from the reinforcing bar 92, the socket gear 2 and the reaction force receiver 5 are in the state at the start of work, so the tightening unit is reversed and the tightening work of the other pair of NANDs 91 is started. Do the same as above.

As described above, in the present invention, since the reaction force receiver 5 is rotatably pivoted to the unit body 1, when the nut 91 is temporarily tightened,
Even if the NAND 91 and the joint pipe 9 are not in phase, it can be easily done by fitting the socket gear 2 into the NAND 91, slightly rotating the unit body 1 in the circumferential direction, and then rotating the reaction force receiver 5 toward the joint pipe 9. The reaction force receiver 5 and the joint pipe 9 can be engaged with each other.

This operation is carried out through the reaction receiver 5 via the guide plate 50 as in the conventional case.
It is much easier and faster than operating the .

In addition, since the transmission gear 3 is provided between the input gear shaft 4 and the gear 2, and the centers of the input gear 4 and the gear 2 are separated far apart, when the rotary tool is engaged with the input gear shaft 4, the threaded reinforcing bar 92 is It does not interfere with tool operation.

In addition, by linking the transmission gear 3 with a knob 31 that can be operated from the outside of the unit body 1, it is possible to easily align the openings 22 and 13 of the unit body 1 with the transmission gear 2, which has excellent practical effects. .

[Brief explanation of drawings]

Figure 1 is a slope view showing the usage condition, Figure 2 is Figure 1 ■-■
3 is a partially cutaway front view, FIG. 4 is an explanatory diagram of how the reaction force receiver and the guide plate are engaged and disengaged, FIG. 5 is a slope view showing a conventional example, and FIG. 6 is a partially cutaway front view. FIG. 5 is a sectional view taken along the line Vl-VI. 1...Unit body, 2...Socket gear, 3...Transmission gear, 4...Input gear shaft, 5...Reaction force receiver .

Claims (1)

[Claims for Utility Model Registration] ■ A unit main body 1 with an opening 13 on the lower surface, a circular structure rotatably arranged inside the unit main body 1, with a NAND engagement groove 23 on the inner peripheral surface and a tooth surface on the outer peripheral surface. A socket gear 2 having an opening 22 in which a threaded reinforcing bar is inserted at one location on the circumference;
An input gear shaft 4 is rotatably disposed on the upper part of the unit body 1 and has an engaging part that can be engaged with and detached from a rotating tool at its end, and is freely rotatably disposed between the input gear shaft 4 and the socket gear 2. A transmission gear 3 that meshes with the shaft 4 and the gear 2; a reaction force receiver 5 that is rotatably attached to the unit body 1 in a plane perpendicular to a plane containing the central axis of the socket gear 2 and has an engagement groove 51 at its lower end; A tightening unit for threaded reinforcing bars. ■ The input gear shaft 4 has a polygonal hole 42 at its shaft end into which the output shaft 83 of the rotary tool engages, and the unit body 1 has a reaction force receiver 61 into which the tip of the rotary tool body is fitted. 4. A tightening unit for threaded reinforcing bars according to claim 1 of the utility model registration claim, which protrudes concentrically with 4. (2) The tightening unit for threaded reinforcing bars according to claim 2 of the utility model registration claim, in which the polygonal hole 42 is opened at both ends of the input gear shaft 40 and the reaction force receiver 61 covers both ends of the input gear shaft 40. (2) The tightening unit for threaded reinforcing bars according to claim 1 or 2, wherein the transmission gear 3 is connected to a knob 31 that projects outward from the unit body 1. ■ The threaded reinforcing bar according to any one of claims 1 to 4 of the utility model registration claim, in which a stopper 15 is provided at one end of the opening 13 of the unit body 1 in line with the top surface of the nand to be tightened. Tightening unit for use. ■ An indicator 32 is attached to the knob 31, and the indicator 320 base line 33 and the unit body 10 base line 34
The tightening unit for threaded reinforcing bars according to claim 4, in which the respective openings 13 and 22 of the bent gear 2 and the unit body 1 correspond when they are aligned.