JP3068092U - Bolt tightening machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a one-side bolt to be tightened even when there is no protruding object around the one-side bolt receiving a reaction force. SOLUTION: This is a bolt tightening machine which fits a washer 8 having a hook receiving portion 81 on an outer peripheral portion and tightens a bolt 7 having a shearing tip 73 protruding from a head 72. An inner socket 1 to be fitted and an outer socket 2 to which the bolt head 72 fits in a conservative manner, concentrically,
Two output shafts of the planetary gear mechanism 3, whose rotational forces act in opposite directions, are connected to the sockets 1 and 2, and the outer socket 2 is engaged with a catch receiving portion 81 of the washer 8.
21 are formed. Washer 8 and outer socket 2
To make the washer 8 a reaction force receiver.

Description

[Detailed description of the invention]

[0001]

[Field to which the invention belongs]

 The present invention relates to a bolt tightening machine that fits a washer having a catch receiving portion and tightens a bolt having a shearing tip protruding from a head thereof.

[0002]

[Prior art]

 As shown in FIG. 5, a tightening machine (10) for tightening a torque control bolt (74) having a shearing tip (76) at the tip of a bolt shaft (77) engages with the shearing tip (76). It has an inner socket (1) and an outer socket (2) that engages with a nut (75) screwed into a bolt (74), with both sockets facing in opposite directions of a planetary gear mechanism (not shown). It is configured to be linked to two output shafts on which a rotational force acts. If a force greater than a predetermined tightening torque acts on the bolt (75), the chip (76) is sheared, and the tightening torque can be guaranteed.

When the bolt (7) provided with the shearing tip (73) on the spherical head (72) shown in FIG. 1 is tightened by the bolt tightening machine, the outer socket of the tightening machine is replaced. The replacement outer socket (2) is fitted with the head (72) of the bolt (7) in a state where there is a margin in the rotation direction, and receives a reaction force perpendicular to the socket axis as shown by a two-dot chain line. (25) is protruding.

[0004] The head (72) of the bolt (7) is fitted into the outer socket (2), the shearing tip (73) is engaged with the inner socket (1), and the reaction force receiver (25) of the outer socket (2) is engaged. ) Against peripheral protruding objects such as bolts to prevent rotation, and rotate the inner socket (1) alone to shear the chip (73).

[0005]

[Problems to be solved by the invention]

 When tightening the bolt (7) provided with the shearing tip (73) on the head, there is a problem that if there is no suitable protrusion for applying the reaction force receiver (25), the bolt cannot be tightened. The present invention clarifies a tightening machine that can solve the above problem.

[0006]

[Means to solve the problem]

 In the bolt tightening machine of the present invention, a washer (8) having a hook receiving portion (81) is fitted on an outer peripheral portion, and a bolt (7) having a cutting tip (73) protruding from a head (72) is tightened. A planetary gear mechanism, comprising: a bolt tightening machine, comprising an inner socket (1) engaged with a shearing tip (73) and an outer socket (2) into which a bolt head (72) fits with a margin. The two output shafts of (3) in which rotational forces act in opposite directions are connected to both sockets (1) and (2), and the outer socket (2) has a catch receiving portion (81) of a washer (8). An engaging portion (21) is formed to engage with the second member.

[0007]

[Action and effect]

 A washer (8) is fitted to the bolt shaft portion (71), and is screwed by hand to the mating tightening members (9) and (91). Next, the shearing tip (73) is fitted into the inner socket (1) of the tightening machine, and the engaging portion (21) of the outer socket (2) and the catch receiving portion (81) of the washer (8) are engaged. Is engaged, and the tightening machine is operated by pressing the tightening machine against the mating tightening member (9).

[0008] Since frictional resistance is exerted on the outer socket (2) by pressing against the washer (8) or the mating tightening member (9), only the inner socket (1) rotates and the bolt (7) is rotated. tighten. Immediately before the bolt (7) is closed, the washer (8) is pinched between the bolt head (72) and the mating tightening member (9), and is rotated by the washer (8) due to strong frictional resistance. It does not rotate even when force is applied. Accordingly, the rotation of the outer socket (2) engaged with the catch receiving portion (81) of the washer (8) is also prevented, and only the inner socket (1) rotates, and a force exceeding a predetermined torque is applied to the bolt (7). ), The shearing tip (73) is sheared.

As described above, since the tightening reaction force acting on the outer socket (2) is received by the washer (8) inserted through the bolt (7), a projecting object receiving the reaction force around the bolt to be tightened is formed. Even if it does not exist, the bolt (7) can be tightened. Also, when the reaction force receiver (25) is protruded from the outer socket (2) as in the conventional case, the weight increases by the amount of the reaction force receiver (25), and the reaction force receiver (25) is also tightened by the tightening machine. However, this inconvenience can be solved, although the operability is degraded because of the obstacles in handling.

[0010]

[Embodiment of the invention]

 As shown in FIG. 1 and as described above, the bolt 7 for fastening the members 9 and 91 has a shearing tip 73 on the spherical head 72 as shown in FIG. A plurality of ridges (73a) are formed on the outer peripheral surface of the shearing tip (73) along the axial direction.

The washer (8) fitted to the shaft portion (71) of the bolt (7) is provided with notches (81a) at equal intervals on the outer peripheral portion to engage an outer socket (2) of a bolt tightening machine described later. The hook receiving portion (81) is engaged with the portion (21). The catch receiving portion (81) is located outside the head (72) with the washer (8) abutting against the bearing surface of the bolt head (72).

As shown in FIG. 2, the bolt tightening machine basically has a known structure, and will be described briefly. Of the two output shafts of the planetary gear mechanism (3) built in the housing (4) in which rotational forces act in opposite directions, the inner socket (1) is connected to the output shaft rotating in the bolt tightening direction. And slidably engage with each other and slidably in the axial direction. The other output shaft is detachably fixed to a holding cylinder (41) rotatably projecting from the housing (4).

A handle (6) protrudes from the base end of the housing (4) substantially orthogonal to the housing (4), and a motor (5) is mounted substantially parallel to the handle (6). The rotating shaft of the motor (5) is connected to the input shaft of the planetary gear mechanism (3) via a gear train (31).

The inner socket (1) is provided with an engaging hole (71) for engaging with the shearing tip (73) of the bolt (7).

As shown in FIG. 3, the outer socket (2) is provided with a flange (23) projecting from an outer periphery of an intermediate portion of a cylindrical portion, and cutout portions (24) are formed at a plurality of positions of the flange (23) at equal intervals. Has been established. The base end side of the outer socket (2) from the flange (23) is a fitting tube portion (22) that fits into the holding tube (41).

A feature of the present invention is that a housing cylinder portion (20) in which the bolt head portion (72) fits in a state where the bolt head portion (72) has a margin in the rotation direction on the tip side from the flange (23) of the outer socket (2), The point that an engaging portion (21) that engages with the catch receiving portion (81) of the washer (8) is formed on the distal end surface of the portion (22). The engaging portion (21) of the embodiment is a protruding piece (21a) that fits into the notch (81a) that is the catch receiving portion (81).

The fitting cylinder (22) of the outer socket (2) is fitted into the holding cylinder (41) of the bolt tightening machine, and the claw (43) protruding from the tip of the holding cylinder (41) is connected to the outer socket. Engage the notch (24) formed in the flange (23) of (2), and secure the outer socket (2) with the clamp screw (42) screwed to the holding cylinder (41).

In FIG. 1 and FIG. 2, a protruding pin (11) fitted to the axis of the inner socket (1) strikes a shearing tip (73) of a bolt sheared in the inner socket (1). It is a known protruding pin (11) for taking out.

However, as shown in FIG. 1, the washer (8) is fitted to the bolt shaft portion (71), and the member (9) on the near side of the mating tightening members (9) (91) stacked in two pieces. Pass through the through hole (92), turn it into the screw hole (93) of the back member (91), and temporarily tighten it with a torque wrench or the like.

Next, the shearing tip (73) is fitted into the inner socket (1) of the tightening machine, and the engaging portion (21) of the outer socket (2) and the catch receiving portion (81) of the washer (8) are fitted. Are engaged, and the tightening machine is operated by pressing the tightening machine against the mating tightening member (9). Since frictional resistance is exerted on the outer socket (2) by pressing against the mating fastening member (9), only the inner socket (1) rotates to tighten the bolt (7).

Immediately before the closing of the bolt (7), the washer (8) is pinched between the bolt head (72) and the mating tightening member (9), and a strong frictional resistance is applied. ), The washer (8) does not rotate. Accordingly, the rotation of the outer socket (2) engaged with the catch receiving portion (81) of the washer (8) is also prevented, and only the inner socket (1) rotates, and a force exceeding a predetermined torque is applied to the bolt (7). ), The shearing tip (73) is sheared.

As described above, the tightening reaction force acting on the outer socket (2) is received by the washer (8) inserted through the bolt (7), so that a projecting object receiving the reaction force around the bolt to be tightened. Even if it does not exist, the bolt (7) can be tightened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bolt and a tightening machine before tightening.

FIG. 2 is a sectional view of a bolt and a tightening machine during tightening.

FIG. 3 is a perspective view of an outer socket.

FIG. 4 is a perspective view of a bolt and a washer.

FIG. 5 is a front view in which a part of a conventional torque control bolt and a bolt tightening machine are cut away.

[Explanation of symbols]

 (1) Inner socket (2) Outer socket (21) Engagement part (3) Planetary gear mechanism (8) Washer (81) Hook receiving part

Claims (2)

[Utility model registration claims] A washer (8) having a catch receiving portion (81).
A bolt with a shearing tip (73) protruding from the head (72)
A bolt tightening machine for tightening (7), comprising a shearing tip.
Inner socket (1) and bolt head (72) engaging with (73)
Outer socket that fits in a state where there is room in the rotation direction
(2) is concentrically connected, and two output shafts of the planetary gear mechanism (3) to which rotational forces act in opposite directions are connected to both sockets (1) and (2), and a washer (2) is attached to the outer socket (2). 8) A bolt tightening machine comprising an engaging portion (21) for engaging with the catch receiving portion (81). 2. The catch receiving portion (81) of the washer (8) is a notch (81a) in which the outer peripheral edge of the washer (8) is cut out at equal intervals, and the engaging portion of the outer socket (2) is provided. (21) is the notch (8
2. The bolt tightening machine according to claim 1, wherein the bolt is a protruding piece that fits into 1a).