JPH01183376A - Bolt/nut fastening device - Google Patents

Abstract

PURPOSE:To easily detect a rotational quantity of a nut by providing a detecting rod capable of being axially shifted according to a fastening quantity due to the output shaft of a differential speed reducer. CONSTITUTION:As a nut N is started for operation, a detecting rod 51 incorporated in an output shaft 48 is axially shifted according to a relative rotational angle between an input shaft 41 and output shaft 46 of a planetary gear 4. A rotational angle of the nut N is detected based on the movement quantity to control rotational movement of a socket 62. Next, when the fastening of the nut is completed, a fastening quantity control mechanism 70a of a clutch controller 70 is operated through the backward movement of the detecting rod 51 to release engagement of the clutch 7 and cut off a switch 36 of a rotational driving device and therefor rotation of the socket 62 is stopped. Besides, in the case of applying excessive load on the nut, an excessive load control mechanism 70b of the clutch controller 70 is operated by backward movement of a clutch plate 74 to release engagement of the clutch 7 and cut off the switch 36.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bolt/nut tightening tool, and the present invention relates to a bolt/nut tightening tool, in which an overload occurs during the movement and tightening of a rod that moves in the axial direction corresponding to the amount of tightening of the nut. Sometimes, the rotary drive device is stopped and the power is cut off.

(Prior art and its problems) In a bolt/nut tightening tool that measures and controls the tightening torque, the rotation angle of the nut, or the amount of movement of the nut when tightening the bolt/nut, the power supply to the motor is controlled. If only the bolts are tightened, the inertia of the motor will cause the bolts to be overtightened, and the bolt nuts and the sockets that fit into them will become jammed, causing trouble in the work.

For fasteners that measure and control things other than tightening torque, such as the rotation angle of the nut or the amount of movement of the nut, an overload prevention mechanism must be provided in case an overload is applied.

Overload prevention mechanisms include shear pin type, cam type, etc.

Since the shear pin system shuts off the shear bin due to overload, it is necessary to replace the shear bin each time it is activated.

The cam method presses a steel ball against an inclined cam and cuts off the power when the steel ball climbs over the inclined surface.
Both systems have problems such as requiring a return operation every time they are activated, or being unable to shut them off completely and causing vibrations, so there is room for improvement in both systems.

(Means for Solving the Problems) The present invention moves a detection rod built into the output shaft in the axial direction according to the relative rotation angle between the output shaft and the input shaft to which sockets are connected, and Reveals a bolt/nut tightening tool that can stop the rotary drive device and cut off power transmission according to the situation, as well as stop the rotary drive device and cut off power transmission when overload occurs during tightening. It is something to do.

The bolt/nut tightening tool of the present invention includes a socket drive device 63 that drives a socket (62) via a clutch (7) and a differential reduction gear to a rotation drive device such as a motor (13).
), a detection rod (51) that moves in the axial direction according to the amount of tightening by the output shaft (46) of the differential reduction gear, and a clutch (7) due to the backward movement of the rod and overload on the output shaft. ), the clutch (7) is disposed concentrically with the input shaft (41) and freely rotates independently of the rotation of the input shaft, and is connected to a rotational drive device. The body ()l) is mounted on the input shaft (41) so as to be able to rotate integrally with the shaft and to be able to slide on the shaft, and is biased toward the rotating body by a spring (76), and inputs the rotation of the rotating body (71). A clutch plate (74) that transmits transmission to the shaft (41), and a spring (78) that biases the clutch plate in a direction away from the rotating body (71).
), a rotating body (71) and a clutch plate (74).
) are provided with protruding mountain teeth (75) that can mesh with each other, and the clutch control device (70) is activated by the backward movement of the detection rod (51) to disengage the clutch (7). At the same time, the tightening amount control mechanism (70a) turns off the switch (36) of the rotary drive device, and the teeth of the rotating body (71) and the clutch plate (74) due to the load acting on the clutch.
an overload control mechanism (70b) which operates when the slope of 5) slides and the clutch plate (74) retreats to release the engagement of the clutch (7) and turn off the switch (36) of the rotary drive device; Consists of.

(Operations and Effects) Since the amount of rotation of the nut is detected by mechanical means of moving the detection rod, the structure is simple and the operation is reliable.

In addition, the clutch is disengaged when the nut is tightened or overloaded, and the rotation of the rotary drive device is not transmitted to the socket (62). Over-tightening of the nut is prevented, and the rotation angle can be controlled with little error.

Furthermore, the overloaded side socket will not rotate, and no force will be applied when tightening.

(Example) As shown in Fig. 1, the fastener connects the output shaft (46) of a differential reduction gear such as a planetary gear mechanism (4) to a socket (62),
After the reaction force receiver (6) idles until it hits an adjacent member (not shown), the input shaft (41) of the planetary gear mechanism (4) starts rotating when the socket starts rotating the nut N that fits into it.
The detection rod (51) built into the output shaft (46) is moved in the axial direction according to the relative rotation angle (hereinafter referred to as relative rotation angle) between the output shaft (46) and the output shaft (46), and the nut is The rotation angle of N is detected and the rotation of the socket (62) is controlled.

In the planetary gear mechanism (4), in order to input an input torque to the input shaft (41) and obtain an output from the output shaft (46), the relationship between the rotation angles of the input shaft and the output shaft at this time is determined by the reduction ratio. i, input shaft rotation angle is R1, output shaft rotation angle is R1
Then, R,=iRi...■.

Also, if the relative rotation angle between the input shaft and output shaft is ΔR, then ΔR"' R+ -Rs ・・・・・・■
Therefore, by substituting the formula 0 into this, ΔR=(i 1) R3...■. Therefore R
ko is R, = ΔR/(i-1) . . . Φ.

Since the reduction ratio i is a constant and is known in advance, it can be seen that the output shaft rotation angle R1 can be determined from the relative rotation angle ΔR. As described above, this fastener converts the rotation angle of the output shaft into the axial movement amount of the detection rod (51) built into the output shaft, and indirectly detects the output shaft rotation angle based on the movement amount. It is something.

This fastener consists of a power part (1) and an output part (3), and a handle part (12) is provided protruding from the case (11) of the power part (1), and the case and the output part (3) The cases (31) are rotatably connected to each other around the input shaft (41) of the planetary gear mechanism (4).

The power unit (1) includes a motor (13), a clutch (7) that transmits and disconnects the rotation of the motor to the input shaft (41) of the planetary gear mechanism (4), and the operation of the clutch and the motor (13).
A trigger (9) is provided to control energization.

In the detailed explanation and operation explanation of each part below, the front,
The front side is the socket (62) side, and the rear, rear side, and rear side are the handle (12) side.

Direct pressure 1 to 1 Planetary gear mechanism (4) installed in the milk suction unit case (31)
is an input shaft (41), an output shaft (46) disposed concentrically with the input shaft (41), a sun gear (44) on the input shaft (41) supported by the output shaft (46), and an output shaft. Part case (
31) and an idle gear (45) that meshes with internal teeth (40) formed on the inner surface of the gear.

The input shaft (41) rotatably penetrates the rear wall of the output part case (31) and the front wall of the power part case (11), projects into the case, and connects to a shift gear (72) to be described later in the projecting part. An interlocking spline (49) is formed.

A socket (62) is fitted to the tip of the output shaft (46) so as to be able to rotate integrally with the shaft (46), and the socket drive device (63) is driven by the motor (13), clutch (7) and planetary gear mechanism (4). ) is formed.

A detection rod (51) is slidably arranged across the axes of the input shaft (41) and the output shaft (46), and the detection rod (51)
) is biased toward the socket (62) by a spring (54).

The power part (1) side of the detection rod (51) is formed into a square shaft (52), and is fitted into the square through hole (42) of the input shaft (41) so as to be slidable and rotatable together with the input shaft (41). The outer periphery of the other end forms a spiral strip (53), and the spiral strip (53)
) is slidably fitted into the through hole (47) of the output shaft (46). As shown in Figures 1 and 10, the output shaft (4
6) is partially cut out approximately in the center, and the cutout portion (48)
A gear (55) is rotatable in a plane including the axis of the detection rod (51) and meshes with the spiral thread (53) of the detection rod (51). It is made to appear outside. As shown in Figures 1 and 6, the output shaft (4
A sleeve (5)) which is pressed to the left by a spring (59) and a ring-shaped conical cam (5) are located on the outer periphery of the approximately central part of 6).
The sleeve (5)) has a notch (58) wide enough to allow the gear (55) to freely rotate in a part of its cylindrical portion, and the output shaft (46) ) is allowed to enter the gear (55) that is protruding from the top.

A screw shaft-shaped stopper (30) for regulating the forward end of the detection rod (51) is screwed onto the tip of the output shaft (46).

The detection rod (51), gear (55), conical cam (5)
6) The sleeve (57) and the spring (59) constitute a detection rod moving device (5).

As shown in FIGS. 1 and 8, the outer periphery of the output part case (31) on the front end side is formed with a small-diameter spline cylinder shaft (32), and a spline shaft hole (61) is formed in the spline cylinder sleeve (32). The cylindrical reaction force receiver (6) is fitted with some play.

In addition, a torsion spring (33) is arranged between the reaction force receiver (6) and the output part case (31), and in this embodiment, the power part (1)
Rotate and bias the reaction force receiver (6) in the counterclockwise direction when viewed from the ) side, so that the sides of the peaks and valleys of the splines to which the reaction force receiver (6) and the output part case (31) are fitted are in contact with each other. It's stopped. Spline sleeve (32) of output part case (31)
Through holes (34) are provided in the valley at equal intervals in the cylindrical direction, and each through hole (34) is provided with a ball (35).

The ball (35) is pushed outward in the radial direction along the through hole (34) by the conical cam surface (56m) of the conical cam (56), which is pressed by the spring (59); It stops against the inner surface of the spline shaft hole (61) of the force receiver (6) (Fig. 8).

There is a protrusion (60) at the tip of the reaction force receiver (6) to receive the reaction force.
is provided, and when tightening the nut, the protrusion (60
) hits an adjacent nut or member and receives a reaction force.

As shown in Figure 1, the input shaft (41) is located in the power section (1).
) and a rotating body (
71) is provided, and a shift gear (72) is provided on the input shaft (41) so as to be rotatable integrally with the input shaft (41) and movable in the axial direction by spline connection.

A bevel gear (83) is formed on the outer periphery of the rotating body (71), and the bevel gear (83) meshes with a bevel gear (14) protruding from the rotating shaft (13a).

On the shift gear (72) by spline connection.

Can be rotated integrally with the shift gear (72) and can be rotated integrally with the shift gear (72).
) A clutch plate (74) is provided so as to be movable in the axial direction independently of the axial movement of (2).

A clutch plate (
Ring-shaped retaining part (72a) that prevents 74) from escaping
is formed.

As shown in FIGS. 20, 21, and 22, the opposing surfaces of the rotating body (71) and the clutch plate (74) are provided with a plurality of radially extending toothed teeth (5), 3 in the embodiment. A mountain-shaped toothed portion (75) of the strip is provided in a protruding manner, and the side surface of the toothed portion in contact with the mating toothed portion is twisted to form a twisted slope (75 m).

The surface (75b) on the opposite side of the twisted slope (75a) is formed into a slope.

A clutch case (3) is disposed concentrically with the input shaft (41) in the power unit (1) so as to be slidable in the axial direction, and the base end of the shift gear (72) is rotatably fitted into the case. In other words, the detection rod (51) passes through the bottom surface of the clutch case (73).

Also, inside the clutch case (73) is a clutch plate (74).
A spring (76) is provided that biases the shift gear (72) toward the retaining portion (72a).

Further, a spring (78) for retracting the shift gear (72) is provided on the input shaft (41), and when the fastener is in a stopped state, the rotating body (71) and the clutch plate (74) are The teeth (75) do not mesh and the clutch (7) is in a disengaged state.

A torque detection shaft (77) is slidably disposed in the power unit case (11) parallel to and above the input shaft (41).

The torque detection shaft (77) has its tip facing the back surface of the rotating body (71), is urged outward by a spring (9), and is in contact with the free end of a latch kicker (8) to be described later.

As shown in Figures 25 and 26, the first link (81) is connected to the rear of the clutch case (73) via the first pivot (81m).
is arranged to be swingable in a vertical plane, and the first link (81
) at the tip of the second link (82a) via the second pivot (82a).
2) are pivotally connected, and the other end of the second link (82) is connected to a positioning pivot (82b) disposed at a fixed position in the power unit case (11).
) are pivotally connected.

The ends of the first pivot (81m) and the second pivot (82a) protrude outward, and when the protrusion of the second pivot (82m) is pressed downward by a latch (2) to be described later, as shown in FIG. Thus, the first link (81) and the second link (82) are aligned in a straight line, allowing the clutch case (73) to move forward.

As shown in Fig. 25, the first link (81) has a second link (
A contact piece (81) that engages with the abutment piece (82) to prevent both links from rotating downward when they are aligned in a straight line.
b) is formed.

A rattsuki tsuka (8) is provided straddling the first axis (81m) and second axis (82m) of the first link (81) in a zero-shape. Pivot the end (
8a), it is arranged so as to be rotatable in a vertical plane in the front-rear direction within the power unit case (11).

The swing of the latch kicker (8) causes the first pivot (81a
) and the second pivot (82a) can be pushed back and forth.

Mount the latch (2) on one side plate of the latch kicker (8).
A protruding piece (80) that can come into contact with the front edge of the is provided to protrude rearward, and an arm piece (8C) is provided on the other side plate to protrude rearward, and the tip of the arm piece (8C) is attached to the inside. Bend it to
8d). - As shown in Figure 1, the handle part (12) has a motor (1
3) a switch (36) and a trigger (9) for actuating the switch are provided.

The switch button (3) of the switch (36) is pressed by the spring (3).
8).

Above the switch (36) a trigger (9) is arranged rotatably in a vertical plane by means of a pivot (9a).

The latch (2) is disposed at the tip of the trigger (9) so as to be swingable in a vertical plane by means of a pivot (2a).
2) has a hook (21) protruding forward from its free end. The hook (21) engages with and disengages from a protrusion of a second pivot (82a) that pivotally connects the first link (81) and the second link (82).

A sub-trigger (91) is disposed inside the finger catch part (9b) of the trigger (9) so as to be rotatable in a vertical plane about the pivot (9a), and the sub-trigger (91)
`` hits the switch button (37), and a compression spring (92) is inserted between the trigger (9) and the sub-trigger (91).
) is interposed.

The compression spring (92) has a weaker biasing force than the spring (38) which biases the switch button (3) outward.

As shown in Figures 1 and 23, a slide plate (93) is provided on the top surface of the trigger (9) so as to be slidable in the front and back direction, and a long hole (93a) is provided in the slide plate (93) in the longitudinal direction. Then, the bolt (93b) was slidably fitted into the long hole (93m).
) prevents the slide plate (93) from coming off the trigger (9).

The slide plate (93) is urged forward by a compression spring (94), and a pressing piece (95) capable of pressing the latch (2) is provided at the front end of the slide plate (93), and a pressing piece (95) capable of pressing the latch (2) is provided at the front end of the slide plate (93). has a mounting piece (93c) protruding upward, and the mounting piece (93c)
3c), a sub-trigger locking block (96) is fixed so as to be positionable in the front-rear direction.

The locking block (96) is attached to the mounting piece (93c) by a bolt fitted into the long hole (96a) so that it can be positioned forward and backward by the allowance of the long hole (96a), and the locking block (96) is attached to the pro An L-shaped hook piece (961+) is provided protruding from the top.

The hooking piece (96b) is connected to the sub-trigger (91).
It is removably caught on a short projecting piece (91 m) protruding rearward from near the pivot point of the.

As described below, the detection port/rad (51) is formed by the detection rod (51), latch/lock (8), clutch (2), clutch ()), trigger (9), and sub-trigger (91). It constitutes a tightening amount control mechanism (70a) that disengages the clutch (7) and turns off the switch (36) of the rotary drive device by moving backward.

In addition, as described later, the clutch (7) is
The torque detection shaft (7
7) constitutes an overload control mechanism (70b) that disengages the clutch (7) and turns off the switch (36) of the rotary drive device by the f & retreat movement.

Tightening amount control mechanism (70m) and overload control mechanism (70b)
Clutch control device 11 (70) is configured.

The operation of the above-mentioned fastener will be explained.

(Fig. 1, Fig. 12, Fig. 13) First, the socket (62) is fitted into the nut N. At this time, the protrusion (60) of the reaction force receiver (6) does not touch any adjacent member or nut, and there is play in the fit between the socket (62) and the nut.

Next, pull the trigger (9) to the right as shown in Figure 12.

As the trigger (9) is pulled, the latch (2) pivotally connected to the free end of the trigger (9) is lowered and the latch (2)
2), the latch kicker (8) rotates slightly forward about the pivot (8a).

The latch kicker (8) hit the first axis (81m),
Move the clutch case (3) forward. Therefore, the clutch plate (74) moves forward while compressing the spring (78),
At the same time as it engages with the rotating body (71), the hook piece (
21) presses the second pivot (82m) from above.

At this time, the latch (2) pushes the slide plate (93) backward against the spring (94) and rotates slightly backward around the pivot (2a), but the latch (2) is not caught by the locking block (96). Piece (96b) and protruding piece (91m) of sub-trigger (91)
The engaging part of the sub-trigger (91) is not disengaged, and the sub-trigger (91) rotates counterclockwise around the pivot (9a) together with the trigger (9), and presses the switch button (37) to release the switch (36).
) to start the motor (13).

When the trigger (9) is further pulled, the latch (2) pulls down the second pivot (82m) to make the first link (81) and the second link (82) straight, thereby connecting the clutch plate (74) and the rotating body. (71) is in a completely meshing operation state.

・No. (Figures 1 to 11) Clutch (
7) are engaged and the motor (13) starts, the input shaft (41) starts to rotate clockwise when viewed from the motor (13) side, but the output case (31) is not receiving any reaction force. Therefore, the socket (62) does not rotate, and the output case (31) and the reaction force receiver (6) begin to rotate counterclockwise when viewed from the input shaft (41) side.

Also, since the detection rod (51) rotates together with the input shaft (41), the gear ( 55) rotates like a worm wheel.

The output part case (31) continues to idle together with the reaction force receiver (6), and finally the protrusion (6o) of the reaction force receiver (6) hits the adjacent nut N, and the nut N and socket (62) are fitted together. There is no more play, and the reaction force receiver (6) stops.

However, since the output part case (31) tries to continue rotating further, while twisting the torsion spring (33), the output part case (31) and the reaction force receiver (6) are fitted into the spline shaft hole (61). ) and the spline sleeve sleeve (32) will still rotate by the amount of play in the fit between the peaks and valleys.

At this time, as shown in Fig. 9, the ball (35) that had stopped against the inner surface of the spline shaft hole (61) of the reaction force receiver (6)
) can move to the outside, that is, into the play space of the spline, and the conical cam (5) that was pushing the ball (35)
6) and the sleeve (57) begin to move forward due to the bias of the spring (59), and as shown in FIG. 5
8m') gets caught in the teeth of the gear (55), and the gear (5
5) Stop the rotation.

At the same time, the spline shaft hole (61) into which the reaction force receiver (6) and the output part case (31) fit are in contact with the sides of the peaks and valleys of the splines of the spline cylinder shaft (32), causing the output part case (31
) receives a reaction force, the output shaft (46) begins to rotate and tightens the nut. Also, at this time, the detection rod (51) that meshes with the gear (55) compresses the spring (54) depending on the relative rotation angle of the input shaft (41) and the output shaft (46), as if pulling out a screw from screw 6. Move to the power section (1) side.

The cooler extends from the mouth and door to the motor L (first
(Fig. 5, Fig. 16, Fig. 17) When the detection rod (51) moves back in accordance with the amount of tightening of the nut, the rear end of the rod touches the abutting plate (
8d) and rotate the latch kicker (8) in the f& direction.

As a result, the latch (2) in contact with the latch kicker (8) falls backward, the slide plate (93) on the trigger (9) retreats against the spring (94), and the slide plate (
93) The hooking piece (96) of the locking block (96) at the end of 71
b) The engagement portion between the protruding piece (91m) of the sub-trigger (91) gradually shifts.

Furthermore, when the nut N is tightened and the detection rod (51) moves backward, the hook (21) of the latch (2) is disengaged from the second pivot (82m) and the clutch plate (74) is disengaged due to the resistance of the spring (78). ) moves rearward, and the clutch (7) is disengaged from the rotating body (71), and at the same time, the locking block (96) and the sub-trigger (91) are disengaged, and the switch button is disengaged. The sub-trigger (91) rotates forward due to the drag force of the spring (38) of the switch (37).
) is turned OFF and the motor (13) stops (see Fig. 16).

As shown in Figure 17, if you release the pressure on the trigger (9),
The trigger (9) is rotated by the spring (92), and the hooking piece (96b) of the locking block (96) engages with the sub-trigger (91) again, returning to the state shown in FIG.

- When the clutch (7) is disengaged, the input shaft (41) stops rotating and the output shaft (46) also stops rotating and does not output any output, completing the tightening of the nut. In addition, the output part case (31) is no longer subjected to reaction force and is rotated to the initial state by the torsion spring (33), so that the ball (35) is attached to the spline of the reaction force receiver (6) as shown in Figures 4 and 8. It is pushed down toward the shaft center by the inner surface of the shaft hole (61). - When the ball (35) is pushed down toward the axis, the conical cam (56) and sleeve (57) compress the spring (59) while compressing the power part (1).
) side, and the stop part (58m) of the notch (58) of the sleeve (5)) disengages from the gear (55).
The gear (55) can rotate freely. This allows the gear (
The detection rod (51) meshed with the shaft (55) is now able to move in the axial direction, and moves toward the socket (62) while rotating the gear (55) due to the drag force of the spring (54), as shown in Figure 5. returns to the initial position.

Nut 4-; The rotation angle of the nut N is set by changing the moving distance of the detection rod (51). In other words, the rotation angle of the nut N is set by changing the moving distance of the detection rod (51). By changing the initial position of the detection rod (51), the distance from when the detection rod (51) starts moving to when the clutch (7) is operated is changed.
Since the amount of movement of 1) is proportional to the product of the relative rotation angle of the output shaft (46) and input shaft (41) and the lead of the spiral thread (53) of the detection rod (51), the rotation angle of the nut is determined by the stopper (
30) shows that it can be set.

When using a bolt/nut tightener, if the nut is not engaged with the output shaft (46), the reaction force receiver (6) is fixed to receive the reaction force, and the input shaft (41) is rotated, the output Although the shaft (46) rotates, it does not receive the same load, so there is no reaction force that the output case (31) should receive, and therefore the sleeve (57) and gear (55) remain disengaged. The gear (55) rotates as the detection rod (51) rotates, and the detection rod (51) does not move in the axial direction.

That is, since the detection rod (51) moves only while the output shaft (46) is actually rotating the nut, the rotation angle of the nut corresponds to the amount of movement of the detection rod (51). ) The nut can be tightened appropriately by detecting the amount of movement.

- When the motor (13) is stopped (Figures 13 and 14) As mentioned above, the motor is started by operating the trigger, but when the clutch (7) is disconnected and the motor (13) stops, the rotating body ( 71) and the peaks of the mountain-shaped teeth (75) of the clutch plate (74) are opposed to each other, and the clutch (7) may not engage even if the trigger (9) is pulled.

At this time, the clutch is engaged by one movement as shown in FIGS. 13 and 14.

That is, when the trigger (9) is pulled as shown in Fig. 13 from the stopped state shown in Fig. 1, the clutch plate (74) and the rotating body (
If the tops of the chevron-shaped tooth portions ( ) 5) of the latch 71) are opposed to each other, they will not mesh with each other. In this case, the latch kicker (8) will be prevented from tilting forward. Therefore, as the trigger (9) is pulled, the latch (2) is pushed by the latch kicker (8), falls backward and descends, pushing the pressing piece (95) that is in contact with the latch (2), which causes the slide plate ( 93) and retract the locking block (96).

In this state, the hooking piece (96) of the locking block (96)
b) and the protruding piece (91a) of the sub-trigger (91) remain engaged, so the sub-trigger (91) is connected to the trigger (
The motor (13) is started by pressing the switch button (37) and turning on the switch (36), and the rotation # (71) starts rotating.

By further pulling the trigger (9), the latch (2)
falls further backward, moves the pressing piece (95) and the locking block (96) backward eight times, and finally the locking block (96)
) and the protruding piece (91a) of the sub-trigger (91) disengage, and the sub-trigger (91) rotates clockwise due to the drag of the spring (38) of the switch button (37). The switch (36) turns OFF and the motor (
13) stops, and the rotating body (71) also stops (131st
21).

Since it is an instant for the above-mentioned motor to turn ON and then OFF, the motor (13) only makes one movement, so the rotating body (71) rotates slightly and then stops, forming a mountain shape. The position of the tooth portion (5) is shifted.

When the pressure on the trigger (9) is released, the trigger (9) is rotated by the spring (92) (see Fig. 14), and the hook piece (96b) of the locking block (96) projects against the sub-trigger (91) again. It engages with the piece (91a) and returns to the state shown in FIG. In this state, the rotating body (71) and the clutch (74)
) are out of phase, and when the trigger (9) is pulled again, the chevron-like teeth (5) engage as shown in FIG. 12, and the engine can be started.

(Depends on the art) (Fig. 18, Fig. 19) Next, the function of disengaging the clutch and stopping the motor when the transmitted torque reaches a predetermined level in the operating state will be explained.

The rotating body (71) and the clutch plate (74) are provided with mountain-shaped teeth (5) at several locations, three in the embodiment, which mesh with each other and transmit torque, and as shown in FIG. Teeth (7
A tangential force corresponding to the transmitted torque is applied to each of the twisted slopes (75a) of 5), creating an axial component force that presses the clutch plate (74) rearward.

For this reason, the spring (76
) When an axial component of force larger than the drag force is generated, the clutch plate (74) moves rearward while compressing the spring (6).

Further, as the clutch plate (74) moves backward, the latch kicker (8) is pushed backward via the torque detection shaft (77) and falls down.

Figure 18 shows a state in which the clutch plate (74) has begun to move backwards, and the latch kicker (8) has fallen backwards.
The latch (2) is about to come off the second pivot (82M), and
The engagement between the hooking piece (96b) of the locking block (96) and the protruding piece (91m) of the sub-trigger (91) begins to disengage.

Furthermore, the clutch plate (74) moves backward while compressing the spring (76), and finally, as shown in FIG.
) is disengaged from the second pivot (82m), and the clutch (7) is disengaged. At the same time, the engagement between the locking block (96) and the sub-trigger (91) is disengaged, and the switch button (37) is moved by the spring (38). , and the switch (36) is OFF.
F and the motor (13) stops.

Further, the compressed spring (76) returns to its original length, and the clutch case (73) moves back to the state shown in FIG. 13.

When the pressure on the trigger (9) is stopped, the trigger (9) is rotated by the spring (92) (see Fig. 19), and the catch piece (96b) of the locking block (96) is moved again to the sub-trigger (91). , and returns to the state shown in FIG.

The transmitted torque when the clutch (7) is disengaged is determined by the spring (
) 6), so the spring (76)
By replacing the , the cutoff torque can be adjusted freely.

As described above, in the embodiment, since the control for the socket (62) of the fastener can be operated mechanically, it can be applied to all bolt/nut fasteners regardless of the power source, and can be applied to dog clutches. By adding a load prevention function, the power transmission capacity is large, and if an overload is applied, the socket will stop rotating, and the mechanism will not be strained.

In addition, when the apexes of the meshing teeth of the clutch stop facing each other, by operating the trigger, the motor can be moved by one movement to shift the position of the meshing teeth, making it possible to ensure a sufficient width of the apexes. This makes it possible to realize a durable dog clutch.

It has many excellent effects such as being able to control power simply by converting the amount of rotation or advancement of the nut into the amount of backward movement of the rod.

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the fastener before tightening, Figure 2 is a sectional view of the output part when tightening, Figure 3 is a sectional view of the output part after tightening, and Figure 4 is a sectional view of the output part when tightening is complete. FIG. 5 is a cross-sectional view of the output section with the gear and sleeve disengaged; FIG. 5 is a cross-sectional view with the detection rod returned to its original position; FIG. 6 is a cross-sectional view showing the engaged state of the gear and sleeve. Figure 7 is an explanatory diagram of the reaction force receiver and idling operation, Figure 8 is a sectional view taken along the line X-X in Figure 1, and Figure 9 is Figure 2 II.
10 is a sectional view taken along line X-X in Figure 1, Figure 11 is a sectional view taken along line XI-XI in Figure 1, and Figure 12 is a sectional view taken along line XI-XI in Figure 1. A cross-sectional view of the clutch control device, FIG. 13 is a cross-sectional view of the clutch control device in a state where the clutch is not engaged and the trigger is pulled,
Fig. 14 is a cross-sectional view of the state in which the trigger is released from the state shown in Fig. 13, Figs. 15, 16, and 17 are explanatory diagrams of the operation of the clutch control bag device when the detection rod moves backward, and Fig. 18 Fig. 19 is an explanatory diagram of the operation of the clutch control device during overload, Fig. 20 is a slope view of the clutch plate, Fig. 21 is a front view of the clutch plate, Fig. 22 is a side view of the clutch plate, Fig. 23 24 is a perspective view of the trigger, FIG. 24 is a perspective view of the latch pusher, and FIG. 25 is a plan view showing the relationship between the latch pusher and the latch. (1)...Power part (2)...Latch (3)
... Output part (5) ... Detection rod moving device (
8)...Reaction force receiver (7)...Clutch (70
)...Clutch control device (70m)...Clutch cutoff mechanism (7013)...Switch cutoff mechanism (71)...Rotating body (74)...Clutch plate (8)...Latch cutter (9 )···trigger(
91)... Sub-trigger applicant Maeda Metal Industry Co., Ltd. I?

Claims (1)

[Claims] (1) A clutch (7) is attached to a rotary drive device such as a motor (13).
) and a socket drive device (63) that drives the socket (62) via the differential speed reduction device, and a detection rod () that moves in the axial direction according to the amount of tightening by the output shaft (46) of the differential speed reduction device. 51), and a clutch control device (70) that turns off the clutch (7) and the switch (36) of the rotary drive device by the backward movement of the rod and an overload on the output shaft, and the clutch (7) has an input A rotating body (71) arranged concentrically with the input shaft (41) so as to freely rotate independently of the rotation of the input shaft and connected to a rotary drive device; A clutch plate (74) that is slidable on the top and biased toward the rotating body by a spring (76) and transmits the rotation of the rotating body (71) to the input shaft (41); A spring (78
), a rotating body (71) and a clutch plate (74).
) are provided with protruding mountain teeth (75) that can mesh with each other, and the clutch control device (70) is activated by the backward movement of the detection rod (51) to disengage the clutch (7). At the same time, the tightening control mechanism (70a) turns off the switch (36) of the rotary drive device, and the teeth (75) of the rotating body (71) and the clutch plate (74) are activated by the load acting on the clutch.
) and an overload control mechanism (70b) which operates when the clutch plate (74) moves backward to disengage the clutch (7) and turn off the rotary drive switch (36). Bolt and nut tightening device consisting of