JP3129070U - Bolt / nut tightening device - Google Patents

Abstract

[PROBLEMS] To provide a bolt and nut tightening machine that has excellent maneuverability, is easy to use, and can be configured at low cost.
Of the outer shaft 4 and the inner shaft 3 connected to the planetary gear booster 2, a reaction force receiver 5 is provided on the outer shaft 4, and the inner shaft 3 is engaged with an engaging portion 6 that engages with a mating bolt / nut. The tightening auxiliary power unit 1 is provided with a combination of an electric screwdriver 9 linked to the unit. The tightening machine 9 is smaller, lighter, and less expensive than a dedicated power tightening machine having two output shafts. Since the tightening auxiliary power unit 1 and the electric screwdriver 9 can be attached and detached, it is easy to handle and the mobility is enhanced.
[Selection] Figure 1

Description

  The present invention is based on a combination of a fastening auxiliary power unit having an engaging portion that engages with a bolt or a nut, a planetary gear booster, and a reaction force receiver, and a single output shaft electric driver linked to the fastening auxiliary power unit. The present invention relates to a bolt / nut tightening device.

For tightening bolts and nuts having a large diameter, there are a case where a dedicated power tightening machine having two output shafts is used and a case where a manual wrench and a tightening auxiliary power unit are used in combination (Patent Document 1).
The former dedicated power tightening machine includes a booster device for two output shafts by a planetary gear mechanism, a socket linked to one output shaft, a reaction force receiver linked to the other output shaft, and a motor.
The socket is fitted to the mating bolt or nut, the reaction force receiver is applied to the projecting object in the vicinity, and the exclusive power tightening machine is operated to perform tightening.
The latter tightening auxiliary power unit includes a two-output shaft booster using a planetary gear mechanism, a socket connected to one output shaft, and a reaction force receiver connected to the other output shaft.
The manual wrench for driving the tightening auxiliary power unit has an output shaft projecting perpendicularly to the handle at a head portion provided at the tip of a bar-like long handle.
Tightening is performed by engaging the socket of the tightening auxiliary power unit with a bolt or nut, connecting the output shaft of the manual wrench to the tightening auxiliary power unit, and rotating the handle in a plane orthogonal to the output shaft.

  The former dedicated power clamping machine can output large torque and fast tightening speed. However, since the tightening machine becomes large and increases in weight, there is a problem that the mobility is poor, it is inconvenient to carry, and it is expensive.

In the case of the latter manual type, if a manual wrench is removed from the tightening auxiliary power unit, the size can be reduced, it is convenient to carry, and it is much cheaper than a dedicated power tightening machine. However, since it is a manual input, there is a problem that a large torque cannot be output for a large labor burden on the operator and the tightening speed is slow.
In addition, since a work space capable of rotating the long handle is necessary, it cannot be used in a narrow place. In high-altitude work, there is a danger in turning the handle.
Also, when bolts and nuts are tightened with the tip of the bolt and the nut is tightened and the tip is sheared with a constant tightening reaction force, the tightening torque of the nut is greater than the torque that the tip shears. Decreases by the input torque. Compared to the dedicated power tightening machine that is used as standard, the manual type has a much larger input torque, so the nut is insufficiently tightened even if the tip is sheared. For this reason, it is necessary to carry out a tightening operation, and the work efficiency is further deteriorated.

Further, the twist of the tightening auxiliary power unit at the time of tightening is elastically restored, and the handle rotates in the anti-tightening direction corresponding to the elastic restoration. Therefore, there is a problem that even if the handle is reciprocally rotated, the torsional elastic deformation of the tightening auxiliary unit (1) does not affect the tightening. In order to solve this problem, a one-way clutch must be interposed between the tightening auxiliary power unit and the manual wrench to prevent the handle from returning, resulting in an increase in the bulk, weight and cost of the one-way clutch. To do.
The present invention clarifies a fastening device that can solve the above-described problems.

Japanese Utility Model Sho 63-86972

  The bolt and nut tightening machine according to claim 1 is one of the outer shaft (4) and the inner shaft (3) which are connected to the planetary gear booster (2) and are concentric and rotatable in opposite directions. A tightening auxiliary power unit (1) provided with a reaction force receiver (5) on the other shaft and an engaging portion (6) engaged with the other bolt / nut on the other shaft, and a planetary gear booster (2) It consists of a combination with an output shaft electric screwdriver (9) detachably linked to the input shaft (25).

  According to claim 2, the engaging portion (6) is provided so as to be able to rotate integrally with the inner shaft (3), and the reaction force receiver (5) can come into contact with a projecting member located in the vicinity of the bolt and nut to be tightened. It protrudes on the side of the outer shaft (4).

  According to a third aspect of the present invention, in the bolt and nut tightening device according to the first aspect, the engaging portion (6) is integrally rotatable with the outer shaft (4) and is integrally rotatable with a nut N screwed into the bolt B. And a reaction force receiver (5) provided on the inner shaft (3) so as to be rotatable integrally with the inner shaft (3) and formed at the tip of the bolt B. Is a chip fitting socket (54) for fitting.

  According to a fourth aspect of the present invention, in the bolt and nut tightening device according to any one of the first to third aspects, the one auxiliary output shaft electric driver (9) is connected to the auxiliary tightening power unit (1) via the booster unit (8). It is connected.

  According to a fifth aspect of the present invention, in the bolt / nut tightening device according to any one of the first to fourth aspects, the one-output shaft electric screwdriver (9) includes a battery (90) as a power source.

  A sixth aspect of the present invention provides the bolt and nut fastening device according to any one of the third to fifth aspects, wherein the input shaft (25) of the planetary gear booster (2) and the output shaft of the one-output shaft electric driver (9) are provided. (92) is detachably connected via a joint (94), and the tip T of the bolt B fitted in the tip fitting socket (54) can be sheared by rotation of the inner shaft (3). The sheared tip T remaining in the mating socket (54) can be projected by a projecting pin (11) slidably passing through the axis of the planetary gear booster (2), and the joint (94) is projected. The pin (11) has an escape space (97) that can penetrate the input shaft (25) and project outside the input shaft (25).

The single output shaft electric screwdriver (9) in the bolt / nut tightening machine according to claim 1 is smaller, lighter and less expensive than a dedicated power tightening machine provided with a planetary gear booster of two output shafts.
A bolt or nut is engaged with the engaging portion (6) of the tightening auxiliary power unit (1), and the reaction force receiver (5) is set on the mating member that receives the reaction force. ) Input shaft (25) can be connected to the output shaft (92) of one output shaft electric screwdriver (9), so it is easier to handle and move than the two-output shaft power tightening machine that is large and heavy. Excellent in properties.
The single output shaft electric screwdriver (9) and the auxiliary tightening power unit (1) can be easily separated, making it convenient to carry.

  In claim 2, even if the reaction force receiver (5) is not applied to the protruding member before tightening, the reaction force receiver (5) rotates by the tightening reaction force during the tightening process and naturally hits the protruding object and stops. Good workability.

In claim 3, the tip T formed at the tip of the bolt B is fitted into the tip fitting socket (54) on the inner shaft (3) of the tightening auxiliary power unit (1), and the nut on the outer shaft (4). When the nut N is fitted into the engagement socket 61 and the one-output shaft electric screwdriver 9 is operated, the tightening reaction force is received by the bolt tip T and the nut N is tightened until the tip T is sheared. Can do.
As the tip T is sheared, it can be seen that the nut N is visually tightened with an appropriate torque.
Since the torque input to the planetary gear can be the same as that of a dedicated power tightening machine that is used as a standard, it is not necessary to retighten the nut after the tip is sheared, so that workability can be improved.

  According to the fourth aspect of the present invention, the output torque can be increased by the amount that the boosting unit (8) is connected to the tightening auxiliary power unit (1), and the torque shortage of the tightening auxiliary power unit (1) can be compensated. In addition, input is possible with a small one-output shaft electric screwdriver, and the choice of electric screwdriver used for input increases.

  In claim 5, since the single output shaft electric screwdriver (9) has a built-in battery (90), the mobility is further enhanced without being restricted by the position of the power outlet in the field work and the length of the conductive cord. .

In claim 6, the bolt tip T after shearing remaining in the tip fitting socket (54) can be protruded by the protruding pin (11), and when the protruding pin (11) moves backward in preparation for the protrusion, Since the proximal end of the protruding pin (11) is designed to protrude from the tightening auxiliary power unit (1), it is tightened more than the design that fits into the tightening auxiliary power unit (1) even if the protruding pin (11) is retracted. The length of the auxiliary power unit (1) can be shortened to reduce the size and weight.
The small size and light weight of the tightening auxiliary power unit (1) can contribute to the small size and light weight of the entire tightening device.
The proximal end of the protruding pin (11) protruding from the tightening auxiliary power unit (1) is connected to the input shaft (25) of the planetary gear booster (2) and the output shaft (92) of the one output shaft electric driver (9). Since it enters the escape space (97) of the joint (94) that connects the two, there is no collision with other components.

[First Embodiment] (FIG. 1)
The bolt / nut tightening device includes a tightening auxiliary power unit (1) having an engaging portion (6) engaged with the bolt / nut, and a one-output shaft electric screwdriver (1) connected to the tightening auxiliary power unit (1). 9) (hereinafter simply referred to as “electric driver”).
In the following description, the tightening auxiliary power unit (1) side is referred to as “front”, and the electric driver (9) side is referred to as “rear” (the same applies to the subsequent “Example 2” and “Example 3”).

The electric screwdriver (9) has an output shaft (92) for fastening such as a bit and a socket attached to a rotary drive shaft (91) operated by a motor (93).
In the embodiment, the output shaft (92) of the electric screwdriver (9) has a square shaft (92a) at the tip.
As is well known, the output torque of the electric screwdriver (9) is not large, but by attaching a work tool such as a drill, brush or grindstone to the rotary drive shaft (91), it can be used for various work involving rotation. It is a versatile power rotary output machine.

  The tightening auxiliary power unit (1) includes a planetary gear booster (2) with two output shafts and one input shaft arranged in a cylindrical casing (20), and an inner link connected to the planetary gear booster (2). A shaft (3), an outer shaft (4), and an engaging portion (6) that projects from the tip of the inner shaft (3) and engages a mating bolt or nut (hereinafter referred to as "nut"). And a reaction force receiver (5) attached to the outer shaft (4).

The planetary gear booster (2) comprises a combination of a first planetary gear mechanism (21) located at the rear of the casing (20) and a second planetary gear mechanism (22) located in front of the first planetary gear mechanism (22).
The first planetary gear mechanism (21) includes a first sun gear (21a), a first planetary gear (21c), a first internal tooth (21b) formed on the inner surface of the casing (20), and a first planetary gear (21c). And a first planetary gear support frame (21d) that rotatably supports the first planetary gear.
The second planetary gear mechanism (22) also includes a second sun gear (22a), a second planetary gear (22c), a second internal tooth (22b) formed on the inner surface of the casing (20), and a second planetary gear (22c). And a second planetary gear support frame (22d) that rotatably supports the second planetary gear.
A second sun gear (22a) is integrally projected forward from the first planetary gear support frame (21d), and the second sun gear (22a) is positioned concentrically with the first sun gear (21a). Yes.
An inner shaft (3) is integrally projected from the axial center of the second planetary gear support frame (22d) toward the front.

The shaft portion of the first sun gear (21a) is an input shaft (25) for the planetary gear device (2), and the input shaft (25) is at the center of the lid (7) mounted on the casing (20). It is rotatably supported via a sleeve (71). A fitting portion (27) for fitting the output shaft (92) of the electric screwdriver (9) so as to be integrally rotatable is provided on the shaft core of the input shaft (25). The fitting portion (27) of the embodiment is a square hole (27a) into which the square shaft (92a) of the output shaft (92) of the electric screwdriver (9) is fitted.
When the output shaft (92) rotates clockwise (right screw nut tightening direction), the inner shaft (3) of the tightening auxiliary power unit (1) also rotates clockwise.

  The inner shaft (3) has an angular shaft (31) protruding from the tip, and an engaging portion (6) is detachably attached to the angular shaft (31). The engaging portion (6) of the embodiment is a nut engaging socket (61) having an engaging hole (62) that fits into the mating nut N.

  The outer shaft (4) is formed in a cylindrical shape by extending the casing (20) forward, and projecting pieces (42) protruding forward at two positions 180 ° opposite to the tip edge of the outer shaft (4). ) Is formed.

The reaction force receiver (5) is formed by cutting a thick metal plate having a large rigidity into a plate having a length of about 20 cm. The reaction force receiver (5) is gradually narrowed from the proximal end to the distal end, the proximal end is approximately 9cm wide, the distal end is approximately 3cm wide, and both ends are arcuate. Presents.
A round hole (51) is formed on the base end side of the reaction force receiver (5) (see FIG. 2), and as shown in FIG. A notch (53) is opened at the location.
The reaction force receiver (5) has the inner shaft (3) fitted into the round hole (51), the protrusion (42) of the outer shaft (4) fitted into the notch (53), and a plurality of bolts (52). It is fixed with screws to an annular block (26) provided in the casing (20). The head of the bolt (52) sinks within the thickness of the reaction force receiver (5).

Therefore, the nut N is engaged with the nut engaging socket (61) of the tightening auxiliary power unit (1), and the reaction force receiver (5) is applied to the protrusion located near the nut N. The fastening device is configured by fitting the square shaft (92a) of the electric screwdriver (9) into the square hole (27a) of the input shaft (25) of the fastening auxiliary power unit (1).
The electric screwdriver (9) is operated to rotate the input shaft (25) of the tightening auxiliary power unit (1).
The rotation of the input shaft (25) is decelerated and increased by the planetary gear booster (2) to rotate the nut engaging socket (61) and tighten the nut N.
Since the projecting force in the vicinity of the nut receives the tightening reaction force at this time via the reaction force receiver (5), the outer shaft (4) and the casing (20) of the planetary gear booster (2) do not rotate, and the nut Only the engagement socket (61) rotates and the nut N can be tightened safely.

As described above, the tightening auxiliary power unit (1) and the electric screwdriver (9) are separated, and the nut engaging socket (61) of the tightening auxiliary power unit (1) is fitted to the nut N, and then the electric screwdriver (9 ) Can be connected to the tightening auxiliary power unit (1), that is, the tightening auxiliary power unit (1) and the electric screwdriver (9) can be handled separately. Increases performance and makes work easier.
When the socket (61) is engaged with the nut N by the tightening device with the auxiliary power unit (1) and the electric screwdriver (9) connected, the worker handles the large and heavy tightening device. The labor burden is large and the mobility is reduced.
Since the electric screwdriver (9) has a built-in battery (90), the mobility is further enhanced without being restricted by the position of the power outlet in the field work and the length of the conductive cord.

[Second Embodiment] (FIGS. 2 and 3)
A boosting unit (8) is interposed between the tightening auxiliary power unit (1) and the electric screwdriver (9).
The tightening auxiliary power unit (1) and the electric screwdriver (9) are the same as those in the first embodiment, and thus description thereof is omitted.

The boosting unit (8) has a planetary gear device (82) built in a cylindrical casing (81). The planetary gear device (82) includes a first planetary gear mechanism (83) and a second planetary gear mechanism (84) in the same manner as the planetary gear device (2) of the tightening auxiliary power unit (1) described above.
Projecting from the planetary gear support frame (87) of the second planetary gear mechanism (84) forward is an angular shaft (88) that fits into the input square hole (27a) of the auxiliary tightening power unit (1), The sun gear (83a) of the first planetary gear mechanism (83) is provided with a square hole (83a ′) into which the angular shaft (92a) of the electric screwdriver (9) is fitted.
The front end of the casing (81) expands into a polygon so that it can be fitted into the polygon (70) of the lid (7) of the tightening auxiliary power unit (1). It has clamping bolts (80) for fixing.

The square shaft (88) of the booster unit (8) is fitted into the square hole (27a) of the tightening auxiliary power unit (1), and the enlarged portion (81a) of the casing (81) is attached to the tightening auxiliary power unit (1). The polygonal portion (70) of the lid (7) is fitted, and the boosting unit (8) is fixed to the tightening auxiliary power unit (1) by the clamp bolt (80).
The nut N is engaged with the nut engaging socket (61) of the tightening auxiliary power unit (1), and the reaction force receiver (5) is applied to the protrusion in the vicinity of the nut.
The electric screwdriver (9) is operated by engaging the output shaft (92) of the electric screwdriver (9) with the square hole (83a) of the boosting unit (8).
The rotation of the output shaft (92) is decelerated and increased by the booster unit (8), and further reduced and increased by the planetary gear booster (2) of the tightening auxiliary power unit (1). Rotate 61) and tighten nut N.
Since the projecting force in the vicinity of the nut receives the tightening reaction force at this time via the reaction force receiver (5), the outer shaft (4) and the casing (20) of the planetary gear booster (2) do not rotate. Only the socket (61) rotates and the nut N can be tightened safely.

  As described above, among the tightening auxiliary power unit (1), the boosting unit (8) and the electric screwdriver (9) constituting the tightening device, the electric screwdriver (9) is disconnected and the nut of the tightening auxiliary power unit (1) is cut. Since the electric screwdriver (9) can be connected to the booster unit (8) after the engagement socket (61) is fitted to the nut N, that is, the auxiliary tightening power unit (1) including the booster unit (8) and Since the electric screwdriver (9) can be handled separately, a large force is not required for handling the tightening device, the work becomes easy and the mobility is excellent.

[Third Embodiment] (FIGS. 4 and 5)
A bolt B and a nut N having a tip T for shearing at the tip can be tightened until the tip T is sheared, and a fastening pin 11 is provided for projecting the sheared tip T to the outside and discharging it. Device.
The tightening device has a cylindrical joint (94) interposed between the tightening auxiliary power unit (1) and the electric screwdriver (9).
Since the electric screwdriver (9) is the same as that of the first embodiment, description thereof is omitted.

The auxiliary tightening power unit (1) includes a first casing gear mechanism (21), a second planetary gear mechanism (22), and a third planetary gear mechanism (23) coaxially arranged in three stages in a cylindrical casing (20). The planetary gear booster (2) linked to the top is built in.
The casing (20) includes the internal teeth of the first to third planetary gear mechanisms.
The casing (20) also serves as the outer shaft (4) of the tightening auxiliary power unit (1), and an engaging portion (6) for the nut N is connected to the tip of the casing (20) so as to be integrally rotatable.
The engaging portion (6) is a nut engaging socket (61) having an engaging hole (62) with which the nut N is engaged.

The planetary gear support frame (23d) of the third planetary gear mechanism (23) on the output side of the planetary gear booster (2) and the cylindrical inner shaft (3) can be rotated together by a spline engagement (28) or the like. Is engaged.
In the inner shaft (3), the chip fitting socket (54) can be slid in the direction along the axis of the inner shaft (3) and can be rotated integrally with the inner shaft (3) by spline engagement (29). Has been deployed.
The front part of the chip fitting socket (54) is formed with an engagement hole (55) in which the chip T of the bolt B is engaged, and is urged forward by a spring (10).
The chip fitting socket (54) becomes a reaction force receiver (5) when the nut is tightened.

  The sun gear (21a) of the first planetary gear mechanism (21) on the input side of the planetary gear booster (2) extends the polygon shaft portion (21a ') backward, and the polygon shaft portion (21a' ) Is the input shaft (25).

A projecting pin (11) for projecting the tip is slidably disposed through the shaft core of the planetary gear booster (2).
A head (12) is fixed to the tip of the protruding pin (11), and the head (12) is slidably fitted to the inner surface of the rear part of the chip fitting socket (54).
The protruding pin (11) is urged forward by a spring (13).

  As shown in FIG. 5, in a state before the bolt and nut are engaged with the tightening auxiliary power unit (1), the chip fitting socket (54) enters the nut engaging socket (61), and the chip fitting is inserted. The tip of the head (12) of the projecting pin (11) protrudes into the engagement hole (55) of the mating socket (54). In this state, the base end of the protruding pin (11) is accommodated in the input shaft (25) of the planetary gear device (2) and does not protrude outward from the input shaft (25). In a state where the bolt tip T is fitted in the tip fitting socket (54) and the nut N is fitted in the nut fitting socket (61), the protruding pin (11) is pushed by the tip T and the base end is set to the input shaft. Project from (25).

  The joint (94) has a square hole (95) with which the polygonal shaft portion (21a ') of the tightening auxiliary power unit (1) is engaged at one end and a corner of the output shaft (92) of the electric screwdriver (9) at the other end. A square hole (96) is formed in which the shaft (92a) engages. Between the square holes (95) and (96), there is an escape space (97) for the protruding pin (11) protruding from the input shaft (25).

However, the joint (94) is connected to the tightening auxiliary power unit (1), and the chip fitting socket (54) of the tightening auxiliary power unit (1) is fitted to the bolt tip T while the electric screwdriver (9) is separated. Then, when the tightening auxiliary power unit (1) is pushed in a little, the tip fitting socket (54) moves backward against the spring (10) and opens the engagement hole (62) of the nut engagement socket (61). Thus, the engagement of the nut N with the engagement hole (62) is allowed.
At this time, the protruding pin (11) is pushed back by the bolt tip T, protrudes outward from the input shaft (25), and enters the escape space (97) in the joint (94).
When the square shaft (92a) of the electric screwdriver (9) is fitted into the square hole (96) of the joint (94) and the electric screwdriver (9) is operated, the bolt tip T Then, the nut N can be tightened until the tip T is sheared.
It can be seen visually that the nut N is tightened with an appropriate torque by shearing the bolt tip T.
When the tightening auxiliary power unit (1) is pulled away from the bolt and nut, the engaging portion (6) and the protruding pin (11) are returned to their original positions by the springs (10) and (13), and the head at the tip of the protruding pin (11) (12) protrudes the shearing tip T remaining in the tip fitting socket (54) and discharges it to the outside.

As described above, when the protruding pin (11) is retracted in preparation for protrusion, it is designed to protrude from the tightening auxiliary power unit (1). Therefore, even if the protruding pin (11) is retracted, the tightening auxiliary power unit (1 ) The length of the auxiliary auxiliary power unit (1) can be shortened to make it smaller and lighter than the design that fits inside.
The small size and light weight of the tightening auxiliary power unit (1) can contribute to the small size and light weight of the entire tightening device.

  In the tightening auxiliary power unit (1) of the third embodiment, the bolt tip T projects from the tip fitting socket (54) and pushes out the head (12) of the pin (11), so that the bolt tip T is securely inserted. As long as it does not fit in the mating socket (54), the chip mating socket (54) will not retract, that is, the nut N will not be securely mated with the nut engaging socket (61). However, the configuration of the “slick prevention means” is publicly known and is not related to the present invention, so that the description thereof is omitted.

6a, 6b, and 6c show an embodiment in which a holding means for holding the protruding pin (11) in the retracted position is provided on the joint (94) of the third embodiment.
The proximal end of the protruding pin (11) is formed on the circular arc surface (11a), approaches the circular arc surface, makes a round around the protruding pin (11), and forms a recessed portion (11b).
The holding means opens a guide hole (94a) in the joint (94) perpendicular to the axis of the joint (94), and houses the holding member (98) in the guide hole (94a) so as to be slidable. Yes.
One end of the guide hole (94a) is closed, and the other end is provided with a push button (98c), and a spring (98b) that biases the holding member (98) outward on the closed side of the guide hole Is deployed.
A hole (98a) is formed in the central portion of the holding member (98) so that the base end of the protruding pin (11) passes through in a state with almost no margin, and the protruding pin (11) side of the hole (98a) is opened. A conical guide surface (98d) gradually dented toward the hole (98a).
The hole (98a) of the spring-biased holding member (98) is slightly displaced toward the push button (98b).
As shown in FIG. 6a, when the protruding pin (11) is retracted and the proximal end of the protruding pin (11) hits the conical guide surface (98d) of the holding member (98), the holding member (98) is moved to the spring (98b). And slides through the hole (98a) of the holding member (98). The hole edge of the holding member (98) biased by the spring protrudes into the recess (11b) at the base end of the protruding pin (11), and the protruding pin (11) is held in the retracted position.
When the I push button (98B) is pressed, the engagement between the protruding pin (11) and the hole edge of the holding member (98) is released, and the protruding pin (11) is attached to the spring (13) on the side of the tightening auxiliary power unit (1). The bolt tip can be pushed out by pushing forward.

  The description of the above embodiment is for explaining the present invention, and should not be construed to limit the invention described in the scope of claims for utility model registration or to reduce the scope. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims of the utility model registration.

  For example, in the first and second embodiments, the engaging portion (6) is a socket that can be engaged with a polygonal head bolt such as a hexagon head bolt, or can be engaged with a polygonal hole bolt such as a hexagon socket head bolt. Of course, by using a bit, the bolt can be tightened.

It is sectional drawing of the clamping apparatus of 1st Example. It is sectional drawing of the clamping apparatus of 2nd Example. It is sectional drawing which cut away the input receiving part and input means of the clamping apparatus same as the above. It is sectional drawing of the clamping apparatus of 3rd Example. It is sectional drawing which cut away the input receiving part and input means of the clamping apparatus same as the above. FIG. 6 is an explanatory view of the means for holding the protruding pin. FIG. 6a shows the protruding pin in the retreating state, FIG. 6b shows a state in which the protruding pin is held by the holding member, and FIG. The state at the moment of release is shown.

Explanation of symbols

1 Tightening auxiliary power unit
11 Projection pin 2 Planetary gear booster
25 Input shaft 3 Inner shaft 4 Outer shaft 5 Reaction force receiver 6 Engagement part
61 Socket 8 Booster unit 9 1 Output shaft electric screwdriver
92 Output shaft

Claims (6)

  A reaction force receiver (5) is provided on one of the outer shaft (4) and the inner shaft (3), which are concentrically linked to the planetary gear booster (2) and can rotate in opposite directions. The other shaft is detachably connected to a tightening auxiliary power unit (1) provided with an engaging portion (6) that engages a mating bolt and nut, and an input shaft (25) of the planetary gear booster (2). Bolt / nut tightening device consisting of a combination with one output shaft electric screwdriver (9).   The engaging portion (6) is provided so as to rotate integrally with the inner shaft (3), and the reaction force receiver (5) is capable of coming into contact with a projecting member located in the vicinity of the bolt and nut to be tightened. The bolt and nut fastening device according to claim 1, wherein the bolt and nut fastening device is provided so as to protrude from the side of the bolt.   The engaging portion (6) is a nut engaging socket (61) that is provided so as to be rotatable integrally with the outer shaft (4) and is engaged with a nut N screwed into the bolt B so as to be rotatable integrally with the outer shaft (4). 2 is a chip fitting socket (54) which is provided on the inner shaft (3) so as to be rotatable integrally with the inner shaft (3) and into which a chip T formed at the tip of the bolt B is fitted. Bolt and nut tightening device.   The bolt / nut tightening device according to any one of claims 1 to 3, wherein a single output shaft electric screwdriver (9) is connected to the tightening auxiliary power unit (1) via a booster unit (8).   The bolt / nut tightening device according to any one of claims 1 to 4, wherein the single output shaft electric screwdriver (9) includes a battery (90) as a power source.   The input shaft (25) of the planetary gear booster (2) and the output shaft (92) of the one-output shaft electric screwdriver (9) are detachably connected via a joint (94) to rotate the inner shaft (3). Thus, the tip T of the bolt B fitted in the tip fitting socket (54) can be sheared, and the sheared tip T remaining in the tip fitting socket (54) can be used as the shaft of the planetary gear booster (2). The joint (94) can be projected by a projecting pin (11) slidably penetrating the core, and the projecting pin (11) projects through the input shaft (25) to the outside of the input shaft (25). 6. The bolt / nut tightening device according to claim 3, wherein the bolt / nut tightening device has a possible relief space (97).

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