JP2001088047A - Motor-driven wrench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with mannual tentative fastening of a screw with a pipe in connecting the pipe to a main body by means of a pipe joint and facilitate the tentative fastening and the following final fastening. SOLUTION: A head T of a screw with a pipe S is held by a screw fastening part 20 provided at a second body 14 of a motor-driven wrench 10. Under the condition, a toothed wheel 30 fixed to a drive shaft 28 of a motor 18 is energized to rotate counterclockwise and a toothed wheel 26 formed at the outer peripheral portion of the part 20 through toothed-wheels 34, 38a, 38b is operated to rotate clockwise. Accordingly, the part 20 rotates clockwise and the screw S composed of rightward screw is screwed in the fastening direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wrench, and more particularly, to an electric wrench which eliminates the need for manual fastening of screws with pipes and the like and facilitates the work of connecting a pipe to a main body. For a wrench.

[0002]

2. Description of the Related Art As a pipe joint for connecting a pipe to a main body, for example, a flare type pipe joint is employed. The flare type pipe joint is provided with a main body having a screw through which a pipe is inserted in the axial direction (hereinafter, referred to as a pipe screw), a screw hole into which the pipe screw is screwed, and the inside of the screw hole. And a tip end of the pipe is expanded in a tapered shape. That is, the pipe is firmly connected to the main body by screwing the pipe-equipped screw (male screw) into a screw hole (female thread) formed in the main body.

[0003] At this time, the tapered end portion of the pipe is seated on a seat provided inside the female screw. Thereby, the pipe and the main body are air-tightly or liquid-tightly connected.

[0004]

The screwing of the screw with a pipe into the screw hole as described above is performed by first screwing the screw with the pipe with a finger and temporarily tightening the screw with human power. When it is no longer possible to do so, it is performed by further tightening the screw with pipe using a torque wrench or the like.

[0005] However, such a screwing method causes an operator to become more fatigued as the number of times of screwing with the pipe increases. In addition, there is a problem that it takes a long time to connect pipes because the work up to temporary fastening is performed manually. That is, the pipe and the main body cannot be efficiently connected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and there is no need to manually perform temporary tightening of a screw with a pipe or the like, and furthermore, it is possible to easily connect a pipe to a main body. Accordingly, an object of the present invention is to provide an electric wrench capable of improving the efficiency of the connection work.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a body having a grip at one end, an electric motor installed on the body and driven by a battery, and A screw tightening portion that is provided at an end portion and has an opening into which a screw is inserted, and that rotates when the electric motor is rotationally urged; and starts or stops energization of the electric motor. Power switch, and a changeover switch for switching the rotation direction of the electric motor clockwise or counterclockwise, when the screw is temporarily tightened,
When the electric motor is energized, the screw tightening portion is rotated, and when the temporarily tightened screw is fully tightened, the body is turned off in a state where the power to the electric motor is stopped. It is characterized by being rotated.

[0008] By rotating the screw tightening portion in response to the rotational bias of the electric motor, the screw with the pipe held by the screw tightening portion is screwed without rotating the body. Can be. As a result, the pipe screw is screwed into the screw hole and temporarily tightened. Subsequently, the pipe-mounted screw temporarily tightened is then fully tightened by turning the body (entire electric wrench) manually by an operator in a state in which the power supply to the electric motor is stopped. .

It is preferable that the electric wrench further includes a lock mechanism for fixing and positioning the screw tightening portion when the screw tightening portion rotates in a direction to loosen the screw with the pipe. . By this fixed positioning, the positions of the screw fastening portion and the openings of the body can be surely matched.

[0010] It is preferable that a jig held between the screw with the pipe and the inner peripheral wall of the screw tightening portion when the screw with the pipe is rotated in the tightening direction is installed in the screw tightening portion. Since the pipe screw is prevented from sliding on the inner peripheral wall of the screw tightening portion, the pipe screw can be securely screwed in the screw tightening direction.

Further, it is preferable that a battery housing portion for housing the battery is installed on one end side (grip portion) of the body, and the battery housing portion is a grip member. Since it is easy to hold the electric wrench, the final tightening operation can be performed more easily.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an electric wrench according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an overall schematic perspective view of an electric wrench according to the present embodiment. As shown in FIG. 1, the electric wrench 10 includes a body 16 including a long first body 12 and a second body 14 connected to one end 12a of the first body 12. An electric motor 18 installed on the second body portion 14 and a screw tightening portion 20 installed on the second body portion 14 and rotating with the bias of the electric motor 18.
And a switch 22 for starting or stopping energization of the electric motor 18 and switching the rotation direction of the electric motor 18 clockwise or counterclockwise. A battery housing 24 for housing a battery for driving the electric motor 18 is provided on the other end 12 b of the first body 12.

The first body portion 12 and the second body portion 14 are connected to each other by bolts and nuts (not shown). Therefore, the angle between them can be freely set.

As shown in FIGS. 1 and 2, the second body 14 has an upper cover 14a and a lower cover 14b, and is partially surrounded by the covers 14a and 14b. The screw fastening part 20 is supported by the second body part 14.

[0016] Then, as shown in FIG.
A gear 26 is formed on the outer peripheral portion of the zero. And
The gear 26 rotates with the rotation of a gear 30 fixed to a drive shaft 28 of the electric motor 18. As a result, the screw fastening section 20 finally rotates. That is, a gear 34 is provided so as to mesh with the gear 30 and is fixed to the rotating shaft 32 held by the upper cover 14a and the lower cover 14b.
Between the gear 34 and the gear 26, similarly to the gear 34, two gears fixed to the rotating shafts 36a and 36b held on the upper cover 14a and the lower cover 14b, respectively, and arranged symmetrically to each other. Gears 38a and 38b are provided.

The above five gears 26, 30, 34, 38
a, 38b, a gear train 40 fixed to the drive shaft 28 of the electric motor 18
Is rotated counterclockwise, the gear 26 rotates clockwise. Accordingly, the screw tightening portion 20 also rotates clockwise, and as a result, the pipe screw S formed of the right-hand thread is screwed in a direction to be screwed into the screw hole H.

The upper cover 14a, the lower cover 14b, and the screw tightening portion 20 are tapered and open so that a part of a side wall thereof is cut out to insert the screw S with a pipe. Are formed, and when these positions coincide with each other, a screw insertion opening 42 that opens in a horizontal direction is formed (see FIG. 1). This screw insertion port 42
The screw S with a pipe inserted laterally from is held by the screw tightening portion 20 (see FIG. 2). That is, the pipe thread S once inserted into the screw insertion port 42 from the lateral direction, then falls by its own weight in the vertical direction in FIG.

The state in which the pipe-mounted screw S is held by the screw tightening portion 20 will be described in more detail with reference to FIG. In addition, in FIG. 3, only the head T of the screw S with a pipe is shown.

As shown in FIG. 3, the gear 26 is formed at a lower portion of the outer peripheral portion of the screw tightening portion 20 from a substantially middle portion. Further, the inner peripheral wall of the portion where the gear 26 is not formed is bulged as compared with the inner peripheral wall of the gear 26. That is, the bulging portion 44 is formed on the inner peripheral wall of the screw tightening portion 20. Therefore, when the screw S with a pipe is held by the screw tightening portion 20, the lower end surface 44 a
, The upper end surface of the piped screw S comes into contact.

The screw tightening portion 20 further has a jig accommodating portion 46 formed by cutting a part of the bulging portion 44 and a part of the inner peripheral wall of the gear 26 obliquely. Part 46
, A cylindrical jig 50 held at one end of a coil spring 48 is disposed. The other end of the coil spring 48 is seated on the inner wall of the jig accommodating portion 46. That is, the jig 50 can slide along the wall surface of the jig accommodating portion 46 as the coil spring 48 expands and contracts.

When the screw tightening portion 20 rotates clockwise, the coil spring 48 expands, so that the jig 50 projects to the maximum.
Between the inner peripheral wall and the inner peripheral wall. For this reason, as described below,
The pipe thread S consisting of a right-hand thread is securely screwed along the tightening direction. By this screwing operation, the piped screw S advances into the main body W along the screw hole H.

Here, as shown in FIGS. 2 and 4, a part of the rotating shaft 32 is cut out, and a pin 52 is provided in the cutout.
, The stopper 54 is fixed. Also, the coil 5
One end of the coil 6 is held between the pin 52 and the rotating shaft 32, and the other end of the coil 56 is held between the pin 52 and a bar 58 provided on the stopper 54. Therefore, when the gear 30 is urged to rotate counterclockwise, the rotating shaft 32
As the gear 34 rotates clockwise, the distal end of the stopper 54 slides along the inner peripheral wall 60 of the accommodating portion of the rotating shaft 32 formed on the upper cover 14a.

On the other hand, the rotation operation of the screw tightening portion 20 in the direction of loosening the screw S with a pipe, that is, the rotation operation in the counterclockwise direction is performed by the concave portion 62 formed in the inner peripheral wall 60 of the housing portion of the rotary shaft 32. This is prevented by fitting the stopper 54 to the groove (see FIG. 4). As a result, the rotation operation of the entire gear train 40 is prevented.

The direction of rotation of the gear 30 of the electric motor 18 can be switched by the switch 22.

The electric motor 18 is mounted on the second body 14 so that the axial direction of the electric motor 18 and the axis of the second body 14 are orthogonal to each other, as can be understood from FIG. . Therefore, it is avoided that the electric wrench 10 becomes longer in the axial direction than necessary. This electric motor 1
Reference numeral 8 drives the battery stored in the battery storage unit 24 as a power supply. Therefore, work can be performed even in a place where no AC power supply means exists. Energization of the electric motor 18 from the battery is started by closing the switch 22, and is stopped by opening the switch. That is, the switch 22 is a changeover switch for switching the rotation direction of the electric motor 18 and a power switch of the electric wrench 10.

The battery housing 24 is provided on the other end 12b of the first body 12, as described above. As described above, since the electric motor 18 is installed in the second body portion 14 and the battery housing portion 24 in which batteries are housed is installed in the first body portion 12, the weight of the electric wrench 10 is reduced at one place. Don't concentrate. Therefore, the worker can work without feeling that the weight of the electric wrench 10 is heavy.

The battery accommodating portion 24 is gripped by the operator together with the other end portion 12b of the first body portion 12. As will be understood from this, the battery housing portion 24 is also used as a gripping member. Therefore, the operator can easily hold the electric wrench 10.

The operation of the electric wrench 10 having the above-described configuration will be described with reference to the case where the thread S with a pipe of the flare type fitting (right-hand thread) is screwed into the screw hole H of the main body W as an example.
This will be described with reference to FIGS.

First, as shown in FIG.
Is inserted into the screw insertion port 42 from the side. At this time, the coil spring 48 contracts slightly,
As shown by a virtual line in FIG. 5, the jig 50 slightly retreats. As a result, the jig 50 is sandwiched between one end surface of the head T and the inner wall of the jig accommodating portion 46. In addition, when performing temporary tightening and final tightening of the piped screw S, the connection angle between the first body part 12 and the second body part 14 is adjusted according to the work space of the working place and the posture of the worker. You may do so.

Next, by closing the switch 22 and energizing the electric motor 18, the gear 30 is urged to rotate counterclockwise. At this time, the screw tightening portion 20 rotates clockwise, but the head T is not rotated until the coil spring 48 extends to the maximum.

When the coil spring 48 expands to the maximum, the protruding jig 50 is held between the head T and the inner peripheral wall of the gear 26 as shown in FIG. For this reason, the head T
Is firmly held by the screw fastening portion 20. In this state, when the rotation of the gear 30 is continued counterclockwise, the gear 3
4 rotates clockwise, and the gears 38a and 38b rotate counterclockwise. Along with this, the gear 26, that is, the screw tightening portion 20 rotates clockwise, and as a result, the pipe thread S is screwed clockwise.

At this time, since the jig 50 is interposed between the one end surface of the head T and the inner peripheral wall of the gear 26, the head T does not slide on the inner peripheral wall of the gear 26. Therefore,
The pipe thread S can be reliably screwed clockwise. By this screwing, the pipe thread S which is a right-hand thread
Proceeds into the main body W along the screw hole H. In other words, the pipe screw S is temporarily tightened in the screw hole H. When the opening of the screw tightening portion 20 reaches the position of the gear 38b and the gear 38b is no longer meshed with the gear 26, the rotating operation of the tightening portion 20 is performed by the gear 38a meshed with the gear 26. Can be continued.

At the output of the electric motor 18, the pipe thread S
When it is no longer possible to screw the wrench, the electric wrench 10 as a whole is manually tightened.

In this case, first, as shown in FIG. 7, the switch 22 switches the rotation direction of the gear 30 clockwise. When the gear 30 rotates clockwise, the gears 26 and 34 rotate counterclockwise. However, when the stopper 54 that slides on the inner peripheral wall 60 of the accommodating portion of the rotating shaft 32 reaches the concave portion 62, the distal end of the stopper 54 is fitted into the concave portion 62, and as a result, the gear train 40
Rotational operation is prevented throughout. At this time, the opening of the screw fastening part 20 and the opening of the second body part 14 exactly match, and the screw insertion port 42 is formed again.

When the screw tightening portion 20 rotates counterclockwise, the coil spring 48 contracts and the jig 50 moves backward to the jig accommodating portion 46. That is, the jig 50 separates from between the inner peripheral wall of the gear 26 and the head T,
The pipe screw S is released from the screw tightening section 20. For this reason, the head T is screwed counterclockwise and the pipe screw S
Will not loosen.

For example, the pipe screw S is stopped at the position shown in FIG. 6 by the temporary tightening, and in this state, the screw tightening portion 20 is rotated counterclockwise, and the jig 50 is turned into the pipe screw S.
When the screw insertion port 42 is formed beyond the apex angle of FIG.
As shown in FIG. 7, the jig 50 projects again to the maximum. That is, the jig 50 is connected to the inner peripheral wall of the gear 26 and the pipe screw S.
As a result, the head T is firmly held by the screw tightening portion 20 again.

Next, the switch 22 is opened to stop energizing the electric motor 18. In this state,
As shown in FIG. 8, the electric wrench 10 is rotated clockwise. As a result, the pipe screw S is screwed up to the end of the screw hole H, and the pipe P is connected to the main body W. At this time, the end face of the distal end portion of the pipe P sits on the seat V provided inside the screw hole H (see FIG. 2).

In order to release the screw S with a pipe from the electric wrench 10, as shown in FIG.
Rotate 0 counterclockwise. Also in this case, the jig 50 retreats to the jig accommodating portion 46 by the contraction of the coil spring 48. That is, the jig 50 is separated from the space between the inner peripheral wall of the gear 26 and the screw S with a pipe, and the screw S with a pipe is released from the screw tightening portion 20. Therefore, if the electric wrench 10 is retracted in the direction of arrow X in FIG. 9, the pipe screw S is detached from the electric wrench 10.

As described above, if the electric wrench 10 according to the present embodiment is used, it is not necessary to manually temporarily tighten the pipe-mounted screw S. In addition, temporary fastening and final fastening can be easily performed.

In the above-described embodiment, the screw S with a pipe is exemplified by a right-hand thread.
It may consist of a left-handed screw. In this case, jig 5
0, the stopper 54, the concave portion 62 and the like are arranged in mirror symmetry with the above embodiment. Then, when rotating the screw tightening portion 20 in the direction of tightening the pipe screw S, the gear 30 may be urged to rotate clockwise.

[0042]

As described above, according to the electric wrench according to the present invention, it is not necessary to manually tighten the pipe-mounted screw temporarily. Therefore, no fatigue is caused to the worker. In addition, since the temporary fastening and the final fastening of the pipe-equipped screw can be easily performed, the effect of significantly improving the efficiency of the operation of connecting the pipe to the main body is achieved.

[Brief description of the drawings]

FIG. 1 is an overall schematic perspective explanatory view of an electric wrench according to the present embodiment.

FIG. 2 is an enlarged longitudinal sectional view of a main part showing a state in which a screw with a pipe of a flare type fitting is tightened by the electric wrench of FIG. 1;

3 is an overall schematic perspective explanatory view showing a state in which a head of a screw with a pipe is held by a screw tightening portion provided in the electric wrench of FIG. 1;

FIG. 4 is a partially omitted plan view of the electric wrench shown in FIG. 2;

FIG. 5 is an enlarged plan view of a main part showing a state where the head of a screw with a pipe is inserted into the electric wrench of FIG. 1;

FIG. 6 is an essential part enlarged plan view showing a state in which a screw tightening portion and a pipe screw are rotated clockwise.

FIG. 7 is an enlarged plan view of a main part showing a state where only the screw tightening part is rotated counterclockwise from the state of FIG. 6;

8 is an essential part enlarged plan view showing a state in which the entire electric wrench is rotated clockwise from the state of FIG. 7;

9 is an enlarged plan view of a main part showing a state where the entire electric wrench is rotated counterclockwise from the state of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electric wrench 12 ... 1st body part 14 ... 2nd body part 16 ... Body 18 ... Electric motor 20 ... Screw tightening part 22 ... Switch 24 ... Battery storage part 26, 30, 34, 38a, 38b ... Gear 40 ... Gear Train 42 ... Screw Insertion Port 46 ... Jig Storage 50 ... Jig 54 ... Stopper 62 ... Recess H ... Screw Hole P ... Pipe S ... Pipe Screw T ... Head W ... Main Body

Claims (4)

[Claims] 1. A body having a grip at one end, an electric motor installed on the body and driven by a battery, and an opening installed at the other end of the body and into which a screw is inserted. A screw tightening portion that rotates with the rotation of the electric motor; a power switch for starting or stopping energization of the electric motor; and a clockwise or clockwise rotation direction of the electric motor. And a changeover switch for switching in a counterclockwise direction. When the screw is temporarily tightened, the electric motor is energized to rotate the screw tightening portion, and the temporarily tightened screw is fully tightened. The electric wrench according to claim 1, wherein the body is rotatable when the electric motor is stopped when the body is tightened. 2. The electric wrench according to claim 1, further comprising a lock mechanism for fixing and positioning said screw tightening portion when said screw tightening portion rotates in a direction to loosen the screw. Electric wrench. 3. The electric wrench according to claim 1, further comprising: a screw mounted on the screw tightening portion, wherein the screw and the inner peripheral wall of the screw tightening portion are rotated when the screw is rotated in the tightening direction. An electric wrench characterized by comprising a jig held between the wrench. 4. The electric wrench according to claim 1, wherein a battery housing for housing a battery for driving the electric motor is provided on the grip. Electric wrench.