JPH0260471B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to power rotary tools such as bolt fasteners and power-driven drills.

As shown in FIG. 5, various bolt tightening tools have been proposed in the past for tightening a torque control bolt 6 having a shearing tip 61 at its tip.

The bolt tightening tool basically has an inner socket 13 and an outer socket 12 at the tip as shown in FIG.
Then, the outer socket 12 is fitted into the nut 62 screwed onto the bolt 6, respectively, to drive the sockets 12 and 13, and the tightening reaction force of the nut 62 is received and supported by the bolt tip 61 via the inner socket 13. , shear the bolt tip 61.

Bolt fasteners have a complicated internal structure, have a large number of parts, and are heavy in weight because they are made strong enough to withstand the strong force that occurs when shearing the bolt tip.

Bolt tightening work using the above-mentioned fasteners is often done at heights such as steel frame assembly and bridge construction, and depending on the direction of the bolt, the fasteners are used facing upwards, downwards, sideways, or diagonally. As described above, the position of the center of gravity of the bolt fastener has a large effect on its ease of handling.

The bolt fastener shown in FIG.
3. The differential speed reducer 11 and the motor 51 are arranged in a straight line, and the handle 2 is protruded from approximately the center, and the center of gravity is located close to the handle 2, making it relatively easy to support.

However, since the length of the machine is long, it has a fatal drawback that it cannot be used in narrow places such as H-shaped steel grooves.

As shown in FIG. 6, the sockets 12, 13 and the differential reduction gear 11 are arranged on the same axis, the motor 51 is arranged perpendicular to the axis, and the handle 2 is protruded approximately parallel to the motor 51, Alternatively, as shown in FIG. 8, the sockets 12, 13 and the differential speed reduction device 11 are arranged on the same axis, and the motor 51 and the handle 2 are protruded from an axis perpendicular to the axis, so that the sockets 12, 13 and the differential speed reduction device 11 can be moved in the direction of the sockets 12, 13. A bolt tightening tool is also known that has a shorter machine length and can be used in narrow places such as the groove 71 of the H-shaped steel 7.

However, in both of the bolt fasteners shown in FIGS. 6 and 8, the center of gravity W is located near the intersection of the motor 51 and the reduction gear, and is far away from the handle 2. The burden felt is so great that it is difficult to handle with one hand, and the other hand is often placed on the tightening tool to support it with both hands.

In particular, when inserting the fastener into the groove 71 of the H-shaped steel 7 with the upward direction as shown in Figure 8, and tightening the bolt while lifting the fastener by hand, you must use both hands to support the fastener. It is impossible to do so.

When working at heights, having to use both hands to handle fasteners is extremely problematic in terms of safety.

The above describes the bolt tightening tool for tightening bolts with shearing tips, but the external configuration and appearance also apply to other rotary power tools such as nut runners, torque control wrenches, power-driven drills, power-driven drivers, and impact wrenches. It goes without saying that the relationship between the center of gravity positions greatly affects the ease of handling, similar to the bolt tightening tool described above.

The technical problem to be solved by the first invention of the present application is to shorten the length of the aircraft so that it can be used in narrow spaces, and to improve operability by moving the center of gravity closer to the handle.

Another technical problem to be solved by the present invention is to enable the power rotary tool to be supported with one hand when the power rotary tool is used in an upward position while being lifted by hand.

In order to solve the above-mentioned first technical problem, the present invention provides a power unit accommodating portion at one end of the handle and an output portion at the other end protruding in substantially the same direction, so that the power unit accommodating portion 4 side is provided with respect to the grip of the handle. The structure is such that the weight on the output section 1 side and the weight on the output section 1 side are balanced.

In order to solve the above-mentioned second technical problem, the second invention of the present application has, in addition to the structure of the above-mentioned first invention, an auxiliary handle disposed between the power device accommodating part and the output part, facing the handle.

The weights of the power unit accommodating part 4 and the output part 1 of the rotary tool are balanced, and the power unit accommodating part 4 and the output part 1 protrude forward from both ends of the handle.
Since the center of gravity of the rotary tool is located between the power unit accommodating part and the output part, and slightly on the working side of the handle, it is easy to orient the rotary tool when using the handle, and it also makes it easier to orient your wrist. It's not a big burden.

If there is a space where the output section can be inserted, the space is H
It can be used even in narrow spaces such as grooves in shaped steel.

Furthermore, when working while lifting a rotary tool in an upward position, the rotary tool can be supported in a well-balanced manner by simply gripping the auxiliary handle with one hand, and the other hand can be used to ensure the safety of the worker.

The present invention will be specifically described below based on an example of a bolt fastener shown in the drawings.

The bolt fastener has an output part 1 having an outer socket 12 and an inner socket 13 at its tip, and a main handle 2 protruding from the base end of the output part 1 at an angle of 90 to 70 degrees with respect to the output part 1. A power unit accommodating portion 4 is provided protruding from the base end in the same direction as the output portion 1.

An auxiliary handle 3 is provided opposite to the main handle 2 and protrudes between the output part 1 and the power unit accommodating part 4.

A differential speed reduction device 11 is incorporated in the output section 1,
Two output shafts (not shown) of the device are connected to the outer socket 12 and inner socket 13.

In the power device accommodating portion 4, a power device 50 is disposed in a case 41 screwed to the main handle 2. Although the power device 50 in the embodiment is an electric motor 51, it is of course possible to use an air motor or a hydraulic motor.

The rotating shaft 52 of the electric motor 51 is connected to the main handle 2
The differential speed reduction device 11
is connected to.

The main handle 2 and the auxiliary handle 3 are provided with operation switches 21 and 31, respectively.

A feature of the present invention is that in the bolt tightening device, when the auxiliary handle is placed at the bottom, the weight on both sides of the main handle is balanced on the main handle 8.

In other words, the center of gravity of the bolt tightener is the output part 1,
It is located in a space surrounded by the power unit accommodating part 4 and both handles 2 and 3, and the center of gravity is located at an intermediate position between the output part 1 and the power unit accommodating part 4 and closer to the main handle 2 side. It is most desirable that there be.

Therefore, in the embodiment, the output section 1 and the power unit housing section 4 are
and are formed to have approximately the same weight so that the center of gravity W is located on the midline between the power unit housing section 4 and the output section 1,
Furthermore, by arranging the power unit accommodating portion 4 slightly rearwardly with respect to the output portion 1, the center of gravity is moved toward the main handle 2 side.

Therefore, when tightening bolts, the worker grasps the main handle 2 with one hand, and the other hand grasps a steel frame or other construction material that can support the worker's body in order to ensure his or her own safety.

The center of gravity of the fastener is close to the main handle 2 and is located between the output part 1 and the power unit housing part 4, so when you grip the main handle 2, the handle is smooth and there is no heavy burden on your wrists. It can be easily operated with one hand in horizontal positions, upward facing positions, and other free working positions, reducing worker fatigue even during long hours of work.

In addition, since the center of gravity is located on the work side of the main handle 2, when the main handle 2 is gripped, the work direction can be unconsciously determined as to which direction the work side, that is, the output side is facing, with respect to the grip position.

This is because the telephone handset has a receiving part and a transmitting part protruding from both ends of the handle in approximately the same direction, and the center of gravity is located in the space between the transmitting part, the receiving part, and the handle. This is similar to the fact that the moment the user grasps the steering wheel, the user can place the transmitting and receiving parts against his or her mouth and ears without having to be consciously aware of it. It's important.

Further, in the fastener according to the present invention, since the main handle 2 and the sockets 12, 13 are located close to each other,
13 can be easily engaged with the bolt tip 61 and nut 62, and the operability is extremely good.

Furthermore, since the output section 1 and the power unit accommodating section 4 are arranged approximately parallel to each other, if there is a space in which the output section 1 can be inserted,
Bolt tightening work can also be done in narrow places such as grooves in H-beam steel.

FIG. 3 shows how to tighten the bolts by grasping the auxiliary handle 3.

This is the case, for example, when a bolt tightener is lifted by hand in the upward position in the groove 71 of the H-shaped steel 7, and the auxiliary handle 3 is grasped with one hand, while the other hand is used to ensure the safety of the worker. It can be used for

FIG. 4 shows another embodiment of the bolt fastener in which the auxiliary handle is omitted.

Output section 1 and power unit housing section 4 arranged approximately in parallel
The base ends of the handles 2 are connected to each other by a handle 2, and when the handle 2 is turned sideways, the weight on both sides of the handle 2 is balanced on the handle 2. That is, the center of gravity W is located in a space surrounded on three sides by the output section 1, the power unit housing section 4, and the handle 2.

The bolt tightening tool without the auxiliary handle is inconvenient to lift and use with one hand as shown in Figure 3, but when used horizontally, downwards, upwards, or diagonally, It is as easy to use as a bolt tightener with an auxiliary handle.

FIG. 9 shows the present invention implemented in a nut runner, and the rotary socket 14 and the speed reducer 17 are
The output section 1 and the power device housing section 4 are connected by the main handle 2 and the auxiliary handle 3, and the center of gravity W is located in the space surrounded by the output section 1, the power device housing section 4, and both handles 2 and 3. Located within.

The power unit accommodating portion 4 is provided with a control device 56 that automatically stops the electric motor 51 and the motor according to the load generated on the rotating socket 14 during bolt tightening.

The speed reducer 17 and the motor 51 include a rotation transmission shaft 53 and a gear mechanism 54 disposed in the main handle 2.
55.

A reaction force receiving piece 15 is protruded from the tip of the outer case 16 of the output section 1 to receive the reaction force acting on the nut runner during bolt tightening.

Like the bolt tightening tool, the nut runner has a center of gravity W close to the main handle 2, and has good operability. To use the nut runner, engage the nut in the rotating socket 14 in the same manner as a conventional nut runner, place the reaction force receiving piece 15 on an appropriate protrusion around the nut, and operate the switch 21.

Incidentally, the present invention includes the outer socket 12 as described above.
The present invention is not limited to bolt tighteners and nut runners having the inner socket 13, and can be applied to rotary tools in general such as torque control wrenches, power-driven drills, power-driven drivers, and impact wrenches. Of course, various modifications are possible within the technical scope described in .

[Brief explanation of the drawing]

Figure 1 is an inclined view of the bolt tightener, Figure 2 is a front view of the bolt tightener, Figure 3 is a front view showing how it is used with the auxiliary handle gripped, and Figure 4 is the auxiliary handle omitted. Front view of the bolt tightener, Figure 5 is a front view of the torque control bolt, Figures 6 and 7
The figure is a front view of a conventional bolt fastener, FIG. 8 is a front view showing an example of a conventional usage state, and FIG. 9 is a front view of a nut runner. DESCRIPTION OF SYMBOLS 1... Output part, 11... Differential speed reduction device, 12... Outer socket, 13... Inner socket, 2... Main handle, 3... Auxiliary handle, 4... Power device housing part, 61... Shearing tip.

Claims (1)

[Scope of Claims] 1. A power device accommodating portion 4 is provided at one end of the handle, and an output portion 1 is provided at the other end thereof protruding in the same direction at a substantially right angle to the handle. A power rotary tool whose weight is balanced between the side and the output part 1 side. 2 The output section 1 includes an outer socket 12 into which a nut is fitted, an inner socket 13 into which a shearing tip 61 at the tip of a bolt is fitted, and both sockets 1.
Claim 1, which is a bolt tightening tool comprising a differential reduction gear 11 connected to 2 and 13.
Powered rotary tools as described in section. 3. The power rotary tool according to claim 1 or 2, wherein the power device arranged in the power device housing section 4 is an electric motor. 4. Claim 1 or 2, wherein the power device installed in the power device housing section 4 is an air motor.
Powered rotary tools as described in section. 5 A power device accommodating portion 4 is provided at one end of the main handle 2, and an output portion 1 is provided at the other end protruding in substantially the same direction. An auxiliary handle 3 is provided, and a main handle 2
A power rotary tool in which the weights on the power unit housing section 4 side and the output section 1 side are balanced. 6 The output section 1 includes an outer socket 12 into which a nut is fitted, an inner socket 13 into which a shearing tip 61 at the tip of a bolt is fitted, and both sockets 1.
Claim 5, which is a bolt tightening device comprising a differential reduction gear 11 connected to 2 and 13.
Powered rotary tools as described in section. 7. The power rotary tool according to claim 5 or 6, wherein the power device arranged in the power device housing section 4 is an electric motor. 8. Claim 5 or 6, wherein the power device installed in the power device housing section 4 is an air motor.
Powered rotary tools as described in section.