JP7401628B2 - Corrugated pipe connection structure - Google Patents

Description

The present invention relates to a connecting structure for a corrugated tube that is attached to a rotating electric motor to tighten and loosen nuts on bolts.

For example, a cable rack installed to lay various cables in the ceiling of a building is a rack that supports the cables by placing them on long bolts suspended from ceiling beams. The rack is fixed at a predetermined height, and nuts are used to secure the rack to the bolts. The bolts for this cable rack are headless, also known as threaded bolts, long screws, full screws, etc. If the length of the screw cannot be determined until immediately before use, having a head is not convenient. It is used when a very long screw is required, when there is no problem with nuts on both sides.
In the cable rack mentioned above, in consideration of work efficiency and work time, it is desirable to tighten and loosen the nuts on the bolts by attaching a nut turning tool such as a socket to a rotating motor such as an electric screwdriver or electric impact wrench. . However, the socket does not have a space that can accommodate the end of the bolt that protrudes from the nut during tightening and loosening operations. Therefore, if the nut is attached at a position above the lower end of the bolt, it is impossible to tighten or loosen the nut using a socket and a rotating electric motor.

Therefore, the nut turning tool described in Patent Document 1 has been proposed so that the nut can be tightened and loosened using a rotating electric motor even when the nut is installed at a position above the lower end of the bolt. ing.
The nut turning tool of Patent Document 1 has a cylindrical body into which a fully threaded bolt is inserted, and a connecting body is provided at one end of the cylindrical body to connect to a rotating part of a rotating electric motor such as an electric drill or a rechargeable screwdriver. , a socket is provided at the other end of the cylindrical body into which a nut to be screwed onto the fully threaded bolt is fitted. This nut turning tool drills an appropriate number of through holes penetrating the side of the cylinder, inserts a pin that regulates the length of the fully threaded bolt inserted into the cylinder into the through holes, and then The connecting body is detachably provided, and the cylindrical body and the socket are detachably provided.

Publication number 7-42610

However, since the nut turning tool of Patent Document 1 does not have a cylindrical body that bends, the worker who is tightening or loosening the tool must always maintain a posture that supports the heavy rotating electric motor, which makes the task difficult. there were. In particular, when the bolt is suspended from a beam or the like, the worker must always maintain an upward position while supporting the heavy rotating electric motor, which is extremely difficult.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a structure for connecting a corrugated tube to be attached to a rotating electric motor, which allows an operator to perform tightening and loosening work in a comfortable position.

The corrugated tube connection structure according to claim 1 is a corrugated tube connection structure in which concave portions and convex portions formed on the outer surface are alternately continuous in the axial direction and have an annular shape extending in the circumferential direction,
The connecting portion to which the corrugated pipe is connected has a cylindrical outer wall, and an elastic claw is provided inside the outer wall and has elasticity in the inner and outer directions of the outer wall and projects on the inner surface of the outer wall. and the elastic claws are elastically deformed in an outward direction of the outer wall, so that the end of the corrugated tube is received inside the outer wall, and the elastic claws return to their original positions due to their elasticity. and is engaged with a recess on the outer surface of the corrugated tube, whereby the end of the corrugated tube is prevented from coming off from inside the outer wall,
The corrugated tube is allowed to rotate about its axis with respect to the connecting portion in a state where the end of the corrugated tube is prevented from coming off from inside the outer wall,
Furthermore, inside the outer wall, an insertion wall that is inserted into the end of the received corrugated tube is provided further back than the elastic claw in the receiving direction of the corrugated tube ,
An end of the corrugated tube is pressed and fixed toward the inner wall at a position corresponding to the inner wall, thereby restricting rotation of the corrugated tube with respect to the connecting portion. , a rotation follower is provided that rotates the connecting portion and the corrugated tube together .
As a result, by utilizing the elasticity of the elastic claws provided on the outer wall of the connection part, the corrugated pipe can be easily attached to and removed from the connection part, and the connection part and the corrugated pipe are prevented from slipping relative to each other. be done.

The present invention is a nut turning tool that is attached to a rotating electric motor to tighten or loosen a nut on a bolt, in which the rotation of a connecting shaft connected to a rotating part of the rotating electric motor is transmitted to a socket that is fitted onto the nut. Since the transmission part is formed of a flexible hollow tube, the end of the bolt protruding from the nut can be received inside the transmission part during tightening/loosening work, and the socket part can be freely adjusted as desired. You can point it in the right direction. Therefore, the operator can perform the tightening/loosening work in a comfortable position.
In addition, by using the elasticity of the elastic claws provided on the outer wall of the connection part, the corrugated pipe can be easily attached to and removed from the connection part, and the connection part and the corrugated pipe can be prevented from slipping relative to each other. Can be suppressed.

FIG. 1 is an exploded perspective view showing a nut turning tool according to an embodiment of the present invention. (a) is a side view, (b) is a side sectional view, and (c) is a perspective view seen from the front side, showing the connecting shaft portion of the embodiment. (a) is a side view, (b) is a side sectional view, (c) is a perspective view seen from the back side, and (d) is a perspective view seen from the front side, showing the socket portion of the embodiment. (a) is a side cross-sectional view, and (b) is a side view, showing the transmission part of the embodiment. It is a side sectional view showing a connection part of an embodiment, (a) in a state where rotation is permitted, and (b) a state in which rotation is restricted. (a) is a side view, (b) is a side cross-sectional view, and (c) is a perspective view seen from the front side, showing the gripping cylinder part of the embodiment. FIG. 4 is a partially enlarged side cross-sectional view showing the grip cylinder, in which (a) shows a state in which movement is restricted, and (b) shows a state in which movement is allowed. It is a perspective view showing a nut turning tool of an embodiment. FIG. 4 is an explanatory diagram showing the posture of a worker during tightening/loosening work, in which (a) the nut turning tool is facing upward, and (b) the nut turning tool is facing sideways. FIG. 7 is an enlarged side sectional view showing a state in which the bolt is received inside the transmission part.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a connecting portion of a corrugated tube according to an embodiment of the present invention will be described below with reference to the drawings.
In FIGS. 1 and 8, a nut turning tool 10 according to the present embodiment is mounted on a rotating electric motor to tighten and loosen nuts on bolts.
The nut turning tool 10 includes a connecting shaft portion 11, a socket portion 12, and a transmitting portion 13 that coaxially connects the connecting shaft portion 11 and the socket portion 12. 14 is externally packaged. Further, the transmission section 13 is separate from the connection shaft section 11 and the socket section 12, and is connected to the connection shaft section 11 and the socket section 12 via the connection section 15 provided on the connection shaft section 11 and the socket section 12, respectively. Detachably connected.
Each component of the nut turning tool 10 will be described in detail below. Note that in the following explanation, the same direction as the connection shaft 11 side with respect to the transmission part 13 is the proximal direction, and the same direction as the socket part 12 side with respect to the transmission part 13 is the distal end. direction.

The connecting shaft portion 11 is connected to a rotating portion of a rotary electric motor to receive rotation. In FIGS. 2(a) to 2(c), the connecting shaft portion 11 is formed into a substantially cylindrical shape.
A connecting shaft 11A is provided in the connecting shaft portion 11 so as to extend in the axial direction from the center of the proximal end surface. This connecting shaft 11A is for connecting to a rotating part of a rotary electric motor, and its shape, material, size, etc. are not particularly limited, as they are determined according to the rotary electric motor. The connecting shaft 11A of this embodiment is made of metal such as iron or stainless steel and is formed into a substantially hexagonal rod shape.
Furthermore, the connecting portion 15 is provided at the tip of the connecting shaft portion 11 . The configuration of this connecting portion 15 will be explained later.

The socket portion 12 is fitted onto the nut to rotate the nut during tightening/loosening operations. In FIGS. 3(a) to 3(d), the socket portion 12 is formed into a substantially cylindrical shape so that a bolt can be received therein.
A socket 12A is provided at the tip of the socket portion 12. This socket 12A is for fitting a nut therein, and its shape, size, etc. are not particularly limited, as they are determined according to the nut. The socket 12A of this embodiment is formed in a hexagonal cylindrical shape.
Furthermore, the connecting portion 15 is provided at the base end of the socket portion 12 . The configuration of this connecting portion 15 will be explained later.

The transmission section 13 connects the connection shaft section 11 and the socket section 12 coaxially and transmits the rotation of the connection shaft section 11 to the socket section 12 . That is, the rotation of the connecting shaft portion 11 connected to the rotating part of the rotary electric motor is transmitted to the socket portion 12 via the transmission portion 13, whereby the nut into which the socket portion 12 is fitted is rotated. Tightening and loosening work will be carried out.
In FIGS. 3(a) and 3(b), the transmission portion 13 is formed of a hollow tube that is flexible and capable of receiving a bolt therein.
The hollow tube of the transmission section 13 may be any flexible tube, such as a corrugated tube, rubber tube, resin tube, metal tube, coil spring, etc., and its shape, material, Also, the size such as thickness and length is not particularly limited.

The hollow tube of the transmission section 13 is preferably a corrugated tube 13A from the viewpoint that it is possible to suitably perform connection with the connection section 15 and control movement of the grip cylinder section 14.
The corrugated tube 13A has concave portions 13B and convex portions 13C formed alternately and continuously in the axial direction on its outer surface. There are two types of corrugated tubes 13A: one in which the concave portion 13B and the convex portion 13C form an annular shape extending in the circumferential direction, and the other in which the concave portion and the convex portion form a spiral shape extending in the axial direction. Any of these can be used for the transmission section 13 of the nut turning tool 10. The transmission section 13 of this embodiment uses a corrugated tube 13A made of synthetic resin and having an annular shape with a concave portion 13B and a convex portion 13C extending in the circumferential direction.

The connecting portion 15 is for detachably connecting the transmitting portion 13 to the connecting shaft portion 11 or the socket portion 12.
In FIGS. 5(a) and 5(b), the connecting portion 15 includes a substantially cylindrical outer wall 21. As shown in FIGS. An annular insertion portion 22 is provided at one end of the outer wall 21 to receive the end of the transmission portion 13 inside the outer wall 21 .
An elastic claw 23 is provided inside the insertion portion 22 so as to protrude onto the inner circumferential surface of the insertion portion 22 . This elastic claw 23 has elasticity in the radial direction of the insertion portion 22, that is, in the inner and outer directions of the outer wall 21.

When the end portion of the transmission portion 13 is inserted into the outer wall 21 from the insertion portion 22, the elastic claw 23 is pushed away by the end portion of the transmission portion 13, and is elastically deformed in the outward direction of the outer wall 21. When the elastic claws 23 are elastically deformed in the outward direction of the outer wall 21 in this way, there is no obstacle to the insertion of the end of the transmission part 13 into the inside of the outer wall 21, and the end of the transmission part 13 is inserted into the inside of the outer wall 21. The department will be accepted.
On the other hand, when the elastic claw 23 attempts to return to its original position from the above-mentioned elastically deformed position due to its elasticity, it engages with the outer circumferential surface of the end of the transmission portion 13 . When the elastic claws 23 are engaged with the outer circumferential surface of the end of the transmission section 13 in this manner, the end of the transmission section 13 is prevented from slipping out from inside the outer wall 21. In particular, when the transmission part 13 is the above-mentioned corrugated tube 13A, when the elastic claw 23 is engaged so as to enter the recess 13B of the corrugated tube 13A, the end of the transmission part 13 is moved from the inside of the outer wall 21. It becomes a state where it is stopped.

Inside the outer wall 21, an insertion wall 24 is provided at the other end opposite to the one end where the insertion portion 22 is provided. The insertion wall 24 is arranged to be located further back than the elastic claw 23 in the receiving direction of the transmission section 13. The insertion wall 24 is formed in a cylindrical shape and is configured to be inserted into the end of the transmission portion 13 received inside the outer wall 21.
In the connecting portion 15 provided on the connecting shaft portion 11, the inner insertion wall 24 is formed in a cylindrical shape with one end, which is the distal end, open and the other end, which is the proximal end, is closed (Fig. 2 (see (b)).
In the connecting portion 15 provided in the socket portion 12, the inner insertion wall 24 has both one end on the proximal side and the other end on the distal side so that the bolt can be received inside the socket portion 12. It is formed in a cylindrical shape with an opening (see FIG. 3(b)).

In a state where the end of the transmission section 13 described above is prevented from coming off from inside the outer wall 21, the transmission section 13 is allowed to rotate about its axis relative to the connection section 15. In order to restrict the rotation of the transmission part 13 with respect to the connection part 15 and cause the connection part 15 and the transmission part 13 to rotate together, a rotation follower part 25 is provided on the outer wall 21 at a position corresponding to the inner wall 24. ing.
The rotation follower 25 has a screw hole 25A formed to extend in the radial direction through the outer wall 21, and an operation knob 25B screwed into the screw hole 25A.
When the operation knob 25B is screwed into the screw hole 25A in the rotation follower 25, the end of the operation knob 25B passes through the screw hole 25A and protrudes into the outer wall 21, and the outer periphery of the end of the transmission section 13. It comes into contact with the surface (see FIG. 5(a)). When the operation knob 25B is further screwed into the screw hole 25A from this state, the end of the operation knob 25B will be in a fixed state by pressing the end of the transmission section 13 against the inner wall 24 (Fig. 5(b) )reference). In this state, rotation of the transmission section 13 with respect to the connection section 15 is restricted, and the connection section 15 and the transmission section 13 rotate together.

Here, the structure in which the transmission part 13 is detachably connected to the connection part 15 described above also corresponds to the connection part structure of a corrugated tube in the claims.
In addition, in relation to the connection part structure of the corrugated tube in the claims, the "transmission section 13" corresponds to the "corrugated tube" in the claims.

The grip cylinder part 14 is for maintaining the orientation of the socket part 12 in a state where the transmission part 13 is bent and the socket part 12 is directed in a desired direction.
In FIGS. 6(a) to 6(c), the gripping cylinder portion 14 is formed of a linear cylindrical body. The grip cylinder 14 has an axial length shorter than the axial length of the transmission section 13, and an inner diameter larger than the outer diameter of the transmission section 13 (see FIGS. 1 and 8). For this reason, the grip cylinder 14 externally attached to the transmission section 13 is configured to allow rotation of the transmission section 13 inside thereof and to be able to move along the axial direction of the transmission section 13.
A flange-shaped collar portion 27 is provided at the tip of the grip cylinder portion 14 . This flange portion 27 makes it easier for the operator to grip the grip tube portion 14 by placing his/her fingers on the grip tube portion 14 when the operator grips the grip tube portion 14 .

The gripping tube portion 14 has an engaging portion 28 at a further distal end than the collar portion 27 . The engaging portion 28 protrudes above the inner circumferential surface of the grip cylinder 14 and is elastic in the radial direction of the grip cylinder 14 .
An operation pin 29 is provided on the outer surface of the end of the engaging portion 28 that is the base end side of the gripping tube 14 so as to extend in an oblique direction away from the outer surface of the gripping tube 14 as it goes toward the distal end side of the gripping tube 14. is provided.
When the operating pin 29 is pushed into the grip cylinder part 14 with fingers, the engaging part 28 is elastically deformed to the outside of the grip cylinder part 14 and sinks from above the inner surface of the grip cylinder part 14 (FIG. 7). (b)), when the finger is released from the operating pin 29, it returns to its original shape and emerges onto the inner surface of the grip cylinder 14 (see FIG. 7(a)). That is, the engaging portion 28 is provided on the inner surface of the grip cylinder portion 14 so as to be freely retractable.

When the transmission part 13 is the corrugated tube 13A in which the above-mentioned concave part 13B and convex part 13C form an annular shape extending in the circumferential direction, the grip cylinder part 14 externally mounted on the transmission part 13 is provided on the inner surface so as to be freely retractable. The engaging portion 28 can be moved in and out of the recess 13B of the transmission portion 13 (corrugated tube 13A).
In FIG. 7(a), the engaging part 28 comes out onto the inner surface of the grip cylinder part 14, enters into the recessed part 13B of the transmission part 13 (corrugated tube 13A), and engages with the recessed part 13B, The movement of the grip cylinder part 14 in the axial direction of the transmission part 13 (corrugated tube 13A) is restricted. Further, since the recess 13B has an annular shape extending in the circumferential direction, the engaging portion 28 is guided in the moving direction by the recess 13B while being engaged with the recess 13B. ) allows rotation of the grip cylinder 14 in the circumferential direction.
In FIG. 7(b), the engaging portion 28 is recessed from the inner surface of the gripping cylinder portion 14 and pulled out of the recessed portion 13B of the transmission portion 13 (corrugated tube 13A), and then engaged with the recessed portion 13B. is released, allowing free movement of the grip cylinder part 14 along the axial direction of the transmission part 13 (corrugated tube 13A).

Here, also when the transmission part 13 is a corrugated tube in which the above-mentioned concave part and convex part form a spiral shape extending in the axial direction, the grip cylinder part 14 which is externally mounted on the transmission part 13 can freely move in and out of the inner surface. The provided engaging portion 28 can be moved in and out of the recessed portion of the transmission portion 13 (corrugated tube).
The engaging part 28 comes out onto the inner surface of the gripping cylinder part 14 and enters into the recess of the transmission part 13 (corrugated tube), and engages with the recess, and the shaft of the transmission part 13 (corrugated tube). The free movement of the grip cylinder 14 along the direction is restricted.
However, since this recess extends spirally in the axial direction of the transmission part 13, in a state where the engaging part 28 is engaged with this recess, the grip cylinder part 14 rotates around the outside of the transmission part 13 and rotates along the axis of the transmission part 13. can be moved in the direction. Furthermore, when the transmission section 13 is rotated about its axis while the grip tube section 14 is gripped and positioned, the engagement section 28 moves inside the grip tube section 14 relatively. While rotating, the transmission part 13 can be moved in the axial direction with respect to the grip cylinder part 14.

Next, the operation of the nut turning tool 10 of this embodiment and the corrugated tube connection structure will be explained.
In FIG. 8, the nut turning tool 10 of the present embodiment has a transmission section 13 with a grip cylinder section 14 mounted thereon, a connecting shaft section 11, and a socket section 12 connected via a connecting section 15. Can be assembled.
The work related to the connection between the connecting shaft part 11 and the socket part 12 and the transmitting part 13 (corrugated tube 13A) is performed by connecting the connecting part 15 provided in each of the connecting shaft part 11 and the socket part 12 to the transmitting part 13 ( Just inserting the end of the corrugated tube 13A) is simple and can be completed in a short time. That is, by simply inserting the end of the transmission section 13 (corrugated tube 13A) into the connection section 15, the elastic claw 23 of the connection section 15 is locked in the recess 13B of the transmission section 13 (corrugated tube 13A). The transmission part 13 (corrugated tube 13A) is in a state where it is prevented from coming off from the connection part 15 (see FIG. 5(a)).

After that, by operating the operation knob 25B with the rotation following part 25 of the connecting part 15 and fixing the end of the transmitting part 13 to the inner wall 24 of the connecting part 15, the connecting part 15 and the transmitting part 13 rotate together. As a result, the connecting shaft portion 11, the transmission portion 13, and the socket portion 12 can rotate integrally (see FIG. 5(b)).
Further, whether or not to cause the connecting portion 15 and the transmitting portion 13 to rotate together can be easily selected by operating the operating knob 25B in the rotation following portion 25. For example, in order to eliminate twisting of the transmission section 13, loosen the operation knob 25B of the rotation follower section 25 and release the fixation of the end of the transmission section 13 to the inner wall 24. Since rotation of the portion 13 is allowed, the transmission portion 13 is rotated relative to the connecting portion 15 to eliminate the twist.

Since the transmission part 13 of the nut turning tool 10 has flexibility, the socket part 12 can be freely directed in a desired direction by being bent or bent. Furthermore, the transmission section 13 is externally equipped with a gripping tube section 14, and since the gripping tube section 14 allows the transmission section 13 to rotate inside, the socket section 12 can be opened by gripping the gripping tube section 14. Tightening/loosening work can be performed while keeping the orientation in the desired direction.
In Figure 9(a), when screwing a nut onto a long bolt suspended from a ceiling beam, the worker WM maintains a comfortable posture with the heavy rotating electric motor EW hanging in one hand. The nut can be tightened or loosened by holding the gripping cylinder part 14 in the same position and bending the transmission part 13 so that the socket part 12 faces upward.
In FIG. 9(b), when screwing a nut onto a long bolt extending in the horizontal direction, the worker WM maintains a comfortable posture with the heavy rotary electric motor EW hanging in one hand, while holding the gripping cylinder. 14, flexing the transmission part 13, and turning the socket part 12 sideways, the nut can be tightened or loosened.

In FIG. 10, the transmission part 13 of the nut turning tool 10 can receive and accommodate the end of the bolt B therein during the tightening/loosening operation. Therefore, when a nut is screwed onto a long bolt B, the end of the bolt B protruding from the nut is accommodated inside the transmission section 13, so that the tightening/loosening operation can be continued.
Moreover, the transmission part 13 is prevented from deforming such as bending inside the gripping tube 14, and since the gripping tube 14 is linear, the linear shape is maintained. Therefore, when receiving the end of the bolt B inside the transmission part 13, by using the grip cylinder part 14 as a guide and keeping the transmission part 13 in a straight line, the end of the bolt B can be received inside the transmission part 13. It is possible to prevent this from getting caught.
The grip cylinder part 14 can also lift the transmission part 13 by lifting the grip cylinder part 14 with the engaging part 28 engaged with the recess 13B of the corrugated tube 13A of the transmission part 13. In the case where the hollow tube of the transmitting section 13 is a corrugated tube having a spiral shape, the transmitting section 13 can also be lifted by lifting the grip cylinder section 14 in the same manner.

By the way, the nut turning tool 10 of the above embodiment has a structure in which the transmission part 13, the connecting shaft part 11 and the socket part 12 are separate bodies, and each is detachably connected. When implemented, the configuration is not limited to this, and a configuration in which the transmission part 13, the connecting shaft part 11, and the socket part 12 are irremovably connected by adhesive, welding, fixing, etc., or a transmission part 13, the connecting shaft portion 11, and the socket portion 12 can be integrated.

Furthermore, in the embodiment described above, the engaging part 28 is provided in the gripping cylinder part 14 to restrict the free movement of the gripping cylinder part 14 along the axial direction of the transmission part as desired. may be omitted, and a configuration may be adopted in which the grip cylinder portion 14 is always allowed to freely move along the axial direction of the transmission portion.

Furthermore, the corrugated tube connection structure of the present invention can be used not only for connecting a corrugated tube as a transmission section for a nut-driving tool but also for connecting a corrugated tube as a conduit.

10 Nut turning tool 22 Insertion part 11 Connection shaft part 23 Elastic claw 11A Connection shaft 24 Insertion wall 12 Socket part 25 Rotation following part 12A Socket 25A Screw hole 13 Transmission part 25B Operation knob 13A Corrugated tube 27 Flange part 13B Recessed part 28 Engagement Joining part 13C Convex part 29 Operation pin 14 Gripping cylinder part WM Operator 15 Connection part EW Rotating motor 21 Outer wall B Bolt

Claims (1)

A corrugated pipe connection structure having an annular shape in which concave portions and convex portions formed on the outer surface are alternately continuous in the axial direction and extend in the circumferential direction,
The connecting portion to which the corrugated pipe is connected has a cylindrical outer wall, and an elastic claw is provided inside the outer wall and has elasticity in the inner and outer directions of the outer wall and projects on the inner surface of the outer wall. and the elastic claws are elastically deformed in an outward direction of the outer wall, so that the end of the corrugated tube is received inside the outer wall, and the elastic claws return to their original positions due to their elasticity. and is engaged with a recess on the outer surface of the corrugated tube, whereby the end of the corrugated tube is prevented from coming off from inside the outer wall,
The corrugated tube is allowed to rotate about its axis with respect to the connecting portion in a state where the end of the corrugated tube is prevented from coming off from inside the outer wall,
Furthermore, inside the outer wall, an insertion wall that is inserted into the end of the received corrugated tube is provided further back than the elastic claw in the receiving direction of the corrugated tube ,
At a position of the outer wall corresponding to the inner wall, an end of the corrugated tube is pressed and fixed against the inner wall to restrict rotation of the corrugated tube with respect to the connecting portion, and A connecting portion structure for a corrugated tube, characterized in that a rotation following portion is provided for co-rotating the connecting portion and the corrugated tube.

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