Technical field
[0001]
　TECHNICAL FIELD The present invention relates to a tube mounting structure used for releasing static electricity generated in a flexible tube such as a hose or tube, and an earth clip used in the tube mounting structure.
Background technique
[0002]
　Conventionally, as this type of pipe mounting structure and grounding clip, a hose with a conductive wire exposed on the surface of the hose is fitted into a metal pipe that is grounded, and a grounding member is fitted to the connection between the metal pipe and the hose. Then, there is a hose connection structure in which the ground member is brought into contact with the metal pipe and the conductive wire on the surface of the hose (see, for example, Patent Document 1).
　The grounding member has a coil made of a metal wire and a pair of knobs. When the knob is pinched, the inner diameter of the coil expands, and when the knob is released, the elastic force of the coil expands. It is configured to return to its original inner diameter.
　The method of attaching the grounding member is to fit the grounding member into the metal pipe in advance, and after the hose has been fitted into the metal pipe, expand the diameter of the coil by pinching the knob, and pull the spiral provided on the hose. The grounding member is rotated so as to be in the same direction as the spiral direction of the reinforcing member. With this rotation, the hose and the metal pipe are tightened by releasing the knob while a part of the coil is in contact with the metal pipe. This tightening keeps the coil portion in contact with both the conductive wire of the hose and the metal pipe, and the conductive wire of the hose is electrically connected to the metal pipe through the coil portion. Therefore, even if static electricity is generated in the hose, the static electricity is discharged from the conductive wire to the metal pipe through the coil portion.
　Furthermore, by increasing the inner diameter of the coil portion from the metal pipe side toward the hose side, the grounding member can be firmly attached even if the hose is thick.
prior art documents
Licensed Literature
[0003]
Patent document 1: JP-A-2002-005372
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0004]
　The grounding member of Patent Literature 1 needs to be correctly set by the operator with the expanded hose side of the coil portion facing the hose.
　However, in the grounding member of Patent Document 1, if the pair of knob portions have the same shape, the inner diameter of the coil portion is only slightly different between the metal pipe side and the hose side. It was difficult to easily recognize the orientation with respect to the As a result, there is a risk that the operator may mistakenly set the grounding member in the opposite direction.
　If the operator mistakenly sets the grounding member in the opposite direction, the large-diameter hose side of the coil faces the metal pipe in the radial direction. There was a problem that electrical connection was disabled and discharge was not possible.
　Furthermore, when the worker forcibly attaches the coil portion to the reinforcing member of the hose in the opposite direction, the coil portion strongly contacts between the helical reinforcing members (trough portions), respectively, thereby causing the coil to collapse. There was a risk that the part would twist and deform due to friction. In addition, there is a risk that the coil part will ride on the reinforcing member (mountain portion) and expand and deform more than necessary, resulting in deformation of the coil part, damage to the hose, and deformation of the hose. As a result, there is a problem that the coil portion or the hose is easily damaged.
Means to solve problems
[0005]
　In order to solve such problems, a pipe mounting structure according to the present invention is a pipe mounting structure in which a ground clip is attached across a grounded conductive pipe and a flexible tube inserted into the outer surface of the conductive pipe. The ground clip includes a coil portion attached to the outer surface of the conductive tube and the outer peripheral surface of the flexible tube, and a pair of knob portions projecting from both axial ends of the coil portion and facing each other. Preferably, one of the pair of knob portions has an asymmetric index portion having directivity in the axial direction of the coil portion.
　Further, in order to solve such problems, an earth clip according to the present invention is an earth clip attached across a grounded conductive tube and a flexible tube inserted into the outer surface of the conductive tube, a coil portion attached to the outer surface of the conductive tube and the outer peripheral surface of the flexible tube; and a pair of knob portions projecting from both axial ends of the coil portion and facing each other, One of the knobs is characterized by having an asymmetric index portion that is directional in the axial direction of the coil.
Brief description of the drawing
[0006]
1 is an explanatory diagram showing the overall configuration of a pipe mounting structure according to an embodiment of the present invention, and a front view of a pipe connection state; FIG.
[Fig. 2] Fig. 2 is an explanatory view showing the overall configuration of a ground clip according to an embodiment of the present invention, where (a) is an enlarged front view, (b) is an enlarged side view, and (c) is a perspective view.
3 is an enlarged front view showing a modification of the ground clip according to the embodiment of the present invention; FIG.
4 is an enlarged front view showing a modification of the ground clip according to the embodiment of the present invention; FIG.
5 is an enlarged front view showing a modification of the ground clip according to the embodiment of the present invention; FIG.
[Fig. 6] Fig. 6 is an explanatory drawing showing a method of attaching the earth clip, (a) is a front view when the clip is attached to the conductive tube, (b) is a front view when the tube is inserted into the conductive tube, and (c) is the rotation of the clip. It is a front view of time.
MODE FOR CARRYING OUT THE INVENTION
[0007]
　BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
　The present invention relates to a tube mounting structure D in which a ground clip C is attached across a conductive tube A and a flexible tube B as shown in FIGS. 1 to 6, and a ground clip C used in the tube mounting structure D.
　These pipe mounting structures D and grounding clips C eliminate static electricity generated when food powders and grains such as wheat, soybeans, and seasonings, and powders and powders in other fields are transported by pipe. provided for escape.
　The conductive pipe A is a non-deformable tubular body made of a conductive material such as a metal pipe, and is attached so that its outer surface A1 is exposed to equipment A2 such as a manufacturing machine. By grounding the facility A2, the conductive tube A is grounded.
　The flexible tube B is provided with an electrical conductor made of a flexible conductive material on at least a part of its outer peripheral surface. The flexible tube B includes, as main components, a flexible tube body B1 and a conductor B2 exposed on the outer surface of the tube body B1. Further, it is preferable to provide a reinforcing member B3 spirally protruding along the outer surface of the pipe body B1 and the outer surface of the conductor B2.
　The conductor B2 is arranged linearly or spirally in the axial direction along the outer surface of the pipe body B1. The outer surface of the tube body B1 and the outer surface of the conductor B2 are exposed on the outer peripheral surface of the flexible tube B, except for the reinforcing member B3.
　The inner diameter of at least the connection-side end portion B1a of the pipe body B1 that is inserted into the conductive pipe A is set to be substantially the same as or slightly smaller than the outer diameter of the conductive pipe A. It is preferred to plug into tube A.
[0008]
　In the case shown in FIG. 1 as a specific example of the tube mounting structure D, two conductive tubes A, which are grounded, are provided so as to correspond to both ends of the flexible tube B. As shown in FIG. By inserting and connecting both connection side ends B1a of the flexible tubes B to the two conductive tubes A, each tube connection portion is grounded.
　As other examples (not shown), it is possible to directly or indirectly wire-bond two conductive tubes A to each other, or to connect a plurality of flexible tubes B in series with an electrically insulating tube interposed therebetween. It is possible to make modifications such as grounding the flexible tube or wire bonding when one end of the flexible tube B is connected to the conductive tube A with an electrically insulating tube interposed therebetween. As a result, in any of these cases, grounding is performed for each pipe connecting portion.
[0009]
　1 to 6 as a specific example of the flexible tube B, the conductor B2 is formed so as to be exposed as a belt-like layer of a predetermined width extending in the axial direction of the tube body B1.
　Further, if necessary, a conductive wire (not shown) is helically sandwiched between the outer surface of the conductor B2 and the reinforcing member B3 so that the surface of the conductive wire is crimped to the outer surface of the conductor B2. Arrangement is preferred.
　In addition, although not shown as other examples, the shape of the conductor B2 may be changed to a linear shape, or the number of conductors B2 may be increased in the circumferential direction at predetermined intervals as described in Japanese Patent Laid-Open No. 2002-005372. Changes such as regular arrangement are possible.
[0010]
　The ground clip C according to the embodiment of the present invention is constructed by bending a conductive wire such as an elastically deformable metal wire.
　More specifically, the ground clip C comprises a coil portion 1 attached to the outer surface A1 of the conductive tube A and the outer peripheral surface of the flexible tube B, and radially protruding from both ends 11 and 12 in the axial direction of the coil portion 1. A pair of grip portions 2 facing each other in the circumferential direction are provided as main components.
　The earth clip C is configured such that the coil portion 1 is elastically expanded in diameter by a "pinch operation" in which the pair of knob portions 2 are pinched and moved relatively closer in the circumferential direction. In this diameter-expanded state, the coil portion 1 is elastically contracted and deformed by a "releasing operation" in which the gripping operation of the pair of knob portions 2 is loosened and the knob portions 2 are relatively moved apart in the circumferential direction.
[0011]
　The coil portion 1 is attached so as to wind along the outer peripheral surface of the flexible tube B, and is configured to tighten a predetermined portion of the flexible tube B in the axial direction in the radial direction.
　More specifically, the coil portion 1 can be moved axially along the outer peripheral surface of the flexible tube B by the diameter expansion deformation by the "pinch operation", and the flexible tube B by the diameter contraction deformation by the "release operation". Sized to tighten radially.
　In the case shown in FIGS. 1 to 6, since the flexible tube B is provided with reinforcing members B3 that protrude spirally, by screwing the coil portion 1 between the reinforcing members B3 (valley portions), , are arranged in the axial direction of the flexible tube B so as not to be displaced.
　As another example, although not shown, it can also be attached to a flexible tube B having a smooth (flat) outer peripheral surface that is not provided with a reinforcing member B3.
[0012]
　Furthermore, as shown in FIGS. 1 to 6, the coil portion 1 is preferably formed in a conical shape whose diameter gradually increases from the opening on the conductive tube A side toward the opening on the flexible tube B side. In this case, the inner diameter of the coil portion 1 on the one open end side facing the flexible tube B in the radial direction is larger than the inner diameter on the other open end side facing the conductive tube A in the radial direction.
　At one end 11 facing the flexible tube B and the other end 12 facing the conductive tube A in the coil portion 1, a pair of knob portions 2 are formed radially continuously in the radial direction of the coil portion 1. be.
　That is, one knob portion 21 is connected to either the one end portion 11 or the other end portion 12 of the coil portion 1, and the other knob portion 22 is connected to the other of the one end portion 11 or the other end portion 12. are connected.
　As shown in the figure, the knob portion 21 on one side and the knob portion 22 on the other side are preferably formed integrally by bending in the same manner as the coil portion 1 made of a conductive wire.
[0013]
　One knob portion 21 of the pair of knob portions 2 has an index portion 21 a having directivity in the axial direction of the coil portion 1 . The index portion 21a is a mark for alerting the operator of the attachment direction of the ground clip C to the conductive tube A and the flexible tube B, and is formed in an asymmetrical shape in the axial direction of the coil portion 1. As shown in FIG.
　On the other hand, the other knob portion 22 does not have the indicator portion 21a and is configured to have a structure different from that of the one knob portion 21, such as being formed in a symmetrical shape in the axial direction of the coil portion 1, for example.
　1 to 6 as an arrangement example of the index portion 21a, one knob portion 21 having the index portion 21a is attached to one end portion 11 of the large diameter side facing the flexible tube B in the coil portion 1. The other knob portion 22 that is continuously provided and does not have the indicator portion 21a is continuously provided to the other end portion 12 on the small diameter side facing the conductive tube A in the coil portion 1 .
　As a result, the knob portion 21 having the index portion 21a and the knob portion 22 not having the index portion 21a have an asymmetrical relationship. , 22, the feel of the fingertips is different. From these points of difference, the operator pays attention to the indicator portion 21a and recognizes it, and the knob portion 21 on one side and the knob portion 22 on the other side are identified. In addition, the orientation of the coil portion 1 can be recognized by the index portion 21a having an asymmetrical shape in the axial direction.
　In particular, the indicator portion 21a is preferably formed by bending before or after the one knob portion 21 is bent.
　Further, the indicator portion 21a preferably has a pointed portion 21b that protrudes in the axial direction of the coil portion 1. As shown in FIG. The cusp portion 21b is configured such that the directivity of the coil portion 1 in the axial direction can be easily recognized from the appearance or the feel of the fingertip, such as a sharply pointed shape.
[0014]
　1, 2(a) to 2(c) and 6(a) to 6(c) as an example (first embodiment) of the ground clip C, one knob portion 21 is omitted. The overall shape of one of the grip portions 21 is formed into a triangle by bending into a letter shape. As a result, the indicator portion 21a and the pointed portion 21b are formed integrally with one of the grip portions 21. As shown in FIG. The other knob portion 22 is bent into a substantially U-shape, and the overall shape of the other knob portion 22 is formed into a square.
　In the case shown in FIG. 3 as another example (second embodiment) of the ground clip C, one of the knob portions 21 is bent into a substantially V-shape so that the overall shape of the one knob portion 21 is triangular. ing. As a result, the indicator portion 21a and the pointed portion 21b are formed integrally with one of the grip portions 21. As shown in FIG. The other knob portion 22 is bent into a substantially U-shape, and the overall shape of the other knob portion 22 is formed into a square.
　In the case shown in FIG. 4 as another example (third embodiment) of the earth clip C, one knob portion 21 is bent into an annular shape so that the overall shape of the one knob portion 21 is formed into a substantially circular shape. . As a result, the indicator portion 21a is formed integrally with the knob portion 21 on one side. The other knob portion 22 is bent into a substantially U-shape, and the overall shape of the other knob portion 22 is formed into a square.
　In the case shown in FIG. 5 as another example (fourth embodiment) of the earth clip C, one knob portion 21 is bent into a substantially dogleg shape so that the overall shape of one knob portion 21 is formed into a triangle. ing. As a result, the indicator portion 21a and the pointed portion 21b are formed integrally with one of the grip portions 21. As shown in FIG. The other knob portion 22 is bent into an annular shape so that the overall shape of the other knob portion 22 is substantially circular.
[0015]
　Furthermore, in the illustrated example, the tip of one knob 21 radially protrudes in the radial direction of the coil portion 1 more than the tip of the knob 22 on the other side, and has a common configuration.
　As a result, in the illustrated example, although one of the knob portions 21 has the index portion 21a and the pointed portion 21b, the other knob portion 22 and the coil portion 1 are arranged to face each other in the circumferential direction. "Pinch operation" to move closer can be performed smoothly and has excellent operability.
　1, 2(a) to 2(c), 6(a) to 6(c) and 5, one of the knobs 21 is pointed at an acute angle. 21b, the directivity of the coil portion 1 in the axial direction is excellent, and a large area facing the other knob portion 22 in the circumferential direction of the coil portion 1 is ensured. Excellent stability.
　In the case shown in FIG. 3 , the approximately square-marked index portion 21 a and the pointed portion 21 b formed on one of the knob portions 21 are set larger in the axial direction of the coil portion 1 than the other knob portion 22 . Therefore, the directivity of the coil portion 1 in the axial direction is excellent without lowering the stability of the "pinch operation".
　In addition, although not shown as other modifications of the ground clip C, one knob portion 21 may be bent into a shape other than the illustrated example as an index portion 21a or a pointed portion 21b, or the other knob portion 22 may be bent into a U-shape or Modifications such as folding shapes other than annular are possible. Further, the tip of one knob portion 21 and the tip of the other knob portion 22 are similarly protruded in the radial direction of the coil portion 1, and the tip of the other knob portion 22 is arranged further than the tip of the one knob portion 21 in the coil portion. Modifications such as projecting radially in the radial direction of 1 are also possible.
　The indicator portion 21a and the pointed portion 21b of one of the knob portions 21 are not limited to those formed by the bending process shown in the drawing, and may be a separate member such as a separate part fixed to the one knob portion 21 or coated with paint. It is also possible to form an asymmetrical shape in the axial direction of the coil portion 1 by secondary processing.
[0016]
　Then, the working procedure of the pipe mounting structure D using the earth clip C according to the embodiment of the present invention will be described.
　As shown in FIGS. 6(a) to 6(c), the tube mounting structure D shown in FIG. The operation procedure for connecting to the conductive pipe A on the right side) will be described.
　First, the coil portion 1 is diameter-expanded and deformed by "pinch operation" of the pair of knob portions 2 of the earth clip C, and temporarily fixed by passing it through the conductive pipe A as shown in FIG. 6(a). At this time, it is necessary to arrange the coil portion 1 so that the large-diameter opening side of the coil portion 1 faces the flexible tube B. As shown in FIG.
　For this reason, in the illustrated example, one knob portion 21 connected to one end portion 11 on the large diameter side of the coil portion 1 and the indicator portion 21a are passed through the conductive tube A toward the flexible tube B. . Conversely, the side of the other knob portion 22 connected to the other end portion 12 on the smaller diameter side of the coil portion 1 faces the conductive tube A. As shown in FIG.
　Next, as shown in FIG. 6(b), one end of the flexible tube B (connection side end B1a on the right side in FIG. 1) is inserted into the conductive tube A on one side (right side in FIG. 1).
　Finally, as shown in FIG. 6(c), the coil portion 1 is moved toward the flexible tube B while being expanded and deformed by the “pinch operation” of the pair of knob portions 2, so that the coil portion 1 is flexible. After rotating in the circumferential direction about one turn or one and a half turns along the reinforcing member B3 protruding spirally from the flexible tube B, the "releasing operation" is performed.
　By this "releasing operation", one end portion 11 on the large diameter side of the coil portion 1 is elastically brought into close contact with the outer surface of the conductor B2 of the flexible tube B, and the opposite end portion 11 on the small diameter side of the coil portion 1 is brought into contact with the outer surface. The other end 12 elastically adheres to the outer surface A1 of the conductive tube A. As shown in FIG. Further, although not shown, it is preferable to prevent the flexible tube B from coming off from the conductive tube A using a fastener made of a spiral wire band or the like, if necessary.
　Following this, the other end of the flexible tube B (left connection side end B1a in FIG. 1) is connected to the other (left side in FIG. 1) conductive tube A. reverse and repeat the above steps.
　After a series of these operations are completed, it is confirmed whether or not the outer peripheral surface (conductor B2) of the flexible tube B and the outer surface A1 of the conductive tube A are in a conductive state, and the operation is completed.
[0017]
　According to the pipe mounting structure D and the earth clip C according to the embodiment of the present invention, the one knob portion 21 and the other knob portion 22 have an asymmetrical relationship depending on the presence or absence of the indicator portion 21a. For this reason, the operator can distinguish between the knob portion 21 and the indicator portion 21a on one side and the knob portion 22 on the other side, and the direction of the coil portion 1 can be easily recognized by the indicator portion 21a having an asymmetrical shape in the axial direction.
　As a result, the operator can recognize the one knob portion 21 side where the index portion 21a is located, and then arrange the one knob portion 21 side toward either the flexible tube B or the conductive tube A. become.
　Therefore, the operator can easily identify the correct mounting direction of the earth clip C and set it in the correct direction.
　As a result, even an inexperienced operator can easily connect the conductive tube A and the flexible tube B to the earth clip C, compared to the conventional one in which the pair of knobs have the same shape and the orientation of the coil is difficult to recognize. becomes electrically connectable via the
　Therefore, it is possible to reliably prevent explosions and fires due to electrostatic discharge in a combustible atmosphere. Furthermore, it is possible to prevent the coil portion 1 and the flexible tube B from being damaged due to the unreasonable inverse mounting of the coil portion 1 by the operator.
[0018]
　In particular, it is preferable to form the indicator portion 21a by bending.
　In this case, the indicator portion 21a can be easily formed by continuous bending before and after the bending of one of the knob portions 21 .
　Therefore, the indicator portion 21a can be easily manufactured without secondary processing.
　As a result, compared to a structure that requires secondary processing, the structure can be durable and cost reduction can be achieved.
　In addition, since the bent indicator portion 21a does not deform even when the ground clip C is removed when the flexible tube B is attached to or detached from the conductive tube A, the operator can permanently change the normal mounting direction of the ground clip C. It can be identified and can be set in the correct orientation for a long time.
[0019]
　Furthermore, it is preferable that the indicator portion 21a has a pointed portion 21b projecting in the axial direction of the coil portion 1. As shown in FIG.
　In this case, the directivity of the coil portion 1 in the axial direction can be easily recognized from the appearance and tactile sensation of the shape of the pointed portion 21b.
　Therefore, the operator can more easily identify the normal mounting direction of the ground clip C and set it in the correct direction.
　As a result, even an inexperienced operator can establish electrical connection between the conductive tube A and the flexible tube B through the earth clip C more reliably.
[0020]
　In the illustrated example of the above-described embodiment, one knob portion 21 having an indicator portion 21a is connected to one end portion 11 of the coil portion 1 facing the flexible tube B, and the coil facing the conductive tube A. Although the other knob portion 22 is connected to the other end portion 12 of the portion 1, it is not limited to this and may be arranged in reverse.
　That is, one knob portion 21 and the index portion 21a are connected to the other end portion 12 of the coil portion 1 facing the conductive tube A, and the other knob portion 22 that does not have the index portion 21a is connected to the flexible tube B. It is also possible to connect to the one ends 11 of the opposing coil portions 1 .
　Even with such a reverse arrangement setting, the same effects and advantages as the illustrated example can be obtained.
Code explanation
[0021]
　A Conductive tube A1 Outer surface
　B Flexible tube C Earth clip
　D Tube attachment structure 1 Coil part
　11 End (one end) 12 End (other end)
　2 Pair of knobs 21 One knob
　21a Indicator part 21b Point part

The scope of the claims

[Request item 1]
　A tube mounting structure in which a ground clip is attached across a grounded conductive tube and a flexible tube inserted into the outer surface of the conductive tube, wherein the ground clip is attached to the outer surface of the conductive tube and the flexible tube
　. A coil portion attached to the outer peripheral surface of a tube, and a pair of knob portions projecting from both ends in the axial direction of the coil portion and facing each other,
　wherein one knob portion of the pair of knob portions is attached to the coil portion. A pipe mounting structure characterized by having an asymmetrical indicator portion with directivity in an axial direction.
[Request item 2]
　2. The pipe mounting structure according to claim 1, wherein said indicator portion is formed by bending.
[Request Item 3]
　3. The pipe mounting structure according to claim 1, wherein said index portion has a pointed portion projecting in the axial direction of said coil portion.
[Request Item 4]
　A ground clip attached across a grounded conductive tube and a flexible tube inserted into the outer surface of the
　conductive tube, wherein the coil portion is attached to the outer surface of the conductive tube and the outer peripheral surface of the flexible tube. and a pair of knob portions projecting from both ends in the axial direction of the coil portion and facing each other,
　wherein one knob portion of the pair of knob portions has an asymmetrical shape with directivity in the axial direction of the coil portion. A ground clip characterized by having an index portion of