JP2004028301A - Fastener for splicing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener for splicing which can prevent the generation of wrong splicing condition. <P>SOLUTION: A pair of first pinching pieces 3 and 3 are projected from an upper position of a coupling piece 2, and a pair of second pinching pieces 4 and 4 are projected from a lower position thereof. Tip side parts of the first pinching pieces are opened into truncated chevron shape to form guide parts 31 and 31, and each intermediate part is formed with a small diameter pinching part 32, which is to be fitted on a small diameter part 24, by bending. Tip side parts of the second pinching pieces are similarly opened to form guide parts 81 and 81, and each intermediate part is formed with a large diameter pinching part 82, which is to be fitted on a large diameter part 13, by bending. A clearance 5 for insertion of a flange 12 is formed between the first pinching pieces and the second pinching pieces. An angular recessed part is formed in a lower edge side of the guide part of the first pinching pieces from a tip to the narrowest part 33 to form abutting parts 35 and 35. In the condition that a fitting part 23 is projected from a tip surface 14 of the flange to cause the wrong splicing, the abutment part abuts on the projecting part 23a to stop the push any more. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connecting fastener used to connect tubes or a tube and a bar-shaped member to each other by one-touch operation.
[0002]
[Prior art]
Conventionally, a fastener as shown in FIG. 8 has been used as this type of connection fastener. This is used particularly for connecting a large-diameter pipe and a small-diameter rod-shaped member inserted into the pipe so that they are prevented from coming off from each other. The illustrated fastener 1a includes a pair of first holding pieces 3a, 3a and a pair of second holding pieces 4, 4. Each of the first holding pieces 3a, 3a and the second holding pieces 4, 4 is open at its tip end in a U-shape (for example, an opening angle of about 60 degrees) to form guide portions 31a, 31a, 41, 41. On the other hand, each base end side is integrated by a connecting piece 2 bent in a U-shape in plan view, and is vertically interposed between the first holding pieces 3a, 3a and the second holding pieces 4, 4. A gap 5 having a predetermined interval is formed. The small-diameter holding portions 32, 32 are bent at intermediate portions of the first holding pieces 3a, 3a, and the large-diameter holding portions 42, 42 are bent at intermediate portions of the second holding pieces 4, 4. .
[0003]
As a connection example using the fastener 1a, FIG. 9 shows a case where a small-diameter rod-shaped sensor 21 is connected to a large-diameter mounting tube 11. In this case, the mounting pipe 11 penetrates a part of the outer peripheral surface of the pipe P through which the object to be detected by the rod-shaped sensor 21 flows, and is fixed so as to protrude outward. The mounting tube 11 has a flange 12 on the distal end surface, which is slightly thinner than the gap 5 and has a larger diameter than the second holding piece, and a large diameter holding member from the flange 12 to the base end side. The large-diameter portions 13 are formed so as to substantially match the inner diameters of the portions 42, 42 and to be clamped by the large-diameter clamping portions 42, 42. In addition, a concave hole 15 which opens upward and has an intermediate diameter between the small-diameter holding portion 32 and the large-diameter holding portion 42 is formed on the distal end surface 14 which is the upper end surface of the flange 12. On the other hand, the rod-shaped sensor 21 has a fitting portion 23 which can be fitted into the concave hole 15 substantially behind the detecting portion 22 at the front end, substantially matching the inner surface shape of the concave hole 15, and a fitting portion 23. Behind the small diameter holding portions 32, 32, the small diameter portions 24 are formed so as to substantially match the inner diameters of the small diameter holding portions 32, 32 and to be held by the small diameter holding portions 32, 32. An O-ring 25 for sealing is mounted on the distal end side of the fitting portion 23, and the fitting portion 23 and the O-ring 25 are inserted into the concave hole 15 while being pushed together with the O-ring 25, and a small diameter The step surface 26 with the portion 24 is set so as to be flush with the distal end surface 14 of the flange 12.
[0004]
Then, in order to connect using the fastener 1a, first, the rod-shaped sensor 21 is inserted from the concave hole 15 of the mounting tube 11, and the fitting portion 23 is fitted inside the concave hole 15. At this time, the rod-shaped sensor 21 is fitted while being slightly pushed in against the frictional resistance between the O-ring 25 and the concave hole 15 so that the step surface 26 and the front end surface 14 of the flange 12 are flush. (The state shown by the dashed line in FIG. 9). Next, the large-diameter portion 13 and the small-diameter portion 24 are pressed into the respective front end openings of the fastener 1a to utilize the spring elasticity of the first and second holding pieces 3a, 3a, 4, 4 to remove the fastener 1a. The small-diameter holding portions 32 are then externally fitted to the small-diameter portion 24 at the same time as the large-diameter holding portions 42 are fitted to the large-diameter portion 13 (see FIG. 10). As a result, the flange 12 is fitted into the gap 5, and the upper and lower surfaces of the flange 12 are sandwiched between the upper edges of the second holding pieces 4, 4 and the lower edges of the first holding pieces 3a, 3a. By the lower edges of the first holding pieces 3a, 3a, the step surface 26 of the fitting portion 23 and the distal end surface 14 of the flange 12 are kept flush with each other, that is, the rod-shaped sensor 21 is prevented from being pulled out upward. State. Thereby, the work of connecting and fixing the rod-shaped sensor 21 to the mounting tube 11 using the fastener 1a is completed.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional fastener for connection, since the fastener 1a could be pushed into a predetermined position, the worker may mistakenly recognize that the connection fixing work has been completed, and may be left in an incorrectly connected state. .
[0006]
That is, when the rod-shaped sensor 21 is pushed in against the frictional resistance between the O-ring 25 and the concave hole 15, the elastic repulsive force acts in a direction to cause the rod-shaped sensor 21 to jump outward (upward). become. For this reason, when pushing in the fastener 1a, the rod-shaped sensor 21 may be in a state of slightly jumping upward as shown in FIG. If the operator pushes the fastener 1 a strongly without noticing this state, the small-diameter holding portions 32, 32, which should be externally fitted to the small-diameter portion 24, are further opened outward and externally fitted to the outer peripheral surface of the fitting portion 23. Will be done. In this case, only the frictional force based on the elastic restoring force of the small-diameter holding portions 32, 32 acts as a stopper for the rod-shaped sensor 21, and the retaining force of the lower surface of the first holding pieces 3a, 3a on the step surface 26 is retained. Cannot work. Even if the fastener 1a is mounted in such a state, since the worker has pushed the fastener 1a to a predetermined position, it is easy to mistakenly recognize that the connection fixing work has been completed normally, and the incorrect connection state is left. May occur.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a connection fastener that can prevent an erroneous connection state from occurring before and reliably.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a state where the fitting portion protrudes from the concave hole, even if an attempt is made to perform a connection operation, the fastener cannot be physically pushed and mounted, and as a result, the occurrence of an incorrect connection state occurs. Is focused on being able to prevent the problem in advance.
[0009]
Specifically, in the present invention, two pairs of a pair of holding pieces that exhibit spring elasticity in the opening and closing direction are disposed at each of two positions in the upper and lower stages, and the two sets of holding pieces are respectively located at the base end side. Are integrally connected, the front end portion is opened, a gap is formed at a predetermined interval between the upper and lower two sets of holding pieces, and one of the pair of holding pieces has a small-diameter opposed surface of the intermediate portion. The small-diameter holding portion is formed by being bent to draw an arc, while the opposing surfaces of the intermediate portion are bent to draw a large-diameter arc on the other pair of holding pieces to form a large-diameter holding portion. The following specific items are now provided for the connection fasteners that are used. That is, a concave angle-shaped depression is formed when viewed from the gap side so that an abutting portion facing the front end side is formed with respect to the gap side of the tip side portion of the one pair of holding pieces ( Claim 1).
[0010]
According to this invention, in the case of the example described in the above-described prior art, if the fitting portion is slightly protruding from the concave hole, even if the fastener is pushed in and mounted, the protruding portion is attached to the protruding portion. Hits, and further pushing is physically impossible. This makes it possible for the worker to notice that the connection and fixing work cannot be performed normally, and to press the fitting portion again to restart the fastener mounting work. Is possible.
[0011]
As the reentrant concave in the present invention, the distal end portion of each of the holding pieces is opened in a C shape, and the concave portion is formed from the distal end position of the distal end portion to the narrowest portion of the small-diameter holding portion. Then, it is preferable to form the abutting portion at the most narrowed portion (claim 2). In this case, since the pair of abutting portions face the connection target and the pair of abutting portions are formed at the position of the narrowest portion, the amount of protrusion of the fitting portion is small. However, the abutting portion surely abuts, and further push-fitting can be more reliably disabled.
[0012]
【The invention's effect】
As described above, according to the connection fastener of claim 1 or claim 2, it is normal that the fastener is pushed and mounted in a state where one of the two connection objects is mounted flush with the other. If the connection target is not flush and if one of the above-mentioned connection objects protrudes slightly from the other, even if you try to push in the fastener, the butting part will be At the end, further pushing can be physically disabled. As a result, the operator can be made aware that the connection fixing operation cannot be performed normally, and the occurrence of an erroneous connection state can be prevented beforehand and reliably.
[0013]
In particular, according to the second aspect, since the pair of abutting portions are formed at the position of the narrowest portion, the abutting portion can be reliably abutted even if the amount of protrusion of the protruding portion is small. Further, it is possible to more reliably disable the fastener from being pushed and mounted in an abnormal state.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
<First embodiment>
FIG. 1 shows a connection fastener 1 according to a first embodiment of the present invention. This fastener 1 is similar to the fastener described in the section of the prior art, in that a small-diameter pipe or rod-like object (rod-like sensor 21: see FIG. 10) is used for a large-diameter pipe (mounting pipe 11: see FIGS. 9 and 10). It is used for connection fixing, and the connection fixing method and the principle of connection fixing are the same as those described in the section of the prior art. Hereinafter, a case where the shape and dimensions are specialized for connecting and fixing the rod-shaped sensor 21 to the mounting tube 11 will be described. Of course, the fastener 1 of this embodiment can also be used for connecting and fixing a small diameter pipe to a large diameter pipe.
[0016]
In FIG. 1, 2 is a connecting piece bent in a U-shape in plan view, 3 and 3 are a pair of first holding pieces protruding to one side from an upper position of the connecting piece 2, and 4 and 4 are A pair of second holding pieces protruding from the lower position of the connecting piece 2 in the same direction as the first holding pieces 3 and 3. A gap 5 having a vertical interval corresponding to the thickness of the flange 12 of the mounting tube 11 is formed between the first holding pieces 3 and 3 and the second holding pieces 4 and 4 which are arranged in two stages. ing. The connecting piece 2, the first holding pieces 3, 3 and the second holding pieces 4, 4 are formed as a single piece by cutting a single thin plate material exhibiting spring elasticity into a predetermined shape and then bending. It is a thing. Examples of the plate material include various metal plate materials including a spring plate material. Further, the fastener 1 may be formed by molding using a synthetic resin. Even if a spring plate is not used, it can be restored to its original shape when pushed open due to its structure and shape.
[0017]
Both distal end portions of the pair of first holding pieces 3 are opened in a U-shape (for example, an opening angle of about 60 degrees) in plan view to form guide portions 31, and both intermediate portions are vertically oriented. Are formed so as to draw a small-diameter arc around the central axis X of the small-diameter holding portion 32, 32. The inner diameter of the small-diameter holding portions 32, 32 facing each other is set to be substantially equal to or slightly smaller than the outer diameter of the small-diameter portion 24 of the rod-shaped sensor 21. The boundary between the two guide portions 31 and the small-diameter holding portions 32 becomes the most constricted portions 33.
[0018]
A recess 34 is formed in each of the guide portions 31 such that the lower edge side thereof is cut out in a reentrant shape from the most narrowed portion 33 to the distal end of the guide portion 31. A contact portion 35 (see also FIG. 2) is formed on the side.
[0019]
Similarly, the pair of second holding pieces 4, 4 have guide portions 41, 41 with both distal end portions opened in a C-shape (for example, an opening angle of about 60 degrees) in plan view in the same manner as described above. The two intermediate portions are bent so as to draw a large-diameter arc about the central axis X to form large-diameter holding portions 42, 42. The inner diameters of the opposed surfaces of the large-diameter holding portions 42, 42 are set substantially equal to or slightly smaller than the outer diameter of the large-diameter portion 13 of the mounting tube 11.
[0020]
When the rod-shaped sensor 21 is connected and fixed to the mounting tube 11 using the fastener 1 described above, the fitting portion 23 of the rod-shaped sensor 21 is inserted into the concave hole 15 of the mounting tube 11 as shown in FIGS. It is not fitted to the original premise position and leads to erroneous connection, that is, it is not fitted to the premise position where the step surface 26 of the fitting portion 23 is flush with the front end surface 14 of the flange 12 and the fitting portion 23 is not fitted. Is slightly protruded upward, even if the fastener 1 is pushed in and mounted, the respective abutting portions 35 abut against the protruding portion 23a of the fitting portion 23, and further pressing cannot be performed.
[0021]
For this reason, the worker can be made aware that the rod-shaped sensor 21 is not fitted to the original prerequisite position, and the worker who notices this pushes the fastener 1 in a state where the rod-shaped sensor 21 is further pushed in. Will do it again. As a result, it is possible to prevent an erroneous connection fixed state from occurring.
[0022]
<Second embodiment>
FIG. 4 shows a situation where the connection is fixed using the connection fastener 6 according to the second embodiment of the present invention. In the second embodiment, the first holding pieces 3 and 3 and the second holding pieces 4 and 4 are independent free ends in the first embodiment, respectively. One end of one holding piece 8 and one end of each second holding piece 9 are connected to each other. The other connection fixing method and connection fixing principle are the same as in the first embodiment.
[0023]
The second embodiment is suitably used for connecting and fixing pipes. In the second embodiment, as an example, a case where a small diameter pipe 41 is connected and fixed to a large diameter pipe 31 as shown in FIG. Will be explained.
[0024]
As a joint part of the large-diameter pipe 31, a flange 32 having a predetermined diameter and a predetermined thickness is formed on a distal end side (an upper end side in FIG. 4), and a large-diameter part 33 is formed on the base end side from the flange 32. . In addition, a concave hole 35 having a predetermined diameter is formed in the distal end surface 34 which is the upper end surface of the flange 32 and is opened at the distal end side. On the other hand, as a joint portion of the small-diameter pipe 41, a fitting portion 42 is formed on the distal end side (the lower end side in FIG. 4) which almost matches the inner surface shape of the concave hole 35 and can be fitted into the concave hole 35. A step surface 43 is formed between the fitting portion 42 and the small diameter tube 41. Further, an O-ring 44 for sealing is externally fitted to a position on the distal end side of the fitting portion 42. The fitting portion 42 is pushed into the concave hole 35 together with the O-ring 44 and slightly fitted, and is set so as to be flush with the step surface 43 and the distal end surface 34 of the flange 32.
[0025]
Next, the fastener 6 of the second embodiment will be described with reference to FIGS. In each of the drawings, 7 is a connecting piece bent in a U-shape in plan view, 8, 8 are a pair of first holding pieces protruding to one side from an upper position of the connecting piece 7, and 9 and 9 are A pair of second holding pieces projecting from the lower position of the connection piece 7 in the same direction as the first holding pieces 8. A through-hole-shaped gap 10 having a vertical interval corresponding to the thickness of the flange 32 is formed between the first holding pieces 8 and 8 and the second holding pieces 9 and 9 arranged in the upper and lower two stages. Have been. The connection piece 7, the first holding pieces 8, 8 and the second holding pieces 9, 9 are formed by cutting a single plate material similar to that described in the first embodiment into a predetermined shape, and then bending and forming an integrated body. It was formed.
[0026]
Both distal end portions of the pair of first holding pieces 8, 8 are opened in a U-shape (for example, an opening angle of about 60 degrees) in plan view to form guide portions 81, 81, and both intermediate portions are vertically oriented. Are formed so as to draw a small-diameter arc around the center axis X of the small-diameter holding portion 82, 82. The inner diameters of the opposing surfaces of the small-diameter holding portions 82 are set to be substantially equal to or slightly smaller than the outer diameter of the small-diameter tube 41.
[0027]
Similarly, the pair of second holding pieces 9, 9 have guide portions 91, 91 with both distal end portions opened in a C-shape (for example, an opening angle of about 60 degrees) in plan view in the same manner as described above. The two intermediate portions are bent so as to draw a large-diameter arc about the central axis X to form large-diameter holding portions 92, 92. The inner diameter of the opposing surfaces of the large-diameter holding portions 92, 92 is set substantially equal to or slightly smaller than the outer diameter of the large-diameter portion 33.
[0028]
The guide portion 81 of each of the first holding pieces 8 and the guide portion 91 of each of the second holding pieces 9 are integrally connected by tip connecting pieces 89, 89 at opposite ends in the vertical direction. Have been.
[0029]
In the first holding pieces 8, the boundary positions between the guide portions 81, 81 and the small-diameter holding portions 82, are the narrowest portions 83, 83. A recess 84 is formed so that the lower edge side of each of the guide portions 81 is cut out in a reentrant shape over 83. The recess 84 causes the abutment portion 85 below each of the most narrowed portions 83 (particularly see FIG. 6B). ) Is formed.
[0030]
In order to connect and fix the large-diameter pipe 31 and the small-diameter pipe 41 using the fastener 6, first, the fitting portion 42 of the small-diameter pipe 41 is inserted into the concave hole 35 of the large-diameter pipe 31 together with the O-ring 25. It is pushed into the concave hole 35 and slightly fitted therein. Next, in a state where the step surface 43 of the fitting portion 42 and the distal end surface 34 of the flange 32 are flush with each other (a state shown by a solid line in FIG. 7), each guide portion 81, 91 of the fastener 6 is moved to the large diameter. The fastener 6 is pressed against the portion 33 and the small-diameter pipe 41 from the side using the spring elasticity of the first and second holding pieces 8, 8, 9, 9 so that the large-diameter holding sections 92, 92 are enlarged. At the same time, the small-diameter holding portions 82 are externally fitted to the small-diameter tube 41 at the same time as being fitted to the diameter portion 33 (see the state shown by a solid line in FIG. 7). As a result, the flange 32 is fitted into the gap 10, and the upper and lower surfaces of the flange 32 are sandwiched by the upper edges of the second holding pieces 9, 9 and the lower edges of the first holding pieces 8, 8. By the lower edges of the first holding pieces 8, the step surface 43 and the distal end surface 34 of the flange 32 are flush with each other, that is, the small-diameter tube 41 is prevented from being pulled out upward. Thereby, the connection fixing operation using the fastener 6 is completed.
[0031]
When the fastener 6 is pushed in, as shown by the dashed line in FIG. The portion 85 collides with the protruding portion 42a of the fitting portion 42, and further pushing cannot be performed. Therefore, as in the first embodiment, the worker can be made aware that the fitting portion 42 of the small-diameter pipe 41 is not fitted to the original position, and the worker who notices this can remove the small-diameter pipe 41. In a state where the fastener is further pushed, the fastener 6 is pushed and mounted again. As a result, it is possible to prevent an erroneous connection fixed state from occurring.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a fastener according to a first embodiment of the present invention.
FIG. 2 is a partially cutaway side view showing a procedure for connecting and fixing using the fastener of the first embodiment.
FIG. 3 is a perspective view showing a connection operation process which can prevent occurrence of erroneous connection beforehand.
FIG. 4 is a partially cutaway perspective view showing a procedure for connecting and fixing using a fastener according to a second embodiment.
FIG. 5 is a perspective view showing a fastener according to the second embodiment.
6 shows the fastener of FIG. 5, FIG. 6 (a) is a plan view, and FIG. 6 (b) is a front view.
FIG. 7 is a front view showing a state where the fastener is connected and fixed using the fastener of the second embodiment.
FIG. 8 is a perspective view showing an example of a conventional fastener.
FIG. 9 is a partially cutaway front view showing a procedure for connecting and fixing using a conventional fastener.
FIG. 10 is a perspective view showing a state where connection and fixation are normally completed when a conventional fastener is used.
FIG. 11 is a perspective view showing a state in which incorrect connection and fixing are performed when a conventional fastener is used.
[Explanation of symbols]
1,6 Fastener 2,7 Connecting piece 3,8 First holding piece (one set of holding pieces)
4, 9 Second holding piece (the other set of holding pieces)
5, 10 Gap 31, 41, 81, 91 Guide part 32, 82 Small-diameter holding part 42, 92 Large-diameter holding part 33, 83 Most narrowed part 34, 84 Depression 35, 85 Butting part

Claims (2)

Two sets of a pair of holding pieces, which exhibit spring elasticity in the opening and closing direction, are provided at each of the upper and lower two-stage positions, and the two sets of holding pieces are integrally connected at their base end portions, respectively. A side portion is opened, a gap is formed at a predetermined interval between the upper and lower two sets of holding pieces, and the opposing surfaces of the intermediate portion are bent to form a small-diameter arc on one of the pair of holding pieces, thereby reducing the diameter. While the holding portion is formed, the other pair of holding pieces are connection fasteners in which the opposing surfaces of the intermediate portion are bent so as to draw a large-diameter arc to form a large-diameter holding portion,
On the gap side of each tip side portion of the one pair of holding pieces, there is formed a reentrant recess as viewed from the gap side so as to form an abutting portion facing the tip side. Fastener for connection. The connection fastener according to claim 1,
The tip-side portion of each of the holding pieces is opened in a C shape, and the reentrant concave is formed from the tip-side position of the tip-side portion to the narrowest portion of the small-diameter holding portion. A fastener for connection having a butted portion.

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