JP2011133019A - Piping clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit faults such as sink and distortion deformation peculiar to resin, furthermore save the weight, and reduce the cost on the premise of a synthetic resin molding. <P>SOLUTION: A piping clamp is formed in a rectangular solid shape as a whole by integrally molding a synthetic resin, the piping clamp is also provided on the top surface with depressions 12 and 12 having an arc-like cross-section in which a part of the outer circumference of a pipe P is fitted, and then formed with surrounding ribs 16 on four sides and intermediate ribs 17 and 17 between front and rear sides when the direction in which the depressions 12 and 12 extend directly under the center of the depressions 12 and 12 is designated as a front-rear direction, whereby a first resin theft portion 14 and second resin theft portions 15 and 15 are provided in the center and both right and left sides on the under surface, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe clamp for fixing a pipe (flexible hose, metal pipe or synthetic resin pipe) such as a hydraulic pipe in a construction machine such as a hydraulic excavator.

  As this type of piping clamp, as shown in Patent Documents 1 and 2, a rectangular thick metal plate is generally formed by performing necessary machining, but this metal clamp is Since it is heavy and has the disadvantages of high material cost and high processing cost, a cheap and light synthetic resin such as polypropylene is proposed instead.

  This conventional synthetic resin clamp is shown in FIGS.

  Here, a two-clamp that simultaneously fixes two pipes is taken as an example.

  The entire clamp 1 is formed in the shape of a rectangular parallelepiped block (block) by integral molding of synthetic resin.

  The clamp 1 is provided with two recesses 2 and 2 having a circular arc cross section in which a part of the outer periphery of the pipes P and P is fitted in parallel on both sides of the upper surface, and a central portion (a portion between the recesses 2 and 2). ) Is provided with a rectangular through-hole 3, and this through-hole 3 is fitted into a rectangular parallelepiped fixing member 5 which is welded and fixed to a piping target member (for example, a side plate of a boom in a work attachment of a hydraulic excavator). As a result, the clamp 1 is fixed to the piping target member 4.

  In this specification, the direction in which the recesses 2 and 2 are arranged is referred to as left and right, the direction in which the recesses 2 and 2 extend is referred to as front and rear, and the direction in which the through holes 3 extend is referred to as up and down.

  7 and 8, 6 is a screw hole provided at the center of the fixing member 5, and FIGS. 7 and 9 are welding of the fixing member 5, which is applied to a rectangular region surrounding the through-hole 3 on the lower side of the clamp. It is a resin stealing part for bead escape.

  6 and 7 show the clamp 1 in use.

  As shown in the figure, the clamp 1 is fixed to the pipe target member 4 by the fixing member 5, and then the pipes P and P are set in the concave portions 2 and 2 on both sides, and the presser plate 9 is attached to the both sides via the cylindrical spacer 8 thereon. Cover the pipes P and P.

  The presser plate 9 is provided with a bolt through hole 9a (see FIG. 7) in the center, and the tightening bolt 10 is passed through the bolt through hole 9a and the spacer 8 and screwed into the screw hole 6 of the fixing member 5, whereby the presser plate 9 Then, press both pipes P and P into the clamp 1 and fix them.

JP 2002-39440 A Japanese Patent Laid-Open No. 9-71969

  However, according to the conventional synthetic resin clamp 1, first, the resin stealing portion 7 is provided only at the center portion surrounding the through hole 3 on the lower surface side, and the wall thicknesses of the left and right side portions and the front and rear side portions are the same. Since the difference is large, defects specific to the resin such as sink marks and distortion deformation are likely to occur on the peripheral side surface and the upper surface including the concave portions 2 and 2.

  For this reason, poor piping attachment, such as pipes P and P not being fitted to the concave portions 2 and 2 and not being properly tightened due to, for example, distortion deformation of the concave portions 2 and 2, has occurred.

  Second, since the stealing portion 7 is limited to the central portion as described above, only the specific gravity difference of the material is reduced compared to the metal clamp, the material saving effect is low, and the weight and cost are still reduced. It was insufficient.

  Accordingly, the present invention provides a pipe clamp that can suppress the occurrence of defects such as sink marks and distortion deformation peculiar to a resin, and can realize further weight reduction and cost reduction on the premise of a synthetic resin molded product.

  In the invention of claim 1, the whole is formed in a rectangular parallelepiped shape by integral molding of synthetic resin, and the upper surface is provided with a concave portion having an arc-shaped cross section into which a part of the outer periphery of the pipe is fitted, while the peripheral ribs and the concave portions are provided on the four circumferences. In the state where the intermediate rib is formed in the part between the two front and rear sides when the direction in which the concave portion extends in the front-rear direction below, the resin stealing part is provided on the lower surface side.

  According to a second aspect of the present invention, in the configuration of the first aspect, in the state where the concave portion is provided on both the left and right sides of the upper surface and the intermediate rib is formed on both the left and right sides, The second resin stealing portion is provided on each of the left and right sides.

  According to a third aspect of the present invention, in the configuration of the first aspect, the concave portion is provided on one of the left and right sides of the upper surface, and the intermediate rib is formed on the left and right sides of the lower surface on the side where the concave portion is provided. A first resin stealing portion is provided on the side opposite to the concave portion on the side, and a second resin stealing portion is provided on the concave side.

  According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the thicknesses of the peripheral rib and the intermediate rib are set to be substantially the same.

  According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the intermediate rib is formed immediately below a central portion of the concave portion.

According to the synthetic resin clamp of the present invention (Claim 2 is a clamp for two pipes, Claim 3 is a clamp for single pipe), there are peripheral ribs on the four sides, and intermediate ribs on the part between the front and rear sides below the recess. Since the resin was stolen on the lower surface side in the state of being formed,
(i) The volume of the stolen part (material saving amount) is larger than that of a conventional synthetic resin clamp,
(ii) The fact that there is no part with a large difference in wall thickness makes it possible to reduce costs and reduce weight compared to conventional synthetic resin clamps while suppressing the occurrence of defects specific to synthetic resins such as sink marks and distortion deformation. can do.

  Further, since the volume of the stealing portion is large, the entire clamp is easily elastically deformed by the tightening force, so that the pipe fixing state can be stabilized.

  In addition, since the intermediate rib is disposed below the concave portion where the pipe is installed, the intermediate rib ensures a necessary strength against the tightening force and exhibits a sufficient pipe clamping force.

  According to the invention of claim 4, since the thicknesses of the peripheral rib and the intermediate rib are set to be substantially the same, the effect of suppressing sink and distortion deformation is further enhanced.

  Further, according to the invention of claim 5, since the intermediate rib is disposed directly under the concave portion, that is, on the line on which the tightening force acts, the clamping strength of the clamp can be further increased.

It is sectional drawing of the use condition of the piping clamp which concerns on 1st Embodiment of this invention. It is a bottom view of the clamp. It is the perspective view seen from the lower surface side of the clamp. It is sectional drawing of the use condition of the piping clamp which concerns on 2nd Embodiment of this invention. It is a bottom view of the clamp. It is a perspective view of the use condition of the conventional synthetic resin clamp. FIG. It is the same exploded perspective view. It is the perspective view seen from the lower surface side of the clamp.

  An embodiment of the present invention will be described with reference to FIGS.

  The first embodiment is applied to a two-pipe clamp, and the second embodiment is applied to a single-pipe clamp.

1st Embodiment (refer FIGS. 1-3)
In the clamp 11 of the first embodiment,
(I) The whole is formed in a rectangular parallelepiped shape by integral molding of synthetic resin such as polypropylene,
(II) On the left and right sides of the upper surface, there are provided in parallel two recesses 12 and 12 having a circular arc cross-section into which a part of the outer periphery of the pipes P and P is fitted, and a square through hole 13 is provided in the center. The point that the clamp 11 is fixed to the piping target member 4 by fitting the through hole 13 to the rectangular parallelepiped fixing member 5 fixed to the piping target member 4 by welding,
(III) At the time of pipe clamping, after setting the pipes P and P in the concave parts 12 and 12 on both sides, the presser plate 9 is put on both the pipes P and P via the spacers 8 and the fastening bolts 10 are passed through the bolts. The point that the pipes P and P are pressed and fixed by the holding plate 9 by screwing them into the screw holes 6 of the fixing member 5 through the holes 10 and the spacers 8 is the conventional synthetic resin clamp 1 shown in FIGS. Is the same.

  On the lower surface side of the clamp 11, a rectangular region surrounding the through hole 13, that is, a first resin stealing portion 14 is provided in the center portion, and a rectangular second shape that is long in the front-rear direction on both the left and right sides. Two resin stealing portions 15, 15 are provided.

  By the first and second resin stealing portions 14, 15, 15, peripheral ribs 16... Are formed around the four circumferences, and intermediate ribs 17, 17 are formed vertically and continuously below the recess.

  In addition, about the ribs 16 and 17 in FIG. 2, it has shown with the oblique line in order to make these ranges easy to understand.

  Here, the wall thickness dimensions A and B (see FIG. 2) of the peripheral and intermediate ribs 16 and 17 are set to be substantially the same (may be completely the same).

  Further, the intermediate ribs 17 and 17 are provided directly below the center of the recesses 12 and 12, that is, at a position where the center O coincides with the centers of the recesses 12 and 12, as shown in FIG.

  The first and second resin stealing portions 14 and 15 may be provided at the same depth, but in the embodiment, the second resin stealing portion 15 is replaced by the first resin stealing portion 14 as shown in FIG. Is set deeper.

In this way, the resin stealing portions 14, 15 and 15 are provided on the lower surface side in a state where the peripheral ribs 16 are formed on the four circumferences, and the intermediate ribs 17 and 17 are formed on the portions between the two front and rear sides below the concave portions 12 and 12, respectively. Because I gave
(i) The total volume (material saving amount) of the stealing portions 14, 15 and 15 is larger than that of the conventional synthetic resin clamp 1 shown in FIGS.
(ii) The fact that there is no part with a large difference in wall thickness makes it possible to reduce costs and reduce weight compared to conventional synthetic resin clamps while suppressing the occurrence of defects specific to synthetic resins such as sink marks and distortion deformation. can do.

  In this case, since the wall thickness dimensions A and B of the peripheral ribs 16... And the intermediate ribs 17 and 17 are set substantially the same, the effect of suppressing sink marks and distortion deformation is further enhanced.

  Further, since the entire volume of the stealing portions 14, 15, and 15 is large, the entire clamp is easily elastically deformed by the tightening force in the pipe mounting state shown in FIG. 1, and thus the pipe fixing state can be stabilized.

  In addition, since the intermediate ribs 17 and 17 are disposed below the recesses 12 and 12 in which the pipes P and P are installed, the intermediate ribs 17 and 17 secure a necessary strength against the tightening force, and a sufficient pipe clamp. Demonstrate power.

  In this case, since the intermediate ribs 17 and 17 are disposed directly below the central portions of the recesses 12 and 12, that is, on the line on which the tightening force acts, it is possible to further increase the tightening strength.

Second embodiment (see FIGS. 4 and 5)
The clamp 21 according to the second embodiment is suitable for fixing one large-diameter pipe P ′.

  Only differences from the clamp 11 of the first embodiment will be described.

  In this clamp 21, a concave portion 22 having a circular arc section with a larger radius than that of the first embodiment is provided only on the left and right sides of the upper surface, and a rectangular through hole 23 is provided in a portion other than the concave portion 22. .

  On the lower surface side of the clamp 21, a first resin stealing portion 24 is provided in a rectangular region surrounding the through hole 23 (on the side opposite to the recess 22), and a second resin stealing portion 25 is provided on each of the left and right sides.

  Accordingly, the peripheral ribs 26 are formed on the four sides, and the intermediate ribs 27 are formed on the left and right sides and directly below the concave portion 22.

  Note that the second resin stealing portion 25 is set wider than the second resin stealing portion 15 in the first embodiment because the radius of the recess 22 is large.

  The presser plate 28 according to the second embodiment is bent into a bowl shape as shown in FIG. 4 and is put on the pipe P ′ in a state where the lower end surface of the vertical portion is in contact with the pipe target member 4. Tighten and fix with. In FIG. 4, 28 a is a bolt through hole of the presser plate 28.

  The clamp 21 of the second embodiment can basically obtain the same effect as the clamp 11 of the first embodiment.

Other embodiments
(1) The intermediate ribs 17 and 27 are preferably provided directly below the center of the recess 22, but may be provided at a position slightly shifted from the center of the recess 22 to the left and right sides.

  (2) In the above embodiment, the configuration in which the through holes 13 and 23 are fitted to the fixing member 5 and the clamps 11 and 21 are attached to the piping target member 4 is exemplified. Various other mounting structures can be selected.

  (3) In the above embodiment, two types of clamps 11 and 21 for two pipes and one pipe are taken as an example, but the present invention can also be applied to clamps that simultaneously fix three or more pipes. it can.

  In this case, the peripheral ribs and the intermediate ribs may be formed by applying the first and second resin stealing portions with two adjacent concave portions and a portion between them as one unit.

11, 21 Clamp 12, 12, 22 Recess 14, 24 First resin stealing part 15, 25 Second resin stealing part 16, 26, 26 Peripheral rib 17, 17, 27 Intermediate rib P, P 'Piping

Claims (5)

  The whole is formed in the shape of a rectangular parallelepiped by integral molding of synthetic resin, and the upper surface is provided with a circular arc-shaped concave portion into which a part of the outer periphery of the pipe is fitted, while the peripheral rib is provided on the four circumferences, and the concave portion extends below the concave portion. A pipe clamp characterized in that a resin stealing portion is provided on the lower surface side in a state where intermediate ribs are respectively formed in a portion between two front and rear sides in a case where the front-rear direction is set to be the front-rear direction.   In the state where the concave portion is provided on both the left and right sides of the upper surface, and the intermediate rib is formed on the left and right sides, a first resin stealing portion is provided at the center portion on the lower surface side, and a second resin stealing portion is provided on the left and right sides. The piping clamp according to claim 1, wherein:   In the state where the recess is provided on one side of the upper surface and the intermediate rib is formed on the side where the recess is provided on both the left and right sides of the lower surface, a first resin stealing portion on the opposite side of the recess on the lower surface side, The piping clamp according to claim 1, wherein a second resin stealing portion is provided on each of the concave portions.   The pipe clamp according to any one of claims 1 to 3, wherein the wall thickness of the peripheral rib and the intermediate rib is set to be substantially the same.   The pipe clamp according to any one of claims 1 to 4, wherein the intermediate rib is formed in a portion directly below a central portion of the concave portion.

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