JP2019196834A - Retaining tool and joint structure - Google Patents

Abstract

To provide a retaining tool capable of being easily removed even in a case where a joint pin rotates.SOLUTION: A retaining tool is for preventing a joint pin that connects a plurality of members from falling out, and comprises: a retaining body having a notch that is open in one direction and whose inner edge is fitted into an engaging groove formed over the entire circumference of the joint pin; and a slip-off preventing mechanism disposed on the retaining body, for preventing the notch from being detached from the joint pin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retaining tool and a coupling structure.

  For example, as a structure that couples a plurality of members in a separable manner, a structure in which a coupling pin is inserted into a coupling hole formed in an overlapping portion of the plurality of members is widely adopted. In such a coupling structure, in order to prevent the coupling pin from falling out unintentionally, a head larger than the coupling hole is provided at one end of the coupling pin, and the coupling pin is exposed through the coupling hole. Generally, a radial through hole is formed at the end, and a shaft-shaped retaining tool is inserted into the through hole (see, for example, JP-A-2017-26011).

  In such a coupling structure, when the coupling pin rotates, components disposed in the vicinity of the coupling portion of the members coupled in the direction in which the retaining tool is pulled out may interfere with each other so that the retaining tool cannot be pulled out. In this case, when separating a plurality of members, it is necessary to rotate the connecting pin so that the retainer can be pulled out. However, for example, in a boom coupling structure of a construction machine, a plurality of members and a coupling pin are large, and it is not easy to rotate the coupling pin so that the coupling pin can be pulled out.

  In the case of a relatively small coupling pin, as a structure to prevent the coupling pin from falling off, a C-shaped or E-shaped retaining ring (snap ring) is engaged with a groove formed annularly over the entire circumference of the coupling pin. A structure may be adopted. The retaining ring is engaged with the engaging groove of the coupling pin in a state where the inner diameter is increased by being elastically deformed. For this reason, when a retaining ring is applied to the large member coupling structure as described above, it becomes difficult to elastically deform due to the large retaining ring, which is not practical.

JP 2017-26011 A

  In view of the above inconveniences, an object of the present invention is to provide a retainer that can be easily removed even when a coupling pin rotates, and a coupling structure that can be easily separated.

  A retaining device according to one aspect of the present invention made to solve the above-described problem is a retaining device that prevents a coupling pin that joins a plurality of members from falling off, and is opened in one direction, and has an inner edge. A retainer body having a notch that fits in an engagement groove formed in a circumferential direction on an outer periphery of the coupling pin; and provided in the retainer body, wherein the notch is detached from the coupling pin. And a detachment prevention mechanism for preventing.

  The retaining tool can prevent the coupling pin from falling off by fitting the inner edge of the notch of the retaining body into the engagement groove of the coupling pin. Furthermore, the removal prevention tool can more reliably prevent the coupling pin from falling off by preventing the removal prevention mechanism from unintentionally detaching from the coupling pin. Further, since the retainer is fitted in the engagement groove formed in the circumferential direction on the outer periphery of the coupling pin, the engagement groove is formed around the axis of the coupling pin in a state of being fitted in the engagement groove. Can be rotated within a range in which. For this reason, the retainer can be easily removed by turning the retainer main body relative to the coupling pin so as to point in the direction in which there are no other components that become obstacles.

  In the retainer, the side edge of the retainer main body on the side where the notch is opened may protrude outward from the detachment prevention mechanism. In this way, the side edge of the retaining body on the side where the notch is opened protrudes outward from the retaining mechanism, so that other objects come into contact with each other and the retaining mechanism is unintentionally released. Thus, the release stopper can be prevented from being detached, and the coupling pin can be further prevented from falling off.

  In the retainer, the anti-slip mechanism may include an annular body that is disposed so as to surround the coupling pin. As described above, the anti-separation mechanism includes the annular body disposed so as to surround the coupling pin, thereby preventing the retaining body from being detached from the engaging groove with a relatively simple configuration. it can.

  In the retainer, the annular body may be formed of a linear spring material, and the vicinity of both ends may be held parallel and spaced apart from each other. In this way, the annular body is formed of a linear spring material, and the vicinity of both ends are held parallel and spaced apart from each other. Since the notch is disposed at a position surrounding the coupling pin in a state in which the notch is fitted in the engagement groove, it is possible to easily and reliably prevent the retaining tool from being detached from the coupling pin.

  A coupling structure according to another aspect of the present invention includes a retaining member, a coupling pin having an engagement groove into which the notch of the retaining device fits, a first member coupled with the coupling pin, and a first member Two members.

  Since the coupling structure includes the above-described retainer that can be easily removed even when the coupling pin rotates, the first member and the second member can be easily separated.

  In the coupling structure, the first member may have a detent portion that abuts against a side edge of the retaining body and prevents the retaining body from rotating around the coupling pin. In this manner, the first member has a rotation preventing portion that contacts the side edge of the retaining body and prevents the retaining body from rotating around the coupling pin, so that the retaining body is the first member. Since the member or the second member is held in a certain direction, the removal tool can be further easily removed from the coupling pin.

  In the coupling structure, the engagement groove may be formed over the entire circumference of the coupling pin. As described above, the engagement groove is formed over the entire circumference of the coupling pin, so that the retainer can be freely rotated 360 degrees around the axis of the coupling pin. For this reason, the retaining device rotates the retaining body to an appropriate angular position regardless of the rotational position of the coupling pin, even when the direction in which other components do not exist in the vicinity of the coupling pin is limited. Can be removed by moving.

  Note that the “spring material” is not limited to the material labeled “for spring” in standards such as JIS, and includes materials that can be used as springs such as piano wire and stainless steel wire.

  As described above, the retainer according to one aspect of the present invention can be easily removed even when the coupling pin rotates. Moreover, since the coupling | bonding structure which concerns on another aspect of this invention can remove a retaining tool easily even if a coupling pin rotates, isolation | separation with a 1st member and a 2nd member is easy.

It is a typical perspective view which shows the retainer tool of one Embodiment of this invention. FIG. 2 is a schematic plan view of the retaining tool of FIG. 1. It is a typical side view of the retainer tool of FIG. It is a typical perspective view which shows a coupling structure provided with the retainer in FIG. FIG. 5 is a schematic cross-sectional view of the coupling structure of FIG. 4. It is a typical perspective view which shows the modification of the retainer tool of FIG. It is a typical perspective view which shows the modification different from FIG. 6 of the retainer tool of FIG. It is a typical perspective view which shows the modification different from FIG.6 and FIG.7 of the retainer tool of FIG. It is a typical perspective view which shows the modification of the coupling structure of FIG. It is typical sectional drawing which shows the modification different from FIG. 9 of the coupling | bonding structure of FIG. FIG. 11 is a schematic plan view showing a modified example different from FIGS. 9 and 10 of the coupling structure of FIG. 4.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Retaining tool]
1 to 3 show a retainer 1 according to one embodiment of the present invention. As shown in FIGS. 4 and 5, the retainer 1 is attached to the tip of the coupling pin 4 in a coupling structure in which the first member 2 and the second member 3 are coupled by the coupling pin 4. 4 prevents the first member 2 and the second member 3 from separating due to falling off. As shown in FIGS. 4 and 5, the retaining tool 1, the coupling pin 4 to which the retaining tool 1 is attached, and the first member 2 and the second member 3 coupled by the coupling pin 4 are provided. The coupling structure provided is an embodiment of the coupling structure according to the present invention.

  Although it does not specifically limit as the 1st member 2 and the 2nd member 3, For example, two adjacent lattice structures among several lattice structures which are connected and comprise the boom and jib of a crane, are connected so that rocking is possible. The advantages of the present invention are particularly significant when both the tip of the boom and the base end of the jib are large structures.

  The retainer 1 includes a retainer body 6 that engages with an engagement groove 5 that is formed in an annular shape over the entire outer periphery of the distal end portion of the coupling pin 4, and the retainer body 6 is connected to the coupling pin 4. And a detachment prevention mechanism 7 for preventing the detachment.

  The retaining body 6 has a notch 8 whose inner edge fits into the engaging groove 5 of the coupling pin 4. On the other hand, a part of the locking mechanism 7 is arranged at the opening of the notch 8 so that the notch 8 of the retaining body 6 can be prevented from being detached from the engaging groove 5 of the coupling pin 4, and this removal. The separation preventing state is released, and the notch 8 can be detached from the engagement groove 5 of the coupling pin 4 and can be fitted into the engagement groove 5. As a specific example, the locking mechanism 7 of the present embodiment includes an annular body 9 that is disposed so as to surround the coupling pin 4 and a holding block 10 that holds the annular body 9.

<Retaining body>
The retainer main body 6 is formed of a plate material, is open in one direction, and has a notch 8 whose inner edge fits into the engagement groove 5 of the coupling pin 4. The shape of the inner edge of the notch 8 has a width slightly larger than the diameter of the bottom of the engagement groove 5 so that the engagement groove 5 can be engaged, and the inner part corresponds to the engagement groove 5. It is preferable to use a “U” shape formed in a semicircular shape.

  It is preferable that the side edge of the retaining body 6 on the side where the notch 8 is opened protrudes outward from the detachment preventing mechanism 7 when viewed from the coupling pin 4 in the engaged state. As described above, the side edge of the retaining body 6 protrudes outward from the locking mechanism 7, so that other objects abut against the locking mechanism 7 and unintentionally release the locking mechanism 7 and come off. It is possible to prevent the stop main body 6 from being brought into a state where it can be detached from the coupling pin 4. As a specific example, for example, when the retaining tool 1 is used for a boom or jib of a crane, the rope comes into contact with the detachment preventing mechanism 7 so that the retaining tool 1 can be detached from the coupling pin 4. Can be prevented.

  In order to more reliably prevent other objects from unintentionally releasing the locking mechanism 7, the other side edge where the notch of the retaining body 6 does not open also projects outward from the locking mechanism 7. More preferably. That is, it is preferable that the retaining body 6 includes the retaining mechanism 7 except for the inside of the notch 8 in plan view (viewed in the axial direction of the coupling pin 4) as shown in FIG.

  Examples of the material of the retaining main body 6 include iron and stainless steel. Further, the thickness of the retaining main body 6 may be set to a thickness that does not deform due to the force acting in the direction in which the connecting pin 4 is pulled out. The retaining body 6 is designed so that the engagement groove 5 of the coupling pin 4 does not fit to the inner part of the notch 8 and is not deformed even when engaged only with the opposing linear part of the notch 8. It is preferred that

<Release prevention mechanism>
As described above, the detachment prevention mechanism 7 of the present embodiment includes the annular body 9 disposed so as to surround the coupling pin 4 and the holding block 10 that holds the annular body 9.

  The annular body 9 is formed of a linear spring material, and both end portions are held by the holding block 10 so as to be parallel and spaced apart from each other. As shown in FIG. 3, the annular body 9 can be rotated around an end portion held by the holding block 10. In addition, it is intended that “the vicinity of both ends” can be one having a retaining structure at the outermost end, such as the annular body 9 shown in the figure.

  Further, the annular body 9 is preferably formed so as to relieve internal stress in a state of surrounding the coupling pin 4 so as to be in a state of surrounding the coupling pin 4 by elastic force, and if the retaining body 6 is not present. It is more preferable that the internal stress is minimized in a state where it is rotated so as to protrude into the back space of the retaining body 6.

  Such an annular body 9 is distorted in shape when the vicinity of both ends held by the holding block 10 is rotated around the holding block 10 so as to be detached from the coupling pin 4 because the holding positions of the both ends are shifted. Accumulate elastic energy. Due to this elastic energy, the annular body 9 returns to a state surrounding the coupling pin 4.

  Since the annular body 9 surrounds the coupling pin 4 in this way, the retaining body 6 fitted in the engagement groove of the coupling pin 4 is prevented from being detached from the coupling pin 4, so that the coupling pin 4 It is more reliably prevented that the first member 2 and the second member 3 fall out.

  The thickness of the annular body 9 is such that the elastic force by the above-described elastic energy allows the user to easily rotate the annular body 9 and does not unintentionally rotate to release the stopper. Selected.

  The cross-sectional shape of the spring material forming the annular body 9 is typically a circular shape, but may be an arbitrary shape such as a polygon. When the cross-sectional shape of the annular body 9 is a non-circular shape, it may have a configuration in which a cylindrical sleeve is mounted in the vicinity of both ends so that the holding block 10 can be rotatably held.

  Further, the elastic force of the annular body 9 can also be adjusted by the positional relationship of the vicinity of both ends held by the holding block 10. Specifically, the elastic force of the annular body 9 can be increased by increasing the distance between the vicinity of both ends of the annular body 9.

<First member>
The first member 2 has a pair of plate-like portions 11 at a tip portion to be joined with the second member 3, and a configuration in which a coupling hole 12 into which the coupling pin 4 is inserted is formed in the plate-like portion 11. can do. Thus, since the first member 2 has the pair of plate-like portions 11, the coupling pin 4 is held in a fixed direction at the distal end portion of the first member 2, and the second member 3 is centered on the coupling pin 4. Can be connected so as to be relatively swingable.

<Second member>
The second member 3 has a single plate-like portion 13 that is inserted between the pair of plate-like portions 11 of the first member 2 at the distal end portion coupled to the first member 2, and this plate-like portion. The coupling hole 14 into which the coupling pin 4 is inserted can be formed in 13. Thus, since the second member 3 has the plate-like portions 13 inserted into the pair of plate-like portions 11 of the first member 2, the coupling between the first member 2 and the second member 3 is relatively accurate and It becomes easy.

<Coupling pin>
As shown in FIG. 5, the coupling pin 4 has a large-diameter head 15 that cannot be inserted into the first member 2 and the second member 3 at one end, and the retainer 1 is attached near the other end. A joint groove 5 is formed.

  As a cross-sectional shape of the engaging groove 5 (a shape in a cross section passing through the central axis of the coupling pin 4), a linear side wall so that a contact area with the retaining body 6 of the retaining tool 1 can be increased, It is preferable to use a rectangular shape having a linear bottom wall that can reduce the gap with the retaining body 6.

  The width of the engagement groove 5 is slightly larger than the inner edge portion of the notch 8 of the retainer 1 so that the inner edge portion of the notch 8 can be easily inserted. Further, the depth of the engagement groove 5 is selected so as to ensure a sufficient engagement area (overlapping area in the axial direction view) with the retaining body 6.

<Advantages>
The retaining tool 1 can prevent the coupling pin 4 from falling off by fitting the inner edge of the notch 8 of the retaining body 6 into the engagement groove 5 of the coupling pin 4. Further, the retaining tool 1 prevents the coupling pin 4 from coming off from the first member 2 and the second member 3 by preventing the unseparating mechanism 7 from unintentionally detaching from the coupling pin 4. It can be surely prevented.

  Further, since the retainer 1 is fitted in the engagement groove 5 formed over the entire circumference of the coupling pin 4, it can be freely moved around the axis of the coupling pin 4 while being fitted in the engagement groove 5. It can be rotated. For this reason, the retaining tool 1 can be removed in any direction perpendicular to the coupling pin 4 regardless of the rotational position of the coupling pin 4, so that the removal is easy.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, the components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

  The retaining device according to the present invention is configured such that the side edge of the retaining body 6a is bent to the side where the retaining mechanism 7 is provided, as in the retaining device 1a shown in FIG. You may form the protective wall 16 in a side edge. Thus, by forming the protective wall 16 on the side edge of the retaining main body 6a, it is possible to more reliably prevent other objects from unintentionally releasing the retaining mechanism 7.

  In the following description, the same components as those illustrated in FIGS. 1 to 5 are denoted by the same reference numerals, and the corresponding components that are not the same, but are denoted by the same reference numerals, A duplicate description is omitted.

  The protective wall 16 of the retaining body 6 a is preferably provided by selecting a position effective for preventing the retaining mechanism 7 from being released according to the configuration of the retaining mechanism 7. Further, the protective wall 16 can be provided on the side edge on the side where the notch 8 of the retaining body 6 is opened as long as it does not interfere with the coupling pin 4.

  In the retainer according to the present invention, the anti-slip mechanism may be provided on the side opposite to the side where the notch 8 of the retainer main body 6 opens, as in the retainer 1 of FIG. Like the retaining tool 1b shown in FIG. 4, the retaining body 6 may be provided on a side different from the opening direction of the notch 8 of the retaining body 6. Alternatively, a plurality of detachment prevention mechanisms 7 may be provided at different positions on the retaining body 6 so that a plurality of annular bodies 9 surround the coupling pins 4 in an overlapping manner.

  In the retainer according to the present invention, the come-off prevention mechanism may be any mechanism that can prevent the coupling pin from passing through the opening of the notch of the retainer main body. For example, as in the retainer 1c shown in FIG. Further, the detachment prevention mechanism 7c may have a rod-like member 17 that is detachably engaged on both sides of the opening of the notch 8 of the retaining main body 6c. Examples of the engagement method of the rod-shaped member 17 include snap engagement using a spring, engagement using a screw, and fastening using a clamp.

  Further, in order to ensure that the rod-shaped member 17 is prevented from being detached from the coupling pin of the retaining body 6c, the rod-shaped member 17 is engaged with the retaining body 6c in a direction different from the opening direction of the notch 8. It is also possible to provide a restricting structure such as a stopper that prevents the notch 8 of the rod-shaped member 17 from moving in the opening direction on the retaining body 6c.

  In the retainer according to the present invention, the retainer main body has a plate-like thickness that can be fitted into the engagement groove 5 of the coupling pin 4 in the vicinity of the inner edge of the notch and is flat on both sides. Well, the form of other parts is not particularly limited.

  In the coupling structure according to the present invention, for example, as shown in FIG. 9, the first member 2 a abuts against the side edge of the retainer 1 and prevents the retainer body 6 from rotating around the coupling pin 4. The anti-rotation part 18 may be provided. By having such a detent portion 18, the retainer 1 is held at a fixed angle with respect to the first member 2, and the retainer 1 is easily removed without interfering with other components. Can do.

  In addition, the rotation prevention part 18 may contact | abut to side edges other than the side edge of the side which the notch 8 of the retaining body 6 opens, and may prevent rotation of the retaining body 6. The anti-rotation portion 18 is arranged so as to have a slight play between the anti-detachment body 6 and the attachment of the anti-detachment tool 1 to the coupling pin 4 can be prevented.

  As shown in FIG. 10, the coupling structure according to the present invention has a retaining pin according to the present invention (see FIG. 1 in FIG. 10) on the coupling pin 4a in which the engagement groove 5a is formed leaving a part of the outer periphery. It is also possible to employ a structure in which the retainer 1 shown in FIG. As described above, the angular range in which the retaining body 6 can be rotated is limited because the engagement groove 5a is not present in a part of the circumferential direction of the coupling pin 4a, but a narrow angular range around the axis of the coupling pin 4a. In the case where there are other constituent elements that only become obstacles, the retaining tool 1 can be attached and detached without any problems by avoiding obstacles by turning the retaining body 6 within the range of the engaging groove 5a. .

  Further, as shown in FIG. 11, the coupling structure according to the present invention has a retaining body having a notch 8d that engages with a pair of engaging grooves 5b formed on the outer periphery of the coupling pin 4b so as to face each other in the radial direction. A structure for engaging the retainer 1d with 6d may be used. The retainer 1d is an embodiment of the present invention. The retainer main body 6d of the retainer 1d is a combination in which the straight side edges of the inner edge of the notch 8d are fitted into the pair of engagement grooves 5b, and the inner portion of the notch 8d does not have the notch 8d. It contacts the outer peripheral surface of the pin 4b. Also in the coupling structure of this embodiment, the retainer 1d can be attached and detached by rotating the retainer body 6d within the range of the engagement groove 5b.

  The retaining tool and the coupling structure according to the present invention can be particularly suitably used for coupling heavy objects such as an assembly structure of a working device of a construction machine.

1, 1a, 1b, 1c, 1d Retaining tool 2, 2a First member 3 Second member 4, 4a, 4b Connecting pin 5, 5a, 5b Engaging groove 6, 6a, 6c, 6d Retaining main body 7, 7c Detachment mechanism 8, 8d Notch 9 Annular body 10 Holding block 11 Plate-like part 12 Bonding hole 13 Plate-like part 14 Bonding hole 15 Head 16 Protective wall 17 Bar-shaped member 18 Non-rotating part

Claims (7)

A retainer for preventing a connecting pin that connects a plurality of members from falling off,
A retaining body having a notch that is open in one direction and whose inner edge fits into an engagement groove formed in the circumferential direction on the outer periphery of the coupling pin;
A slip-off preventing tool, comprising: a slip-off preventing mechanism that is disposed on the retaining body and prevents the notch from being detached from the coupling pin.   The retaining tool according to claim 1, wherein a side edge of the retaining body on the side where the notch is opened protrudes outward from the detachment preventing mechanism.   The retainer according to claim 1 or 2, wherein the locking mechanism has an annular body arranged to surround the coupling pin.   The retainer according to claim 3, wherein the annular body is formed of a linear spring material, and both end portions are held parallel to and spaced from each other. A retaining tool according to any one of claims 1 to 4,
A coupling pin having an engagement groove into which the notch of the retainer is fitted;
A coupling structure comprising: a first member and a second member coupled by the coupling pin.   The coupling structure according to claim 5, wherein the first member has a detent portion that abuts against a side edge of the retaining body and prevents the retaining body from rotating around the coupling pin.   The coupling structure according to any one of claims 1 to 6, wherein the engagement groove is formed over the entire circumference of the coupling pin.

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