JP4083163B2 - Eyebolt - Google Patents

Description

  The present invention provides an annular ring body integrally formed with a mounting base for a mounting object and a locking ring for a suspension device, from the inside to the outside in the radial direction of the ring, The present invention relates to an eye bolt in which a through-hole that can be locked by inserting a front end side of a bolt that can be screwed into an attachment object is provided in the base portion.

  The eyebolt is fixed to an attachment object and is used as a hanging tool such as a hoist pulley or a string pulley for hanging the attachment object.

  As shown in FIG. 9 (A), the conventional eyebolt includes an anchor bolt 1 that can be screwed into an object to be attached, and a through hole 2 that can be locked by inserting the tip end side of the anchor bolt 1. What is comprised from the cyclic | annular ring main body 5 which integrally formed the base 3 for attachment and the ring part 4 for latching with respect to a suspension apparatus is known (for example, refer patent document 1).

  The anchor bolt 1 is composed of a male screw portion and a head portion having a hexagonal hole, and the head portion further includes a cylinder portion 6 having a diameter larger than that of the male screw portion, and a locking edge portion 7 of the through hole 2. It is comprised from the annular flange part 8 which carries out contact locking.

  As shown in FIG. 9 (a), the diameter D of the through-hole is slanted when the anchor bolt 1 is fitted into the annular ring body 5 without being aligned with the center axis 9 of the anchor bolt and the center axis 10 of the through-hole. It is formed in such a size that it can be inserted from the direction.

  After the insertion, as shown in FIG. 9 (b), the tip portion 11 of the cylinder portion is configured to slightly protrude outward from the through hole 2, and when it is screwed and fixed to the attachment object 12, A gap is generated between the ring main body 5 and the attachment object 12, and the annular ring main body 5 is allowed to idle around the axis 9 of the anchor bolt.

JP 7-217630 A

  However, the anchor bolt 1 described above is a so-called custom-made product that has different characteristics from the generally commercially available bolts of the cylinder portion 6 and the annular flange portion 8 at the head. Therefore, the above-described anchor bolt 1 is more expensive than a commercially available bolt. For example, when the bolt is damaged due to use and needs to be replaced, it costs more than when replacing it with a general bolt. There is a problem. Also, if you want to use longer (or shorter) bolts or stronger anchor bolts, commercial bolts cannot be used as alternatives. Bolts had to be purchased or manufactured and processed, resulting in problems such as cost and labor and inconvenience in handling.

  The present invention has been made in view of the above circumstances, and can be applied to and generally handled bolts that are generally commercially available and widely used, and can reduce costs even when replacing bolts that are damaged or used. In addition, the eyebolt that provides the same function as the conventional one is provided.

A first characteristic configuration of the present invention is provided with an annular ring body integrally formed with an attachment base for an attachment object and a locking ring for an suspending device, and the ring portion is radially outward from the inside thereof. Toward the mounting object, an eyebolt provided in the base with a through-hole that can be locked by inserting the tip of a bolt that can be screwed into the mounting object, and the through-hole and the bolt are The front end of the bolt is inserted from an oblique direction with respect to the central axis of the through hole, and the bolt is in contact with the edge of the inlet portion and the outlet portion of the through hole. In this state, the distance L1 between the center axis of the bolt and the locking ring portion located on the center axis of the through hole and the radius L2 of the bolt head satisfy L1 ≧ L2. and freely fitted in the through hole The collar is provided with a collar that can be fitted externally, and a collar distal end insertion hole portion into which the distal end portion of the collar fitted onto the bolt can be inserted is formed in the through-hole, and a flange having a diameter larger than that of the distal end portion of the collar And a locking edge portion that contacts and locks the flange portion is formed on the base portion.

[Action and effect]
Since an annular ring body formed integrally with a mounting base for an object to be attached and a locking ring for a suspension device is provided, the locking ring is compared to the case where it is formed separately. It becomes the structure which comes closer to the attachment object. As a result, it can become stronger against the shearing stress applied to the eyebolt during use, and deformation of the eyebolt can be prevented, resulting in a longer service life and cost reduction.

  Further, since the front end side of the bolt that can be screwed into the mounting object is inserted in the radial direction of the locking ring portion from the inside to the outside, a locking through hole is provided in the mounting base. The eyebolt can be easily assembled simply by inserting the bolt into the through hole. In addition, since the annular ring body and the bolt can be detached and separated, maintenance is easy, and organizing and storing can be facilitated when storing them.

  In addition, since the through hole and the bolt can be inserted without matching the central axes of each other, the diameter of the through hole is larger than the diameter of the bolt, and the bolt can be easily inserted. By inserting from a direction oblique to the center, it is possible to insert a bolt having a bolt length larger than the diameter of the opening of the locking ring.

  Further, a collar that can be fitted in the through hole and that can be fitted on the bolt is provided, and a flange portion having a diameter larger than that of the collar tip portion is formed on the base end side of the collar, and in the through hole of the mounting base portion. Is provided with a collar tip insertion hole portion through which the tip portion of the collar fitted on the bolt can be inserted, and a locking edge portion that contacts and locks the flange portion. By adopting such a configuration, although the bolt is inserted through the through-hole having a diameter larger than the diameter, the axis between the inserted bolt and the through-hole is inserted through the collar. And the bolts can be locked and fixed in the through holes. As a result, compared to the case where the collar is not used, the tightening force when screwing the bolt into the mounting object can be reliably transmitted to the annular ring body through the collar, and the annular ring body is firmly attached to the mounting object. Fixed to. Therefore, if the collar is not used, since the diameter of the through hole is larger than the diameter of the bolt, the annular ring body is not firmly fixed by the bolt, so it becomes unstable, and an extra shearing force is generated during use. Although it may happen that the eyebolt breaks and comes off, such an accident can also be prevented.

  Further, since the collar only needs to be fitted on the bolt, the assembly is easy, and the bolt (bolt having a length larger than the diameter of the opening of the locking ring) is separated from the annular ring body. Since the collar cannot be separated unless it is extracted from the through hole together with the bolt, it can also function as a mechanism for preventing the bolt and the annular ring body from being separated.

  The bolts used in the eyebolts of the present invention described above can be applied to commercially available and general-purpose bolts. Therefore, custom-made bolts of various lengths are newly purchased according to the type of use as before. It is possible to replace the bolt with a commercially available bolt even when the bolt is broken, so that it is not expensive and convenient to handle.

  According to a second characteristic configuration of the present invention, the length of the collar is set such that the tip portion protrudes outward from the through hole in a state where the flange portion of the collar is in contact with and locked to the locking edge portion. It is a set point.

[Action and effect]
By adopting such a configuration, when the eyebolt is attached and fixed to the mounting object, a gap is created between the annular ring body and the mounting object, so that the annular ring body can be rotated around the axis of the bolt. Thus, it becomes possible to easily attach the hook or the like of the suspension device from any direction around the bolt axis, and the working efficiency is improved. In addition, since the tip of the collar is in contact with the mounting object, the shearing force applied to the male thread of the bolt can be greatly reduced during use, making it difficult to break and extending the service life. This is also advantageous in terms of cost.

  A third characteristic configuration of the present invention is that a locking mechanism for preventing relative rotation between the bolt and the annular ring body is provided on the mounting base.

[Action and effect]
Using a lock mechanism that prevents relative rotation between the bolt and the annular ring body, and rotating the annular ring body around the bolt axis, the rotational force is transmitted to the male thread of the bolt, so use a spanner or hexagon wrench. Even without this, it is possible to easily fix the screw to the object to be attached, or to remove the object from the object to be attached, thereby improving the work efficiency.

  According to a fourth characteristic configuration of the present invention, the lock mechanism includes a pin member and an insertion hole into which the pin member can be inserted, the bolt is a hexagon bolt, and the insertion hole is the hexagon bolt head. The pin member is fitted and fixed so as to occupy at least a part of the rotation locus.

[Action and effect]
Since the locking mechanism is composed of a pin member and a hole that allows the pin member to be freely inserted, it is not particularly complicated. Prepare an appropriate pin, and then perform simple processing such as drilling the annular ring body. Since it can be prepared just by applying, it does not take time, labor, and cost. In addition, the pin member can be inserted freely, and can be easily switched between the locked state and the released state as needed. For example, the eyebolt is attached in the locked state, and the ring is unlocked when in use. It is possible to quickly perform the operation of making the main body idle and then locking it again and removing it after use, thereby improving work efficiency.

  According to a fifth characteristic configuration of the present invention, a collar retaining mechanism for preventing the collar from coming off from the through hole is provided on at least one of the mounting base of the annular ring body and the collar. is there.

[Action and effect]
In the present invention, when the length of the bolt used is larger than the diameter of the opening of the locking ring, the bolt cannot be removed unless the collar is removed from the through hole. Therefore, as long as the collar is prevented from coming out of the through hole, for example, when an eyebolt assembled with a bolt, a collar and a ring-shaped main body is transported, the bolt is not easily detached even if some vibration is applied. So it can be used immediately. In addition, since it is difficult to remove the bolt, a deterrent acts even if the bolt is replaced with a bolt having a predetermined strength or less without the user's knowledge, and it is possible to guarantee the strength of the entire eyebolt.

  According to a sixth characteristic configuration of the present invention, the collar retaining mechanism includes a retaining C-ring and an annular groove portion into which the retaining C-ring can be fitted, and the annular groove portion is formed in the radial direction of the through hole. The collar is provided above the position of the base end surface of the collar in a state where the collar flange portion is in contact with and locked to the locking edge, and the groove depth of the annular groove portion is further increased. This is because it is formed shallower than the thickness of the retaining C ring in the radial direction.

[Action and effect]
Since the collar retaining mechanism is composed of a retaining C-ring and an annular groove portion into which the retaining C-ring can be freely inserted, a commercially available suitable C-ring is prepared without any complexity. Since it is possible to prepare by performing simple processing for forming an annular groove in the through hole of the annular ring body, it does not take time, labor and cost. Moreover, since the C-ring is used, its attachment and removal are easy. Further, the retaining C-ring is provided above the position of the base end surface of the collar in a state where the flange portion of the collar is contacted and locked to the locking edge, and further, the groove of the annular groove portion is provided. Since the depth is formed shallower than the radial thickness of the retaining C ring, a part of the inner side of the C ring protrudes above the collar, and the collar fitted in the through hole can be prevented from coming off.

  According to a seventh feature of the present invention, the collar retaining mechanism is press-fitted from the front end side of the collar to the outer periphery of the collar front end portion in a state where the flange portion of the collar is abutted and locked to the locking edge portion. It is composed of a retaining ring that can be mounted and an annular storage portion that can store the retaining ring, and the annular storage portion is provided on the radially inner peripheral surface of the end portion of the through hole. is there.

[Action and effect]
Since the collar retaining mechanism is composed of a retaining ring and an annular storage portion that can store the retaining ring, the collar retaining mechanism is not particularly complicated. For example, a metal ring or a commercially available suitable rubber band is used. You may prepare an elastic retaining ring like this, and then simply apply a simple process to form an annular storage part to store the retaining ring at the tip of the through hole of the annular ring body. Because it is possible to prepare, it does not take time, effort and cost. In addition, when the collar flange is pressed against the locking edge, the collar that is press-fitted to the outer periphery of the end of the collar is caught in the annular housing even if you try to remove it. Therefore, it can be prevented from coming off from the through hole.

  An eighth characteristic configuration of the present invention is that a bolt retaining mechanism for preventing the bolt from coming off from the collar is provided in at least one of the collar and the bolt.

[Action and effect]
In the present invention, when the length of the bolt used is shorter than the diameter of the opening of the locking ring, the bolt may come off even if the collar is prevented from coming out of the through hole. . Therefore, by further providing a mechanism for preventing the bolt from coming off from the collar, it is possible to prevent the short bolt as described above from coming off.

  According to a ninth feature of the present invention, the bolt retaining mechanism contacts and locks the flange portion of the collar to the locking edge portion, and contacts the head portion of the bolt to the base end surface of the collar. In a stopped state, an insertion hole is provided in the collar and the mounting base from the outer side surface of the mounting base to the bolt, and the entire bolt retaining member is inserted into the collar via the insertion hole. The bolt is prevented from coming off from the collar by screwing into the insertion hole and press-contacting the bolt and the bolt retaining member.

[Action and effect]
Since the bolt retaining mechanism is composed of a bolt retaining member and an insertion hole through which the bolt retaining member can be press-fitted, it is not particularly complicated, for example, a small steel ball is prepared, and the annular ring body Since it can be prepared by simply performing a simple process such as drilling on the collar, it does not take time, labor and cost. Further, since the screwed bolt retaining member remains inside the collar insertion hole while being pressed against the side surface of the bolt, the bolt can be prevented from coming off from the collar by the frictional force between the bolt retaining member and the bolt.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment
FIGS. 1A and 1B are diagrams showing the configuration of the eyebolt of the present invention and how to assemble it. The eyebolt of the present invention includes an annular ring body 5 in which a mounting base 3 and a locking ring 4 are integrally formed, an anchor bolt 13 that can be screwed onto an object to be mounted, and a collar that can be fitted onto the anchor bolt 13. 16. The collar 16 is provided with a flange portion 17 having a diameter larger than that of the tip portion on the base end side, and the anchor bolt 13 is generally commercially available and widely used. And a head 15.

  FIG. 2 is a longitudinal sectional view of the front surface (A) and the side surface (B) showing the state when the eyebolt of the present invention is screwed and fixed to the attachment object 12.

  The mounting base portion 3 is provided with a through hole 2, and a locking edge portion 7 is provided in the through hole 2 so as to contact and lock the flange portion 17 of the collar 16. The collar 16 is configured to be fitted into the through hole 2 by the locking edge 7. Furthermore, the front end portion 18 of the collar 16 is configured to protrude slightly outward from the through hole 2 in a state where the flange portion 17 is abutted and locked to the locking edge portion 7. That is, the height H1 of the collar tip insertion hole 19 provided in the through hole 2 is slightly lower than the height H2 of the collar tip 18. As a result, when the eyebolt of the present invention is fixed to the attachment object, a gap is generated between the annular ring body 5 and the attachment object 12, and the annular ring body 5 can be swung around the axis of the anchor bolt 13. Become.

  As shown in FIGS. 1 and 2, in this embodiment, the collar 16 and the bolt head 15 are configured to be fitted into the through hole 2, so that the locking ring is compared with the case where the collar 16 and the bolt head 15 are not fitted. The opening 20 of the section 4 is widened, and a hook 33 such as a hoist pulley or a string pulley is more easily hooked, and the bolt head is closer to the object 12 to be attached, so that the shear load applied to the anchor bolt 13 is reduced. It becomes possible to reduce more.

  FIG. 3 is a longitudinal cross-sectional view sequentially showing the manner in which the eyebolt of the present invention is screwed and fixed to the attachment object 12.

  First, as shown in FIG. 3A, the collar 16 is externally fitted to the anchor bolt 13, and the tip of the bolt is inserted from the oblique direction with respect to the central axis 10 of the through hole 2. At this time, the anchor bolt 13 is located on the axis of the anchor bolt 13 and the axis of the through hole 2 in a state where the anchor bolt 13 is in contact with the edges of the inlet portion and the outlet portion of the through hole 2 (referred to as S1 and S2 respectively). If the anchor bolt 13 is such that the distance L1 to the stop ring portion 4 and the radius L2 of the 13 anchor bolts satisfy L1 ≧ L2, the anchor bolt 13 can be inserted regardless of its length. When the length of the anchor bolt 13 is smaller than the diameter D ′ of the opening of the locking ring portion 4, it is not always necessary to insert the anchor bolt 13 from an oblique direction, and the central shaft 10 of the through hole 2 and the anchor bolt are not necessarily inserted. It can be inserted from directly above the through hole 2 together with the 13 central axes 9.

  Next, as shown in FIG. 3 (b), the head of the anchor bolt 13 is put into the opening 20 of the locking ring portion 4, and the center axis 10 of the through hole 2 and the center axis 9 of the anchor bolt 13 are The collar 16 is abutted and locked to the locking edge 7. Next, the head 15 of the anchor bolt is rotated using a hexagon wrench (the head 15 of the anchor bolt 13 used in the present embodiment is provided with a hexagon hole for fitting the hexagon wrench in advance) The male screw portion 14 is screwed into a female screw portion 21 provided on the attachment target object 12 and fixed to the attachment target object 12 as shown in FIG. At this time, as described above, since the tip end portion of the collar 16 is configured to protrude slightly outward from the through hole 2, the annular ring body 5 can be swung around the axis of the anchor bolt 13. It has become.

[Another embodiment]
4-8 illustrate another embodiment of the present invention.
In another embodiment shown in FIG. 4, a lock mechanism that prevents relative rotation between the anchor bolt 13 having a hexagonal head and the annular ring body 5 is provided. The lock mechanism includes a pin member 22 and its pin member. 22 is configured with a fitting hole 23 into which the fitting can be freely inserted.

  FIG. 4 is a transverse sectional view (A) and a longitudinal sectional view (B) of an eyebolt according to the present invention in another embodiment described above.

  As shown in FIGS. 4 (a) and 4 (b), the pin member 22 is connected to the annular ring body 5 so that it can be used easily (only such a configuration is more convenient. In particular, it does not have to be a structure that is always connected). Further, as shown in FIG. 4 (a), the insertion hole 23 communicates with the rotation trajectory (indicated by a dotted line) of the hexagon bolt head, and when the pin member 22 is inserted into the insertion hole 23, the pin member 22 rotates. (It is described so that one side of a hexagon bolt head and the pin member 22 may contact) in FIG. 4 (a). Therefore, when the annular ring body 5 is rotated around the axis of the anchor bolt 13 with the pin member 22 inserted, the relative rotation between the anchor bolt 13 and the annular ring body 5 is prevented, and the rotational force is the anchor bolt. Since it is transmitted to the 13 male screw portions 14, it can be screwed into the attachment object and removed from the attachment object without using a spanner or hexagon wrench. After the eyebolt is attached, the annular ring body 5 becomes free to rotate around the axis of the anchor bolt 13 by removing the pin member 22. In addition, the insertion hole 23 is not restricted to what is shown by FIG. 4, For example, it is good also as a structure provided in the center axis direction of the anchor bolt.

  In another embodiment shown in FIGS. 5 to 7, a collar retaining mechanism for preventing the collar 16 from coming off from the through hole 2 is provided. 5 and 6 includes a C-ring 24 and an annular groove 25 into which the C-ring 24 can be fitted, and the collar retaining mechanism in FIG. A retaining ring 26 (such as a rubber band) that can be press-fitted and fitted into the ring, and an annular storage portion 27 that can store the retaining ring 26.

  FIG. 5 is a cross-sectional view (A) and a vertical cross-sectional view (B) of the eyebolt of the present invention that are particularly effective when applied to a bolt having a bolt length B larger than the diameter D ′ of the opening. FIG. 6 is a cross-sectional view (A) and a longitudinal cross-sectional view (B) of the eyebolt of the present invention, which is particularly effective when applied to a bolt whose bolt length B is smaller than the diameter D ′ of the opening. is there.

  As shown in FIG. 5 (b), the annular groove portion 25 is a collar in a state where the flange portion 17 of the collar 16 is contacted and locked to the locking edge portion 7 on the radial inner peripheral surface of the through hole 2. The groove depth of the annular groove portion 25 is formed shallower than the radial thickness of the retaining C ring 24. Therefore, even if the eyebolt shown in FIG. 5B is inverted, the collar 16 does not come out of the through hole 2 and therefore the anchor bolt 13 does not come out. However, as shown in FIG. 6B, the anchor bolt 13 having a bolt length B smaller than the diameter D ′ of the opening may be pulled out. It should be thicker to prevent the anchor bolt 13 itself from coming off. The retaining C ring 24 is provided slightly above the head 15 so as not to contact the head 15 of the anchor bolt 13, and as a result, the annular ring body 5 is arranged around the axis of the anchor bolt 13. It has a configuration that does not hinder the idle rotation.

FIG. 7 is a longitudinal sectional view of the eyebolt of the present invention in the above-described another embodiment.
The retaining ring 26 is made of a material such as a metal ring or elastic rubber, and the inner diameter thereof is the same as or slightly smaller than the outer diameter of the collar tip 18.

  The annular storage portion 27 is provided in a ring shape on the radially inner peripheral surface of the end portion of the through hole 2, and constitutes an edge portion 28 to which the retaining ring 26 is locked. d1 is slightly larger than the outer diameter d2 of the retaining ring 26 in a state in which the retaining ring 26 is press-fitted to the collar tip portion 18. Further, the distance h1 between the flange portion 17 of the collar 16 and the retaining ring 26 is slightly larger than the width h2 of the edge portion 28 in a state where the retaining ring 26 is flush with the collar tip portion 18. ing. Therefore, since the annular ring body 5 and the retaining ring 26 are not in close contact with each other, the annular ring body 5 is configured not to prevent the annular ring body 5 from rotating freely around the axis of the anchor bolt 13.

  In another embodiment shown in FIG. 8, a bolt retaining mechanism for preventing the anchor bolt 13 from coming off from the collar 16 is provided. The bolt retaining mechanism includes a bolt retaining member 30 and an insertion hole 31 through which the anchor bolt 13 is inserted from the outer side surface of the mounting base 3. 8 (a) and 8 (b) are longitudinal sectional views of the eyebolt of the present invention in this different embodiment.

  As shown in FIG. 8 (a), the insertion hole 31 is provided over the collar 16 and the mounting base 3, and when the flange portion 17 of the collar 16 is abutted and locked to the locking edge portion 7, The bolt 13 is inserted. In particular, the insertion hole provided in the mounting base 3 is provided with a female screw.

  The bolt retaining member 30 is preferably formed of a small steel ball 30a. Then, as shown in FIG. 8A, a circumferential groove 32 with which the steel ball 30 a contacts is provided on the side surface of the anchor bolt 13. When the steel ball 30 a is inserted until it contacts the anchor bolt 13, the steel ball 30 a exists over the collar 16 and the circumferential groove 32. At this time, relative rotation between the anchor bolt 13 and the collar 16 is possible. Next, the lid member 34 provided with a male screw is screwed together to close the insertion hole 31 provided in the mounting base 3 so that the steel ball 30 a always exists over the collar 16 and the circumferential groove 32. At this time, the steel ball 30a inserted into the insertion hole 31 of the collar 16 does not protrude from the outer side surface of the collar 16, and the tip of the lid member 34 does not protrude into the through hole 2. is there. Therefore, the collar 16 and the annular ring body 5 can be rotated relative to each other, and the annular ring body 5 is configured not to prevent the annular ring body 5 from rotating freely around the axis of the anchor bolt 13.

  Further, as shown in FIG. 8B, the insertion hole 31 is provided over the collar 16 and the mounting base 3, and when the flange portion 17 of the collar 16 is contacted and locked to the locking edge portion 7. The anchor bolt 13 is inserted. In particular, a female screw is provided in the insertion hole provided in the collar 16.

  The bolt retaining member 30 is preferably constituted by a small screw 30b provided with a male screw. Then, as shown in FIG. 8 (b), a circumferential groove 32 with which the screw 30 b contacts is provided on the side surface of the anchor bolt 13. The screw 30b is screwed so that at least the tip of the screw 30b is in the circumferential groove 32, so that the screw 30b exists across the collar 16 and the circumferential groove 32. Further, when the screw 30b is screwed in as described above, the anchor bolt 13 and the collar 16 can be rotated relative to each other. Note that the base end portion of the screw 30 b screwed into the insertion hole 31 of the collar 16 does not protrude from the outer side surface of the collar 16. Accordingly, since the screw 30b and the inner peripheral surface of the through hole 2 do not contact each other, the collar 16 and the annular ring body 5 can be rotated relative to each other, and the annular ring body 5 can be swung around the axis of the anchor bolt 13. It is the composition which does not become the obstacle.

In addition, as the anchor bolt 13 used in the embodiment of the present invention and another embodiment, a bolt having a polygonal head (for example, a hexagonal head) or a bolt having a polygonal hole (for example, a hexagonal hole) is appropriately used. be able to.
[Other Embodiments]
1. Different embodiments of the present invention may be provided separately, respectively, or may be provided in a combination of a plurality of other embodiments as required.

The perspective view which showed the structure of the eyebolt of this invention, and the assembly method Front (b) and side (b) longitudinal sectional views showing a state when the eyebolt of the present invention is screwed and fixed to an attachment object The longitudinal cross-sectional view which showed the mode at the time of screwing and fixing the eyebolt of this invention to an attachment target object in order Cross-sectional view (b) and vertical cross-sectional view (b) of an eyebolt according to another embodiment of the present invention Cross-sectional view (b) and vertical cross-sectional view (b) of an eyebolt according to another embodiment of the present invention Cross-sectional view (b) and vertical cross-sectional view (b) of an eyebolt according to another embodiment of the present invention The longitudinal cross-sectional view of the eyebolt in another embodiment of this invention The longitudinal cross-sectional view of the eyebolt in another embodiment of this invention Side view (a) and front (b) longitudinal sectional view showing a conventional eyebolt structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conventional anchor bolt 2 Through-hole 3 Mounting base 4 Locking ring part 5 Annular ring main body 6 Cylinder part 7 Locking edge part 8 Annular flange part 9 Anchor bolt central axis 10 Through-hole central axis 12 Attachment object 13 Commercially available anchor bolt 14 Male thread part 15 Head 16 Collar 17 Flange part 18 Collar tip part 19 Collar tip insertion hole part 20 Opening part 21 Female thread part 22 Pin member 23 Insertion hole 24 Retaining stop C ring 25 Annular groove part 26 Disengagement Stop ring 27 Annular storage portion 28 Edge 30 of the annular storage portion Bolt retaining member 31 Insertion hole 32 Circumferential groove 33 Hook 34 Lid member

Claims (9)

An annular ring body formed integrally with a mounting base for the mounting target and a locking ring for the suspension device is provided, and the mounting target is directed from the inside to the outside in the radial direction of the ring. An eyebolt provided in the base with a through-hole that can be locked by inserting the front end side of a bolt that can be screwed,
The through hole and the bolt can be inserted without matching the central axes of each other,
The front end of the bolt is inserted from an oblique direction with respect to the central axis of the through hole, and the central axis of the bolt and the through hole are in a state where the bolt is in contact with the edge of the inlet portion and the outlet portion of the through hole. The distance L1 to the locking ring portion located on the central axis of the bolt and the bolt head radius L2 are set so as to satisfy L1 ≧ L2.
A collar that can be fitted into the through hole and that can be fitted to the bolt is provided, and a collar tip insertion hole portion into which the tip portion of the collar fitted on the bolt can be inserted is formed in the through hole. An eyebolt in which a flange portion having a diameter larger than the distal end portion of the collar is formed on the base end side of the collar, and a locking edge portion that contacts and locks the flange portion is provided on the base portion.   The length of the collar is set so that the tip portion protrudes outward from the through hole in a state where the flange portion of the collar is abutted and locked to the locking edge portion. Eyebolts listed.   The eyebolt according to claim 1 or 2, wherein a locking mechanism that prevents relative rotation between the bolt and the annular ring body is provided on the mounting base.   The lock mechanism is composed of a pin member and an insertion hole into which the pin member can be freely inserted. The eyebolt according to claim 3, wherein the pin member is fitted and fixed so as to occupy at least a part of the rotation locus.   The collar retaining mechanism for preventing the collar from coming off from the through hole is provided on at least one of the mounting base of the annular ring body or the collar. Eyebolts listed.   The collar retaining mechanism includes a retaining C ring and an annular groove portion into which the retaining C ring can be fitted. The annular groove portion is a radially inner peripheral surface of the through hole and the collar. The flange portion is provided above the position of the base end surface of the collar in a state where the flange portion is abutted and locked to the locking edge portion, and the depth of the annular groove portion is the depth of the retaining C ring. The eyebolt according to claim 5, wherein the eyebolt is shallower than the radial thickness.   A retaining ring that can be press-fitted to the outer periphery of the collar front end portion from the front end side of the collar with the collar retaining mechanism in contact with and locking the flange portion of the collar to the retaining edge portion, and a retaining ring thereof. The eyebolt according to claim 5, comprising an annular storage portion capable of storing a retaining ring, wherein the annular storage portion is provided on a radially inner peripheral surface of an end portion of the through hole.   The eyebolt according to any one of claims 5 to 7, wherein a bolt retaining mechanism for preventing the bolt from coming off from the collar is provided in at least one of the collar and the bolt.   In the state where the bolt retaining mechanism abuts and locks the flange portion of the collar to the locking edge and the head of the bolt contacts and locks to the base end surface of the collar, the mounting base portion The collar and the mounting base are provided with an insertion hole through which the bolt is inserted from the outer side surface of the bolt, and the entire bolt retaining member is screwed into the collar insertion hole through the insertion hole. The eyebolt according to claim 8, wherein the bolt is prevented from coming off from the collar by press-contacting the bolt and the bolt retaining member.

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