JP2019132339A - Falling prevention pin - Google Patents

Abstract

To provide a falling prevention pin capable of surely grabbing a head part with fingers, and capable of being extracted/inserted from/into a pin hole of a shaft member.SOLUTION: A falling prevention 11 has: a linear insertion part 13 formed by integrally bending a metal wire having a spring property, and inserted into a pin hole; a corrugated part 14 elastically engaged with an outer peripheral part of a shaft member; and a folded part 15 connecting the insertion part and the corrugated part. The folded part has: a linear gripping part 15a hooked by fingers when the falling prevention pin is inserted/removed into/from the pin hole; a first bent part 15b connecting one end of the gripping part and the insertion part at a right angle; and a second bent part 15c connecting the other end of the gripping part and the corrugated part in a direction which the corrugated part adjoins to the insertion part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retaining pin, and more particularly to a retaining pin that is attached to a pin hole of a shaft member of a work machine or the like to prevent the shaft member from slipping.

  As a means to stop the shaft member from coming out of the shaft insertion hole in a state where the shaft member having the circular cross section and the connecting member having the shaft insertion hole are detachably fitted, it is inserted into and removed from the pin hole provided in the shaft member. There are retaining pins that can be attached. As one of the retaining pins, there is a known beta pin (see, for example, Patent Document 1).

  The beta pin is formed by bending a springy metal wire into an approximately β shape. When mounting, the β-shaped ring-shaped head is pinched with the fingertip, and the straight portion is inserted into the pin hole of the shaft member from the tip side. To do. At this time, the β-shaped undulating portion is pushed and expanded by the outer peripheral portion of the shaft member, and the beta pin is held on the shaft member by the elastic force of the undulating portion. On the other hand, in order to remove the beta pin from the pin hole, a tool such as a fingertip or radio pliers is hooked on the head and pulled out.

Japanese Patent Laying-Open No. 2003-95580 (FIG. 8)

  As mentioned above, the beta pin has the advantage of being able to easily prevent the shaft member from falling off, so it is also used for disassembling and assembling large parts such as leaders and gantry during transportation, such as large pile drivers. In this case, a shaft member having a large diameter, for example, a diameter of about 70 mm, and a thick and long retaining pin corresponding to the diameter of the shaft member are used. However, when the retaining pin becomes thick, the elastic force and the frictional force increase, and there is a problem that the insertion cannot be performed quickly.

  In addition, when inserting the retaining pin, the palm of the hand holding the head slips and cannot be inserted with the proper force.In addition, when pulling out the retaining pin, the fingertips slip and tighten each other, causing pain. It was a heavy work for the workers. In addition, the burden is further increased under bad conditions such as in rainy weather or in cold regions. In addition, the retaining pin may be in close contact with the wall portion of the connecting member, and it is not easy to pull it out against the elastic force and frictional force of the retaining pin, which is a dangerous operation.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a retaining pin that can securely grip a head with fingers and can be easily inserted into and removed from a pin hole of a shaft member.

  In order to achieve the above object, the retaining pin of the present invention is inserted into the pin hole of the shaft member in a state in which the shaft member and the connecting member having the shaft insertion hole are detachably fitted. In the retaining pin for retaining the member, the retaining pin is formed by integrally bending a springy metal wire, and includes a linear insertion portion inserted into the pin hole, and a shaft member. A corrugated portion that elastically engages with an outer peripheral portion, and a folded portion that connects the insertion portion and the corrugated portion, and the folded portion is configured to move a finger when inserting or removing the retaining pin into the pin hole. A linear gripping portion to be hung, a first bending portion that connects one end of the gripping portion and the insertion portion at a right angle, and the other end of the gripping portion and the wavy portion are close to the insertion portion. It has the 2nd bending part connected in direction, It is characterized by the above-mentioned.

  Moreover, the length of the said holding part is 50-100 mm, It is characterized by the above-mentioned. Furthermore, the diameter of the metal wire is 5 mm to 10 mm.

  In addition, the corrugated portion includes an arcuate engaging portion that engages with the outer peripheral portion of the shaft member, and an expanded portion that extends to the distal end of the engaging portion and is inclined in a direction away from the insertion portion. And a linear support portion connecting the base end of the engaging portion and the second bent portion.

  According to the present invention, there is a linear gripping part via the first bending part on the proximal end side of the insertion part of the retaining pin, and the gripping part and the insertion part are formed at a right angle. When the retaining pin is inserted into and removed from the pin hole of the shaft member, the grip portion can be securely gripped with fingers, and in particular, the burden on the fingers can be reduced when the retaining pin is pulled out. Moreover, if it is bad conditions, such as performing in rainy weather or a cold region, a more remarkable effect will be obtained and the retaining pin can be handled safely and safely.

  Further, since the length of the linear gripping portion is 50 to 100 mm, the finger is not caught and pressed by the bent portion of the folded portion, and the gripping portion can be gripped more reliably. Furthermore, since the diameter of the metal wire is 5 mm to 10 mm, the shaft member can be prevented from coming off with sufficient elasticity and durability that can be applied to a large-diameter shaft member. Accordingly, there is no inconvenience that the thin and small beta pin applied to the small-diameter shaft member is easily deformed and cannot be reused by repeated attachment and detachment.

It is a top view which shows the example of 1 form of the retaining pin of this invention. It is an exploded perspective view of the principal part similarly.

  FIGS. 1 and 2 show an example of a retaining pin according to the present invention. The retaining pin 11 shown in this embodiment is formed by bending a spring-like metal wire integrally into a substantially β shape. The linear insertion part 13 inserted in the pin hole 12a provided in the front-end | tip part of the shaft member 12 of circular cross section, the wavy part 14 elastically engaged with the outer peripheral part of the shaft member 12, and the insertion part 13 and a folded portion 15 that connects the wave-shaped portion 14, and a pair of the first connecting member 16 and the second connecting member 17 having the shaft member 12 and the shaft insertion holes 16 a and 17 a can be inserted and removed. In such a state, the shaft member 12 is inserted into the pin hole 12a of the shaft member 12 to prevent the shaft member 12 from coming off. In this embodiment, the retaining pin 11 suitable for the shaft member 12 having a diameter of 65 mm or 70 mm is shown, and the diameter D1 of the metal wire is 9 mm, and the elastic force and durability applicable to the large-diameter shaft member 12 are shown. Desirable thickness, for example, a diameter of 5 mm to 10 mm is desirable.

  The folding portion 15 is formed by bending the linear gripping portion 15a with which a finger is put when inserting / removing the insertion portion 13 of the retaining pin 11 into / from the pin hole 12a, and one end of the gripping portion 15a and the insertion portion 13 by approximately 90 degrees. It has the 1st bending part 15b which connects at an angle, and the 2nd bending part 15c which connects the other end of the holding part 15a, and the wavy part 14 in the direction which this wavy part 14 adjoins the penetration part 13. The length L1 of the gripping part 15a is 54 mm, and it is desirable that at least three fingers, for example, the index finger, the middle finger, and the ring finger are hung, for example, 50 to 100 mm.

  The bending radius R1 of the first bending portion 15b is 11 mm. Here, the bending radius is the bending radius of the axis of the metal wire, and is a size that allows the gripping position to be fixed in a state where the fingers are shifted to the first bending portion 15b, for example, 1 to 1 of the diameter D1 of the metal wire. It is desirable that it is 1.5 times. Further, the bending radius R2 of the second bending portion 15c is formed to be 20 mm, and is a size that can ensure a predetermined elastic force, for example, 1.5 to 2 times the bending radius R1 of the first bending portion 15b. Is desirable.

  The wavy portion 14 includes an arcuate engaging portion 14a that engages with the outer peripheral portion of the shaft member 12, and an expanded portion 14b that extends in the direction away from the insertion portion 13 extending to the distal end of the engaging portion 14a. And a linear support portion 14c that connects the base end of the engaging portion 14a and the second bent portion 15c, and the widened portion 14b has a length that substantially aligns the distal end thereof with the distal end of the insertion portion 13. Is formed.

  Here, a procedure for attaching the retaining pin 11 will be described. First, the shaft member 12 is inserted into the shaft insertion holes 16a and 17a in a state where the shaft insertion holes 16a and 17a of the first connection member 16 and the bifurcated second connection member 17 are connected to each other. . The shaft member 12 includes a cylindrical body portion 12b that is inserted into the shaft insertion holes 16a and 17a, and a substantially rectangular annular handle 12c that is provided at a base end portion of the body portion 12b, and the distal end of the body portion 12b. A pin hole 12a into which the insertion portion 13 of the retaining pin 11 is inserted is provided in the radial direction.

  Subsequently, when the gripping portion 15 a of the retaining pin 11 is gripped and the distal end of the insertion portion 13 is inserted into the pin hole 12 a, the expanded portion 14 b of the waved portion 14 comes into contact with the trunk portion 12 b of the shaft member 12. From this state, when the palm is pressed against the gripping portion 15a and further pushed in, the widened portion 14b is pushed and expanded by the trunk portion 12b, and the trunk portion 12b is elastically overcome, and the engaging portion 14a of the wavy portion 14 is 12b is engaged. As a result, the retaining pin 11 is held in a stable state with the shaft member 12 sandwiched between the insertion portion 13 and the wave-like portion 14. On the other hand, in order to remove the retaining pin 11 from the pin hole 12a, the engagement of the wave-like part 14 with the body part 12b is released by hooking and pulling the fingertip on the grip part 15a, and the insertion part 13 is pulled out from the pin hole 12a. It is.

  As described above, the linear holding portion 15a is provided on the proximal end side of the insertion portion 13 of the retaining pin 11 via the first bent portion 15b, and the holding portion 15a and the insertion portion 13 are formed at a right angle. Therefore, when the retaining pin 11 is inserted into and removed from the pin hole 12a of the shaft member 12, the grip portion 15a can be securely grasped with fingers, and in particular, the burden on the fingers when pulling the retaining pin 11 is removed. Can be reduced. Moreover, if it is bad conditions, such as performing in rainy weather or a cold region, a more remarkable effect will be acquired and the retaining pin 11 can be handled safely and safely. In this case, if a cushion material such as a single-sided tape is wrapped around the gripping portion 15a, the gripping portion 15a can be gripped more reliably, and can be wound around the surface of the gripping portion 15a with a uniform thickness. Problems such as unraveling of the material can also be suppressed. In addition, even if the retaining pin 11 is in close contact with the wall portion of the second connecting member 17, the retaining pin 11 can be easily pulled out with one hand, and is pulled out by hooking a tool such as a bar. It is possible to eliminate dangerous work such as

  Further, since the diameter D1 of the metal wire is 9 mm, that is, 5 mm to 10 mm, the shaft member can be prevented from coming off with sufficient elasticity and durability that can be applied to a large-diameter shaft member. Accordingly, there is no inconvenience that the thin and small beta pin applied to the small-diameter shaft member is easily deformed and cannot be reused by repeated attachment and detachment.

  Furthermore, since the length L1 of the gripping portion 15a is 54 mm, that is, 50 mm to 100 mm, the fingers are not caught on the first bending portion 15b and the second bending portion 15c and are pressed, and the gripping portion 15a is gripped more securely. It comes out. In addition, since the bending radius R1 of the first bending portion 15b is 11 mm, that is, 1 to 1.5 times the diameter D1 (9 mm) of the metal wire, the position of the gripping portion 15a is brought closer to the axis of the insertion portion 13. In other words, the position of the force for inserting and removing the retaining pin 11 can be brought closer to the axial center of the insertion portion 13, so that the insertion portion 13 is prevented from being caught in the pin hole 12a. 11 can be easily inserted and removed.

  In addition, since the gripping position is fixed in a state where the finger gripping the gripping portion 15a is shifted to the first bending portion 15b, it is not necessary to change the retaining pin 11, and the retaining pin 11 is accidentally dropped. There is no fear. Furthermore, coupled with the reduction in the bending radius R1 of the first bending portion 15b, it is possible to form the folded portion 15 in a compact manner. Even if the periphery of the mounting position of the retaining pin 11 is narrow, the retaining portion 11 is prevented from being detached. The pin 11 can be inserted and removed without difficulty.

  In addition, the bending radius R2 of the second bending portion 15c is 20 mm, that is, 1.5 to 2 times the bending radius R1 (11 mm) of the first bending portion 15b. While securing the elastic force, the stress on the second bent portion 15c is dispersed to relax the stress concentration, thereby preventing the retaining pin 11 from being damaged. Moreover, since the wave-like part 14 has the expansion part 14b which extended to the front-end | tip of the engaging part 14a, and inclined in the direction away from the insertion part 13, the insertion part 13 front-end | tip is inserted in the pin hole 12a. In some cases, the widened portion 14b can be brought into contact with the outer peripheral surface of the body portion 12b and smoothly spread.

  Note that the present invention is not limited to the above-described embodiment, and it is only necessary to have a linear gripping portion at the folded portion of the retaining pin, and the length of the insertion portion is also a work space for inserting and removing the retaining pin. It can be extended accordingly. Moreover, you may form so that a contact with a finger may be in a surface contact state by crushing a holding part into flat form. Further, a streak-like or mesh-like anti-slip may be applied to the surface of the grip portion by rolling. In addition, in the present embodiment, a configuration is shown in which the shaft member inserted into the shaft insertion hole is prevented from being detached by a retaining pin so that the shaft member does not come out, but conversely, the connecting member having the shaft insertion hole is separated from the shaft member. The present invention can also be applied to the case where the retaining pin is used to prevent it from coming out.

  DESCRIPTION OF SYMBOLS 11 ... Retaining pin, 12 ... Shaft member, 12a ... Pin hole, 12b ... Trunk part, 12c ... Handle, 13 ... Insertion part, 14 ... Wave-like part, 14a ... Engagement part, 14b ... Expansion part, 14c ... Support 15, folded portion, 15 a, gripping portion, 15 b, first bending portion, 15 c, second bending portion, 16, first connecting member, 16 a, shaft insertion hole, 17, second connecting member, 17 a, shaft insertion Hole

Claims (4)

  In the retaining pin that is inserted into the pin hole of the shaft member and prevents the shaft member from being detached in a state in which the shaft member and the connecting member having the shaft insertion hole are detachably fitted, the retaining pin Is formed by integrally bending a spring metal wire, a linear insertion portion inserted into the pin hole, a wavy portion elastically engaged with an outer peripheral portion of the shaft member, and the insertion And a folded portion that connects the wavy portion, and the folded portion includes a linear gripping portion that hooks a finger when the retaining pin is inserted into and removed from the pin hole, one end of the gripping portion, and the A first bending portion that connects the insertion portion at a right angle; and a second bending portion that connects the other end of the gripping portion and the wavy portion in a direction in which the wavy portion approaches the insertion portion. Retaining pin that features.   The retaining pin according to claim 1, wherein a length of the grip portion is 50 to 100 mm.   The retaining pin according to claim 1 or 2, wherein the metal wire has a diameter of 5 mm to 10 mm.   The corrugated portion includes an arcuate engagement portion that engages with an outer peripheral portion of the shaft member, an expansion portion that extends to a distal end of the engagement portion and is inclined in a direction away from the insertion portion, and the engagement portion. The retaining pin according to any one of claims 1 to 3, further comprising a linear support portion that connects a base end of the joint portion and the second bent portion.

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