JP3150969U - Retaining pin - Google Patents

Abstract

An insertion hole formed in a shaft member can be easily mounted from any direction, and after mounting, there is no risk of unexpected disconnection from the shaft member due to an external force (contact with an article, etc.). In addition, to provide a retaining pin that can be easily removed, used repeatedly (reused), and can reduce manufacturing costs. A retaining pin (1) for preventing a coupling member (20) connected to an insertion hole (12) formed in a shaft member (10) and coupled to the shaft member (10) from coming off from the shaft member (10). The insertion part 2 of the rod shape inserted into the insertion hole 12 of 10, the retaining part 3 formed at one end of the insertion part 2, one end side is connected to the retaining part 3, and the other end side is connected to the other end of the insertion part 2. A coil spring member 4 having an annular locking portion 4a that is detachably locked and shorter than the insertion portion 2 is provided. [Selection] Figure 2

Description

  The present invention relates to a retaining pin, and more particularly to a retaining pin that is attached to an insertion hole formed in a shaft member and can prevent loosening and detachment of a coupling member such as a nut coupled to the shaft member.

  Conventionally, the pin shown in FIG. 4 (so-called split pin) is well known as a retaining pin (see, for example, Patent Document 1 below). The retaining pin 51 is composed of a wire made up of a substantially annular head 52 and two legs 53 and 54 extending in parallel from both ends of the head 52 and having different lengths. In the figure, reference numeral 60 denotes a shaft member in which an insertion hole 61 into which the retaining pin 51 is inserted is formed. In use, after the feet 53 and 54 of the retaining pin 51 are inserted into the insertion hole 61 (FIG. 4A), the tips of the feet 53 and 54 of the retaining pin 51 are attached to both sides with a tool such as a hammer. (FIG. 4B).

  According to the retaining pin 51, a coupling member (not shown) is attached to the insertion hole 61 in a state where the legs 53 and 54 are bent so as to contact the outer peripheral surface of the shaft member 60 and coupled to the shaft member 60. Can be prevented from loosening or coming off.

  However, since this type of retaining pin 51 needs to bend the tip portions of the foot portions 53 and 54 using a tool such as a hammer, the attaching and detaching operations become complicated, and the tips of the foot portions 53 and 54 are also complicated. Since the portion is bent and used, there is a problem that it is difficult to repeatedly use the portion.

  Therefore, in order to solve such a problem, a retaining pin that is relatively easy to mount and remove and can be used repeatedly is disclosed in, for example, Patent Documents 2 to 4 listed below.

  FIG. 5 is a view showing another conventional retaining pin. The retaining pin 71 forms an annular portion 72 formed in a substantially annular shape, an insertion portion 73 extending linearly from one end of the annular portion 72, and a substantially half-moon-shaped gap from the other end of the annular portion 72. It is comprised with the wire which consists of the curved part 74 extended in the shape to do. In use, the tip of the insertion portion 73 is inserted into the insertion hole 61 formed in the shaft member 60, while the tip of the bending portion 74 is brought into contact with the outer peripheral surface of the shaft member 60 (FIG. 5A), and is inserted as it is. Push in toward the hole 61 (arrow A direction) to fit the curved portion 74 to the outer periphery of the shaft member 60 (FIG. 5B).

  According to the retaining pin 71, the coupling member is attached to the insertion hole 61 in a state where the bending portion 74 is pressed against the outer peripheral surface of the shaft member 60 by the urging force obtained by the annular portion 72, and is coupled to the shaft member 60. It is possible to prevent loosening (not shown) and detachment.

  However, the retaining pin 71 shown in FIG. 5 is applied to the shaft member in which the insertion hole 61 is formed in the vicinity of the tip of the shaft, for example, the pin bolt of the shackle fitting used for hanging heavy objects. Even if the curved portion 74 of the retaining pin 71 is attached in pressure contact with the outer peripheral surface of the pin bolt tip, an external force (for example, an object hits the annular portion 72 and the annular portion 72 is When the annular portion 72 is changed from the horizontal direction to the vertical direction (that is, the insertion portion 73 is rotated), the pressure contact state with respect to the outer peripheral surface of the pin bolt tip of the bending portion 74 is released and the insertion portion is inserted. There was a possibility that the portion 73 could easily fall off. Therefore, there is a problem that it is not suitable for preventing a shaft member having an insertion hole near the tip of the shaft, such as a pin bolt of a shackle fitting.

  Further, since the retaining pin 71 has a hairpin shape, an urging force that presses the outer peripheral surface of the shaft member can be obtained. However, in order to increase the urging force, the annular portion 72 must have a large diameter. There was a problem that the shape was bulky and the usability was poor. Further, when an external force is applied in a direction in which the distal end of the insertion portion 73 protruding from the insertion hole 61 is pushed into the insertion hole 61 (in the direction of the broken arrow B) in a state where the shaft member is mounted (FIG. 5B). Sufficient urging force does not act on the external force in the pushing direction, the bending portion 74 is relatively easily pushed and spread, the bending portion 74 is detached from the shaft member 60, and the insertion portion 73 may fall out of the insertion hole 61. There was also.

  6A and 6B are diagrams showing still another conventional retaining pin, in which FIG. 6A is a side view and FIG. 6B is a diagram showing a use state. The retaining pin 81 includes a pin main body 84 composed of a head portion 82 and a body portion 83, and a snap ring in which both ends of the pin main body 84 are deviated from each other up and down and back and forth, and both ends are rotatably inserted. 85, and the snap ring 85 is repelled so as to abut on the vicinity of the tip of the body 83, so that the body 83 is held in a state of being inserted into the insertion hole 61A of the shaft member 60A. .

  However, since the retaining pin 81 has a large diameter of the snap ring 85, its shape is bulky and unusable, and it takes time to process the pin body 84 (punching, drilling, welding, etc.) There was a problem that the production cost was high. Further, when an external force acts in the direction in which the snap ring 85 is lifted upward, the snap ring 85 is separated from the body portion 83, and when an external force is further applied, the snap ring 85 is reversed and the body portion 83 is detached from the insertion hole 61A and falls off. There was a risk of it.

JP 2002-181023 A Japanese Utility Model Publication No. 5-86011 Japanese Patent Laid-Open No. 10-306815 Japanese Utility Model Publication No. 56-139002

Means for solving the problems and their effects

  The present invention has been made in view of the above problems, and can be easily mounted from any direction when inserted into the insertion hole formed in the shaft member. Also, after mounting, external force (contact with the article) Etc.) for the purpose of providing a retaining pin that can be easily removed from the shaft member, can be removed easily, can be used repeatedly (reused), and can be manufactured at low cost. Yes.

  In order to achieve the above object, a retaining pin (1) according to the present invention is attached to an insertion hole formed in a shaft member, and prevents a coupling member coupled to the shaft member from being detached from the shaft member. And a rod-shaped insertion portion that is inserted into the insertion hole of the shaft member, a retaining portion formed at one end of the insertion portion, and one end side connected to the retaining portion, and the other end side. And a coil spring member having a length shorter than that of the insertion portion, which is formed with an annular engagement portion that is detachably engaged with the other end of the insertion portion.

  According to the retaining pin (1), it is not a hairpin shape like the retaining pin 71 shown in FIG. 5, i.e., it is not a form in which the outer peripheral surface of the shaft member is pressed by the urging force of the annular portion 72. It can be easily mounted from any direction without considering the insertion direction of the insertion portion into the insertion hole.

  In addition, since the insertion portion is inserted through the insertion hole, the other end (tip) of the insertion portion protruding from the insertion hole is locked through the annular locking portion of the coil spring member. After the mounting, even if an external force acts in the direction in which the insertion portion rotates in the insertion hole and the insertion portion rotates, the locking portion of the coil spring member is locked to the insertion portion. There is no possibility that the insertion part is detached from the insertion hole.

  In addition, after the mounting, even when an external force is applied to push the other end (tip) portion of the insertion portion protruding from the insertion hole, the other end (tip) of the insertion portion is caused by the contraction force of the coil spring member. Since the pushing of the portion into the insertion hole is restricted, the locking portion of the coil spring member is very unlikely to come off from the other end (tip) of the insertion portion, and is unexpectedly caused by an external force (such as contact with an article). Therefore, it is possible to improve the reliability of preventing the shaft member from coming off.

  On the other hand, when removing the retaining pin (1) from the shaft member, for example, the shaft member is supported by the left hand and the retaining portion is held by the right hand, and it is only necessary to perform the operation of pulling out from the insertion hole. Can be done easily. That is, when the pulling-out operation of the retaining portion is performed, the coil spring member is extended, and then the locking portion is disengaged from the tip of the insertion portion. The insertion portion can be pulled out from the insertion hole with a force that does not burden the operator.

  Further, the removed retaining pin (1) can be repeatedly used (reused), and it is not necessary to process a member that requires time and effort such as punching, drilling, and welding, so that the manufacturing cost can be reduced. Therefore, it is possible to provide a retaining pin excellent in convenience, workability, reliability, and economy.

  The retaining pin (2) according to the present invention is the retaining pin (1), wherein the retaining portion is formed by winding one end side of the insertion portion, and the distal end portion of the retaining portion. The tip of the retaining portion is cut at a position where the angle between the direction and the insertion portion is less than 90 °.

  According to the retaining pin (2), the retaining portion is formed by winding one end side of the insertion portion, and the angle formed by the orientation of the distal end portion of the retaining portion and the insertion portion is less than 90 °. Since the tip of the retaining portion is cut at the position, it is not necessary to process the tip (the other end) of the retaining portion in an annular shape, making the processing work easier and further reducing the manufacturing cost. be able to.

  Further, in the retaining pin (3) according to the present invention, in the retaining pin (1) or (2), the locking portion inverts or offsets a part of the other end side of the coil spring member. It is characterized by being formed.

  According to the retaining pin (3), the locking portion inverts a part of the other end side of the coil spring member (turns back approximately 180 degrees) or offsets it (the mandrel of the coil spring member). Therefore, it is possible to reduce the part cost by using a part of the coil spring member, and to easily adjust the length of the coil spring member and the locking portion. Can do.

Further, the retaining pin (4) according to the present invention is the retaining pin (1) to (3), wherein the coil spring member is a tension coil spring using a stainless steel wire, and 0.6-1 It has a spring constant of 0.0 (N / mm).
The spring constant k is a proportional constant obtained by dividing the load P (N) by the elongation (displacement δ) (mm) when a load is applied to the spring, that is, k = P / δ (N / mm). The constants that can be expressed are shown.

  According to the retaining pin (4), since the coil spring member is made of a tension coil spring using a stainless steel wire, durability can be improved and 0.6 to 1.0 (N / mm). The spring constant can be easily attached and removed with a force that does not impose a burden on the operator, while being able to fully exhibit the retaining effect from the shaft member using the elastic force of the spring. it can.

  Further, the retaining pin (5) according to the present invention has a length ratio between the insertion portion and the coil spring member in any of the retaining pins (1) to (4), which is 7: 4 to 7 : It is characterized by being set so that it may become the range of 5.

  According to the retaining pin (5), the length ratio between the insertion portion and the coil spring member is set so as to be in the range of 7: 4 to 7: 5. While it can be easily attached and detached with a force that does not become a problem, the effect of preventing the shaft member from coming off using the elastic force of the spring can be sufficiently exerted.

It is the figure which showed the retaining pin which concerns on embodiment of this invention, (a) is a front view, (b) is a top view. It is a figure for demonstrating the use condition of the retaining pin which concerns on embodiment, (a) is a front view, (b) is a top view. It is the front view which showed the retaining pin which concerns on another embodiment. (A), (b) is the top view which showed the use condition of the conventional retaining pin. (A), (b) is the top view which showed the use condition of another conventional retaining pin. It is the figure which showed another conventional retaining pin, (a) is a side view, (b) is the perspective view which showed the use condition.

  Embodiments of a retaining pin according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically illustrating a retaining pin according to an embodiment, where (a) is a front view and (b) is a plan view. 2A and 2B are diagrams for explaining a usage state of the retaining pin according to the embodiment, in which FIG. 2A is a plan view and FIG. 2B is a front view.

  The retaining pin 1 shown in FIG. 1 includes an insertion portion 2 made of round steel bar, a retaining portion 3 formed by winding one end side of the inserting portion 2 once or twice, and one end side connected to the retaining portion 3. The coil spring member 4 having a shorter length than the insertion portion 2 is formed with an annular locking portion 4a that is detachably engaged with the other end of the insertion portion 2 on the other end side. Note that the length and thickness (shaft diameter) of the insertion portion 2 are appropriately set in consideration of the diameter of the shaft member to which the retaining pin 1 is attached and the diameter of the insertion hole.

  The coil spring member 4 is formed of a tension coil spring using a stainless steel wire, and preferably a member having a spring constant of 0.6 to 1.0 (N / mm) can be adopted. Moreover, these lengths are set so that the ratio (L1: L2) of the length between the insertion portion 2 and the coil spring member 4 (coil portion 4b) is in the range of 7: 4 to 7: 5.

  When the length of the coil spring member 4 is longer than 7: 5, the attachment and removal work by the operator is further facilitated. However, the spring contracts sufficiently to counter the external force that pushes the tip of the insertion portion 2 at the time of attachment. It is difficult to obtain force, which is not preferable.

  On the other hand, if the length of the coil spring member 4 is shorter than 7: 4, a sufficient spring contraction force that opposes the external force or the like that pushes the tip of the insertion portion 2 is obtained, but a burden is imposed on the installation and removal work by the operator ( A strong force is required to extend the coil spring member with a finger), which is not preferable.

  The locking portion 4a of the coil spring member 4 is formed by reversing a part (for several coils) on the other end side of the coil spring member 4 (folding back about 180 degrees). Note that the coil diameter of the coil spring member 4 is set to be larger than the shaft diameter of the insertion portion 2, and the engagement portion 4 a of the coil spring member 4 is fitted to the distal end of the insertion portion 2 to pass through the figure. As shown in FIG. 1, the locking portion 4 a is locked to the insertion portion 2.

Next, a usage pattern of the retaining pin 1 according to the embodiment will be described with reference to FIG.
In the figure, reference numeral 10 denotes a part of a pin bolt (shaft member) constituting the shackle fitting. The shackle fitting is configured to include a substantially U-shaped shackle body (not shown) and the pin bolt 10, and insertion holes for inserting the pin bolt 10 are formed at both ends of the shackle body. A substantially circular flat portion is formed.

  A head (not shown) is formed at one end of the pin bolt 10, and a screw portion 11 is formed at the other end side so that a nut 20 as a coupling member can be screwed. An insertion hole 12 into which the retaining pin 1 is inserted is formed.

  First, the operator inserts the pin bolt 10 into insertion portions at both ends of the shackle body (not shown), and then screws the nuts 20 into the screw portions 11 of the pin bolt 10 to finish the assembly of the shackle fitting.

  Next, the operator confirms that the locking portion 4a of the coil spring member 4 of the retaining pin 1 is not locked to the insertion portion 2, supports the pin bolt 10 with one hand, and pulls it with the other hand. Holding the retaining portion 3 of the retaining pin 1, the insertion portion 2 is inserted into the insertion hole 12 of the pin bolt 10, and the retaining portion 3 is pressed against the outer peripheral surface of the pin bolt 10. The orientation of the retaining portion 3 at the time of insertion may be horizontal or vertical, and the insertion direction of the insertion portion 2 with respect to the insertion hole 12 may be any orientation.

  When the insertion of the insertion portion 2 into the insertion hole 12 is completed, the operator next grasps the distal end portion of the coil spring member 4 with a finger and pulls the spring portion 4b, while leading the distal end of the insertion portion 2 protruding from the insertion hole 12. Then, when the hand is released from the coil spring member 4, the spring portion 4 b returns to its original compressed state, and the locking portion 4 a together with the spring portion 4 b is removed from the tip of the insertion portion 2 ( The difference L1-L2) moves inward, and the attaching operation of the retaining pin 1 is completed.

  In the mounted state shown in FIG. 2, for example, an external force (such as an object coming in contact with the object) that rotates the retaining portion 3 (force in the direction of arrow A in the figure) acts on the retaining portion 3 of the retaining pin 1. 3, even if the insertion portion 2 rotates (that is, even if the retaining portion 3 changes from horizontal to vertical), the locking portion 4 a of the coil spring member 4 is inserted into the insertion portion 2 by the spring contraction force of the coil spring member 4. Therefore, there is no possibility that the insertion portion 2 is easily detached from the insertion hole 12.

  In the mounted state shown in FIG. 2, for example, an external force (force in the direction of arrow B in the figure) pushes the distal end portion of the insertion portion 2 of the retaining pin 1 protruding from the insertion hole 13 of the pin bolt 10 into the insertion hole 12. ) Acts (when it hits an object), the coil spring member 4 starts to expand and at the same time, the spring contraction force acts, and the pushing of the insertion portion 2 is restricted by the contraction force. Therefore, the engaging portion 4a of the coil spring member 4 is configured not to be accidentally detached from the distal end of the insertion portion 2 due to an external force (contact with an article or the like).

  On the other hand, when the retaining pin (1) is removed from the pin bolt 10, if the pin bolt 10 is supported by one hand and the retaining portion 3 of the retaining pin 1 is held by the other hand, the operation of pulling out from the insertion hole 12 is performed. Good. When the pulling portion 3 is held and pulled out with a required force in the direction of pulling out from the insertion hole 12, the coil spring member 4 is extended, and the distance between the tip of the insertion portion 2 and the locking portion 4a is shortened according to the extension. When the tip of the insertion portion 2 reaches the inside of the locking portion 4a, the locking portion 4a is detached from the tip of the insertion portion 2, and the retaining pin 1 can be removed from the pin bolt 10.

According to the retaining pin 1 according to the above-described embodiment, it is not a hairpin shape like the retaining pin 71 shown in FIG. Therefore, it can be easily mounted from any direction without considering the insertion direction of the insertion part 2 into the insertion hole 12.
Further, after the mounting, even if an external force acts in a direction in which the insertion portion 2 rotates in the insertion hole 12 and the insertion portion 2 rotates, the annular locking portion 4 a of the coil spring member 4 is locked to the insertion portion 2. Therefore, there is no possibility that the insertion portion 2 is detached from the insertion hole 12.

  In addition, even when an external force is applied to push the distal end portion of the insertion portion 2 protruding from the insertion hole 12 after mounting, the distal end portion of the insertion portion 2 is pushed into the insertion hole 12 by the contraction force of the coil spring member 4. Therefore, it is very unlikely that the locking portion 4a of the coil spring member 4 will be disengaged from the tip of the insertion portion 2, and there is no risk that the engaging portion 4a will be unexpectedly detached from the shaft member due to external force (contact with an article, etc.). It is possible to improve the reliability of preventing the members from coming off. Further, by using the coil spring member 4 that expands and contracts, any shaft member having a shaft diameter shorter than the length of the insertion portion 2 can be applied to various shaft diameters, and one retaining pin 1 can be used. The types of shaft members that can be handled can be increased.

  On the other hand, when removing the retaining pin 1 from the pin bolt 10, the pin bolt 10 is supported by one hand, the retaining portion 3 is held by the other hand, and the force is applied to the finger so as not to burden the finger. It is only necessary to perform the removal, and the removal work can be easily performed.

  Further, the removed retaining pin 1 can be repeatedly used (reused), and it is not necessary to process a member that requires time and effort such as punching, drilling, and welding, so that the manufacturing cost can be reduced and the convenience can be reduced. In addition, it is possible to provide a retaining pin excellent in workability, reliability, and economy.

  Further, since the locking portion 4a of the retaining pin 1 is formed by reversing a part of the other end side of the coil spring member 4, the part cost can be suppressed by using a part of the coil spring member 4. Moreover, the length adjustment of the coil spring member 4 and the latching | locking part 4a etc. can be performed easily.

  Further, since the coil spring member 4 of the retaining pin 1 is made of a tension coil spring using a stainless steel wire, durability can be improved and a spring constant of 0.6 to 1.0 (N / mm) can be obtained. And the ratio of the length of the coil spring member 4 and the insertion portion 2 is set so as to be in the range of 7: 4 to 7: 5. While the removal operation can be performed, the effect of preventing the pin bolt 10 from coming off using the elastic force of the spring can be sufficiently exhibited.

  FIG. 3 is a front view schematically showing a retaining pin according to another embodiment. The difference from the retaining pin 1 according to the above embodiment lies in the structure of the retaining portion and the coil spring member. The retaining portion 3 of the retaining pin 1 described above is formed in a coil shape by winding one end side of the insertion portion 2 about one and a half times and rounding to the tip, but the retaining pin 1A according to another embodiment. Although the retaining portion 3A is formed by winding one end side of the insertion portion 2 in the same manner, the angle θ1 formed by the orientation of the distal end portion of the retaining portion 3A and the insertion portion 2 is less than 90 °. It has been cut and processed. In addition, although the front-end | tip part of 3 A of retaining parts protrudes from the outer peripheral surface of 3 A of retaining parts, it cut | disconnects so that the distance a which protrudes from the outer peripheral surface of 3 A of retaining parts may be 10 mm or less. If the protruding distance a is 10 mm or less, there will be no obstacle in handling.

  Moreover, although the latching | locking part 4a provided in the coil spring member 4 of the retaining pin 1 shown in FIG. 1 is formed by inverting a part of the other end side of the coil spring member 4, it was shown in FIG. The locking part 4c of the retaining pin 1A is formed by offsetting a part of the other end side of the coil spring member 4A, that is, in a state in which the axis of the spring part 4b is shifted from the axis of the locking part 4c. ing. Further, the opening θ2 of the connecting portion 4d with the retaining portion 3A formed on one end side of the coil spring member 4A is set to be small (for example, at an angle of about 30 to 35 °).

  According to the retaining pin 1A having such a configuration, the retaining portion 3A is formed by winding one end side of the insertion portion 2, and the angle formed by the direction of the distal end portion of the retaining portion 3A and the insertion portion 2 is less than 90 °. In this position, the tip of the retaining portion 3A is cut and processed, so there is no need to process the tip of the retaining portion 3A in an annular shape, the processing work becomes easier, and the manufacturing cost can be further reduced.

  Further, since the locking portion 4c of the retaining pin 1A is formed by offsetting a part of the other end side of the coil spring member 4A, the part cost can be suppressed by using a part of the coil spring member 4. It is also possible to easily adjust the length of the coil spring member 4A and the locking portion 4c. Further, the positional relationship between the insertion portion 2 and the spring portion 4b can be finely adjusted by adjusting the opening θ2 of the connecting portion 4d.

  The length and thickness of the insertion part 3 constituting the retaining pins 1 and 1A, the shape of the retaining parts 3 and 3A, the material of the coil spring members 4 and 4A, the wire diameter of the spring, the coil diameter, the number of turns, etc. Needless to say, the shaft member can be appropriately changed in consideration of the shaft diameter of the shaft member and the hole diameter of the insertion hole.

DESCRIPTION OF SYMBOLS 1, 1A Retaining pin 2 Insertion part 3, 3A Retaining part 4, 4A Coil spring member 4a, 4c Locking part 4b Spring part 10 Pin bolt (shaft member)
11 Screw part 12 Insertion hole 20 Nut (coupling member)

Claims (5)

A retaining pin that is attached to an insertion hole formed in the shaft member and prevents the coupling member coupled to the shaft member from being detached from the shaft member,
A rod-shaped insertion part to be inserted into the insertion hole of the shaft member;
A retaining portion formed at one end of the insertion portion;
A coil spring member having one end side connected to the retaining portion and an annular locking portion that is detachably locked to the other end of the insertion portion on the other end side, the coil spring member having a shorter length than the insertion portion; Retaining pin characterized by having. The retaining portion is formed by winding one end side of the insertion portion,
The retaining pin according to claim 1, wherein the distal end portion of the retaining portion is cut at a position where an angle formed by the direction of the distal end portion of the retaining portion and the insertion portion is less than 90 °. .   The retaining pin according to claim 1 or 2, wherein the locking portion is formed by reversing or offsetting a part of the other end side of the coil spring member.   The said coil spring member consists of a tension coil spring using a stainless steel wire, and has a spring constant of 0.6-1.0 (N / mm), The any one of Claims 1-3 characterized by the above-mentioned. Retaining pin according to item.   The ratio of the length of the said insertion part and the said coil spring member is set so that it may become the range of 7: 4-7: 5, The term in any one of Claims 1-4 characterized by the above-mentioned. Retaining pin.

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