JP4544616B2 - Retaining pin - Google Patents

Description

  The present invention relates to a pin with a retainer that is used when, for example, various members are connected to each other so as to be relatively rotatable (swingable) when assembling various devices.

  As this kind of retaining pin, patent documents cannot be disclosed specifically, but a rod-shaped retaining tool is rotatably supported at the fork of the tip of the pin, and the pin is inserted into the pin hole of the assembly target member. When inserting, the retaining device is inserted into the pin hole in a state of releasing the retaining device facing the extending direction of the pin, and the retaining device protruding outward from the pin hole is retained perpendicular to the pin length direction. What is rotated to posture is known.

  In the configuration of the pin with a retaining ring as described above, the retaining member is integrated with the pin, and therefore has an advantage that it is easy to handle compared to a retaining device attached to the pin when necessary. If the assembly target part connected by a pin is configured such that the pin hole into which the pin is inserted is divided into two members separated from each other, the pin is extended while the pin passes through the pin hole. When the retainer in the retaining release posture that faces the direction passes between the two members, the retainer rotates to the retaining action posture due to gravity, and the retainer is caught in the middle of the pin hole. There was a risk that it would be impossible to assemble. Therefore, in such a case, it has been necessary to prepare a pin with a retaining type in which a separate retaining member is attached to the tip of the pin protruding from the pin hole.

An object of the present invention is to provide a pin with a retainer that can solve the above-described conventional problems, and the means is shown with reference numerals of embodiments to be described later. 1. A retaining pin in which a retaining device 2 is supported by a front end bifurcated portion 5 of the pin 1. The retaining device 2 swings on the pin 1 at a base portion that fits into the distal end bifurcated portion 5 of the pin 1. Elasticity that is freely supported by the shaft and that automatically and selectively locks the retaining member 2 between a retaining release posture that faces the extending direction of the pin 1 and a right-and-left lateral retaining posture that is orthogonal to the pin 1. In the pin with the retaining means provided with the locking means 13 , the retaining tool 2 is formed by folding a belt-shaped leaf spring material into a V shape, and the free end side of the both side plate portions 8 has the pin 1. A loosely fitted shaft is supported in the bifurcated portion 5 at the tip, and the elastic locking means 13 The protrusions 12 projecting from at least one of the side plate portions 8 of the stopper 2, the tip perpendicular end surface 6 a of at least one side wall portion 6 of the tip bifurcated portion 5 of the pin 1, and the pin length direction When the retainer 2 is in the retainer release posture, the projection 12 abuts on the end surface perpendicular to the front end 6a of the side wall 6 and the retainer 2 is retained. When in the working posture, the projection 12 abuts against the side surface 6b or 6c of the side wall portion 6 and elastically displaces the side plate portion 8 provided with the projection 12 to inwardly move the projection 12 to the pin 1. It is the structure which can be rotated within the front- end bifurcated part 5 .

In carrying out the present invention with the above configuration, as described in claim 2 , the protrusion 12 is formed integrally with the side plate 8 of the retainer 2 by projecting one side of the linear cut into a substantially semicircular shape. The linear cut side 11 of the protrusion 12 can be configured to abut against the end surface 6a or the side surface 6b or 6c of the side wall 6 of the tip bifurcated portion 5 of the pin 1. Further, according to a third aspect of the present invention, both side plate portions 8 of the retainer 2 are formed with burring holes 10 in which the cylindrical shaft portions 9 protrude outwardly, and both the cylindrical shaft portions 9 are formed. Are fitted into bearing holes 7 concentrically provided on both side wall portions 6 of the tip bifurcated portion 5 of the pin 1 from the inside, whereby the retainer 2 can be pivotally supported on the pin 1.

According to the pin with a retainer according to the present invention having the above-described configuration, the retainer supported on the bifurcated portion of the tip of the pin can be selectively locked between the retainer releasing posture and the retaining action posture. Therefore, when inserting the pin into the pin hole, even if there is a space that allows the stopper to rotate in the middle of the pin hole by locking the stopper in the retaining release posture. The tip of the pin equipped with a stopper can be securely penetrated to the opposite side of the pin hole, eliminating the risk that the stopper will rotate and catch in the middle of the pin hole, greatly improving workability be able to. In addition, if the tip of the pin with the stopper is penetrated to the opposite side of the pin hole, the locking by the elastic locking means is released and the stopper is rotated at a right angle to make it come into the retaining action posture. By automatically locking the switched retainer with elastic locking means, the retainer can be securely held in the retaining action position, and the retainer rotates unexpectedly due to vibration or the like to release the retainer. There is no risk of becoming a state, and safety can be greatly improved. Furthermore, according to the structure of this invention, the number of parts of the whole retaining tool including the retaining means can be reduced, the structure can be made extremely simple, and it can be implemented at low cost.

In addition, when implementing the pin with a retaining pin which concerns on this invention, the structure of Claim 2 or 3 is employable.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. Reference numeral 1 denotes a pin, and 2 denotes a retainer. The pin 1 has a cylindrical shaft shape having a bulging head 3 at one end, and a tip bifurcated portion 5 is formed at the other end by a notch 4 formed at a predetermined depth along the axial direction from the end face. . Circular bearing holes 7 are provided concentrically on the left and right side walls 6 of the bifurcated tip 5.

  The retainer 2 is formed by folding a belt-shaped leaf spring material into a V shape, and has an outer diameter cylinder that can be fitted into the bearing hole 7 at each of the arc-shaped free ends of both side plate portions 8. A burring hole 10 having an outer shaft 9 is formed on the outer side of the U-turn portion 2a side of the retainer 2 at a predetermined distance from the burring hole 10. A straight notch 11 orthogonal to the length direction of the tool 2 is provided, and the U-turn part 2a side of the retainer 2 is protruded outward in a substantially semicircular shape with respect to the straight notch. And a protruding portion 12 formed integrally therewith. Accordingly, the straight cut 11 becomes the straight cut side of the protrusion 12 (hereinafter referred to as the straight cut side 11 of the protrusion 12).

  The retainer 2 having the above-described configuration has the arc-shaped free end in the tip bifurcated portion 5 of the pin 1 (in the notch 4) with the both side plate portions 8 being sandwiched between the fingertips so as to approach each other against elasticity. The cylindrical shaft portions 9 of both burring holes 10 are fitted to the pair of left and right bearing holes 7 in the tip bifurcated portion 5 of the pin 1 outwardly from the inside using the elastic return of both side plate portions 8. At this time, as shown in FIGS. 1A, 3, and 4, when the retainer 2 is in a retaining release posture facing the extending direction of the pin 1, the pair of left and right protrusions 12 are The straight cut side 11 comes into contact with the front end perpendicular end surface 6a of the side wall 6 at the front end bifurcated portion 5 of the pin 1. Further, as shown in FIG. 1B, when the retainer 2 is in a retaining action posture at a right angle to the pin 1, the pair of left and right projections 12 are formed at the bifurcated portion 5 at the tip end of the pin 1. The straight cut side 11 is brought into contact with the side surface 6b or 6c parallel to the pin length direction of the side wall portions 6. In other words, the pair of left and right protrusions 12 are formed at the position where such a state is achieved.

  Thus, when the retaining device 2 is switched from one of the retaining mechanism releasing posture facing the extending direction of the pin 1 and the retaining mechanism posture perpendicular to the pin 1 to the other, the retaining device 2 The both side plate portions 8 are sandwiched between the fingertips against the elasticity so as to be close to each other in the vicinity of the position of the projecting portion 12, and the projecting portion 12 is in the notch 4 in the bifurcated portion 5 of the tip 1 (between both side wall portions 6) Transform to get inside. At this time, the protruding amount of the cylindrical shaft portion 9 is sufficiently larger than the protruding amount of the protruding portion 12 so that the cylindrical shaft portion 9 does not come out of the pair of left and right bearing holes 7 in the tip bifurcated portion 5 of the pin 1. It is enlarged. In this state, the retainer 2 is rotated around the pair of left and right cylindrical shafts 9 to switch the posture of the retainer 2. The pair of left and right protrusions 12 are formed by using elastic recovery of both side plate portions 8 of the retainer 2, and the straight cut side 11 is perpendicular to the tips of both side walls 6 at the tip bifurcated portion 5 of the pin 1. What is necessary is just to return outside so that it may contact | abut to the end surface 6a or the side surface 6b or 6c.

  As is apparent from the above operation, in this embodiment, the elastic locking means 13 that automatically and selectively locks the retaining device 2 between the retaining release posture and the retaining motion posture is an elastic retaining device having elasticity. 2 side plate portions 8, projecting portions 12 projecting from the both side plate portions 8, and right end surfaces 6 a and side surfaces 6 b and 6 c in both side wall portions 6 of the tip bifurcated portion 5 of the pin 1. .

  FIG. 1 shows that an outer member A having a pair of left and right side plates 14a and 14b and an inner member B having a pair of left and right side plates that are loosely fitted between the side plates 15a and 15b are coupled by a pin 1 with a retaining structure as described above. It shows how to use it. In this case, in the side plates 14a to 15b of the members A and B, as shown in FIG. 1A, a pin hole 16 having a minimum necessary inner diameter through which the retainer 2 and the pin 1 that are switched to the retainer release posture can be inserted. , 17 are formed concentrically.

  Thus, as shown in FIG. 1A, the pin 1 in a state where the retainer 2 is switched to the retainer release posture is inserted into the pin holes 16 and 17 from the tip (U-turn portion 2a) side of the retainer 2. Let At this time, even if the stopper 2 is intended to rotate around the cylindrical shaft portion 9, the straight cut side 11 of the protrusion 12 is formed on the right end surface 6 a of the both side walls 6 of the tip bifurcated portion 5 of the pin 1. The pair of left and right side plates of the inner member B are held by the elastic locking means 13 in a release-released release posture extending in the extending direction of the pin 1. When the stopper 2 passes between 15a and 15b, the stopper 2 rotates unexpectedly due to gravity or the like, and the tip (U-turn portion 2a) cannot be inserted into the pin hole 17 of the inner member B. There is no fear.

  As shown in FIG. 1B, if the pin 1 penetrates between both the members A and B, the retainer 2 protruding from the outer member A is changed from the retainer releasing posture to the retaining action posture as described above. Rotate 90 degrees. As a result, the retainer 2 is automatically held by the elastic locking means 13 in a right-and-left lateral retaining action posture with respect to the pin 1, so that the pin 1 is held in a state in which both members A and B are coupled. There is no risk of accidentally falling out of the pin holes 16 and 17.

  In addition, in the said embodiment, although the projection part 12 was arrange | positioned on the right-and-left both sides of the retainer 2, only either one may be sufficient. The protrusion 12 can also be configured by attaching another member to the retainer 2. Furthermore, although the number of parts will increase, an elastic material such as a leaf spring is attached to the side surface of the stopper 2, and the protrusion 12 is integrated with the free end portion of this elastic material or by attaching another part. It can also be configured. Moreover, although what used the bulging head 3 at one end as the pin 1 was utilized, depending on the case, the pin provided with the stopper 2 at both ends may be used. In order to pivotally support the base portion of the stopper 2 in the tip bifurcated portion 5 of the pin 1, a shaft which is a separate member may be used in combination.

Fig. A is a side view showing a pin with retaining just before use, and Fig. B is a partially longitudinal side view showing a state in which the pin is used. Fig. A is a partially cross-sectional plan view showing a state in which the pin and the retainer are separated, and Fig. B is a side view of the same state. It is a cross-sectional top view of a pin with a retaining ring. It is a vertical side view of a pin with a retaining ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pin 2 Retaining tool 3 Pin bulging head 4 Notch 5 Pin tip bifurcated part 6 Left and right side wall part 7 of tip bifurcated part 7 Bearing hole 8 Both sides plate part 9 of retaining tool Cylindrical shaft part 10 Burring hole 11 Straight line notch Side 12 Protrusion 13 Elastic locking means 14a-15b Side plates 16, 17 of inner and outer members A, B Pin holes

Claims (3)

A pin with a retaining member in which a retaining tool is supported on the bifurcated portion of the tip of the pin, and the retaining device is pivotally supported by the pin at a base portion that fits in the bifurcated portion of the tip of the pin. retaining the resilient locking means for automatically locking alternatively a perpendicular lateral retaining action posture orthogonal to the pin and a release position retaining faces in the extending direction of the pin a stop loss is juxtaposed In the pin with
The retainer is configured by folding a belt-shaped leaf spring material into a V shape, the free end side of both side plate portions is loosely supported in the bifurcated portion of the tip, and the elastic locking means is Of the both side plate portions of the retainer, the projection portion is formed to project from at least one side, the tip perpendicular end surface of at least one side wall portion of the tip bifurcated portion of the pin, and a side surface parallel to the pin length direction. When the retainer is in the retainer release posture, the projection comes into contact with the right-angled end surface of the side wall, and when the retainer is in the retainer acting posture, the protrusion is on the side surface of the sidewall. A pin with a retainer configured to be able to rotate in the bifurcated portion of the tip of the pin by abutting and elastically displacing the side plate portion provided with the projecting portion inward . The protrusion is integrally formed by projecting one side of the linear cut into a substantially semicircular shape on the side plate of the retainer, and the straight cut side of the protrusion is a side wall at the bifurcated end of the pin. The pin with a retaining ring according to claim 1, wherein the pin is configured to contact an end surface or a side surface of the portion . Both side plate portions of the retainer are formed with burring holes projecting outwardly from the cylindrical shaft portion, and both the cylindrical shaft portions are provided concentrically on both side walls of the bifurcated portion of the tip of the pin. The retaining pin according to claim 1, wherein the pin is fitted into each of the bearing holes from the inside .