Anti-falling bolt

Abstract

The utility model aims to solve the problems that a shaft pin falls off and a cotter pin is complex to operate in the prior art, discloses an anti-falling bolt, and belongs to the field of pin shaft connecting tools. The anti-falling bolt comprises a bolt body, an anti-falling device and a cylindrical pin. A base is arranged at one end of the bolt body; an insertion sheet is arranged in the middle of the other end of the bolt body; a bolt shaft is arranged between the base and the insertion sheet; the anti-falling device is located at the position of the inserting piece, and the inserting piece is inserted into the anti-falling device. A gap is formed between one end, facing the bolt shaft, of the anti-falling device and the bolt shaft; the cylindrical pin is arranged in the combined structure of the anti-falling device and the insertion piece in a penetrating mode, and the anti-falling device can deflect with the cylindrical pin as the deflection center. According to the anti-falling bolt, the anti-falling effect of the bolt is achieved, and meanwhile the operation procedures of mounting and dismounting are greatly simplified.

Description

Technical Field

[0001] The utility model relates to the field of pin connection tools, in particular to an anti-dropping plug pin. Background Art

[0002] The pin is mainly used at the hinge of two parts to form a hinge connection, so that the connected components can rotate relative to each other. It is widely used in the field of mechanical equipment manufacturing and has the advantage of not easily damaging the connecting parts. The pin is generally fixed with a split pin. This operation method requires inserting the split pin into the safety hole, using tools such as hawkbill pliers to bend the split pin tail, and wrap it around the pin shaft to fix it. When removing it, it is also necessary to use an external tool to straighten the pin tail first, and then pull out the plug safety hole.

[0003] When using a cotter pin, the tightening effect cannot be achieved by manpower alone. The cotter pin must be hammered with the help of an external tool to make it fit tightly with the plug pin. When the diameter of the cotter pin tail is too large, it is difficult to restore and remove it, and the operation is troublesome. At the same time, during the use of the project, the toughness of the cotter pin will be greatly reduced due to the performance problems of the manufacturing materials, and the effect of repeated use can not be achieved. Moreover, other existing methods of preventing the plug from falling off are almost separate components, and there are problems such as large size of the anti-falling device and inconvenient operation and storage, which bring inconvenience to the user. Utility Model Content

[0004] The utility model solves the problem of inconvenient operation of the traditional method for fixing the latch in the prior art and provides an anti-dropping latch, which can achieve the anti-dropping effect of the latch and greatly simplify the operation process of installation and disassembly.

[0005] The technical solution adopted by the utility model is:

[0006] An anti-dropping latch, comprising

[0007] The bolt body is cylindrical and has a base at one end; an insert is provided in the middle of the other end of the bolt body; the portion between the base and the insert is the bolt shaft;

[0008] an anti-slip device, the anti-slip device is located at the inserting piece, and the inserting piece is inserted into the anti-slip device; there is a gap between one end of the anti-slip device facing the latch shaft and the latch shaft;

[0009] A cylindrical pin is inserted into the combined structure of the anti-slip device and the insert, and the anti-slip device can deflect with the cylindrical pin as the deflection center.

[0010] Furthermore, the anti-falling device comprises

[0011] The clip is cylindrical, and one end of the clip is provided with a U-shaped installation groove along its radial direction; the insert is inserted into the installation groove; the clip is provided with a spring installation cavity B on both sides of the installation groove; the corresponding end surface of the bolt shaft is provided with a spring installation cavity A corresponding to the spring installation cavity B; the clip is connected to the bolt body through the cylindrical pin;

[0012] A spring, a part of which is arranged in the spring installation cavity A, and the other part of which is arranged in the corresponding spring installation cavity B, and the angle between the direction of the spring force and the axial center of the bolt body exists, and under the action of the spring, the clip has a tendency to deflect around the cylindrical pin toward the surface direction protruding from the bolt body.

[0013] Furthermore, a conical surface is provided on an edge of one end of the clip away from the latch shaft.

[0014] Furthermore, the diameter of the clip is consistent with that of the latch body.

[0015] Furthermore, the diameter of the clip is greater than or equal to the axial length of the cylindrical pin.

[0016] Furthermore, after the clip is deflected, the position of the clip abutting against the latch shaft can be chamfered to form a chamfered surface.

[0017] Furthermore, after the clip is deflected, the edge of the clip away from the latch shaft extends along the axial direction of the clip to form a protrusion, and the edge of the corresponding latch shaft forms a notch that matches the protrusion.

[0018] Furthermore, the spring is a torsion spring.

[0019] Furthermore, the spring is a V-shaped spring.

[0020] The beneficial effects of the utility model are as follows: the entire anti-dropout plug is an integrated structure. Compared with the existing anti-dropout plug, the anti-dropout device and the plug body are connected by a cylindrical pin, which is not easy to separate and is easy to carry. In use, it is only necessary to manually turn the clip to be coaxial with the plug body before inserting the plug. After the external parts are inserted, the spring automatically drives the clip to rotate and lock the position, which is convenient to use and avoids the use of external tools. At the same time, the removal method is consistent with the insertion method, and the maintenance and replacement operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 Schematic diagram of the anti-dropping latch structure in the embodiment.

[0023] Figure 2 Schematic diagram of the clamp structure in the embodiment.

[0024] Figure 3 Schematic diagram of the cross-sectional structure of the anti-dropping pin calibration working state in the embodiment Figure 1 .

[0025] Figure 4 Schematic diagram of the cross-sectional structure of the anti-dropping pin calibration working state in the embodiment Figure 2 .

[0026] Figure 5 2 is a top view of a cross-sectional view of a latch body in an embodiment.

[0027] In the figure: 1-latch body, 11-latch shaft, 111-spring installation cavity A, 12-insert piece, 121-installation through hole A, 13-base, 2-anti-slip device, 21-clip, 211-conical surface, 212-ear, 213-installation through hole B, 214-spring installation cavity B, 215-beveled surface, 216-protrusion, 22-spring, 3-cylindrical pin. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0030] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0031] In this embodiment, an anti-dropping latch is provided. Figures 1 to 5 , which includes a plug body 1. The plug body 1 is cylindrical, and one end of it has a base 13, and the base 13 is used to limit the insertion depth of the plug when it is inserted into an external part, and to facilitate the subsequent removal of the plug. A plug piece 12 is provided in the middle of the other end of the plug body 1, and a mounting through hole A121 is provided on the plug piece 12, and the plug piece 12 is used for the subsequent installation of other components; the middle part of the plug body 1 is a plug shaft 11, and the plug shaft 11 is the main part of the effective contact area between the plug body 1 and the external part, and the plug shaft 11 can realize relative coaxial rotation between external parts; the end of the plug shaft 11 is provided with spring installation cavities A111 on both sides of the position of the plug piece 12, and the spring installation cavity A111 is used for the subsequent placement of some components of the anti-drop device.

[0032] The anti-dropping plug also includes a cylindrical pin 3. The cylindrical pin 3 is located at the plug 12 and is connected to other components through the mounting through hole A121 to achieve relative coaxial rotation between the connecting parts. The cylindrical pin 3 has the same diameter as the mounting through hole A121, and its length is slightly smaller than the diameter of the plug shaft 11.

[0033] The anti-slipping plug also includes an anti-slipping device 2. The anti-slipping device 2 is located at the plug 12, and the anti-slipping device 2 is provided with a mounting through hole B213 corresponding to the mounting through hole A121. The cylindrical pin 3 is inserted into the combined structure of the mounting through hole A121 on the plug 12 and the mounting through hole B213 on the anti-slipping device 2, so as to realize the axial connection between the anti-slipping device 2 and the plug 12. The mounting through hole A121 and the mounting through hole B213 have the same diameter to ensure that there is no relative displacement between the plug body 1 and the anti-slipping device 2 during use. As a result, the anti-slipping device 2 can deflect with the cylindrical pin 3 as the deflection center. When the anti-slip device 2 is deflected, that is, when a certain angle exists between the axial center of the anti-slip device 2 and the axial center of the latch body 1, part of the surface of the anti-slip device 2 protrudes from the surface of the latch body 1, and the other end of the anti-slip device 2 abuts against the edge of the latch shaft 11, thereby realizing the anti-slip function and locking the position of the anti-slip latch.

[0034] The anti-drop device of this embodiment is composed of a clip 21 and a spring 22. Figure 2The clip 21 is cylindrical, and its diameter is consistent with the diameter of the plug body 1 and the length of the cylindrical pin 3. A conical surface 211 is provided on the edge of one end of the clip 21, and the conical surface 211 can prevent the plug from being bumped and worn when inserted into external parts. The other end of the clip 21 is provided with a U-shaped installation groove along its radial direction, and one end of the installation groove in the groove length direction is not through. The groove width of the installation groove is the same as the thickness of the plug 12, and the installation groove is used to insert the plug 12 when the plug body 1 and the anti-slip device 2 are combined. The clip 21 forms a structure similar to the ear 212 on both sides of the installation groove, and the installation through hole B213 is provided on the two oppositely arranged ears 212. The clip 21 is provided with a spring installation cavity B214 on both sides of the notch of the installation groove. A portion of the spring 22 is located in the spring installation cavity A111, and the other portion is located in the corresponding spring installation cavity B214, and the force direction of the spring 22 is at a certain angle to the axial center of the latch body 1. Therefore, under the force of the spring 22, the clip 21 keeps deflecting around the pin shaft 3 toward the surface protruding from the latch body 1.

[0035] In this embodiment, when the axial center of the clip 21 coincides with the axial center of the latch body 1, a certain distance is reserved between the end of the clip 21 facing the latch shaft 11 and the latch shaft 11 to prevent the clip 21 from completely interlocking with the latch shaft 11 when rotating, and preventing deflection. Further, after the clip 21 deflects, the position of the clip 21 that abuts against the latch shaft 11 can be chamfered, that is, part of the edge of the clip 21 can be cut off, and the position where the clip 21 is cut off forms a chamfered surface 215, and the chamfered surface 215 can increase the deflection angle of the clip 21. At the same time, after the clip 21 is deflected, the edge of the clip 21 away from the bolt shaft 11 extends in the axial direction of the clip 21 to form a protrusion 216, and the corresponding edge of the bolt shaft 11 forms a notch that matches the protrusion 216. The protrusion 216 increases the maximum distance between the clip 21 and the axis of the cylindrical pin 3 after deflection, and further increases the range of the projection of the diameter of the bolt body 1 after the clip 21 is deflected, thereby enhancing the limiting effect of the anti-slip device 2. When the axial center of the clip 21 coincides with the axial center of the bolt body 1, the protrusion can be received in the notch.

[0036] In this embodiment, the springs 22 on both sides are torsion springs, and the lengths of the force arms extending from the spring coils on both sides of the torsion springs are different. The shorter end of the force arm is welded in the spring installation cavity A111, and the longer end of the force arm is glued and fixed in the spring installation cavity B214. It should be noted that since the spring installation cavity B214 is set on the clip 21, when the clip 21 deflects with the cylindrical pin 3 as the axis, the spring installation cavity B214 will deflect accordingly. At this time, it is necessary to ensure that the design size and opening position of the spring installation cavity B214 will not affect the normal deformation of the spring 22. That is, when the clip 21 deflects, the spring 22 does not come into contact with other parts except for the connection parts with the spring installation cavity A111 and the spring installation cavity B214 during the deformation process, causing the spring 22 to deform abnormally, affecting the service life of the spring.

[0037] Reference Figure 3 In this embodiment, before the latch body 1 is inserted into the inner wall of the external part, the clip 21 has kinetic energy to rotate counterclockwise in a natural state under the influence of the elastic potential energy of the spring 22, and presses against the end of the latch shaft 11 under the action of the kinetic energy. The elastic force provided by the spring 22, the supporting force provided by the latch shaft 11 and the supporting force provided by the cylindrical pin 3 balance the forces on the clip 21 and limit the position of the clip 21. Unless a clockwise torsional force is applied to the clip 21 with the cylindrical pin 3 as the axis, the spring 22 will not produce compression deformation, so the anti-dropping latch structure is stable in a natural state, which is conducive to improving safety and stability during use.

[0038] Reference Figure 4 In this embodiment, when the latch body 1 is inserted into the inner wall of the external part, the clip 21 is pulled clockwise to be coaxial with the latch body 1. The end of the spring 22 welded to the spring installation cavity A111 does not deform, but the end connected to the spring installation cavity B214 is displaced and deformed, and the elastic potential energy increases. During the insertion process, the outer wall of the clip 21 is tightly attached to the inner wall of the other external part, forming an interaction force, which inhibits the rebound of the spring 22, so that the clip 21 does not rotate counterclockwise and can pass through the inner wall of the external part smoothly.

[0039] In this embodiment, after the clip 21 is fully extended from the external part, the support force provided by the external part disappears. The spring 22 is free from external force restriction, and the end connected to the spring installation cavity B214 automatically pops out and moves to the position before inserting the external part. At the same time, the spring 22 drives the clip 21 to rotate counterclockwise, and finally the clip 21 abuts against the latch shaft 11 and returns to the position. Figure 3At this time, the coaxial relationship between the clip 21 and the bolt body 1 changes, and the clip 21 will protrude from the diameter projection range of the bolt body 1. This part limits the anti-dropout bolt from falling off in the opposite direction of insertion. At the same time, the base 13 limits the anti-dropout bolt from falling off in the insertion direction. The two directions limit each other, achieving the anti-dropout effect of the bolt.

[0040] When removing the latch, rotate the clip 21 clockwise to make it coaxial with the latch body 1, and then withdraw it along the inner wall of the external part in the opposite direction of insertion. In the utility model, the latch body 1, the anti-slip device 2, and the cylindrical pin 3 are all integrated components before and after use, and the volume is small; and the position change of the locking structure is automatically realized by the spring 22, without the use of external tools, and the operation is convenient, which solves the problem of the troublesome operation of using a cotter pin for anti-slip treatment. Under the action of non-artificial external force, the spring 22 is not easily affected by the torsional force, so it is difficult to deform, so that the problem of the clip 21 rotating will not occur in the working state, and the locking effect is good.

Claims

1. An anti-dropping latch, characterized in that: A bolt body (1), the bolt body (1) being cylindrical and having a base (13) at one end; an inserting piece (12) is arranged in the middle of the other end of the bolt body (1); the portion between the base (13) and the inserting piece (12) is a bolt shaft (11); an anti-slip device (2), the anti-slip device (2) being located at the inserting piece (12), and the inserting piece (12) being inserted into the anti-slip device (2); a gap exists between one end of the anti-slip device (2) facing the latch shaft (11) and the latch shaft (11); A cylindrical pin (3), the cylindrical pin (3) being inserted into a combined structure of the anti-slip device (2) and the insert (12), and the anti-slip device (2) being capable of deflecting with the cylindrical pin (3) as a deflection center.

2. The anti-dropping latch according to claim 1, characterized in that: The anti-slip device (2) comprises A clip (21), the clip (21) being cylindrical, and having one end provided with a U-shaped installation groove along its radial direction; the inserting piece (12) being inserted into the installation groove; the clip (21) being provided with spring installation cavities B (214) on both sides of the notch of the installation groove; a spring installation cavity A (111) corresponding to the spring installation cavity B (214) being provided on the end surface of the corresponding latch shaft (11); the clip (21) being connected to the latch body (1) via the cylindrical pin (3); A spring (22), wherein a portion of the spring (22) is disposed in the spring mounting cavity A (111), and another portion of the spring (22) is disposed in the corresponding spring mounting cavity B (214), and an angle is formed between the direction of the force of the spring (22) and the axial center of the latch body (1), so that under the force of the spring (22), the clip (21) has a tendency to deflect around the cylindrical pin (3) toward a surface protruding from the latch body (1).

3. The anti-dropping latch according to claim 2, characterized in that: A conical surface (211) is provided on the edge of one end of the clip (21) away from the latch shaft.

4. An anti-dropout latch according to claim 2 or 3, characterized in that: The diameter of the clip (21) is consistent with that of the latch body (1).

5. The anti-dropping latch according to claim 4, characterized in that: The diameter of the clip (21) is greater than or equal to the axial length of the cylindrical pin (3).

6. An anti-dropout latch according to claim 2 or 3, characterized in that: After the clip (21) is deflected, the position of the clip (21) abutting against the latch shaft (11) can be chamfered to form a chamfered surface (215).

7. An anti-dropout latch according to claim 2 or 3, characterized in that: After the clip (21) is deflected, the edge of the clip (21) away from the latch shaft (11) extends in the axial direction of the clip (21) to form a protrusion (216), and the corresponding edge of the latch shaft (11) forms a notch that matches the protrusion (216).

8. The anti-dropping latch according to claim 2 or 3, characterized in that: The spring (22) is a torsion spring.

9. An anti-dropout latch according to claim 2 or 3, characterized in that: The spring (22) is a V-shaped spring sheet.

Images