JPH053797Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a connecting link, and more specifically, in a link that is provided with a member for preventing the pivot pin that pivots a pair of link bodies from coming off, The present invention relates to a connecting link that has excellent durability and safety against impact, abrasion, etc.

(Prior Art) Connecting links are widely used in all industrial fields, such as connecting chain members of chains used in fishing nets, cranes, etc., or connecting chains with fishing nets, hooks, etc.

The general structure of this type of connecting link is that a pair of approximately U-shaped link bodies are swingably supported by pivot pins, and a slip-off prevention member is provided to prevent the pivot pins from slipping out or falling off. Be prepared. In addition, the mechanism for preventing the pivot pin from coming off by means of the falling-off preventing member includes a small diameter locking portion formed in the axial center portion of the pivot pin, and a portion of the falling-off preventing member being formed in the small diameter locking portion. is resiliently locked by its own spring force to prevent the pivot pin from coming off in the axial direction.

By the way, since connecting links can be manufactured at low cost and are relatively often disassembled and replaced, this disassembly and assembly is possible without the use of special tools, and their use can be done under relatively harsh conditions. Therefore, conditions such as durability and safety that can withstand this abuse are basically required.

(Problems to be Solved by the Invention) However, none of the conventionally known coupling links particularly satisfies the above conditions, and improvements have been desired.

(1) That is, if the coupling link is repeatedly disassembled and assembled, the spring force of the above-mentioned slip-off prevention member itself weakens over time. As a result, the function of preventing the pivot pin from coming off in the axial direction is degraded, making it easier to come off, and its lifespan is relatively short.

(2) Since the pull-out prevention member is usually made of stainless steel such as SUS420, it may crack or break when external force is applied to it, which reduces the spring force of the pull-out prevention member. As a result, there is a risk that the pivot pin may come off and fall off, and the link body may be disassembled.

This invention has a structure that prevents the pivot pin from coming off with sufficient durability and safety against external impacts, abrasion, etc., and even when used under harsh conditions, the pivot pin can be easily The purpose is to provide a connecting link that prevents the link from coming off or coming off, and has excellent durability and safety.

(Means for Solving the Problems) In order to achieve the above object, the coupling link of the present invention includes a pair of substantially U-shaped link bodies, and a pivot support that pivots the two link bodies so as to be able to swing relative to each other. idea,
A slip-off prevention member that prevents the pivot pin from coming off from the link body, and the slip-off prevention member includes a substantially cylindrical stop member that is elastically deformable in the radial direction, and a stopper member that is elastically deformable in the radial direction. It has a double structure consisting of an elastic cylindrical stopper protection member that is integrally fitted to the outer periphery in a covering manner, and between the legs of the pair of link bodies,
The stopper member of the slip-off prevention member is elastically fitted into the small-diameter locking portion of the pivot pin.

Further, the stopper member is formed of a substantially cylindrical metal ring member that is elastically deformable in the radial direction, and the inner diameter of at least a portion of the metal ring member is
Preferably, the diameter is the same as or slightly smaller than the outer diameter of the small-diameter locking portion of the pivot pin, and the width of the metal ring member is set to be slightly narrower than the distance between the legs of the link body. be.

Furthermore, the stopper protection member is formed from a cylindrical elastic rubber member, and the inner diameter of the elastic rubber member is slightly smaller than the outer diameter of the stopper member, and the width thereof is the same as the width of the stopper member. Preferably, they are the same, and the elastic rubber member is tightly fitted to the outer periphery of the stopper member.

(Function) Between the legs of the pair of link bodies, the stopper member of the slip-off prevention member is elastically fitted into the small-diameter locking part of the pivot pin that pivotally supports both link bodies so as to be able to swing relative to each other. This effectively prevents the pivot pin from coming off or falling off in the axial direction.

The fall-off prevention member consists of a substantially cylindrical stopper member that can be elastically deformed in the radial direction, and an elastic cylindrical stopper protection member that is integrally fitted to the outer periphery of the stopper member. Due to the heavy structure, external force is relieved by the stopper protection member, and cracking and damage of the stopper member due to external force is prevented.

Furthermore, even if the stopper member is cracked or damaged, the spring force of the stopper protection member effectively prevents the stopper member from falling off.

Furthermore, since the stopper protection member covers the outer surface of the stopper member, it is possible to effectively reduce entanglement of threads or nets to the stopper member when used for fishing nets, for example.

These effects are achieved by forming the stopper protection member from a cylindrical elastic rubber member, the inner diameter of the elastic rubber member being slightly smaller than the outer diameter of the stopper member, and the width of the elastic rubber member being the same as the width of the stopper member. This can be effectively achieved by tightly fitting the elastic rubber member to the outer periphery of the stopper member.

The stopper member is formed of a substantially cylindrical metal ring member that is elastically deformable in the radial direction, and the inner diameter of at least a portion of the metal ring member is larger than the outer diameter of the small diameter locking portion of the pivot pin. The diameter of the metal ring member is the same or slightly smaller, and the width of the metal ring member is set to be slightly narrower than the distance between the legs of the link body.
The ability to hold the pivot pin and prevent it from falling out under severe usage conditions is ensured.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The first device to which the coupling link according to the present invention is applied is
As shown in the figure, the device is a chain/hook device having a hook F at one end of a chain C, and the chain C and the hook F are removably connected by a connecting link 1.

The coupling link 1 includes a pair of link bodies 2, 2 having the same shape, a pivot pin 3 that pivotally supports both the link bodies 2, 2 so as to be able to swing relative to each other, and the link body 2 of the pivot pin 3. .

The link body 2 is made of alloy steel and forged into a substantially U-shape. The link main body 2 includes substantially parallel leg portions 2a and 2b, the tip portions of which serve as pivot supports 5 and 6.

One of the pivot parts 5 is formed into a forked shape, as shown in FIGS. 1 and 4. Further, the width of the other pivot portion 6 is set to be slightly narrower than the interval between the aforementioned pivot portions 5. Further, both side surfaces of the pivot parts 5 and 6 are machined so as to be flat and parallel to each other.

Through holes 7, 8 and 9 having the same diameter are formed coaxially in the pivot parts 5 and 6, respectively, and the pivot pin 3 is inserted into these through holes.

In the illustrated example, the pair of link bodies 2, 2 have the same shape, but they may have different shapes as long as the structures of the mutual connection parts, that is, the pivot parts of these link bodies have corresponding shapes. may be taken as

The length of the pivot pin 3 is set approximately equal to the total width when the link bodies 2, 2 are assembled. As shown in FIG. 4, the pivot pin 3 has both end portions serving as pivot supports 3a, 3a,
The center portion is a locking portion 3b.

The shaft support 3a has a diameter that is approximately equal to or slightly smaller than the diameter of the through holes 7, 8, and 9,
On the other hand, the locking portion 3b has a slightly smaller diameter than the shaft support 3a. As a result, a stepped portion 3c is formed at the boundary between the shaft support 3a and the locking portion 3b.

The slip-off prevention member 4 has a double structure consisting of a stopper member 10 and a stopper protection member 11.

The stopper member 10 is for preventing the pivot pin 3 from coming off or falling off from the pair of link bodies 2, 2, and has a substantially cylindrical shape as shown in FIG.

That is, the stopper member 10 is formed by bending a metal plate having the shape of the imaginary line in FIG. 4 as shown by the solid line to form a substantially cylindrical metal ring member. The material of this stopper member 10 is
Stainless steel such as SUS420 is used, so that the stopper member 10 itself has a spring force and can be elastically deformed in the radial direction.

Further, the center portion of the stopper member 10 is fitted into and locked with the locking portion 3b of the pivot pin 3.
It is said that

The axial width of the stopper member 10 is set to be slightly narrower than the distance w between the legs 2a, 2b of the link body 2 (the distance when the pair of link bodies 2, 2 are assembled in FIG. 1). Further, the axial width of the locking portion 10a of the stopper member 10 is set to be slightly smaller than the axial width of the locking portion 3b of the pivot pin 3. Further, the inner diameter of the locking portion 10a is the same as or slightly smaller than the outer diameter of the locking portion 3b. Locking portion 10a of stopper member 10
The inner diameter of both sides of the pivot pin 3 is the pivot support 3a of the pivot pin 3,
3a, but if the diameter is the same as the inner diameter of the locking part 10a, the stopper member 1
0 is easy to manufacture and can provide sufficient spring force.

The stopper protection member 11 includes the stopper member 1
The stopper member 10 is used to protect the stopper member 10 from external forces such as impacts and to assist in preventing the stopper member 10 from coming off, and is specifically made of a cylindrical elastic rubber member. The rubber member of the stopper protection member 11 is not particularly limited as long as it can perform its function, but for example, urethane rubber is preferably used when used in cold regions.

The inner diameter of the stopper protection member 11 is slightly smaller than the outer diameter of the stopper member 10, and its axial width is the same as the width of the stopper member 10. As a result, the stopper protection member 11 is closely fitted to the outer periphery of the stopper member 10 and completely covers the outer periphery of the stopper member 10. Note that the stopper protection member 11 and the stopper member 10 are fitted together in advance before the coupling link 1 is assembled to form a unitized double-structure slip-off prevention member 4.

Next, the operation procedure for connecting the chain C and the hook F shown in FIGS. 1 and 2 using the connecting link 1 will be explained (see FIGS. 1 and 2).

Each link body 2, 2 is inserted into the chain member 12 at one end of the chain C and the connecting hole 13 of the hook F, respectively.

As shown in FIG. 1, the pivot parts 5 and 6 of both link bodies 2 and 2 are assembled together. Further, a slip-off prevention member 4 is positioned between these leg portions 2a and 2b. In this state, the through holes 7, 9 of the legs 2a, 2b of the link bodies 2, 2,
8. Fallout prevention member 4 and link body 2, 2
The axes of the leg portions 2a, 2b and the through holes 8, 9, 7 all coincide with each other.

By pushing and inserting the pivot pin 3 into these holes from either side, assembly of the connecting link 1 is completed, and the chain C and hook F are inserted.
will be connected.

Note that the pivot pin 3 is pushed in using a hammer,
This can be done by hitting with a punch, stone, etc., and no special tools are required.

Further, when the pivot pin 3 is inserted into the hole of the slip-off preventing member 4, the slip-off preventing member 4 is elastically deformed radially outward to allow the pivot pin 3 to pass through.
When the pivot pin 3 is inserted to the end, the locking portion 3b is inserted into the locking portion 10 of the slip-off prevention member 4.
As a result, the locking portion 10a elastically returns slightly radially inward and resiliently locks onto the outer circumferential surface of the locking portion 3b. Note that the end of the pivot pin 3 is inclined for ease of insertion.

Incidentally, the chain C and the hook F can be separated from the above-mentioned connected state by performing the operation opposite to the above.

However, after assembling the connecting link 1,
Movement of the pivot pin 3 in the axial direction is effectively prevented by the falling-off prevention member 4. This prevents the pivot pin 3 from coming off the link bodies 2, 2 due to normal external force while the chain hook device is in use, and prevents the coupling link 1 from disassembling. This situation will not occur.

Moreover, since the falling-off prevention member 4 has a double structure, the stopper protection member 11 that is integrally fitted to the outer periphery of the stopper member 10 acts as a buffer member for external force acting on the stopper member 10. function to prevent cracks in the stopper member 10 due to external force,
In order to effectively prevent damage, the spring force of the stopper member 10 is prevented from decreasing as much as possible.

Further, even if the stopper member 10 is cracked or damaged for some reason, the spring force of the stopper protection member 11 effectively prevents the dropout prevention function of the stopper member 10 from deteriorating.

(Effects of the invention) As detailed above, according to the invention, various effects as listed below can be obtained, and even when used under severe conditions, the accidental detachment of the pivot pin during use can be prevented. It is possible to provide a bonding link with excellent durability and safety.

(1) A fall-off prevention member that prevents the pivot pin from coming off or falling off in the axial direction is provided with a substantially cylindrical stopper member that is elastically deformable in the radial direction, and is integrally coated around the outer periphery of the stopper member. Since it has a double structure consisting of a combined elastic cylindrical stopper protection member, the stopper protection member
It functions as a buffer member for external force acting on the stopper member.

Therefore, the external force is alleviated by the stopper protection member, and the occurrence of cracks and damage to the stopper member due to the external force is effectively prevented. This prevents the spring force of the stopper member from decreasing as much as possible, and there is no possibility that the coupling link will disassemble during use.

(2) Furthermore, since the stopper protection member also functions as an auxiliary member for the spring force of the stopper member, even if the coupling link is disassembled and reassembled frequently, the spring force of the stopper member itself will not decrease over time. This prevents deterioration of the pivot pin's ability to prevent it from coming off as much as possible, resulting in a long life.

(3) Even if the stopper member is cracked or damaged for some reason, the spring force of the stopper protection member effectively prevents the dropout prevention function of the stopper member from deteriorating.

(4) Since the stopper protection member covers the outer surface of the stopper member, it effectively reduces entanglement of threads or nets to the stopper member when used for fishing nets, for example.

(5) The stopper protection member is formed from a cylindrical elastic rubber member, and the inner diameter of the elastic rubber member is slightly smaller than the outer diameter of the stopper member,
Its width is the same as the width of the stopper member,
As a result, if the elastic rubber member is tightly fitted to the outer periphery of the stopper member, the effects (1) to (4) above can be more effectively exerted.

(6) The stopper member is formed from a substantially cylindrical metal ring member that is elastically deformable in the radial direction, and the inner diameter of at least a portion of the metal ring member is the same as the outer diameter of the small diameter portion of the pivot pin. Alternatively, if the metal ring member has a slightly smaller diameter and the width of the metal ring member is set slightly narrower than the distance between the legs of the link body, it will ensure that the pivot pin can be held and prevented from falling out under severe usage conditions. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a state in which a connecting link according to an embodiment of the present invention is applied to a chain hook device, Fig. 2 is a side view of the same, and Fig. 3 is the same as that shown in Fig. 1. FIG. 4 is an exploded perspective view of the connecting link. 1... Combined link, 2... Link body, 3...
Pivot pin, 3b... Locking portion of the pivot pin, 4... Fallout prevention member, 10... Stopper member, 10a...
Locking portion of stopper member, 11... Stopper protection member, C... Chain, F... Hook.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of substantially U-shaped link bodies, a pivot pin that pivotally supports both link bodies so that they can swing relative to each other,
A fall-off prevention member that prevents the pivot pin from coming off from the link body, and the fall-off prevention member includes a substantially cylindrical stopper member that is elastically deformable in the radial direction, and a stopper member that is elastically deformable in the radial direction. It has a double structure consisting of an elastic cylindrical stopper protection member that is integrally fitted to the outer periphery in a covering manner, and between the legs of the pair of link bodies,
A coupling link characterized in that a stopper member of the slip-off prevention member is elastically fitted into a small diameter locking portion of the pivot pin. (2) The stopper member is formed of a substantially cylindrical metal ring member that is elastically deformable in the radial direction, and the inner diameter of at least a portion of the metal ring member is equal to the outer diameter of the small diameter locking portion of the pivot pin. The connecting link according to claim 1, wherein the metal ring member has a diameter that is the same or slightly smaller than that of the link body, and the width of the metal ring member is set to be slightly narrower than the distance between the legs of the link body. (3) The stopper protection member is formed from a cylindrical elastic rubber member, and the inner diameter of the elastic rubber member is slightly smaller than the outer diameter of the stopper member, and the width thereof is the same as the width of the stopper member. The connecting link according to claim 1, which is a registered utility model, and wherein the elastic rubber member is tightly fitted to the outer periphery of the stopper member.