JP7402512B2 - Lock structure of connecting rod - Google Patents

Description

The present invention relates to a lock nut for preventing the connected state of a connecting rod from being accidentally released, and a locking structure for the connecting rod.

2. Description of the Related Art Connecting rods 1 as shown in FIGS. 5 and 6, for example, have been used for tools and the like. This connecting rod 1 includes a connecting structure 4 that connects a pair of rods 2 and 3 to each other. This connection structure 4 includes a substantially cylindrical protrusion 5 protruding from the circumferential surface at the end of one bar 2, and a male screw portion 6 formed from the protrusion 5 slightly toward the center of the bar 2. , an accommodation recess 7 formed at the end of the other bar 3 for accommodating the end of one bar 2; An L-shaped notch 8, a nut 9 formed with a female thread that is screwed into the male thread 6, and an internal biasing element that is fitted into the end face of one bar 2 so as to be freely protrusive and retractable. It is composed of a push rod B that is urged by a spring A in a direction protruding from the end face.

The notch portion 8 has a longitudinal portion a whose one end reaches the edge of the other bar 3 and extends from this end toward the center of the bar 3 in parallel to the longitudinal direction of the bar 3; A circumferential part b extends in the circumferential direction of the bar 3 from the other end of the longitudinal part a, and a circumferential part b extends from the end of the circumferential part b opposite to the longitudinal part a toward one edge of the bar 3. It is composed of a housing part c extending parallel to the longitudinal direction of the material 3.

Thereby, when connecting the pair of bars 2 and 3 to each other, the end of one bar 2 is connected to the other by fitting the protrusion 5 into one end of the longitudinal direction a in the notch 8. The bar 3 is fitted into the accommodation recess 7 against the biasing force of the push bar B, and when the protrusion 5 reaches the circumferential portion b of the notch 8, one bar 2 is inserted into the other bar. It is rotated in the circumferential direction relative to the material 3. When the protrusion 5 reaches the accommodation part c in the notch 8, one bar 2 is pulled back a little in the direction away from the other bar 3 by the urging force of the push bar B, so that the protrusion 5 fits into the accommodating part c in the notch part 8.

By the way, although the connection of the bars 2 and 3 has been almost completed up to this point, if the protrusion 5 is unintentionally detached from the accommodation part C while using a tool etc., one bar 2 will become attached to the other. There is a risk that the connection may rotate relative to the bar 3 and the connection state may be undesirably released, which may be dangerous depending on the content of the work being performed using tools or the like.

Therefore, when the bars 2 and 3 are connected as described above, the nut 9 is turned and moved until it is pressed against the edge of the other bar 3. When the movement of the nut 9 is completed, the bar 2 can no longer move in the direction of the bar 3, and as a result, the protrusion 5 formed on the bar 2 is removed from the accommodating part c in the notch 8 around the periphery. Since movement in direction b is restricted, one bar 2 will not rotate undesirably relative to the other bar 3, and the connected state will be prevented from being undesirably released. It is now possible to do so.

Note that this structure that uses a nut to prevent one member from undesirably rotating relative to the other member is also used in "tension rods" as shown in Patent Document 1, for example. .

Utility model registration No. 3176045

However, even with the above-mentioned conventional locking structure using the nut 9, there is a problem that the nut 9 rotates during use of a tool, etc., and as a result, the connection state may be undesirably released. Ta.

The present invention has been made in view of these problems, and its purpose is to provide a lock nut that prevents the connection between a pair of bars from being undesirably released, and a connecting bar using the lock nut. The purpose is to provide a locking structure.

According to one aspect of the invention,
A locking structure of a connecting rod including a pair of rods and a lock nut,
The lock nut is
a first nut having a first female thread formed on the inner surface and a first male thread formed on the outer surface;
a second nut having an inner surface formed with a second female thread that engages with the first male thread;
The first female thread of the first nut is screwed into a male thread on the bar side formed at an end of one of the pair of bars,
The end of one of the rods is accommodated in the end of the other rod,
A protrusion protruding from the circumferential surface of the end of one of the bars is fitted into the circumferential surface of the other bar, and one end of the bar moves while being fitted onto the circumferential surface of the other bar. a longitudinal part extending from the one end toward the center of the other bar, a circumferential part extending from the other end of the longitudinal part in the circumferential direction of the other bar, and a circumferential part in the circumferential part. A cutout portion is formed that has a housing portion extending from an end opposite to the longitudinal portion toward a tip edge of the other bar,
A male thread on the bar side is formed on the circumferential side of the end of one of the bars,
With the protrusion accommodated in the notch, the first female screw is screwed into the male screw on the bar side in a direction in which one of the bars is separated from the other bar. A locking structure for a joint rod is provided, in which an end face of the first nut presses and urges an end face of the other bar, and an end face of the second nut presses and urges one of the bars.

According to the lock nut according to the present invention, after the pair of bars constituting the joint bar are connected to each other, the first nut screwed onto the end of one bar is turned, and the end of the other bar is turned. Move it until you can press it against the edge. After that, the second nut is then turned with respect to the first nut to move the second nut in a direction that separates it from the other bar, thereby moving the one bar in a direction that separates it from the other bar. is pressed and energized.

As a result, the lock nut maintains the distance between one bar and the other bar, so no matter what direction of force is applied while using a tool, etc. to which the connecting bar is applied, one bar will remain closed. The bar moves toward the other bar, and the protrusion formed on the one bar moves along the notch formed in the other bar, and the one bar moves toward the other bar. This prevents undesirable movement relative to the material and prevents the connected state from being undesirably released.

It is an external view showing the lock structure 100 in the connecting rod 10 to which the present invention is applied. It is a sectional view showing a lock structure 100 in a connecting rod 10 to which the present invention is applied. FIG. 3 is an external view showing a connected state of the connecting rod 10 using the lock structure 100. FIG. 3 is a cross-sectional view showing a connected state of the connecting rod 10 using the lock structure 100. FIG. 2 is an external view showing a connecting structure 4 for connecting rods 1 according to the prior art. FIG. 2 is a cross-sectional view showing a connecting structure 4 for connecting rods 1 according to the prior art.

(Configuration of lock structure 100 of connecting rod 10)
A lock structure 100 according to an embodiment to which the present invention is applied will be described. FIG. 1 is an external view of a lock structure 100 in the connecting rod 10, and FIG. 2 is a cross-sectional view of the lock structure 100.

The connecting rod 10 according to this embodiment is roughly composed of a pair of rods 12 and 14 and a lock nut 50.

The bar 12 is a member for extending the length of the bar 14 to which a tool (not shown) or the like is attached to the tip thereof, and is generally composed of a bar-shaped member 16 and an end member 18.

The rod-shaped member 16 is a substantially cylindrical member, and its tip (end) is inserted into the end member 18, and its rear end (not shown) is provided with a handle (grip) for, for example, a tool. There is. Note that the shape of the rod-like member 16 is not limited to a substantially cylindrical shape; for example, it may be a prismatic member, a hollow member, or a rod-shaped member that extends toward the tip like a fishing rod. It may also have a shape that becomes thinner. Further, there are no particular restrictions on the material. Furthermore, the end member 18 is fixed to the rod-shaped member 16 with a plurality of fixing pins 17.

The end member 18 is a member into which the tip of the rod-shaped member 16 is inserted as described above, and an insertion recess 20 into which the rod-shaped member 16 is inserted is formed at one end thereof, and the insertion recess 20 into which the rod-shaped member 16 is inserted is formed at the other end. The portion is formed to have a smaller diameter than the one end portion, and is provided with a pair of substantially cylindrical protrusions 22 protruding from the circumferential side. Furthermore, a bar-side male thread 24 is formed on the outer circumferential surface of the end member 18 at approximately the center thereof. Further, a biasing member insertion hole 70 is formed in the end surface of the end member 18, and a biasing member 72 is fitted into the biasing member insertion hole 70 so as to be freely retractable. Further, a biasing spring 74 is provided inside the biasing member 72 . Thereby, the biasing member 72 is biased in the direction of protruding from the end surface of the end member 18.

In this embodiment, each of the pair of protrusions 22 has a substantially cylindrical tip and a protrusion male thread 26 formed at the rear end on the opposite side. Then, the protrusion male screw 26 is screwed into the protrusion arranging female thread 28 formed on the circumferential side of the end member 18, so that the protrusion 22 is disposed on the circumferential side of the end member 18. There is. Further, a locking screw 78 is screwed into a locking screw hole 76 formed in the end surface of the end member 18, and the tip of the locking screw 78 comes into contact with the male protrusion 26, thereby causing the male screw of the protrusion to tighten. 26 is rotated to prevent the protrusion 22 from undesirably coming off. Alternatively, the entire end member 18 including the protrusion 22 may be formed integrally.

Furthermore, although a pair of protrusions 22 are formed in this embodiment, the number of protrusions 22 may be one, or may be three or more.

As described above, the bar 14 is a long member to which a tool (not shown) is attached to its tip, and is generally composed of a bar-shaped member 30 and an end member 32.

The rod-shaped member 30 is a substantially cylindrical elongated member like the rod-shaped member 16 described above, and as described above, a tool or the like is attached to the tip (not shown), and the rear end (end) is inserted into the end member 32. Note that the shape of the rod-shaped member 30 is not limited to a substantially cylindrical shape like the rod-shaped member 16 described above, and may be, for example, a prismatic member or a hollow member. , or may have a shape that tapers toward the tip like a fishing rod. Further, there are no particular restrictions on the material. Furthermore, the end member 32 is fixed to the rod-shaped member 30 with a plurality of fixing pins 31.

The end member 32 is a member into which the rear end of the rod-shaped member 30 is inserted, as described above, and into which the other narrow end of the end member 18 of the rod 12 is inserted. A material insertion recess 34 is formed, and an insertion recess 36 into which the rod-shaped member 30 is inserted is formed at the other end.

Further, on the circumferential side of one end of the end member 32 constituting the bar insertion recess 34, there is a substantially L-shaped notch into which the protrusion 22 is fitted when the end member 18 of the bar 12 is accommodated. A portion 38 is formed. The number of notches 38 is the same as the number of protrusions 22 (two in this embodiment), and one end of each notch reaches the rear edge of the end member 32 of the bar 14, and from this one end the bar is A longitudinal section 40 extending toward the center of the bar 14, a circumferential section 42 extending from the other end of the longitudinal section 40 in a substantially circumferential direction of the bar 14, and a section opposite the longitudinal section 40 in the circumferential section 42. The housing portion 44 extends from the side end toward the rear end edge of the bar 14.

The lock nut 50 includes a first nut 52 and a second nut 54.

The first nut 52 has a first female thread 56 formed on its inner surface that engages with the bar-side male thread 24 formed on the end member 18 of the bar 12, and a first male thread 58 on its outer surface. It is formed. Further, a flange portion 60 is formed at the end edge of the first nut 52 on the bar 14 side.

The second nut 54 has a second female thread 62 formed on its inner surface that engages with the first male thread 58 of the first nut 52 .

In this embodiment, a lock structure 100 is configured by the lock nut 50, the end member 18 of the bar 12, and the end member 32 of the bar 14.

(Procedure for connecting connecting rod 10 using lock structure 100)
Next, a procedure for connecting the connecting rod 10 using the lock structure 100 according to the present embodiment will be described. First, the end member 18 is attached to the tip of the rod-shaped member 16 to form the bar 12, and similarly, the end member 32 is attached to the rear end of the rod-shaped member 30 to form the bar 14.

After that, insert the tip of the bar 12 (the tip of the end member 18) into the bar insertion recess 34 formed at the rear end of the bar 14 (the rear end of the end member 32). 34, against the urging force from the urging member 72 that is in contact with the bottom surface of 34. At this time, the protrusion 22 formed on the bar 12 moves while being fitted into the longitudinal portion 40 of the notch 38 formed on the bar 14.

After inserting the tip of the bar 12 into the bar insertion recess 34 until the protrusion 22 reaches the circumferential portion 42 of the notch 38, insert the tip of the bar 12 into the bar 14 about the longitudinal center axis of the bar 12. The bar 12 is rotated against it. At this time, the protrusion 22 moves while fitting into the circumferential portion 42 of the notch 38.

A direction in which the bar 12 is separated from the bar 14 by the urging force from the urging member 72 after the bar 12 is rotated relative to the bar 14 until the protrusion 22 reaches the accommodating part 44 of the notch 38 Return it to just a little bit. As a result, the protrusion 22 is completely accommodated in the accommodating portion 44 of the notch 38.

Next, while maintaining the positional relationship between the bar 12 and the bar 14, the first nut 52 constituting the lock nut 50 is rotated relative to the bar 12, and the flange portion 60 of the first nut 52 is rotated. The first nut 52 is moved toward the bar 14 until its outer surface abuts the rear end surface of the bar 14 (end member 32). At this time, the second nut 54 also moves toward the bar 14 together with the first nut 52 .

Thereafter, as shown in FIGS. 3 and 4, the first nut 52 is maintained in a state in which the outer surface of the flange portion 60 of the first nut 52 is in contact with the rear end surface of the bar 14 (end member 32). The second nut 54 is rotated until the rear end surface of the second nut 54 comes into contact with the stepped portion 64 formed between the tip and the center of the end member 18 of the bar 12. 54 is moved toward the rear end of the bar 12.

When the second nut 54 is moved until the rear end surface of the second nut 54 comes into contact with the stepped portion 64, the procedure for connecting the connecting rod 10 using the lock structure 100 is completed.

(Characteristics of lock structure 100 according to this embodiment)
According to the lock structure 100 according to the present embodiment, the front end surface of the flange portion 60 of the first nut 52 constituting the lock nut 50 pushes the bar 14, and in the opposite direction, the rear end surface of the second nut 54 pushes the bar 14. is adapted to push the bar 12. This restricts the movement of the bar 12 in the longitudinal direction relative to the bar 14, so that the protrusion 22 formed on the bar 12 accommodates the notch 38 formed on the bar 14. The state housed in the section 44 is maintained. Therefore, rotation of the bar 12 relative to the bar 14 is also restricted. As a result, no matter what direction of force is applied during use of a tool or the like to which the connecting rod 10 having the locking structure 100 is applied, the connection state between the rods 12 and 14 may be undesirably released. You can prevent it from being put away.

(Modification 1)
In the embodiments described above, the bar 12 and the bar 14 were composed of the bar members 16, 30 and the end members 18, 32, but instead of this, the bar 12 and the bar 14 were composed of the bar members 16, 30 and the end members 18, 32. The bar material 12 or the bar material 14 may be constructed by integrating the two materials.

(Modification 2)
Furthermore, in the embodiment described above, the tip of the bar 12 on the rear end side of the connecting rod 10 is accommodated in the rear end of the bar 14 on the tip side of the connecting rod 10. On the contrary, the rear end of the bar 14 on the front end side of the connecting rod 10 may be accommodated in the front end of the bar 12 on the rear end side of the connecting rod 10. In this case, the configuration of the end member 18 of the bar 12 and the configuration of the end member 32 of the bar 14 are reversed.

(Modification 3)
Although the flange portion 60 was formed on the first nut 52 in the embodiment described above, this flange portion 60 is not an essential configuration, and the tip surface of the first nut 52 may be formed without forming the flange portion 60. It may also be brought into contact with the rear end surface of the end member 32 of the bar 14.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

DESCRIPTION OF SYMBOLS 10... Connecting rod, 12... Bar material, 14... Bar material, 16... Bar member, 17... Fixing pin, 18... End member, 20... Insertion recess, 22... Projection, 24... Bar side male thread, 26...Protrusion male thread, 28...Protrusion installation female thread, 30...Bar member, 31...Fixing pin, 32...End member, 34...Bar insertion recess, 36...Insertion recess, 38... Notch part, 40...Longitudinal part, 42...Circumferential part, 44...Accommodating part 50...Lock nut, 52...First nut, 54...Second nut, 56...First female screw, 58...First male screw , 60... Flange portion, 62... Second female thread, 64... Step portion 70... Biasing member insertion hole, 72... Biasing member, 74... Biasing spring, 76... Rotating screw hole, 78... Rotating screw 100...Lock structure

Claims (1)

A locking structure of a connecting rod including a pair of rods and a lock nut,
The lock nut is
a first nut having a first female thread formed on the inner surface and a first male thread formed on the outer surface;
a second nut having an inner surface formed with a second female thread that engages with the first male thread;
The first female thread of the first nut is screwed into a male thread on the bar side formed at an end of one of the pair of bars,
The end of one of the rods is accommodated in the end of the other rod,
A protrusion protruding from the circumferential surface of the end of one of the bars is fitted into the circumferential surface of the other bar, and one end of the bar moves while being fitted onto the circumferential surface of the other bar. a longitudinal part extending from the one end toward the center of the other bar, a circumferential part extending from the other end of the longitudinal part in the circumferential direction of the other bar, and a circumferential part in the circumferential part. A cutout portion is formed that has a housing portion extending from an end opposite to the longitudinal portion toward a tip edge of the other bar,
A male thread on the bar side is formed on the circumferential side at the end of one of the bars,
With the protrusion accommodated in the notch, the first female screw is screwed into the male screw on the bar side in a direction in which one of the bars is separated from the other bar. A locking structure for a joint rod, wherein the end face of the first nut presses and urges the end face of the other bar, and the end face of the second nut presses and urges one of the bars.

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