JPH0339002Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a structure for attaching a claw to a chain for lifting or conveying a stem culm in a harvesting machine such as a binder or a combine harvester.

<Prior art> When a lifting or transporting claw is rotatably attached to a chain used for lifting or transporting stem culms in a harvesting machine such as a binder or a combine, the protruding portions of the upper and lower chain plates are used. It is known that a pin is inserted into a through hole provided in the nail through an insertion hole provided in a bulge at the proximal end of the claw.

This known method fixes the pin inserted through the insertion hole of the nail by, for example, providing a split pin between the bulge at the proximal end of the nail and the pin, or by deforming the insertion hole after the pin is inserted. I was walking over.

However, in the former case, a hole is required for inserting the cotter pin, so not only is the processing cost high and installing the cotter pin in a narrow space is troublesome, but the pawl becomes old and needs to be replaced. When the cotter pin is pulled out when this occurs, there are disadvantages such as the cotter pin breaking, mud adhering to it and making it difficult to remove, or straw debris getting wrapped around the tip of the cotter pin.

In the latter case, it is difficult to manufacture, and when replacing the claw, the deformed part of the insertion hole must be destroyed and the pin pulled out, which is a tedious task. Since it is necessary to deform the insertion hole again afterwards, there is a drawback that the claws cannot be easily replaced in the field.

<Problems to be Solved by the Invention> The present invention uses a pin to rotatably attach a claw to a chain, and allows the pin to be fixed and removed very easily.

<Means for solving the problem> The present invention has an elastically deformable bush inserted between the through holes provided in the protruding parts of the upper and lower plates of the chain, and provided in the protruding part at the proximal end of the claw. The above problem was solved by forming a spiral protrusion on the surface of the pin inserted into the bush through the insertion hole to cause elastic deformation of the bush.

<Operation> In this invention, when a pin is inserted into an elastically deformable bush inserted between through holes provided in the protrusion of the upper and lower plates of the chain through an insertion hole provided in the bulge at the proximal end of the claw, The spiral protrusion formed on the surface of the pin causes elastic deformation of the bush,
To prevent the pin from coming off by fixing the pin and the bushing.

<Example> To explain the example of the present invention with reference to the figure, the first example is
In the figures, reference numeral 1 denotes a lifting or conveying claw made of synthetic resin, and an insertion hole 3 is provided in a bulge 2 extending in the left-right direction at the base end of the claw.
On the other hand, in the chain 4, protrusions 7 having through holes 6 are provided on the plates 5, 5 at appropriate intervals, and a slit 8 provided in the vertical direction is formed between the through holes 6, 6 so that the diameter thereof is A bushing 9 that can be elastically deformed in this direction is fitted. Then, the claw 1 is made to straddle the protruding part 7 of the chain 4, and the length of the bush 9 is formed on the surface of the intermediate part of the pin 10 which is pressurized and inserted into the bush 9 through the insertion hole 3 and the through hole 6. The corresponding spiral protrusion 11 is the bush 9
By pressing or biting into the inner wall of the bushing 9 to cause elastic deformation, the inner surface of the bushing 9 is partially or completely expanded, and the bushing 9 and the pin 10 are fixed, so that the claw 1 can freely rotate around the chain 4. can be attached to.

In the embodiment described above, the outer diameter of the pin 10, the inner diameter of the bush 9, the outer diameter of the protrusion 11 of the pin 10, and the inner diameter of the insertion hole 3 are increased in this order.

Therefore, when inserting the pin 10 from the insertion hole 3 to attach the claw 1 to the chain 4, the outer diameter of the pin 10 is smaller than the inner diameter of the insertion hole 3 and the inner diameter of the bush 9, so the pin 10 can be inserted into the bush without any resistance. 9 and can hold the bush 9 between the through holes 6, 6.

Next, when the pin 10 is further inserted by driving or press-fitting, since the outer diameter of the protruding rim 11 is larger than the inner diameter of the bush 9, the ridge 11 expands through the slit 8 provided in the longitudinal direction of the bush 9. When opened, the bush 9 and pin 10 are fixed. In this case, since there is nothing between the protrusions 7, 7 that prevents the bush 9 from expanding, the expansion can be easily performed without requiring a large force.

When the pawl 1 is damaged or old and needs to be replaced, pressing the end of the pin 10 releases the fixation between the protrusion 11 and the bush 9 and pulls it out in the axial direction. , the claw 1 and the chain 4 can be separated very easily without damaging the bush 9 and pin 10.

Note that the end of the pin 10 is inserted into the insertion hole 3 as shown in the figure.
If the pins 10 do not protrude, the chain case (not shown) will be damaged, or the grain culms that are being lifted or transported will not be caught in the pins.

The bush 9 can be locked in the through hole 6 by the elasticity generated by the slit 8, but if necessary, the upper and lower ends of the bush 9 may be caulked to the periphery of the through hole 6, or the upper and lower ends of the bush 9 may be A stepped portion is provided and the stepped portion is fitted so as to abut against the periphery of the through hole 6, and the bush 9 is attached to the upper and lower plates 5,
It can also be locked between the protruding parts 7, 7 of 5.

Further, the bush 9 is not limited to one that can be elastically deformed by providing a slit 8 in the vertical direction, but may also be a hollow cylindrical one made of elastic synthetic resin. Projection 1
1 is fixed to the bush 9 by biting into the inner wall of the bush 9, so by increasing the thickness of the bush 9, the bush 9 can be prevented from slipping out from the through hole 6.

In the illustrated embodiment, insertion holes 3 are provided in the left and right bulges 2 of the claw 1, but one of the insertion holes 3 may be a blind hole. Alternatively, the claw 1 may be cantilevered along one protrusion 7 without spanning the chain 4. In this case, one end of the pin 10 is made to have a diameter larger than that of the through hole so that the claw 1 is separated from the pin 10. prevent it from slipping out.

Figure 6 is a partial view showing the upper structure of a grain culm lifting device for a combine harvester in which the claw chain of the present invention is used. A lifting chain 13 with a pawl 1 is wound around an upper driving sprocket 14 and housed in the lifting case 12, and a lifting cover 15 is attached to the front side of each lifting case 12. . The lift cover 15 does not extend to the upper end, and is designed so that it can easily and reliably remove straw debris, mud, etc. wrapped around or attached to the chain 13, sprocket 14, pawl 1, etc. at the upper end.
An open part is cut out to expose this part.

A top case 16 is formed on the back side of both lifting cases 12 in the left-right direction in which, for example, an input transmission shaft of each sprocket 14 is accommodated, and each lifting case 12 is fixed to the top case 16 with a bracket 17. . At the top of the top case 16, there is a box-shaped top cover 18 that covers the entire upper end of the lifting device including the exposed lifting case 12.
9 etc., it is attached so that it can be opened and closed in the front and rear directions,
This top cover 18 is a side surface (or side cover 20) of the drawer cover 15 and top case 16.
Bolt holes 21 are drilled at corresponding positions.
The closed state can be set using a set bolt 22 at the time of opening.

With the above mechanism, it is no longer necessary to remove or attach the top cover 18, the lifting cover, etc. each time when removing deposits or clogs on the upper part of the lifting device or performing other maintenance and inspection work, as in the conventional case.

<Effects of the invention> The present invention is a device in which a claw is rotatably attached to a chain by means of a pin inserted into an insertion hole provided in a protrusion at the base end of the claw and a through hole provided in the upper and lower chain plates. , the elastically deformable bushing interposed between the through holes is elastically deformed by a spiral protrusion formed at a suitable location on the surface of the pin, thereby fixing the pin and the bushing. To rotatably attach the nail to the chain, simply insert the pin through the insertion hole and the through hole into the elastically deformable bushing interposed between the through holes, and the pawl is rotatably fixed to the chain. . In addition, not only can the nail attachment work be done extremely easily without the need for a complicated fixing structure, but this pin has a simple structure of simply forming protrusions at appropriate locations on its surface, so it is inexpensive. be. Even if the pin and bushing are securely fixed due to the elastic deformation of the bushing, there is no risk of the pin falling off even if vibration or impact is applied to the claw or chain.

In particular, since the protrusion has a spiral shape that corresponds to the length of the bushing, it is difficult to escape in the axial direction. This has the advantage that troubles such as the ridges fitting in and damaging the fixation of the protruding ridges do not occur.

Furthermore, even when replacing the claws, the replacement is easy as all you have to do is pull out the pins from the bushings, and it can be easily done in the field.Furthermore, even if the pins are removed, there is almost no damage to the pins or bushings, so they can be replaced again. It also has the effect of being usable.

[Brief explanation of the drawing]

Fig. 1A is a partially cutaway plan view showing a state in which a bush is interposed between the through holes of the protrusion of the chain plate, Fig. 1B is a front view of the pin, and Fig. 2 is the same as above.
3 is a partially cutaway plan view showing how the pawl and chain are attached, FIG. 4 is a side view of the chain with pawl using the pin of the present invention, and FIG. 5 is the chain with pawl of the present invention. It is a partially opened perspective view of a grain culm pulling device such as a combine harvester, which is one application of the chain. 1: Claw, 3: Insertion hole, 6: Through hole, 7: Projection, 8: Slit, 9: Bush, 10: Pin,
11: Projection.

Claims (1)

[Scope of utility model registration request] In a chain for lifting or conveying a stem culm, the claw is rotatably attached to the chain by means of an insertion hole provided in the bulge at the proximal end of the claw and a through hole provided in the upper and lower chain plates. , a spiral protrusion is formed on the surface of the pin at a suitable location, and the pin is inserted under pressure into an elastically deformable bushing interposed between the through holes, and the bushing is elastically deformed to fix the pin and the bushing. A claw attachment structure in a chain for lifting or conveying stem culms, characterized by: