JPH0518090Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a guide plate that guides the saw chain of a chain saw used for felling and cutting wood, etc.
In particular, it is characterized in that the saw chain tension can be adjusted automatically.

[Conventional technology]

When a chain saw is used for a long period of time, the connecting parts of the saw chain become worn out and become longer, causing the saw chain to become loose.

Therefore, the following configuration has conventionally been adopted for tension adjustment of the saw chain.

First, on the rear side of the guide plate of the saw chain, a long hole for attachment is provided along the longitudinal direction of the guide plate. On the other hand, a mounting support is provided protruding from the chain saw body. Then, in the guide plate, the mounting support is inserted into the long hole for installation, and the chain that is wound around the drive sprocket provided on the chain saw body is wound around the outer periphery of the guide plate.
The guide plate is attached to the chain saw body by tightening a guide plate fixing nut to the protruding end of the mounting column via a guide plate cover that presses and fixes the guide plate to the chain saw body.

The guide plate mounting surface of the chain saw body is provided with a groove that communicates with the front face of the chain saw body and extends in a direction that coincides with the longitudinal direction of the saw chain guide plate. On the other hand, a tension adjustment nut is attached to the guide plate so as to be located within the groove. A tension adjustment screw that engages with the tension adjustment nut is inserted into the groove from the front side of the chain saw body and screwed into the tension adjustment nut.

The head of the tension adjustment screw is hooked onto the front surface of the chain saw body so that the tension adjustment screw does not change its position even if it is turned with a screwdriver.

If the saw chain becomes loose,
First, loosen the guide plate fixing nut. Next, when the bolt is turned in the screwing direction with a screwdriver, the tension adjusting nut is forcibly moved in the direction of the head of the bolt. Here, since the tension adjustment nut is attached to the guide plate, the guide plate is also slid forward as the nut moves. When the saw chain reaches a proper tension, the tension adjustment is completed by tightening the guide plate fixing nut (see, for example, US Pat. No. 2,933,112).

[Problem that the invention attempts to solve]

However, in the conventional configuration described above, the tension adjustment screw is necessarily located close to the guide plate. Therefore, in order to rotate this, a driver must be inserted from an oblique direction, making it difficult to rotate the tension adjustment screw. That is, there is a drawback that tension adjustment of the chain is complicated and requires time and effort.

According to the guide plate of the present invention, tension adjustment can be performed automatically and quickly, and there is no need to provide a special tension adjustment device on the main body side.
The structure is simple, it can be made smaller and lighter, and it can be provided at a lower cost.

[Means for solving problems]

Insert the mounting post on the chain saw body side into the long mounting hole provided along the longitudinal direction at the rear end.
A guide plate for a chain saw, in which a nut is tightened to a protruding end of the mounting post and is fixed to the chain saw main body in a variable manner in the longitudinal direction, includes a spring member for separating the mounting post and the guide plate from each other in the longitudinal direction. It is configured to be accommodated in the long hole for attachment.

[Effect]

According to the present invention, the guide plate is always urged in the longitudinal direction away from the mounting support of the chain saw body by the spring member. In normal use of the chain saw, the biasing force is suppressed by tightening the nut to the protruding end of the mounting support.

Therefore, when the saw chain becomes loose, by loosening the nut, the guide plate is automatically slid in a direction away from the mounting column by the biasing force of the spring member.

〔Example〕

As shown in FIG. 1, the guide plate a for a chain saw generally consists of a middle plate 1, two outer plates 2 slightly larger than the middle plate 1, and a sprocket 3 provided at the tip of the middle plate 1 if necessary.

Then, the rear end portion is attached to the chain saw main body 4, and the saw chain 5 is suspended from the outer peripheral end surface thereof and the drive sprocket 6 on the side of the chain saw main body 4, and is driven.

The present invention improves the attachment part of the guide plate a to the chain saw body 4. In the drawing example,
The present invention has a mounting hole 9 that fits with a mounting column 8 on the chain saw body 4 side inside a long mounting hole 7 provided along the longitudinal direction at the rear end of the guide plate a, and a spring 10 is used to support the rear end. A configuration is shown in which a slide block 11 that is pressed is provided.

The mounting support 8 has a male thread, and a plurality of mounting posts 8 are provided for stable and reliable mounting. In the case of the drawing example, depending on the model, the mounting support 8
The slide block 11 is divided into front and rear sections so that it can be used even when the distance between the slide blocks is different. However, it is also possible to integrate them in accordance with the spacing between the mounting columns 8.

The slide block 11 is made of metal, reinforced plastics, etc., and has the mounting hole 9 on the side surface, a protrusion 11a in the upper and lower center, and lower step portions 11b on both sides.

Then, the slide block 11 is attached to both outer plates 2.
It is configured so that it is held between the mounting holes 7 and slid within the long mounting holes 7.

That is, the mounting holes 7 provided in both outer plates 2 have upper and lower protrusions 11 of the slide block 11 at their tips.
A wide width portion 7a is configured to receive the slide block 11, and its rear end direction is configured to have a width that fits the step 11b of the slide block 11.

On the other hand, the entire long mounting hole 7 provided in the middle plate 1 is attached to the upper and lower protrusions 1 of the slide block 11.
1a, and is provided with a small hole 7b that holds a guide rod 12 that guides the spring 10 toward its tip.

Next, the guide rod 12 is fixed by insertion or the like to the distal end surface of the slide block 11 provided in the distal direction, and the plurality of slide blocks 11, springs 10, and guide rods 12 are inserted into the long holes 7 and small holes for attachment of the middle plate 1. 7b, and is sandwiched between both outer plates 2 from both sides, and the middle plate 1 and both outer plates 2 are integrally constructed by spot welding, riveting, or other methods.

Reference numeral 13 in the figure is a pin that temporarily stops the sliding of the slide lock 11 by the spring 10, and the holes 14 provided in both outer plates 2 and the holes 15 provided in the upper and lower protrusions 11a of the slide block 11 are matched with each other. This makes it easier to attach the guide plate a to the chain saw body 4, and also prevents the spring 10 and guide rod 12 from coming off due to the slide block 11 sliding more than necessary before installation. It is something to do. Further, numeral 17 in the figure is a lubricating oil supply hole.

As shown in FIG. 5, the guide plate a of the present invention having the above structure is attached to a mounting post 8 provided in advance in front of the drive sprocket 6 of the chain saw body 4.

That is, the mounting support 8 is inserted into the mounting hole 9 provided in each slide block 11, and the saw chain 5 is suspended from the outer peripheral end surface of the guide plate a and the drive sprocket 6. Next, pin 1
As a result, slide block 11 and guide plate a,
Specifically, the engagement with the outer plate 2 is released, and the guide plate a is moved forward by the force of the spring 10 until the saw chain 5 is fully tensioned.

Next, a guide plate cover (not shown) having a hole into which the mounting post 8 fits is attached to the outside of the guide plate a, and the nut 16 is attached to the mounting post 8 that protrudes outside.
is tightened and fixed.

After that, if used for a long period of time, the connecting parts of the saw chain will wear out and become longer and loosen.

In that case, the present invention only requires loosening the nut 16. That is, when the nut 16 is loosened, the guide plate a is automatically moved forward by the force of the spring 10 until the saw chain 5 is fully tensioned, and then the nut 16 is screwed in and tightened to fix it. .

[Effect of idea]

According to the guide plate of the present invention, tension adjustment of the saw chain can be performed automatically and quickly, there is no need to provide a special tension adjustment device on the main body side, the structure is simple, and the size and weight can be reduced. At the same time, the effect can be obtained at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view, Fig. 2 is a front view of the main part, Fig. 3 is a partially sectional view taken along the line A-A in Fig. 2, and Fig. FIG. 4 is an exploded perspective view of the main parts, and FIG. 5 is a perspective view showing the installed state. 1...Middle plate, 2...Both outer plates, 4...Chain saw body, 7...Elongated hole for mounting, 8...Mounting support, 9...
...Mounting hole, 10... Spring, 11... Slide block, 12... Guide rod, a... Guide plate.

Claims (1)

[Claims for Utility Model Registration] A mounting post on the chain saw body side is inserted into a long mounting hole provided along the longitudinal direction at the rear end, and a nut is tightened to the protruding end of the mounting post. A guide plate for a chain saw whose position is variable in the longitudinal direction of the chain saw, characterized in that a spring member for separating the mounting support and the guide plate from each other in the longitudinal direction is accommodated in the long mounting hole. information board.