JPH0730321Y2 - Guide plate for chain saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a guide plate for a chain saw used for cutting wood.

(Prior Art) A general-purpose chain saw guide plate made of one steel plate has a considerably large weight ratio in the entire chain saw weight.

Therefore, for the purpose of reducing the weight of the chain saw, the applicant of the present invention has a plurality of bottomed recesses which are alternately hollowed out from both sides in an appropriate size in the longitudinal direction of the central portion of the guide plate at an appropriate interval. There has been proposed a guide plate that is provided and has a lightweight filler such as synthetic resin loaded in the recess.

This guide plate is advantageous in that the weight of the guide plate is reduced by removing a large amount of parts from the guide plate itself, and there is little problem in terms of strength and life in actual use.

On the other hand, the guide plate is such that the saw chain runs around the guide plate at high speed with the guide groove formed in the outer peripheral edge of the guide plate as a guide, in view of its usage. Then, the cutting tool goes out to the upper edge side and wraps around to the lower edge side at the tip of the guide plate, and the actual cutting work is performed on this lower edge side.

In general, a structure in which the chain oil for lubricating the saw chain is supplied to the upper edge side guide groove of the guide plate at the mounting base of the guide plate is generally adopted.

(Problems to be Solved by the Invention) As described above, the supply of the chain oil for lubrication to the rotation of the saw chain is performed by using the rotation of the saw chain, and the oil is supplied to the guide groove on the upper edge side of the guide plate. According to the configuration, the saw chain running toward the tip of the guide plate provides sufficient lubrication on the upper edge side of the guide plate, but when the saw chain wraps around the guide plate tip from the upper edge side to the lower edge side,
The oil may be scattered to the outside by the centrifugal force caused by the high-speed rotation of the saw chain, which puts a load on the actual cutting work, and the amount of oil that spreads to the lower edge of the guide plate where the supply of chain oil is most needed. Is decreasing.

The present invention has been made in view of the above-mentioned points, in which the chain oil is fed directly from the middle of the upper guide groove of the guide plate to the lower guide groove of the guide plate across the guide plate. An object of the present invention is to provide a guide plate for a chain saw that radiates heat of oil to the guide plate surface while passing through the plate to suppress thermal expansion of the saw chain.

(Means for Solving the Problem) The gist of the present invention for achieving the above-mentioned object is that the guide groove of the saw chain is formed on the outer peripheral edge by a single steel plate, and the longitudinal center of the plate surface is cut. In a guide plate that is lightened by providing a plurality of bottomed recesses that are hollowed out alternately from both sides in the same direction, a filler made of a highly heat-dissipating material is loaded into the bottomed recesses so that it cannot be extracted, and the filling is performed. A guide plate for a chain saw, characterized in that it has an oil supply passage that traverses the inside of the material and traverses the inside of the guide plate, and is opened at the upper edge side guide groove bottom and the lower edge side guide groove bottom.

(Operation) According to the present invention having the above configuration, the chain oil supplied to the base portion of the guide groove on the upper edge side of the guide plate flows into the oil supply passage from the middle of flowing toward the tip end portion of the guide plate by the rotation of the saw chain. , Crosses the inside of the guide plate and flows out to the guide groove on the lower edge side of the guide plate for lubrication.

The chain oil radiates the heat of the oil to the guide plate surface while passing through the filler made of a highly heat-dissipating material, and suppresses the temperature rise of each part.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an overall view of the guide plate of this invention, and Fig. 2 is Fig. 1 II.
It is an expanded sectional view in the II line.

In the figure, 1 is a guide plate made of a single steel plate, and a guide groove 2 is machined in the outer peripheral edge thereof.

Reference numeral 3 denotes a plurality of bottomed recesses which are alternately provided in the longitudinal direction in the central portion of the plate surface of the guide plate 1 so as to be hollowed out from both sides. It is loaded so that it cannot go out. As the filler 4, a resin containing copper or copper metal short fibers is used.

Reference numeral 5 denotes an oil supply passage which is provided so as to pass through the inside of the filler 4 and cross the inside of the guide plate 1 and which is opened at the upper edge side guide groove bottom and the lower edge side guide groove bottom of the guide plate 1. The chain oil is directed toward the base of the guide plate 1 so that the chain oil can easily come in and out.

(Effects of the Invention) According to the present invention having the above-described configuration, the following effects are achieved.

(1) Since the oil supply passage is provided by crossing the inside of the guide plate and opening at the bottom and upper edges of the guide plate, the chain oil flowing through the upper guide groove of the guide plate toward the tip end Lubrication is improved by positively supplying oil to the lower edge side guide groove of the guide plate from the middle. Further, it is possible to reduce the waste of oil that is scattered to the outside by centrifugal force due to the conventional high-speed running saw chain.

(2) Chain oil quickly dissipates the heat it retains while passing through the filler made of highly heat-dissipating material to the guide plate surface, lowering the temperature, so the guide plate functions as an oil cooler, and the thermal expansion of the saw chain. To improve workability by reducing the work of adjusting the tension of the saw chain during work. Further, the service life is extended by suppressing the temperature rise of the saw chain and the guide plate.

(3) Since the guide plate is provided with a hollow with a bottom,
In the processing (perforation) of the oil supply passage that traverses the inside of the thin plate-shaped guide plate, it is possible to perform the processing easily without the need for forming a small-diameter deep hole in the guide plate body, and it is possible to provide a high-performance guide plate at a low cost.

[Brief description of drawings]

FIG. 1 is an overall view of this device, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1 ... Guide plate, 2 ... Guide groove, 3 ... Recessed bottom, 4 ...
Filling material, 5 ... Oil supply passage.

Claims (1)

[Scope of utility model registration request] 1. Lightening by forming a guide groove of a saw chain on the outer peripheral edge of a single steel plate, and providing a plurality of recessed bottomed recesses alternately from both sides in the longitudinal direction of the central portion of the plate surface. In the guide plate described above, a filling material made of a highly heat-dissipating material is non-extractably loaded into the bottomed concave portion, traverses the guide plate through the filling material, and the upper edge side of the guide plate and the lower groove side A guide plate for a chain saw, which is provided with an oil supply passage opened at the bottom of the guide groove.