Structure for Casehardening a Fixture of a Guide Plate of a Chain Saw

Abstract

A structure for casehardening a fixture of a guide plate of a chain saw is disclosed and comprises: a metal member being larger than the guide plate and having a slot, the dimension between the two edges of the slot being a sum of the dimension of the outer figure of the guide plate and the dimension of a tolerance, the tolerance being defined as an allowable electrode discharging distance; and at least one cooling structure being disposed around one of the edges utmostly and only having one inlet and one outlet, other useless opens being sealed by sealing structures.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention generally relates to a structure for casehardening a fixture of a guide plate of a chain saw, more particularly to a metal fixture having the features of simpler manufacturing, precise dimensions, longer life, and easier casehardening.[0003]2. Description of the Prior Art[0004]With reference to FIG. 1, which illustrates a schematic 3-D view of a chain saw in prior arts. A chain saw 10 mainly includes a power portion 11, a chain 12 and a guide plate 13; wherein the power portion 11 is wrapped by a case 14 with a handle 15. The guide plate 13 is to guide the chain 12. Due to that the friction of the guiding plate 13 and the chain 12, the hardness and tenacity of the guide plate 13 should comply with requirements in order to prevent the guide plate 13 is damaged by the chain 12.[0005]With reference to FIG. 2, which illustrates a schematic plane view of a machine to casehardening the guide plate of the...

AI Technical Summary

Benefits of technology

[0013]The primary objective of the present invention is to provide a structure for casehardening a fixture of a guide plate of a chain saw. Since the contact surface of the guide plate is to guide the chain of the chain saw, therefore the contact surface should be promoted in hardness and tenacity thereof. On the other hand, procedures to make a fixture may involve forming the external figure of the guide plate, controlling the precision, etc., and the cost is relatively higher. The present invention adopts a whole metal member larger than the guide plate of the chain saw, and a slot of the metal member is thus easily and precisely machined. The dimension between the two edges of the slot is a sum of the dimension of the outer figure of the guide plate and the dimension of a tolerance. A cooling structure is disposed around one of the edges utmostly and only has one inlet and one outlet, other useless opens being sealed by sealing structures, wherein the inlet and the outlet of the cooling structure are for ice water or lower temperature gas coming in and going out in order to lower down the temperature of the fixture and prevent melting or breaking the fixture. Therefore, the fixture will be formed precisely and easily.

[0015]1. The prior arts needs to prepare the copper tube in advance, and the figure of the copper tube shall be special, such as non-round tube, and therefore the cost is relatively higher. The present invention adopts the whole metal member to form the slot and the cooling structure by machining, and the accuracy is easily controlled, the manufacture is simple to make the cost down.

[0016]2. The distance (gap) between the guide plate and the copper tube in prior arts is difficult to be kept in a static state, so that the plurality of block gages and adjusting screws may be necessary, but the adjustment takes time and to equalize all the adjusting screws is hard. The present invention uses the whole metal member, which is added a tolerance whine in machining, so that to dispose the guide plate will be very accurate because of the tolerance. Then the pre-process to high frequency induction can be finished rapidly.

Problems solved by technology

It seems that the whole procedures are complicate, plus that to adjust the adjusting screws may take time, to equalize all the adjusting screws may be difficult, and to adjust the arc portion of the copper tube may hardly be done as well.

On the other hand, procedures to make a fixture may involve forming the external figure of the guide plate, controlling the precision, etc., and the cost is relatively higher.

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