Stone working – Sawing – Endless
Patent
1988-08-23
1990-01-30
Schmidt, Fredrick R.
Stone working
Sawing
Endless
301234, 30382, 30383, B28D 108
Patent
active
048966487
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to a guide rail and link chain for a chain saw used for finishing work on concrete, stone and masonry and in particular to a guide rail having coolant channels.
2. Description of the Prior Art
One such link chain for a chain saw is known from the German Publication DE No. 3,332,051 A1. Here, the guide rail, also called the "sword", is provided on the lengthwise side with additional rails of metal. The guide rail is designed hollow. The hollow space serves as a channel for coolant, and on the side surfaces of the additional rails, coolant channels are arranged. The respective link chain consists of rollers, supported on pegs which are joined with each other by guide and connecting members. The rollers run on the outer surfaces of the additional rails, and the chain is turned, at the front end of the guide rail, over a chain wheel. The guide members of the chain are fastened to the cutting plates set with diamonds, which serve as cutting tools.
Although the chain can be constantly fed through the guide rail with coolant and lubricant, such guide rail and link chain systems have high wear and a short life. The dust from the cutting plates and that from the cut, settle on the additional rails, the guide members and the rollers which wears these metal parts away to the point of destruction. The cutting dust also penetrates between all the sliding surfaces, and the allowable clearance between the parts is very quickly exceeded through wear. Since such chains are very expensive, they cannot be economically used because of the rapid wear. The frequent replacement of chains necessary, and the interruption of operation cause high operation costs also.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a guide rail and link chain system, which has a long useful life, in which the wear between the chain members and the guide members is low, which has high security against disturbances, and which is simple to produce.
This problem is solved through the features defined in the distinguished part of claim 1. Further advantages of the invention are given according to the features of the dependent claims.
The guide rail and link chain system according to the invention, has a much greater life than the known chain saws. This is attained by the fact that the guide rail of the chain saw has on both lengthwise sides, slide rails of plastic, on which metal slide elements of the chain slide. The slide rails are laid into grooves located on the lengthwise sides of the guide rail and are made of plastic material with high resistance to dust of abrasion and to water. Since the coolant channels extend through the central portion of the slide rails, the cooling and lubricating fluid comes out of the middle of slide surface. In this way, the cutting and grinding dust is rinsed away from the zone of the slide surface, and between the slide rails and the slide elements of the chain, a fluid film is formed, which prevents wear of the metal chain members against the slide rails.
The links in the chain are completely shielded from the outside environment, and grinding and cutting dust cannot penetrate into the links. This is assured, on the one hand, by the fact that the sliding surfaces of the links are covered on all sides, and on the other hand, by lubricant from the center of the link which is consistently pressed over all the sliding surfaces toward the outside. Water-resistant greases with additives, such as molybdenum and other known additives are suitable as lubricants. In the contact zone of the sliding surfaces between the slide elements and the slide rails, the pressure of the coolant provides that only slight amounts of lubricant come out of the sliding surfaces between the guide members and the slide elements. In this way, the loss of lubricant is slight and the links can be relubricated within the normal interruptions of work. With regular lubrication of the chain and feeding of sufficient coolant through the guide rail, the guid
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Desai Shirish
Gamma Stawag AG
Schmidt Fredrick R.
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