Stone working – Sawing – Endless
Patent
1983-09-26
1985-10-15
Whitehead, Harold D.
Stone working
Sawing
Endless
83830, B28D 108
Patent
active
045467552
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a chain saw, preferably a so-called motor saw, which is useful in sawing concrete and similar, preferably hard, materials. Such chain saws include a motor which drives an enclosed saw-chain arranged along the edge of a saw-bar, the saw-chain comprising links, of at least some of which are fitted with at least one cutter projecting from the saw-bar.
2. The Prior Art
The known motor-saws are provided with a saw-chain consisting of three types of links which are movably arranged with respect to one another by means of pins in the same way as with known roller-chains. The links consist of saw-links provided with one or several sawteeth respectively, connecting links and control links provided with a drive and control lug extending into a guide groove which extends along the edge of the saw-bar. The saw-links and connecting links are joined in pairs, parallel and next to one another, by means of pins in such a way that each pair of links consists of a saw-link and a connecting link or two connecting links. Furthermore, the pairs of links are mutually connected by the control-links so as to form a chain.
The known saw-chain has the disadvantage that, when it is used for sawing hard materials such as, e.g., concrete, abraded wear-producing material collects in the chain gaps, which causes rapid wear of the chain's gliding surfaces, both in the actual chain and within the guide groove within the bar. Also, the drive arrangement fitted to the motor of the saw and driving the chain around the bar becomes worn, owing to the action of the abraded material.
SUMMARY OF THE INVENTION
The aim of the present invention consists in eliminating these disadvantages. The aim has been achieved by a sealing arrangement for an enclosed saw-chain arranged to move along the edge of a saw-bar and comprising links, some of which at least are provided with a cutter and some at least with a control lug, substantially located in a single plane through the saw-bar, whereby the cutter is directed outward from the bar and the control lugs are orientated inwardly towards the bar and engage a guide groove extending along the edge of the bar, with the links being movably joined with one another. The invention is characterised in that the links are entirely or partly enclosed in a seal, with the cutters and the control lugs projecting from the seal. The seal consists of an elastic, strong, and wear-resistant plastic which adheres well to the surfaces of the links and easily penetrates the spaces within the chain during its application, to which end use is made of its liquid form. The seal is also executed in such a way as to attach to the outer faces of the saw-bar. The invention prevents the abraded wear-producing material from penetrating to the gliding faces of the saw-chain, as a result of which the life of the chain increases considerably.
The invention will be better understood by reference to the attached drawing taken in conjunction with the following discussion.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an enlarged view of a part of a saw-bar seen from the side, on which a saw-chain moves along its lower edge.
FIG. 2 shows in a further enlarged form a cross-section in accordance with the line A--A in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The chain saw in accordance with the preferred embodiment of the invention comprises a motor, not shown in the figures, which drives an enclosed saw-chain that is arranged to move along the peripheral edge of a flat saw-bar 1, the saw chain comprising a series of link assemblies, each consisting of a U-shaped working link 2, the two parallel sides of which are provided with two holes arranged as a pair while at its base a cutter 5 is firmly secured and orientated away from saw-bar 1, a control link 3 provided with two holes and arranged between the sides of working link 2 on a joint pin 8 so that the other hole of control link 3 is located outside working link 2, a connecting link 4 consistin
REFERENCES:
patent: 1736607 (1929-11-01), Legge
patent: 3459169 (1969-08-01), McNulty
patent: 3587679 (1971-06-01), Conte
patent: 3741192 (1973-06-01), Avery
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