US2308847A - Chain saw - Google Patents

Description

c. woLF CHAIN sAw Jan; 19, 1943.

Filed Sept. l0, 1958 nw/SNTDR CHARLE WOLF- meme im. 1c, 194s UNITED STATES PATENT OFFICE- zsosssiw Charles Wolf, luortland, Oreg. AApplication September 10, 1938, Serial No. 229,301

(ci. 14s- 135) ZCIaims.

The third obiectis to construct an improved form of sprocket wheel which is devoid of side walls or flanges and having no pockets in which sawdust can becomey lodged.

The fourth object is to incorporate an eilicient oiling system in the sprocket wheel itself.

The fifth object is to provide an improved form of relationship between the saw chain and the saw frame' by providing a groove within the saw chain instead of having the groove in the frame as has been ordinarily the case.

The sixth object is to construct a raker tooth whose base is greater than its pitch vfor the purpose of increasing the stability thereof and enoil retaining material I6. The rim I1 of the thickness the gage of the chain saw I am about c to describe. The outermost edges 24 of the track 22 are tangent to the circle of which the sprocket teeth faces 2i form a part. The frame I0 is secured to the track 22 by means of a clamping plate 25 and the bolts 26.

abling it to resist the klnking action which is so detrimental to block chains in general.

I vaccomplish these and other objects in the manner set forth in the following speciiication as illustrated in the accompanying drawing, in which:

Fig. i is a fragmentary elevation showing the driving end of my chain saw.

Fig. 2 is a fragmentary section taken along the line 2-2 inFig. l.

Rg. 3 is a section taken along the line 3-2 in Fig. 1.

Fig. 4 is an enlarged side elevation showing a group of cutter and raker teeth and their effect upon a straight saw guide.

Fig. 5 is a side elevation showing a simple form of the prior art chain saw.

Fig. 6 is a transverse elevation taken along the line d--B in Fig. 5.

Similar numerals refer to similar parts throughout the several views. I

.Referring in detail to the drawing, there is shown in Figs. 1 to 4, inclusive, a portiony of a frame I0 in whose bearing II journals a drive shaft I2. Any convenient means may be employed for rotating the shaft I2.

0n the reduced end I3 of the shaft I2 is keyed a sprocket wheel I4 which is provided with a reservoir I5 in which is placed a quantity'of of the sprocket teeth I9.

The chain saw itself consists of two kinds of teeth, namely, the raker links 21 and the cutter links 28 which are united by means of the pins 29. Each raker link 21 is provided with a pair of opposltely turned raker teeth 30 while its inner side 3| is curved to conform with the faces 2I The base 32 of each raker link 21 is elongated beyond the pitch center of the link 21.

The cutter links 28 are provided with projections 33 which are nearer to one end of the link 28 than they are to the other end thereof. Each projection '33 is provided with a pair of oppositely turned cutter teeth 34 whose cutting edges 35 are relatively steep while the trailing edges 36 are more sloping. 'I'he inner side 31 of each cutter link 28 is curved to conform with the exterior of the rim I1. The links 28 are used in pairs and are spaced by the raker links 21. The edges 33 of the links 28 engage the sides 20 of the teeth I as the chain passes around the sprocket wheel Il.

The raker links 21 are substantially the same width as is the track 22, that is, the bases 32 of the raker links 21 ride on the edge 24 of the track 22 while the cutter links 2B engage the sides 39 of the tinck It will be observed that the base of each raker link 21 is substantially twice as great as its pitch f I'I' are the sprocket..

example of which is shown in Figs. 5 and 6 wherein the supporting area of the tooth is substantially the same as the pitch distance and in this case the line of thrust is indicated by the dotted line 4l which forms a greater angle with relation to the line of travel of the saw than does the line 40 shown in Fig. 4.

A further advantage arising from my construction lies in the fact that it is possible to use lightweight alloys for stiifening purposes in the track base 23, and since the saw is of a portable nature, this is a decided feature in favor of this construction.

- Attention is drawn to my co-pending applica tion No. 153,361 issued July l1, 1939, as Patent No. 2,165,524 in which certain portions of this device are illustrated.

I claim:

1. In the chain saw of the class described a raker link having an elongated base adapted to ride upon a track having a high center, said base having opposite raker teeth formed thereon, said base having pin holes formed therein .between the ends thereof spaced substantially as iar apart as are said raker teeth, the opposite ends of the track engaging portion of said link being substanf tially twice as far apart as are the pin holes, each of said teeth being characterized by having a line which passes through the point of a raker tooth and the opposite end of the `track engaging portion of the link lying at an angle of less than in relation to said track.

2. A chain saw of the class described comprised of elongated'block links adapted to ride on a track, said block links having a pair of transverse connecting pins spaced approximately half the length of the track engaging portion of said block, said block having a pair of oppositely turned raker teeth thereon approximately opposite said pins and a pair of side links connecting each adjacent pair of said block links by means of said pins, each of said side links being characterized by having two oppositely turned cutter teeth formed at one end thereof, the two cutter teeth in a given pair of side links being disposed atopposite ends of said pair of side links, said chain being flexible inwardly and outwardly in the plane of the cut formed thereon, said raker teeth being stabilized and held against said track by the inward thrust of the cutter teeth directed between the track engaging ends of the block link.

v CHARLES WOLF.

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