US1598853A - Chain saw - Google Patents

Description

Sept. 7 1926.

J. DAW

CHAIN SAW Original Filed Sept. 11, 1924 PIC-1".

NVENTOR a t x Patented Sept. 7, 1926.

UNITED STATES PATEN OFFICE.

JOSEPH DAW, or QUEBEC, QUEBEC, CANADA, ASSIGNOR TO BROWN COMPANY, or BERLIN, NEW HAMPSHIRE.

CHAIN SAW.

' August 5, 1925.

lhe invention relates to a chain saw as.

described in the present specification and illustrated in the accompanying drawings that form part.- of the same.

The. invention consists essentially of the novel features of construction pointed out broadly and specifically in the claims for novelty following a description in detail'ot an acceptable form of the invention.

The objectsof the invention are to facilitate the felling of trees particularly those of the smaller diameter used in the manufacture of paper stock; to insure eelerity and etliciency; to enable the workman to pass from tree to tree and thus cover large areas of timber in a comparatively short period in respect to other methods of felling: to sim 'ilify the inechanisn'i in such devices and therebv reduce the cost of maintenance and avoid delays in the matter of effecting repairs; to furnish a readily'portable saw for various purposes such as for metal and stone cutting and other industrial or domestic work, and generally to provide a serviceable and durable saw easy to operate and effective in its work.

In the drawings Figure 1 is a plan view of the assembled mechanism.

Figure 2 is a detail showing an enlarged fragmentary detail of the saw.

Figure 3 is a cross sectional View of the chain saw on the line 33 in Figure 1.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawings the saw cutting teeth are preferably formed in detached sets, each set being shown as having the projecting aligning lugs 13 and 14 from the one end and the bevelled aligning slots 15 and 16 at the other end in opposite sides.

The blade section 11 is reduced in thickness at the upper end 17 and these reduced ends form the arc-shaped driving teeth 18, which are intended to be engaged by corresponding sprocket wheels.

The chain sections 17 are formed with the link slots 19 and 20 from the ends respectively, these slots being part circular and cut away at the edges 21 and having flaring open ends 22.

The link bars 23 forming the joint members in connecting the several units to make Divided and this application filed Serial No. 48,405.

an endless chain are inserted in the slots 1.9 and 20 of ditferent unitsand the enlarged rounded ends 2t and 25 of said bars which are slightly grooved in the centre of their peripheries and trimmed at the edges, are forced into the convexly walled slots 19 and 20, to hold the links and chain sections flexibly together.

It will now be seen that the endless chain formed by the blade sections presents an outer cutting edge for the complete length of the chain and a toothed back forming an operating back also for the complete length of the chain on the inner side.

In the operation of this saw it will thus be seen that when it is being driven the sections of the chain saw will always be maintained in constant alignment by the aligning lugs 13 and 14. It will also be seen that when one of the chain sect-ions has been broken it can very easily be changed and thus very little time is lost in both the cutting and the repairing operations.

hat I claim is 1. In a power saw, a portable frame containing a gear and sprocket driving mechanism, and a chain saw mounted in said frame and having backs to the teeth engaging said sprocket mechanism and links joining the teeth members through disk ends slightly grooved to fit in the teeth.

2. In a power saw, a portable frame containing a gear and sprocket driving mechanism, and a chain saw mounted in said frame and having sections formed on the outside with cutting teeth, aligning slots and lugs, link bearing slots having flaring outer ends and bar links having enlarged ends bearing said link.

3. In a power saw, a portable frame containing a gear and sprocket driving mechanism, and a chain saw mounted in said frame and having linked and centrally slotted sections with cutting teeth on the one side and driving teeth on the other and engaged by said sprocket mechanism, said links joining the teeth members through disk ends grooved and coacting with convex walls in said slots.

4. In a power saw, a portable frame containing a gear and sprocket driving mechanism and a chain saw mounted in said frame and comprisingsectional saw pieces and links mounted in part circular slots therein and joining the teeth members through disk ends in convex and concave joints.

5. In a power saw, a portable frame containing a gear and sprocket driving mechanism, and a chain saw in said frame and formed of teeth sections having link bearing slots extending inwardly from each end and bevelled at the edges and teeth projecting from the backs, and links joining the teeth members through disk ends in convex and concave joints.

6. In a power saw, a portable frame containing a gear and sprocket drivin mechanism, a chain saw mounted 1n said frame and con'iprising cutting teeth on the one side and sprocket teeth on the other and links joining the teeth members through disk ends in convex and concave oints.

7. In a power saw, a portable frame containin a gear and sprocket driving mechanism, a chain saw mounted in said frame and comprising a plurality of saw members, each member having aligning projections and slots adapted to maintain the adjoining sections flush with one another, and

links joining the teeth members through disk ends in tongued and grooved joints.

. 8. In a power saw, a portable frame con-' taining a gear and sprocket driving mechanism, a chain mounted in said frame and comprising a luralit of saw members, each member liaving bevelled lugs flush with the face at one side and bevelled slots atthe otherside for the lugs from an ad joini'ng member to bring the faces of the neighboring member flush and ri id one with the other, and links joining t e teeth members through disk ends in tongued and grooved joints.

9. In a power saw, a portable frame containing a gear and sprocket driving mechanism, a chain saw mounted in said frame and comprising a plurality of saw members having their backs of reduced thickness and forming a projecting tooth, a follower bar of the same thickness as the saw members and having a slot receiving said tooth and links joining the teeth members through disk ends in tongued and grooved oints.

Signed at Quebec this 20th day of March JOSEPH DAW.

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