US870712A - Drag-saw. - Google Patents

Description

. No. 870,712. PATENTED NOV. 12, 1907.

' D. ROAMPBBLL.

DRAG SAW.

APPLICATION FILED JANkfifi. 1907.

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No. 870,712. PATENTED NOV. 12, 1907. D. P. CAMPBELL.

DRAG SAW.

APPLICATION FILED my 26. 1907.

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citizen of the United States, and resident of Eureka,

DANIEL FRASER CAMPBELL, OF EUREKA, CALIFORNIA.

DRAG-SAW.

Specification of Letters Patent.

Patented Nov. 12, 1907.

Application filed January 26,1907. Serial No. 354,266.

To all whom it may concern.-

Be it known that I, DANIEL FRASER CAMPBELL, a

in the county of Humboldt and State of California, have invented certain new and useful Improvements in Drag-Saws, of which thefollowing is a full, clear, and exact description, such as will enable those skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

The invention relates to improvements in drag-saws of that description in which the blade is reciprocated by power driven mechanism mounted on an adjustable supporting frame.

It has for its object the provision of means for imparting a rocking motion to the blade so that the latter pivots on the central part of the log being sawed and cuts in the far side of the kerf in its forward movement and in the near side on the return stroke. In this way the saw-operates to a better advantage to clear the kerf of sawdust than it would with the teeth engaging the wood the entire length of the kerf during both the forward and return strokes.

The invention also has for its object the provision of means for adjusting the saw so that it can be properly positioned relative to the log and also means for securing the machine after it has been placed.

The invention consists in the novel construction, combination and arrangement of parts, such as will be hereinafter fully described, pointedout in the appended claims and illustrated in the accompanying drawings.

In the drawings, in which similar reference characters designate corresponding parts, Figure 1 is a plan view of a machine embodying the invention. Fig. 2 is a front elevation. Fig. 3 is a side elevation.

To the opposite members of the bifurcated frame 1 are secured the shoes 2 on which the machine is piopelled. At the open end of the frame is mounted the axle-3 on which are journaled the wheels 4. When the machine is in operative position these wheels rest on the ground and with the axle form a pivot on which the saw can be adjusted. Between the sides of the frame 1 is pivoted the forked trail 5 with its apex extending beneath the free end of the frame. To the apex of the trail is hinged the lower end of the screw 6 engaging at its upper end with the nut 7 seated in the free end of the frame. When the machine is in operative position the outer end of the trail rests on the ground and by turning the nut 7 the frame can be adjusted on its pivot to the required position.

On the main frame 1 near its pivoted end are mounted the arches 8 on the crowns of which is journaled the Shaft 9 having the crank-arm 10. The shaft is rotated by the pulley 11 driven by any suitable source of power. On the shaft on opposite sides of the crankai'm are the eccentric disks 12 in the same relative position on the shaft. On each disk is a strap 13 having lugs 14 on opposite sides. Secured to the lugs of each strap by the bolts 15 is the tubular guide 16. The tubular guides are connected at their outer ends by the cross-piece 17. Movable in the tubular guides are the guide-rods 18 connected at their outer ends to the saw 19. The latter is connected by the pitman 20 with the crank-arm 10 and is reciprocated by the rotation of the shaft 9. The eccentric disks are arranged so that they raise the tubular guides during the forward movement of the saw and lower them during the return stroke. The guide-rods 18 moving in the tubular guides 16 impart a rocking motion to the saw while the machine is in operation. The saw pivots on the central part of the log and during its forward movement cuts in the far side of the kerf and on its return stroke cuts in the near side of the kerf. This causes the teeth, to clear the saw-dust from the opposite sides of the kerf without dragging it the entire length of the I cut as they would should they engage the wood during the entire length of each stroke.

On the main frame 1 and the arches 8 are the eyes 21 to engage the rods 22. The engaging end of each rod is a compound curve, as at 23, to hold against both a pull and a thrust. On the outer ends of the rods are the dogs 24 adapted to be driven into the wood that is to be sawed. The rod 22 at the front end of the machine is connected by the hook 25 with the upright 26 to hold themachine against wabbling. By means of the rods and dogs the machine can be anchored in place after it has been positioned and adjusted.

Having thus described my invention, what I claim and desire to secure by Letters Patent is,

1. In a dragsaw, a pivoted bifurcated frame, a forked trail pivoted at its open end between the members of said frame, means for relatively adjusting said frame and said trail, and a reciprocativc saw blade mounted on said frame.

2. In a drag saw, a pivoted bifurcated frame, a forked trail pivoted at its open end between the members of said frame, a nut carried by said frame, a screw hinged to said trail and engaging said nut, and a reciprocative saw blade carried by said frame.

3. In a drag-saw, a saw blade, means for reciprocating said blade, a rotatable shaft, an eccentric disk on said shaft, a tubular guide attached to said disk, and a guide rod movable in said tubular guide and connected with said blade.

4. In a drag-saw, a rotatable shaft, 21 crank-arm on said shaft, a saw, a pitman connecting said saw with said cranlHu-m, an eccentric disk on said shaft, a tubular guide connected with said disk, and a guide-rod movable in said tubular guide and connected with said saw.

5. In a drag-saw, a pivoted frame, a trail pivoted to said frame, means for relatively adjusting said frame and said trail, a rotatable shaft on said frame, an'eccentric disks on said shaft on opposite sides of the crank, tubular 10 disk on said shaft, a tubular guide connected With said guides connected with said disks, and guide-rods movable disk, a guide-rod movable in said tubular guide, a saw in said tubular guides and connected with said blade.

blade attached to said guide-rod, and means for reciprocat- In testimony whereof I hereunto afiix my signature in ing said blade. the presence of two Witnesses.

6. In a drag-saw, a pivoted bifurcated frame, arches DANIEL FRASER CAMPBELL. mounted on the members of said frame, a crank-shaft jour- Witnesses naled on the crowns of said arches, a saw blade, a pitman A. C. Non,

connecting the crank of the shaft with said blade, eccentric D. W. HANSON.

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