Claims
- 1. In a portable power chain saw of the straight guide bar type having a power head, a guide bar with substantially straight sides, an anti-kickback device attached to the rounded end of said guide bar for preventing kickback and a chain traveling around the guide bar to cut wood or other material on said substantially straight sides of said guide bar, a tip device for attachment to the guide bar for improving the operation and safety of said chain saw, said tip device comprising:
- a substantially flat plate rigidly attachable to the forward end of the guide bar in conjunction with said anti-kickback device without interfering with the anti-kick features of the anti-kickback device; and
- tip stabilizing means connected to said plate and responsive to the forces produced between said chain and the wood or other material being cut and the forces applied by the chain saw operator for engaging a fixed surface other than the wood or other material being cut and which is located at the forward end of said guide bar to stabilize the operation of said chain saw, said tip stabilizing means having at least one spike extending outwardly past the rounded end of the guide bar to engage the fixed surface in response to the forces between said chain and the wood or other material being cut and the forces applied by the chain saw operator during operation of said chain saw.
- 2. The tip device of claim 1 wherein said plate is positioned on the guide bar to prevent said tip device from interfering with the removal and replacement of said chain around the guide bar.
- 3. The tip device of claim 1 wherein said spike comprises at least one forward spike which extends beyond the forward end of the guide bar away from the power head to engage the fixed surface.
- 4. The tip device of claim 3 wherein the fixed surface is the ground or an adjacent log.
- 5. The tip device of claim 4 wherein the length of said spike is greater than approximately one inch
- 6. The tip device of claim 4 wherein said tip stabilzing means comprises a plurality of spikes positioned in at least two rows, each of said spikes providing at least some penetrating engagement with the fixed surface.
- 7. The tip device of claim 6 wherein the penetrating engagement is at least 3/4 of an inch when the fixed surface is the ground.
- 8. The tip device of claim 6 wherein the total cross-sectional area of said plurality of spikes is greater than a predetermined minimum cross-sectional area, said minimum cross-sectional area being established to maximize engagement of said plurality of spikes with the fixed surface during the operation of said chain saw.
- 9. The tip device of claim 8 wherein said minimum cross-sectional area is in the range of 0.10-0.40 square inches.
- 10. The tip device of claim 3 wherein said spike extends downwardly and forwardly from the longitudinal axis of the guide bar at a predetermined minimum angle, said minimum angle being established to maximize the engagement of said plurality of spikes with the fixed surface during the operation of said chain saw.
- 11. The tip device of claim 10 wherein said minimum angle is in the range of 50.degree.-80.degree..
- 12. The tip device of claim 1 wherein said tip stabilizing means includes at least one rearward spike which extends from the tip of the guide bar toward the power head to engage the fixed surface when said chain is traveling in a clockwise direction and said chain saw is being used to make an undercut.
- 13. The tip device of claim 1 wherein said tip stabilizing means includes a lateral spike which extends laterally and forward from the guide bar to engage the fixed surface by angular movement of the chain saw in relation to the plane of the guide bar independent of the direction of chain movement around the guide bar.
- 14. The tip device of claim 13 wherein the fixed surface is a tree and the wood being cut is a limb of the tree, said lateral spike engaging the surface of the tree when said chain saw is being used to perform a limbing operation.
- 15. The tip device of claim 1 wherein said tip stabilizing means includes a rearward spike which extends from the tip of the guide bar toward the power head to engage the fixed surface when said chain is traveling in a counter-clockwise direction and said chain saw is being used to make a bucking cut.
- 16. The tip device of claim 1 wherein said spike is a forward spike which extends beyond the forward end of the guide bar away from the power head to engage the fixed surface when said chain is traveling in a counterclockwise direction and said chain saw is being used to make a bucking cut, wherein said spike is engaged in the fixed surface by the forces applied by the chain saw operator.
- 17. The tip device of claim 1 wherein said plate further comprises anti-rotation means for preventing rotation of said tip device when attached to the guide bar.
- 18. The tip device of claim 1 wherein said plate further comprises attachment means for readily attaching and detaching said tip device to the forward end of the guide bar without interfering with the operation of said anti-kickback device.
- 19. The tip device of claim 18 wherein said attachment means comprises a wingnut receiving a bolt.
- 20. The tip device of claim 18 wherein said attachment means comprises a nut and washer receiving a bolt.
- 21. A portable power chain saw having a stabilized tip, said chain saw comprising:
- a power head;
- a guide bar with substantially straight sides attached to said power head;
- an anti-kickback device attached to the rounded end of said guide bar for preventing kickback;
- a chain traveling around said guide bar to cut wood or other material on said substantially straight sides of said guide bar; and
- a tip device for attachment to said guide bar for improving the operation and safety of said chain saw, said tip device including
- a substantially flat plate attached to the forward end of said guide bar in conjunction with said anti-kickback device without interfering with the anti-kickback features of said anti-kickback device and
- tip stabilizing means connected to said plate and responsive to the forces produced between said chain and the wood or other material being cut and the forces applied by the chain saw operator for engaging a fixed surface other than the wood or other material being cut and which is located at the forward end of said guide bar to stabilize the operation of said chain saw, said tip stabilizing means having at least one spike extending outwardly past the rounded end of said guide bar to engage the fixed surface in response to the forces between said chain and the wood or other material being cut and the forces applied by the chain saw operator during operation of said chain saw.
REFERENCE TO FIRST APPLICATION
This application is a continuation in part of applicants's application Ser. No. 454,641 filed Dec. 30, 1982.
US Referenced Citations (31)
Foreign Referenced Citations (3)
Number |
Date |
Country |
217880 |
Jan 1957 |
AUX |
506987 |
Nov 1954 |
CAX |
690453 |
Apr 1940 |
DE2 |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
454641 |
Dec 1982 |
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