Patent US3910148A successfully refreshed from Google Patents.
US3910148A
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US
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Safety saw chain
Assignee: Sabre Saw Chain 1963 Ltd
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Filing: 1973-07-25
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Granted: 1975-10-07
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Expires: 1993-07-25
Abstract
Abstract This invention provides a saw chain construction in which a safety link is provided to ensure that extraneous materials are not trapped between sequentially adjacent cutting teeth. The basic structure of the saw chain includes sequential center links and pairs of side links joining the center links. Some of the pairs of side links include cutter links, such that successive cutter links are on opposite sides of the chain. A depth gauge is provided on a link of the chain disposed ahead of each cutter tooth in the direction of chain movement, and a safety link is provided ahead of each cutter tooth, the safety link constituting one of the side links of the pair immediately preceding that cutter link, and having an upstanding, sloping cam portion which terminates adjacent the depth gauge.
Inventors
- 👤 Werner Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:43
CPC Classifications
B; B27; B27B; B27B33/00; B27B33/14; B27B33/141; Y; Y10; Y10T; Y10T83/00; Y10T83/909; Y10T83/917; Y10T83/921; Y10T83/925
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
235 words
A safety saw chain comprising a plurality of center links and a plurality of pairs of side links pivotally joining said center links, certain of said pairs of side links being cutter pairs comprising a noncutting tie link on one side of the chain and a cutter link with an upstanding cutter portion on the opposite side of the chain; each cutter pair having associated therewith a depth gauge with a leading edge, said depth gauge being disposed ahead of the cutter portion integral with a link of the chain; wherein the pair of side links immediately preceding each cutter pair is a safety pair comprising a noncutting tie link on the same side of the chain as the following cutter link and a noncutting safety link on the opposite side of the chain from the following cutter link, each said safety link having a body portion and an upstanding cam portion having an upwardly and rearwardly sloping upper edge adapted to lift small diameter timber smoothly over the leading edge of said depth gauge; said cam portion terminating adjacent said depth gauge in a rearwardly projecting nose, said nose ending in a tip disposed in overlapping relationship laterally opposite the depth gauge when the chain is straight; the center of gravity of each safety link lying nearer to the center link following that safety link than to the center link preceding that safety link.
Claim 2
Dependent Claim
235 words
A safety saw chain comprising a plurality of center links and a plurality of pairs of side links pivotally joining said center links, certain of said pairs of side links being cutter pairs comprising a noncutting tie link on one side of the chain and a cutter link with an upstanding cutter portion on the opposite side of the chain; each cutter pair having associated therewith a depth gauge with a leading edge, said depth gauge being disposed ahead of the cutter portion integral with a link of the chain; wherein the pair of side links immediately preceding each cutter pair is a safety pair comprising a noncutting tie link on the same side of the chain as the following cutter link and a noncutting safety link on the opposite side of the chain from the following cutter link, each said safety link having a body portion and an upstanding cam portion having an upwardly and rearwardly sloping upper edge adapted to lift small diameter timber smoothly over the leading edge of said depth gauge; said cam portion terminating adjacent said depth gauge in a rearwardly projecting nose, said nose ending in a tip disposed in overlapping relationship laterally opposite the depth gauge when the chain is straight; the center of gravity of each safety link lying nearer to the center link following that safety link than to the center link preceding that safety link.
Claim 3
Dependent Claim
29 words
A saw chain as recited in claim 1 wherein the cam portion of the safety link is offset laterally with respect to the body portion of the safety link.
Claim 4
Dependent Claim
26 words
A saw chain as recited in claim 2 wherein the cam portion of the safety link is thinner than the body portion of the safety link.
Claim 5
Dependent Claim
29 words
A saw chain as recited in claim 1 wherein the height of the cam portion of the safety link is substantially equal to the height of the depth gauge.
Claim 6
Dependent Claim
28 words
A saw chain as recited in claim 1 wherein the height of the cam portion of the safety link is less than the height of the depth gauge.
Claim 7
Dependent Claim
18 words
A saw chain as recited in claim 1 wherein the safety link is flat and has uniform thickness.
Claim 8
Dependent Claim
234 words
A safety saw chain comprising a plurality of center links and a plurality of pairs of side links pivotally joining said center links, certain of said pairs of side links being cutter pairs comprising a non-cutting tie link on one side of the chain and a cutter link with an upstanding cutter portion on the opposite side of the chain; each cutter pair having associated therewith a depth gauge with a leading edge, said depth gauge being disposed ahead of the cutter portion integral with a link of the chain; wherein the pair of side links immediately preceding each cutter pair is a safety pair comprising a noncutting tie link on the same side of the chain as the following cutter link and a noncutting safety link on the opposite side of the chain from the following cutter link, each said safety link having a body portion and an upstanding cam portion terminating adjacent said depth gauge and having an upwardly and rearwardly sloping upper edge adapted to lift small diameter timber smoothly over the leading edge of said depth gauge; said cam portion being offset laterally outwardly with respect to the body portion of the safety link away from the cutting edge of the following cutter; the center of gravity of each safety link lying nearer to the center link following that safety link than to the center link preceding that safety link.
Claim 9
Dependent Claim
234 words
A safety saw chain comprising a plurality of center links and a plurality of pairs of side links pivotally joining said center links, certain of said pairs of side links being cutter pairs comprising a non-cutting tie link on one side of the chain and a cutter link with an upstanding cutter portion on the opposite side of the chain; each cutter pair having associated therewith a depth gauge with a leading edge, said depth gauge being disposed ahead of the cutter portion integral with a link of the chain; wherein the pair of side links immediately preceding each cutter pair is a safety pair comprising a noncutting tie link on the same side of the chain as the following cutter link and a noncutting safety link on the opposite side of the chain from the following cutter link, each said safety link having a body portion and an upstanding cam portion terminating adjacent said depth gauge and having an upwardly and rearwardly sloping upper edge adapted to lift small diameter timber smoothly over the leading edge of said depth gauge; said cam portion being offset laterally outwardly with respect to the body portion of the safety link away from the cutting edge of the following cutter; the center of gravity of each safety link lying nearer to the center link following that safety link than to the center link preceding that safety link.
Claim 10
Dependent Claim
40 words
A saw chain as recited in claim 7 wherein the body portion of the safety link is flat and has uniform thickness, and the cam portion of the safety link is thinner than the body portion of the safety link.
Claim 11
Dependent Claim
28 words
A saw chain as recited in claim 7 wherein the height of the cam portion of the safety link is less than the height of the depth gauge.
Claim 12
Dependent Claim
22 words
A saw chain as recited in claim 7 wherein the cam portion terminates adjacent the depth gauge when the chain is straight.
Claim 13
Dependent Claim
29 words
A saw chain as recited in claim 10 wherein said upwardly and rearwardly sloping upper edge is disposed immediately forward of the rearmost pivot point of the safety link.
Claim 14
Dependent Claim
29 words
A saw chain as recited in claim 7 wherein the height of the cam portion of the safety link is substantially equal to the height of the depth gauge.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |